/**************************************************************************
* files.c -- This file is part of GNU nano. *
* *
* Copyright (C) 1999-2011, 2013-2017 Free Software Foundation, Inc. *
* Copyright (C) 2015, 2016 Benno Schulenberg *
* *
* GNU nano is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published *
* by the Free Software Foundation, either version 3 of the License, *
* or (at your option) any later version. *
* *
* GNU nano is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty *
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. *
* See the GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program. If not, see http://www.gnu.org/licenses/. *
* *
**************************************************************************/
#include "proto.h"
#include <errno.h>
#include <fcntl.h>
#include <libgen.h>
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#include <string.h>
#include <unistd.h>
#define LOCKBUFSIZE 8192
/* Verify that the containing directory of the given filename exists. */
bool has_valid_path(const char *filename)
{
char *namecopy = mallocstrcpy(NULL, filename);
char *parentdir = dirname(namecopy);
struct stat parentinfo;
bool validity = FALSE;
if (stat(parentdir, &parentinfo) == -1) {
if (errno == ENOENT)
statusline(ALERT, _("Directory '%s' does not exist"), parentdir);
else
statusline(ALERT, _("Path '%s': %s"), parentdir, strerror(errno));
} else if (!S_ISDIR(parentinfo.st_mode))
statusline(ALERT, _("Path '%s' is not a directory"), parentdir);
else if (access(parentdir, X_OK) == -1)
statusline(ALERT, _("Path '%s' is not accessible"), parentdir);
else if (ISSET(LOCKING) && access(parentdir, W_OK) == -1)
statusline(MILD, _("Directory '%s' is not writable"), parentdir);
else
validity = TRUE;
free(namecopy);
return validity;
}
/* Add an item to the circular list of openfile structs. */
void make_new_buffer(void)
{
openfilestruct *newnode = make_new_opennode();
if (openfile == NULL) {
/* Make the first open file the only element in the list. */
newnode->prev = newnode;
newnode->next = newnode;
} else {
/* Add the new open file after the current one in the list. */
newnode->prev = openfile;
newnode->next = openfile->next;
openfile->next->prev = newnode;
openfile->next = newnode;
/* There is more than one file open: show "Close" in help lines. */
exitfunc->desc = close_tag;
}
/* Make the new buffer the current one, and start initializing it. */
openfile = newnode;
openfile->filename = mallocstrcpy(NULL, "");
initialize_buffer_text();
openfile->placewewant = 0;
openfile->current_y = 0;
openfile->modified = FALSE;
#ifndef NANO_TINY
openfile->mark_set = FALSE;
openfile->mark_begin = NULL;
openfile->mark_begin_x = 0;
openfile->kind_of_mark = SOFTMARK;
openfile->fmt = NIX_FILE;
openfile->undotop = NULL;
openfile->current_undo = NULL;
openfile->last_action = OTHER;
openfile->current_stat = NULL;
openfile->lock_filename = NULL;
#endif
#ifndef DISABLE_COLOR
openfile->syntax = NULL;
openfile->colorstrings = NULL;
#endif
}
/* Initialize the text and pointers of the current openfile struct. */
void initialize_buffer_text(void)
{
openfile->fileage = make_new_node(NULL);
openfile->fileage->data = mallocstrcpy(NULL, "");
openfile->filebot = openfile->fileage;
openfile->edittop = openfile->fileage;
openfile->current = openfile->fileage;
openfile->firstcolumn = 0;
openfile->current_x = 0;
openfile->totsize = 0;
}
/* Mark the current file as modified if it isn't already, and then
* update the titlebar to display the file's new status. */
void set_modified(void)
{
if (openfile->modified)
return;
openfile->modified = TRUE;
titlebar(NULL);
#ifndef NANO_TINY
if (!ISSET(LOCKING) || openfile->filename[0] == '\0')
return;
if (openfile->lock_filename != NULL) {
char *fullname = get_full_path(openfile->filename);
write_lockfile(openfile->lock_filename, fullname, TRUE);
free(fullname);
}
#endif
}
#ifndef NANO_TINY
/* Actually write the lockfile. This function will ALWAYS annihilate
* any previous version of the file. We'll borrow INSECURE_BACKUP here
* to decide about lockfile paranoia here as well...
*
* Args:
* lockfilename: file name for lock
* origfilename: name of the file the lock is for
* modified: whether to set the modified bit in the file
*
* Returns 1 on success, and 0 on failure (but continue anyway). */
int write_lockfile(const char *lockfilename, const char *origfilename, bool modified)
{
#ifdef HAVE_PWD_H
int cflags, fd;
FILE *filestream;
pid_t mypid;
uid_t myuid;
struct passwd *mypwuid;
struct stat fileinfo;
char *lockdata = charalloc(1024);
char myhostname[32];
size_t lockdatalen = 1024;
size_t wroteamt;
mypid = getpid();
myuid = geteuid();
/* First run things that might fail before blowing away the old state. */
if ((mypwuid = getpwuid(myuid)) == NULL) {
/* TRANSLATORS: Keep the next eight messages at most 76 characters. */
statusline(MILD, _("Couldn't determine my identity for lock file "
"(getpwuid() failed)"));
goto free_the_data;
}
if (gethostname(myhostname, 31) < 0) {
if (errno == ENAMETOOLONG)
myhostname[31] = '\0';
else {
statusline(MILD, _("Couldn't determine hostname for lock file: %s"),
strerror(errno));
goto free_the_data;
}
}
/* If the lockfile exists, try to delete it. */
if (stat(lockfilename, &fileinfo) != -1)
if (delete_lockfile(lockfilename) < 0)
goto free_the_data;
if (ISSET(INSECURE_BACKUP))
cflags = O_WRONLY | O_CREAT | O_APPEND;
else
cflags = O_WRONLY | O_CREAT | O_EXCL | O_APPEND;
/* Try to create the lockfile. */
fd = open(lockfilename, cflags,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
if (fd < 0) {
statusline(MILD, _("Error writing lock file %s: %s"),
lockfilename, strerror(errno));
goto free_the_data;
}
/* Try to associate a stream with the now open lockfile. */
filestream = fdopen(fd, "wb");
if (filestream == NULL) {
statusline(MILD, _("Error writing lock file %s: %s"), lockfilename,
strerror(errno));
goto free_the_data;
}
/* This is the lock data we will store:
*
* byte 0 - 0x62
* byte 1 - 0x30
* bytes 2-12 - program name which created the lock
* bytes 24-27 - PID (little endian) of creator process
* bytes 28-44 - username of who created the lock
* bytes 68-100 - hostname of where the lock was created
* bytes 108-876 - filename the lock is for
* byte 1007 - 0x55 if file is modified
*
* Looks like VIM also stores undo state in this file, so we're
* gonna have to figure out how to slap a 'OMG don't use recover on
* our lockfile' message in here...
*
* This is likely very wrong, so this is a WIP. */
memset(lockdata, 0, lockdatalen);
lockdata[0] = 0x62;
lockdata[1] = 0x30;
lockdata[24] = mypid % 256;
lockdata[25] = (mypid / 256) % 256;
lockdata[26] = (mypid / (256 * 256)) % 256;
lockdata[27] = mypid / (256 * 256 * 256);
snprintf(&lockdata[2], 11, "nano %s", VERSION);
strncpy(&lockdata[28], mypwuid->pw_name, 16);
strncpy(&lockdata[68], myhostname, 31);
if (origfilename != NULL)
strncpy(&lockdata[108], origfilename, 768);
if (modified == TRUE)
lockdata[1007] = 0x55;
wroteamt = fwrite(lockdata, sizeof(char), lockdatalen, filestream);
if (wroteamt < lockdatalen) {
statusline(MILD, _("Error writing lock file %s: %s"),
lockfilename, ferror(filestream));
goto free_the_data;
}
#ifdef DEBUG
fprintf(stderr, "In write_lockfile(), write successful (wrote %lu bytes)\n", (unsigned long)wroteamt);
#endif
if (fclose(filestream) == EOF) {
statusline(MILD, _("Error writing lock file %s: %s"),
lockfilename, strerror(errno));
goto free_the_data;
}
openfile->lock_filename = (char *) lockfilename;
free(lockdata);
return 1;
free_the_data:
free(lockdata);
return 0;
#else
return 1;
#endif
}
/* Delete the lockfile. Return -1 if unsuccessful, and 1 otherwise. */
int delete_lockfile(const char *lockfilename)
{
if (unlink(lockfilename) < 0 && errno != ENOENT) {
statusline(MILD, _("Error deleting lock file %s: %s"), lockfilename,
strerror(errno));
return -1;
}
return 1;
}
/* Deal with lockfiles. Return -1 on refusing to override the lockfile,
* and 1 on successfully creating it; 0 means we were not successful in
* creating the lockfile but we should continue to load the file. */
int do_lockfile(const char *filename)
{
char *namecopy = (char *) mallocstrcpy(NULL, filename);
char *secondcopy = (char *) mallocstrcpy(NULL, filename);
size_t locknamesize = strlen(filename) + strlen(locking_prefix)
+ strlen(locking_suffix) + 3;
char *lockfilename = charalloc(locknamesize);
static char lockprog[11], lockuser[17];
struct stat fileinfo;
int lockfd, lockpid, retval = -1;
snprintf(lockfilename, locknamesize, "%s/%s%s%s", dirname(namecopy),
locking_prefix, basename(secondcopy), locking_suffix);
free(secondcopy);
#ifdef DEBUG
fprintf(stderr, "lock file name is %s\n", lockfilename);
#endif
if (stat(lockfilename, &fileinfo) != -1) {
size_t readtot = 0;
size_t readamt = 0;
char *lockbuf, *question, *pidstring, *postedname, *promptstr;
int room, response;
if ((lockfd = open(lockfilename, O_RDONLY)) < 0) {
statusline(MILD, _("Error opening lock file %s: %s"),
lockfilename, strerror(errno));
goto free_the_name;
}
lockbuf = charalloc(LOCKBUFSIZE);
do {
readamt = read(lockfd, &lockbuf[readtot], LOCKBUFSIZE - readtot);
readtot += readamt;
} while (readamt > 0 && readtot < LOCKBUFSIZE);
close(lockfd);
if (readtot < 48) {
statusline(MILD, _("Error reading lock file %s: "
"Not enough data read"), lockfilename);
free(lockbuf);
goto free_the_name;
}
strncpy(lockprog, &lockbuf[2], 10);
lockpid = (((unsigned char)lockbuf[27] * 256 + (unsigned char)lockbuf[26]) * 256 +
(unsigned char)lockbuf[25]) * 256 + (unsigned char)lockbuf[24];
strncpy(lockuser, &lockbuf[28], 16);
free(lockbuf);
pidstring = charalloc(11);
sprintf (pidstring, "%u", (unsigned int)lockpid);
#ifdef DEBUG
fprintf(stderr, "lockpid = %d\n", lockpid);
fprintf(stderr, "program name which created this lock file should be %s\n", lockprog);
fprintf(stderr, "user which created this lock file should be %s\n", lockuser);
#endif
/* TRANSLATORS: The second %s is the name of the user, the third that of the editor. */
question = _("File %s is being edited (by %s with %s, PID %s); continue?");
room = COLS - strlenpt(question) + 7 - strlenpt(lockuser) -
strlenpt(lockprog) - strlenpt(pidstring);
if (room < 4)
postedname = mallocstrcpy(NULL, "_");
else if (room < strlenpt(filename)) {
char *fragment = display_string(filename,
strlenpt(filename) - room + 3, room, FALSE);
postedname = charalloc(strlen(fragment) + 4);
strcpy(postedname, "...");
strcat(postedname, fragment);
free(fragment);
} else
postedname = mallocstrcpy(NULL, filename);
/* Allow extra space for username (14), program name (8), PID (8),
* and terminating \0 (1), minus the %s (2) for the file name. */
promptstr = charalloc(strlen(question) + 29 + strlen(postedname));
sprintf(promptstr, question, postedname, lockuser, lockprog, pidstring);
free(postedname);
free(pidstring);
response = do_yesno_prompt(FALSE, promptstr);
free(promptstr);
if (response < 1) {
blank_statusbar();
goto free_the_name;
}
}
retval = write_lockfile(lockfilename, filename, FALSE);
free_the_name:
free(namecopy);
if (retval < 1)
free(lockfilename);
return retval;
}
/* Perform a stat call on the given filename, allocating a stat struct
* if necessary. On success, *pstat points to the stat's result. On
* failure, *pstat is freed and made NULL. */
void stat_with_alloc(const char *filename, struct stat **pstat)
{
if (*pstat == NULL)
*pstat = (struct stat *)nmalloc(sizeof(struct stat));
if (stat(filename, *pstat) != 0) {
free(*pstat);
*pstat = NULL;
}
}
#endif /* !NANO_TINY */
/* This does one of three things. If the filename is "", just create a new
* empty buffer. Otherwise, read the given file into the existing buffer,
* or into a new buffer when MULTIBUFFER is set or there is no buffer yet. */
bool open_buffer(const char *filename, bool undoable)
{
bool new_buffer = (openfile == NULL || ISSET(MULTIBUFFER));
/* Whether we load into the current buffer or a new one. */
char *realname;
/* The filename after tilde expansion. */
FILE *f;
int rc;
/* rc == -2 means that we have a new file. -1 means that the
* open() failed. 0 means that the open() succeeded. */
/* Display newlines in filenames as ^J. */
as_an_at = FALSE;
#ifndef DISABLE_OPERATINGDIR
if (check_operating_dir(filename, FALSE)) {
statusline(ALERT, _("Can't insert file from outside of %s"),
full_operating_dir);
return FALSE;
}
#endif
realname = real_dir_from_tilde(filename);
/* When the specified filename is not empty, and the corresponding
* file exists, verify that it is a normal file. */
if (strcmp(filename, "") != 0) {
struct stat fileinfo;
if (stat(realname, &fileinfo) == 0 && !S_ISREG(fileinfo.st_mode)) {
if (S_ISDIR(fileinfo.st_mode))
statusline(ALERT, _("\"%s\" is a directory"), realname);
else
statusline(ALERT, _("\"%s\" is not a normal file"), realname);
free(realname);
return FALSE;
}
}
/* If we're going to load into a new buffer, first create the new
* buffer and (if possible) lock the corresponding file. */
if (new_buffer) {
make_new_buffer();
if (!inhelp && has_valid_path(realname)) {
#ifndef NANO_TINY
if (ISSET(LOCKING) && filename[0] != '\0') {
/* When not overriding an existing lock, discard the buffer. */
if (do_lockfile(realname) < 0) {
#ifdef ENABLE_MULTIBUFFER
close_buffer();
#endif
free(realname);
return FALSE;
}
}
#endif /* !NANO_TINY */
}
}
/* If the filename isn't blank, and we are not in NOREAD_MODE,
* open the file. Otherwise, treat it as a new file. */
rc = (filename[0] != '\0' && !ISSET(NOREAD_MODE)) ?
open_file(realname, new_buffer, inhelp, &f) : -2;
/* If we have a file, and we're loading into a new buffer, update
* the filename. */
if (rc != -1 && new_buffer)
openfile->filename = mallocstrcpy(openfile->filename, realname);
/* If we have a non-new file, read it in. Then, if the buffer has
* no stat, update the stat, if applicable. */
if (rc > 0) {
read_file(f, rc, realname, undoable, new_buffer);
#ifndef NANO_TINY
if (openfile->current_stat == NULL)
stat_with_alloc(realname, &openfile->current_stat);
#endif
}
/* If we have a file, and we're loading into a new buffer, move back
* to the beginning of the first line of the buffer. */
if (rc != -1 && new_buffer) {
openfile->current = openfile->fileage;
openfile->current_x = 0;
openfile->placewewant = 0;
}
#ifndef DISABLE_COLOR
/* If we're loading into a new buffer, update the colors to account
* for it, if applicable. */
if (new_buffer)
color_update();
#endif
free(realname);
return TRUE;
}
#ifndef DISABLE_SPELLER
/* Open the specified file, and if that succeeds, blow away the text of
* the current buffer and read the file contents into its place. */
void replace_buffer(const char *filename)
{
FILE *f;
int descriptor;
/* Open the file quietly. */
descriptor = open_file(filename, FALSE, TRUE, &f);
/* If opening failed, forget it. */
if (descriptor < 0)
return;
/* Reinitialize the text of the current buffer. */
free_filestruct(openfile->fileage);
initialize_buffer_text();
/* Insert the processed file into its place. */
read_file(f, descriptor, filename, FALSE, TRUE);
/* Put current at a place that is certain to exist. */
openfile->current = openfile->fileage;
}
#ifndef NANO_TINY
/* Open the specified file, and if that succeeds, blow away the text of
* the current buffer at the given coordinates and read the file
* contents into its place. */
void replace_marked_buffer(const char *filename, filestruct *top, size_t top_x,
filestruct *bot, size_t bot_x)
{
FILE *f;
int descriptor;
bool old_no_newlines = ISSET(NO_NEWLINES);
filestruct *trash_top = NULL;
filestruct *trash_bot = NULL;
descriptor = open_file(filename, FALSE, TRUE, &f);
if (descriptor < 0)
return;
/* Don't add a magicline when replacing text in the buffer. */
SET(NO_NEWLINES);
/* Throw away the text under the mark, and insert the processed file
* where the marked text was. */
extract_buffer(&trash_top, &trash_bot, top, top_x, bot, bot_x);
free_filestruct(trash_top);
read_file(f, descriptor, filename, FALSE, TRUE);
/* Restore the magicline behavior now that we're done fiddling. */
if (!old_no_newlines)
UNSET(NO_NEWLINES);
}
#endif /* !NANO_TINY */
#endif /* !DISABLE_SPELLER */
/* Update the titlebar and the multiline cache to match the current buffer. */
void prepare_for_display(void)
{
/* Update the titlebar, since the filename may have changed. */
if (!inhelp)
titlebar(NULL);
#ifndef DISABLE_COLOR
/* If there are multiline coloring regexes, and there is no
* multiline cache data yet, precalculate it now. */
if (openfile->syntax && openfile->syntax->nmultis > 0 &&
openfile->fileage->multidata == NULL)
precalc_multicolorinfo();
have_palette = FALSE;
#endif
refresh_needed = TRUE;
}
#ifdef ENABLE_MULTIBUFFER
/* Switch to a neighbouring file buffer; to the next if to_next is TRUE;
* otherwise, to the previous one. */
void switch_to_prevnext_buffer(bool to_next)
{
/* If only one file buffer is open, say so and get out. */
if (openfile == openfile->next && !inhelp) {
statusbar(_("No more open file buffers"));
return;
}
/* Switch to the next or previous file buffer. */
openfile = to_next ? openfile->next : openfile->prev;
#ifdef DEBUG
fprintf(stderr, "filename is %s\n", openfile->filename);
#endif
#ifndef NANO_TINY
/* When not in softwrap mode, make sure firstcolumn is zero. It might
* be nonzero if we had softwrap mode on while in this buffer, and then
* turned softwrap mode off while in a different buffer. */
if (!ISSET(SOFTWRAP))
openfile->firstcolumn = 0;
#endif
/* Update titlebar and multiline info to match the current buffer. */
prepare_for_display();
if (inhelp)
return;
/* Ensure that the main loop will redraw the help lines. */
currmenu = MMOST;
/* Indicate the switch on the statusbar. */
statusline(HUSH, _("Switched to %s"),
((openfile->filename[0] == '\0') ?
_("New Buffer") : openfile->filename));
#ifdef DEBUG
dump_filestruct(openfile->current);
#endif
}
/* Switch to the previous entry in the openfile filebuffer. */
void switch_to_prev_buffer_void(void)
{
switch_to_prevnext_buffer(FALSE);
}
/* Switch to the next entry in the openfile filebuffer. */
void switch_to_next_buffer_void(void)
{
switch_to_prevnext_buffer(TRUE);
}
/* Delete an entry from the circular list of open files, and switch to the
* one after it. Return TRUE on success, and FALSE if there are no other
* open buffers. */
bool close_buffer(void)
{
/* If only one file buffer is open, get out. */
if (openfile == openfile->next)
return FALSE;
#ifndef DISABLE_HISTORIES
if (ISSET(POS_HISTORY))
update_poshistory(openfile->filename,
openfile->current->lineno, xplustabs() + 1);
#endif
/* Switch to the next file buffer. */
switch_to_prevnext_buffer(TRUE);
/* Close the file buffer we had open before. */
unlink_opennode(openfile->prev);
/* If now just one buffer remains open, show "Exit" in the help lines. */
if (openfile == openfile->next)
exitfunc->desc = exit_tag;
return TRUE;
}
#endif /* ENABLE_MULTIBUFFER */
/* Do a quick permissions check by verifying whether the file is appendable.
* Err on the side of permissiveness (reporting TRUE when it might be wrong)
* to not fluster users editing on odd filesystems by printing incorrect
* warnings. */
int is_file_writable(const char *filename)
{
struct stat fileinfo, fileinfo2;
int fd;
FILE *f;
char *full_filename;
bool result = TRUE;
if (ISSET(VIEW_MODE))
return TRUE;
/* Get the specified file's full path. */
full_filename = get_full_path(filename);
/* Okay, if we can't stat the absolute path due to some component's
* permissions, just try the relative one. */
if (full_filename == NULL ||
(stat(full_filename, &fileinfo) == -1 && stat(filename, &fileinfo2) != -1))
full_filename = mallocstrcpy(NULL, filename);
if ((fd = open(full_filename, O_WRONLY | O_CREAT | O_APPEND, S_IRUSR |
S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH)) == -1 ||
(f = fdopen(fd, "a")) == NULL)
result = FALSE;
else
fclose(f);
close(fd);
free(full_filename);
return result;
}
/* Encode any NUL bytes in the given line of text, which is of length buf_len,
* and return a dynamically allocated copy of the resultant string. */
char *encode_data(char *buf, size_t buf_len)
{
unsunder(buf, buf_len);
buf[buf_len] = '\0';
return mallocstrcpy(NULL, buf);
}
/* Read an open file into the current buffer. f should be set to the
* open file, and filename should be set to the name of the file.
* undoable means do we want to create undo records to try and undo
* this. Will also attempt to check file writability if fd > 0 and
* checkwritable == TRUE. */
void read_file(FILE *f, int fd, const char *filename, bool undoable,
bool checkwritable)
{
ssize_t was_lineno = openfile->current->lineno;
/* The line number where we start the insertion. */
size_t was_leftedge = 0;
/* The leftedge where we start the insertion. */
size_t num_lines = 0;
/* The number of lines in the file. */
size_t len = 0;
/* The length of the current line of the file. */
char input = '\0';
/* The current input character. */
char *buf;
/* The buffer in which we assemble each line of the file. */
size_t bufx = MAX_BUF_SIZE;
/* The allocated size of the line buffer; increased as needed. */
filestruct *topline;
/* The top of the new buffer where we store the read file. */
filestruct *bottomline;
/* The bottom of the new buffer. */
int input_int;
/* The current value we read from the file, whether an input
* character or EOF. */
bool writable = TRUE;
/* Whether the file is writable (in case we care). */
#ifndef NANO_TINY
int format = 0;
/* 0 = *nix, 1 = DOS, 2 = Mac, 3 = both DOS and Mac. */
#endif
buf = charalloc(bufx);
#ifndef NANO_TINY
if (undoable)
add_undo(INSERT);
if (ISSET(SOFTWRAP))
was_leftedge = leftedge_for(xplustabs(), openfile->current);
#endif
/* Create an empty buffer. */
topline = make_new_node(NULL);
bottomline = topline;
/* Read the entire file into the new buffer. */
while ((input_int = getc(f)) != EOF) {
input = (char)input_int;
/* If it's a *nix file ("\n") or a DOS file ("\r\n"), and file
* conversion isn't disabled, handle it! */
if (input == '\n') {
#ifndef NANO_TINY
/* If it's a DOS file or a DOS/Mac file ('\r' before '\n' on
* the first line if we think it's a *nix file, or on any
* line otherwise), and file conversion isn't disabled,
* handle it! */
if ((num_lines == 0 || format != 0) && !ISSET(NO_CONVERT) &&
len > 0 && buf[len - 1] == '\r') {
if (format == 0 || format == 2)
format++;
}
/* If it's a Mac file ('\r' without '\n' on the first line if we
* think it's a *nix file, or on any line otherwise), and file
* conversion isn't disabled, handle it! */
} else if ((num_lines == 0 || format != 0) && !ISSET(NO_CONVERT) &&
len > 0 && buf[len - 1] == '\r') {
/* If we currently think the file is a *nix file, set format
* to Mac. If we currently think the file is a DOS file,
* set format to both DOS and Mac. */
if (format == 0 || format == 1)
format += 2;
#endif
} else {
/* Store the character. */
buf[len] = input;
/* Keep track of the total length of the line. It might have
* nulls in it, so we can't just use strlen() later. */
len++;
/* If needed, increase the buffer size, MAX_BUF_SIZE characters at
* a time. Don't bother decreasing it; it is freed at the end. */
if (len == bufx) {
bufx += MAX_BUF_SIZE;
buf = charealloc(buf, bufx);
}
continue;
}
#ifndef NANO_TINY
/* If it's a DOS or Mac line, strip the '\r' from it. */
if (len > 0 && buf[len - 1] == '\r' && !ISSET(NO_CONVERT))
buf[--len] = '\0';
#endif
/* Store the data and make a new line. */
bottomline->data = encode_data(buf, len);
bottomline->next = make_new_node(bottomline);
bottomline = bottomline->next;
num_lines++;
/* Reset the length in preparation for the next line. */
len = 0;
#ifndef NANO_TINY
/* If it happens to be a Mac line, store the character after the \r
* as the first character of the next line. */
if (input != '\n')
buf[len++] = input;
#endif
}
/* Perhaps this could use some better handling. */
if (ferror(f))
nperror(filename);
fclose(f);
if (fd > 0 && checkwritable) {
close(fd);
writable = is_file_writable(filename);
}
/* If the file ended with newline, or it was entirely empty, make the
* last line blank. Otherwise, put the last read data in. */
if (len == 0)
bottomline->data = mallocstrcpy(NULL, "");
else {
bool mac_line_needs_newline = FALSE;
#ifndef NANO_TINY
/* If the final character is '\r', and file conversion isn't disabled,
* set format to Mac if we currently think the file is a *nix file, or
* to DOS-and-Mac if we currently think it is a DOS file. */
if (buf[len - 1] == '\r' && !ISSET(NO_CONVERT)) {
if (format < 2)
format += 2;
/* Strip the carriage return. */
buf[--len] = '\0';
/* Indicate we need to put a blank line in after this one. */
mac_line_needs_newline = TRUE;
}
#endif
/* Store the data of the final line. */
bottomline->data = encode_data(buf, len);
num_lines++;
if (mac_line_needs_newline) {
bottomline->next = make_new_node(bottomline);
bottomline = bottomline->next;
bottomline->data = mallocstrcpy(NULL, "");
}
}
free(buf);
/* Insert the just read buffer into the current one. */
ingraft_buffer(topline);
/* Set the desired x position at the end of what was inserted. */
openfile->placewewant = xplustabs();
/* If we've read a help file, don't give any feedback. */
if (inhelp)
return;
if (!writable)
statusline(ALERT, _("File '%s' is unwritable"), filename);
#ifndef NANO_TINY
else if (format == 3) {
/* TRANSLATORS: Keep the next four messages at most 78 characters. */
statusline(HUSH, P_("Read %lu line (Converted from DOS and Mac format)",
"Read %lu lines (Converted from DOS and Mac format)",
(unsigned long)num_lines), (unsigned long)num_lines);
} else if (format == 2) {
openfile->fmt = MAC_FILE;
statusline(HUSH, P_("Read %lu line (Converted from Mac format)",
"Read %lu lines (Converted from Mac format)",
(unsigned long)num_lines), (unsigned long)num_lines);
} else if (format == 1) {
openfile->fmt = DOS_FILE;
statusline(HUSH, P_("Read %lu line (Converted from DOS format)",
"Read %lu lines (Converted from DOS format)",
(unsigned long)num_lines), (unsigned long)num_lines);
}
#endif
else
statusline(HUSH, P_("Read %lu line", "Read %lu lines",
(unsigned long)num_lines), (unsigned long)num_lines);
/* If we inserted less than a screenful, don't center the cursor. */
if (undoable && less_than_a_screenful(was_lineno, was_leftedge))
focusing = FALSE;
#ifndef NANO_TINY
if (undoable)
update_undo(INSERT);
if (ISSET(MAKE_IT_UNIX))
openfile->fmt = NIX_FILE;
#endif
}
/* Open the file with the given name. If the file does not exist, display
* "New File" if newfie is TRUE, and say "File not found" otherwise.
* Return -2 if we say "New File", -1 if the file isn't opened, and the
* obtained fd otherwise. *f is set to the opened file. */
int open_file(const char *filename, bool newfie, bool quiet, FILE **f)
{
struct stat fileinfo, fileinfo2;
int fd;
char *full_filename;
/* Get the specified file's full path. */
full_filename = get_full_path(filename);
/* Okay, if we can't stat the path due to a component's
* permissions, just try the relative one. */
if (full_filename == NULL || (stat(full_filename, &fileinfo) == -1 &&
stat(filename, &fileinfo2) != -1))
full_filename = mallocstrcpy(full_filename, filename);
if (stat(full_filename, &fileinfo) == -1) {
if (newfie) {
if (!quiet)
statusbar(_("New File"));
free(full_filename);
return -2;
}
statusline(ALERT, _("File \"%s\" not found"), filename);
free(full_filename);
return -1;
}
/* Don't open directories, character files, or block files. */
if (S_ISDIR(fileinfo.st_mode) || S_ISCHR(fileinfo.st_mode) ||
S_ISBLK(fileinfo.st_mode)) {
statusline(ALERT, S_ISDIR(fileinfo.st_mode) ?
_("\"%s\" is a directory") :
_("\"%s\" is a device file"), filename);
free(full_filename);
return -1;
}
/* Try opening the file. */
fd = open(full_filename, O_RDONLY);
if (fd == -1)
statusline(ALERT, _("Error reading %s: %s"), filename, strerror(errno));
else {
/* The file is A-OK. Associate a stream with it. */
*f = fdopen(fd, "rb");
if (*f == NULL) {
statusline(ALERT, _("Error reading %s: %s"), filename, strerror(errno));
close(fd);
} else if (!inhelp)
statusbar(_("Reading File"));
}
free(full_filename);
return fd;
}
/* This function will return the name of the first available extension
* of a filename (starting with [name][suffix], then [name][suffix].1,
* etc.). Memory is allocated for the return value. If no writable
* extension exists, we return "". */
char *get_next_filename(const char *name, const char *suffix)
{
unsigned long i = 0;
char *buf;
size_t wholenamelen;
wholenamelen = strlen(name) + strlen(suffix);
/* Reserve space for: the name plus the suffix plus a dot plus
* possibly five digits plus a null byte. */
buf = charalloc(wholenamelen + 7);
sprintf(buf, "%s%s", name, suffix);
while (TRUE) {
struct stat fs;
if (stat(buf, &fs) == -1)
return buf;
/* Limit the number of backup files to a hundred thousand. */
if (++i == 100000)
break;
sprintf(buf + wholenamelen, ".%lu", i);
}
/* There is no possible save file: blank out the filename. */
*buf = '\0';
return buf;
}
/* Insert a file into the current buffer, or into a new buffer when
* the MULTIBUFFER flag is set. */
void do_insertfile(void)
{
int i;
const char *msg;
char *given = mallocstrcpy(NULL, "");
/* The last answer the user typed at the statusbar prompt. */
#ifndef NANO_TINY
bool execute = FALSE;
#endif
/* Display newlines in filenames as ^J. */
as_an_at = FALSE;
while (TRUE) {
#ifndef NANO_TINY
if (execute) {
#ifdef ENABLE_MULTIBUFFER
if (ISSET(MULTIBUFFER))
/* TRANSLATORS: The next four messages are prompts. */
msg = _("Command to execute in new buffer");
else
#endif
msg = _("Command to execute");
} else
#endif /* NANO_TINY */
{
#ifdef ENABLE_MULTIBUFFER
if (ISSET(MULTIBUFFER))
msg = _("File to insert into new buffer [from %s]");
else
#endif
msg = _("File to insert [from %s]");
}
present_path = mallocstrcpy(present_path, "./");
i = do_prompt(TRUE, TRUE,
#ifndef NANO_TINY
execute ? MEXTCMD :
#endif
MINSERTFILE, given,
#ifndef DISABLE_HISTORIES
NULL,
#endif
edit_refresh, msg,
#ifndef DISABLE_OPERATINGDIR
operating_dir != NULL ? operating_dir :
#endif
"./");
/* If we're in multibuffer mode and the filename or command is
* blank, open a new buffer instead of canceling. */
if (i == -1 || (i == -2 && !ISSET(MULTIBUFFER))) {
statusbar(_("Cancelled"));
break;
} else {
ssize_t was_current_lineno = openfile->current->lineno;
size_t was_current_x = openfile->current_x;
#if !defined(NANO_TINY) || defined(ENABLE_BROWSER) || defined(ENABLE_MULTIBUFFER)
functionptrtype func = func_from_key(&i);
#endif
given = mallocstrcpy(given, answer);
#ifdef ENABLE_MULTIBUFFER
if (func == flip_newbuffer) {
/* Don't allow toggling when in view mode. */
if (!ISSET(VIEW_MODE))
TOGGLE(MULTIBUFFER);
else
beep();
continue;
}
#endif
#ifndef NANO_TINY
if (func == flip_execute) {
execute = !execute;
continue;
}
#endif
#ifdef ENABLE_BROWSER
if (func == to_files_void) {
char *chosen = do_browse_from(answer);
/* If no file was chosen, go back to the prompt. */
if (chosen == NULL)
continue;
free(answer);
answer = chosen;
i = 0;
}
#endif
/* If we don't have a file yet, go back to the prompt. */
if (i != 0 && (!ISSET(MULTIBUFFER) || i != -2))
continue;
#ifndef NANO_TINY
if (execute) {
#ifdef ENABLE_MULTIBUFFER
/* When in multibuffer mode, first open a blank buffer. */
if (ISSET(MULTIBUFFER))
open_buffer("", FALSE);
#endif
/* Save the command's output in the current buffer. */
execute_command(answer);
#ifdef ENABLE_MULTIBUFFER
/* If this is a new buffer, put the cursor at the top. */
if (ISSET(MULTIBUFFER)) {
openfile->current = openfile->fileage;
openfile->current_x = 0;
openfile->placewewant = 0;
set_modified();
}
#endif
} else
#endif /* !NANO_TINY */
{
/* Make sure the path to the file specified in answer is
* tilde-expanded. */
answer = free_and_assign(answer, real_dir_from_tilde(answer));
/* Save the file specified in answer in the current buffer. */
open_buffer(answer, TRUE);
}
#ifdef ENABLE_MULTIBUFFER
if (ISSET(MULTIBUFFER)) {
#ifndef DISABLE_HISTORIES
if (ISSET(POS_HISTORY)) {
ssize_t priorline, priorcol;
#ifndef NANO_TINY
if (!execute)
#endif
if (has_old_position(answer, &priorline, &priorcol))
do_gotolinecolumn(priorline, priorcol, FALSE, FALSE);
}
#endif /* !DISABLE_HISTORIES */
/* Update stuff to account for the current buffer. */
prepare_for_display();
} else
#endif /* ENABLE_MULTIBUFFER */
{
/* Mark the file as modified if it changed. */
if (openfile->current->lineno != was_current_lineno ||
openfile->current_x != was_current_x)
set_modified();
/* Set the target row for the cursor when pushed offscreen. */
openfile->current_y = editwinrows - 1;
refresh_needed = TRUE;
}
break;
}
}
free(given);
}
/* If the current mode of operation allows it, go insert a file. */
void do_insertfile_void(void)
{
if (ISSET(RESTRICTED))
show_restricted_warning();
#ifdef ENABLE_MULTIBUFFER
else if (ISSET(VIEW_MODE) && !ISSET(MULTIBUFFER))
statusbar(_("Key invalid in non-multibuffer mode"));
#endif
else
do_insertfile();
}
/* When passed "[relative path]" or "[relative path][filename]" in
* origpath, return "[full path]" or "[full path][filename]" on success,
* or NULL on error. Do this if the file doesn't exist but the relative
* path does, since the file could exist in memory but not yet on disk).
* Don't do this if the relative path doesn't exist, since we won't be
* able to go there. */
char *get_full_path(const char *origpath)
{
int attempts = 0;
/* How often we've tried climbing back up the tree. */
struct stat fileinfo;
char *currentdir, *d_here, *d_there, *d_there_file = NULL;
char *last_slash;
bool path_only;
if (origpath == NULL)
return NULL;
/* Get the current directory. If it doesn't exist, back up and try
* again until we get a directory that does, and use that as the
* current directory. */
currentdir = charalloc(PATH_MAX + 1);
d_here = getcwd(currentdir, PATH_MAX + 1);
while (d_here == NULL && attempts < 20) {
IGNORE_CALL_RESULT(chdir(".."));
d_here = getcwd(currentdir, PATH_MAX + 1);
attempts++;
}
/* If we succeeded, canonicalize it in d_here. */
if (d_here != NULL) {
/* If the current directory isn't "/", tack a slash onto the end
* of it. */
if (strcmp(d_here, "/") != 0) {
d_here = charealloc(d_here, strlen(d_here) + 2);
strcat(d_here, "/");
}
/* Otherwise, set d_here to "". */
} else {
d_here = mallocstrcpy(NULL, "");
free(currentdir);
}
d_there = real_dir_from_tilde(origpath);
/* If stat()ing d_there fails, assume that d_there refers to a new
* file that hasn't been saved to disk yet. Set path_only to TRUE
* if d_there refers to a directory, and FALSE otherwise. */
path_only = (stat(d_there, &fileinfo) != -1 && S_ISDIR(fileinfo.st_mode));
/* If path_only is TRUE, make sure d_there ends in a slash. */
if (path_only) {
size_t d_there_len = strlen(d_there);
if (d_there[d_there_len - 1] != '/') {
d_there = charealloc(d_there, d_there_len + 2);
strcat(d_there, "/");
}
}
/* Search for the last slash in d_there. */
last_slash = strrchr(d_there, '/');
/* If we didn't find one, then make sure the answer is in the format
* "d_here/d_there". */
if (last_slash == NULL) {
assert(!path_only);
d_there_file = d_there;
d_there = d_here;
} else {
/* If path_only is FALSE, then save the filename portion of the
* answer (everything after the last slash) in d_there_file. */
if (!path_only)
d_there_file = mallocstrcpy(NULL, last_slash + 1);
/* Remove the filename portion of the answer from d_there. */
*(last_slash + 1) = '\0';
/* Go to the path specified in d_there. */
if (chdir(d_there) == -1) {
free(d_there);
d_there = NULL;
} else {
free(d_there);
/* Get the full path. */
currentdir = charalloc(PATH_MAX + 1);
d_there = getcwd(currentdir, PATH_MAX + 1);
/* If we succeeded, canonicalize it in d_there. */
if (d_there != NULL) {
/* If the current directory isn't "/", tack a slash onto
* the end of it. */
if (strcmp(d_there, "/") != 0) {
d_there = charealloc(d_there, strlen(d_there) + 2);
strcat(d_there, "/");
}
/* Otherwise, make sure that we return NULL. */
} else {
path_only = TRUE;
free(currentdir);
}
/* Finally, go back to the path specified in d_here,
* where we were before. We don't check for a chdir()
* error, since we can do nothing if we get one. */
IGNORE_CALL_RESULT(chdir(d_here));
}
/* Free d_here, since we're done using it. */
free(d_here);
}
/* At this point, if path_only is FALSE and d_there isn't NULL,
* d_there contains the path portion of the answer and d_there_file
* contains the filename portion of the answer. If this is the
* case, tack the latter onto the end of the former. d_there will
* then contain the complete answer. */
if (!path_only && d_there != NULL) {
d_there = charealloc(d_there, strlen(d_there) +
strlen(d_there_file) + 1);
strcat(d_there, d_there_file);
}
/* Free d_there_file, since we're done using it. */
free(d_there_file);
return d_there;
}
/* Return the full version of path, as returned by get_full_path(). On
* error, or if path doesn't reference a directory, or if the directory
* isn't writable, return NULL. */
char *check_writable_directory(const char *path)
{
char *full_path = get_full_path(path);
if (full_path == NULL)
return NULL;
/* If we can't write to path or path isn't a directory, return NULL. */
if (access(full_path, W_OK) != 0 ||
full_path[strlen(full_path) - 1] != '/') {
free(full_path);
return NULL;
}
return full_path;
}
/* This function calls mkstemp(($TMPDIR|P_tmpdir|/tmp/)"nano.XXXXXX").
* On success, it returns the malloc()ed filename and corresponding FILE
* stream, opened in "r+b" mode. On error, it returns NULL for the
* filename and leaves the FILE stream unchanged. */
char *safe_tempfile(FILE **f)
{
char *full_tempdir = NULL;
const char *tmpdir_env;
int fd;
mode_t original_umask = 0;
/* If $TMPDIR is set, set tempdir to it, run it through
* get_full_path(), and save the result in full_tempdir. Otherwise,
* leave full_tempdir set to NULL. */
tmpdir_env = getenv("TMPDIR");
if (tmpdir_env != NULL)
full_tempdir = check_writable_directory(tmpdir_env);
/* If $TMPDIR is unset, empty, or not a writable directory, and
* full_tempdir is NULL, try P_tmpdir instead. */
if (full_tempdir == NULL)
full_tempdir = check_writable_directory(P_tmpdir);
/* if P_tmpdir is NULL, use /tmp. */
if (full_tempdir == NULL)
full_tempdir = mallocstrcpy(NULL, "/tmp/");
full_tempdir = charealloc(full_tempdir, strlen(full_tempdir) + 12);
strcat(full_tempdir, "nano.XXXXXX");
original_umask = umask(0);
umask(S_IRWXG | S_IRWXO);
fd = mkstemp(full_tempdir);
if (fd != -1)
*f = fdopen(fd, "r+b");
else {
free(full_tempdir);
full_tempdir = NULL;
}
umask(original_umask);
return full_tempdir;
}
#ifndef DISABLE_OPERATINGDIR
/* Change to the specified operating directory, when it's valid. */
void init_operating_dir(void)
{
full_operating_dir = get_full_path(operating_dir);
/* If the operating directory is inaccessible, fail. */
if (full_operating_dir == NULL || chdir(full_operating_dir) == -1)
die(_("Invalid operating directory\n"));
snuggly_fit(&full_operating_dir);
}
/* Check to see if we're inside the operating directory. Return FALSE
* if we are, or TRUE otherwise. If allow_tabcomp is TRUE, allow
* incomplete names that would be matches for the operating directory,
* so that tab completion will work. */
bool check_operating_dir(const char *currpath, bool allow_tabcomp)
{
/* full_operating_dir is global for memory cleanup. It should have
* already been initialized by init_operating_dir(). Also, a
* relative operating directory path will only be handled properly
* if this is done. */
char *fullpath;
bool retval = FALSE;
const char *whereami1, *whereami2 = NULL;
/* If no operating directory is set, don't bother doing anything. */
if (operating_dir == NULL)
return FALSE;
fullpath = get_full_path(currpath);
/* If fullpath is NULL, it means some directory in the path doesn't
* exist or is unreadable. If allow_tabcomp is FALSE, then currpath
* is what the user typed somewhere. We don't want to report a
* non-existent directory as being outside the operating directory,
* so we return FALSE. If allow_tabcomp is TRUE, then currpath
* exists, but is not executable. So we say it isn't in the
* operating directory. */
if (fullpath == NULL)
return allow_tabcomp;
whereami1 = strstr(fullpath, full_operating_dir);
if (allow_tabcomp)
whereami2 = strstr(full_operating_dir, fullpath);
/* If both searches failed, we're outside the operating directory.
* Otherwise, check the search results. If the full operating
* directory path is not at the beginning of the full current path
* (for normal usage) and vice versa (for tab completion, if we're
* allowing it), we're outside the operating directory. */
if (whereami1 != fullpath && whereami2 != full_operating_dir)
retval = TRUE;
free(fullpath);
/* Otherwise, we're still inside it. */
return retval;
}
#endif
#ifndef NANO_TINY
/* Although this sucks, it sucks less than having a single 'my system is
* messed up and I'm blanket allowing insecure file writing operations'. */
int prompt_failed_backupwrite(const char *filename)
{
static int response;
static char *prevfile = NULL; /* What was the last file we were
* passed so we don't keep asking
* this? Though maybe we should... */
if (prevfile == NULL || strcmp(filename, prevfile)) {
response = do_yesno_prompt(FALSE, _("Failed to write backup file; "
"continue saving? (Say N if unsure.) "));
prevfile = mallocstrcpy(prevfile, filename);
}
return response;
}
/* Transform the specified backup directory to an absolute path. */
void init_backup_dir(void)
{
char *full_backup_dir = get_full_path(backup_dir);
/* When we can't get an absolute path, or it's not a directory,
* cancel the making of backups. */
if (full_backup_dir == NULL ||
full_backup_dir[strlen(full_backup_dir) - 1] != '/') {
free(full_backup_dir);
free(backup_dir);
backup_dir = NULL;
} else {
free(backup_dir);
backup_dir = full_backup_dir;
snuggly_fit(&backup_dir);
}
}
#endif /* !NANO_TINY */
/* Read from inn, write to out. We assume inn is opened for reading,
* and out for writing. We return 0 on success, -1 on read error, or -2
* on write error. inn is always closed by this function, out is closed
* only if close_out is true. */
int copy_file(FILE *inn, FILE *out, bool close_out)
{
int retval = 0;
char buf[BUFSIZ];
size_t charsread;
int (*flush_out_fnc)(FILE *) = (close_out) ? fclose : fflush;
assert(inn != NULL && out != NULL && inn != out);
do {
charsread = fread(buf, sizeof(char), BUFSIZ, inn);
if (charsread == 0 && ferror(inn)) {
retval = -1;
break;
}
if (fwrite(buf, sizeof(char), charsread, out) < charsread) {
retval = -2;
break;
}
} while (charsread > 0);
if (fclose(inn) == EOF)
retval = -1;
if (flush_out_fnc(out) == EOF)
retval = -2;
return retval;
}
/* Write a file out to disk. If f_open isn't NULL, we assume that it is
* a stream associated with the file, and we don't try to open it
* ourselves. If tmp is TRUE, we set the umask to disallow anyone else
* from accessing the file, we don't set the filename to its name, and
* we don't print out how many lines we wrote on the statusbar.
*
* tmp means we are writing a temporary file in a secure fashion. We
* use it when spell checking or dumping the file on an error. If
* method is APPEND, it means we are appending instead of overwriting.
* If method is PREPEND, it means we are prepending instead of
* overwriting. If nonamechange is TRUE, we don't change the current
* filename. nonamechange is irrelevant when appending or prepending,
* or when writing a temporary file.
*
* Return TRUE on success or FALSE on error. */
bool write_file(const char *name, FILE *f_open, bool tmp,
kind_of_writing_type method, bool nonamechange)
{
bool retval = FALSE;
/* Instead of returning in this function, you should always
* set retval and then goto cleanup_and_exit. */
size_t lineswritten = 0;
const filestruct *fileptr = openfile->fileage;
int fd;
/* The file descriptor we use. */
mode_t original_umask = 0;
/* Our umask, from when nano started. */
#ifndef NANO_TINY
bool realexists;
/* The result of stat(). TRUE if the file exists, FALSE
* otherwise. If name is a link that points nowhere, realexists
* is FALSE. */
#endif
struct stat st;
/* The status fields filled in by stat(). */
char *realname;
/* The filename after tilde expansion. */
FILE *f = f_open;
/* The actual file, realname, we are writing to. */
char *tempname = NULL;
/* The name of the temporary file we write to on prepend. */
if (*name == '\0')
return -1;
if (!tmp)
titlebar(NULL);
realname = real_dir_from_tilde(name);
#ifndef DISABLE_OPERATINGDIR
/* If we're writing a temporary file, we're probably going outside
* the operating directory, so skip the operating directory test. */
if (!tmp && check_operating_dir(realname, FALSE)) {
statusline(ALERT, _("Can't write outside of %s"), full_operating_dir);
goto cleanup_and_exit;
}
#endif
/* If the temp file exists and isn't already open, give up. */
if (tmp && (lstat(realname, &st) != -1) && f_open == NULL)
goto cleanup_and_exit;
#ifndef NANO_TINY
/* Check whether the file (at the end of the symlink) exists. */
realexists = (stat(realname, &st) != -1);
/* If we haven't stat()d this file before (say, the user just
* specified it interactively), stat and save the value now,
* or else we will chase null pointers when we do modtime checks,
* preserve file times, and so on, during backup. */
if (openfile->current_stat == NULL && !tmp && realexists)
stat_with_alloc(realname, &openfile->current_stat);
/* We backup only if the backup toggle is set, the file isn't
* temporary, and the file already exists. Furthermore, if we
* aren't appending, prepending, or writing a selection, we backup
* only if the file has not been modified by someone else since nano
* opened it. */
if (ISSET(BACKUP_FILE) && !tmp && realexists && openfile->current_stat &&
(method != OVERWRITE || openfile->mark_set ||
openfile->current_stat->st_mtime == st.st_mtime)) {
int backup_fd;
FILE *backup_file;
char *backupname;
static struct timespec filetime[2];
int backup_cflags;
/* Save the original file's access and modification times. */
filetime[0].tv_sec = openfile->current_stat->st_atime;
filetime[1].tv_sec = openfile->current_stat->st_mtime;
if (f_open == NULL) {
/* Open the original file to copy to the backup. */
f = fopen(realname, "rb");
if (f == NULL) {
statusline(ALERT, _("Error reading %s: %s"), realname,
strerror(errno));
/* If we can't read from the original file, go on, since
* only saving the original file is better than saving
* nothing. */
goto skip_backup;
}
}
/* If backup_dir is set, we set backupname to
* backup_dir/backupname~[.number], where backupname is the
* canonicalized absolute pathname of realname with every '/'
* replaced with a '!'. This means that /home/foo/file is
* backed up in backup_dir/!home!foo!file~[.number]. */
if (backup_dir != NULL) {
char *backuptemp = get_full_path(realname);
if (backuptemp == NULL)
/* If get_full_path() failed, we don't have a
* canonicalized absolute pathname, so just use the
* filename portion of the pathname. We use tail() so
* that e.g. ../backupname will be backed up in
* backupdir/backupname~ instead of
* backupdir/../backupname~. */
backuptemp = mallocstrcpy(NULL, tail(realname));
else {
size_t i = 0;
for (; backuptemp[i] != '\0'; i++) {
if (backuptemp[i] == '/')
backuptemp[i] = '!';
}
}
backupname = charalloc(strlen(backup_dir) + strlen(backuptemp) + 1);
sprintf(backupname, "%s%s", backup_dir, backuptemp);
free(backuptemp);
backuptemp = get_next_filename(backupname, "~");
if (*backuptemp == '\0') {
statusline(HUSH, _("Error writing backup file %s: %s"),
backupname, _("Too many backup files?"));
free(backuptemp);
free(backupname);
/* If we can't write to the backup, DON'T go on, since
* whatever caused the backup file to fail (e.g. disk
* full may well cause the real file write to fail,
* which means we could lose both the backup and the
* original! */
goto cleanup_and_exit;
} else {
free(backupname);
backupname = backuptemp;
}
} else {
backupname = charalloc(strlen(realname) + 2);
sprintf(backupname, "%s~", realname);
}
/* First, unlink any existing backups. Next, open the backup
* file with O_CREAT and O_EXCL. If it succeeds, we have a file
* descriptor to a new backup file. */
if (unlink(backupname) < 0 && errno != ENOENT && !ISSET(INSECURE_BACKUP)) {
if (prompt_failed_backupwrite(backupname))
goto skip_backup;
statusline(HUSH, _("Error writing backup file %s: %s"),
backupname, strerror(errno));
free(backupname);
goto cleanup_and_exit;
}
if (ISSET(INSECURE_BACKUP))
backup_cflags = O_WRONLY | O_CREAT | O_APPEND;
else
backup_cflags = O_WRONLY | O_CREAT | O_EXCL | O_APPEND;
backup_fd = open(backupname, backup_cflags,
S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
/* Now we've got a safe file stream. If the previous open()
* call failed, this will return NULL. */
backup_file = fdopen(backup_fd, "wb");
if (backup_fd < 0 || backup_file == NULL) {
statusline(HUSH, _("Error writing backup file %s: %s"),
backupname, strerror(errno));
free(backupname);
/* If we can't make a backup, DON'T go on, since whatever caused
* the backup to fail (e.g. disk full) may well cause the real
* file write to fail, in which case we could lose both the
* backup and the original! */
goto cleanup_and_exit;
}
/* Only try chowning the backup when we're root. */
if (geteuid() == NANO_ROOT_UID &&
fchown(backup_fd, openfile->current_stat->st_uid,
openfile->current_stat->st_gid) == -1 &&
!ISSET(INSECURE_BACKUP)) {
fclose(backup_file);
if (prompt_failed_backupwrite(backupname))
goto skip_backup;
statusline(HUSH, _("Error writing backup file %s: %s"),
backupname, strerror(errno));
free(backupname);
goto cleanup_and_exit;
}
/* Set the backup's mode bits. */
if (fchmod(backup_fd, openfile->current_stat->st_mode) == -1 &&
!ISSET(INSECURE_BACKUP)) {
fclose(backup_file);
if (prompt_failed_backupwrite(backupname))
goto skip_backup;
statusline(HUSH, _("Error writing backup file %s: %s"),
backupname, strerror(errno));
free(backupname);
goto cleanup_and_exit;
}
#ifdef DEBUG
fprintf(stderr, "Backing up %s to %s\n", realname, backupname);
#endif
/* Copy the file. */
if (copy_file(f, backup_file, FALSE) != 0) {
fclose(backup_file);
statusline(ALERT, _("Error reading %s: %s"), realname,
strerror(errno));
goto cleanup_and_exit;
}
/* And set the backup's timestamps. */
if (futimens(backup_fd, filetime) == -1 && !ISSET(INSECURE_BACKUP)) {
fclose(backup_file);
if (prompt_failed_backupwrite(backupname))
goto skip_backup;
statusline(HUSH, _("Error writing backup file %s: %s"),
backupname, strerror(errno));
goto cleanup_and_exit;
}
fclose(backup_file);
free(backupname);
}
skip_backup:
#endif /* !NANO_TINY */
if (f_open == NULL) {
original_umask = umask(0);
/* If we create a temp file, we don't let anyone else access it.
* We create a temp file if tmp is TRUE. */
if (tmp)
umask(S_IRWXG | S_IRWXO);
else
umask(original_umask);
}
/* If we're prepending, copy the file to a temp file. */
if (method == PREPEND) {
int fd_source;
FILE *f_source = NULL;
if (f == NULL) {
f = fopen(realname, "rb");
if (f == NULL) {
statusline(ALERT, _("Error reading %s: %s"), realname,
strerror(errno));
goto cleanup_and_exit;
}
}
tempname = safe_tempfile(&f);
if (tempname == NULL) {
statusline(ALERT, _("Error writing temp file: %s"),
strerror(errno));
goto cleanup_and_exit;
}
if (f_open == NULL) {
fd_source = open(realname, O_RDONLY | O_CREAT, S_IRUSR | S_IWUSR);
if (fd_source != -1) {
f_source = fdopen(fd_source, "rb");
if (f_source == NULL) {
statusline(ALERT, _("Error reading %s: %s"), realname,
strerror(errno));
close(fd_source);
fclose(f);
unlink(tempname);
goto cleanup_and_exit;
}
}
}
if (f_source == NULL || copy_file(f_source, f, TRUE) != 0) {
statusline(ALERT, _("Error writing temp file: %s"),
strerror(errno));
unlink(tempname);
goto cleanup_and_exit;
}
}
if (f_open == NULL) {
/* Now open the file in place. Use O_EXCL if tmp is TRUE. This
* is copied from joe, because wiggy says so *shrug*. */
fd = open(realname, O_WRONLY | O_CREAT | ((method == APPEND) ?
O_APPEND : (tmp ? O_EXCL : O_TRUNC)), S_IRUSR |
S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH);
/* Set the umask back to the user's original value. */
umask(original_umask);
/* If we couldn't open the file, give up. */
if (fd == -1) {
statusline(ALERT, _("Error writing %s: %s"), realname,
strerror(errno));
if (tempname != NULL)
unlink(tempname);
goto cleanup_and_exit;
}
f = fdopen(fd, (method == APPEND) ? "ab" : "wb");
if (f == NULL) {
statusline(ALERT, _("Error writing %s: %s"), realname,
strerror(errno));
close(fd);
goto cleanup_and_exit;
}
}
while (fileptr != NULL) {
size_t data_len = strlen(fileptr->data), size;
/* Convert newlines to nulls, just before we write to disk. */
sunder(fileptr->data);
size = fwrite(fileptr->data, sizeof(char), data_len, f);
/* Convert nulls to newlines. data_len is the string's real
* length. */
unsunder(fileptr->data, data_len);
if (size < data_len) {
statusline(ALERT, _("Error writing %s: %s"), realname,
strerror(errno));
fclose(f);
goto cleanup_and_exit;
}
/* If we're on the last line of the file, don't write a newline
* character after it. If the last line of the file is blank,
* this means that zero bytes are written, in which case we
* don't count the last line in the total lines written. */
if (fileptr == openfile->filebot) {
if (fileptr->data[0] == '\0')
lineswritten--;
} else {
#ifndef NANO_TINY
if (openfile->fmt == DOS_FILE || openfile->fmt == MAC_FILE) {
if (putc('\r', f) == EOF) {
statusline(ALERT, _("Error writing %s: %s"), realname,
strerror(errno));
fclose(f);
goto cleanup_and_exit;
}
}
if (openfile->fmt != MAC_FILE)
#endif
if (putc('\n', f) == EOF) {
statusline(ALERT, _("Error writing %s: %s"), realname,
strerror(errno));
fclose(f);
goto cleanup_and_exit;
}
}
fileptr = fileptr->next;
lineswritten++;
}
/* If we're prepending, open the temp file, and append it to f. */
if (method == PREPEND) {
int fd_source;
FILE *f_source = NULL;
fd_source = open(tempname, O_RDONLY | O_CREAT, S_IRUSR | S_IWUSR);
if (fd_source != -1) {
f_source = fdopen(fd_source, "rb");
if (f_source == NULL)
close(fd_source);
}
if (f_source == NULL) {
statusline(ALERT, _("Error reading %s: %s"), tempname,
strerror(errno));
fclose(f);
goto cleanup_and_exit;
}
if (copy_file(f_source, f, TRUE) != 0) {
statusline(ALERT, _("Error writing %s: %s"), realname,
strerror(errno));
goto cleanup_and_exit;
}
unlink(tempname);
} else if (fclose(f) != 0) {
statusline(ALERT, _("Error writing %s: %s"), realname,
strerror(errno));
goto cleanup_and_exit;
}
if (method == OVERWRITE && !tmp) {
/* If we must set the filename, and it changed, adjust things. */
if (!nonamechange && strcmp(openfile->filename, realname) != 0) {
#ifndef DISABLE_COLOR
char *newname;
char *oldname = openfile->syntax ? openfile->syntax->name : "";
filestruct *line = openfile->fileage;
#endif
openfile->filename = mallocstrcpy(openfile->filename, realname);
#ifndef DISABLE_COLOR
/* See if the applicable syntax has changed. */
color_update();
color_init();
newname = openfile->syntax ? openfile->syntax->name : "";
/* If the syntax changed, discard and recompute the multidata. */
if (strcmp(oldname, newname) != 0) {
for (; line != NULL; line = line->next) {
free(line->multidata);
line->multidata = NULL;
}
precalc_multicolorinfo();
refresh_needed = TRUE;
}
#endif
}
#ifndef NANO_TINY
if (!openfile->mark_set)
/* Get or update the stat info to reflect the current state. */
stat_with_alloc(realname, &openfile->current_stat);
#endif
statusline(HUSH, P_("Wrote %lu line", "Wrote %lu lines",
(unsigned long)lineswritten), (unsigned long)lineswritten);
openfile->modified = FALSE;
titlebar(NULL);
}
retval = TRUE;
cleanup_and_exit:
free(realname);
free(tempname);
return retval;
}
#ifndef NANO_TINY
/* Write a marked selection from a file out to disk. Return TRUE on
* success or FALSE on error. */
bool write_marked_file(const char *name, FILE *f_open, bool tmp,
kind_of_writing_type method)
{
bool retval;
bool old_modified = openfile->modified;
/* Save the status, because write_file() unsets the modified flag. */
bool added_magicline = FALSE;
/* Whether we added a magicline after filebot. */
filestruct *top, *bot;
size_t top_x, bot_x;
/* Partition the buffer so that it contains only the marked text. */
mark_order((const filestruct **)&top, &top_x,
(const filestruct **)&bot, &bot_x, NULL);
filepart = partition_filestruct(top, top_x, bot, bot_x);
/* If we are doing magicline, and the last line of the partition
* isn't blank, then add a newline at the end of the buffer. */
if (!ISSET(NO_NEWLINES) && openfile->filebot->data[0] != '\0') {
new_magicline();
added_magicline = TRUE;
}
retval = write_file(name, f_open, tmp, method, TRUE);
/* If we added a magicline, remove it now. */
if (added_magicline)
remove_magicline();
/* Unpartition the buffer so that it contains all the text again. */
unpartition_filestruct(&filepart);
if (old_modified)
set_modified();
return retval;
}
#endif /* !NANO_TINY */
/* Write the current file to disk. If the mark is on, write the current
* marked selection to disk. If exiting is TRUE, write the entire file
* to disk regardless of whether the mark is on, and without prompting if
* the TEMP_FILE flag is set and the current file has a name. Return 0
* on error, 1 on success, and 2 when the buffer is to be discarded. */
int do_writeout(bool exiting)
{
int i;
bool result = FALSE;
kind_of_writing_type method = OVERWRITE;
char *given;
/* The filename we offer, or what the user typed so far. */
bool maychange = (openfile->filename[0] == '\0');
/* Whether it's okay to save the file under a different name. */
#ifndef DISABLE_EXTRA
static bool did_credits = FALSE;
#endif
/* Display newlines in filenames as ^J. */
as_an_at = FALSE;
if (exiting && ISSET(TEMP_FILE) && openfile->filename[0] != '\0') {
if (write_file(openfile->filename, NULL, FALSE, OVERWRITE, FALSE))
return 1;
/* If writing the file failed, go on to prompt for a new name. */
}
given = mallocstrcpy(NULL,
#ifndef NANO_TINY
(openfile->mark_set && !exiting) ? "" :
#endif
openfile->filename);
while (TRUE) {
const char *msg;
#ifndef NANO_TINY
const char *formatstr, *backupstr;
formatstr = (openfile->fmt == DOS_FILE) ? _(" [DOS Format]") :
(openfile->fmt == MAC_FILE) ? _(" [Mac Format]") : "";
backupstr = ISSET(BACKUP_FILE) ? _(" [Backup]") : "";
/* If we're using restricted mode, don't display the "Write
* Selection to File" prompt. This function is disabled, since
* it allows reading from or writing to files not specified on
* the command line. */
if (openfile->mark_set && !exiting && !ISSET(RESTRICTED))
/* TRANSLATORS: The next six strings are prompts. */
msg = (method == PREPEND) ? _("Prepend Selection to File") :
(method == APPEND) ? _("Append Selection to File") :
_("Write Selection to File");
else if (method != OVERWRITE)
msg = (method == PREPEND) ? _("File Name to Prepend to") :
_("File Name to Append to");
else
#endif /* !NANO_TINY */
msg = _("File Name to Write");
present_path = mallocstrcpy(present_path, "./");
/* If we're using restricted mode, and the filename isn't blank,
* disable tab completion. */
i = do_prompt(!ISSET(RESTRICTED) || openfile->filename[0] == '\0',
TRUE, MWRITEFILE, given,
#ifndef DISABLE_HISTORIES
NULL,
#endif
edit_refresh, "%s%s%s", msg,
#ifndef NANO_TINY
formatstr, backupstr
#else
"", ""
#endif
);
if (i < 0) {
statusbar(_("Cancelled"));
break;
} else {
functionptrtype func = func_from_key(&i);
/* Upon request, abandon the buffer. */
if (func == discard_buffer) {
free(given);
return 2;
}
given = mallocstrcpy(given, answer);
#ifdef ENABLE_BROWSER
if (func == to_files_void) {
char *chosen = do_browse_from(answer);
if (chosen == NULL)
continue;
/* We have a file now. Indicate this. */
free(answer);
answer = chosen;
} else
#endif
#ifndef NANO_TINY
if (func == dos_format_void) {
openfile->fmt = (openfile->fmt == DOS_FILE) ? NIX_FILE :
DOS_FILE;
continue;
} else if (func == mac_format_void) {
openfile->fmt = (openfile->fmt == MAC_FILE) ? NIX_FILE :
MAC_FILE;
continue;
} else if (func == backup_file_void) {
TOGGLE(BACKUP_FILE);
continue;
} else if (func == prepend_void) {
method = (method == PREPEND) ? OVERWRITE : PREPEND;
continue;
} else if (func == append_void) {
method = (method == APPEND) ? OVERWRITE : APPEND;
continue;
} else
#endif /* !NANO_TINY */
if (func == do_help_void) {
continue;
}
#ifdef DEBUG
fprintf(stderr, "filename is %s\n", answer);
#endif
#ifndef DISABLE_EXTRA
/* If the current file has been modified, we've pressed
* Ctrl-X at the edit window to exit, we've pressed "y" at
* the "Save modified buffer" prompt to save, we've entered
* "zzy" as the filename to save under (hence "xyzzy"), and
* this is the first time we've done this, show an Easter
* egg. Display the credits. */
if (!did_credits && exiting && !ISSET(TEMP_FILE) &&
strcasecmp(answer, "zzy") == 0) {
do_credits();
did_credits = TRUE;
break;
}
#endif
if (method == OVERWRITE) {
bool name_exists, do_warning;
char *full_answer, *full_filename;
struct stat st;
full_answer = get_full_path(answer);
full_filename = get_full_path(openfile->filename);
name_exists = (stat((full_answer == NULL) ?
answer : full_answer, &st) != -1);
if (openfile->filename[0] == '\0')
do_warning = name_exists;
else
do_warning = (strcmp((full_answer == NULL) ?
answer : full_answer, (full_filename == NULL) ?
openfile->filename : full_filename) != 0);
free(full_filename);
free(full_answer);
if (do_warning) {
/* When in restricted mode, we aren't allowed to overwrite
* an existing file with the current buffer, nor to change
* the name of the current file if it already has one. */
if (ISSET(RESTRICTED)) {
/* TRANSLATORS: Restricted mode forbids overwriting. */
warn_and_shortly_pause(_("File exists -- "
"cannot overwrite"));
continue;
}
if (!maychange) {
#ifndef NANO_TINY
if (exiting || !openfile->mark_set)
#endif
{
if (do_yesno_prompt(FALSE, _("Save file under "
"DIFFERENT NAME? ")) < 1)
continue;
maychange = TRUE;
}
}
if (name_exists) {
char *question = _("File \"%s\" exists; OVERWRITE? ");
char *message = charalloc(strlen(question) +
strlen(answer) + 1);
sprintf(message, question, answer);
i = do_yesno_prompt(FALSE, message);
free(message);
if (i < 1)
continue;
}
}
#ifndef NANO_TINY
/* Complain if the file exists, the name hasn't changed,
* and the stat information we had before does not match
* what we have now. */
else if (name_exists && openfile->current_stat &&
(openfile->current_stat->st_mtime < st.st_mtime ||
openfile->current_stat->st_dev != st.st_dev ||
openfile->current_stat->st_ino != st.st_ino)) {
warn_and_shortly_pause(_("File on disk has changed"));
if (do_yesno_prompt(FALSE, _("File was modified since "
"you opened it; continue saving? ")) < 1)
continue;
}
#endif
}
/* Here's where we allow the selected text to be written to
* a separate file. If we're using restricted mode, this
* function is disabled, since it allows reading from or
* writing to files not specified on the command line. */
#ifndef NANO_TINY
if (openfile->mark_set && !exiting && !ISSET(RESTRICTED))
result = write_marked_file(answer, NULL, FALSE, method);
else
#endif
result = write_file(answer, NULL, FALSE, method, FALSE);
break;
}
}
free(given);
return result ? 1 : 0;
}
/* Write the current buffer to disk, or discard it. */
void do_writeout_void(void)
{
/* If the user chose to discard the buffer, close it. */
if (do_writeout(FALSE) == 2)
close_and_go();
}
#ifndef NANO_TINY
/* If it has a name, write the current file to disk without prompting. */
void do_savefile(void)
{
if (openfile->filename[0] != '\0')
write_file(openfile->filename, NULL, FALSE, OVERWRITE, FALSE);
else
do_writeout_void();
}
#endif
/* Return a malloc()ed string containing the actual directory, used to
* convert ~user/ and ~/ notation. */
char *real_dir_from_tilde(const char *buf)
{
char *retval;
if (*buf == '~') {
size_t i = 1;
char *tilde_dir;
/* Figure out how much of the string we need to compare. */
for (; buf[i] != '/' && buf[i] != '\0'; i++)
;
/* Get the home directory. */
if (i == 1) {
get_homedir();
tilde_dir = mallocstrcpy(NULL, homedir);
} else {
#ifdef HAVE_PWD_H
const struct passwd *userdata;
tilde_dir = mallocstrncpy(NULL, buf, i + 1);
tilde_dir[i] = '\0';
do {
userdata = getpwent();
} while (userdata != NULL &&
strcmp(userdata->pw_name, tilde_dir + 1) != 0);
endpwent();
if (userdata != NULL)
tilde_dir = mallocstrcpy(tilde_dir, userdata->pw_dir);
#else
tilde_dir = strdup("");
#endif
}
retval = charalloc(strlen(tilde_dir) + strlen(buf + i) + 1);
sprintf(retval, "%s%s", tilde_dir, buf + i);
free(tilde_dir);
} else
retval = mallocstrcpy(NULL, buf);
return retval;
}
#if defined(ENABLE_TABCOMP) || defined(ENABLE_BROWSER)
/* Our sort routine for file listings. Sort alphabetically and
* case-insensitively, and sort directories before filenames. */
int diralphasort(const void *va, const void *vb)
{
struct stat fileinfo;
const char *a = *(const char *const *)va;
const char *b = *(const char *const *)vb;
bool aisdir = stat(a, &fileinfo) != -1 && S_ISDIR(fileinfo.st_mode);
bool bisdir = stat(b, &fileinfo) != -1 && S_ISDIR(fileinfo.st_mode);
if (aisdir && !bisdir)
return -1;
if (!aisdir && bisdir)
return 1;
/* Standard function brain damage: We should be sorting
* alphabetically and case-insensitively according to the current
* locale, but there's no standard strcasecoll() function, so we
* have to use multibyte strcasecmp() instead. */
return mbstrcasecmp(a, b);
}
/* Free the memory allocated for array, which should contain len
* elements. */
void free_chararray(char **array, size_t len)
{
if (array == NULL)
return;
for (; len > 0; len--)
free(array[len - 1]);
free(array);
}
#endif
#ifdef ENABLE_TABCOMP
/* Is the given path a directory? */
bool is_dir(const char *buf)
{
char *dirptr;
struct stat fileinfo;
bool retval;
dirptr = real_dir_from_tilde(buf);
retval = (stat(dirptr, &fileinfo) != -1 && S_ISDIR(fileinfo.st_mode));
free(dirptr);
return retval;
}
/* These functions, username_tab_completion(), cwd_tab_completion()
* (originally exe_n_cwd_tab_completion()), and input_tab(), were
* adapted from busybox 0.46 (cmdedit.c). Here is the notice from that
* file, with the copyright years updated:
*
* Termios command line History and Editting, originally
* intended for NetBSD sh (ash)
* Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007
* Main code: Adam Rogoyski <rogoyski@cs.utexas.edu>
* Etc: Dave Cinege <dcinege@psychosis.com>
* Majorly adjusted/re-written for busybox:
* Erik Andersen <andersee@debian.org>
*
* You may use this code as you wish, so long as the original author(s)
* are attributed in any redistributions of the source code.
* This code is 'as is' with no warranty.
* This code may safely be consumed by a BSD or GPL license. */
/* We consider the first buf_len characters of buf for ~username tab
* completion. */
char **username_tab_completion(const char *buf, size_t *num_matches,
size_t buf_len)
{
char **matches = NULL;
#ifdef HAVE_PWD_H
const struct passwd *userdata;
#endif
assert(buf != NULL && num_matches != NULL && buf_len > 0);
*num_matches = 0;
#ifdef HAVE_PWD_H
while ((userdata = getpwent()) != NULL) {
if (strncmp(userdata->pw_name, buf + 1, buf_len - 1) == 0) {
/* Cool, found a match. Add it to the list. This makes a
* lot more sense to me (Chris) this way... */
#ifndef DISABLE_OPERATINGDIR
/* ...unless the match exists outside the operating
* directory, in which case just go to the next match. */
if (check_operating_dir(userdata->pw_dir, TRUE))
continue;
#endif
matches = (char **)nrealloc(matches, (*num_matches + 1) *
sizeof(char *));
matches[*num_matches] = charalloc(strlen(userdata->pw_name) + 2);
sprintf(matches[*num_matches], "~%s", userdata->pw_name);
++(*num_matches);
}
}
endpwent();
#endif
return matches;
}
/* We consider the first buf_len characters of buf for filename tab
* completion. */
char **cwd_tab_completion(const char *buf, bool allow_files, size_t
*num_matches, size_t buf_len)
{
char *dirname = mallocstrcpy(NULL, buf);
char *slash, *filename;
size_t filenamelen;
char **matches = NULL;
DIR *dir;
const struct dirent *nextdir;
*num_matches = 0;
dirname[buf_len] = '\0';
/* If there's a / in the name, split out filename and directory parts. */
slash = strrchr(dirname, '/');
if (slash != NULL) {
char *wasdirname = dirname;
filename = mallocstrcpy(NULL, ++slash);
/* Cut off the filename part after the slash. */
*slash = '\0';
dirname = real_dir_from_tilde(dirname);
/* A non-absolute path is relative to the current browser directory. */
if (dirname[0] != '/') {
dirname = charealloc(dirname, strlen(present_path) +
strlen(wasdirname) + 1);
sprintf(dirname, "%s%s", present_path, wasdirname);
}
free(wasdirname);
} else {
filename = dirname;
dirname = mallocstrcpy(NULL, present_path);
}
assert(dirname[strlen(dirname) - 1] == '/');
dir = opendir(dirname);
if (dir == NULL) {
/* Don't print an error, just shut up and return. */
beep();
free(filename);
free(dirname);
return NULL;
}
filenamelen = strlen(filename);
while ((nextdir = readdir(dir)) != NULL) {
bool skip_match = FALSE;
#ifdef DEBUG
fprintf(stderr, "Comparing \'%s\'\n", nextdir->d_name);
#endif
/* See if this matches. */
if (strncmp(nextdir->d_name, filename, filenamelen) == 0 &&
(*filename == '.' || (strcmp(nextdir->d_name, ".") != 0 &&
strcmp(nextdir->d_name, "..") != 0))) {
/* Cool, found a match. Add it to the list. This makes a
* lot more sense to me (Chris) this way... */
char *tmp = charalloc(strlen(dirname) + strlen(nextdir->d_name) + 1);
sprintf(tmp, "%s%s", dirname, nextdir->d_name);
#ifndef DISABLE_OPERATINGDIR
/* ...unless the match exists outside the operating
* directory, in which case just go to the next match. */
if (check_operating_dir(tmp, TRUE))
skip_match = TRUE;
#endif
/* ...or unless the match isn't a directory and allow_files
* isn't set, in which case just go to the next match. */
if (!allow_files && !is_dir(tmp))
skip_match = TRUE;
free(tmp);
if (skip_match)
continue;
matches = (char **)nrealloc(matches, (*num_matches + 1) *
sizeof(char *));
matches[*num_matches] = mallocstrcpy(NULL, nextdir->d_name);
++(*num_matches);
}
}
closedir(dir);
free(dirname);
free(filename);
return matches;
}
/* Do tab completion. place refers to how much the statusbar cursor
* position should be advanced. refresh_func is the function we will
* call to refresh the edit window. */
char *input_tab(char *buf, bool allow_files, size_t *place,
bool *lastwastab, void (*refresh_func)(void), bool *listed)
{
size_t num_matches = 0, buf_len;
char **matches = NULL;
assert(buf != NULL && place != NULL && *place <= strlen(buf) &&
lastwastab != NULL && refresh_func != NULL && listed != NULL);
*listed = FALSE;
/* If the word starts with `~' and there is no slash in the word,
* then try completing this word as a username. */
if (*place > 0 && *buf == '~') {
const char *slash = strchr(buf, '/');
if (slash == NULL || slash >= buf + *place)
matches = username_tab_completion(buf, &num_matches, *place);
}
/* Match against files relative to the current working directory. */
if (matches == NULL)
matches = cwd_tab_completion(buf, allow_files, &num_matches, *place);
buf_len = strlen(buf);
if (num_matches == 0 || *place != buf_len)
beep();
else {
size_t match, common_len = 0;
char *mzero, *glued;
const char *lastslash = revstrstr(buf, "/", buf + *place);
size_t lastslash_len = (lastslash == NULL) ? 0 : lastslash - buf + 1;
char char1[MAXCHARLEN], char2[MAXCHARLEN];
int len1, len2;
/* Get the number of characters that all matches have in common. */
while (TRUE) {
len1 = parse_mbchar(matches[0] + common_len, char1, NULL);
for (match = 1; match < num_matches; match++) {
len2 = parse_mbchar(matches[match] + common_len, char2, NULL);
if (len1 != len2 || strncmp(char1, char2, len2) != 0)
break;
}
if (match < num_matches || matches[0][common_len] == '\0')
break;
common_len += len1;
}
mzero = charalloc(lastslash_len + common_len + 1);
strncpy(mzero, buf, lastslash_len);
strncpy(mzero + lastslash_len, matches[0], common_len);
common_len += lastslash_len;
mzero[common_len] = '\0';
/* Cover also the case of the user specifying a relative path. */
glued = charalloc(strlen(present_path) + strlen(mzero) + 1);
sprintf(glued, "%s%s", present_path, mzero);
assert(common_len >= *place);
if (num_matches == 1 && (is_dir(mzero) || is_dir(glued))) {
mzero[common_len++] = '/';
assert(common_len > *place);
}
if (num_matches > 1 && (common_len != *place || !*lastwastab))
beep();
/* If the matches have something in common, show that part. */
if (common_len != *place) {
buf = charealloc(buf, common_len + buf_len - *place + 1);
charmove(buf + common_len, buf + *place, buf_len - *place + 1);
strncpy(buf, mzero, common_len);
*place = common_len;
}
if (!*lastwastab)
*lastwastab = TRUE;
else if (num_matches > 1) {
int longest_name = 0, ncols, editline = 0;
/* Sort the list of available choices. */
qsort(matches, num_matches, sizeof(char *), diralphasort);
/* Find the length of the longest among the choices. */
for (match = 0; match < num_matches; match++) {
size_t namelen = strlenpt(matches[match]);
if (namelen > longest_name)
longest_name = namelen;
}
if (longest_name > COLS - 1)
longest_name = COLS - 1;
/* Each column will be (longest_name + 2) columns wide, i.e.
* two spaces between columns, except that there will be
* only one space after the last column. */
ncols = (COLS + 1) / (longest_name + 2);
/* Blank the edit window and hide the cursor. */
blank_edit();
curs_set(0);
wmove(edit, 0, 0);
/* Now print the list of matches out there. */
for (match = 0; match < num_matches; match++) {
char *disp;
wmove(edit, editline, (longest_name + 2) * (match % ncols));
if (match % ncols == 0 && editline == editwinrows - 1 &&
num_matches - match > ncols) {
waddstr(edit, _("(more)"));
break;
}
disp = display_string(matches[match], 0, longest_name, FALSE);
waddstr(edit, disp);
free(disp);
if ((match + 1) % ncols == 0)
editline++;
}
wnoutrefresh(edit);
*listed = TRUE;
}
free(glued);
free(mzero);
}
free_chararray(matches, num_matches);
/* When we didn't list any matches now, refresh the edit window, just
* in case a previous tab showed a list, so we know where we are. */
if (!*listed)
refresh_func();
return buf;
}
#endif /* ENABLE_TABCOMP */
/* Return the filename part of the given path. */
const char *tail(const char *path)
{
const char *slash = strrchr(path, '/');
if (slash == NULL)
return path;
else
return ++slash;
}
#ifndef DISABLE_HISTORIES
/* Return the constructed dirfile path, or NULL if we can't find the home
* directory. The string is dynamically allocated, and should be freed. */
char *construct_filename(const char *str)
{
char *newstr = NULL;
if (homedir != NULL) {
size_t homelen = strlen(homedir);
newstr = charalloc(homelen + strlen(str) + 1);
strcpy(newstr, homedir);
strcpy(newstr + homelen, str);
}
return newstr;
}
char *histfilename(void)
{
return construct_filename("/.nano/search_history");
}
/* Construct the legacy history filename. */
/* (To be removed in 2018.) */
char *legacyhistfilename(void)
{
return construct_filename("/.nano_history");
}
char *poshistfilename(void)
{
return construct_filename("/.nano/filepos_history");
}
void history_error(const char *msg, ...)
{
va_list ap;
va_start(ap, msg);
vfprintf(stderr, _(msg), ap);
va_end(ap);
fprintf(stderr, _("\nPress Enter to continue\n"));
while (getchar() != '\n')
;
}
/* Now that we have more than one history file, let's just rely on a
* .nano dir for this stuff. Return 1 if the dir exists or was
* successfully created, and return 0 otherwise. */
int check_dotnano(void)
{
int ret = 1;
struct stat dirstat;
char *nanodir = construct_filename("/.nano");
if (stat(nanodir, &dirstat) == -1) {
if (mkdir(nanodir, S_IRWXU | S_IRWXG | S_IRWXO) == -1) {
history_error(N_("Unable to create directory %s: %s\n"
"It is required for saving/loading "
"search history or cursor positions.\n"),
nanodir, strerror(errno));
ret = 0;
}
} else if (!S_ISDIR(dirstat.st_mode)) {
history_error(N_("Path %s is not a directory and needs to be.\n"
"Nano will be unable to load or save "
"search history or cursor positions.\n"),
nanodir);
ret = 0;
}
free(nanodir);
return ret;
}
/* Load the search and replace histories from ~/.nano/search_history. */
void load_history(void)
{
char *nanohist = histfilename();
char *legacyhist = legacyhistfilename();
struct stat hstat;
/* If there is an old history file, migrate it. */
/* (To be removed in 2018.) */
if (stat(legacyhist, &hstat) != -1 && stat(nanohist, &hstat) == -1) {
if (rename(legacyhist, nanohist) == -1)
history_error(N_("Detected a legacy nano history file (%s) which I tried to move\n"
"to the preferred location (%s) but encountered an error: %s"),
legacyhist, nanohist, strerror(errno));
else
history_error(N_("Detected a legacy nano history file (%s) which I moved\n"
"to the preferred location (%s)\n(see the nano FAQ about this change)"),
legacyhist, nanohist);
}
/* Assume do_rcfile() has reported a missing home directory. */
if (nanohist != NULL) {
FILE *hist = fopen(nanohist, "rb");
if (hist == NULL) {
if (errno != ENOENT) {
/* Don't save history when we quit. */
UNSET(HISTORYLOG);
history_error(N_("Error reading %s: %s"), nanohist,
strerror(errno));
}
} else {
/* Load a history list (first the search history, then the
* replace history) from the oldest entry to the newest.
* Assume the last history entry is a blank line. */
filestruct **history = &search_history;
char *line = NULL;
size_t buf_len = 0;
ssize_t read;
while ((read = getline(&line, &buf_len, hist)) > 0) {
line[--read] = '\0';
if (read > 0) {
/* Encode any embedded NUL as 0x0A. */
unsunder(line, read);
update_history(history, line);
} else
history = &replace_history;
}
fclose(hist);
free(line);
}
free(nanohist);
free(legacyhist);
}
}
/* Write the lines of a history list, starting with the line at head, to
* the open file at hist. Return TRUE if the write succeeded, and FALSE
* otherwise. */
bool writehist(FILE *hist, const filestruct *head)
{
const filestruct *item;
/* Write a history list, from the oldest item to the newest. */
for (item = head; item != NULL; item = item->next) {
size_t length = strlen(item->data);
/* Decode 0x0A bytes as embedded NULs. */
sunder(item->data);
if (fwrite(item->data, sizeof(char), length, hist) < length)
return FALSE;
if (putc('\n', hist) == EOF)
return FALSE;
}
return TRUE;
}
/* Save the search and replace histories to ~/.nano/search_history. */
void save_history(void)
{
char *nanohist;
/* Don't save unchanged or empty histories. */
if (!history_has_changed() || (searchbot->lineno == 1 &&
replacebot->lineno == 1))
return;
nanohist = histfilename();
if (nanohist != NULL) {
FILE *hist = fopen(nanohist, "wb");
if (hist == NULL)
fprintf(stderr, _("Error writing %s: %s\n"), nanohist,
strerror(errno));
else {
/* Make sure no one else can read from or write to the
* history file. */
chmod(nanohist, S_IRUSR | S_IWUSR);
if (!writehist(hist, searchage) || !writehist(hist, replaceage))
fprintf(stderr, _("Error writing %s: %s\n"), nanohist,
strerror(errno));
fclose(hist);
}
free(nanohist);
}
}
/* Save the recorded last file positions to ~/.nano/filepos_history. */
void save_poshistory(void)
{
char *poshist = poshistfilename();
poshiststruct *posptr;
FILE *hist;
if (poshist == NULL)
return;
hist = fopen(poshist, "wb");
if (hist == NULL)
fprintf(stderr, _("Error writing %s: %s\n"), poshist, strerror(errno));
else {
/* Don't allow others to read or write the history file. */
chmod(poshist, S_IRUSR | S_IWUSR);
for (posptr = position_history; posptr != NULL; posptr = posptr->next) {
char *path_and_place;
size_t length;
/* Assume 20 decimal positions each for line and column number,
* plus two spaces, plus the line feed, plus the null byte. */
path_and_place = charalloc(strlen(posptr->filename) + 44);
sprintf(path_and_place, "%s %ld %ld\n", posptr->filename,
(long)posptr->lineno, (long)posptr->xno);
length = strlen(path_and_place);
/* Encode newlines in filenames as nulls. */
sunder(path_and_place);
/* Restore the terminating newline. */
path_and_place[length - 1] = '\n';
if (fwrite(path_and_place, sizeof(char), length, hist) < length)
fprintf(stderr, _("Error writing %s: %s\n"),
poshist, strerror(errno));
free(path_and_place);
}
fclose(hist);
}
free(poshist);
}
/* Update the recorded last file positions, given a filename, a line
* and a column. If no entry is found, add a new one at the end. */
void update_poshistory(char *filename, ssize_t lineno, ssize_t xpos)
{
poshiststruct *posptr, *theone, *posprev = NULL;
char *fullpath = get_full_path(filename);
if (fullpath == NULL || fullpath[strlen(fullpath) - 1] == '/' || inhelp) {
free(fullpath);
return;
}
/* Look for a matching filename in the list. */
for (posptr = position_history; posptr != NULL; posptr = posptr->next) {
if (!strcmp(posptr->filename, fullpath))
break;
posprev = posptr;
}
/* Don't record files that have the default cursor position. */
if (lineno == 1 && xpos == 1) {
if (posptr != NULL) {
if (posprev == NULL)
position_history = posptr->next;
else
posprev->next = posptr->next;
free(posptr->filename);
free(posptr);
}
free(fullpath);
return;
}
theone = posptr;
/* If we didn't find it, make a new node; otherwise, if we're
* not at the end, move the matching one to the end. */
if (theone == NULL) {
theone = (poshiststruct *)nmalloc(sizeof(poshiststruct));
theone->filename = mallocstrcpy(NULL, fullpath);
if (position_history == NULL)
position_history = theone;
else
posprev->next = theone;
} else if (posptr->next != NULL) {
if (posprev == NULL)
position_history = posptr->next;
else
posprev->next = posptr->next;
while (posptr->next != NULL)
posptr = posptr->next;
posptr->next = theone;
}
/* Store the last cursor position. */
theone->lineno = lineno;
theone->xno = xpos;
theone->next = NULL;
free(fullpath);
}
/* Check whether the given file matches an existing entry in the recorded
* last file positions. If not, return FALSE. If yes, return TRUE and
* set line and column to the retrieved values. */
bool has_old_position(const char *file, ssize_t *line, ssize_t *column)
{
poshiststruct *posptr = position_history;
char *fullpath = get_full_path(file);
if (fullpath == NULL)
return FALSE;
while (posptr != NULL && strcmp(posptr->filename, fullpath) != 0)
posptr = posptr->next;
free(fullpath);
if (posptr == NULL)
return FALSE;
*line = posptr->lineno;
*column = posptr->xno;
return TRUE;
}
/* Load the recorded file positions from ~/.nano/filepos_history. */
void load_poshistory(void)
{
char *poshist = poshistfilename();
FILE *hist;
/* If the home directory is missing, do_rcfile() will have reported it. */
if (poshist == NULL)
return;
hist = fopen(poshist, "rb");
if (hist == NULL) {
if (errno != ENOENT) {
/* When reading failed, don't save history when we quit. */
UNSET(POS_HISTORY);
history_error(N_("Error reading %s: %s"), poshist, strerror(errno));
}
} else {
char *line = NULL, *lineptr, *xptr;
size_t buf_len = 0;
ssize_t read, count = 0;
poshiststruct *record_ptr = NULL, *newrecord;
/* Read and parse each line, and store the extracted data. */
while ((read = getline(&line, &buf_len, hist)) > 5) {
/* Decode nulls as embedded newlines. */
unsunder(line, read);
/* Find where the x index and line number are in the line. */
xptr = revstrstr(line, " ", line + read - 3);
if (xptr == NULL)
continue;
lineptr = revstrstr(line, " ", xptr - 2);
if (lineptr == NULL)
continue;
/* Now separate the three elements of the line. */
*(xptr++) = '\0';
*(lineptr++) = '\0';
/* Create a new position record. */
newrecord = (poshiststruct *)nmalloc(sizeof(poshiststruct));
newrecord->filename = mallocstrcpy(NULL, line);
newrecord->lineno = atoi(lineptr);
newrecord->xno = atoi(xptr);
newrecord->next = NULL;
/* Add the record to the list. */
if (position_history == NULL)
position_history = newrecord;
else
record_ptr->next = newrecord;
record_ptr = newrecord;
/* Impose a limit, so the file will not grow indefinitely. */
if (++count > 200) {
poshiststruct *drop_record = position_history;
position_history = position_history->next;
free(drop_record->filename);
free(drop_record);
}
}
fclose(hist);
free(line);
}
free(poshist);
}
#endif /* !DISABLE_HISTORIES */