/* $Id$ */
/**************************************************************************
* utils.c *
* *
* Copyright (C) 1999-2005 Chris Allegretta *
* This program 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 2, or (at your option) *
* any later version. *
* *
* This program 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, write to the Free Software *
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. *
* *
**************************************************************************/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <pwd.h>
#include <ctype.h>
#include <errno.h>
#include <assert.h>
#include "proto.h"
#ifdef HAVE_REGEX_H
#ifdef BROKEN_REGEXEC
/* Work around a potential segfault in glibc 2.2.3's regexec(). */
int safe_regexec(const regex_t *preg, const char *string, size_t nmatch,
regmatch_t pmatch[], int eflags)
{
if (string != NULL && *string != '\0')
return regexec(preg, string, nmatch, pmatch, eflags);
return REG_NOMATCH;
}
#endif
int regexp_bol_or_eol(const regex_t *preg, const char *string)
{
return (regexec(preg, string, 0, NULL, 0) == 0 &&
regexec(preg, string, 0, NULL, REG_NOTBOL | REG_NOTEOL) ==
REG_NOMATCH);
}
#endif /* HAVE_REGEX_H */
int digits(size_t n)
{
int i = 1;
while (n > 10) {
n /= 10;
i++;
}
return i;
}
/* Return the user's home directory. We use $HOME, and if that fails,
* we fall back on getpwuid(). */
void get_homedir(void)
{
if (homedir == NULL) {
const char *homenv = getenv("HOME");
if (homenv == NULL) {
const struct passwd *userage = getpwuid(geteuid());
if (userage != NULL)
homenv = userage->pw_dir;
}
homedir = mallocstrcpy(NULL, homenv);
}
}
/* Read a ssize_t from str, and store it in *val (if val is not NULL).
* On error, we return FALSE and don't change *val. Otherwise, we
* return TRUE. */
bool parse_num(const char *str, ssize_t *val)
{
char *first_error;
ssize_t j;
assert(str != NULL);
j = (ssize_t)strtol(str, &first_error, 10);
if (errno == ERANGE || *str == '\0' || *first_error != '\0')
return FALSE;
if (val != NULL)
*val = j;
return TRUE;
}
/* Fix the memory allocation for a string. */
void align(char **strp)
{
assert(strp != NULL);
if (*strp != NULL)
*strp = charealloc(*strp, strlen(*strp) + 1);
}
/* Null a string at a certain index and align it. */
void null_at(char **data, size_t index)
{
assert(data != NULL);
*data = charealloc(*data, index + 1);
(*data)[index] = '\0';
}
/* For non-null-terminated lines. A line, by definition, shouldn't
* normally have newlines in it, so encode its nulls as newlines. */
void unsunder(char *str, size_t true_len)
{
assert(str != NULL);
for (; true_len > 0; true_len--, str++) {
if (*str == '\0')
*str = '\n';
}
}
/* For non-null-terminated lines. A line, by definition, shouldn't
* normally have newlines in it, so decode its newlines into nulls. */
void sunder(char *str)
{
assert(str != NULL);
for (; *str != '\0'; str++) {
if (*str == '\n')
*str = '\0';
}
}
#if !defined(NANO_SMALL) && defined(ENABLE_NANORC)
#ifndef HAVE_GETLINE
/* This function is equivalent to getline(). It was adapted from
* GNU mailutils' getline() function. */
ssize_t ngetline(char **lineptr, size_t *n, FILE *stream)
{
return getdelim(lineptr, n, '\n', stream);
}
#endif
#ifndef HAVE_GETDELIM
/* This function is equivalent to getdelim(). It was adapted from
* GNU mailutils' getdelim() function. */
ssize_t ngetdelim(char **lineptr, size_t *n, int delim, FILE *stream)
{
size_t indx = 0;
int c;
/* Sanity checks. */
if (lineptr == NULL || n == NULL || stream == NULL)
return -1;
/* Allocate the line the first time. */
if (*lineptr == NULL) {
*lineptr = charalloc(MAX_BUF_SIZE);
*n = MAX_BUF_SIZE;
}
while ((c = getc(stream)) != EOF) {
/* Check if more memory is needed. */
if (indx >= *n) {
*lineptr = charealloc(*lineptr, *n + MAX_BUF_SIZE);
*n += MAX_BUF_SIZE;
}
/* Push the result in the line. */
(*lineptr)[indx++] = (char)c;
/* Bail out. */
if (c == delim)
break;
}
/* Make room for the null character. */
if (indx >= *n) {
*lineptr = charealloc(*lineptr, *n + MAX_BUF_SIZE);
*n += MAX_BUF_SIZE;
}
/* Null terminate the buffer. */
null_at(lineptr, indx++);
*n = indx;
/* The last line may not have the delimiter, we have to return what
* we got and the error will be seen on the next iteration. */
return (c == EOF && (indx - 1) == 0) ? -1 : indx - 1;
}
#endif
#endif /* !NANO_SMALL && ENABLE_NANORC */
/* If we are searching backwards, we will find the last match that
* starts no later than start. Otherwise we find the first match
* starting no earlier than start. If we are doing a regexp search, we
* fill in the global variable regmatches with at most 9 subexpression
* matches. Also, all .rm_so elements are relative to the start of the
* whole match, so regmatches[0].rm_so == 0. */
const char *strstrwrapper(const char *haystack, const char *needle,
const char *start)
{
/* start can be 1 character before the start or after the end of the
* line. In either case, we just say no match was found. */
if ((start > haystack && *(start - 1) == '\0') || start < haystack)
return NULL;
assert(haystack != NULL && needle != NULL && start != NULL);
#ifdef HAVE_REGEX_H
if (ISSET(USE_REGEXP)) {
#ifndef NANO_SMALL
if (ISSET(REVERSE_SEARCH)) {
if (regexec(&search_regexp, haystack, 1, regmatches, 0) == 0
&& haystack + regmatches[0].rm_so <= start) {
const char *retval = haystack + regmatches[0].rm_so;
/* Search forward until there are no more matches. */
while (regexec(&search_regexp, retval + 1, 1, regmatches,
REG_NOTBOL) == 0 && retval + 1 +
regmatches[0].rm_so <= start)
retval += 1 + regmatches[0].rm_so;
/* Finally, put the subexpression matches in global
* variable regmatches. The REG_NOTBOL flag doesn't
* matter now. */
regexec(&search_regexp, retval, 10, regmatches, 0);
return retval;
}
} else
#endif /* !NANO_SMALL */
if (regexec(&search_regexp, start, 10, regmatches,
(start > haystack) ? REG_NOTBOL : 0) == 0) {
const char *retval = start + regmatches[0].rm_so;
regexec(&search_regexp, retval, 10, regmatches, 0);
return retval;
}
return NULL;
}
#endif /* HAVE_REGEX_H */
#if !defined(NANO_SMALL) || !defined(DISABLE_SPELLER)
if (ISSET(CASE_SENSITIVE)) {
#ifndef NANO_SMALL
if (ISSET(REVERSE_SEARCH))
return revstrstr(haystack, needle, start);
else
#endif
return strstr(start, needle);
}
#endif /* !DISABLE_SPELLER || !NANO_SMALL */
#ifndef NANO_SMALL
else if (ISSET(REVERSE_SEARCH))
return mbrevstrcasestr(haystack, needle, start);
#endif
return mbstrcasestr(start, needle);
}
/* This is a wrapper for the perror() function. The wrapper takes care
* of curses, calls perror() (which writes to stderr), and then
* refreshes the screen. Note that nperror() causes the window to
* flicker once. */
void nperror(const char *s)
{
/* Leave curses mode and go to the terminal. */
if (endwin() != ERR) {
perror(s); /* Print the error. */
total_refresh(); /* Return to curses and refresh. */
}
}
/* Thanks, BG, many people have been asking for this... */
void *nmalloc(size_t howmuch)
{
void *r = malloc(howmuch);
if (r == NULL && howmuch != 0)
die(_("nano is out of memory!"));
return r;
}
void *nrealloc(void *ptr, size_t howmuch)
{
void *r = realloc(ptr, howmuch);
if (r == NULL && howmuch != 0)
die(_("nano is out of memory!"));
return r;
}
/* Copy the first n characters of one malloc()ed string to another
* pointer. Should be used as: "dest = mallocstrncpy(dest, src,
* n);". */
char *mallocstrncpy(char *dest, const char *src, size_t n)
{
if (src == NULL)
src = "";
if (src != dest)
free(dest);
dest = charalloc(n);
strncpy(dest, src, n);
return dest;
}
/* Copy one malloc()ed string to another pointer. Should be used as:
* "dest = mallocstrcpy(dest, src);". */
char *mallocstrcpy(char *dest, const char *src)
{
return mallocstrncpy(dest, src, src == NULL ? 1 : strlen(src) + 1);
}
/* Free the malloc()ed string at dest and return the malloc()ed string
* at src. Should be used as: "answer = mallocstrassn(answer,
* real_dir_from_tilde(answer));". */
char *mallocstrassn(char *dest, char *src)
{
free(dest);
return src;
}
/* Append a new magicline to filebot. */
void new_magicline(void)
{
filebot->next = (filestruct *)nmalloc(sizeof(filestruct));
filebot->next->data = mallocstrcpy(NULL, "");
filebot->next->prev = filebot;
filebot->next->next = NULL;
filebot->next->lineno = filebot->lineno + 1;
filebot = filebot->next;
totlines++;
totsize++;
}
#ifndef NANO_SMALL
/* Remove the magicline from filebot, if there is one and it isn't the
* only line in the file. */
void remove_magicline(void)
{
if (filebot->data[0] == '\0' && filebot->prev != NULL) {
filebot = filebot->prev;
free_filestruct(filebot->next);
filebot->next = NULL;
totlines--;
totsize--;
}
}
/* Set top_x and bot_x to the top and bottom x-coordinates of the mark,
* respectively, based on the locations of top and bot. If
* right_side_up isn't NULL, set it to TRUE If the mark begins with
* (mark_beginbuf, mark_beginx) and ends with (current, current_x), or
* FALSE otherwise. */
void mark_order(const filestruct **top, size_t *top_x, const filestruct
**bot, size_t *bot_x, bool *right_side_up)
{
assert(top != NULL && top_x != NULL && bot != NULL && bot_x != NULL);
if ((current->lineno == mark_beginbuf->lineno && current_x >
mark_beginx) || current->lineno > mark_beginbuf->lineno) {
*top = mark_beginbuf;
*top_x = mark_beginx;
*bot = current;
*bot_x = current_x;
if (right_side_up != NULL)
*right_side_up = TRUE;
} else {
*bot = mark_beginbuf;
*bot_x = mark_beginx;
*top = current;
*top_x = current_x;
if (right_side_up != NULL)
*right_side_up = FALSE;
}
}
#endif
/* Calculate the number of lines and the number of characters between
* begin and end, and return them in lines and size, respectively. */
void get_totals(const filestruct *begin, const filestruct *end, int
*lines, size_t *size)
{
const filestruct *f;
if (lines != NULL)
*lines = 0;
if (size != NULL)
*size = 0;
/* Go through the lines from begin to end->prev, if we can. */
for (f = begin; f != NULL && f != end; f = f->next) {
/* Count this line. */
if (lines != NULL)
(*lines)++;
/* Count the number of characters on this line. */
if (size != NULL) {
*size += mbstrlen(f->data);
/* Count the newline if we have one. */
if (f->next != NULL)
(*size)++;
}
}
/* Go through the line at end, if we can. */
if (f != NULL) {
/* Count this line. */
if (lines != NULL)
(*lines)++;
/* Count the number of characters on this line. */
if (size != NULL) {
*size += mbstrlen(f->data);
/* Count the newline if we have one. */
if (f->next != NULL)
(*size)++;
}
}
}