move get_page_start() from winio.c to utils.c too, and fix a few

comments


git-svn-id: svn://svn.savannah.gnu.org/nano/trunk/nano@3066 35c25a1d-7b9e-4130-9fde-d3aeb78583b8

ChangeLog

@@ -15,8 +15,9 @@ CVS code -
 	  that make use of a smaller number.  Changes to window_init(),
 	  nanoget_repaint(), titlebar(), statusbar(), and
 	  get_page_start(). (DLR)
-	- Move xplustabs(), actual_x(), strnlenpt(), and strlenpt() from
-	  winio.c to utils.c, as they're really utility functions. (DLR)
+	- Move get_page_start(), xplustabs(), actual_x(), strnlenpt(),
+	  and strlenpt() from winio.c to utils.c, as they're really
+	  utility functions. (DLR)
 	- Move functions specific to the statusbar prompt to their own
 	  source file, and adjust related variables accordingly.  New
 	  file prompt.c; changes to do_statusbar_input(),

src/proto.h

@@ -604,6 +604,7 @@ void *nrealloc(void *ptr, size_t howmuch);
 char *mallocstrncpy(char *dest, const char *src, size_t n);
 char *mallocstrcpy(char *dest, const char *src);
 char *mallocstrassn(char *dest, char *src);
+size_t get_page_start(size_t column);
 size_t xplustabs(void);
 size_t actual_x(const char *s, size_t column);
 size_t strnlenpt(const char *s, size_t maxlen);
@@ -670,7 +671,6 @@ void set_modified(void);
 void statusbar(const char *msg, ...);
 void bottombars(const shortcut *s);
 void onekey(const char *keystroke, const char *desc, size_t len);
-size_t get_page_start(size_t column);
 void reset_cursor(void);
 void edit_draw(const filestruct *fileptr, const char *converted, int
 	line, size_t start);

src/utils.c

@@ -395,6 +395,20 @@ char *mallocstrassn(char *dest, char *src)
     return src;
 }
 
+/* nano scrolls horizontally within a line in chunks.  Return the column
+ * number of the first character displayed in the edit window when the
+ * cursor is at the given column.  Note that (0 <= column -
+ * get_page_start(column) < COLS). */
+size_t get_page_start(size_t column)
+{
+    if (column == 0 || column < COLS - 1)
+	return 0;
+    else if (COLS > 9)
+	return column - 7 - (column - 7) % (COLS - 8);
+    else
+	return column - (COLS - 2);
+}
+
 /* Return the placewewant associated with current_x, i.e, the zero-based
  * column position of the cursor.  The value will be no smaller than
  * current_x. */
@@ -403,9 +417,9 @@ size_t xplustabs(void)
     return strnlenpt(openfile->current->data, openfile->current_x);
 }
 
-/* actual_x() gives the index in s of the character displayed at the
- * given column.  That is, actual_x() is the largest value such that
- * strnlenpt(s, actual_x(s, column)) <= column. */
+/* Return the index in s of the character displayed at the given column,
+ * i.e, the largest value such that strnlenpt(s, actual_x(s, column)) <=
+ * column. */
 size_t actual_x(const char *s, size_t column)
 {
     size_t i = 0;

src/winio.c

@@ -2185,22 +2185,8 @@ void onekey(const char *keystroke, const char *desc, size_t len)
     }
 }
 
-/* nano scrolls horizontally within a line in chunks.  This function
- * returns the column number of the first character displayed in the
- * edit window when the cursor is at the given column.  Note that (0 <=
- * column - get_page_start(column) < COLS). */
-size_t get_page_start(size_t column)
-{
-    if (column == 0 || column < COLS - 1)
-	return 0;
-    else if (COLS > 9)
-	return column - 7 - (column - 7) % (COLS - 8);
-    else
-	return column - (COLS - 2);
-}
-
-/* Resets current_y, based on the position of current, and puts the
- * cursor in the edit window at (current_y, current_x). */
+/* Reset current_y, based on the position of current, and put the cursor
+ * in the edit window at (current_y, current_x). */
 void reset_cursor(void)
 {
     /* If we haven't opened any files yet, put the cursor in the top