+/* vi: set sw=4 ts=4: */
/*
- * 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 of the License, or
- * (at your option) any later version.
+ * Utility routines.
*
- * 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 Library General Public License for more details.
+ * Copyright (C) many different people.
+ * If you wrote this, please acknowledge your work.
*
- * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+#include "libbb.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include <string.h>
-
-/*
- * Continue reading from file until the terminating string is encountered.
- * Return data as string.
- * e.g. fgets_str(file, "\n"); will read till end of file
- */
-
-char *fgets_str(FILE *file, const char *terminating_string)
+static char *xmalloc_fgets_internal(FILE *file, const char *terminating_string, int chop_off, size_t *maxsz_p)
{
char *linebuf = NULL;
const int term_length = strlen(terminating_string);
int linebufsz = 0;
int idx = 0;
int ch;
+ size_t maxsz = *maxsz_p;
while (1) {
ch = fgetc(file);
if (ch == EOF) {
+ if (idx == 0)
+ return linebuf; /* NULL */
break;
}
- /* grow the line buffer as necessary */
- while (idx > linebufsz - 2) {
- linebuf = realloc(linebuf, linebufsz += 1000); /* GROWBY */
+ if (idx >= linebufsz) {
+ linebufsz += 200;
+ linebuf = xrealloc(linebuf, linebufsz);
+ if (idx >= maxsz) {
+ linebuf[idx] = ch;
+ idx++;
+ break;
+ }
}
linebuf[idx] = ch;
/* Check for terminating string */
end_string_offset = idx - term_length;
- if ((end_string_offset > 0) && (memcmp(&linebuf[end_string_offset], terminating_string, term_length) == 0)) {
- idx -= term_length;
+ if (end_string_offset >= 0
+ && memcmp(&linebuf[end_string_offset], terminating_string, term_length) == 0
+ ) {
+ if (chop_off)
+ idx -= term_length;
break;
}
}
- if (idx == 0 || linebuf[0] == '\n') {
- return NULL;
- }
+ /* Grow/shrink *first*, then store NUL */
+ linebuf = xrealloc(linebuf, idx + 1);
linebuf[idx] = '\0';
- return(linebuf);
+ *maxsz_p = idx;
+ return linebuf;
+}
+
+/* Read up to TERMINATING_STRING from FILE and return it,
+ * including terminating string.
+ * Non-terminated string can be returned if EOF is reached.
+ * Return NULL if EOF is reached immediately. */
+char* FAST_FUNC xmalloc_fgets_str(FILE *file, const char *terminating_string)
+{
+ size_t maxsz = INT_MAX - 4095;
+ return xmalloc_fgets_internal(file, terminating_string, 0, &maxsz);
}
+char* FAST_FUNC xmalloc_fgets_str_len(FILE *file, const char *terminating_string, size_t *maxsz_p)
+{
+ size_t maxsz;
+
+ if (!maxsz_p) {
+ maxsz = INT_MAX - 4095;
+ maxsz_p = &maxsz;
+ }
+ return xmalloc_fgets_internal(file, terminating_string, 0, maxsz_p);
+}
+
+char* FAST_FUNC xmalloc_fgetline_str(FILE *file, const char *terminating_string)
+{
+ size_t maxsz = INT_MAX - 4095;
+ return xmalloc_fgets_internal(file, terminating_string, 1, &maxsz);
+}