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-rw-r--r--libbb/fgets_str.c53
1 files changed, 53 insertions, 0 deletions
diff --git a/libbb/fgets_str.c b/libbb/fgets_str.c
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1/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
5 * Copyright (C) many different people.
6 * If you wrote this, please acknowledge your work.
7 *
8 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
9 */
10
11#include "libbb.h"
12
13/* Read up to (and including) TERMINATING_STRING from FILE and return it.
14 * Return NULL on EOF. */
15
16char *xmalloc_fgets_str(FILE *file, const char *terminating_string)
17{
18 char *linebuf = NULL;
19 const int term_length = strlen(terminating_string);
20 int end_string_offset;
21 int linebufsz = 0;
22 int idx = 0;
23 int ch;
24
25 while (1) {
26 ch = fgetc(file);
27 if (ch == EOF) {
28 free(linebuf);
29 return NULL;
30 }
31
32 /* grow the line buffer as necessary */
33 while (idx > linebufsz - 2) {
34 linebufsz += 200;
35 linebuf = xrealloc(linebuf, linebufsz);
36 }
37
38 linebuf[idx] = ch;
39 idx++;
40
41 /* Check for terminating string */
42 end_string_offset = idx - term_length;
43 if (end_string_offset > 0
44 && memcmp(&linebuf[end_string_offset], terminating_string, term_length) == 0
45 ) {
46 idx -= term_length;
47 break;
48 }
49 }
50 linebuf = xrealloc(linebuf, idx + 1);
51 linebuf[idx] = '\0';
52 return linebuf;
53}