busybox/libbb/fgets_str.c

/* vi: set sw=4 ts=4: */
/*
 * Utility routines.
 *
 * Copyright (C) many different people.
 * If you wrote this, please acknowledge your work.
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include "libbb.h"

static char *xmalloc_fgets_internal(FILE *file, const char *terminating_string, int chop_off)
{
	char *linebuf = NULL;
	const int term_length = strlen(terminating_string);
	int end_string_offset;
	int linebufsz = 0;
	int idx = 0;
	int ch;

	while (1) {
		ch = fgetc(file);
		if (ch == EOF) {
			if (idx == 0)
				return linebuf; /* NULL */
			break;
		}

		if (idx >= linebufsz) {
			linebufsz += 200;
			linebuf = xrealloc(linebuf, linebufsz);
		}

		linebuf[idx] = ch;
		idx++;

		/* 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
		) {
			if (chop_off)
				idx -= term_length;
			break;
		}
	}
	/* Grow/shrink *first*, then store NUL */
	linebuf = xrealloc(linebuf, idx + 1);
	linebuf[idx] = '\0';
	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)
{
	return xmalloc_fgets_internal(file, terminating_string, 0);
}

char* FAST_FUNC xmalloc_fgetline_str(FILE *file, const char *terminating_string)
{
	return xmalloc_fgets_internal(file, terminating_string, 1);
}
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	static char xmalloc_fgets_internal(FILE file, const char *terminating_string, int chop_off)
14	{
15	char *linebuf = NULL;
16	const int term_length = strlen(terminating_string);
17	int end_string_offset;
18	int linebufsz = 0;
19	int idx = 0;
20	int ch;
21
22	while (1) {
23	ch = fgetc(file);
24	if (ch == EOF) {
25	if (idx == 0)
26	return linebuf; /* NULL */
27	break;
28	}
29
30	if (idx >= linebufsz) {
31	linebufsz += 200;
32	linebuf = xrealloc(linebuf, linebufsz);
33	}
34
35	linebuf[idx] = ch;
36	idx++;
37
38	/* Check for terminating string */
39	end_string_offset = idx - term_length;
40	if (end_string_offset >= 0
41	&& memcmp(&linebuf[end_string_offset], terminating_string, term_length) == 0
42	) {
43	if (chop_off)
44	idx -= term_length;
45	break;
46	}
47	}
48	/* Grow/shrink first, then store NUL */
49	linebuf = xrealloc(linebuf, idx + 1);
50	linebuf[idx] = '\0';
51	return linebuf;
52	}
53
54	/* Read up to TERMINATING_STRING from FILE and return it,
55	* including terminating string.
56	* Non-terminated string can be returned if EOF is reached.
57	* Return NULL if EOF is reached immediately. */
58	char* FAST_FUNC xmalloc_fgets_str(FILE file, const char terminating_string)
59	{
60	return xmalloc_fgets_internal(file, terminating_string, 0);
61	}
62
63	char* FAST_FUNC xmalloc_fgetline_str(FILE file, const char terminating_string)
64	{
65	return xmalloc_fgets_internal(file, terminating_string, 1);
66	}