1/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
5 * Copyright (C) 2005, 2006 Rob Landley <rob@landley.net>
6 * Copyright (C) 2004 Erik Andersen <andersen@codepoet.org>
7 * Copyright (C) 2001 Matt Krai
8 *
9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10 */
11
12#include "libbb.h"
13
14/* This function reads an entire line from a text file, up to a newline
15 * or NUL byte, inclusive.  It returns a malloc'ed char * which must be
16 * stored and free'ed by the caller.  If end is NULL '\n' isn't considered
17 * end of line.  If end isn't NULL, length of the chunk read is stored in it.
18 * Return NULL if EOF/error */
19
20char *bb_get_chunk_from_file(FILE *file, int *end)
21{
22	int ch;
23	int idx = 0;
24	char *linebuf = NULL;
25	int linebufsz = 0;
26
27	while ((ch = getc(file)) != EOF) {
28		/* grow the line buffer as necessary */
29		if (idx >= linebufsz) {
30			linebufsz += 80;
31			linebuf = xrealloc(linebuf, linebufsz);
32		}
33		linebuf[idx++] = (char) ch;
34		if (!ch || (end && ch == '\n'))
35			break;
36	}
37	if (end)
38		*end = idx;
39	if (linebuf) {
40		// huh, does fgets discard prior data on error like this?
41		// I don't think so....
42		//if (ferror(file)) {
43		//	free(linebuf);
44		//	return NULL;
45		//}
46		linebuf = xrealloc(linebuf, idx+1);
47		linebuf[idx] = '\0';
48	}
49	return linebuf;
50}
51
52/* Get line, including trailing \n if any */
53char *xmalloc_fgets(FILE *file)
54{
55	int i;
56
57	return bb_get_chunk_from_file(file, &i);
58}
59
60/* Get line.  Remove trailing \n */
61char *xmalloc_getline(FILE *file)
62{
63	int i;
64	char *c = bb_get_chunk_from_file(file, &i);
65
66	if (i && c[--i] == '\n')
67		c[i] = '\0';
68
69	return c;
70}
71