source: MondoRescue/branches/stable/mindi-busybox/libbb/get_line_from_file.c @ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 14 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 1.5 KB
Line 
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 <stdio.h>
13#include <stdlib.h>
14#include "libbb.h"
15
16/* get_line_from_file() - This function reads an entire line from a text file,
17 * up to a newline or NUL byte.  It returns a malloc'ed char * which must be
18 * stored and free'ed  by the caller.  If end is null '\n' isn't considered
19 * and of line.  If end isn't null, length of the chunk read is stored in it. */
20
21char *bb_get_chunk_from_file(FILE * file, int *end)
22{
23    int ch;
24    int idx = 0;
25    char *linebuf = NULL;
26    int linebufsz = 0;
27
28    while ((ch = getc(file)) != EOF) {
29        /* grow the line buffer as necessary */
30        if (idx > linebufsz - 2) {
31            linebuf = xrealloc(linebuf, linebufsz += 80);
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        if (ferror(file)) {
41            free(linebuf);
42            return NULL;
43        }
44        linebuf[idx] = 0;
45    }
46    return linebuf;
47}
48
49/* Get line, including trailing /n if any */
50char *bb_get_line_from_file(FILE * file)
51{
52    int i;
53
54    return bb_get_chunk_from_file(file, &i);
55}
56
57/* Get line.  Remove trailing /n */
58char *bb_get_chomped_line_from_file(FILE * file)
59{
60    int i;
61    char *c = bb_get_chunk_from_file(file, &i);
62
63    if (i && c[--i] == '\n')
64        c[i] = 0;
65
66    return c;
67}
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