blob: b88872d531b6774e775086708d1ddef0d8abfb65 [file] [log] [blame]
Eric Andersenaad1a882001-03-16 22:47:14 +00001/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
Rob Landley2b26fd52006-02-24 02:30:39 +00005 * Copyright (C) 2005, 2006 Rob Landley <rob@landley.net>
6 * Copyright (C) 2004 Erik Andersen <andersen@codepoet.org>
7 * Copyright (C) 2001 Matt Krai
Eric Andersenaad1a882001-03-16 22:47:14 +00008 *
Rob Landley2b26fd52006-02-24 02:30:39 +00009 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
Eric Andersenaad1a882001-03-16 22:47:14 +000010 */
11
Eric Andersenaad1a882001-03-16 22:47:14 +000012#include "libbb.h"
13
Denis Vlasenkof7996f32007-01-11 17:20:00 +000014/* This function reads an entire line from a text file, up to a newline
Denis Vlasenkoabee3d02007-12-26 20:44:45 +000015 * or NUL byte, inclusive. It returns a malloc'ed char * which
16 * must be free'ed by the caller. If end is NULL '\n' isn't considered
Denis Vlasenkoef44d9d2007-01-17 23:16:16 +000017 * end of line. If end isn't NULL, length of the chunk read is stored in it.
18 * Return NULL if EOF/error */
Denis Vlasenko51742f42007-04-12 00:32:05 +000019char *bb_get_chunk_from_file(FILE *file, int *end)
Eric Andersenaad1a882001-03-16 22:47:14 +000020{
Eric Andersenaad1a882001-03-16 22:47:14 +000021 int ch;
22 int idx = 0;
23 char *linebuf = NULL;
24 int linebufsz = 0;
25
Manuel Novoa III cad53642003-03-19 09:13:01 +000026 while ((ch = getc(file)) != EOF) {
Eric Andersenaad1a882001-03-16 22:47:14 +000027 /* grow the line buffer as necessary */
Denis Vlasenko8b22b072006-12-02 17:58:10 +000028 if (idx >= linebufsz) {
Denis Vlasenko51742f42007-04-12 00:32:05 +000029 linebufsz += 80;
30 linebuf = xrealloc(linebuf, linebufsz);
Manuel Novoa III cad53642003-03-19 09:13:01 +000031 }
Bernhard Reutner-Fischer2d1a6e72006-06-10 11:04:43 +000032 linebuf[idx++] = (char) ch;
33 if (!ch || (end && ch == '\n'))
34 break;
Eric Andersenaad1a882001-03-16 22:47:14 +000035 }
Bernhard Reutner-Fischer2d1a6e72006-06-10 11:04:43 +000036 if (end)
37 *end = idx;
Manuel Novoa III cad53642003-03-19 09:13:01 +000038 if (linebuf) {
Denis Vlasenko8b22b072006-12-02 17:58:10 +000039 // huh, does fgets discard prior data on error like this?
Denis Vlasenkoab24e182006-11-30 16:41:15 +000040 // I don't think so....
41 //if (ferror(file)) {
42 // free(linebuf);
43 // return NULL;
44 //}
Denis Vlasenko372686b2006-10-12 22:42:33 +000045 linebuf = xrealloc(linebuf, idx+1);
Denis Vlasenko8b22b072006-12-02 17:58:10 +000046 linebuf[idx] = '\0';
Manuel Novoa III cad53642003-03-19 09:13:01 +000047 }
Eric Andersenaad1a882001-03-16 22:47:14 +000048 return linebuf;
49}
50
Denis Vlasenkob97c9842006-10-01 21:05:12 +000051/* Get line, including trailing \n if any */
Denis Vlasenko51742f42007-04-12 00:32:05 +000052char *xmalloc_fgets(FILE *file)
Manuel Novoa III cad53642003-03-19 09:13:01 +000053{
Rob Landley2b26fd52006-02-24 02:30:39 +000054 int i;
Bernhard Reutner-Fischer2d1a6e72006-06-10 11:04:43 +000055
Rob Landley2b26fd52006-02-24 02:30:39 +000056 return bb_get_chunk_from_file(file, &i);
Manuel Novoa III cad53642003-03-19 09:13:01 +000057}
58
Denis Vlasenkob97c9842006-10-01 21:05:12 +000059/* Get line. Remove trailing \n */
Denis Vlasenko8ee649a2008-03-26 20:04:27 +000060char *xmalloc_fgetline(FILE *file)
Manuel Novoa III cad53642003-03-19 09:13:01 +000061{
Rob Landley2b26fd52006-02-24 02:30:39 +000062 int i;
Bernhard Reutner-Fischer2d1a6e72006-06-10 11:04:43 +000063 char *c = bb_get_chunk_from_file(file, &i);
64
65 if (i && c[--i] == '\n')
Denis Vlasenko9a7cef92006-12-20 02:46:48 +000066 c[i] = '\0';
Bernhard Reutner-Fischer2d1a6e72006-06-10 11:04:43 +000067
Rob Landley2b26fd52006-02-24 02:30:39 +000068 return c;
Manuel Novoa III cad53642003-03-19 09:13:01 +000069}