Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * Utility routines. |
| 4 | * |
Rob Landley | 2b26fd5 | 2006-02-24 02:30:39 +0000 | [diff] [blame] | 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 |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 8 | * |
Rob Landley | 2b26fd5 | 2006-02-24 02:30:39 +0000 | [diff] [blame] | 9 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 10 | */ |
| 11 | |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 12 | #include "libbb.h" |
| 13 | |
Denis Vlasenko | f7996f3 | 2007-01-11 17:20:00 +0000 | [diff] [blame] | 14 | /* This function reads an entire line from a text file, up to a newline |
Denis Vlasenko | abee3d0 | 2007-12-26 20:44:45 +0000 | [diff] [blame^] | 15 | * 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 Vlasenko | ef44d9d | 2007-01-17 23:16:16 +0000 | [diff] [blame] | 17 | * end of line. If end isn't NULL, length of the chunk read is stored in it. |
| 18 | * Return NULL if EOF/error */ |
Denis Vlasenko | 51742f4 | 2007-04-12 00:32:05 +0000 | [diff] [blame] | 19 | char *bb_get_chunk_from_file(FILE *file, int *end) |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 20 | { |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 21 | int ch; |
| 22 | int idx = 0; |
| 23 | char *linebuf = NULL; |
| 24 | int linebufsz = 0; |
| 25 | |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 26 | while ((ch = getc(file)) != EOF) { |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 27 | /* grow the line buffer as necessary */ |
Denis Vlasenko | 8b22b07 | 2006-12-02 17:58:10 +0000 | [diff] [blame] | 28 | if (idx >= linebufsz) { |
Denis Vlasenko | 51742f4 | 2007-04-12 00:32:05 +0000 | [diff] [blame] | 29 | linebufsz += 80; |
| 30 | linebuf = xrealloc(linebuf, linebufsz); |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 31 | } |
Bernhard Reutner-Fischer | 2d1a6e7 | 2006-06-10 11:04:43 +0000 | [diff] [blame] | 32 | linebuf[idx++] = (char) ch; |
| 33 | if (!ch || (end && ch == '\n')) |
| 34 | break; |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 35 | } |
Bernhard Reutner-Fischer | 2d1a6e7 | 2006-06-10 11:04:43 +0000 | [diff] [blame] | 36 | if (end) |
| 37 | *end = idx; |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 38 | if (linebuf) { |
Denis Vlasenko | 8b22b07 | 2006-12-02 17:58:10 +0000 | [diff] [blame] | 39 | // huh, does fgets discard prior data on error like this? |
Denis Vlasenko | ab24e18 | 2006-11-30 16:41:15 +0000 | [diff] [blame] | 40 | // I don't think so.... |
| 41 | //if (ferror(file)) { |
| 42 | // free(linebuf); |
| 43 | // return NULL; |
| 44 | //} |
Denis Vlasenko | 372686b | 2006-10-12 22:42:33 +0000 | [diff] [blame] | 45 | linebuf = xrealloc(linebuf, idx+1); |
Denis Vlasenko | 8b22b07 | 2006-12-02 17:58:10 +0000 | [diff] [blame] | 46 | linebuf[idx] = '\0'; |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 47 | } |
Eric Andersen | aad1a88 | 2001-03-16 22:47:14 +0000 | [diff] [blame] | 48 | return linebuf; |
| 49 | } |
| 50 | |
Denis Vlasenko | b97c984 | 2006-10-01 21:05:12 +0000 | [diff] [blame] | 51 | /* Get line, including trailing \n if any */ |
Denis Vlasenko | 51742f4 | 2007-04-12 00:32:05 +0000 | [diff] [blame] | 52 | char *xmalloc_fgets(FILE *file) |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 53 | { |
Rob Landley | 2b26fd5 | 2006-02-24 02:30:39 +0000 | [diff] [blame] | 54 | int i; |
Bernhard Reutner-Fischer | 2d1a6e7 | 2006-06-10 11:04:43 +0000 | [diff] [blame] | 55 | |
Rob Landley | 2b26fd5 | 2006-02-24 02:30:39 +0000 | [diff] [blame] | 56 | return bb_get_chunk_from_file(file, &i); |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 57 | } |
| 58 | |
Denis Vlasenko | b97c984 | 2006-10-01 21:05:12 +0000 | [diff] [blame] | 59 | /* Get line. Remove trailing \n */ |
Denis Vlasenko | 51742f4 | 2007-04-12 00:32:05 +0000 | [diff] [blame] | 60 | char *xmalloc_getline(FILE *file) |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 61 | { |
Rob Landley | 2b26fd5 | 2006-02-24 02:30:39 +0000 | [diff] [blame] | 62 | int i; |
Bernhard Reutner-Fischer | 2d1a6e7 | 2006-06-10 11:04:43 +0000 | [diff] [blame] | 63 | char *c = bb_get_chunk_from_file(file, &i); |
| 64 | |
| 65 | if (i && c[--i] == '\n') |
Denis Vlasenko | 9a7cef9 | 2006-12-20 02:46:48 +0000 | [diff] [blame] | 66 | c[i] = '\0'; |
Bernhard Reutner-Fischer | 2d1a6e7 | 2006-06-10 11:04:43 +0000 | [diff] [blame] | 67 | |
Rob Landley | 2b26fd5 | 2006-02-24 02:30:39 +0000 | [diff] [blame] | 68 | return c; |
Manuel Novoa III | cad5364 | 2003-03-19 09:13:01 +0000 | [diff] [blame] | 69 | } |