Michael Clark | f0d0888 | 2007-03-13 08:26:18 +0000 | [diff] [blame] | 1 | /* |
Michael Clark | f6a6e48 | 2007-03-13 08:26:23 +0000 | [diff] [blame] | 2 | * $Id: printbuf.c,v 1.5 2006/01/26 02:16:28 mclark Exp $ |
Michael Clark | f0d0888 | 2007-03-13 08:26:18 +0000 | [diff] [blame] | 3 | * |
Michael Clark | f6a6e48 | 2007-03-13 08:26:23 +0000 | [diff] [blame] | 4 | * Copyright (c) 2004, 2005 Metaparadigm Pte. Ltd. |
Michael Clark | f0d0888 | 2007-03-13 08:26:18 +0000 | [diff] [blame] | 5 | * Michael Clark <michael@metaparadigm.com> |
| 6 | * |
Michael Clark | f6a6e48 | 2007-03-13 08:26:23 +0000 | [diff] [blame] | 7 | * This library is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the MIT license. See COPYING for details. |
Michael Clark | f0d0888 | 2007-03-13 08:26:18 +0000 | [diff] [blame] | 9 | * |
| 10 | */ |
| 11 | |
Michael Clark | 4504df7 | 2007-03-13 08:26:20 +0000 | [diff] [blame] | 12 | #include "config.h" |
| 13 | |
Michael Clark | f0d0888 | 2007-03-13 08:26:18 +0000 | [diff] [blame] | 14 | #include <stdio.h> |
| 15 | #include <stdlib.h> |
Michael Clark | f0d0888 | 2007-03-13 08:26:18 +0000 | [diff] [blame] | 16 | #include <string.h> |
| 17 | |
Michael Clark | 4504df7 | 2007-03-13 08:26:20 +0000 | [diff] [blame] | 18 | #if HAVE_STDARG_H |
| 19 | # include <stdarg.h> |
| 20 | #else /* !HAVE_STDARG_H */ |
| 21 | # error Not enough var arg support! |
| 22 | #endif /* HAVE_STDARG_H */ |
| 23 | |
Michael Clark | f0d0888 | 2007-03-13 08:26:18 +0000 | [diff] [blame] | 24 | #include "bits.h" |
| 25 | #include "debug.h" |
| 26 | #include "printbuf.h" |
| 27 | |
Michael Clark | e8de078 | 2009-02-25 01:45:00 +0000 | [diff] [blame^] | 28 | struct printbuf* printbuf_new(void) |
Michael Clark | f0d0888 | 2007-03-13 08:26:18 +0000 | [diff] [blame] | 29 | { |
| 30 | struct printbuf *p; |
| 31 | |
| 32 | if(!(p = calloc(1, sizeof(struct printbuf)))) return NULL; |
| 33 | p->size = 32; |
| 34 | p->bpos = 0; |
| 35 | if(!(p->buf = malloc(p->size))) { |
| 36 | free(p); |
| 37 | return NULL; |
| 38 | } |
| 39 | return p; |
| 40 | } |
| 41 | |
| 42 | |
Michael Clark | 68cafad | 2009-01-06 22:56:57 +0000 | [diff] [blame] | 43 | int printbuf_memappend(struct printbuf *p, const char *buf, int size) |
Michael Clark | f0d0888 | 2007-03-13 08:26:18 +0000 | [diff] [blame] | 44 | { |
| 45 | char *t; |
| 46 | if(p->size - p->bpos <= size) { |
| 47 | int new_size = max(p->size * 2, p->bpos + size + 8); |
Michael Clark | 4504df7 | 2007-03-13 08:26:20 +0000 | [diff] [blame] | 48 | #ifdef PRINTBUF_DEBUG |
Michael Clark | dfaf670 | 2007-10-25 02:26:00 +0000 | [diff] [blame] | 49 | MC_DEBUG("printbuf_memappend: realloc " |
Michael Clark | f0d0888 | 2007-03-13 08:26:18 +0000 | [diff] [blame] | 50 | "bpos=%d wrsize=%d old_size=%d new_size=%d\n", |
| 51 | p->bpos, size, p->size, new_size); |
Michael Clark | 4504df7 | 2007-03-13 08:26:20 +0000 | [diff] [blame] | 52 | #endif /* PRINTBUF_DEBUG */ |
Michael Clark | f0d0888 | 2007-03-13 08:26:18 +0000 | [diff] [blame] | 53 | if(!(t = realloc(p->buf, new_size))) return -1; |
| 54 | p->size = new_size; |
| 55 | p->buf = t; |
| 56 | } |
| 57 | memcpy(p->buf + p->bpos, buf, size); |
| 58 | p->bpos += size; |
| 59 | p->buf[p->bpos]= '\0'; |
| 60 | return size; |
| 61 | } |
| 62 | |
Michael Clark | 4504df7 | 2007-03-13 08:26:20 +0000 | [diff] [blame] | 63 | #if !HAVE_VSNPRINTF && defined(WIN32) |
| 64 | # define vsnprintf _vsnprintf |
| 65 | #elif !HAVE_VSNPRINTF /* !HAVE_VSNPRINTF */ |
| 66 | # error Need vsnprintf! |
| 67 | #endif /* !HAVE_VSNPRINTF && defined(WIN32) */ |
| 68 | |
| 69 | #if !HAVE_VASPRINTF |
| 70 | /* CAW: compliant version of vasprintf */ |
| 71 | static int vasprintf(char **buf, const char *fmt, va_list ap) |
| 72 | { |
| 73 | #ifndef WIN32 |
| 74 | static char _T_emptybuffer = '\0'; |
| 75 | #endif /* !defined(WIN32) */ |
| 76 | int chars; |
| 77 | char *b; |
| 78 | |
| 79 | if(!buf) { return -1; } |
| 80 | |
| 81 | #ifdef WIN32 |
| 82 | chars = _vscprintf(fmt, ap)+1; |
| 83 | #else /* !defined(WIN32) */ |
| 84 | /* CAW: RAWR! We have to hope to god here that vsnprintf doesn't overwrite |
| 85 | our buffer like on some 64bit sun systems.... but hey, its time to move on */ |
| 86 | chars = vsnprintf(&_T_emptybuffer, 0, fmt, ap)+1; |
| 87 | if(chars < 0) { chars *= -1; } /* CAW: old glibc versions have this problem */ |
| 88 | #endif /* defined(WIN32) */ |
| 89 | |
| 90 | b = (char*)malloc(sizeof(char)*chars); |
| 91 | if(!b) { return -1; } |
| 92 | |
| 93 | if((chars = vsprintf(b, fmt, ap)) < 0) |
| 94 | { |
| 95 | free(b); |
| 96 | } else { |
| 97 | *buf = b; |
| 98 | } |
| 99 | |
| 100 | return chars; |
| 101 | } |
| 102 | #endif /* !HAVE_VASPRINTF */ |
Michael Clark | f0d0888 | 2007-03-13 08:26:18 +0000 | [diff] [blame] | 103 | |
| 104 | int sprintbuf(struct printbuf *p, const char *msg, ...) |
| 105 | { |
| 106 | va_list ap; |
| 107 | char *t; |
| 108 | int size; |
| 109 | char buf[128]; |
| 110 | |
| 111 | /* user stack buffer first */ |
| 112 | va_start(ap, msg); |
| 113 | size = vsnprintf(buf, 128, msg, ap); |
| 114 | va_end(ap); |
| 115 | /* if string is greater than stack buffer, then use dynamic string |
| 116 | with vasprintf. Note: some implementation of vsnprintf return -1 |
| 117 | if output is truncated whereas some return the number of bytes that |
Michael Clark | 4504df7 | 2007-03-13 08:26:20 +0000 | [diff] [blame] | 118 | would have been writen - this code handles both cases. */ |
Michael Clark | f0d0888 | 2007-03-13 08:26:18 +0000 | [diff] [blame] | 119 | if(size == -1 || size > 127) { |
| 120 | int ret; |
| 121 | va_start(ap, msg); |
Michael Clark | 8cdac64 | 2009-01-05 03:57:59 +0000 | [diff] [blame] | 122 | size = vasprintf(&t, msg, ap); |
Michael Clark | f0d0888 | 2007-03-13 08:26:18 +0000 | [diff] [blame] | 123 | va_end(ap); |
Michael Clark | 8cdac64 | 2009-01-05 03:57:59 +0000 | [diff] [blame] | 124 | if(size == -1) return -1; |
Michael Clark | f0d0888 | 2007-03-13 08:26:18 +0000 | [diff] [blame] | 125 | ret = printbuf_memappend(p, t, size); |
| 126 | free(t); |
| 127 | return ret; |
| 128 | } else { |
| 129 | return printbuf_memappend(p, buf, size); |
| 130 | } |
| 131 | } |
| 132 | |
Michael Clark | f0d0888 | 2007-03-13 08:26:18 +0000 | [diff] [blame] | 133 | void printbuf_reset(struct printbuf *p) |
| 134 | { |
| 135 | p->buf[0] = '\0'; |
| 136 | p->bpos = 0; |
| 137 | } |
| 138 | |
| 139 | void printbuf_free(struct printbuf *p) |
| 140 | { |
| 141 | if(p) { |
| 142 | free(p->buf); |
| 143 | free(p); |
| 144 | } |
| 145 | } |