code.delx.au - pulseaudio/blob - polyp/strbuf.c

   1 /* $Id$ */
   2
   3 /***
   4   This file is part of polypaudio.
   5
   6   polypaudio is free software; you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published
   8   by the Free Software Foundation; either version 2 of the License,
   9   or (at your option) any later version.
  10
  11   polypaudio is distributed in the hope that it will be useful, but
  12   WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14   General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with polypaudio; if not, write to the Free Software
  18   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  19   USA.
  20 ***/
  21
  22 #ifdef HAVE_CONFIG_H
  23 #include <config.h>
  24 #endif
  25
  26 #include <sys/types.h>
  27 #include <stdlib.h>
  28 #include <assert.h>
  29 #include <string.h>
  30 #include <stdarg.h>
  31 #include <stdio.h>
  32
  33 #include "strbuf.h"
  34
  35 struct chunk {
  36     struct chunk *next;
  37     size_t length;
  38     char text[];
  39 };
  40
  41 struct pa_strbuf {
  42     size_t length;
  43     struct chunk *head, *tail;
  44 };
  45
  46 struct pa_strbuf *pa_strbuf_new(void) {
  47     struct pa_strbuf *sb = malloc(sizeof(struct pa_strbuf));
  48     assert(sb);
  49     sb->length = 0;
  50     sb->head = sb->tail = NULL;
  51     return sb;
  52 }
  53
  54 void pa_strbuf_free(struct pa_strbuf *sb) {
  55     assert(sb);
  56     while (sb->head) {
  57         struct chunk *c = sb->head;
  58         sb->head = sb->head->next;
  59         free(c);
  60     }
  61
  62     free(sb);
  63 }
  64
  65 char *pa_strbuf_tostring(struct pa_strbuf *sb) {
  66     char *t, *e;
  67     struct chunk *c;
  68     assert(sb);
  69
  70     t = malloc(sb->length+1);
  71     assert(t);
  72
  73     e = t;
  74     for (c = sb->head; c; c = c->next) {
  75         memcpy(e, c->text, c->length);
  76         e += c->length;
  77     }
  78
  79     *e = 0;
  80
  81     return t;
  82 }
  83
  84 char *pa_strbuf_tostring_free(struct pa_strbuf *sb) {
  85     char *t;
  86     assert(sb);
  87     t = pa_strbuf_tostring(sb);
  88     pa_strbuf_free(sb);
  89     return t;
  90 }
  91
  92 void pa_strbuf_puts(struct pa_strbuf *sb, const char *t) {
  93     assert(sb && t);
  94     pa_strbuf_putsn(sb, t, strlen(t));
  95 }
  96
  97 void pa_strbuf_putsn(struct pa_strbuf *sb, const char *t, size_t l) {
  98     struct chunk *c;
  99     assert(sb && t);
 100
 101     if (!l)
 102        return;
 103
 104     c = malloc(sizeof(struct chunk)+l);
 105     assert(c);
 106
 107     c->next = NULL;
 108     c->length = l;
 109     memcpy(c->text, t, l);
 110
 111     if (sb->tail) {
 112         assert(sb->head);
 113         sb->tail->next = c;
 114     } else {
 115         assert(!sb->head);
 116         sb->head = c;
 117     }
 118
 119     sb->tail = c;
 120     sb->length += l;
 121 }
 122
 123 /* The following is based on an example from the GNU libc documentation */
 124
 125 int pa_strbuf_printf(struct pa_strbuf *sb, const char *format, ...) {
 126     int r, size = 100;
 127     struct chunk *c = NULL;
 128
 129     assert(sb);
 130
 131     for(;;) {
 132         va_list ap;
 133
 134         c = realloc(c, sizeof(struct chunk)+size);
 135         assert(c);
 136
 137         va_start(ap, format);
 138         r = vsnprintf(c->text, size, format, ap);
 139         va_end(ap);
 140
 141         if (r > -1 && r < size) {
 142             c->length = r;
 143             c->next = NULL;
 144
 145             if (sb->tail) {
 146                 assert(sb->head);
 147                 sb->tail->next = c;
 148             } else {
 149                 assert(!sb->head);
 150                 sb->head = c;
 151             }
 152
 153             sb->tail = c;
 154             sb->length += r;
 155
 156             return r;
 157         }
 158
 159         if (r > -1)    /* glibc 2.1 */
 160             size = r+1;
 161         else           /* glibc 2.0 */
 162             size *= 2;
 163     }
 164 }