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 #include <xmalloc.h>
  33
  34 #include "strbuf.h"
  35
  36 struct chunk {
  37     struct chunk *next;
  38     size_t length;
  39     char text[];
  40 };
  41
  42 struct pa_strbuf {
  43     size_t length;
  44     struct chunk *head, *tail;
  45 };
  46
  47 struct pa_strbuf *pa_strbuf_new(void) {
  48     struct pa_strbuf *sb = pa_xmalloc(sizeof(struct pa_strbuf));
  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         pa_xfree(c);
  60     }
  61
  62     pa_xfree(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 = pa_xmalloc(sb->length+1);
  71
  72     e = t;
  73     for (c = sb->head; c; c = c->next) {
  74         memcpy(e, c->text, c->length);
  75         e += c->length;
  76     }
  77
  78     *e = 0;
  79
  80     return t;
  81 }
  82
  83 char *pa_strbuf_tostring_free(struct pa_strbuf *sb) {
  84     char *t;
  85     assert(sb);
  86     t = pa_strbuf_tostring(sb);
  87     pa_strbuf_free(sb);
  88     return t;
  89 }
  90
  91 void pa_strbuf_puts(struct pa_strbuf *sb, const char *t) {
  92     assert(sb && t);
  93     pa_strbuf_putsn(sb, t, strlen(t));
  94 }
  95
  96 void pa_strbuf_putsn(struct pa_strbuf *sb, const char *t, size_t l) {
  97     struct chunk *c;
  98     assert(sb && t);
  99
 100     if (!l)
 101        return;
 102
 103     c = pa_xmalloc(sizeof(struct chunk)+l);
 104
 105     c->next = NULL;
 106     c->length = l;
 107     memcpy(c->text, t, l);
 108
 109     if (sb->tail) {
 110         assert(sb->head);
 111         sb->tail->next = c;
 112     } else {
 113         assert(!sb->head);
 114         sb->head = c;
 115     }
 116
 117     sb->tail = c;
 118     sb->length += l;
 119 }
 120
 121 /* The following is based on an example from the GNU libc documentation */
 122
 123 int pa_strbuf_printf(struct pa_strbuf *sb, const char *format, ...) {
 124     int r, size = 100;
 125     struct chunk *c = NULL;
 126
 127     assert(sb);
 128
 129     for(;;) {
 130         va_list ap;
 131
 132         c = pa_xrealloc(c, sizeof(struct chunk)+size);
 133
 134         va_start(ap, format);
 135         r = vsnprintf(c->text, size, format, ap);
 136         va_end(ap);
 137
 138         if (r > -1 && r < size) {
 139             c->length = r;
 140             c->next = NULL;
 141
 142             if (sb->tail) {
 143                 assert(sb->head);
 144                 sb->tail->next = c;
 145             } else {
 146                 assert(!sb->head);
 147                 sb->head = c;
 148             }
 149
 150             sb->tail = c;
 151             sb->length += r;
 152
 153             return r;
 154         }
 155
 156         if (r > -1)    /* glibc 2.1 */
 157             size = r+1;
 158         else           /* glibc 2.0 */
 159             size *= 2;
 160     }
 161 }