lib/roken/strpool.c

   1 /*
   2  * Copyright (c) 2005 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 RCSID("$Id$");
  37 #endif
  38
  39 #include <stdarg.h>
  40 #include <stdlib.h>
  41 #include "roken.h"
  42
  43 struct rk_strpool {
  44     char *str;
  45     size_t len;
  46 };
  47
  48 /*
  49  *
  50  */
  51
  52 void ROKEN_LIB_FUNCTION
  53 rk_strpoolfree(struct rk_strpool *p)
  54 {
  55     if (p->str) {
  56         free(p->str);
  57         p->str = NULL;
  58     }
  59     free(p);
  60 }
  61
  62 /*
  63  *
  64  */
  65
  66 struct rk_strpool * ROKEN_LIB_FUNCTION
  67 rk_strpoolprintf(struct rk_strpool *p, const char *fmt, ...)
  68 {
  69     va_list ap;
  70     char *str, *str2;
  71     int len;
  72
  73     if (p == NULL) {
  74         p = malloc(sizeof(*p));
  75         if (p == NULL)
  76             return NULL;
  77         p->str = NULL;
  78         p->len = 0;
  79     }
  80     va_start(ap, fmt);
  81     len = vasprintf(&str, fmt, ap);
  82     va_end(ap);
  83     if (str == NULL) {
  84         rk_strpoolfree(p);
  85         return NULL;
  86     }
  87     str2 = realloc(p->str, len + p->len + 1);
  88     if (str2 == NULL) {
  89         rk_strpoolfree(p);
  90         return NULL;
  91     }
  92     p->str = str2;
  93     memcpy(p->str + p->len, str, len + 1);
  94     p->len += len;
  95     free(str);
  96     return p;
  97 }
  98
  99 /*
 100  *
 101  */
 102
 103 char * ROKEN_LIB_FUNCTION
 104 rk_strpoolcollect(struct rk_strpool *p)
 105 {
 106     char *str = p->str;
 107     p->str = NULL;
 108     free(p);
 109     return str;
 110 }