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 #include <config.h>
  35
  36 #include <stdarg.h>
  37 #include <stdlib.h>
  38 #include "roken.h"
  39
  40 struct rk_strpool {
  41     char *str;
  42     size_t len;
  43 };
  44
  45 /*
  46  *
  47  */
  48
  49 ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
  50 rk_strpoolfree(struct rk_strpool *p)
  51 {
  52     if (p->str) {
  53         free(p->str);
  54         p->str = NULL;
  55     }
  56     free(p);
  57 }
  58
  59 /*
  60  *
  61  */
  62
  63 ROKEN_LIB_FUNCTION struct rk_strpool * ROKEN_LIB_CALL
  64 rk_strpoolprintf(struct rk_strpool *p, const char *fmt, ...)
  65 {
  66     va_list ap;
  67     char *str, *str2;
  68     int len;
  69
  70     if (p == NULL) {
  71         p = malloc(sizeof(*p));
  72         if (p == NULL)
  73             return NULL;
  74         p->str = NULL;
  75         p->len = 0;
  76     }
  77     va_start(ap, fmt);
  78     len = vasprintf(&str, fmt, ap);
  79     va_end(ap);
  80     if (str == NULL) {
  81         rk_strpoolfree(p);
  82         return NULL;
  83     }
  84     str2 = realloc(p->str, len + p->len + 1);
  85     if (str2 == NULL) {
  86         rk_strpoolfree(p);
  87         return NULL;
  88     }
  89     p->str = str2;
  90     memcpy(p->str + p->len, str, len + 1);
  91     p->len += len;
  92     free(str);
  93     return p;
  94 }
  95
  96 /*
  97  *
  98  */
  99
 100 ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
 101 rk_strpoolcollect(struct rk_strpool *p)
 102 {
 103     char *str;
 104     if (p == NULL)
 105         return strdup("");
 106     str = p->str;
 107     p->str = NULL;
 108     free(p);
 109     return str;
 110 }