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; /* strlen() of str */
  43     size_t sz;  /* Allocated size */
  44 };
  45
  46 /*
  47  *
  48  */
  49
  50 ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
  51 rk_strpoolfree(struct rk_strpool *p)
  52 {
  53     if (p && p->str) {
  54         free(p->str);
  55         p->str = NULL;
  56     }
  57     free(p);
  58 }
  59
  60 /*
  61  *
  62  */
  63
  64 ROKEN_LIB_FUNCTION struct rk_strpool * ROKEN_LIB_CALL
  65 rk_strpoolprintf(struct rk_strpool *p, const char *fmt, ...)
  66 {
  67     va_list ap;
  68     char *str;
  69     int len;
  70
  71     va_start(ap, fmt);
  72     len = vasprintf(&str, fmt, ap);
  73     va_end(ap);
  74     if (str == NULL)
  75         return rk_strpoolfree(p), NULL;
  76
  77     if (p == NULL) {
  78         if ((p = malloc(sizeof(*p))) == NULL)
  79             return free(str), NULL;
  80         p->str = str;
  81         p->len = p->sz = len;
  82         return p;
  83     } /* else grow the buffer and append `str', but don't grow too fast */
  84
  85     if (len + p->len + 1 > p->sz) {
  86         size_t sz = p->len + len + 9 + (p->sz >> 2);
  87         char *str2;
  88
  89         if ((str2 = realloc(p->str, sz)) == NULL)
  90             return rk_strpoolfree(p), NULL;
  91         p->str = str2;
  92         p->sz = sz;
  93     }
  94     memcpy(p->str + p->len, str, len + 1);
  95     p->len += len;
  96     free(str);
  97     return p;
  98 }
  99
 100 /*
 101  *
 102  */
 103
 104 ROKEN_LIB_FUNCTION char * ROKEN_LIB_CALL
 105 rk_strpoolcollect(struct rk_strpool *p)
 106 {
 107     char *str;
 108     if (p == NULL)
 109         return strdup("");
 110     str = p->str;
 111     p->str = NULL;
 112     free(p);
 113     return str;
 114 }