lib/roken/concat.c

   1 /*
   2  * Copyright (c) 1995, 1996, 1997 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 "roken.h"
  37
  38 int ROKEN_LIB_FUNCTION
  39 roken_concat (char *s, size_t len, ...)
  40 {
  41     int ret;
  42     va_list args;
  43
  44     va_start(args, len);
  45     ret = roken_vconcat (s, len, args);
  46     va_end(args);
  47     return ret;
  48 }
  49
  50 int ROKEN_LIB_FUNCTION
  51 roken_vconcat (char *s, size_t len, va_list args)
  52 {
  53     const char *a;
  54
  55     while ((a = va_arg(args, const char*))) {
  56         size_t n = strlen (a);
  57
  58         if (n >= len)
  59             return -1;
  60         memcpy (s, a, n);
  61         s += n;
  62         len -= n;
  63     }
  64     *s = '\0';
  65     return 0;
  66 }
  67
  68 size_t ROKEN_LIB_FUNCTION
  69 roken_vmconcat (char **s, size_t max_len, va_list args)
  70 {
  71     const char *a;
  72     char *p, *q;
  73     size_t len = 0;
  74     *s = NULL;
  75     p = malloc(1);
  76     if(p == NULL)
  77         return 0;
  78     len = 1;
  79     while ((a = va_arg(args, const char*))) {
  80         size_t n = strlen (a);
  81
  82         if(max_len && len + n > max_len){
  83             free(p);
  84             return 0;
  85         }
  86         q = realloc(p, len + n);
  87         if(q == NULL){
  88             free(p);
  89             return 0;
  90         }
  91         p = q;
  92         memcpy (p + len - 1, a, n);
  93         len += n;
  94     }
  95     p[len - 1] = '\0';
  96     *s = p;
  97     return len;
  98 }
  99
 100 size_t ROKEN_LIB_FUNCTION
 101 roken_mconcat (char **s, size_t max_len, ...)
 102 {
 103     int ret;
 104     va_list args;
 105
 106     va_start(args, max_len);
 107     ret = roken_vmconcat (s, max_len, args);
 108     va_end(args);
 109     return ret;
 110 }