crypto/heimdal-0.6.3/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 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 RCSID("$Id: concat.c,v 1.4 1999/12/02 16:58:45 joda Exp $");
  37 #endif
  38 #include "roken.h"
  39
  40 int
  41 roken_concat (char *s, size_t len, ...)
  42 {
  43     int ret;
  44     va_list args;
  45
  46     va_start(args, len);
  47     ret = roken_vconcat (s, len, args);
  48     va_end(args);
  49     return ret;
  50 }
  51
  52 int
  53 roken_vconcat (char *s, size_t len, va_list args)
  54 {
  55     const char *a;
  56
  57     while ((a = va_arg(args, const char*))) {
  58         size_t n = strlen (a);
  59
  60         if (n >= len)
  61             return -1;
  62         memcpy (s, a, n);
  63         s += n;
  64         len -= n;
  65     }
  66     *s = '\0';
  67     return 0;
  68 }
  69
  70 size_t
  71 roken_vmconcat (char **s, size_t max_len, va_list args)
  72 {
  73     const char *a;
  74     char *p, *q;
  75     size_t len = 0;
  76     *s = NULL;
  77     p = malloc(1);
  78     if(p == NULL)
  79         return 0;
  80     len = 1;
  81     while ((a = va_arg(args, const char*))) {
  82         size_t n = strlen (a);
  83
  84         if(max_len && len + n > max_len){
  85             free(p);
  86             return 0;
  87         }
  88         q = realloc(p, len + n);
  89         if(q == NULL){
  90             free(p);
  91             return 0;
  92         }
  93         p = q;
  94         memcpy (p + len - 1, a, n);
  95         len += n;
  96     }
  97     p[len - 1] = '\0';
  98     *s = p;
  99     return len;
 100 }
 101
 102 size_t
 103 roken_mconcat (char **s, size_t max_len, ...)
 104 {
 105     int ret;
 106     va_list args;
 107
 108     va_start(args, max_len);
 109     ret = roken_vmconcat (s, max_len, args);
 110     va_end(args);
 111     return ret;
 112 }