crypto/external/bsd/heimdal/dist/lib/roken/strcollect.c

   1 /*      $NetBSD: strcollect.c,v 1.1.1.1 2011/04/13 18:15:43 elric Exp $ */
   2
   3 /*
   4  * Copyright (c) 1998, 1999 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <config.h>
  37
  38 #include <stdarg.h>
  39 #include <stdlib.h>
  40 #include <string.h>
  41 #include <errno.h>
  42 #include <krb5/roken.h>
  43
  44 enum { initial = 10, increment = 5 };
  45
  46 static char **
  47 sub (char **argv, int i, int argc, va_list *ap)
  48 {
  49     do {
  50         if(i == argc) {
  51             /* realloc argv */
  52             char **tmp = realloc(argv, (argc + increment) * sizeof(*argv));
  53             if(tmp == NULL) {
  54                 free(argv);
  55                 errno = ENOMEM;
  56                 return NULL;
  57             }
  58             argv  = tmp;
  59             argc += increment;
  60         }
  61         argv[i++] = va_arg(*ap, char*);
  62     } while(argv[i - 1] != NULL);
  63     return argv;
  64 }
  65
  66 /*
  67  * return a malloced vector of pointers to the strings in `ap'
  68  * terminated by NULL.
  69  */
  70
  71 ROKEN_LIB_FUNCTION char ** ROKEN_LIB_CALL
  72 vstrcollect(va_list *ap)
  73 {
  74     return sub (NULL, 0, 0, ap);
  75 }
  76
  77 /*
  78  *
  79  */
  80
  81 ROKEN_LIB_FUNCTION char ** ROKEN_LIB_CALL
  82 strcollect(char *first, ...)
  83 {
  84     va_list ap;
  85     char **ret = malloc (initial * sizeof(char *));
  86
  87     if (ret == NULL)
  88         return ret;
  89
  90     ret[0] = first;
  91     va_start(ap, first);
  92     ret = sub (ret, 1, initial, &ap);
  93     va_end(ap);
  94     return ret;
  95 }