lib/roken/strcollect.c

   1 /*
   2  * Copyright (c) 1998, 1999 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 <string.h>
  39 #include <errno.h>
  40 #include "roken.h"
  41
  42 enum { initial = 10, increment = 5 };
  43
  44 static char **
  45 sub (char **argv, int i, int argc, va_list *ap)
  46 {
  47     do {
  48         if(i == argc) {
  49             /* realloc argv */
  50             char **tmp = realloc(argv, (argc + increment) * sizeof(*argv));
  51             if(tmp == NULL) {
  52                 free(argv);
  53                 errno = ENOMEM;
  54                 return NULL;
  55             }
  56             argv  = tmp;
  57             argc += increment;
  58         }
  59         argv[i++] = va_arg(*ap, char*);
  60     } while(argv[i - 1] != NULL);
  61     return argv;
  62 }
  63
  64 /*
  65  * return a malloced vector of pointers to the strings in `ap'
  66  * terminated by NULL.
  67  */
  68
  69 ROKEN_LIB_FUNCTION char ** ROKEN_LIB_CALL
  70 vstrcollect(va_list *ap)
  71 {
  72     return sub (NULL, 0, 0, ap);
  73 }
  74
  75 /*
  76  *
  77  */
  78
  79 ROKEN_LIB_FUNCTION char ** ROKEN_LIB_CALL
  80 strcollect(char *first, ...)
  81 {
  82     va_list ap;
  83     char **ret = malloc (initial * sizeof(char *));
  84
  85     if (ret == NULL)
  86         return ret;
  87
  88     ret[0] = first;
  89     va_start(ap, first);
  90     ret = sub (ret, 1, initial, &ap);
  91     va_end(ap);
  92     return ret;
  93 }