source/texk/kpathsea/concatn.c

   1 /* concatn.c: concatenate an arbitrary number of strings.
   2
   3    Copyright 1993, 1995, 2008, 2009 Karl Berry.
   4    Copyright 1999, 2005 Olaf Weber.
   5
   6    This library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    This library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public License
  17    along with this library; if not, see <http://www.gnu.org/licenses/>.  */
  18
  19 #include <kpathsea/config.h>
  20
  21 #include <kpathsea/concatn.h>
  22
  23
  24 /* OK, it would be epsilon more efficient to compute the total length
  25    and then do the copying ourselves, but I doubt it matters in reality.  */
  26
  27 string
  28 concatn (const_string str1, ...)
  29 {
  30   string arg;
  31   string ret;
  32   va_list ap;
  33
  34   if (!str1)
  35     return NULL;
  36
  37   ret = xstrdup (str1);
  38
  39   va_start (ap, str1);
  40   while ((arg = va_arg (ap, string)) != NULL)
  41     {
  42       string temp = concat (ret, arg);
  43       free (ret);
  44       ret = temp;
  45     }
  46   va_end (ap);
  47
  48   return ret;
  49 }
  50 \f
  51 #ifdef TEST
  52 int
  53 main ()
  54 {
  55   printf ("null = \"%s\"\n", concatn (NULL));
  56   printf ("\"a\" = \"%s\"\n", concatn ("a", NULL));
  57   printf ("\"ab\" = \"%s\"\n", concatn ("a", "b", NULL));
  58   printf ("\"abc\" = \"%s\"\n", concatn ("a", "b", "c", NULL));
  59   printf ("\"abcd\" = \"%s\"\n", concatn ("ab", "cd", NULL));
  60   printf ("\"abcde\" = \"%s\"\n", concatn ("ab", "c", "de", NULL));
  61   printf ("\"abcdef\" = \"%s\"\n", concatn ("", "a", "", "bcd", "ef", NULL));
  62   return 0;
  63 }
  64
  65 #endif /* TEST */
  66
  67
  68 /*
  69 Local variables:
  70 standalone-compile-command: "gcc -posix -g -I. -I.. -DTEST concatn.c kpathsea.a"
  71 End:
  72 */