diplodocus.org Git - nmh/blob - sbr/concat.c

   1
   2 /*
   3  * concat.c -- concatenate a variable number (minimum of 1)
   4  *             of strings in managed memory
   5  *
   6  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   7  * COPYRIGHT file in the root directory of the nmh distribution for
   8  * complete copyright information.
   9  */
  10
  11 #include <h/mh.h>
  12 #include <h/utils.h>
  13
  14
  15 /* concat returns a non-NULL malloc'd pointer to the catenation of the
  16  * argument strings less their NUL terminators other than the last.  The
  17  * arguments are terminated by a NULL.
  18  *
  19  * Example:  concat("abc", "def", "", "g", NULL) returns "abcdefg". */
  20 char *
  21 concat (const char *s1, ...)
  22 {
  23     char *cp, *dp, *sp;
  24     size_t len;
  25     va_list list;
  26
  27     len = strlen (s1) + 1;
  28     va_start(list, s1);
  29     while ((cp = va_arg(list, char *)))
  30         len += strlen (cp);
  31     va_end(list);
  32
  33     dp = sp = mh_xmalloc(len);
  34
  35     sp = stpcpy(sp, s1);
  36
  37     va_start(list, s1);
  38     while ((cp = va_arg (list, char *)))
  39         sp = stpcpy(sp, cp);
  40     va_end(list);
  41
  42     return dp;
  43 }