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

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