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

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