external/ibm-public/postfix/dist/src/util/concatenate.c

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      concatenate 3
   6 /* SUMMARY
   7 /*      concatenate strings
   8 /* SYNOPSIS
   9 /*      #include <stringops.h>
  10 /*
  11 /*      char    *concatenate(str, ...)
  12 /*      const char *str;
  13 /* DESCRIPTION
  14 /*      The \fBconcatenate\fR routine concatenates a null-terminated
  15 /*      list of pointers to null-terminated character strings.
  16 /*      The result is dynamically allocated and should be passed to myfree()
  17 /*      when no longer needed.
  18 /* LICENSE
  19 /* .ad
  20 /* .fi
  21 /*      The Secure Mailer license must be distributed with this software.
  22 /* AUTHOR(S)
  23 /*      Wietse Venema
  24 /*      IBM T.J. Watson Research
  25 /*      P.O. Box 704
  26 /*      Yorktown Heights, NY 10598, USA
  27 /*--*/
  28
  29 /* System library. */
  30
  31 #include <sys_defs.h>
  32 #include <stdlib.h>                     /* 44BSD stdarg.h uses abort() */
  33 #include <stdarg.h>
  34 #include <string.h>
  35
  36 /* Utility library. */
  37
  38 #include "mymalloc.h"
  39 #include "stringops.h"
  40
  41 /* concatenate - concatenate null-terminated list of strings */
  42
  43 char   *concatenate(const char *arg0,...)
  44 {
  45     char   *result;
  46     va_list ap;
  47     ssize_t len;
  48     char   *arg;
  49
  50     /*
  51      * Compute the length of the resulting string.
  52      */
  53     va_start(ap, arg0);
  54     len = strlen(arg0);
  55     while ((arg = va_arg(ap, char *)) != 0)
  56         len += strlen(arg);
  57     va_end(ap);
  58
  59     /*
  60      * Build the resulting string. Don't care about wasting a CPU cycle.
  61      */
  62     result = mymalloc(len + 1);
  63     va_start(ap, arg0);
  64     strcpy(result, arg0);
  65     while ((arg = va_arg(ap, char *)) != 0)
  66         strcat(result, arg);
  67     va_end(ap);
  68     return (result);
  69 }