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

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      mystrtok 3
   6 /* SUMMARY
   7 /*      safe tokenizer
   8 /* SYNOPSIS
   9 /*      #include <stringops.h>
  10 /*
  11 /*      char    *mystrtok(bufp, delimiters)
  12 /*      char    **bufp;
  13 /*      const char *delimiters;
  14 /* DESCRIPTION
  15 /*      mystrtok() splits a buffer on the specified \fIdelimiters\fR.
  16 /*      Tokens are delimited by runs of delimiters, so this routine
  17 /*      cannot return zero-length tokens.
  18 /*
  19 /*      The \fIbufp\fR argument specifies the start of the search; it
  20 /*      is updated with each call. The input is destroyed.
  21 /*
  22 /*      The result value is the next token, or a null pointer when the
  23 /*      end of the buffer was reached.
  24 /* LICENSE
  25 /* .ad
  26 /* .fi
  27 /*      The Secure Mailer license must be distributed with this software.
  28 /* AUTHOR(S)
  29 /*      Wietse Venema
  30 /*      IBM T.J. Watson Research
  31 /*      P.O. Box 704
  32 /*      Yorktown Heights, NY 10598, USA
  33 /*--*/
  34
  35 /* System library. */
  36
  37 #include "sys_defs.h"
  38 #include <string.h>
  39
  40 /* Utility library. */
  41
  42 #include "stringops.h"
  43
  44 /* mystrtok - safe tokenizer */
  45
  46 char   *mystrtok(char **src, const char *sep)
  47 {
  48     char   *start = *src;
  49     char   *end;
  50
  51     /*
  52      * Skip over leading delimiters.
  53      */
  54     start += strspn(start, sep);
  55     if (*start == 0) {
  56         *src = start;
  57         return (0);
  58     }
  59
  60     /*
  61      * Separate off one token.
  62      */
  63     end = start + strcspn(start, sep);
  64     if (*end != 0)
  65         *end++ = 0;
  66     *src = end;
  67     return (start);
  68 }
  69
  70 #ifdef TEST
  71
  72  /*
  73   * Test program: read lines from stdin, split on whitespace.
  74   */
  75 #include "vstring.h"
  76 #include "vstream.h"
  77 #include "vstring_vstream.h"
  78
  79 int     main(void)
  80 {
  81     VSTRING *vp = vstring_alloc(100);
  82     char   *start;
  83     char   *str;
  84
  85     while (vstring_fgets(vp, VSTREAM_IN)) {
  86         start = vstring_str(vp);
  87         while ((str = mystrtok(&start, " \t\r\n")) != 0)
  88             vstream_printf(">%s<\n", str);
  89         vstream_fflush(VSTREAM_OUT);
  90     }
  91     vstring_free(vp);
  92     return (0);
  93 }
  94
  95 #endif