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

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      trimblanks 3
   6 /* SUMMARY
   7 /*      skip leading whitespace
   8 /* SYNOPSIS
   9 /*      #include <stringops.h>
  10 /*
  11 /*      char    *trimblanks(string, len)
  12 /*      char    *string;
  13 /*      int     len;
  14 /* DESCRIPTION
  15 /*      trimblanks() returns a pointer to the beginning of the trailing
  16 /*      whitespace in \fIstring\fR, or a pointer to the string terminator
  17 /*      when the string contains no trailing whitespace.
  18 /*      The \fIlen\fR argument is either zero or the string length.
  19 /* LICENSE
  20 /* .ad
  21 /* .fi
  22 /*      The Secure Mailer license must be distributed with this software.
  23 /* AUTHOR(S)
  24 /*      Wietse Venema
  25 /*      IBM T.J. Watson Research
  26 /*      P.O. Box 704
  27 /*      Yorktown Heights, NY 10598, USA
  28 /*--*/
  29
  30 /* System library. */
  31
  32 #include "sys_defs.h"
  33 #include <ctype.h>
  34
  35 /* Utility library. */
  36
  37 #include "stringops.h"
  38
  39 char   *trimblanks(char *string, int len)
  40 {
  41     char   *curr;
  42
  43     if (len) {
  44         curr = string + len;
  45     } else {
  46         for (curr = string; *curr != 0; curr++)
  47              /* void */ ;
  48     }
  49     while (curr > string && ISSPACE(curr[-1]))
  50         curr -= 1;
  51     return (curr);
  52 }