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

   1 /*      $NetBSD$        */
   2
   3 /*++
   4 /* NAME
   5 /*      allspace 3
   6 /* SUMMARY
   7 /*      predicate if string is all space
   8 /* SYNOPSIS
   9 /*      #include <stringops.h>
  10 /*
  11 /*      int     allspace(buffer)
  12 /*      const char *buffer;
  13 /* DESCRIPTION
  14 /*      allspace() determines if its argument is an all-space string.
  15 /*
  16 /*      Arguments:
  17 /* .IP buffer
  18 /*      The null-terminated input string.
  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 /* allspace - return true if string is all space */
  40
  41 int     allspace(const char *string)
  42 {
  43     const char *cp;
  44     int     ch;
  45
  46     if (*string == 0)
  47         return (0);
  48     for (cp = string; (ch = *(unsigned char *) cp) != 0; cp++)
  49         if (!ISASCII(ch) || !ISSPACE(ch))
  50             return (0);
  51     return (1);
  52 }