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      1 /*	$NetBSD: trimblanks.c,v 1.2 2017/02/14 01:16:49 christos Exp $	*/
      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 /*	ssize_t	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, ssize_t 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 }
     53