trimblanks.c

[詳解]

/*++
/* NAME
/*  trimblanks 3
/* SUMMARY
/*  skip leading whitespace
/* SYNOPSIS
/*  #include <stringops.h>
/*
/*  char    *trimblanks(string, len)
/*  char    *string;
/*  ssize_t len;
/* DESCRIPTION
/*  trimblanks() returns a pointer to the beginning of the trailing
/*  whitespace in \fIstring\fR, or a pointer to the string terminator
/*  when the string contains no trailing whitespace.
/*  The \fIlen\fR argument is either zero or the string length.
/* LICENSE
/* .ad
/* .fi
/*  The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/*  Wietse Venema
/*  IBM T.J. Watson Research
/*  P.O. Box 704
/*  Yorktown Heights, NY 10598, USA
/*--*/

/* System library. */

#include "sys_defs.h"
#include <ctype.h>

/* Utility library. */

#include "stringops.h"

char   *trimblanks(char *string, ssize_t len)
{
    char   *curr;

    if (len) {
    curr = string + len;
    } else {
    for (curr = string; *curr != 0; curr++)
         /* void */ ;
    }
    while (curr > string && ISSPACE(curr[-1]))
    curr -= 1;
    return (curr);
}