nxtarg.c

WinCE平台上的语音识别程序

/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* ====================================================================
 * Copyright (c) 1999-2001 Carnegie Mellon University.  All rights
 * reserved.
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 * 1. Redistributions of source code must retain the above copyright
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 *    distribution.
 *
 * This work was supported in part by funding from the Defense Advanced 
 * Research Projects Agency and the National Science Foundation of the 
 * United States of America, and the CMU Sphinx Speech Consortium.
 *
 * THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND 
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/*
 *  nxtarg -- strip off arguments from a string
 *
 *  Usage:  p = nxtarg (&q,brk);
 *	char *p,*q,*brk;
 *	extern char _argbreak;
 *
 *	q is pointer to next argument in string
 *	after call, p points to string containing argument,
 *	q points to remainder of string
 *
 *  Leading blanks and tabs are skipped; the argument ends at the
 *  first occurence of one of the characters in the string "brk".
 *  When such a character is found, it is put into the external
 *  variable "_argbreak", and replaced by a null character; if the
 *  arg string ends before that, then the null character is
 *  placed into _argbreak;
 *  If "brk" is 0, then " " is substituted.
 *
 *  HISTORY
 * 01-Jul-83  Steven Shafer (sas) at Carnegie-Mellon University
 *	Bug fix: added check for "back >= front" in loop to chop trailing
 *	white space.
 *
 * 20-Nov-79  Steven Shafer (sas) at Carnegie-Mellon University
 *	Rewritten for VAX.  By popular demand, a table of break characters
 *	has been added (implemented as a string passed into nxtarg).
 *
 *  Originally	from klg (Ken Greer); IUS/SUS UNIX.
 */

#include <stdlib.h>
#include "strfuncs.h"

#ifndef NULL
#define NULL (void *)0
#endif

static char _argbreak;

char *
nxtarg(char **q, char const *brk)
{
    register char *front;
    register char *back;
    front = *q;                 /* start of string */
    /* leading blanks and tabs */
    while (*front && (*front == ' ' || *front == '\t'))
        front++;
    /* find break character at end */
    if (brk == NULL)
        brk = " ";
    back = skipto(front, brk);
    _argbreak = *back;
    *q = (*back ? back + 1 : back);     /* next arg start loc */
    /* elim trailing blanks and tabs */
    back -= 1;
    while ((back >= front) && (*back == ' ' || *back == '\t'))
        back--;
    back++;
    if (*back)
        *back = '\0';
    return (front);
}