skipto.c

WinCE平台上的语音识别程序

/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
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 * Copyright (c) 1999-2001 Carnegie Mellon University.  All rights
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 * 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.
 *
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/************************************************************************
 *  skipover and skipto -- skip over characters in string
 *
 *  Usage:	p = skipto (string,charset);
 *		p = skipover (string,charset);
 *
 *  char *p,*charset,*string;
 *
 *  Skipto returns a pointer to the first character in string which
 *  is in the string charset; it "skips until" a character in charset.
 *  Skipover returns a pointer to the first character in string which
 *  is not in the string charset; it "skips over" characters in charset.
 ************************************************************************
 *
 * HISTORY
 * 26-Jun-81  David Smith (drs) at Carnegie-Mellon University
 *	Skipover, skipto rewritten to avoid inner loop at expense of space.
 *
 * 20-Nov-79  Steven Shafer (sas) at Carnegie-Mellon University
 *	Skipover, skipto adapted for VAX from skip() and skipx() on the PDP-11
 *	(from Ken Greer).  The names are more mnemonic.
 *
 *	Sindex adapted for VAX from indexs() on the PDP-11 (thanx to Ralph
 *	Guggenheim).  The name has changed to be more like the index()
 *	and rindex() functions from Bell Labs; the return value (pointer
 *	rather than integer) has changed partly for the same reason,
 *	and partly due to popular usage of this function.
 */

#include "strfuncs.h"

static unsigned char tab[256] = {
    0
};

char *
skipto(unsigned char *string, unsigned char const *charset)
{
    register unsigned char const *setp;
    register unsigned char *strp;

    tab[0] = 1;                 /* Stop on a null, too. */
    for (setp = charset; *setp; setp++)
        tab[*setp] = 1;
    for (strp = string; tab[*strp] == 0; strp++);
    for (setp = charset; *setp; setp++)
        tab[*setp] = 0;
    return strp;
}

char *
skipover(unsigned char *string, unsigned char const *charset)
{
    register unsigned char const *setp;
    register unsigned char *strp;

    tab[0] = 0;                 /* Do not skip over nulls. */
    for (setp = charset; *setp; setp++)
        tab[*setp] = 1;
    for (strp = string; tab[*strp]; strp++);
    for (setp = charset; *setp; setp++)
        tab[*setp] = 0;
    return strp;
}