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79 lines
2.9 KiB
C
79 lines
2.9 KiB
C
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/*
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* Copyright (c) 1991 Carnegie Mellon University
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* All Rights Reserved.
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*
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* Permission to use, copy, modify and distribute this software and its
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* documentation is hereby granted, provided that both the copyright
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* notice and this permission notice appear in all copies of the
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* software, derivative works or modified versions, and any portions
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* thereof, and that both notices appear in supporting documentation.
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*
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* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
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* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
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* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
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*
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* Carnegie Mellon requests users of this software to return to
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*
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* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
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* School of Computer Science
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* Carnegie Mellon University
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* Pittsburgh PA 15213-3890
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*
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* any improvements or extensions that they make and grant Carnegie the rights
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* to redistribute these changes.
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*/
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/************************************************************************
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* skipover and skipto -- skip over characters in string
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*
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* Usage: p = skipto (string,charset);
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* p = skipover (string,charset);
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*
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* char *p,*charset,*string;
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*
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* Skipto returns a pointer to the first character in string which
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* is in the string charset; it "skips until" a character in charset.
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* Skipover returns a pointer to the first character in string which
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* is not in the string charset; it "skips over" characters in charset.
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************************************************************************
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* HISTORY
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* 26-Jun-81 David Smith (drs) at Carnegie-Mellon University
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* Skipover, skipto rewritten to avoid inner loop at expense of space.
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*
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* 20-Nov-79 Steven Shafer (sas) at Carnegie-Mellon University
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* Skipover, skipto adapted for VAX from skip() and skipx() on the PDP-11
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* (from Ken Greer). The names are more mnemonic.
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*
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* Sindex adapted for VAX from indexs() on the PDP-11 (thanx to Ralph
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* Guggenheim). The name has changed to be more like the index()
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* and rindex() functions from Bell Labs; the return value (pointer
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* rather than integer) has changed partly for the same reason,
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* and partly due to popular usage of this function.
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*/
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static unsigned char tab[256] = {
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0};
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char *skipto (string,charset)
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unsigned char *string, *charset;
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{
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register unsigned char *setp,*strp;
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tab[0] = 1; /* Stop on a null, too. */
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for (setp=charset; *setp; setp++) tab[*setp]=1;
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for (strp=string; tab[*strp]==0; strp++) ;
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for (setp=charset; *setp; setp++) tab[*setp]=0;
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return ((char *)strp);
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}
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char *skipover (string,charset)
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unsigned char *string, *charset;
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{
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register unsigned char *setp,*strp;
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tab[0] = 0; /* Do not skip over nulls. */
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for (setp=charset; *setp; setp++) tab[*setp]=1;
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for (strp=string; tab[*strp]; strp++) ;
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for (setp=charset; *setp; setp++) tab[*setp]=0;
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return ((char *)strp);
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}
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