79 lines
2.9 KiB
C
79 lines
2.9 KiB
C
|
/*
|
||
|
|
* Copyright (c) 1991 Carnegie Mellon University
|
||
|
|
* All Rights Reserved.
|
||
|
|
*
|
||
|
|
* Permission to use, copy, modify and distribute this software and its
|
||
|
|
* documentation is hereby granted, provided that both the copyright
|
||
|
|
* notice and this permission notice appear in all copies of the
|
||
|
|
* software, derivative works or modified versions, and any portions
|
||
|
|
* thereof, and that both notices appear in supporting documentation.
|
||
|
|
*
|
||
|
|
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
|
||
|
|
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
|
||
|
|
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
|
||
|
|
*
|
||
|
|
* Carnegie Mellon requests users of this software to return to
|
||
|
|
*
|
||
|
|
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
|
||
|
|
* School of Computer Science
|
||
|
|
* Carnegie Mellon University
|
||
|
|
* Pittsburgh PA 15213-3890
|
||
|
|
*
|
||
|
|
* any improvements or extensions that they make and grant Carnegie the rights
|
||
|
|
* to redistribute these changes.
|
||
|
|
*/
|
||
|
|
/************************************************************************
|
||
|
|
* 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.
|
||
|
|
*/
|
||
|
|
|
||
|
|
static unsigned char tab[256] = {
|
||
|
|
0};
|
||
|
|
|
||
|
|
char *skipto (string,charset)
|
||
|
|
unsigned char *string, *charset;
|
||
|
|
{
|
||
|
|
register unsigned char *setp,*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 ((char *)strp);
|
||
|
|
}
|
||
|
|
|
||
|
|
char *skipover (string,charset)
|
||
|
|
unsigned char *string, *charset;
|
||
|
|
{
|
||
|
|
register unsigned char *setp,*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 ((char *)strp);
|
||
|
|
}
|