home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Collection of Tools & Utilities
/
Collection of Tools and Utilities.iso
/
tex
/
egrep.zip
/
COMPAT-S.C
next >
Wrap
C/C++ Source or Header
|
1988-03-31
|
3KB
|
110 lines
/*
* regcomp(), regexec(), and xread() were posted to mod.sources by
* henry spencer, and are too large to be included here.
*
* This file contains strcspn, strchr, strpbrk, and getopt.
*/
#include <stdio.h>
/*
* strcspn - find length of initial segment of s1 consisting entirely
* of characters not from s2
*/
int strcspn(s1, s2)
char *s1;
char *s2;
{
register char *scan1;
register char *scan2;
register int count;
count = 0;
for (scan1 = s1; *scan1 != '\0'; scan1++) {
for (scan2 = s2; *scan2 != '\0';) /* ++ moved down. */
if (*scan1 == *scan2++)
return(count);
count++;
}
return(count);
}
char *strchr(a, b)
char *a, b;
{
char *index();
return (index(a, b));
}
/* strpbrk - Returns a pointer to the first character of source that is any
* of the specified keys, or NULL if none of the keys are present
* in the source string.
*/
char *strpbrk(source, keys)
char *source, *keys;
{
register int loc = 0, key_index = 0;
while (source[loc] != '\0') {
key_index = 0;
while (keys[key_index] != '\0')
if (keys[key_index++] == source[loc])
return((char *) (source + loc));
loc++;
}
return(NULL);
}
/*
* getopt - get option letter from argument vector
*/
int opterr = 1, /* useless, never set or used */
optind = 1, /* index into parent argv vector */
optopt; /* character checked for validity */
char *optarg; /* argument associated with option */
#define BADCH (int)'?'
#define EMSG ""
#define tell(s) fputs(*nargv,stderr);fputs(s,stderr); \
fputc(optopt,stderr);fputc('\n',stderr);return(BADCH);
getopt(nargc,nargv,ostr)
int nargc;
char **nargv,
*ostr;
{
static char *place = EMSG; /* option letter processing */
register char *oli; /* option letter list index */
char *index();
if(!*place) { /* update scanning pointer */
if(optind >= nargc || *(place = nargv[optind]) != '-' || !*++place) return(EOF);
if (*place == '-') { /* found "--" */
++optind;
return(EOF);
}
} /* option letter okay? */
if ((optopt = (int)*place++) == (int)':' || !(oli = index(ostr,optopt))) {
if(!*place) ++optind;
tell(": illegal option -- ");
}
if (*++oli != ':') { /* don't need argument */
optarg = NULL;
if (!*place) ++optind;
}
else { /* need an argument */
if (*place) optarg = place; /* no white space */
else if (nargc <= ++optind) { /* no arg */
place = EMSG;
tell(": option requires an argument -- ");
}
else optarg = nargv[optind]; /* white space */
place = EMSG;
++optind;
}
return(optopt); /* dump back option letter */
}