gno/lib/libc/string/str.c

103 lines
1.6 KiB
C

/*
* str.c
*
* Various string routines not available in OrcaLib. For an explanation
* of these functions, see the appropriate man page.
*
* $Id: str.c,v 1.1 1997/02/28 05:12:50 gdr Exp $
*
* This file is formatted with tabs in every 8 columns.
*/
#ifdef __ORCAC__
segment "libc_str__";
#endif
#pragma optimize 0
#pragma debug 0
#pragma memorymodel 0
#include <stdlib.h>
#include <string.h>
/*
* index
*/
char *
index(const char *a, int b)
{
return strchr(a,b);
}
/*
* rindex
*/
char *
rindex(const char *a, int b)
{
return strrchr(a,b);
}
/*
* strsep
*
* Get next token from string *stringp, where tokens are nonempty
* strings separated by characters from delim.
*
* Writes NULs into the string at *stringp to end tokens.
* delim need not remain constant from call to call.
* On return, *stringp points past the last NUL written (if there might
* be further tokens), or is NULL (if there are definitely no more tokens).
*
* If *stringp is NULL, strtoken returns NULL.
*/
char *
strsep(register char **stringp, register const char *delim)
{
register char *s;
register const char *spanp;
register int c, sc;
char *tok;
if ((s = *stringp) == NULL) {
return (NULL);
}
for (tok = s;;) {
c = *s++;
spanp = delim;
do {
if ((sc = *spanp++) == c) {
if (c == 0) {
s = NULL;
} else {
s[-1] = 0;
}
*stringp = s;
return (tok);
}
} while (sc != 0);
}
/* NOTREACHED */
}
/*
* strdup
*/
char *
strdup(const char *str)
{
size_t len;
char *buf;
len = strlen(str) + 1;
if ((buf = malloc(len)) == NULL) {
return NULL;
}
strcpy(buf, str);
return buf;
}