- 论坛徽章:
- 0
|
用static,请参考strtok的实现。
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)strtok.c 8.1 (Berkeley) 6/4/93";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/string/strtok.c,v 1.9 2002/09/07 02:53:19 tjr Exp $");
#include <stddef.h>
#ifdef DEBUG_STRTOK
#include <stdio.h>
#endif
#include <string.h>
char *__strtok_r(char *, const char *, char **);
__weak_reference(__strtok_r, strtok_r);
char *
__strtok_r(char *s, const char *delim, char **last)
{
char *spanp, *tok;
int c, sc;
if (s == NULL && (s = *last) == NULL)
return (NULL);
/*
* Skip (span) leading delimiters (s += strspn(s, delim), sort of).
*/
cont:
c = *s++;
for (spanp = (char *)delim; (sc = *spanp++) != 0;) {
if (c == sc)
goto cont;
}
if (c == 0) { /* no non-delimiter characters */
*last = NULL;
return (NULL);
}
tok = s - 1;
/*
* Scan token (scan for delimiters: s += strcspn(s, delim), sort of).
* Note that delim must have one NUL; we stop if we see that, too.
*/
for (;;) {
c = *s++;
spanp = (char *)delim;
do {
if ((sc = *spanp++) == c) {
if (c == 0)
s = NULL;
else
s[-1] = '\0';
*last = s;
return (tok);
}
} while (sc != 0);
}
/* NOTREACHED */
}
char *
strtok(char *s, const char *delim)
{
static char *last;
return (__strtok_r(s, delim, &last));
} |
|
|