jehanne/sys/src/lib/jehanne/port/utfutf.c

36 lines
877 B
C

/*
* This file is part of the UCB release of Plan 9. It is subject to the license
* terms in the LICENSE file found in the top-level directory of this
* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
* part of the UCB release of Plan 9, including this file, may be copied,
* modified, propagated, or distributed except according to the terms contained
* in the LICENSE file.
*/
#include <u.h>
#include <libc.h>
/*
* Return pointer to first occurrence of s2 in s1,
* 0 if none
*/
char*
jehanne_utfutf(const char *s1, const char *s2)
{
const char *p;
int32_t f, n1, n2;
Rune r;
n1 = jehanne_chartorune(&r, s2);
f = r;
if(f <= Runesync) /* represents self */
return jehanne_strstr(s1, s2);
n2 = jehanne_strlen(s2);
for(p=s1; p=jehanne_utfrune(p, f); p+=n1)
if(jehanne_strncmp(p, s2, n2) == 0)
return (char*)p;
return 0;
}