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	utfutf.c - 9base - revived minimalist port of Plan 9 userland to Unix
	git clone git://git.suckless.org/9base
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	utfutf.c (1183B)
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	1 /*
	2 * The authors of this software are Rob Pike and Ken Thompson.
	3 * Copyright (c) 2002 by Lucent Technologies.
	4 * Permission to use, copy, modify, and distribute this software for any
	5 * purpose without fee is hereby granted, provided that this entire noti…
	6 * is included in all copies of any software which is or includes a copy
	7 * or modification of this software and in all copies of the supporting
	8 * documentation for such software.
	9 * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLI…
	10 * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES…
	11 * ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABI…
	12 * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
	13 */
	14 #include <stdarg.h>
	15 #include <string.h>
	16 #include "plan9.h"
	17 #include "utf.h"
	18
	19
	20 /*
	21 * Return pointer to first occurrence of s2 in s1,
	22 * 0 if none
	23 */
	24 char*
	25 utfutf(char s1, char s2)
	26 {
	27 char *p;
	28 long f, n1, n2;
	29 Rune r;
	30
	31 n1 = chartorune(&r, s2);
	32 f = r;
	33 if(f <= Runesync) /* represents self */
	34 return strstr(s1, s2);
	35
	36 n2 = strlen(s2);
	37 for(p=s1; p=utfrune(p, f); p+=n1)
	38 if(strncmp(p, s2, n2) == 0)
	39 return p;
	40 return 0;
	41 }