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	utfrrune.c - 9base - revived minimalist port of Plan 9 userland to Unix
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	utfrrune.c (1197B)
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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 char*
	20 utfrrune(char *s, long c)
	21 {
	22 long c1;
	23 Rune r;
	24 char *s1;
	25
	26 if(c < Runesync) /* not part of utf sequence */
	27 return strrchr(s, c);
	28
	29 s1 = 0;
	30 for(;;) {
	31 c1 = (uchar)s;
	32 if(c1 < Runeself) { /* one byte rune */
	33 if(c1 == 0)
	34 return s1;
	35 if(c1 == c)
	36 s1 = s;
	37 s++;
	38 continue;
	39 }
	40 c1 = chartorune(&r, s);
	41 if(r == c)
	42 s1 = s;
	43 s += c1;
	44 }
	45 }