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utfrune.c (1184B)


      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 notice
      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 IMPLIED
     10  * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE
     11  * ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
     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 utfrune(char *s, long c)
     21 {
     22 	long c1;
     23 	Rune r;
     24 	int n;
     25 
     26 	if(c < Runesync)		/* not part of utf sequence */
     27 		return strchr(s, c);
     28 
     29 	for(;;) {
     30 		c1 = *(uchar*)s;
     31 		if(c1 < Runeself) {	/* one byte rune */
     32 			if(c1 == 0)
     33 				return 0;
     34 			if(c1 == c)
     35 				return s;
     36 			s++;
     37 			continue;
     38 		}
     39 		n = chartorune(&r, s);
     40 		if(r == c)
     41 			return s;
     42 		s += n;
     43 	}
     44 }