wmii

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utfutf.c (1208B)


      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 
     20 /*
     21  * Return pointer to first occurrence of s2 in s1,
     22  * 0 if none
     23  */
     24 char*
     25 utfutf(const char *s1, const char *s2)
     26 {
     27 	const 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 (char*)p;
     40 	return 0;
     41 }