utfutf.c - 9base - revived minimalist port of Plan 9 userland to Unix
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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 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(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 }