utfrrune.c - 9base - revived minimalist port of Plan 9 userland to Unix
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       utfrrune.c (1197B)
       ---
            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 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 }