runestrchr.c - 9base - revived minimalist port of Plan 9 userland to Unix
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       runestrchr.c (1001B)
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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 Rune*
           20 runestrchr(Rune *s, Rune c)
           21 {
           22         Rune c0 = c;
           23         Rune c1;
           24 
           25         if(c == 0) {
           26                 while(*s++)
           27                         ;
           28                 return s-1;
           29         }
           30 
           31         while(c1 = *s++)
           32                 if(c1 == c0)
           33                         return s-1;
           34         return 0;
           35 }