utfecpy.c - 9base - revived minimalist port of Plan 9 userland to Unix
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       ---
       utfecpy.c (1114B)
       ---
            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 #define _BSD_SOURCE 1        /* memccpy */
           15 #include <stdarg.h>
           16 #include <string.h>
           17 #include "plan9.h"
           18 #include "utf.h"
           19 
           20 char*
           21 utfecpy(char *to, char *e, char *from)
           22 {
           23         char *end;
           24 
           25         if(to >= e)
           26                 return to;
           27         end = memccpy(to, from, '\0', e - to);
           28         if(end == nil){
           29                 end = e-1;
           30                 while(end>to && (*--end&0xC0)==0x80)
           31                         ;
           32                 *end = '\0';
           33         }else{
           34                 end--;
           35         }
           36         return end;
           37 }