tutfecpy.c - plan9port - [fork] Plan 9 from user space
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       tutfecpy.c (1140B)
       ---
            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 #define _DEFAULT_SOURCE 1
           16 #include <stdarg.h>
           17 #include <string.h>
           18 #include "plan9.h"
           19 #include "utf.h"
           20 
           21 char*
           22 utfecpy(char *to, char *e, char *from)
           23 {
           24         char *end;
           25 
           26         if(to >= e)
           27                 return to;
           28         end = memccpy(to, from, '\0', e - to);
           29         if(end == nil){
           30                 end = e-1;
           31                 while(end>to && (*--end&0xC0)==0x80)
           32                         ;
           33                 *end = '\0';
           34         }else{
           35                 end--;
           36         }
           37         return end;
           38 }