9base

revived minimalist port of Plan 9 userland to Unix
git clone git://git.suckless.org/9base
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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 }