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 }