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	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 noti…
	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 IMPLI…
	10 * WARRANTY. IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES…
	11 * ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABI…
	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 }