utfecpy.c (1159B) download
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 "plan9.h"
17#include "utf.h"
18
19#include <stdarg.h>
20#include <string.h>
21
22char* utfecpy(char* to, char* e, char* from) {
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}