xref: /freebsd/lib/libc/string/strxfrm.c (revision 1e413cf93298b5b97441a21d9a50fdcd0ee9945e)
1 /*-
2  * Copyright (c) 1995 Alex Tatmanjants <alex@elvisti.kiev.ua>
3  *		at Electronni Visti IA, Kiev, Ukraine.
4  *			All rights reserved.
5  *
6  * Redistribution and use in source and binary forms, with or without
7  * modification, are permitted provided that the following conditions
8  * are met:
9  * 1. Redistributions of source code must retain the above copyright
10  *    notice, this list of conditions and the following disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND
16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE
19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25  * SUCH DAMAGE.
26  */
27 
28 #include <sys/cdefs.h>
29 __FBSDID("$FreeBSD$");
30 
31 #include <stdlib.h>
32 #include <string.h>
33 #include "collate.h"
34 
35 size_t
36 strxfrm(char * __restrict dest, const char * __restrict src, size_t len)
37 {
38 	int prim, sec, l;
39 	size_t slen;
40 	char *s, *ss;
41 
42 	if (!*src) {
43 		if (len > 0)
44 			*dest = '\0';
45 		return 0;
46 	}
47 
48 	if (__collate_load_error) {
49 		slen = strlen(src);
50 		if (len > 0) {
51 			if (slen < len)
52 				strcpy(dest, src);
53 			else {
54 				strncpy(dest, src, len - 1);
55 				dest[len - 1] = '\0';
56 			}
57 		}
58 		return slen;
59 	}
60 
61 	slen = 0;
62 	prim = sec = 0;
63 	ss = s = __collate_substitute(src);
64 	while (*s) {
65 		while (*s && !prim) {
66 			__collate_lookup(s, &l, &prim, &sec);
67 			s += l;
68 		}
69 		if (prim) {
70 			if (len > 1) {
71 				*dest++ = (char)prim;
72 				len--;
73 			}
74 			slen++;
75 			prim = 0;
76 		}
77 	}
78 	free(ss);
79 	if (len > 0)
80 		*dest = '\0';
81 
82 	return slen;
83 }
84