xref: /illumos-gate/usr/src/boot/sys/boot/efi/libefi/wchar.c (revision eee59048)
1 /*-
2  * Copyright 2016 Netflix, Inc. All Rights Reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
14  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
16  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
17  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
18  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
19  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
20  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
21  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
22  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
23  * SUCH DAMAGE.
24  */
25 
26 #include <sys/cdefs.h>
27 
28 #include <efi.h>
29 #include <efilib.h>
30 
31 /*
32  * CHAR16 related functions moved from loader.
33  * Perhaps we should move those to libstand afterall, but they are
34  * needed only by UEFI.
35  */
36 
37 int
wcscmp(CHAR16 * a,CHAR16 * b)38 wcscmp(CHAR16 *a, CHAR16 *b)
39 {
40 
41 	while (*a && *b && *a == *b) {
42 		a++;
43 		b++;
44 	}
45 	return *a - *b;
46 }
47 
48 /*
49  * cpy8to16 copies a traditional C string into a CHAR16 string and
50  * 0 terminates it. len is the size of *dst in bytes.
51  */
52 void
cpy8to16(const char * src,CHAR16 * dst,size_t len)53 cpy8to16(const char *src, CHAR16 *dst, size_t len)
54 {
55 	len <<= 1;		/* Assume CHAR16 is 2 bytes */
56 	while (len > 0 && *src) {
57 		*dst++ = *src++;
58 		len--;
59 	}
60 	*dst++ = (CHAR16)0;
61 }
62 
63 void
cpy16to8(const CHAR16 * src,char * dst,size_t len)64 cpy16to8(const CHAR16 *src, char *dst, size_t len)
65 {
66 	size_t i;
67 
68 	for (i = 0; i < len && src[i]; i++)
69 		dst[i] = (char)src[i];
70 	if (i < len)
71 		dst[i] = '\0';
72 }
73