1 /*
2  * Copyright (c) 2015 Ingo Schwarze <schwarze@openbsd.org>
3  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
4  *
5  * Permission to use, copy, modify, and distribute this software for any
6  * purpose with or without fee is hereby granted, provided that the above
7  * copyright notice and this permission notice appear in all copies.
8  *
9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16  */
17 
18 #include <sys/types.h>
19 
20 #include <err.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <wchar.h>
24 #include <langinfo.h>
25 
26 #include "got_error.h"
27 #include "got_utf8.h"
28 
29 const struct got_error *
30 got_mbsavis(char** outp, int *widthp, const char *mbs)
31 {
32 	const char *src;  /* Iterate mbs. */
33 	char	 *dst;  /* Iterate *outp. */
34 	wchar_t	  wc;
35 	int	  total_width;  /* Display width of the whole string. */
36 	int	  width;  /* Display width of a single Unicode char. */
37 	int	  len;  /* Length in bytes of UTF-8 encoded string. */
38 
39 	len = strlen(mbs);
40 	if ((*outp = malloc(len + 1)) == NULL)
41 		return got_error_from_errno("malloc");
42 
43 	if (MB_CUR_MAX == 1) {
44 		memcpy(*outp, mbs, len + 1);
45 		*widthp = len;
46 		return NULL;
47 	}
48 
49 	src = mbs;
50 	dst = *outp;
51 	total_width = 0;
52 	while (*src != '\0') {
53 		if ((len = mbtowc(&wc, src, MB_CUR_MAX)) == -1) {
54 			total_width++;
55 			*dst++ = '?';
56 			src++;
57 		} else if ((width = wcwidth(wc)) == -1) {
58 			total_width++;
59 			*dst++ = '?';
60 			src += len;
61 		} else {
62 			total_width += width;
63 			while (len-- > 0)
64 				*dst++ = *src++;
65 		}
66 	}
67 	*dst = '\0';
68 	*widthp = total_width;
69 	return NULL;
70 }
71 
72 int
73 got_locale_is_utf8(void)
74 {
75 	char *codeset = nl_langinfo(CODESET);
76 	return (strcmp(codeset, "UTF-8") == 0);
77 }