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 "got_compat.h"
19 
20 #include <sys/types.h>
21 
22 #include <err.h>
23 #include <stdlib.h>
24 #include <string.h>
25 #include <wchar.h>
26 #include <langinfo.h>
27 
28 #include "got_error.h"
29 #include "got_utf8.h"
30 
31 const struct got_error *
32 got_mbsavis(char** outp, int *widthp, const char *mbs)
33 {
34 	const char *src;  /* Iterate mbs. */
35 	char	 *dst;  /* Iterate *outp. */
36 	wchar_t	  wc;
37 	int	  total_width;  /* Display width of the whole string. */
38 	int	  width;  /* Display width of a single Unicode char. */
39 	int	  len;  /* Length in bytes of UTF-8 encoded string. */
40 
41 	len = strlen(mbs);
42 	if ((*outp = malloc(len + 1)) == NULL)
43 		return got_error_from_errno("malloc");
44 
45 	if (MB_CUR_MAX == 1) {
46 		memcpy(*outp, mbs, len + 1);
47 		*widthp = len;
48 		return NULL;
49 	}
50 
51 	src = mbs;
52 	dst = *outp;
53 	total_width = 0;
54 	while (*src != '\0') {
55 		if ((len = mbtowc(&wc, src, MB_CUR_MAX)) == -1) {
56 			total_width++;
57 			*dst++ = '?';
58 			src++;
59 		} else if ((width = wcwidth(wc)) == -1) {
60 			total_width++;
61 			*dst++ = '?';
62 			src += len;
63 		} else {
64 			total_width += width;
65 			while (len-- > 0)
66 				*dst++ = *src++;
67 		}
68 	}
69 	*dst = '\0';
70 	*widthp = total_width;
71 	return NULL;
72 }
73 
74 int
75 got_locale_is_utf8(void)
76 {
77 	char *codeset = nl_langinfo(CODESET);
78 	return (strcmp(codeset, "UTF-8") == 0);
79 }