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