freshlybakedca.ke
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1/*
2 * Converts filenames from decomposed unicode into precomposed unicode.
3 * Used on MacOS X.
4 */
5
6#define PRECOMPOSE_UNICODE_C
7#define USE_THE_REPOSITORY_VARIABLE
8
9#include "git-compat-util.h"
10#include "config.h"
11#include "environment.h"
12#include "gettext.h"
13#include "path.h"
14#include "strbuf.h"
15#include "utf8.h"
16#include "precompose_utf8.h"
17
18typedef char *iconv_ibp;
19static const char *repo_encoding = "UTF-8";
20static const char *path_encoding = "UTF-8-MAC";
21
22static size_t has_non_ascii(const char *s, size_t maxlen, size_t *strlen_c)
23{
24 const uint8_t *ptr = (const uint8_t *)s;
25 size_t strlen_chars = 0;
26 size_t ret = 0;
27
28 if (!ptr || !*ptr)
29 return 0;
30
31 while (*ptr && maxlen) {
32 if (*ptr & 0x80)
33 ret++;
34 strlen_chars++;
35 ptr++;
36 maxlen--;
37 }
38 if (strlen_c)
39 *strlen_c = strlen_chars;
40
41 return ret;
42}
43
44
45void probe_utf8_pathname_composition(void)
46{
47 struct strbuf path = STRBUF_INIT;
48 static const char *auml_nfc = "\xc3\xa4";
49 static const char *auml_nfd = "\x61\xcc\x88";
50 int output_fd;
51 if (precomposed_unicode != -1)
52 return; /* We found it defined in the global config, respect it */
53 repo_git_path_replace(the_repository, &path, "%s", auml_nfc);
54 output_fd = open(path.buf, O_CREAT|O_EXCL|O_RDWR, 0600);
55 if (output_fd >= 0) {
56 close(output_fd);
57 repo_git_path_replace(the_repository, &path, "%s", auml_nfd);
58 precomposed_unicode = access(path.buf, R_OK) ? 0 : 1;
59 repo_config_set(the_repository, "core.precomposeunicode",
60 precomposed_unicode ? "true" : "false");
61 repo_git_path_replace(the_repository, &path, "%s", auml_nfc);
62 if (unlink(path.buf))
63 die_errno(_("failed to unlink '%s'"), path.buf);
64 }
65 strbuf_release(&path);
66}
67
68const char *precompose_string_if_needed(const char *in)
69{
70 size_t inlen;
71 size_t outlen;
72 if (!in)
73 return NULL;
74 if (has_non_ascii(in, (size_t)-1, &inlen)) {
75 iconv_t ic_prec;
76 char *out;
77 if (precomposed_unicode < 0)
78 repo_config_get_bool(the_repository, "core.precomposeunicode", &precomposed_unicode);
79 if (precomposed_unicode != 1)
80 return in;
81 ic_prec = iconv_open(repo_encoding, path_encoding);
82 if (ic_prec == (iconv_t) -1)
83 return in;
84
85 out = reencode_string_iconv(in, inlen, ic_prec, 0, &outlen);
86 if (out) {
87 if (outlen == inlen && !memcmp(in, out, outlen))
88 free(out); /* no need to return indentical */
89 else
90 in = out;
91 }
92 iconv_close(ic_prec);
93
94 }
95 return in;
96}
97
98const char *precompose_argv_prefix(int argc, const char **argv, const char *prefix)
99{
100 int i = 0;
101
102 while (i < argc) {
103 argv[i] = precompose_string_if_needed(argv[i]);
104 i++;
105 }
106 return precompose_string_if_needed(prefix);
107}
108
109
110PREC_DIR *precompose_utf8_opendir(const char *dirname)
111{
112 PREC_DIR *prec_dir = xmalloc(sizeof(PREC_DIR));
113 prec_dir->dirent_nfc = xmalloc(sizeof(dirent_prec_psx));
114 prec_dir->dirent_nfc->max_name_len = sizeof(prec_dir->dirent_nfc->d_name);
115
116 prec_dir->dirp = opendir(dirname);
117 if (!prec_dir->dirp) {
118 free(prec_dir->dirent_nfc);
119 free(prec_dir);
120 return NULL;
121 } else {
122 int ret_errno = errno;
123 prec_dir->ic_precompose = iconv_open(repo_encoding, path_encoding);
124 /* if iconv_open() fails, die() in readdir() if needed */
125 errno = ret_errno;
126 }
127
128 return prec_dir;
129}
130
131struct dirent_prec_psx *precompose_utf8_readdir(PREC_DIR *prec_dir)
132{
133 struct dirent *res;
134 res = readdir(prec_dir->dirp);
135 if (res) {
136 size_t namelenz = strlen(res->d_name) + 1; /* \0 */
137 size_t new_maxlen = namelenz;
138
139 int ret_errno = errno;
140
141 if (new_maxlen > prec_dir->dirent_nfc->max_name_len) {
142 size_t new_len = sizeof(dirent_prec_psx) + new_maxlen -
143 sizeof(prec_dir->dirent_nfc->d_name);
144
145 prec_dir->dirent_nfc = xrealloc(prec_dir->dirent_nfc, new_len);
146 prec_dir->dirent_nfc->max_name_len = new_maxlen;
147 }
148
149 prec_dir->dirent_nfc->d_ino = res->d_ino;
150 prec_dir->dirent_nfc->d_type = res->d_type;
151
152 if ((precomposed_unicode == 1) && has_non_ascii(res->d_name, (size_t)-1, NULL)) {
153 if (prec_dir->ic_precompose == (iconv_t)-1) {
154 die("iconv_open(%s,%s) failed, but needed:\n"
155 " precomposed unicode is not supported.\n"
156 " If you want to use decomposed unicode, run\n"
157 " \"git config core.precomposeunicode false\"\n",
158 repo_encoding, path_encoding);
159 } else {
160 iconv_ibp cp = (iconv_ibp)res->d_name;
161 size_t inleft = namelenz;
162 char *outpos = &prec_dir->dirent_nfc->d_name[0];
163 size_t outsz = prec_dir->dirent_nfc->max_name_len;
164 errno = 0;
165 iconv(prec_dir->ic_precompose, &cp, &inleft, &outpos, &outsz);
166 if (errno || inleft) {
167 /*
168 * iconv() failed and errno could be E2BIG, EILSEQ, EINVAL, EBADF
169 * MacOS X avoids illegal byte sequences.
170 * If they occur on a mounted drive (e.g. NFS) it is not worth to
171 * die() for that, but rather let the user see the original name
172 */
173 namelenz = 0; /* trigger strlcpy */
174 }
175 }
176 } else
177 namelenz = 0;
178
179 if (!namelenz)
180 strlcpy(prec_dir->dirent_nfc->d_name, res->d_name,
181 prec_dir->dirent_nfc->max_name_len);
182
183 errno = ret_errno;
184 return prec_dir->dirent_nfc;
185 }
186 return NULL;
187}
188
189
190int precompose_utf8_closedir(PREC_DIR *prec_dir)
191{
192 int ret_value;
193 int ret_errno;
194 ret_value = closedir(prec_dir->dirp);
195 ret_errno = errno;
196 if (prec_dir->ic_precompose != (iconv_t)-1)
197 iconv_close(prec_dir->ic_precompose);
198 free(prec_dir->dirent_nfc);
199 free(prec_dir);
200 errno = ret_errno;
201 return ret_value;
202}