debian: new upstream release candidate
[git/debian.git] / compat / precompose_utf8.c
blob079070ff1d4bd629712eff5f6f6e239898640963
1 /*
2 * Converts filenames from decomposed unicode into precomposed unicode.
3 * Used on MacOS X.
4 */
6 #define PRECOMPOSE_UNICODE_C
8 #include "cache.h"
9 #include "utf8.h"
10 #include "precompose_utf8.h"
12 typedef char *iconv_ibp;
13 static const char *repo_encoding = "UTF-8";
14 static const char *path_encoding = "UTF-8-MAC";
16 static size_t has_non_ascii(const char *s, size_t maxlen, size_t *strlen_c)
18 const uint8_t *ptr = (const uint8_t *)s;
19 size_t strlen_chars = 0;
20 size_t ret = 0;
22 if (!ptr || !*ptr)
23 return 0;
25 while (*ptr && maxlen) {
26 if (*ptr & 0x80)
27 ret++;
28 strlen_chars++;
29 ptr++;
30 maxlen--;
32 if (strlen_c)
33 *strlen_c = strlen_chars;
35 return ret;
39 void probe_utf8_pathname_composition(void)
41 struct strbuf path = STRBUF_INIT;
42 static const char *auml_nfc = "\xc3\xa4";
43 static const char *auml_nfd = "\x61\xcc\x88";
44 int output_fd;
45 if (precomposed_unicode != -1)
46 return; /* We found it defined in the global config, respect it */
47 git_path_buf(&path, "%s", auml_nfc);
48 output_fd = open(path.buf, O_CREAT|O_EXCL|O_RDWR, 0600);
49 if (output_fd >= 0) {
50 close(output_fd);
51 git_path_buf(&path, "%s", auml_nfd);
52 precomposed_unicode = access(path.buf, R_OK) ? 0 : 1;
53 git_config_set("core.precomposeunicode", precomposed_unicode ? "true" : "false");
54 git_path_buf(&path, "%s", auml_nfc);
55 if (unlink(path.buf))
56 die_errno(_("failed to unlink '%s'"), path.buf);
58 strbuf_release(&path);
62 void precompose_argv(int argc, const char **argv)
64 int i = 0;
65 const char *oldarg;
66 char *newarg;
67 iconv_t ic_precompose;
69 if (precomposed_unicode != 1)
70 return;
72 ic_precompose = iconv_open(repo_encoding, path_encoding);
73 if (ic_precompose == (iconv_t) -1)
74 return;
76 while (i < argc) {
77 size_t namelen;
78 oldarg = argv[i];
79 if (has_non_ascii(oldarg, (size_t)-1, &namelen)) {
80 newarg = reencode_string_iconv(oldarg, namelen, ic_precompose, NULL);
81 if (newarg)
82 argv[i] = newarg;
84 i++;
86 iconv_close(ic_precompose);
90 PREC_DIR *precompose_utf8_opendir(const char *dirname)
92 PREC_DIR *prec_dir = xmalloc(sizeof(PREC_DIR));
93 prec_dir->dirent_nfc = xmalloc(sizeof(dirent_prec_psx));
94 prec_dir->dirent_nfc->max_name_len = sizeof(prec_dir->dirent_nfc->d_name);
96 prec_dir->dirp = opendir(dirname);
97 if (!prec_dir->dirp) {
98 free(prec_dir->dirent_nfc);
99 free(prec_dir);
100 return NULL;
101 } else {
102 int ret_errno = errno;
103 prec_dir->ic_precompose = iconv_open(repo_encoding, path_encoding);
104 /* if iconv_open() fails, die() in readdir() if needed */
105 errno = ret_errno;
108 return prec_dir;
111 struct dirent_prec_psx *precompose_utf8_readdir(PREC_DIR *prec_dir)
113 struct dirent *res;
114 res = readdir(prec_dir->dirp);
115 if (res) {
116 size_t namelenz = strlen(res->d_name) + 1; /* \0 */
117 size_t new_maxlen = namelenz;
119 int ret_errno = errno;
121 if (new_maxlen > prec_dir->dirent_nfc->max_name_len) {
122 size_t new_len = sizeof(dirent_prec_psx) + new_maxlen -
123 sizeof(prec_dir->dirent_nfc->d_name);
125 prec_dir->dirent_nfc = xrealloc(prec_dir->dirent_nfc, new_len);
126 prec_dir->dirent_nfc->max_name_len = new_maxlen;
129 prec_dir->dirent_nfc->d_ino = res->d_ino;
130 prec_dir->dirent_nfc->d_type = res->d_type;
132 if ((precomposed_unicode == 1) && has_non_ascii(res->d_name, (size_t)-1, NULL)) {
133 if (prec_dir->ic_precompose == (iconv_t)-1) {
134 die("iconv_open(%s,%s) failed, but needed:\n"
135 " precomposed unicode is not supported.\n"
136 " If you want to use decomposed unicode, run\n"
137 " \"git config core.precomposeunicode false\"\n",
138 repo_encoding, path_encoding);
139 } else {
140 iconv_ibp cp = (iconv_ibp)res->d_name;
141 size_t inleft = namelenz;
142 char *outpos = &prec_dir->dirent_nfc->d_name[0];
143 size_t outsz = prec_dir->dirent_nfc->max_name_len;
144 errno = 0;
145 iconv(prec_dir->ic_precompose, &cp, &inleft, &outpos, &outsz);
146 if (errno || inleft) {
148 * iconv() failed and errno could be E2BIG, EILSEQ, EINVAL, EBADF
149 * MacOS X avoids illegal byte sequemces.
150 * If they occur on a mounted drive (e.g. NFS) it is not worth to
151 * die() for that, but rather let the user see the original name
153 namelenz = 0; /* trigger strlcpy */
156 } else
157 namelenz = 0;
159 if (!namelenz)
160 strlcpy(prec_dir->dirent_nfc->d_name, res->d_name,
161 prec_dir->dirent_nfc->max_name_len);
163 errno = ret_errno;
164 return prec_dir->dirent_nfc;
166 return NULL;
170 int precompose_utf8_closedir(PREC_DIR *prec_dir)
172 int ret_value;
173 int ret_errno;
174 ret_value = closedir(prec_dir->dirp);
175 ret_errno = errno;
176 if (prec_dir->ic_precompose != (iconv_t)-1)
177 iconv_close(prec_dir->ic_precompose);
178 free(prec_dir->dirent_nfc);
179 free(prec_dir);
180 errno = ret_errno;
181 return ret_value;