compat / precompose_utf8.con commit l10n: Update git.pot (76 new, 4 removed messages) (3b6137f)
   1/*
   2 * Converts filenames from decomposed unicode into precomposed unicode.
   3 * Used on MacOS X.
   4*/
   5
   6
   7#define PRECOMPOSE_UNICODE_C
   8
   9#include "cache.h"
  10#include "utf8.h"
  11#include "precompose_utf8.h"
  12
  13typedef char *iconv_ibp;
  14const static char *repo_encoding = "UTF-8";
  15const static char *path_encoding = "UTF-8-MAC";
  16
  17
  18static size_t has_utf8(const char *s, size_t maxlen, size_t *strlen_c)
  19{
  20        const uint8_t *utf8p = (const uint8_t*) s;
  21        size_t strlen_chars = 0;
  22        size_t ret = 0;
  23
  24        if ((!utf8p) || (!*utf8p)) {
  25                return 0;
  26        }
  27
  28        while((*utf8p) && maxlen) {
  29                if (*utf8p & 0x80)
  30                        ret++;
  31                strlen_chars++;
  32                utf8p++;
  33                maxlen--;
  34        }
  35        if (strlen_c)
  36                *strlen_c = strlen_chars;
  37
  38        return ret;
  39}
  40
  41
  42void probe_utf8_pathname_composition(char *path, int len)
  43{
  44        const static char *auml_nfc = "\xc3\xa4";
  45        const static char *auml_nfd = "\x61\xcc\x88";
  46        int output_fd;
  47        if (precomposed_unicode != -1)
  48                return; /* We found it defined in the global config, respect it */
  49        path[len] = 0;
  50        strcpy(path + len, auml_nfc);
  51        output_fd = open(path, O_CREAT|O_EXCL|O_RDWR, 0600);
  52        if (output_fd >=0) {
  53                close(output_fd);
  54                path[len] = 0;
  55                strcpy(path + len, auml_nfd);
  56                /* Indicate to the user, that we can configure it to true */
  57                if (0 == access(path, R_OK))
  58                        git_config_set("core.precomposeunicode", "false");
  59                        /* To be backward compatible, set precomposed_unicode to 0 */
  60                precomposed_unicode = 0;
  61                path[len] = 0;
  62                strcpy(path + len, auml_nfc);
  63                unlink(path);
  64        }
  65}
  66
  67
  68void precompose_argv(int argc, const char **argv)
  69{
  70        int i = 0;
  71        const char *oldarg;
  72        char *newarg;
  73        iconv_t ic_precompose;
  74
  75        if (precomposed_unicode != 1)
  76                return;
  77
  78        ic_precompose = iconv_open(repo_encoding, path_encoding);
  79        if (ic_precompose == (iconv_t) -1)
  80                return;
  81
  82        while (i < argc) {
  83                size_t namelen;
  84                oldarg = argv[i];
  85                if (has_utf8(oldarg, (size_t)-1, &namelen)) {
  86                        newarg = reencode_string_iconv(oldarg, namelen, ic_precompose);
  87                        if (newarg)
  88                                argv[i] = newarg;
  89                }
  90                i++;
  91        }
  92        iconv_close(ic_precompose);
  93}
  94
  95
  96PREC_DIR *precompose_utf8_opendir(const char *dirname)
  97{
  98        PREC_DIR *prec_dir = xmalloc(sizeof(PREC_DIR));
  99        prec_dir->dirent_nfc = xmalloc(sizeof(dirent_prec_psx));
 100        prec_dir->dirent_nfc->max_name_len = sizeof(prec_dir->dirent_nfc->d_name);
 101
 102        prec_dir->dirp = opendir(dirname);
 103        if (!prec_dir->dirp) {
 104                free(prec_dir->dirent_nfc);
 105                free(prec_dir);
 106                return NULL;
 107        } else {
 108                int ret_errno = errno;
 109                prec_dir->ic_precompose = iconv_open(repo_encoding, path_encoding);
 110                /* if iconv_open() fails, die() in readdir() if needed */
 111                errno = ret_errno;
 112        }
 113
 114        return prec_dir;
 115}
 116
 117struct dirent_prec_psx *precompose_utf8_readdir(PREC_DIR *prec_dir)
 118{
 119        struct dirent *res;
 120        res = readdir(prec_dir->dirp);
 121        if (res) {
 122                size_t namelenz = strlen(res->d_name) + 1; /* \0 */
 123                size_t new_maxlen = namelenz;
 124
 125                int ret_errno = errno;
 126
 127                if (new_maxlen > prec_dir->dirent_nfc->max_name_len) {
 128                        size_t new_len = sizeof(dirent_prec_psx) + new_maxlen -
 129                                sizeof(prec_dir->dirent_nfc->d_name);
 130
 131                        prec_dir->dirent_nfc = xrealloc(prec_dir->dirent_nfc, new_len);
 132                        prec_dir->dirent_nfc->max_name_len = new_maxlen;
 133                }
 134
 135                prec_dir->dirent_nfc->d_ino  = res->d_ino;
 136                prec_dir->dirent_nfc->d_type = res->d_type;
 137
 138                if ((precomposed_unicode == 1) && has_utf8(res->d_name, (size_t)-1, NULL)) {
 139                        if (prec_dir->ic_precompose == (iconv_t)-1) {
 140                                die("iconv_open(%s,%s) failed, but needed:\n"
 141                                                "    precomposed unicode is not supported.\n"
 142                                                "    If you wnat to use decomposed unicode, run\n"
 143                                                "    \"git config core.precomposeunicode false\"\n",
 144                                                repo_encoding, path_encoding);
 145                        } else {
 146                                iconv_ibp       cp = (iconv_ibp)res->d_name;
 147                                size_t inleft = namelenz;
 148                                char *outpos = &prec_dir->dirent_nfc->d_name[0];
 149                                size_t outsz = prec_dir->dirent_nfc->max_name_len;
 150                                size_t cnt;
 151                                errno = 0;
 152                                cnt = iconv(prec_dir->ic_precompose, &cp, &inleft, &outpos, &outsz);
 153                                if (errno || inleft) {
 154                                        /*
 155                                         * iconv() failed and errno could be E2BIG, EILSEQ, EINVAL, EBADF
 156                                         * MacOS X avoids illegal byte sequemces.
 157                                         * If they occur on a mounted drive (e.g. NFS) it is not worth to
 158                                         * die() for that, but rather let the user see the original name
 159                                        */
 160                                        namelenz = 0; /* trigger strlcpy */
 161                                }
 162                        }
 163                }
 164                else
 165                        namelenz = 0;
 166
 167                if (!namelenz)
 168                        strlcpy(prec_dir->dirent_nfc->d_name, res->d_name,
 169                                                        prec_dir->dirent_nfc->max_name_len);
 170
 171                errno = ret_errno;
 172                return prec_dir->dirent_nfc;
 173        }
 174        return NULL;
 175}
 176
 177
 178int precompose_utf8_closedir(PREC_DIR *prec_dir)
 179{
 180        int ret_value;
 181        int ret_errno;
 182        ret_value = closedir(prec_dir->dirp);
 183        ret_errno = errno;
 184        if (prec_dir->ic_precompose != (iconv_t)-1)
 185                iconv_close(prec_dir->ic_precompose);
 186        free(prec_dir->dirent_nfc);
 187        free(prec_dir);
 188        errno = ret_errno;
 189        return ret_value;
 190}