diff options
Diffstat (limited to 'compat/precompose_utf8.c')
| -rw-r--r-- | compat/precompose_utf8.c | 197 |
1 files changed, 197 insertions, 0 deletions
diff --git a/compat/precompose_utf8.c b/compat/precompose_utf8.c new file mode 100644 index 0000000..cce1d57 --- /dev/null +++ b/compat/precompose_utf8.c @@ -0,0 +1,197 @@ +/* + * Converts filenames from decomposed unicode into precomposed unicode. + * Used on MacOS X. + */ + +#define PRECOMPOSE_UNICODE_C + +#include "cache.h" +#include "config.h" +#include "utf8.h" +#include "precompose_utf8.h" + +typedef char *iconv_ibp; +static const char *repo_encoding = "UTF-8"; +static const char *path_encoding = "UTF-8-MAC"; + +static size_t has_non_ascii(const char *s, size_t maxlen, size_t *strlen_c) +{ + const uint8_t *ptr = (const uint8_t *)s; + size_t strlen_chars = 0; + size_t ret = 0; + + if (!ptr || !*ptr) + return 0; + + while (*ptr && maxlen) { + if (*ptr & 0x80) + ret++; + strlen_chars++; + ptr++; + maxlen--; + } + if (strlen_c) + *strlen_c = strlen_chars; + + return ret; +} + + +void probe_utf8_pathname_composition(void) +{ + struct strbuf path = STRBUF_INIT; + static const char *auml_nfc = "\xc3\xa4"; + static const char *auml_nfd = "\x61\xcc\x88"; + int output_fd; + if (precomposed_unicode != -1) + return; /* We found it defined in the global config, respect it */ + git_path_buf(&path, "%s", auml_nfc); + output_fd = open(path.buf, O_CREAT|O_EXCL|O_RDWR, 0600); + if (output_fd >= 0) { + close(output_fd); + git_path_buf(&path, "%s", auml_nfd); + precomposed_unicode = access(path.buf, R_OK) ? 0 : 1; + git_config_set("core.precomposeunicode", + precomposed_unicode ? "true" : "false"); + git_path_buf(&path, "%s", auml_nfc); + if (unlink(path.buf)) + die_errno(_("failed to unlink '%s'"), path.buf); + } + strbuf_release(&path); +} + +const char *precompose_string_if_needed(const char *in) +{ + size_t inlen; + size_t outlen; + if (!in) + return NULL; + if (has_non_ascii(in, (size_t)-1, &inlen)) { + iconv_t ic_prec; + char *out; + if (precomposed_unicode < 0) + git_config_get_bool("core.precomposeunicode", &precomposed_unicode); + if (precomposed_unicode != 1) + return in; + ic_prec = iconv_open(repo_encoding, path_encoding); + if (ic_prec == (iconv_t) -1) + return in; + + out = reencode_string_iconv(in, inlen, ic_prec, 0, &outlen); + if (out) { + if (outlen == inlen && !memcmp(in, out, outlen)) + free(out); /* no need to return indentical */ + else + in = out; + } + iconv_close(ic_prec); + + } + return in; +} + +const char *precompose_argv_prefix(int argc, const char **argv, const char *prefix) +{ + int i = 0; + + while (i < argc) { + argv[i] = precompose_string_if_needed(argv[i]); + i++; + } + return precompose_string_if_needed(prefix); +} + + +PREC_DIR *precompose_utf8_opendir(const char *dirname) +{ + PREC_DIR *prec_dir = xmalloc(sizeof(PREC_DIR)); + prec_dir->dirent_nfc = xmalloc(sizeof(dirent_prec_psx)); + prec_dir->dirent_nfc->max_name_len = sizeof(prec_dir->dirent_nfc->d_name); + + prec_dir->dirp = opendir(dirname); + if (!prec_dir->dirp) { + free(prec_dir->dirent_nfc); + free(prec_dir); + return NULL; + } else { + int ret_errno = errno; + prec_dir->ic_precompose = iconv_open(repo_encoding, path_encoding); + /* if iconv_open() fails, die() in readdir() if needed */ + errno = ret_errno; + } + + return prec_dir; +} + +struct dirent_prec_psx *precompose_utf8_readdir(PREC_DIR *prec_dir) +{ + struct dirent *res; + res = readdir(prec_dir->dirp); + if (res) { + size_t namelenz = strlen(res->d_name) + 1; /* \0 */ + size_t new_maxlen = namelenz; + + int ret_errno = errno; + + if (new_maxlen > prec_dir->dirent_nfc->max_name_len) { + size_t new_len = sizeof(dirent_prec_psx) + new_maxlen - + sizeof(prec_dir->dirent_nfc->d_name); + + prec_dir->dirent_nfc = xrealloc(prec_dir->dirent_nfc, new_len); + prec_dir->dirent_nfc->max_name_len = new_maxlen; + } + + prec_dir->dirent_nfc->d_ino = res->d_ino; + prec_dir->dirent_nfc->d_type = res->d_type; + + if ((precomposed_unicode == 1) && has_non_ascii(res->d_name, (size_t)-1, NULL)) { + if (prec_dir->ic_precompose == (iconv_t)-1) { + die("iconv_open(%s,%s) failed, but needed:\n" + " precomposed unicode is not supported.\n" + " If you want to use decomposed unicode, run\n" + " \"git config core.precomposeunicode false\"\n", + repo_encoding, path_encoding); + } else { + iconv_ibp cp = (iconv_ibp)res->d_name; + size_t inleft = namelenz; + char *outpos = &prec_dir->dirent_nfc->d_name[0]; + size_t outsz = prec_dir->dirent_nfc->max_name_len; + errno = 0; + iconv(prec_dir->ic_precompose, &cp, &inleft, &outpos, &outsz); + if (errno || inleft) { + /* + * iconv() failed and errno could be E2BIG, EILSEQ, EINVAL, EBADF + * MacOS X avoids illegal byte sequences. + * If they occur on a mounted drive (e.g. NFS) it is not worth to + * die() for that, but rather let the user see the original name + */ + namelenz = 0; /* trigger strlcpy */ + } + } + } else + namelenz = 0; + + if (!namelenz) + strlcpy(prec_dir->dirent_nfc->d_name, res->d_name, + prec_dir->dirent_nfc->max_name_len); + + errno = ret_errno; + return prec_dir->dirent_nfc; + } + return NULL; +} + + +int precompose_utf8_closedir(PREC_DIR *prec_dir) +{ + int ret_value; + int ret_errno; + ret_value = closedir(prec_dir->dirp); + ret_errno = errno; + if (prec_dir->ic_precompose != (iconv_t)-1) + iconv_close(prec_dir->ic_precompose); + free(prec_dir->dirent_nfc); + free(prec_dir); + errno = ret_errno; + return ret_value; +} |