diff options
Diffstat (limited to 'fontconfig/src/fclang.c')
| -rw-r--r-- | fontconfig/src/fclang.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/fontconfig/src/fclang.c b/fontconfig/src/fclang.c index be42b58c4..b7e70fcfb 100644 --- a/fontconfig/src/fclang.c +++ b/fontconfig/src/fclang.c @@ -22,6 +22,7 @@ * PERFORMANCE OF THIS SOFTWARE. */ +#include <string.h> #include "fcint.h" #include "fcftint.h" @@ -43,6 +44,9 @@ struct _FcLangSet { FcChar32 map[NUM_LANG_SET_MAP]; }; +static int FcLangSetIndex (const FcChar8 *lang); + + static void FcLangSetBitSet (FcLangSet *ls, unsigned int id) @@ -173,6 +177,161 @@ FcFreeTypeLangSet (const FcCharSet *charset, return ls; } +FcChar8 * +FcLangNormalize (const FcChar8 *lang) +{ + FcChar8 *result = NULL, *s, *orig; + char *territory, *encoding, *modifier; + size_t llen, tlen = 0, mlen = 0; + + if (!lang || !*lang) + return NULL; + + if (FcStrCmpIgnoreCase (lang, (const FcChar8 *)"C") == 0 || + FcStrCmpIgnoreCase (lang, (const FcChar8 *)"POSIX") == 0) + { + result = FcStrCopy ((const FcChar8 *)"en"); + goto bail; + } + + s = FcStrCopy (lang); + if (!s) + goto bail; + + /* from the comments in glibc: + * + * LOCALE can consist of up to four recognized parts for the XPG syntax: + * + * language[_territory[.codeset]][@modifier] + * + * Beside the first all of them are allowed to be missing. If the + * full specified locale is not found, the less specific one are + * looked for. The various part will be stripped off according to + * the following order: + * (1) codeset + * (2) normalized codeset + * (3) territory + * (4) modifier + * + * So since we don't take care of the codeset part here, what patterns + * we need to deal with is: + * + * 1. language_territory@modifier + * 2. language@modifier + * 3. language + * + * then. and maybe no need to try language_territory here. + */ + modifier = strchr ((const char *) s, '@'); + if (modifier) + { + *modifier = 0; + modifier++; + mlen = strlen (modifier); + } + encoding = strchr ((const char *) s, '.'); + if (encoding) + { + *encoding = 0; + encoding++; + if (modifier) + { + memmove (encoding, modifier, mlen + 1); + modifier = encoding; + } + } + territory = strchr ((const char *) s, '_'); + if (!territory) + territory = strchr ((const char *) s, '-'); + if (territory) + { + *territory = 0; + territory++; + tlen = strlen (territory); + } + llen = strlen ((const char *) s); + if (llen < 2 || llen > 3) + { + fprintf (stderr, "Fontconfig warning: ignoring %s: not a valid language tag\n", + lang); + goto bail0; + } + if (territory && (tlen < 2 || tlen > 3)) + { + fprintf (stderr, "Fontconfig warning: ignoring %s: not a valid region tag\n", + lang); + goto bail0; + } + if (territory) + territory[-1] = '-'; + if (modifier) + modifier[-1] = '@'; + orig = FcStrDowncase (s); + if (!orig) + goto bail0; + if (territory) + { + if (FcDebug () & FC_DBG_LANGSET) + printf("Checking the existence of %s.orth\n", s); + if (FcLangSetIndex (s) < 0) + { + memmove (territory - 1, territory + tlen, (mlen > 0 ? mlen + 1 : 0) + 1); + if (modifier) + modifier = territory; + } + else + { + result = s; + s = NULL; + goto bail1; + } + } + if (modifier) + { + if (FcDebug () & FC_DBG_LANGSET) + printf("Checking the existence of %s.orth\n", s); + if (FcLangSetIndex (s) < 0) + modifier[-1] = 0; + else + { + result = s; + s = NULL; + goto bail1; + } + } + if (FcDebug () & FC_DBG_LANGSET) + printf("Checking the existence of %s.orth\n", s); + if (FcLangSetIndex (s) < 0) + { + /* there seems no languages matched in orth. + * add the language as is for fallback. + */ + result = orig; + orig = NULL; + } + else + { + result = s; + s = NULL; + } + bail1: + if (orig) + free (orig); + bail0: + if (s) + free (s); + bail: + if (FcDebug () & FC_DBG_LANGSET) + { + if (result) + printf ("normalized: %s -> %s\n", lang, result); + else + printf ("Unable to normalize %s\n", lang); + } + + return result; +} + #define FcLangEnd(c) ((c) == '-' || (c) == '\0') FcLangResult |