/***********************************************************
Copyright (C) 1997, 2002 Martin von Loewis

Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies.

This software comes with no warranty. Use at your own risk.

******************************************************************/

#include "Python.h"

#include <stdio.h>
#include <errno.h>
#include <locale.h>
#include <string.h>
#include <ctype.h>

#ifdef HAVE_LANGINFO_H
#include <langinfo.h>
#endif

#if defined(MS_WIN32)
#define WINDOWS_LEAN_AND_MEAN
#include <windows.h>
#endif

#ifdef macintosh
#include "macglue.h"
#endif

#ifdef RISCOS
char *strdup(const char *);
#endif

static char locale__doc__[] = "Support for POSIX locales.";

static PyObject *Error;

/* support functions for formatting floating point numbers */

static char setlocale__doc__[] =
"(integer,string=None) -> string. Activates/queries locale processing."
;

/* to record the LC_NUMERIC settings */
static PyObject* grouping = NULL;
static PyObject* thousands_sep = NULL;
static PyObject* decimal_point = NULL;
/* if non-null, indicates that LC_NUMERIC is different from "C" */
static char* saved_numeric = NULL;

/* the grouping is terminated by either 0 or CHAR_MAX */
static PyObject*
copy_grouping(char* s)
{
    int i;
    PyObject *result, *val = NULL;

    if (s[0] == '\0')
        /* empty string: no grouping at all */
        return PyList_New(0);

    for (i = 0; s[i] != '\0' && s[i] != CHAR_MAX; i++)
        ; /* nothing */

    result = PyList_New(i+1);
    if (!result)
        return NULL;

    i = -1;
    do {
        i++;
        val = PyInt_FromLong(s[i]);
        if (!val)
            break;
        if (PyList_SetItem(result, i, val)) {
            Py_DECREF(val);
            val = NULL;
            break;
        }
    } while (s[i] != '\0' && s[i] != CHAR_MAX);

    if (!val) {
        Py_DECREF(result);
        return NULL;
    }

    return result;
}

static void
fixup_ulcase(void)
{
    PyObject *mods, *strop, *string, *ulo;
    unsigned char ul[256];
    int n, c;

    /* find the string and strop modules */
    mods = PyImport_GetModuleDict();
    if (!mods)
        return;
    string = PyDict_GetItemString(mods, "string");
    if (string)
        string = PyModule_GetDict(string);
    strop=PyDict_GetItemString(mods, "strop");
    if (strop)
        strop = PyModule_GetDict(strop);
    if (!string && !strop)
        return;

    /* create uppercase map string */
    n = 0;
    for (c = 0; c < 256; c++) {
        if (isupper(c))
            ul[n++] = c;
    }
    ulo = PyString_FromStringAndSize((const char *)ul, n);
    if (!ulo)
        return;
    if (string)
        PyDict_SetItemString(string, "uppercase", ulo);
    if (strop)
        PyDict_SetItemString(strop, "uppercase", ulo);
    Py_DECREF(ulo);

    /* create lowercase string */
    n = 0;
    for (c = 0; c < 256; c++) {
        if (islower(c))
            ul[n++] = c;
    }
    ulo = PyString_FromStringAndSize((const char *)ul, n);
    if (!ulo)
        return;
    if (string)
        PyDict_SetItemString(string, "lowercase", ulo);
    if (strop)
        PyDict_SetItemString(strop, "lowercase", ulo);
    Py_DECREF(ulo);

    /* create letters string */
    n = 0;
    for (c = 0; c < 256; c++) {
        if (isalpha(c))
            ul[n++] = c;
    }
    ulo = PyString_FromStringAndSize((const char *)ul, n);
    if (!ulo)
        return;
    if (string)
        PyDict_SetItemString(string, "letters", ulo);
    Py_DECREF(ulo);
}

#if defined(HAVE_LANGINFO_H) && defined(CODESET)
static int fileencoding_uses_locale = 0;
#endif

static PyObject*
PyLocale_setlocale(PyObject* self, PyObject* args)
{
    int category;
    char *locale = NULL, *result;
    PyObject *result_object;
    struct lconv *lc;

    if (!PyArg_ParseTuple(args, "i|z:setlocale", &category, &locale))
        return NULL;

    if (locale) {
        /* set locale */
        result = setlocale(category, locale);
        if (!result) {
            /* operation failed, no setting was changed */
            PyErr_SetString(Error, "locale setting not supported");
            return NULL;
        }
        result_object = PyString_FromString(result);
        if (!result)
            return NULL;
        /* record changes to LC_NUMERIC */
        if (category == LC_NUMERIC || category == LC_ALL) {
            if (strcmp(locale, "C") == 0 || strcmp(locale, "POSIX") == 0) {
                /* user just asked for default numeric locale */
                if (saved_numeric)
                    free(saved_numeric);
                saved_numeric = NULL;
            } else {
                /* remember values */
                lc = localeconv();
                Py_XDECREF(grouping);
                grouping = copy_grouping(lc->grouping);
                Py_XDECREF(thousands_sep);
                thousands_sep = PyString_FromString(lc->thousands_sep);
                Py_XDECREF(decimal_point);
                decimal_point = PyString_FromString(lc->decimal_point);
                saved_numeric = strdup(locale);
                /* restore to "C" */
                setlocale(LC_NUMERIC, "C");
            }
        }
        /* record changes to LC_CTYPE */
        if (category == LC_CTYPE || category == LC_ALL)
            fixup_ulcase();
        /* things that got wrong up to here are ignored */
        PyErr_Clear();
#if defined(HAVE_LANGINFO_H) && defined(CODESET)
	if (Py_FileSystemDefaultEncoding == NULL)
	    fileencoding_uses_locale = 1;
	if (fileencoding_uses_locale) {
	    char *codeset = nl_langinfo(CODESET);
	    PyObject *enc = NULL;
	    if (*codeset && (enc = PyCodec_Encoder(codeset))) {
		/* Release previous file encoding */
		if (Py_FileSystemDefaultEncoding)
		    free((char *)Py_FileSystemDefaultEncoding);
		Py_FileSystemDefaultEncoding = strdup(codeset);
		Py_DECREF(enc);
	    } else
		PyErr_Clear();
	}
#endif
    } else {
        /* get locale */
        /* restore LC_NUMERIC first, if appropriate */
        if (saved_numeric)
            setlocale(LC_NUMERIC, saved_numeric);
        result = setlocale(category, NULL);
        if (!result) {
            PyErr_SetString(Error, "locale query failed");
            return NULL;
        }
        result_object = PyString_FromString(result);
        /* restore back to "C" */
        if (saved_numeric)
            setlocale(LC_NUMERIC, "C");
    }
    return result_object;
}

static char localeconv__doc__[] =
"() -> dict. Returns numeric and monetary locale-specific parameters."
;

static PyObject*
PyLocale_localeconv(PyObject* self, PyObject* args)
{
    PyObject* result;
    struct lconv *l;
    PyObject *x;

    if (!PyArg_NoArgs(args))
        return NULL;

    result = PyDict_New();
    if (!result)
        return NULL;

    /* if LC_NUMERIC is different in the C library, use saved value */
    l = localeconv();

    /* hopefully, the localeconv result survives the C library calls
       involved herein */

#define RESULT_STRING(s)\
    x = PyString_FromString(l->s);\
    if (!x) goto failed;\
    PyDict_SetItemString(result, #s, x);\
    Py_XDECREF(x)

#define RESULT_INT(i)\
    x = PyInt_FromLong(l->i);\
    if (!x) goto failed;\
    PyDict_SetItemString(result, #i, x);\
    Py_XDECREF(x)

    /* Numeric information */
    if (saved_numeric){
        /* cannot use localeconv results */
        PyDict_SetItemString(result, "decimal_point", decimal_point);
        PyDict_SetItemString(result, "grouping", grouping);
        PyDict_SetItemString(result, "thousands_sep", thousands_sep);
    } else {
        RESULT_STRING(decimal_point);
        RESULT_STRING(thousands_sep);
        x = copy_grouping(l->grouping);
        if (!x)
            goto failed;
        PyDict_SetItemString(result, "grouping", x);
        Py_XDECREF(x);
    }

    /* Monetary information */
    RESULT_STRING(int_curr_symbol);
    RESULT_STRING(currency_symbol);
    RESULT_STRING(mon_decimal_point);
    RESULT_STRING(mon_thousands_sep);
    x = copy_grouping(l->mon_grouping);
    if (!x)
        goto failed;
    PyDict_SetItemString(result, "mon_grouping", x);
    Py_XDECREF(x);
    RESULT_STRING(positive_sign);
    RESULT_STRING(negative_sign);
    RESULT_INT(int_frac_digits);
    RESULT_INT(frac_digits);
    RESULT_INT(p_cs_precedes);
    RESULT_INT(p_sep_by_space);
    RESULT_INT(n_cs_precedes);
    RESULT_INT(n_sep_by_space);
    RESULT_INT(p_sign_posn);
    RESULT_INT(n_sign_posn);
    return result;

  failed:
    Py_XDECREF(result);
    Py_XDECREF(x);
    return NULL;
}

static char strcoll__doc__[] =
"string,string -> int. Compares two strings according to the locale."
;

static PyObject*
PyLocale_strcoll(PyObject* self, PyObject* args)
{
  char *s1,*s2;

  if (!PyArg_ParseTuple(args, "ss:strcoll", &s1, &s2))
      return NULL;
  return PyInt_FromLong(strcoll(s1, s2));
}

static char strxfrm__doc__[] =
"string -> string. Returns a string that behaves for cmp locale-aware."
;

static PyObject*
PyLocale_strxfrm(PyObject* self, PyObject* args)
{
    char *s, *buf;
    size_t n1, n2;
    PyObject *result;

    if (!PyArg_ParseTuple(args, "s:strxfrm", &s))
        return NULL;

    /* assume no change in size, first */
    n1 = strlen(s) + 1;
    buf = PyMem_Malloc(n1);
    if (!buf)
        return PyErr_NoMemory();
    n2 = strxfrm(buf, s, n1);
    if (n2 > n1) {
        /* more space needed */
        buf = PyMem_Realloc(buf, n2);
        if (!buf)
            return PyErr_NoMemory();
        strxfrm(buf, s, n2);
    }
    result = PyString_FromString(buf);
    PyMem_Free(buf);
    return result;
}

#if defined(MS_WIN32)
static PyObject*
PyLocale_getdefaultlocale(PyObject* self, PyObject* args)
{
    char encoding[100];
    char locale[100];

    if (!PyArg_NoArgs(args))
        return NULL;

    PyOS_snprintf(encoding, sizeof(encoding), "cp%d", GetACP());

    if (GetLocaleInfo(LOCALE_USER_DEFAULT,
                      LOCALE_SISO639LANGNAME,
                      locale, sizeof(locale))) {
        int i = strlen(locale);
        locale[i++] = '_';
        if (GetLocaleInfo(LOCALE_USER_DEFAULT,
                          LOCALE_SISO3166CTRYNAME,
                          locale+i, sizeof(locale)-i))
            return Py_BuildValue("ss", locale, encoding);
    }

    /* If we end up here, this windows version didn't know about
       ISO639/ISO3166 names (it's probably Windows 95).  Return the
       Windows language identifier instead (a hexadecimal number) */

    locale[0] = '0';
    locale[1] = 'x';
    if (GetLocaleInfo(LOCALE_USER_DEFAULT, LOCALE_IDEFAULTLANGUAGE,
                      locale+2, sizeof(locale)-2)) {
        return Py_BuildValue("ss", locale, encoding);
    }

    /* cannot determine the language code (very unlikely) */
    Py_INCREF(Py_None);
    return Py_BuildValue("Os", Py_None, encoding);
}
#endif

#if defined(macintosh)
static PyObject*
PyLocale_getdefaultlocale(PyObject* self, PyObject* args)
{
    return Py_BuildValue("Os", Py_None, PyMac_getscript());
}
#endif

#ifdef HAVE_LANGINFO_H
#define LANGINFO(X) {#X, X}
struct langinfo_constant{
	char* name;
	int value;
} langinfo_constants[] = 
{
    /* These constants should exist on any langinfo implementation */
    LANGINFO(DAY_1),
    LANGINFO(DAY_2),
    LANGINFO(DAY_3),
    LANGINFO(DAY_4),
    LANGINFO(DAY_5),
    LANGINFO(DAY_6),
    LANGINFO(DAY_7),

    LANGINFO(ABDAY_1),
    LANGINFO(ABDAY_2),
    LANGINFO(ABDAY_3),
    LANGINFO(ABDAY_4),
    LANGINFO(ABDAY_5),
    LANGINFO(ABDAY_6),
    LANGINFO(ABDAY_7),

    LANGINFO(MON_1),
    LANGINFO(MON_2),
    LANGINFO(MON_3),
    LANGINFO(MON_4),
    LANGINFO(MON_5),
    LANGINFO(MON_6),
    LANGINFO(MON_7),
    LANGINFO(MON_8),
    LANGINFO(MON_9),
    LANGINFO(MON_10),
    LANGINFO(MON_11),
    LANGINFO(MON_12),

    LANGINFO(ABMON_1),
    LANGINFO(ABMON_2),
    LANGINFO(ABMON_3),
    LANGINFO(ABMON_4),
    LANGINFO(ABMON_5),
    LANGINFO(ABMON_6),
    LANGINFO(ABMON_7),
    LANGINFO(ABMON_8),
    LANGINFO(ABMON_9),
    LANGINFO(ABMON_10),
    LANGINFO(ABMON_11),
    LANGINFO(ABMON_12),

#ifdef RADIXCHAR
    /* The following are not available with glibc 2.0 */
    LANGINFO(RADIXCHAR),
    LANGINFO(THOUSEP),
    /* YESSTR and NOSTR are deprecated in glibc, since they are
       a special case of message translation, which should be rather
       done using gettext. So we don't expose it to Python in the
       first place.
    LANGINFO(YESSTR),
    LANGINFO(NOSTR),
    */
    LANGINFO(CRNCYSTR),
#endif

    LANGINFO(D_T_FMT),
    LANGINFO(D_FMT),
    LANGINFO(T_FMT),
    LANGINFO(AM_STR),
    LANGINFO(PM_STR),

    /* The following constants are available only with XPG4, but...
       AIX 3.2. only has CODESET.
       OpenBSD doesn't have CODESET but has T_FMT_AMPM, and doesn't have
       a few of the others.
       Solution: ifdef-test them all. */
#ifdef CODESET
    LANGINFO(CODESET),
#endif
#ifdef T_FMT_AMPM
    LANGINFO(T_FMT_AMPM),
#endif
#ifdef ERA
    LANGINFO(ERA),
#endif
#ifdef ERA_D_FMT
    LANGINFO(ERA_D_FMT),
#endif
#ifdef ERA_D_T_FMT
    LANGINFO(ERA_D_T_FMT),
#endif
#ifdef ERA_T_FMT
    LANGINFO(ERA_T_FMT),
#endif
#ifdef ALT_DIGITS
    LANGINFO(ALT_DIGITS),
#endif
#ifdef YESEXPR
    LANGINFO(YESEXPR),
#endif
#ifdef NOEXPR
    LANGINFO(NOEXPR),
#endif
#ifdef _DATE_FMT
    /* This is not available in all glibc versions that have CODESET. */
    LANGINFO(_DATE_FMT),
#endif
    {0, 0}
};

static char nl_langinfo__doc__[] =
"nl_langinfo(key) -> string\n"
"Return the value for the locale information associated with key."
;

static PyObject*
PyLocale_nl_langinfo(PyObject* self, PyObject* args)
{
    int item, i;
    if (!PyArg_ParseTuple(args, "i:nl_langinfo", &item))
        return NULL;
    /* Check whether this is a supported constant. GNU libc sometimes
       returns numeric values in the char* return value, which would
       crash PyString_FromString.  */
    for (i = 0; langinfo_constants[i].name; i++)
	    if (langinfo_constants[i].value == item)
		    return PyString_FromString(nl_langinfo(item));
    PyErr_SetString(PyExc_ValueError, "unsupported langinfo constant");
    return NULL;
}
#endif /* HAVE_LANGINFO_H */
    

static struct PyMethodDef PyLocale_Methods[] = {
  {"setlocale", (PyCFunction) PyLocale_setlocale, 
   METH_VARARGS, setlocale__doc__},
  {"localeconv", (PyCFunction) PyLocale_localeconv, 
   0, localeconv__doc__},
  {"strcoll", (PyCFunction) PyLocale_strcoll, 
   METH_VARARGS, strcoll__doc__},
  {"strxfrm", (PyCFunction) PyLocale_strxfrm, 
   METH_VARARGS, strxfrm__doc__},
#if defined(MS_WIN32) || defined(macintosh)
  {"_getdefaultlocale", (PyCFunction) PyLocale_getdefaultlocale, 0},
#endif
#ifdef HAVE_LANGINFO_H
  {"nl_langinfo", (PyCFunction) PyLocale_nl_langinfo,
   METH_VARARGS, nl_langinfo__doc__},
#endif
  
  {NULL, NULL}
};

DL_EXPORT(void)
init_locale(void)
{
    PyObject *m, *d, *x;
#ifdef HAVE_LANGINFO_H
    int i;
#endif

    m = Py_InitModule("_locale", PyLocale_Methods);

    d = PyModule_GetDict(m);

    x = PyInt_FromLong(LC_CTYPE);
    PyDict_SetItemString(d, "LC_CTYPE", x);
    Py_XDECREF(x);

    x = PyInt_FromLong(LC_TIME);
    PyDict_SetItemString(d, "LC_TIME", x);
    Py_XDECREF(x);

    x = PyInt_FromLong(LC_COLLATE);
    PyDict_SetItemString(d, "LC_COLLATE", x);
    Py_XDECREF(x);

    x = PyInt_FromLong(LC_MONETARY);
    PyDict_SetItemString(d, "LC_MONETARY", x);
    Py_XDECREF(x);

#ifdef LC_MESSAGES
    x = PyInt_FromLong(LC_MESSAGES);
    PyDict_SetItemString(d, "LC_MESSAGES", x);
    Py_XDECREF(x);
#endif /* LC_MESSAGES */

    x = PyInt_FromLong(LC_NUMERIC);
    PyDict_SetItemString(d, "LC_NUMERIC", x);
    Py_XDECREF(x);

    x = PyInt_FromLong(LC_ALL);
    PyDict_SetItemString(d, "LC_ALL", x);
    Py_XDECREF(x);

    x = PyInt_FromLong(CHAR_MAX);
    PyDict_SetItemString(d, "CHAR_MAX", x);
    Py_XDECREF(x);

    Error = PyErr_NewException("locale.Error", NULL, NULL);
    PyDict_SetItemString(d, "Error", Error);

    x = PyString_FromString(locale__doc__);
    PyDict_SetItemString(d, "__doc__", x);
    Py_XDECREF(x);

#ifdef HAVE_LANGINFO_H
    for (i = 0; langinfo_constants[i].name; i++) {
	    PyModule_AddIntConstant(m, langinfo_constants[i].name,
				    langinfo_constants[i].value);
    }
#endif
}