/** @file | |
stringlib: locale related helpers implementation. | |
Copyright (c) 2011, Intel Corporation. All rights reserved.<BR> | |
This program and the accompanying materials are licensed and made available under | |
the terms and conditions of the BSD License that accompanies this distribution. | |
The full text of the license may be found at | |
http://opensource.org/licenses/bsd-license. | |
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, | |
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. | |
**/ | |
#ifndef STRINGLIB_LOCALEUTIL_H | |
#define STRINGLIB_LOCALEUTIL_H | |
#include <locale.h> | |
// Prevent conflicts with EFI | |
#undef MAX | |
#undef MIN | |
#define MAX(x, y) ((x) < (y) ? (y) : (x)) | |
#define MIN(x, y) ((x) < (y) ? (x) : (y)) | |
typedef struct { | |
const char *grouping; | |
char previous; | |
Py_ssize_t i; /* Where we're currently pointing in grouping. */ | |
} GroupGenerator; | |
static void | |
_GroupGenerator_init(GroupGenerator *self, const char *grouping) | |
{ | |
self->grouping = grouping; | |
self->i = 0; | |
self->previous = 0; | |
} | |
/* Returns the next grouping, or 0 to signify end. */ | |
static Py_ssize_t | |
_GroupGenerator_next(GroupGenerator *self) | |
{ | |
/* Note that we don't really do much error checking here. If a | |
grouping string contains just CHAR_MAX, for example, then just | |
terminate the generator. That shouldn't happen, but at least we | |
fail gracefully. */ | |
switch (self->grouping[self->i]) { | |
case 0: | |
return self->previous; | |
case CHAR_MAX: | |
/* Stop the generator. */ | |
return 0; | |
default: { | |
char ch = self->grouping[self->i]; | |
self->previous = ch; | |
self->i++; | |
return (Py_ssize_t)ch; | |
} | |
} | |
} | |
/* Fill in some digits, leading zeros, and thousands separator. All | |
are optional, depending on when we're called. */ | |
static void | |
fill(STRINGLIB_CHAR **digits_end, STRINGLIB_CHAR **buffer_end, | |
Py_ssize_t n_chars, Py_ssize_t n_zeros, const char* thousands_sep, | |
Py_ssize_t thousands_sep_len) | |
{ | |
#if STRINGLIB_IS_UNICODE | |
Py_ssize_t i; | |
#endif | |
if (thousands_sep) { | |
*buffer_end -= thousands_sep_len; | |
/* Copy the thousands_sep chars into the buffer. */ | |
#if STRINGLIB_IS_UNICODE | |
/* Convert from the char's of the thousands_sep from | |
the locale into unicode. */ | |
for (i = 0; i < thousands_sep_len; ++i) | |
(*buffer_end)[i] = thousands_sep[i]; | |
#else | |
/* No conversion, just memcpy the thousands_sep. */ | |
memcpy(*buffer_end, thousands_sep, thousands_sep_len); | |
#endif | |
} | |
*buffer_end -= n_chars; | |
*digits_end -= n_chars; | |
memcpy(*buffer_end, *digits_end, n_chars * sizeof(STRINGLIB_CHAR)); | |
*buffer_end -= n_zeros; | |
STRINGLIB_FILL(*buffer_end, '0', n_zeros); | |
} | |
/** | |
* _Py_InsertThousandsGrouping: | |
* @buffer: A pointer to the start of a string. | |
* @n_buffer: Number of characters in @buffer. | |
* @digits: A pointer to the digits we're reading from. If count | |
* is non-NULL, this is unused. | |
* @n_digits: The number of digits in the string, in which we want | |
* to put the grouping chars. | |
* @min_width: The minimum width of the digits in the output string. | |
* Output will be zero-padded on the left to fill. | |
* @grouping: see definition in localeconv(). | |
* @thousands_sep: see definition in localeconv(). | |
* | |
* There are 2 modes: counting and filling. If @buffer is NULL, | |
* we are in counting mode, else filling mode. | |
* If counting, the required buffer size is returned. | |
* If filling, we know the buffer will be large enough, so we don't | |
* need to pass in the buffer size. | |
* Inserts thousand grouping characters (as defined by grouping and | |
* thousands_sep) into the string between buffer and buffer+n_digits. | |
* | |
* Return value: 0 on error, else 1. Note that no error can occur if | |
* count is non-NULL. | |
* | |
* This name won't be used, the includer of this file should define | |
* it to be the actual function name, based on unicode or string. | |
* | |
* As closely as possible, this code mimics the logic in decimal.py's | |
_insert_thousands_sep(). | |
**/ | |
Py_ssize_t | |
_Py_InsertThousandsGrouping(STRINGLIB_CHAR *buffer, | |
Py_ssize_t n_buffer, | |
STRINGLIB_CHAR *digits, | |
Py_ssize_t n_digits, | |
Py_ssize_t min_width, | |
const char *grouping, | |
const char *thousands_sep) | |
{ | |
Py_ssize_t count = 0; | |
Py_ssize_t n_zeros; | |
int loop_broken = 0; | |
int use_separator = 0; /* First time through, don't append the | |
separator. They only go between | |
groups. */ | |
STRINGLIB_CHAR *buffer_end = NULL; | |
STRINGLIB_CHAR *digits_end = NULL; | |
Py_ssize_t l; | |
Py_ssize_t n_chars; | |
Py_ssize_t thousands_sep_len = strlen(thousands_sep); | |
Py_ssize_t remaining = n_digits; /* Number of chars remaining to | |
be looked at */ | |
/* A generator that returns all of the grouping widths, until it | |
returns 0. */ | |
GroupGenerator groupgen; | |
_GroupGenerator_init(&groupgen, grouping); | |
if (buffer) { | |
buffer_end = buffer + n_buffer; | |
digits_end = digits + n_digits; | |
} | |
while ((l = _GroupGenerator_next(&groupgen)) > 0) { | |
l = MIN(l, MAX(MAX(remaining, min_width), 1)); | |
n_zeros = MAX(0, l - remaining); | |
n_chars = MAX(0, MIN(remaining, l)); | |
/* Use n_zero zero's and n_chars chars */ | |
/* Count only, don't do anything. */ | |
count += (use_separator ? thousands_sep_len : 0) + n_zeros + n_chars; | |
if (buffer) { | |
/* Copy into the output buffer. */ | |
fill(&digits_end, &buffer_end, n_chars, n_zeros, | |
use_separator ? thousands_sep : NULL, thousands_sep_len); | |
} | |
/* Use a separator next time. */ | |
use_separator = 1; | |
remaining -= n_chars; | |
min_width -= l; | |
if (remaining <= 0 && min_width <= 0) { | |
loop_broken = 1; | |
break; | |
} | |
min_width -= thousands_sep_len; | |
} | |
if (!loop_broken) { | |
/* We left the loop without using a break statement. */ | |
l = MAX(MAX(remaining, min_width), 1); | |
n_zeros = MAX(0, l - remaining); | |
n_chars = MAX(0, MIN(remaining, l)); | |
/* Use n_zero zero's and n_chars chars */ | |
count += (use_separator ? thousands_sep_len : 0) + n_zeros + n_chars; | |
if (buffer) { | |
/* Copy into the output buffer. */ | |
fill(&digits_end, &buffer_end, n_chars, n_zeros, | |
use_separator ? thousands_sep : NULL, thousands_sep_len); | |
} | |
} | |
return count; | |
} | |
/** | |
* _Py_InsertThousandsGroupingLocale: | |
* @buffer: A pointer to the start of a string. | |
* @n_digits: The number of digits in the string, in which we want | |
* to put the grouping chars. | |
* | |
* Reads thee current locale and calls _Py_InsertThousandsGrouping(). | |
**/ | |
Py_ssize_t | |
_Py_InsertThousandsGroupingLocale(STRINGLIB_CHAR *buffer, | |
Py_ssize_t n_buffer, | |
STRINGLIB_CHAR *digits, | |
Py_ssize_t n_digits, | |
Py_ssize_t min_width) | |
{ | |
struct lconv *locale_data = localeconv(); | |
const char *grouping = locale_data->grouping; | |
const char *thousands_sep = locale_data->thousands_sep; | |
return _Py_InsertThousandsGrouping(buffer, n_buffer, digits, n_digits, | |
min_width, grouping, thousands_sep); | |
} | |
#endif /* STRINGLIB_LOCALEUTIL_H */ |