/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2006-2013. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
/*
* Darwin needs conversion!
* http://developer.apple.com/library/mac/#qa/qa2001/qa1235.html
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "sys.h"
#include "global.h"
#if defined(__APPLE__) && defined(__MACH__) && !defined(__DARWIN__)
#define __DARWIN__ 1
#endif
#if !defined(__WIN32__)
#include <locale.h>
#if !defined(HAVE_SETLOCALE) || !defined(HAVE_NL_LANGINFO) || !defined(HAVE_LANGINFO_H)
#define PRIMITIVE_UTF8_CHECK 1
#else
#include <langinfo.h>
#endif
#endif
/* Written once and only once */
static int filename_encoding = ERL_FILENAME_UNKNOWN;
static int filename_warning = ERL_FILENAME_WARNING_WARNING;
#if defined(__WIN32__) || defined(__DARWIN__)
/* Default unicode on windows and MacOS X */
static int user_filename_encoding = ERL_FILENAME_UTF8;
#else
static int user_filename_encoding = ERL_FILENAME_LATIN1;
#endif
/* This controls the heuristic in printing characters in shell and w/
io:format("~tp", ...) etc. */
static int printable_character_set = ERL_PRINTABLE_CHARACTERS_LATIN1;
void erts_set_user_requested_filename_encoding(int encoding, int warning)
{
user_filename_encoding = encoding;
filename_warning = warning;
}
int erts_get_user_requested_filename_encoding(void)
{
return user_filename_encoding;
}
int erts_get_filename_warning_type(void)
{
return filename_warning;
}
void erts_set_printable_characters(int range) {
/* Not an atomic */
printable_character_set = range;
}
int erts_get_printable_characters(void) {
return printable_character_set;
}
void erts_init_sys_common_misc(void)
{
#if defined(__WIN32__)
/* win_efile will totally fail if this is not set. */
filename_encoding = ERL_FILENAME_WIN_WCHAR;
#else
if (user_filename_encoding != ERL_FILENAME_UNKNOWN) {
filename_encoding = user_filename_encoding;
} else {
char *l;
filename_encoding = ERL_FILENAME_LATIN1;
# ifdef PRIMITIVE_UTF8_CHECK
setlocale(LC_CTYPE, ""); /* Set international environment,
ignore result */
if (((l = getenv("LC_ALL")) && *l) ||
((l = getenv("LC_CTYPE")) && *l) ||
((l = getenv("LANG")) && *l)) {
if (strstr(l, "UTF-8")) {
filename_encoding = ERL_FILENAME_UTF8;
}
}
# else
l = setlocale(LC_CTYPE, ""); /* Set international environment */
if (l != NULL) {
if (strcmp(nl_langinfo(CODESET), "UTF-8") == 0) {
filename_encoding = ERL_FILENAME_UTF8;
}
}
# endif
}
# if defined(__DARWIN__)
if (filename_encoding == ERL_FILENAME_UTF8) {
filename_encoding = ERL_FILENAME_UTF8_MAC;
}
# endif
#endif
}
int erts_get_native_filename_encoding(void)
{
return filename_encoding;
}
/* For internal use by sys_double_to_chars_fast() */
static char* find_first_trailing_zero(char* p)
{
for (; *(p-1) == '0'; --p);
if (*(p-1) == '.') ++p;
return p;
}
int
sys_double_to_chars(double fp, char *buffer, size_t buffer_size)
{
return sys_double_to_chars_ext(fp, buffer, buffer_size, SYS_DEFAULT_FLOAT_DECIMALS);
}
/* Convert float to string using fixed point notation.
* decimals must be >= 0
* if compact != 0, the trailing 0's will be truncated
*/
int
sys_double_to_chars_fast(double f, char *buffer, int buffer_size, int decimals,
int compact)
{
/* Note that some C compilers don't support "static const" propagation
* so we use a defines */
#define SYS_DOUBLE_RND_CONST 0.55555555555555555
#define FRAC_SIZE 52
#define EXP_SIZE 11
#define EXP_MASK ((1ll << EXP_SIZE) - 1)
#define MAX_DECIMALS (sizeof(cs_sys_double_pow10) \
/ sizeof(cs_sys_double_pow10[0]))
#define FRAC_MASK ((1ll << FRAC_SIZE) - 1)
#define FRAC_MASK2 ((1ll << (FRAC_SIZE + 1)) - 1)
#define MAX_FLOAT (1ll << (FRAC_SIZE+1))
static const double cs_sys_double_pow10[] = {
SYS_DOUBLE_RND_CONST / 1ll,
SYS_DOUBLE_RND_CONST / 10ll,
SYS_DOUBLE_RND_CONST / 100ll,
SYS_DOUBLE_RND_CONST / 1000ll,
SYS_DOUBLE_RND_CONST / 10000ll,
SYS_DOUBLE_RND_CONST / 100000ll,
SYS_DOUBLE_RND_CONST / 1000000ll,
SYS_DOUBLE_RND_CONST / 10000000ll,
SYS_DOUBLE_RND_CONST / 100000000ll,
SYS_DOUBLE_RND_CONST / 1000000000ll,
SYS_DOUBLE_RND_CONST / 10000000000ll,
SYS_DOUBLE_RND_CONST / 100000000000ll,
SYS_DOUBLE_RND_CONST / 1000000000000ll,
SYS_DOUBLE_RND_CONST / 10000000000000ll,
SYS_DOUBLE_RND_CONST / 100000000000000ll,
SYS_DOUBLE_RND_CONST / 1000000000000000ll,
SYS_DOUBLE_RND_CONST / 10000000000000000ll,
SYS_DOUBLE_RND_CONST / 100000000000000000ll,
SYS_DOUBLE_RND_CONST / 1000000000000000000ll
};
long long mantissa, int_part = 0, frac_part = 0;
short exp;
int max;
int neg;
double fr;
union { long long L; double F; } x;
char *p = buffer;
if (decimals < 0)
return -1;
/* Round the number to given decimal places. The number of 5's in the
* SYS_DOUBLE_RND_CONST constant is chosen such that adding any more 5's doesn't
* change the double precision of the number, i.e.:
* 1> term_to_binary(0.55555555555555555, [{minor_version, 1}]).
* <<131,70,63,225,199,28,113,199,28,114>>
* 2> term_to_binary(0.5555555555555555555, [{minor_version, 1}]).
* <<131,70,63,225,199,28,113,199,28,114>>
*/
if (f >= 0) {
neg = 0;
fr = decimals < MAX_DECIMALS ? (f + cs_sys_double_pow10[decimals]) : f;
x.F = fr;
} else {
neg = 1;
fr = decimals < MAX_DECIMALS ? (f - cs_sys_double_pow10[decimals]) : f;
x.F = -fr;
}
exp = (x.L >> FRAC_SIZE) & EXP_MASK;
mantissa = x.L & FRAC_MASK;
if (exp == EXP_MASK) {
if (mantissa == 0) {
if (neg)
*p++ = '-';
*p++ = 'i';
*p++ = 'n';
*p++ = 'f';
} else {
*p++ = 'n';
*p++ = 'a';
*p++ = 'n';
}
*p = '\0';
return p - buffer;
}
exp -= EXP_MASK >> 1;
mantissa |= (1ll << FRAC_SIZE);
/* Don't bother with optimizing too large numbers or too large precision */
if (x.F > MAX_FLOAT || decimals >= MAX_DECIMALS) {
int len = erts_snprintf(buffer, buffer_size, "%.*f", decimals, f);
char* p = buffer + len;
if (len >= buffer_size)
return -1;
/* Delete trailing zeroes */
if (compact)
p = find_first_trailing_zero(p);
*p = '\0';
return p - buffer;
} else if (exp >= FRAC_SIZE) {
int_part = mantissa << (exp - FRAC_SIZE);
} else if (exp >= 0) {
int_part = mantissa >> (FRAC_SIZE - exp);
frac_part = (mantissa << (exp + 1)) & FRAC_MASK2;
} else /* if (exp < 0) */ {
frac_part = (mantissa & FRAC_MASK2) >> -(exp + 1);
}
if (!int_part) {
if (neg)
*p++ = '-';
*p++ = '0';
} else {
int ret, i, n;
while (int_part != 0) {
long long j = int_part / 10;
*p++ = (char)(int_part - ((j << 3) + (j << 1)) + '0');
int_part = j;
}
if (neg)
*p++ = '-';
/* Reverse string */
ret = p - buffer;
for (i = 0, n = ret/2; i < n; i++) {
int j = ret - i - 1;
char c = buffer[i];
buffer[i] = buffer[j];
buffer[j] = c;
}
}
if (decimals > 0) {
int i;
*p++ = '.';
max = buffer_size - (p - buffer) - 1 /* leave room for trailing '\0' */;
if (decimals > max)
return -1; /* the number is not large enough to fit in the buffer */
max = decimals;
for (i = 0; i < max; i++) {
/* frac_part *= 10; */
frac_part = (frac_part << 3) + (frac_part << 1);
*p++ = (char)((frac_part >> (FRAC_SIZE + 1)) + '0');
frac_part &= FRAC_MASK2;
}
/* Delete trailing zeroes */
if (compact)
p = find_first_trailing_zero(p);
}
*p = '\0';
return p - buffer;
}
