aboutsummaryrefslogtreecommitdiffstats
path: root/erts/emulator/sys/common/erl_sys_common_misc.c
blob: ba03a11405b9fc90c4fdd35ced9cd5d43117b23b (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
/*
 * %CopyrightBegin%
 * 
 * Copyright Ericsson AB 2006-2016. All Rights Reserved.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions 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

/*
 * erts_check_io_time is used by the erl_check_io implementation. The
 * global erts_check_io_time variable is declared here since there
 * (often) exist two versions of erl_check_io (kernel-poll and
 * non-kernel-poll), and we dont want two versions of this variable.
 */
erts_smp_atomic_t erts_check_io_time;

/* 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_UNKNOWN;
#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)
{
    #define SYS_DOUBLE_RND_CONST 0.5
    #define FRAC_SIZE            52
    #define EXP_SIZE             11
    #define EXP_MASK             (((Uint64)1 << EXP_SIZE) - 1)
    #define MAX_DECIMALS         (sizeof(cs_sys_double_pow10) \
				   / sizeof(cs_sys_double_pow10[0]))
    #define FRAC_MASK            (((Uint64)1 << FRAC_SIZE) - 1)
    #define FRAC_MASK2           (((Uint64)1 << (FRAC_SIZE + 1)) - 1)
    #define MAX_FLOAT            ((Uint64)1 << (FRAC_SIZE+1))

    static const double cs_sys_double_pow10[] = {
        SYS_DOUBLE_RND_CONST / 1e0,
        SYS_DOUBLE_RND_CONST / 1e1,
        SYS_DOUBLE_RND_CONST / 1e2,
        SYS_DOUBLE_RND_CONST / 1e3,
        SYS_DOUBLE_RND_CONST / 1e4,
        SYS_DOUBLE_RND_CONST / 1e5,
        SYS_DOUBLE_RND_CONST / 1e6,
        SYS_DOUBLE_RND_CONST / 1e7,
        SYS_DOUBLE_RND_CONST / 1e8,
        SYS_DOUBLE_RND_CONST / 1e9,
        SYS_DOUBLE_RND_CONST / 1e10,
        SYS_DOUBLE_RND_CONST / 1e11,
        SYS_DOUBLE_RND_CONST / 1e12,
        SYS_DOUBLE_RND_CONST / 1e13,
        SYS_DOUBLE_RND_CONST / 1e14,
        SYS_DOUBLE_RND_CONST / 1e15,
        SYS_DOUBLE_RND_CONST / 1e16,
        SYS_DOUBLE_RND_CONST / 1e17,
        SYS_DOUBLE_RND_CONST / 1e18
    };

    Uint64 mantissa, int_part, frac_part;
    int exp;
    int fbits;
    int max;
    int neg;
    double fr;
    union { Uint64 L; double F; } x;
    char *p = buffer;

    if (decimals < 0)
        return -1;

    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 |= ((Uint64)1 << 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);
        frac_part = 0;
        fbits = FRAC_SIZE;  /* not important as frac_part==0 */
    } else if (exp >= 0) {
        fbits = FRAC_SIZE - exp;
        int_part  = mantissa >> fbits;
        frac_part = mantissa & (((Uint64)1 << fbits) -1);
    } else /* if (exp < 0) */ {
        int_part = 0;
        frac_part = mantissa;
        fbits = FRAC_SIZE - exp;
    }

    if (!int_part) {
        if (neg)
            *p++ = '-';
        *p++ = '0';
    } else {
        int ret, i, n;
        while (int_part != 0) {
            *p++ = (char)((int_part % 10) + '0');
            int_part /= 10;
        }
        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++) {
            if (frac_part > (ERTS_UINT64_MAX/5)) {
                frac_part >>= 3;
                fbits -= 3;
            }

            /* Multiply by 10 (5*2) to extract decimal digit as integer part */
            frac_part *= 5;
            fbits--;

            if (fbits >= 64) {
                *p++ = '0';
            }
            else {
                *p++ = (char)((frac_part >> fbits) + '0');
                frac_part &= ((Uint64)1 << fbits) - 1;
            }
        }

        /* Delete trailing zeroes */
        if (compact)
            p = find_first_trailing_zero(p);
    }

    *p = '\0';
    return p - buffer;
}