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e02cabec | 1 | /* Convert string for NaN payload to corresponding NaN. |
581c785b | 2 | Copyright (C) 1997-2022 Free Software Foundation, Inc. |
e02cabec JM |
3 | This file is part of the GNU C Library. |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
16 | License along with the GNU C Library; if not, see | |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
e02cabec JM |
18 | |
19 | #include <ieee754.h> | |
20 | #include <locale.h> | |
21 | #include <math.h> | |
22 | #include <stdlib.h> | |
23 | #include <wchar.h> | |
24 | ||
25 | ||
26 | /* If STR starts with an optional n-char-sequence as defined by ISO C | |
27 | (a sequence of ASCII letters, digits and underscores), followed by | |
28 | ENDC, return a NaN whose payload is set based on STR. Otherwise, | |
29 | return a default NAN. If ENDPTR is not NULL, set *ENDPTR to point | |
30 | to the character after the initial n-char-sequence. */ | |
31 | ||
e02cabec JM |
32 | FLOAT |
33 | STRTOD_NAN (const STRING_TYPE *str, STRING_TYPE **endptr, STRING_TYPE endc) | |
34 | { | |
35 | const STRING_TYPE *cp = str; | |
36 | ||
37 | while ((*cp >= L_('0') && *cp <= L_('9')) | |
38 | || (*cp >= L_('A') && *cp <= L_('Z')) | |
39 | || (*cp >= L_('a') && *cp <= L_('z')) | |
40 | || *cp == L_('_')) | |
41 | ++cp; | |
42 | ||
43 | FLOAT retval = NAN; | |
44 | if (*cp != endc) | |
45 | goto out; | |
46 | ||
47 | /* This is a system-dependent way to specify the bitmask used for | |
48 | the NaN. We expect it to be a number which is put in the | |
49 | mantissa of the number. */ | |
50 | STRING_TYPE *endp; | |
51 | unsigned long long int mant; | |
52 | ||
53 | mant = STRTOULL (str, &endp, 0); | |
54 | if (endp == cp) | |
9761bf4d | 55 | SET_NAN_PAYLOAD (retval, mant); |
e02cabec JM |
56 | |
57 | out: | |
58 | if (endptr != NULL) | |
59 | *endptr = (STRING_TYPE *) cp; | |
60 | return retval; | |
61 | } | |
62 | libc_hidden_def (STRTOD_NAN) |