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2ba45a60 DM |
1 | /* |
2 | * C99-compatible strtod() implementation | |
3 | * Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com> | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
7 | * FFmpeg is free software; you can redistribute it and/or | |
8 | * modify it under the terms of the GNU Lesser General Public | |
9 | * License as published by the Free Software Foundation; either | |
10 | * version 2.1 of the License, or (at your option) any later version. | |
11 | * | |
12 | * FFmpeg is distributed in the hope that it will be useful, | |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * Lesser General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU Lesser General Public | |
18 | * License along with FFmpeg; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | |
20 | */ | |
21 | ||
22 | #include <limits.h> | |
23 | #include <stdlib.h> | |
24 | ||
25 | #include "libavutil/avstring.h" | |
26 | #include "libavutil/mathematics.h" | |
27 | ||
28 | static char *check_nan_suffix(char *s) | |
29 | { | |
30 | char *start = s; | |
31 | ||
32 | if (*s++ != '(') | |
33 | return start; | |
34 | ||
35 | while ((*s >= 'a' && *s <= 'z') || (*s >= 'A' && *s <= 'Z') || | |
36 | (*s >= '0' && *s <= '9') || *s == '_') | |
37 | s++; | |
38 | ||
39 | return *s == ')' ? s + 1 : start; | |
40 | } | |
41 | ||
42 | #undef strtod | |
43 | double strtod(const char *, char **); | |
44 | ||
45 | double avpriv_strtod(const char *nptr, char **endptr) | |
46 | { | |
47 | char *end; | |
48 | double res; | |
49 | ||
50 | /* Skip leading spaces */ | |
51 | while (av_isspace(*nptr)) | |
52 | nptr++; | |
53 | ||
54 | if (!av_strncasecmp(nptr, "infinity", 8)) { | |
55 | end = nptr + 8; | |
56 | res = INFINITY; | |
57 | } else if (!av_strncasecmp(nptr, "inf", 3)) { | |
58 | end = nptr + 3; | |
59 | res = INFINITY; | |
60 | } else if (!av_strncasecmp(nptr, "+infinity", 9)) { | |
61 | end = nptr + 9; | |
62 | res = INFINITY; | |
63 | } else if (!av_strncasecmp(nptr, "+inf", 4)) { | |
64 | end = nptr + 4; | |
65 | res = INFINITY; | |
66 | } else if (!av_strncasecmp(nptr, "-infinity", 9)) { | |
67 | end = nptr + 9; | |
68 | res = -INFINITY; | |
69 | } else if (!av_strncasecmp(nptr, "-inf", 4)) { | |
70 | end = nptr + 4; | |
71 | res = -INFINITY; | |
72 | } else if (!av_strncasecmp(nptr, "nan", 3)) { | |
73 | end = check_nan_suffix(nptr + 3); | |
74 | res = NAN; | |
75 | } else if (!av_strncasecmp(nptr, "+nan", 4) || | |
76 | !av_strncasecmp(nptr, "-nan", 4)) { | |
77 | end = check_nan_suffix(nptr + 4); | |
78 | res = NAN; | |
79 | } else if (!av_strncasecmp(nptr, "0x", 2) || | |
80 | !av_strncasecmp(nptr, "-0x", 3) || | |
81 | !av_strncasecmp(nptr, "+0x", 3)) { | |
82 | /* FIXME this doesn't handle exponents, non-integers (float/double) | |
83 | * and numbers too large for long long */ | |
84 | res = strtoll(nptr, &end, 16); | |
85 | } else { | |
86 | res = strtod(nptr, &end); | |
87 | } | |
88 | ||
89 | if (endptr) | |
90 | *endptr = end; | |
91 | ||
92 | return res; | |
93 | } |