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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * C99-compatible strtod() implementation |
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| 3 | * Copyright (c) 2012 Ronald S. Bultje |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | #include |
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| 23 | #include |
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| 24 | |||
| 25 | #include "libavutil/avstring.h" |
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| 26 | #include "libavutil/mathematics.h" |
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| 27 | |||
| 28 | static char *check_nan_suffix(char *s) |
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| 29 | { |
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| 30 | char *start = s; |
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| 31 | |||
| 32 | if (*s++ != '(') |
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| 33 | return start; |
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| 34 | |||
| 35 | while ((*s >= 'a' && *s <= 'z') || (*s >= 'A' && *s <= 'Z') || |
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| 36 | (*s >= '0' && *s <= '9') || *s == '_') |
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| 37 | s++; |
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| 38 | |||
| 39 | return *s == ')' ? s + 1 : start; |
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| 40 | } |
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| 41 | |||
| 42 | #undef strtod |
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| 43 | double strtod(const char *, char **); |
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| 44 | |||
| 45 | double avpriv_strtod(const char *nptr, char **endptr) |
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| 46 | { |
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| 47 | char *end; |
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| 48 | double res; |
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| 49 | |||
| 50 | /* Skip leading spaces */ |
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| 51 | while (av_isspace(*nptr)) |
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| 52 | nptr++; |
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| 53 | |||
| 54 | if (!av_strncasecmp(nptr, "infinity", 8)) { |
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| 55 | end = nptr + 8; |
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| 56 | res = INFINITY; |
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| 57 | } else if (!av_strncasecmp(nptr, "inf", 3)) { |
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| 58 | end = nptr + 3; |
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| 59 | res = INFINITY; |
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| 60 | } else if (!av_strncasecmp(nptr, "+infinity", 9)) { |
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| 61 | end = nptr + 9; |
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| 62 | res = INFINITY; |
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| 63 | } else if (!av_strncasecmp(nptr, "+inf", 4)) { |
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| 64 | end = nptr + 4; |
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| 65 | res = INFINITY; |
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| 66 | } else if (!av_strncasecmp(nptr, "-infinity", 9)) { |
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| 67 | end = nptr + 9; |
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| 68 | res = -INFINITY; |
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| 69 | } else if (!av_strncasecmp(nptr, "-inf", 4)) { |
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| 70 | end = nptr + 4; |
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| 71 | res = -INFINITY; |
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| 72 | } else if (!av_strncasecmp(nptr, "nan", 3)) { |
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| 73 | end = check_nan_suffix(nptr + 3); |
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| 74 | res = NAN; |
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| 75 | } else if (!av_strncasecmp(nptr, "+nan", 4) || |
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| 76 | !av_strncasecmp(nptr, "-nan", 4)) { |
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| 77 | end = check_nan_suffix(nptr + 4); |
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| 78 | res = NAN; |
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| 79 | } else if (!av_strncasecmp(nptr, "0x", 2) || |
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| 80 | !av_strncasecmp(nptr, "-0x", 3) || |
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| 81 | !av_strncasecmp(nptr, "+0x", 3)) { |
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| 82 | /* FIXME this doesn't handle exponents, non-integers (float/double) |
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| 83 | * and numbers too large for long long */ |
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| 84 | res = strtoll(nptr, &end, 16); |
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| 85 | } else { |
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| 86 | res = strtod(nptr, &end); |
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| 87 | } |
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| 88 | |||
| 89 | if (endptr) |
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| 90 | *endptr = end; |
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| 91 | |||
| 92 | return res; |
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| 93 | } |