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92 lines
2.7 KiB
92 lines
2.7 KiB
/* |
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* C99-compatible strtod() implementation |
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* Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include <ctype.h> |
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#include <limits.h> |
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#include "libavutil/avstring.h" |
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#include "libavutil/mathematics.h" |
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#include "strtod.h" |
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static char *check_nan_suffix(char *s) |
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{ |
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char *start = s; |
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if (*s++ != '(') |
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return start; |
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while ((*s >= 'a' && *s <= 'z') || (*s >= 'A' && *s <= 'Z') || |
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(*s >= '0' && *s <= '9') || *s == '_') |
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s++; |
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return *s == ')' ? s + 1 : start; |
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} |
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#undef strtod |
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double avpriv_strtod(char *restrict nptr, char **restrict endptr) |
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{ |
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char *end; |
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double res; |
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/* Skip leading spaces */ |
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while (isspace(*nptr)) |
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nptr++; |
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if (!av_strncasecmp(nptr, "infinity", 8)) { |
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end = nptr + 8; |
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res = INFINITY; |
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} else if (!av_strncasecmp(nptr, "inf", 3)) { |
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end = nptr + 3; |
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res = INFINITY; |
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} else if (!av_strncasecmp(nptr, "+infinity", 9)) { |
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end = nptr + 9; |
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res = INFINITY; |
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} else if (!av_strncasecmp(nptr, "+inf", 4)) { |
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end = nptr + 4; |
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res = INFINITY; |
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} else if (!av_strncasecmp(nptr, "-infinity", 9)) { |
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end = nptr + 9; |
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res = -INFINITY; |
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} else if (!av_strncasecmp(nptr, "-inf", 4)) { |
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end = nptr + 4; |
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res = -INFINITY; |
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} else if (!av_strncasecmp(nptr, "nan", 3)) { |
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end = check_nan_suffix(nptr + 3); |
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res = NAN; |
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} else if (!av_strncasecmp(nptr, "+nan", 4) || |
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!av_strncasecmp(nptr, "-nan", 4)) { |
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end = check_nan_suffix(nptr + 4); |
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res = NAN; |
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} else if (!av_strncasecmp(nptr, "0x", 2) || |
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!av_strncasecmp(nptr, "-0x", 3) || |
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!av_strncasecmp(nptr, "+0x", 3)) { |
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/* FIXME this doesn't handle exponents, non-integers (float/double) |
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* and numbers too large for long long */ |
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res = strtoll(nptr, &end, 16); |
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} else { |
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res = strtod(nptr, &end); |
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} |
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if (endptr) |
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*endptr = end; |
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return res; |
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}
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