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