mirror of https://git.ffmpeg.org/ffmpeg.git
95 lines
2.7 KiB
C
95 lines
2.7 KiB
C
|
/*
|
||
|
|
* C99-compatible strtod() implementation
|
||
|
|
* Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
|
||
|
|
*
|
||
|
|
* This file is part of Libav.
|
||
|
|
*
|
||
|
|
* Libav 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.
|
||
|
|
*
|
||
|
|
* Libav 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 Libav; if not, write to the Free Software
|
||
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <ctype.h>
|
||
|
|
#include <limits.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
|
||
|
|
#include "libavutil/avstring.h"
|
||
|
|
#include "libavutil/mathematics.h"
|
||
|
|
|
||
|
|
static char *check_nan_suffix(char *s)
|
||
|
|
{
|
||
|
|
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)
|
||
|
|
{
|
||
|
|
char *end;
|
||
|
|
double res;
|
||
|
|
|
||
|
|
/* Skip leading spaces */
|
||
|
|
while (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, &end, 16);
|
||
|
|
} else {
|
||
|
|
res = strtod(nptr, &end);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (endptr)
|
||
|
|
*endptr = end;
|
||
|
|
|
||
|
|
return res;
|
||
|
|
}
|