2 * C99-compatible strtod() implementation
3 * Copyright (c) 2012 Ronald S. Bultje <rsbultje@gmail.com>
5 * This file is part of FFmpeg.
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.
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.
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
25 #include "libavutil/avstring.h"
26 #include "libavutil/mathematics.h"
29 static char *check_nan_suffix(char *s)
36 while ((*s >= 'a' && *s <= 'z') || (*s >= 'A' && *s <= 'Z') ||
37 (*s >= '0' && *s <= '9') || *s == '_')
40 return *s == ')' ? s + 1 : start;
44 double avpriv_strtod(char *restrict nptr, char **restrict endptr)
49 /* Skip leading spaces */
50 while (isspace(*nptr))
53 if (!av_strncasecmp(nptr, "infinity", 8)) {
56 } else if (!av_strncasecmp(nptr, "inf", 3)) {
59 } else if (!av_strncasecmp(nptr, "+infinity", 9)) {
62 } else if (!av_strncasecmp(nptr, "+inf", 4)) {
65 } else if (!av_strncasecmp(nptr, "-infinity", 9)) {
68 } else if (!av_strncasecmp(nptr, "-inf", 4)) {
71 } else if (!av_strncasecmp(nptr, "nan", 3)) {
72 end = check_nan_suffix(nptr + 3);
74 } else if (!av_strncasecmp(nptr, "+nan", 4) ||
75 !av_strncasecmp(nptr, "-nan", 4)) {
76 end = check_nan_suffix(nptr + 4);
78 } else if (!av_strncasecmp(nptr, "0x", 2) ||
79 !av_strncasecmp(nptr, "-0x", 3) ||
80 !av_strncasecmp(nptr, "+0x", 3)) {
81 /* FIXME this doesn't handle exponents, non-integers (float/double)
82 * and numbers too large for long long */
83 res = strtoll(nptr, &end, 16);
85 res = strtod(nptr, &end);