/* * 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 <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 (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, &end, 16); } else { res = strtod(nptr, &end); } if (endptr) *endptr = end; return res; }