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author | Ronald S. Bultje <rsbultje@gmail.com> | 2012-09-04 14:30:37 +0100 |
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committer | Martin Storsjö <martin@martin.st> | 2012-09-05 17:07:30 +0300 |
commit | 4fa661a857f16d4afd322920442b075c2a84ec4c (patch) | |
tree | b3103384656707ecb3d8b2cfaa4a28ce8e065fe7 /compat | |
parent | 0db2d94280e260af5f3ad7993c5a6357462f17c9 (diff) | |
download | ffmpeg-4fa661a857f16d4afd322920442b075c2a84ec4c.tar.gz |
lavu: add snprintf(), vsnprint() and strtod() replacements for MS runtime.
Signed-off-by: Martin Storsjö <martin@martin.st>
Diffstat (limited to 'compat')
-rw-r--r-- | compat/msvcrt/snprintf.c | 63 | ||||
-rw-r--r-- | compat/strtod.c | 94 |
2 files changed, 157 insertions, 0 deletions
diff --git a/compat/msvcrt/snprintf.c b/compat/msvcrt/snprintf.c new file mode 100644 index 0000000000..2cdec74b39 --- /dev/null +++ b/compat/msvcrt/snprintf.c @@ -0,0 +1,63 @@ +/* + * C99-compatible snprintf() and vsnprintf() implementations + * 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 <stdio.h> +#include <stdarg.h> +#include <limits.h> +#include <string.h> + +#include "libavutil/error.h" + +int avpriv_snprintf(char *s, size_t n, const char *fmt, ...) +{ + va_list ap; + int ret; + + va_start(ap, fmt); + ret = avpriv_vsnprintf(s, n, fmt, ap); + va_end(ap); + + return ret; +} + +int avpriv_vsnprintf(char *s, size_t n, const char *fmt, + va_list ap) +{ + int ret; + + if (n == 0) + return 0; + else if (n > INT_MAX) + return AVERROR(EOVERFLOW); + + /* we use n - 1 here because if the buffer is not big enough, the MS + * runtime libraries don't add a terminating zero at the end. MSDN + * recommends to provide _snprintf/_vsnprintf() a buffer size that + * is one less than the actual buffer, and zero it before calling + * _snprintf/_vsnprintf() to workaround this problem. + * See http://msdn.microsoft.com/en-us/library/1kt27hek(v=vs.80).aspx */ + memset(s, 0, n); + ret = _vsnprintf(s, n - 1, fmt, ap); + if (ret == -1) + ret = n; + + return ret; +} diff --git a/compat/strtod.c b/compat/strtod.c new file mode 100644 index 0000000000..7e979e8be6 --- /dev/null +++ b/compat/strtod.c @@ -0,0 +1,94 @@ +/* + * 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; +} |