From ba537202801d71711f1ef9306a6248dd2d426fa0 Mon Sep 17 00:00:00 2001 From: "Ronald S. Bultje" Date: Tue, 28 Aug 2012 07:41:16 -0700 Subject: lavu: add snprintf(), vsnprint() and strtod() replacements for MS runtime. Signed-off-by: Michael Niedermayer --- compat/snprintf.c | 64 +++++++++++++++++++++++++++++++++++++ compat/snprintf.h | 46 +++++++++++++++++++++++++++ compat/strtod.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ compat/strtod.h | 37 ++++++++++++++++++++++ configure | 26 +++++++++++++++ libavutil/Makefile | 3 ++ 6 files changed, 268 insertions(+) create mode 100644 compat/snprintf.c create mode 100644 compat/snprintf.h create mode 100644 compat/strtod.c create mode 100644 compat/strtod.h diff --git a/compat/snprintf.c b/compat/snprintf.c new file mode 100644 index 0000000000..c54c8e201b --- /dev/null +++ b/compat/snprintf.c @@ -0,0 +1,64 @@ +/* + * C99-compatible snprintf() and vsnprintf() implementations + * Copyright (c) 2012 Ronald S. Bultje + * + * 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 +#include + +#include "libavutil/error.h" +#include "snprintf.h" + +#undef snprintf +int avpriv_snprintf(char *restrict s, size_t n, const char *restrict fmt, ...) +{ + va_list ap; + int ret; + + va_start(ap, fmt); + ret = avpriv_vsnprintf(s, n, fmt, ap); + va_end(ap); + + return ret; +} + +#undef vsnprintf +int avpriv_vsnprintf(char *restrict s, size_t n, const char *restrict fmt, + va_list ap) +{ + int ret; + + if (n == 0) + return 0; + else if (n > INT_MAX) + return AVERROR(EINVAL); + + /* 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/snprintf.h b/compat/snprintf.h new file mode 100644 index 0000000000..60c198b7fc --- /dev/null +++ b/compat/snprintf.h @@ -0,0 +1,46 @@ +/* + * C99-compatible snprintf() and vsnprintf() implementations + * Copyright (c) 2012 Ronald S. Bultje + * + * 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 + */ + +#ifndef AVCOMPAT_SNPRINTF_H +#define AVCOMPAT_SNPRINTF_H + +#include +#include + +/* + * snprintf() on MSVCRT returns -1 (instead of required buffer length) + * if the input buffer isn't big enough. Also, if the required buffer + * length is exactly identical to the input buffer size, or if the + * return value is -1 because the input buffer isn't big enough, MSVCRT + * will fail to NULL-terminate the output buffer. vsnprintf() has the + * same issue. + * + * Thus, provide our own fallback wrappers with correct behaviour. + */ +#undef snprintf +#define snprintf avpriv_snprintf +int snprintf(char *restrict s, size_t n, const char *restrict format, ...); + +#undef vsnprintf +#define vsnprintf avpriv_vsnprintf +int vsnprintf(char *restrict s, size_t n, const char *restrict format, va_list ap); + +#endif /* AVCOMPAT_SNPRINTF_H */ diff --git a/compat/strtod.c b/compat/strtod.c new file mode 100644 index 0000000000..149d18aa92 --- /dev/null +++ b/compat/strtod.c @@ -0,0 +1,92 @@ +/* + * C99-compatible strtod() implementation + * Copyright (c) 2012 Ronald S. Bultje + * + * 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 +#include + +#include "libavutil/avstring.h" +#include "libavutil/mathematics.h" +#include "strtod.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 avpriv_strtod(char *restrict nptr, char **restrict 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; +} diff --git a/compat/strtod.h b/compat/strtod.h new file mode 100644 index 0000000000..985bf4d16c --- /dev/null +++ b/compat/strtod.h @@ -0,0 +1,37 @@ +/* + * C99-compatible strtod() implementation + * Copyright (c) 2012 Ronald S. Bultje + * + * 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 + */ + +#ifndef AVCOMPAT_STRTOD_H +#define AVCOMPAT_STRTOD_H + +#include + +/* + * strtod() on MSVCRT doesn't handle strings like 'inf' or 'nan'. Also, + * it doesn't handle "0x" prefixes for hexadecimal input. + * + * Thus, provide our own fallback wrapper with correct behaviour. + */ +#undef strtod +#define strtod avpriv_strtod +double strtod(char *restrict nptr, char **restrict endptr); + +#endif /* AVCOMPAT_STRTOD_H */ diff --git a/configure b/configure index 48e307c5f1..6c69429ce5 100755 --- a/configure +++ b/configure @@ -1043,6 +1043,11 @@ cp_if_changed(){ cp -f "$1" "$2" } +force_include(){ + flag=$(eval printf '%s%s\\n' '$FORCE_INC' $1) + append CFLAGS "$flag" +} + # CONFIG_LIST contains configurable options, while HAVE_LIST is for # system-dependent things. @@ -1240,6 +1245,7 @@ HAVE_LIST=" asm_types_h attribute_may_alias attribute_packed + broken_strtod cbrtf clock_gettime closesocket @@ -1326,6 +1332,7 @@ HAVE_LIST=" setrlimit Sleep sndio_h + snprintf socklen_t soundcard_h strerror_r @@ -2038,6 +2045,7 @@ CC_O='-o $@' CXX_C='-c' CXX_O='-o $@' LD_O='-o $@' +FORCE_INC="-include" HOSTCC_C='-c' HOSTCC_O='-o $@' @@ -3358,6 +3366,7 @@ check_func mmap check_func ${malloc_prefix}posix_memalign && enable posix_memalign check_func_headers malloc.h _aligned_malloc && enable aligned_malloc check_func setrlimit +check_func snprintf check_func strerror_r check_func strptime check_func sched_getaffinity @@ -3378,6 +3387,15 @@ check_func_headers windows.h Sleep check_func_headers windows.h VirtualAlloc check_func_headers glob.h glob +# Check for MSVCRT; it has a broken strtod() that can't parse some input. +# Use old dos symbol to detect it. If we are on mingw, it already provides +# its own replacement and we don't need to redo that. +if check_func _get_doserrno; then + if test $target_os != mingw32; then + enable broken_strtod + fi +fi + check_header dlfcn.h check_header dxva.h check_header dxva2api.h -D_WIN32_WINNT=0x0600 @@ -3749,6 +3767,14 @@ elif enabled pathscale; then add_cflags -fstrict-overflow -OPT:wrap_around_unsafe_opt=OFF fi +# If a missing snprintf/broken strtod is detected, force-include headers +# that override prototypes and define it to a prefixed one implemented in +# libavutil. We do this at the end since -I flags aren't set in configure, +# and any additional check_cflags() beyond here will thus fail (because +# it can't find these files, because the -I$(srcdir) wasn't set). +enabled snprintf || force_include compat/snprintf.h +enabled broken_strtod && force_include compat/strtod.h + enabled_any $THREADS_LIST && enable threads check_deps $CONFIG_LIST \ diff --git a/libavutil/Makefile b/libavutil/Makefile index ef1f658bb4..bd569ecb05 100644 --- a/libavutil/Makefile +++ b/libavutil/Makefile @@ -94,6 +94,9 @@ OBJS = adler32.o \ utils.o \ xtea.o \ +OBJS-$(!HAVE_SNPRINTF) += ../compat/snprintf.o +OBJS-$(HAVE_BROKEN_STRTOD) += ../compat/strtod.o + TESTPROGS = adler32 \ aes \ avstring \ -- cgit v1.2.3