diff options
author | Dariusz Michaluk <d.michaluk@samsung.com> | 2024-02-13 15:44:51 +0100 |
---|---|---|
committer | Dariusz Michaluk <d.michaluk@samsung.com> | 2024-02-14 10:46:44 +0100 |
commit | c28e9eeaa4dccef63b3b237ebe8a8b5abb23e335 (patch) | |
tree | 504a1953b56446487f4759d3a5f348bbeb925461 /src/gl/lseek.c | |
parent | 1778d37a3eec1209d7c9c064318f3ff8c5132490 (diff) | |
parent | 031996ef501f8c3d0532f7df1c38cf2e540a4f11 (diff) | |
download | libtasn1-accepted/tizen_unified.tar.gz libtasn1-accepted/tizen_unified.tar.bz2 libtasn1-accepted/tizen_unified.zip |
Upgrade to libtasn1 4.19.0HEADaccepted/tizen/unified/20240214.164006tizenaccepted/tizen_unified
Change-Id: I893fd2c90c487d6e13b0b10e25b2cafc408da180
Diffstat (limited to 'src/gl/lseek.c')
-rw-r--r-- | src/gl/lseek.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/src/gl/lseek.c b/src/gl/lseek.c new file mode 100644 index 0000000..1a9c49b --- /dev/null +++ b/src/gl/lseek.c @@ -0,0 +1,89 @@ +/* An lseek() function that detects pipes. + Copyright (C) 2007, 2009-2022 Free Software Foundation, Inc. + + This file 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. + + This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */ + +#include <config.h> + +/* Specification. */ +#include <unistd.h> + +#if defined _WIN32 && ! defined __CYGWIN__ +/* Windows platforms. */ +/* Get GetFileType. */ +# include <windows.h> +/* Get _get_osfhandle. */ +# if GNULIB_MSVC_NOTHROW +# include "msvc-nothrow.h" +# else +# include <io.h> +# endif +#else +# include <sys/stat.h> +#endif +#include <errno.h> + +#undef lseek + +off_t +rpl_lseek (int fd, off_t offset, int whence) +{ +#if defined _WIN32 && ! defined __CYGWIN__ + /* mingw lseek mistakenly succeeds on pipes, sockets, and terminals. */ + HANDLE h = (HANDLE) _get_osfhandle (fd); + if (h == INVALID_HANDLE_VALUE) + { + errno = EBADF; + return -1; + } + if (GetFileType (h) != FILE_TYPE_DISK) + { + errno = ESPIPE; + return -1; + } +#elif defined __APPLE__ && defined __MACH__ && defined SEEK_DATA + if (whence == SEEK_DATA) + { + /* If OFFSET points to data, macOS lseek+SEEK_DATA returns the + start S of the first data region that begins *after* OFFSET, + where the region from OFFSET to S consists of possibly-empty + data followed by a possibly-empty hole. To work around this + portability glitch, check whether OFFSET is within data by + using lseek+SEEK_HOLE, and if so return to OFFSET by using + lseek+SEEK_SET. Also, contrary to the macOS documentation, + lseek+SEEK_HOLE can fail with ENXIO if there are no holes on + or after OFFSET. What a mess! */ + off_t next_hole = lseek (fd, offset, SEEK_HOLE); + if (next_hole < 0) + return errno == ENXIO ? offset : next_hole; + if (next_hole != offset) + whence = SEEK_SET; + } +#else + /* BeOS lseek mistakenly succeeds on pipes... */ + struct stat statbuf; + if (fstat (fd, &statbuf) < 0) + return -1; + if (!S_ISREG (statbuf.st_mode)) + { + errno = ESPIPE; + return -1; + } +#endif +#if _GL_WINDOWS_64_BIT_OFF_T || (defined __MINGW32__ && defined _FILE_OFFSET_BITS && (_FILE_OFFSET_BITS == 64)) + return _lseeki64 (fd, offset, whence); +#else + return lseek (fd, offset, whence); +#endif +} |