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Diffstat (limited to 'Build/source/texk/kpathsea/file-p.c')
-rw-r--r-- | Build/source/texk/kpathsea/file-p.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/Build/source/texk/kpathsea/file-p.c b/Build/source/texk/kpathsea/file-p.c new file mode 100644 index 00000000000..8e45a92097f --- /dev/null +++ b/Build/source/texk/kpathsea/file-p.c @@ -0,0 +1,75 @@ +/* file-p.c: file predicates. + + Copyright 1992, 1993, 1994, 2008, 2015, 2016 Karl Berry. + + This library 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 library 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 library; if not, see <http://www.gnu.org/licenses/>. */ + +#include <kpathsea/config.h> + +#include <kpathsea/xstat.h> + + +/* Test whether FILENAME1 and FILENAME2 are actually the same file. If + stat fails on either of the names, we return false, without error. */ + +boolean +same_file_p (const_string filename1, const_string filename2) +{ +#ifdef _WIN32 + intptr_t handle1, handle2; + FILE *f1, *f2; + BY_HANDLE_FILE_INFORMATION fileinfo1, fileinfo2; + + f1 = fopen(filename1, "r"); + if(!f1) return false; + f2 = fopen(filename2, "r"); + if(!f2) { + fclose(f1); + return false; + } + + handle1 = _get_osfhandle(fileno(f1)); + handle2 = _get_osfhandle(fileno(f2)); + + if (!GetFileInformationByHandle((HANDLE)handle1, &fileinfo1)) { + fclose(f1); + fclose(f2); + return false; + } + + if (!GetFileInformationByHandle((HANDLE)handle2, &fileinfo2)) { + fclose(f1); + fclose(f2); + return false; + } + + fclose(f1); + fclose(f2); + + if (fileinfo1.dwVolumeSerialNumber == fileinfo2.dwVolumeSerialNumber && + fileinfo1.nFileIndexHigh == fileinfo2.nFileIndexHigh && + fileinfo1.nFileIndexLow == fileinfo2.nFileIndexLow) + return true; + else + return false; +#else + struct stat sb1, sb2; + /* These are put in variables only so the results can be inspected + under gdb. */ + int r1 = stat (filename1, &sb1); + int r2 = stat (filename2, &sb2); + + return r1 == 0 && r2 == 0 ? SAME_FILE_P (sb1, sb2) : false; +#endif +} |