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Diffstat (limited to 'Build/source/texk/kpathsea/access.c')
-rw-r--r-- | Build/source/texk/kpathsea/access.c | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/Build/source/texk/kpathsea/access.c b/Build/source/texk/kpathsea/access.c new file mode 100644 index 00000000000..5e53d2965bf --- /dev/null +++ b/Build/source/texk/kpathsea/access.c @@ -0,0 +1,95 @@ +/* access -- test for access permissions of a file. + + Copyright 2008, 2009-2019 Karl Berry. + Copyright 1997-2001, 2005 Olaf Weber. + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this software; if not, see <http://www.gnu.org/licenses/>. */ + +#include <kpathsea/config.h> +#include <kpathsea/c-unistd.h> +#include <kpathsea/c-memstr.h> + +/* + * access mode x + * Returns 0 is x exists and can be accessed in accordance with mode. + * We use this rather than test because test looks at the permissions + * only, which doesn't take read-only file systems into account. + */ + +int +main (int argc, char **argv) +{ + int mode; + int status; + char * i; + + if (argc > 1 && strcmp (argv[1], "--help") == 0) { + printf("Usage: %s -MODE FILE\n\ + MODE is one or more of rwx. Exit successfully if FILE exists and is\n\ + readable (r), writable (w), or executable (x).\n\ +\n\ +--help display this help and exit\n\ +--version output version information and exit\n\n", argv[0]); + fputs ("Email bug reports to tex-k@tug.org.\n", stdout); + exit(0); + } else if (argc > 1 && strcmp (argv[1], "--version") == 0) { + printf ("%s (%s)\n\ +Copyright (C) 2009 Olaf Weber & Karl Berry.\n\ +There is NO warranty. You may redistribute this software\n\ +under the terms of the GNU General Public License\n\ +For more information about these matters, see the file named COPYING.\n\ +Primary author of %s: Olaf Weber.\n", +argv[0], KPSEVERSION, argv[0]); + exit (0); + } + + /* insist on exactly two args */ + if (argc != 3) { + fprintf(stderr, "%s: Need exactly two arguments.\n\ +Try `%s --help' for more information.\n", argv[0], argv[0]); + exit(1); + } + + /* The option parsing is somewhat primitive. The mode must be + * specified as a single parameter: an optional '-' followed by + * zero or more letters 'r', 'w', or 'x'. This may change. + */ + mode = 0; + i = argv[1]; + for (i = argv[1]; *i; ++i) + switch (*i) { + case 'r': mode |= R_OK; break; + case 'w': mode |= W_OK; break; +#if defined(_WIN32) +/* access() crashes for unsupported test of x bit */ + case 'x': break; +#else + case 'x': mode |= X_OK; break; +#endif + case '-': if (i == argv[1]) break; + default: + fprintf(stderr, "%s: Invalid MODE.\n", argv[0]); + exit(1); + } + + status = access(argv[2], mode); + + /* fail if the access call failed */ + if (status != 0) { + return 1; + } + + /* otherwise, succeed */ + return 0; +} |