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71 lines
2.0 KiB
71 lines
2.0 KiB
/* readable.c: check if a filename is a readable regular file. |
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Copyright (C) 1993 Karl Berry. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2, or (at your option) |
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any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
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#include <kpathsea/config.h> |
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#include <kpathsea/c-stat.h> |
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#include <kpathsea/readable.h> |
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#include <kpathsea/truncate.h> |
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/* If access can read FN, run stat (assigning to stat buffer ST) and |
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check that fn is a regular file. */ |
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#define READABLE(fn, st) \ |
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(access (fn, R_OK) == 0 && stat (fn, &(st)) == 0 && S_ISREG (st.st_mode)) |
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/* POSIX invented the brain-damage of not necessarily truncating |
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filename components; the system's behavior is defined by the value of |
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the symbol _POSIX_NO_TRUNC, but you can't change it dynamically! |
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Generic const return warning. See extend-fname.c. */ |
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string |
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kpse_readable_file P1C(const_string, name) |
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{ |
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struct stat st; |
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string ret; |
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if (READABLE (name, st)) |
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ret = (string) name; |
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#ifdef ENAMETOOLONG |
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else if (errno == ENAMETOOLONG) |
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{ |
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ret = kpse_truncate_filename (name); |
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/* Perhaps some other error will occur with the truncated name, so |
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let's call access again. */ |
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if (!READABLE (ret, st)) |
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{ /* Failed. */ |
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if (ret != name) free (ret); |
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ret = NULL; |
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} |
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} |
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#endif |
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else /* Some other error. */ |
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{ |
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if (errno == EACCES) /* Warn them if permissions are bad. */ |
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perror (name); |
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ret = NULL; |
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} |
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return ret; |
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}
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