139 lines
3.1 KiB
C
139 lines
3.1 KiB
C
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/*******************************************************************************/
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/* Copyright (C) 2008 Jonathan Moore Liles */
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/* */
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/* This program is free software; you can redistribute it and/or modify it */
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/* under the terms of the GNU General Public License as published by the */
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/* Free Software Foundation; either version 2 of the License, or (at your */
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/* option) any later version. */
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/* */
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/* This program is distributed in the hope that it will be useful, but WITHOUT */
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/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
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/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for */
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/* more details. */
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/* */
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/* You should have received a copy of the GNU General Public License along */
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/* with This program; see the file COPYING. If not,write to the Free Software */
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/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/*******************************************************************************/
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#include <fcntl.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <stdio.h>
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unsigned long
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mtime ( const char *file )
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{
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struct stat st;
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if ( stat( file, &st ) )
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return 0;
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return st.st_mtime;
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}
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/** returns /true/ if /file1/ is newer than /file2/ (or file2 doesn't exist) */
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bool
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newer ( const char *file1, const char *file2 )
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{
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return mtime( file1 ) > mtime( file2 );
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}
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unsigned long
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size ( const char *file )
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{
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struct stat st;
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if ( stat( file, &st ) )
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return 0;
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return st.st_size;
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}
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int
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exists ( const char *name )
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{
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struct stat st;
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return 0 == stat( name, &st );
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}
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bool
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acquire_lock ( int *lockfd, const char *filename )
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{
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struct flock fl;
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fl.l_type = F_WRLCK;
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fl.l_whence = SEEK_SET;
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fl.l_start = 0;
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fl.l_len = 0;
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*lockfd = ::creat( filename, 0777 );
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if ( fcntl( *lockfd, F_SETLK, &fl ) != 0 )
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return false;
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return true;
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}
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void
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release_lock ( int *lockfd, const char *filename )
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{
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unlink( filename );
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::close( *lockfd );
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*lockfd = 0;
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}
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int
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backwards_fgetc ( FILE *fp )
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{
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int c;
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if ( fseek( fp, -1, SEEK_CUR ) != 0 )
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return -1;
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c = fgetc( fp );
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fseek( fp, -1, SEEK_CUR );
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return c;
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}
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char *
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backwards_fgets ( char *s, int size, FILE *fp )
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{
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if ( fseek( fp, -1, SEEK_CUR ) != 0 )
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return NULL;
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int c;
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while ( ( c = backwards_fgetc( fp ) ) >= 0 )
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if ( '\n' == c )
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break;
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long here = ftell( fp );
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fseek( fp, 1, SEEK_CUR );
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char *r = fgets( s, size, fp );
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fseek( fp, here, SEEK_SET );
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return r;
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}
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/** update the modification time of file referred to by /fd/ */
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void
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touch ( int fd )
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{
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struct stat st;
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fstat( fd, &st );
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fchmod( fd, st.st_mode );
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}
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