libvips/libsrc/iofuncs/im_histlin.c

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2007-08-29 18:23:50 +02:00
/* @(#) Appends one line of history consisting of a buffer of data,
* @(#) time, history and CR in history section of the image descriptor
* @(#) The history variable list must be declared properly
* @(#) by the calling function
* @(#)
* @(#) int im_histlin(variable_list)
* @(#) (variable_list) is (imagedescriptor, format, arg1, arg2, ...)
* @(#) format, arg1, arg2, ... are the same as in printf
* @(#)
* @(#) Returns either 0 (success) or -1 (fail)
* @(#)
*
* Copyright: Nicos Dessipris
* Written on: 16/01/1990
* Modified on : 21/03/1991
* 28/10/92 JC
* - if Hist is NULL, no longer returns error code. Now makes a history
* line (just the file name) and continues
* - does not overwrite the end of strdup buffers any more!
* - bugs in calls to time/ctime fixed
* - no longer free's ctime's static buffer!
* - frees old Hist correctly
* 22/12/94
* - ANSIfied with stdarg
* 2/9/05
* - no more first line of Hist means something special nonsense
* 4/1/07
* - added im_history_get()
*/
/*
This file is part of VIPS.
VIPS 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 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 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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
/*
#define DEBUG
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <time.h>
#include <vips/vips.h>
#include <vips/internal.h>
#ifdef WITH_DMALLOC
#include <dmalloc.h>
#endif /*WITH_DMALLOC*/
int
im_histlin( IMAGE *im, const char *fmt, ... )
{
va_list args;
char line[4096];
time_t timebuf;
/* Format command. -40, to leave 26 for the ctime, three for the # and
* a bit.
*/
va_start( args, fmt );
(void) im_vsnprintf( line, 4096 - 40, fmt, args );
va_end( args );
strcat( line, " # " );
/* Add the date. ctime always attaches a '\n', gah.
*/
time( &timebuf );
strcat( line, ctime( &timebuf ) );
line[strlen( line ) - 1] = '\0';
#ifdef DEBUG
printf( "im_histlin: adding:\n\t%s\nto history on image %p\n",
line, im );
#endif /*DEBUG*/
im->history_list = g_slist_append( im->history_list,
im__gvalue_ref_string_new( line ) );
return( 0 );
}
/* Read an image's history.
*/
const char *
im_history_get( IMAGE *im )
{
if( !im->Hist )
im->Hist = im__gslist_gvalue_get( im->history_list );
return( im->Hist ? im->Hist : "" );
}