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/* im_system(): run a command on an image
*
* 7/3/00 JC
* - hacked it in
* 21/10/02 JC
* - use mktemp() if mkstemp() is not available
* 10/3/03 JC
* - out can be NULL
* 23/12/04
* - use g_mkstemp()
* 8/9/09
* - add .v suffix (thanks Roland)
* - use vipsbuf
* - rewrite to make it simpler
* 2/2/10
* - gtkdoc
*/
/*
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
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <vips/intl.h>
#include <stdio.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /*HAVE_UNISTD_H*/
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <vips/vips.h>
#define IM_MAX_STRSIZE (4096)
/**
* im_system:
* @im: image to run command on
* @cmd: command to run
* @out: stdout of command is returned here
*
* im_system() runs a command on an image, returning the command's output as a
* string. The command is executed with popen(), the first '%%s' in the
* command being substituted for a filename.
*
* If the IMAGE is a file on disc, then the filename will be the name of the
* real file. If the image is in memory, or the result of a computation,
* then a new file is created in the temporary area called something like
* "vips_XXXXXX.v", and that filename given to the command. The file is
* deleted when the command finishes.
*
* See im_system_image() for details on how VIPS selects a temporary
* directory.
*
* In all cases, @log must be freed with im_free().
*
* See also: im_system_image().
*
* Returns: 0 on success, -1 on error
*/
int
im_system( IMAGE *im, const char *cmd, char **out )
{
FILE *fp;
if( !im_isfile( im ) ) {
IMAGE *disc;
if( !(disc = im__open_temp( "%s.v" )) )
return( -1 );
if( im_copy( im, disc ) ||
im_system( disc, cmd, out ) ) {
im_close( disc );
return( -1 );
}
im_close( disc );
}
else if( (fp = im_popenf( cmd, "r", im->filename )) ) {
char line[IM_MAX_STRSIZE];
char txt[IM_MAX_STRSIZE];
VipsBuf buf = VIPS_BUF_STATIC( txt );
while( fgets( line, IM_MAX_STRSIZE, fp ) )
if( !vips_buf_appends( &buf, line ) )
break;
pclose( fp );
if( out )
*out = im_strdup( NULL, vips_buf_all( &buf ) );
}
return( 0 );
}
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