123 lines
3.0 KiB
C
123 lines
3.0 KiB
C
/* im_system(): run a command on an image
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*
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* 7/3/00 JC
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* - hacked it in
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* 21/10/02 JC
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* - use mktemp() if mkstemp() is not available
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* 10/3/03 JC
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* - out can be NULL
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* 23/12/04
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* - use g_mkstemp()
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* 8/9/09
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* - add .v suffix (thanks Roland)
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* - use vipsbuf
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* - rewrite to make it simpler
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* 2/2/10
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* - gtkdoc
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) 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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <vips/intl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif /*HAVE_UNISTD_H*/
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#include <stdarg.h>
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#include <string.h>
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#include <errno.h>
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#include <vips/vips.h>
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#define IM_MAX_STRSIZE (4096)
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/**
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* im_system:
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* @im: image to run command on
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* @cmd: command to run
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* @out: stdout of command is returned here
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*
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* im_system() runs a command on an image, returning the command's output as a
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* string. The command is executed with popen(), the first '%%s' in the
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* command being substituted for a filename.
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*
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* If the IMAGE is a file on disc, then the filename will be the name of the
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* real file. If the image is in memory, or the result of a computation,
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* then a new file is created in the temporary area called something like
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* "vips_XXXXXX.v", and that filename given to the command. The file is
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* deleted when the command finishes.
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*
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* See im_system_image() for details on how VIPS selects a temporary
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* directory.
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*
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* In all cases, @log must be freed with im_free().
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*
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* See also: im_system_image().
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*
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* Returns: 0 on success, -1 on error
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*/
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int
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im_system( IMAGE *im, const char *cmd, char **out )
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{
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FILE *fp;
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if( !im_isfile( im ) ) {
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IMAGE *disc;
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if( !(disc = im__open_temp( "%s.v" )) )
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return( -1 );
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if( im_copy( im, disc ) ||
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im_system( disc, cmd, out ) ) {
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im_close( disc );
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return( -1 );
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}
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im_close( disc );
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}
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else if( (fp = im_popenf( cmd, "r", im->filename )) ) {
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char line[IM_MAX_STRSIZE];
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char txt[IM_MAX_STRSIZE];
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VipsBuf buf = VIPS_BUF_STATIC( txt );
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while( fgets( line, IM_MAX_STRSIZE, fp ) )
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if( !vips_buf_appends( &buf, line ) )
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break;
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pclose( fp );
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if( out )
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*out = im_strdup( NULL, vips_buf_all( &buf ) );
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}
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return( 0 );
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}
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