/**
* im_copy_file:
* @in: input image
* @out: output image
*
* Copy an image to a disc file, then copy again to output. If the image is
* already a disc file, just copy straight through.
*
* The disc file is allocated in the same way as im_system_image().
* The file is automatically deleted when @out is closed.
*
* See also: im_copy(), im_system_image().
*
* Returns: 0 on success, -1 on error
*/
int
im_copy_file( IMAGE *in, IMAGE *out )
{
if( !im_isfile( in ) ) {
IMAGE *disc;
if( !(disc = im__open_temp( "%s.v" )) )
return( -1 );
if( im_add_close_callback( out,
(im_callback_fn) im_close, disc, NULL ) ) {
im_close( disc );
return( -1 );
}
if( im_copy( in, disc ) ||
im_copy( disc, out ) )
return( -1 );
}
else {
if( im_copy( in, out ) )
return( -1 );
}
return( 0 );
}
/**
* 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.
*
* The environment variable TMPDIR can be used to set the temporary
* directory. If it is not set, it defaults to "/tmp".
*
* 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 );
}