comparison stitch/io.c @ 0:5242703e91d3 tip

Initial checkin for AIM92 aimR8.2 (last updated May 1997).

+/*
+    Copyright (c) Applied Psychology Unit, Medical Research Council. 1988, 1989
+    ===========================================================================
+
+    Permission to use, copy, modify, and distribute this software without fee 
+    is hereby granted for research purposes, provided that this copyright 
+    notice appears in all copies and in all supporting documentation, and that 
+    the software is not redistributed for any fee (except for a nominal shipping 
+    charge). Anyone wanting to incorporate all or part of this software in a
+    commercial product must obtain a license from the Medical Research Council.
+
+    The MRC makes no representations about the suitability of this 
+    software for any purpose.  It is provided "as is" without express or implied 
+    warranty.
+ 
+    THE MRC DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING 
+    ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL THE
+    A.P.U. BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY 
+    DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN 
+    AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 
+    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+/*
+    io.c
+    ====
+
+    file i/o sources/sinks.
+
+
+*/
+
+#include <stdio.h>
+
+#include "stitch.h"
+#include "source.h"
+#include "io.h"
+
+extern int fclose() ;
+
+/* for IBM pc's */
+#ifdef PC
+char  readBinary[] = "rb" ;
+char writeBinary[] = "wb" ;
+#else
+char  readBinary[] = "r" ;
+char writeBinary[] = "w" ;
+#endif
+
+/* sources */
+
+static void read_callback( state, bytes, buffer, end )
+FILE *state ;
+ByteCount *bytes ;
+Pointer buffer ;
+{
+    int actuall ;
+
+    if( *bytes > 0 ) {
+	actuall = fread( (char *) buffer, sizeof ( char ), *bytes, state ) ;
+
+	if( actuall == EOF )
+	    actuall  =  0  ;
+
+	stitch_bzero( (char *)buffer+actuall, *bytes-actuall ) ;
+
+	*bytes = actuall ;
+    }
+    else if( *bytes < 0 )
+	(void) fseek( state, (long) -*bytes, 1 ) ;
+
+    return ;
+}
+
+Source FileSource( fp )
+FILE *fp ;
+{
+    if( fp == ( FILE * ) 0 )
+	(void) fprintf( stderr, "Bad file pointer FileSource - unable to open file?\n" ) ;
+
+    return ( NewExternalSource( (Pointer) fp, read_callback, (void ( * )()) 0, "io.c file pointer" ) ) ;
+}
+
+Source StdinSource()
+{
+    return ( FileSource( stdin ) ) ;
+}
+
+Source FileNameSource( name )
+char *name ;
+{
+    FILE *fp = fopen( name, readBinary ) ;
+
+    if( fp == (FILE *) 0 )
+	if( strcmp( name, "-" ) == 0 )
+	    return ( StdinSource() ) ;
+	else {
+	    (void) fprintf( stderr, "Bad file pointer FileSource - unable to open file?\n" ) ;
+	    return ( EmptySource ) ;
+	}
+
+    return ( NewExternalSource( (Pointer) fopen( name, readBinary ), read_callback, (void ( * )()) fclose, "io.c named file" ) ) ;
+}
+
+
+/* tap source into file on way past */
+
+static void write_callback( state, bytes, buffer, end )
+FILE *state ;
+ByteCount *bytes ;
+Pointer buffer ;
+{
+    if( *bytes > 0 )
+	(void) fwrite( (char *) buffer, sizeof ( char ), *bytes, state ) ;
+    else if( *bytes < 0 )
+	(void) fseek( state, (long) -*bytes, 1 ) ;
+
+    return ;
+}
+
+Source FileTap( source, fp )
+Source source ;
+FILE *fp ;
+{
+    if( fp == ( FILE * ) 0 )
+	(void) fprintf( stderr, "Bad file pointer FileTap - unable to open file?\n" ) ;
+
+    return ( NewTappingSource( (Pointer) fp, write_callback, (void (*)()) 0, source, "io.c file pointer tapping" ) ) ;
+}
+
+Source FileNameTap( source, name )
+Source source ;
+char *name ;
+{
+    (void) unlink( name ) ;
+
+    return ( NewTappingSource( (Pointer) fopen( name, writeBinary ), write_callback, (void ( * )()) fclose, source, "io.c named file tapping" ) ) ;
+}
+
+Source StdoutTap( source )
+Source source ;
+{
+    return ( FileTap( source, stdout ) ) ;
+}
+