dos33: add utility for manipulating raw sectors

dos33fs-utils/Makefile

@@ -1,6 +1,7 @@
 include ../Makefile.inc
 
 all:	dos33 mkdos33fs make_b \
+	dos33_raw \
 	dos33_text2ascii char2hex
 
 
@@ -10,12 +11,24 @@ char2hex:		char2hex.o
 char2hex.o:		char2hex.c
 			$(CC) $(CFLAGS) -c char2hex.c
 
+###
+
 dos33:			dos33.o
 			$(CC) $(LFLAGS) -o dos33 dos33.o
 
 dos33.o:		dos33.c dos33.h
 			$(CC) $(CFLAGS) -g -c dos33.c
 
+###
+
+dos33_raw:		dos33_raw.o
+			$(CC) $(LFLAGS) -o dos33_raw dos33_raw.o
+
+dos33_raw.o:		dos33_raw.c
+			$(CC) $(CFLAGS) -g -c dos33_raw.c
+
+###
+
 dos33_text2ascii:	dos33_text2ascii.o
 			$(CC) $(LFLGAS) -o dos33_text2ascii dos33_text2ascii.o
 
@@ -36,8 +49,8 @@ mkdos33fs.o:		mkdos33fs.c dos33.h
 
 
 install:	
-		cp dos33 mkdos33fs make_b dos33_text2ascii char2hex $(INSTALL_LOC)
+		cp dos33 dos33_raw mkdos33fs make_b dos33_text2ascii char2hex $(INSTALL_LOC)
 
 clean:		
-		rm -f *~ *.o dos33 mkdos33fs make_b dos33_text2ascii char2hex
+		rm -f *~ *.o dos33 dos33_raw mkdos33fs make_b dos33_text2ascii char2hex
 		cd tests && make clean

dos33fs-utils/dos33_raw.c

@@ -0,0 +1,75 @@
+#include <stdio.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <string.h>
+#include <unistd.h>
+
+/* usage: dos33_raw track sector file */
+static void usage(char *exe_name) {
+	printf("Usage:\n");
+	printf("\t%s disk_image track sector file\n\n",exe_name);
+	exit(1);
+}
+
+
+int main(int argc, char **argv) {
+
+	unsigned int track,sector;
+	int disk_image_fd;
+	int file_fd;
+	unsigned char buffer[256];
+	int result;
+
+	if (argc<4) {
+		usage(argv[0]);
+	}
+
+	track=atoi(argv[2]);
+	sector=atoi(argv[3]);
+
+	if (track>34) {
+		fprintf(stderr,"Warning!  Unusual track number %d\n",track);
+	}
+
+	if (track>15) {
+		fprintf(stderr,"Warning!  Unusual sector number %d\n",sector);
+	}
+
+	disk_image_fd=open(argv[1],O_RDWR);
+	if (disk_image_fd<0) {
+		fprintf(stderr,"Error opening %s: %s\n",
+			argv[1],strerror(errno));
+		exit(1);
+	}
+
+	file_fd=open(argv[4],O_RDONLY);
+	if (file_fd<0) {
+		fprintf(stderr,"Error opening %s: %s\n",
+			argv[4],strerror(errno));
+		exit(1);
+	}
+
+	result=lseek(disk_image_fd,(sector*256)+(track*16*256),SEEK_SET);
+	if (result<0) {
+		fprintf(stderr,"Error seeking: %s\n",strerror(errno));
+		exit(1);
+	}
+
+	/* write until out of space */
+	while(1) {
+		result=read(file_fd,buffer,256);
+		if (result<0) break;
+		result=write(disk_image_fd,buffer,result);
+		if (result<0) {
+			fprintf(stderr,"Error writing image: %s\n",
+				strerror(errno));
+			break;
+		}
+	}
+
+	close(file_fd);
+	close(disk_image_fd);
+
+	return 0;
+}