From 723428bebe3105ad3c3406e416402d1831b482c4 Mon Sep 17 00:00:00 2001
From: Andrew Lee <alee14498@protonmail.com>
Date: Sun, 15 Aug 2021 00:16:45 -0400
Subject: Inital commit

---
 linux/tools/build.c | 68 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 68 insertions(+)
 create mode 100644 linux/tools/build.c

(limited to 'linux/tools')

diff --git a/linux/tools/build.c b/linux/tools/build.c
new file mode 100644
index 0000000..6afe58c
--- /dev/null
+++ b/linux/tools/build.c
@@ -0,0 +1,68 @@
+#include <stdio.h>	/* fprintf */
+#include <stdlib.h>	/* contains exit */
+#include <sys/types.h>	/* unistd.h needs this */
+#include <unistd.h>	/* contains read/write */
+#include <fcntl.h>
+
+#define MINIX_HEADER 32
+#define GCC_HEADER 1024
+
+void die(char * str)
+{
+	fprintf(stderr,"%s\n",str);
+	exit(1);
+}
+
+void usage(void)
+{
+	die("Usage: build boot system [> image]");
+}
+
+int main(int argc, char ** argv)
+{
+	int i,c,id;
+	char buf[1024];
+
+	if (argc != 3)
+		usage();
+	for (i=0;i<sizeof buf; i++) buf[i]=0;
+	if ((id=open(argv[1],O_RDONLY,0))<0)
+		die("Unable to open 'boot'");
+	if (read(id,buf,MINIX_HEADER) != MINIX_HEADER)
+		die("Unable to read header of 'boot'");
+	if (((long *) buf)[0]!=0x04100301)
+		die("Non-Minix header of 'boot'");
+	if (((long *) buf)[1]!=MINIX_HEADER)
+		die("Non-Minix header of 'boot'");
+	if (((long *) buf)[3]!=0)
+		die("Illegal data segment in 'boot'");
+	if (((long *) buf)[4]!=0)
+		die("Illegal bss in 'boot'");
+	if (((long *) buf)[5] != 0)
+		die("Non-Minix header of 'boot'");
+	if (((long *) buf)[7] != 0)
+		die("Illegal symbol table in 'boot'");
+	i=read(id,buf,sizeof buf);
+	fprintf(stderr,"Boot sector %d bytes.\n",i);
+	if (i>510)
+		die("Boot block may not exceed 510 bytes");
+	buf[510]=0x55;
+	buf[511]=0xAA;
+	i=write(1,buf,512);
+	if (i!=512)
+		die("Write call failed");
+	close (id);
+	
+	if ((id=open(argv[2],O_RDONLY,0))<0)
+		die("Unable to open 'system'");
+	if (read(id,buf,GCC_HEADER) != GCC_HEADER)
+		die("Unable to read header of 'system'");
+	if (((long *) buf)[5] != 0)
+		die("Non-GCC header of 'system'");
+	for (i=0 ; (c=read(id,buf,sizeof buf))>0 ; i+=c )
+		if (write(1,buf,c)!=c)
+			die("Write call failed");
+	close(id);
+	fprintf(stderr,"System %d bytes.\n",i);
+	return(0);
+}
-- 
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