From 4bf7873b3b5e7cce19fe3aa52ad7476658efa885 Mon Sep 17 00:00:00 2001
From: hpa <hpa>
Date: Mon, 18 Feb 2002 23:43:43 +0000
Subject: Actually make the -o option work properly.

---
 syslinux.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/syslinux.c b/syslinux.c
index fb82fc54..8728a31c 100644
--- a/syslinux.c
+++ b/syslinux.c
@@ -101,7 +101,7 @@ static u_int32_t get_32(unsigned char *p)
 
 void usage(void)
 {
-  fprintf(stderr, "Usage: %s [-sf] device\n", program);
+  fprintf(stderr, "Usage: %s [-sf] [-o offset] device\n", program);
   exit(1);
 }
 
@@ -139,7 +139,7 @@ int main(int argc, char *argv[])
 	} else if ( *opt == 'f' ) {
 	  force = 1;		/* Force install */
 	} else if ( *opt == 'o' && argp[1] ) {
-	  offset = atol(*++argp); /* Byte offset */
+	  offset = strtoul(*++argp, NULL, 0); /* Byte offset */
 	} else {
 	  usage();
 	}
@@ -421,6 +421,13 @@ umount:
     exit(1);
   }
 
+  if ( lseek(dev_fd, offset, SEEK_SET) != offset ) {
+    if ( !(force && errno == EBADF) ) {
+      fprintf(stderr, "%s: seek error", device);
+      exit(1);
+    }
+  }
+
   /* Copy the old superblock into the new boot sector */
   memcpy(bootsect+bsCopyStart, sectbuf+bsCopyStart, bsCopyLen);
   
-- 
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