8

commit 9fe1ca723978ede2fb6785443ffa3a5a08dab310
parent 843bda1dd605a7dfbeab4349669945d6ae71d5ac
Author: Naveen Narayanan <nan@sysgo.com>
Date:   Sun,  6 Mar 2022 16:59:08 +0100

Read rom to buf

Diffstat:
M
8.c
 | 
28
++++++++++++++++++++++++++++

1 file changed, 28 insertions(+), 0 deletions(-)
diff --git a/8.c b/8.c
@@ -1,6 +1,13 @@
+#include <err.h>
+#include <fcntl.h>
 #include <limits.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include <sys/types.h>
+#include <sys/stat.h>
 
 #define BUFSZ 256
 
@@ -302,8 +309,29 @@ usage()
 int
 main(int argc, char **argv)
 {
+	struct stat st;
+	int fd, n, r;
+
 	if (argc < 2)
 		usage();
 
+	if (stat(argv[1], &st) != 0)
+		err(1, "stat failed");
+	if (st.st_size > BUFSZ) {
+		fprintf(stderr, "file too big\n");
+		return 1;
+	}
+
+	if ((fd = open(argv[1], O_RDONLY)) == -1)
+		err(1, "open failed");
+
+	r = 0;
+	while (r < st.st_size) {
+		if ((n = read(fd, buf, st.st_size-r)) == -1)
+			err(1, "read failed");
+		r += n;
+	}
+
+	init();
 	return 0;
 }