update name of code to labcodes

labcodes/lab6/tools/sign.c

@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <sys/stat.h>
+
+int
+main(int argc, char *argv[]) {
+    struct stat st;
+    if (argc != 3) {
+        fprintf(stderr, "Usage: <input filename> <output filename>\n");
+        return -1;
+    }
+    if (stat(argv[1], &st) != 0) {
+        fprintf(stderr, "Error opening file '%s': %s\n", argv[1], strerror(errno));
+        return -1;
+    }
+    printf("'%s' size: %lld bytes\n", argv[1], (long long)st.st_size);
+    if (st.st_size > 510) {
+        fprintf(stderr, "%lld >> 510!!\n", (long long)st.st_size);
+        return -1;
+    }
+    char buf[512];
+    memset(buf, 0, sizeof(buf));
+    FILE *ifp = fopen(argv[1], "rb");
+    int size = fread(buf, 1, st.st_size, ifp);
+    if (size != st.st_size) {
+        fprintf(stderr, "read '%s' error, size is %d.\n", argv[1], size);
+        return -1;
+    }
+    fclose(ifp);
+    buf[510] = 0x55;
+    buf[511] = 0xAA;
+    FILE *ofp = fopen(argv[2], "wb+");
+    size = fwrite(buf, 1, 512, ofp);
+    if (size != 512) {
+        fprintf(stderr, "write '%s' error, size is %d.\n", argv[2], size);
+        return -1;
+    }
+    fclose(ofp);
+    printf("build 512 bytes boot sector: '%s' success!\n", argv[2]);
+    return 0;
+}
+