Add C version of qloader2-install script

qloader2-install.c

@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stddef.h>
+#include <inttypes.h>
+
+int main(int argc, char *argv[]) {
+    if (argc < 3) {
+        printf("Usage: %s <path to qloader2 binary> <device> [qloader2 start sector]\n", argv[0]);
+        return 1;
+    }
+
+    FILE *ql2_bin = fopen(argv[1], "rb");
+    if (ql2_bin == NULL) {
+        perror("Error: ");
+        return 1;
+    }
+
+    FILE *device = fopen(argv[2], "r+b");
+    if (device == NULL) {
+        perror("Error: ");
+        fclose(ql2_bin);
+        return 1;
+    }
+
+    uint32_t stage2_sect = 1;
+    if (argc >= 4)
+        sscanf(argv[3], SCNu32, &stage2_sect);
+
+    char orig_mbr[64];
+    fseek(device, 446, SEEK_SET);
+    fread(orig_mbr, 1, 64, device);
+
+    char ql2_bootsect[512];
+    fseek(ql2_bin, 0, SEEK_SET);
+    fread(ql2_bootsect, 1, 512, ql2_bin);
+    fseek(device, 0, SEEK_SET);
+    fwrite(ql2_bootsect, 1, 512, device);
+
+    char *ql2_stage2 = malloc(63 * 512);
+    fseek(ql2_bin, 512, SEEK_SET);
+    fread(ql2_stage2, 63, 512, ql2_bin);
+    fseek(device, stage2_sect * 512, SEEK_SET);
+    fwrite(ql2_stage2, 63, 512, device);
+    free(ql2_stage2);
+
+    fseek(device, 0x1b0, SEEK_SET);
+    fprintf(device, PRIu32, stage2_sect);
+
+    fseek(device, 446, SEEK_SET);
+    fwrite(orig_mbr, 1, 64, device);
+
+    fclose(ql2_bin);
+    fclose(device);
+
+    return 0;
+}