feature(install): add system installer and FAT32 formatting utility

src/userland/cli/mkfs_fat.c

@@ -0,0 +1,66 @@
+// Copyright (c) 2023-2026 Chris (boreddevnl)
+// This software is released under the GNU General Public License v3.0. See LICENSE file for details.
+// This header needs to maintain in any file it is present in, as per the GPL license terms.
+#include "../libc/syscall.h"
+#include "../libc/stdlib.h"
+#include "../libc/string.h"
+#include "../libc/stdio.h"
+
+static int sc_strcmp(const char *a, const char *b) {
+    while (*a && *a == *b) { a++; b++; }
+    return (unsigned char)*a - (unsigned char)*b;
+}
+
+int main(int argc, char **argv) {
+    const char *devname = NULL;
+    const char *label   = "BOREDOS";
+    int fat_type = 32;
+
+    for (int i = 1; i < argc; i++) {
+        if (sc_strcmp(argv[i], "-F") == 0 && i + 1 < argc) {
+            fat_type = 0;
+            const char *s = argv[++i];
+            while (*s >= '0' && *s <= '9') fat_type = fat_type * 10 + (*s++ - '0');
+        } else if (sc_strcmp(argv[i], "-n") == 0 && i + 1 < argc) {
+            label = argv[++i];
+        } else if (sc_strcmp(argv[i], "-h") == 0 || sc_strcmp(argv[i], "--help") == 0) {
+            printf("mkfs.fat [OPTIONS] /dev/DEVICE\n");
+            printf("  -F 32       FAT type (32 only)\n");
+            printf("  -n LABEL    Volume label (max 11 chars, default: BOREDOS)\n");
+            return 0;
+        } else if (argv[i][0] != '-') {
+            devname = argv[i];
+            if (devname[0]=='/' && devname[1]=='d' && devname[2]=='e' && devname[3]=='v' && devname[4]=='/')
+                devname += 5;
+        }
+    }
+
+    if (!devname) {
+        printf("Usage: mkfs.fat -F 32 [-n LABEL] /dev/DEVICE\n");
+        return 1;
+    }
+    if (fat_type != 32) {
+        printf("[ERROR] Only FAT32 (-F 32) is supported.\n");
+        return 1;
+    }
+
+    disk_info_t d;
+    int found = 0;
+    int n = sys_disk_get_count();
+    for (int i = 0; i < n; i++) {
+        if (sys_disk_get_info(i, &d) != 0) continue;
+        if (sc_strcmp(d.devname, devname) == 0) { found = 1; break; }
+    }
+    if (!found) { printf("[ERROR] Device not found: /dev/%s\n", devname); return 1; }
+    if (!d.is_partition) { printf("[ERROR] /dev/%s is a whole disk, not a partition.\n", devname); return 1; }
+    if (d.total_sectors < 65536) {
+        printf("[ERROR] Partition too small (< 32 MB) for FAT32.\n");
+        return 1;
+    }
+
+    printf("Formatting /dev/%s as FAT32 (label: %s)...\n", devname, label);
+    int ret = sys_disk_mkfs_fat32(devname, label);
+    if (ret != 0) { printf("[ERROR] Format failed.\n"); return 1; }
+    printf("Done.\n");
+    return 0;
+}