Merge pull request #36 from zeyadhost/main

Add du command for disk usage reporting

docs/usage/commands/du.md

@@ -0,0 +1,90 @@
+# du
+
+`du` (disk usage) reports the disk space used by files and directories.
+
+## Usage
+
+```sh
+du [OPTIONS]... [FILE]...
+```
+
+## Description
+
+By default, `du` prints human-readable sizes for each file and directory it encounters, starting from the current directory (`.`) if no path is given.
+
+## Options
+
+| Option | Description |
+| :--- | :--- |
+| `-s, --summarize` | Show only a total for each argument, suppressing per-entry output. |
+| `-a, --all` | Write counts for all files, not just directories. |
+| `-d, --max-depth=N` | Stop at depth N; show only entries at or above depth N. |
+| `-c, --total` | Print a grand total after all arguments have been processed. |
+| `-b, --bytes` | Print sizes in exact bytes instead of human-readable units. |
+| `-H, --human-readable` | Accepted for compatibility; human-readable is the default. |
+| `--help` | Display usage information and exit. |
+
+## Output Format
+
+Each line shows a size followed by the path:
+
+```
+SIZE    PATH
+```
+
+Sizes are formatted as `B`, `KB`, `MB`, or `GB` by default, with one decimal place when appropriate (e.g., `1.5 GB`). The `-b` option overrides this to show exact byte counts.
+
+## Examples
+
+Show disk usage for the current directory:
+
+```sh
+du
+```
+
+Show disk usage for a specific path:
+
+```sh
+du /bin
+```
+
+Show only totals per argument (`-s`):
+
+```sh
+du -s /bin /home
+```
+
+Show all files and directories recursively (`-a`):
+
+```sh
+du -a /bin
+```
+
+Limit output to depth 1 (`-d`):
+
+```sh
+du -d 1 /
+```
+
+Print a grand total after processing (`-c`):
+
+```sh
+du -c /bin /home
+```
+
+Show exact byte counts (`-b`):
+
+```sh
+du -b /bin
+```
+
+## How It Works
+
+`du` uses `sys_get_file_info()` to read file sizes and `sys_list()` to enumerate directory contents recursively. The command skips the synthetic `.` and `..` entries and continues processing remaining paths if one path is inaccessible, printing an error for the failed path.
+
+The size reported is the **apparent file size** (the logical size stored in the directory entry), not the allocated disk blocks. This is consistent with how BoredOS reports file sizes through the filesystem API.
+
+## Exit Status
+
+- `0`: Success
+- `1`: One or more paths could not be accessed or listed

docs/usage/terminal.md

@@ -54,6 +54,7 @@ Below are some of the most used commands available in `/bin`:
 | `mkdir` | Create a new directory. |
 | `man` | View the manual for a specific command (e.g., `man ls`). |
 | `lsblk` | List block devices and partitions with size, type, filesystem, label, and flags. |
+| `du` | Report disk usage for files and directories, recursively. |
 | `sysfetch` | Display system and hardware information. |
 
 

src/userland/cli/du.c

@@ -0,0 +1,203 @@
+// Copyright (c) 2026 zeyadhost (https://github.com/zeyadhost)
+// 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syscall.h>
+#include <stdint.h>
+
+#define MAX_ENTRIES 1024
+#define DU_KB 1024ULL
+#define DU_MB (1024ULL * 1024ULL)
+#define DU_GB (1024ULL * 1024ULL * 1024ULL)
+
+static int opt_summarize = 0;
+static int opt_all = 0;
+static int opt_max_depth = -1;
+static int opt_total = 0;
+static int opt_bytes = 0;
+
+static uint64_t grand_total = 0;
+
+static void usage(void) {
+    printf("Usage: du [options]..[file]\n");
+    printf("Summarize disk usage of the set of FILEs, recursively for directories.\n\n");
+    printf("Options:\n");
+    printf("  -s, --summarize       display only a total for each argument\n");
+    printf("  -a, --all             write counts for all files, not just directories\n");
+    printf("  -d, --max-depth=N     print the total for a directory only if it is N or\n");
+    printf("                        fewer levels below the command line argument\n");
+    printf("  -c, --total           produce a grand total\n");
+    printf("  -b, --bytes           print sizes in bytes\n");
+    printf("  -H, --human-readable  print sizes in human readable format (default)\n");
+    printf("      --help            display this help and exit\n");
+}
+
+static void print_size(uint64_t bytes, const char *path) {
+    if (opt_bytes) {
+        printf("%llu\t%s\n", (unsigned long long)bytes, path);
+        return;
+    }
+    
+    char size_str[32];
+    uint64_t unit = 1;
+    const char *suffix = "B";
+
+    if (bytes >= DU_GB) {
+        unit = DU_GB;
+        suffix = "GB";
+    } else if (bytes >= DU_MB) {
+        unit = DU_MB;
+        suffix = "MB";
+    } else if (bytes >= DU_KB) {
+        unit = DU_KB;
+        suffix = "KB";
+    }
+
+    if (unit == 1) {
+        snprintf(size_str, sizeof(size_str), "%llu%s", (unsigned long long)bytes, suffix);
+    } else {
+        // Round to one decimal place
+        uint64_t whole = bytes / unit;
+        uint64_t rem = bytes % unit;
+        uint64_t tenth = (rem * 10ULL + unit / 2ULL) / unit;
+
+        if (tenth >= 10ULL) {
+            whole++;
+            tenth = 0;
+        }
+
+        if (tenth == 0) {
+            snprintf(size_str, sizeof(size_str), "%llu%s", (unsigned long long)whole, suffix);
+        } else {
+            snprintf(size_str, sizeof(size_str), "%llu.%llu%s", (unsigned long long)whole, (unsigned long long)tenth, suffix);
+        }
+    }
+    printf("%s\t%s\n", size_str, path);
+}
+
+static void join_path(char *dest, size_t size, const char *p1, const char *p2) {
+    if (strcmp(p1, "/") == 0) {
+        snprintf(dest, size, "/%s", p2);
+    } else if (p1[strlen(p1) - 1] == '/') {
+        snprintf(dest, size, "%s%s", p1, p2);
+    } else {
+        snprintf(dest, size, "%s/%s", p1, p2);
+    }
+}
+
+static uint64_t do_du(const char *path, int depth) {
+    FAT32_FileInfo info;
+    if (sys_get_file_info(path, &info) < 0) {
+        printf("du: cannot access '%s'\n", path);
+        return 0;
+    }
+    
+    if (!info.is_directory) {
+        if (opt_all || (depth == 0)) {
+            if (opt_max_depth == -1 || depth <= opt_max_depth) {
+                if (!opt_summarize || depth == 0) {
+                    print_size(info.size, path);
+                }
+            }
+        }
+        return info.size;
+    }
+    
+    uint64_t total_size = info.size;
+    
+    FAT32_FileInfo *entries = malloc(sizeof(FAT32_FileInfo) * MAX_ENTRIES);
+    if (!entries) {
+        printf("du: out of memory for '%s'\n", path);
+        return total_size;
+    }
+    
+    int count = sys_list(path, entries, MAX_ENTRIES);
+    if (count < 0) {
+        printf("du: cannot read directory '%s'\n", path);
+        free(entries);
+        return total_size;
+    }
+    
+    // Recurse into subdirectories
+    for (int i = 0; i < count; i++) {
+        if (strcmp(entries[i].name, ".") == 0 || strcmp(entries[i].name, "..") == 0) {
+            continue;
+        }
+
+        char child_path[1024];
+        join_path(child_path, sizeof(child_path), path, entries[i].name);
+
+        total_size += do_du(child_path, depth + 1);
+    }
+
+    free(entries);
+
+    // Print directory size at this depth
+    if (!opt_summarize) {
+        if (opt_max_depth == -1 || depth <= opt_max_depth) {
+            print_size(total_size, path);
+        }
+    } else if (depth == 0) {
+        // With -s, only print the root of each requested path
+        print_size(total_size, path);
+    }
+
+    return total_size;
+}
+
+int main(int argc, char **argv) {
+    char **paths = malloc(sizeof(char*) * argc);
+    int num_paths = 0;
+    
+    for (int i = 1; i < argc; i++) {
+        if (strcmp(argv[i], "-s") == 0 || strcmp(argv[i], "--summarize") == 0) {
+            opt_summarize = 1;
+        } else if (strcmp(argv[i], "-a") == 0 || strcmp(argv[i], "--all") == 0) {
+            opt_all = 1;
+        } else if (strcmp(argv[i], "-c") == 0 || strcmp(argv[i], "--total") == 0) {
+            opt_total = 1;
+        } else if (strcmp(argv[i], "-b") == 0 || strcmp(argv[i], "--bytes") == 0) {
+            opt_bytes = 1;
+        } else if (strcmp(argv[i], "-H") == 0 || strcmp(argv[i], "--human-readable") == 0) {
+            // No-op: human-readable is the default
+        } else if (strcmp(argv[i], "-d") == 0) {
+            if (i + 1 < argc) {
+                opt_max_depth = atoi(argv[++i]);
+            } else {
+                printf("du: option requires an argument -- '-d'\n");
+                return 1;
+            }
+        } else if (strncmp(argv[i], "--max-depth=", 12) == 0) {
+            opt_max_depth = atoi(argv[i] + 12);
+        } else if (strcmp(argv[i], "--help") == 0) {
+            usage();
+            free(paths);
+            return 0;
+        } else if (argv[i][0] == '-') {
+            printf("du: invalid option -- '%s'\n", argv[i]);
+            usage();
+            free(paths);
+            return 1;
+        } else {
+            paths[num_paths++] = argv[i];
+        }
+    }
+    
+    if (num_paths == 0) {
+        grand_total += do_du(".", 0);
+    } else {
+        for (int i = 0; i < num_paths; i++) {
+            grand_total += do_du(paths[i], 0);
+        }
+    }
+    
+    if (opt_total) {
+        print_size(grand_total, "total");
+    }
+    
+    free(paths);
+    return 0;
+}