add: rm

src/disk.c

@@ -1,6 +1,8 @@
 /** @file */
 #include "disk.h"
 #include "env.h"
+#include "struct.h"
+#include <linux/limits.h>
 #include <stdio.h>
 #include <string.h>
 #include <unistd.h>
@@ -80,6 +82,101 @@ int allocate_node(disk *disk, inode *parent, char *name, char type) {
   return inode_index;
 }
 
+int remove_file(disk *disk, inode *parent, inode *inode_to_remove,
+                int inode_to_remove_idx) {
+
+  if (parent == inode_to_remove) {
+    dprintf(STDERR_FILENO, "rm: can't delete root\n");
+    return -1;
+  }
+  int parent_bloc_idx = parent->blocs[0];
+  if (parent_bloc_idx == -1) {
+    return -1;
+  }
+
+  int found = 0;
+
+  // on efface la référence du fichier dans son parent
+  for (int i = 0; i < MAX_BYTES_PER_BLOC && !found;
+       i += MAX_INODE_NAME + sizeof(int)) {
+    if (*(int *)&disk->blocs[parent_bloc_idx].datas[i + MAX_INODE_NAME] ==
+        inode_to_remove_idx) {
+      memset(&disk->blocs[parent_bloc_idx].datas[i], 0,
+             MAX_INODE_NAME + sizeof(int));
+      found = 1;
+    }
+  }
+
+  // on efface tout le contenu du fichier
+  int bloc_inode_idx = inode_to_remove->blocs[0];
+  memset(&disk->blocs[bloc_inode_idx].datas[0], 0, MAX_BYTES_PER_BLOC);
+
+  disk->owned_blocs[inode_to_remove->blocs[0]] = 0;
+  inode_to_remove->blocs[0] = -1;
+  inode_to_remove->perms = 0b000000000;
+  inode_to_remove->filetype = TYPE_NULL;
+
+  return 1;
+}
+
+int do_rm(disk *disk, char *filepath) {
+    char *parent_path = NULL;
+    char *dirname = NULL;
+
+    if (get_dirname_and_parent_path_by_absolute_path(filepath, &parent_path, &dirname) == -1) {
+        dprintf(STDERR_FILENO, "rm: erreur de chemin\n");
+        return -1;
+    }
+
+    int parent_index = 0;
+    char *token = strtok(parent_path, "/");
+
+    while (token != NULL) {
+        parent_index = find_dir_inode_by_name(token, parent_index, disk);
+
+        if (parent_index == -1) {
+            dprintf(STDERR_FILENO, "rm: le chemin '%s' n'existe pas\n", token);
+            free(parent_path); free(dirname);
+            return -1;
+        }
+
+        if (disk->inodes[parent_index].filetype != TYPE_DIRECTORY) {
+            dprintf(STDERR_FILENO, "rm: '%s' n'est pas un dossier\n", token);
+            free(parent_path); free(dirname);
+            return -1;
+        }
+
+        token = strtok(NULL, "/");
+    }
+
+    int file_index = find_dir_inode_by_name(dirname, parent_index, disk);
+
+    if (file_index == -1) {
+        dprintf(STDERR_FILENO, "rm: impossible de supprimer '%s': Aucun fichier de ce nom\n", dirname);
+        free(parent_path); free(dirname);
+        return -1;
+    }
+
+    if (disk->inodes[file_index].filetype != TYPE_FILE && 
+        disk->inodes[file_index].filetype != TYPE_SYMBOLIC_LINK) {
+        dprintf(STDERR_FILENO, "rm: impossible de supprimer '%s': est un dossier\n", dirname);
+        free(parent_path); free(dirname);
+        return -1;
+    }
+
+    int res = remove_file(disk, &disk->inodes[parent_index], &disk->inodes[file_index], file_index);
+
+    if (res == 1) {
+    } else {
+        dprintf(STDERR_FILENO, "rm: erreur fatale lors de la suppression en mémoire\n");
+    }
+
+    free(parent_path);
+    free(dirname);
+
+    return (res == 1) ? 0 : -1;
+}
+
 int create_file(disk *disk, inode *parent, char *filename) {
   return allocate_node(disk, parent, filename, TYPE_FILE);
 }
@@ -110,7 +207,7 @@ int do_touch(disk *d, char *filepath) {
 
   if (get_name_and_parent_path_by_absolute_path(filepath, &parent_path,
                                                 &dirname) == -1) {
-    dprintf(STDERR_FILENO, "touch: erreur jsp");
+    dprintf(STDERR_FILENO, "touch: erreur jsp\n");
     return -1;
   }
 
@@ -328,11 +425,6 @@ char *read_in_file(disk *d, int file_index) {
   return out;
 }
 
-void init_test_files(disk *d) {
-  int inode_idx = create_file(d, &d->inodes[0], "test");
-  write_in_file(d, inode_idx, "Contenu du fichier :)\n");
-}
-
 /**
  * @brief Créer un fichier "disk" de taille MAX_BYTES_PER_BLOC * MAX_BLOCS,
  * renvoi ce disque
@@ -365,8 +457,6 @@ disk create_disk() {
   int point_inode = 1;
   memcpy(&d.blocs[0].datas[MAX_INODE_NAME], &point_inode, sizeof(int));
 
-  init_test_files(&d);
-
   int n = fwrite(&d, sizeof(disk), 1, fptr);
   if (n == 1) {
     dprintf(STDOUT_FILENO, "Disk of size %.2fKb created successfully.\n",
@@ -392,12 +482,12 @@ disk open_disk(char *filename) {
   return d;
 }
 
-void persist_on_disk(disk* d) {
+void persist_on_disk(disk *d) {
   FILE *fptr;
   fptr = fopen("disk", "wb");
 
   int n = fwrite(d, sizeof(disk), 1, fptr);
   if (n != 1) {
-    dprintf(STDERR_FILENO, "Failed to persist datas on disk\n");
+    dprintf(STDERR_FILENO, "Failed to persist datas on disk.\n");
   }
 }

src/disk.h

@@ -18,5 +18,6 @@ int do_ls(disk *d, char* path);
 int do_touch(disk *d, char *filepath);
 int do_mkdir(disk* d, char *dirpath);
 int do_df(disk *d);
+int do_rm(disk *disk, char *filepath);
 int find_dir_inode_by_name(char *name, int dir_index, disk *d);
 void persist_on_disk(disk* d);

src/exec.c

@@ -98,7 +98,9 @@ int child_process_job(disk *d, char **args) {
     persist_on_disk(d);
   } else if (strcmp("df", args[0]) == 0) {
     do_df(d);
-  } else {
+  } else if (strcmp("rm", args[0]) == 0) {
+    do_rm(d, args[1]);
+  }else {
     dprintf(STDERR_FILENO, "%s: no such command\n", args[0]);
   }
   return 1;

src/utils.c

@@ -41,6 +41,37 @@ int get_name_and_parent_path_by_absolute_path(char* path, char** parent_path, ch
   return 0;
 }
 
+int get_dirname_and_parent_path_by_absolute_path(char* dirpath, char** parent_path, char** dirname) {
+    if (dirpath == NULL || strlen(dirpath) == 0) {
+        return -1; 
+    }
+
+    size_t len = strlen(dirpath);
+    if (len > 1 && dirpath[len - 1] == '/') {
+        dirpath[len - 1] = '\0';
+    }
+
+    char *last_occ = strrchr(dirpath, '/');
+
+    if (last_occ == NULL) {
+        *parent_path = strdup(get_env_value("PWD")); 
+        *dirname = strdup(dirpath);
+    } else {
+        
+        *dirname = strdup(last_occ + 1);
+
+        if (last_occ == dirpath) {
+            *parent_path = strdup("/");
+        } else {
+            *last_occ = '\0';
+            *parent_path = strdup(dirpath);
+            *last_occ = '/';
+        }
+    }
+    
+    return 0;
+}
+
 void canonicalize_path(char *path) {
   char *tokens[100];
   int depth = 0;

src/utils.h

@@ -9,3 +9,4 @@
 void canonicalize_path(char *path);
 void format_path(char *dest, char *src, int dest_len);
 int get_name_and_parent_path_by_absolute_path(char* dirpath, char** parent_path, char** dirname);
+int get_dirname_and_parent_path_by_absolute_path(char* dirpath, char** parent_path, char** dirname);