finish report

doc/code/environ.txt

@@ -0,0 +1,33 @@
+typedef struct {
+    StringArray *keys;
+    StringArray *values;
+    size_t size;
+} ArrayList;
+
+void set_array_list(ArrayList *array_list, char *key, char *value) {
+    if (array_list->keys == NULL) {
+        array_list->keys = create_string_array();
+        array_list->values = create_string_array();
+    }
+    for (size_t i = 0; i < array_list->size; i++) {
+        if (strcmp(array_list->keys->array[i], key) == 0) {
+            array_list->values->array[i] = realloc(array_list->values->array[i], strlen(value) * sizeof(char *));
+            strcpy(array_list->values->array[i], value);
+            return;
+        }
+    }
+    insert_string_array(array_list->keys, key);
+    insert_string_array(array_list->values, value);
+    array_list->size++;
+}
+
+char *get_array_list(ArrayList *array_list, char *key) {
+    if (array_list->keys != NULL) {
+        for (size_t i = 0; i < array_list->size; i++) {
+            if (strcmp(array_list->keys->array[i], key) == 0) {
+                return array_list->values->array[i];
+            }
+        }
+    }
+    return NULL;
+}

doc/code/redirection.txt

@@ -0,0 +1,44 @@
+typedef struct {
+    int fd;
+    int fd_new;
+    int fd_copy;
+    char *filename;
+    int flags;
+} Redirect;
+
+Redirect in = {.fd = STDIN_FILENO, .fd_new = -1, .fd_copy = -1, .filename = NULL, .flags = O_RDONLY};
+Redirect out = {.fd = STDOUT_FILENO, .fd_new = -1, .fd_copy = -1, .filename = NULL, .flags = O_WRONLY | O_CREAT | O_TRUNC};
+Redirect err = {.fd = STDERR_FILENO, .fd_new = -1, .fd_copy = -1, .filename = NULL, .flags = O_WRONLY | O_CREAT | O_TRUNC};
+
+void open_redirect(Redirect *redirect) {
+    redirect->fd_copy = dup(redirect->fd);
+    if (redirect->fd_copy == -1) {
+        perror("dup");
+    }
+    else {
+        redirect->fd_new = open(redirect->filename, redirect->flags, 0664);
+        if (redirect->fd_new == -1) {
+            fprintf(stderr, "open: Could not open file %s: \"%s\"\n", redirect->filename, strerror(errno));
+        }
+        else {
+            if (close(redirect->fd) == -1) {
+                perror("close");
+            }
+            if (dup(redirect->fd_new) == -1) {
+                perror("dup");
+            }
+        }
+    }
+}
+
+void close_redirect(Redirect *redirect) {
+    if (close(redirect->fd_new) == -1) {
+        perror("close");
+    }
+    if (dup2(redirect->fd_copy, redirect->fd) == -1) {
+        perror("dup2");
+    }
+    if (close(redirect->fd_copy) == -1) {
+        perror("close");
+    }
+}