1 files changed, 85 insertions, 0 deletions
diff --git a/stdio/spawnf.c b/stdio/spawnf.c
new file mode 100644
index 0000000..3e893b1
--- /dev/null
+++ b/stdio/spawnf.c
@@ -0,0 +1,85 @@
+/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
+│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8                                :vi│
+╞══════════════════════════════════════════════════════════════════════════════╡
+│ Copyright 2021 Justine Alexandra Roberts Tunney                              │
+│                                                                              │
+│ Permission to use, copy, modify, and/or distribute this software for         │
+│ any purpose with or without fee is hereby granted, provided that the         │
+│ above copyright notice and this permission notice appear in all copies.      │
+│                                                                              │
+│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL                │
+│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED                │
+│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE             │
+│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL         │
+│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR        │
+│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER               │
+│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR             │
+│ PERFORMANCE OF THIS SOFTWARE.                                                │
+╚─────────────────────────────────────────────────────────────────────────────*/
+#include "libc/errno.h"
+#include "libc/fmt/fmt.h"
+#include "libc/mem/mem.h"
+#include "libc/stdio/spawn.h"
+#include "libc/str/str.h"
+
+/**
+ * Creates object with no actions.
+ */
+int posix_spawn_file_actions_init(posix_spawn_file_actions_t *file_actions) {
+  *file_actions = malloc(sizeof(char));
+  if (!*file_actions) return ENOMEM;
+  strcpy(*file_actions, "");
+  return 0;
+}
+
+/**
+ * Frees object storage and make invalid.
+ */
+int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t *file_actions) {
+  free(*file_actions);
+  *file_actions = NULL;
+  return 0;
+}
+
+/**
+ * Adds new action string to object.
+ */
+static int add_to_file_actions(posix_spawn_file_actions_t *file_actions,
+                               char *new_action) {
+  *file_actions =
+      realloc(*file_actions, strlen(*file_actions) + strlen(new_action) + 1);
+  if (!*file_actions) return ENOMEM;
+  strcat(*file_actions, new_action);
+  return 0;
+}
+
+/**
+ * Add a close action to object.
+ */
+int posix_spawn_file_actions_addclose(posix_spawn_file_actions_t *file_actions,
+                                      int fildes) {
+  char temp[100];
+  sprintf(temp, "close(%d)", fildes);
+  return add_to_file_actions(file_actions, temp);
+}
+
+/**
+ * Add a dup2 action to object.
+ */
+int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t *file_actions,
+                                     int fildes, int newfildes) {
+  char temp[100];
+  sprintf(temp, "dup2(%d,%d)", fildes, newfildes);
+  return add_to_file_actions(file_actions, temp);
+}
+
+/**
+ * Add an open action to object.
+ */
+int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t *file_actions,
+                                     int fildes, const char *path, int oflag,
+                                     unsigned mode) {
+  char temp[100];
+  sprintf(temp, "open(%d,%s*%o,%o)", fildes, path, oflag, mode);
+  return add_to_file_actions(file_actions, temp);
+}