Removed submodules

p1-sh/utils/env.c

@@ -0,0 +1,65 @@
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static void usage (void);
+
+bool
+is_util (char *str)
+{
+  char *utils[] = { "./bin/cat",  "./bin/chmod", "./bin/cut",   "./bin/env",
+                    "./bin/head", "./bin/ls",    "./bin/repeat" };
+
+  for (size_t i = 0; i < 7; i++)
+    {
+      if (strcmp (str, utils[i]) == 0)
+        {
+          return true;
+        }
+    }
+
+  return false;
+}
+
+int
+main (int argc, char *argv[], char *envp[])
+{
+  size_t envp_count = 0;
+  while (envp[envp_count] != NULL) envp_count++;
+
+  size_t env_args = 0;
+  char* util = NULL;
+
+  for (size_t i = 1; i < argc; i++)
+    {
+      if (is_util (argv[i])) {
+        util = argv[i];
+        break;
+      }
+
+      env_args++;
+    }
+
+  if (util == NULL) {
+    usage();
+    exit(EXIT_FAILURE);
+  }
+
+  char **combined_envp = calloc (envp_count + env_args + 1, sizeof (char *));
+  memcpy (combined_envp, envp, envp_count * sizeof (char *));
+  memcpy (combined_envp + envp_count, &argv[1], env_args * sizeof (char *));
+  combined_envp[envp_count + env_args] = NULL;
+
+  execve(util, &argv[env_args + 1], combined_envp);
+
+  return EXIT_SUCCESS;
+}
+
+static void
+usage (void)
+{
+  printf ("env, set environment variables and execute program\n");
+  printf ("usage: env [name=value ...] PROG ARGS\n");
+}