split. better hostname

1 files changed, 91 insertions, 0 deletions

diff --git a/src/lsh_builtins.c b/src/lsh_builtins.c
new file mode 100644
index 0000000..34aced5
--- /dev/null
+++ b/src/lsh_builtins.c
@@ -0,0 +1,91 @@
+#ifndef shell_builtins
+#define shell_builtins
+
+#include "lsh_main_func.c"
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+/*
+  Function Declarations for builtin shell commands:
+ */
+
+int lsh_cd(char **args);
+int lsh_help(char **args);
+int lsh_exit(char **args);
+
+/*
+  List of builtin commands, followed by their corresponding functions.
+ */
+char *builtin_str[] = {
+  "cd",
+  "help",
+  "exit"
+};
+
+int (*builtin_func[]) (char **) = {
+  &lsh_cd,
+  &lsh_help,
+  &lsh_exit
+};
+
+int lsh_num_builtins() {
+  return sizeof(builtin_str) / sizeof(char *);
+}
+
+/*
+  Builtin function implementations.
+*/
+int lsh_cd(char **args)
+{
+  if (args[1] == NULL) {
+    fprintf(stderr, "lsh: expected argument to \"cd\"\n");
+  } else {
+    if (chdir(args[1]) != 0) {
+      perror("lsh");
+    }
+  }
+  return 1;
+}
+
+int lsh_help(char **args)
+{
+  int i;
+  printf("Stephen Brennan's LSH\n");
+  printf("Type program names and arguments, and hit enter.\n");
+  printf("The following are built in:\n");
+
+  for (i = 0; i < lsh_num_builtins(); i++) {
+    printf("  %s\n", builtin_str[i]);
+  }
+
+  printf("Use the man command for information on other programs.\n");
+  return 1;
+}
+
+int lsh_exit(char **args)
+{
+  return 0;
+}
+
+
+
+int lsh_execute(char **args)
+{
+  int i;
+
+  if (args[0] == NULL) {
+    // An empty command was entered.
+    return 1;
+  }
+
+  for (i = 0; i < lsh_num_builtins(); i++) {
+    if (strcmp(args[0], builtin_str[i]) == 0) {
+      return (*builtin_func[i])(args);
+    }
+  }
+
+  return lsh_launch(args);
+}
+
+#endif