Move everything into a new repo.

1 files changed, 65 insertions, 0 deletions

diff --git a/userland/minibox/minibox.c b/userland/minibox/minibox.c
new file mode 100644
index 0000000..63eaee8
--- /dev/null
+++ b/userland/minibox/minibox.c
@@ -0,0 +1,65 @@
+// SPDX-License-Identifier: 0BSD
+// TODO: Possibly use getprogname() instead of using argv[0] to get the
+// utility name.
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "utilities/include.h"
+
+#define ARRAY_LENGTH(array) (sizeof(array) / sizeof((array)[0]))
+
+typedef struct Command {
+  char *name;
+  int (*function)(int, char **);
+} Command;
+
+#define STR2(_x) #_x
+#define STR(_x) STR2(_x)
+#define COMMAND(NAME)                                                          \
+  { STR(NAME), NAME##_main }
+
+Command utilities[] = {COMMAND(minibox), COMMAND(ascii), COMMAND(echo),
+                       COMMAND(cat),     COMMAND(yes),   COMMAND(wc),
+                       COMMAND(init),    COMMAND(ls),    COMMAND(touch),
+                       COMMAND(ed)};
+
+char *parse_filename(char *str) {
+  char *tmp = NULL, *is = str;
+  for (; *is++;)
+    if ('/' == *is)
+      tmp = is;
+  return tmp ? tmp + 1 : str;
+}
+
+void usage(void) {
+  for (int i = 0; i < ARRAY_LENGTH(utilities); i++) {
+    printf("%s ", utilities[i].name);
+  }
+  printf("\n");
+}
+
+int main(int argc, char **argv) {
+  if (argc < 1)
+    return 1;
+#ifdef SINGLE_MAIN
+  return utilities[0].function(argc, argv);
+#endif
+
+  // argv[0] will be checked to determine what utility
+  // is supposed to be ran.
+  // NOTE: "minibox" is a utility than can be ran. "minibox"
+  //       will switch argv and argc so that argv[1] -> argv[0]
+  //       then it will rerun main(). This allows utlities
+  //       to be ran like "minibox <utility> <arguments>" or
+  //       even "minibox minibox <utility> <arguments>"
+  const char *utility_name = parse_filename(argv[0]);
+  if (*utility_name == '/')
+    utility_name++;
+  for (int i = 0; i < ARRAY_LENGTH(utilities); i++)
+    if (0 == strcmp(utility_name, utilities[i].name))
+      return utilities[i].function(argc, argv);
+
+  usage();
+  return 0;
+}