1 files changed, 72 insertions, 0 deletions
diff --git a/main.c b/main.c
new file mode 100644
index 0000000..5d4716d
--- /dev/null
+++ b/main.c
@@ -0,0 +1,72 @@
+#include "./main.h"
+
+void printhelp() {
+  fprintf(stderr, "even: a binary by ZachIR to check if a number is even or ");
+  fprintf(stderr, "odd.\n");
+  fprintf(stderr, "\t-h: prints this help message\n");
+  fprintf(stderr, "\t-v: prints the version\n");
+  fprintf(stderr, "\t-c: prints the copyright information\n");
+  return;
+}
+
+void printcopyright() {
+  fprintf(stderr, "Copyright (c) 2024 Zachary Smith\n");
+  fprintf(stderr, "even is Free software under the MIT license, and is ");
+  fprintf(stderr, "provided without warranty of any kind.\n");
+  return;
+}
+
+void printversion() {
+  fprintf(stderr, "even version %s, 2024\n", VERSION);
+  return;
+}
+
+int main(int argc, char **argv) {
+  bool quiet;
+  size_t string_length;
+  uint8_t digit;
+
+  digit = 0;
+  quiet = false;
+  string_length = 0;
+
+  if (argc > 1) {
+    for (size_t i = 1; i < argc; i++) {
+      if (argv[i][0] == '-') {
+        switch (argv[i][1]) {
+          case 'h':
+            printhelp();
+            return SUCCESS;
+          case 'c':
+            printcopyright();
+            return SUCCESS;
+          case 'v':
+            printversion();
+            return SUCCESS;
+          case 'q':
+            quiet = true;
+            break;
+          default:
+            printhelp();
+            return -1;
+        }
+      }
+    }
+    assert(strlen(argv[argc - 1]) < SIZE_MAX);
+    string_length = strlen(argv[argc - 1]);
+    digit = argv[argc - 1][string_length - 1];
+    digit -= '0';
+    if (quiet) {
+      if (digit <= 10)
+        return ((digit & 1) == 0) ? SUCCESS : ERR;
+    } else {
+      if ((digit & 1) == 0) {
+        fprintf(stdout, "even\n");
+      } else {
+        fprintf(stdout, "odd\n");
+      }
+      return SUCCESS;
+    }
+  }
+  return ERR;
+}