From 0689d6bbbb0e6ecc3934d8e4a2e9b0fc66a0b29f Mon Sep 17 00:00:00 2001
From: zachir <zachir@librem.one>
Date: Wed, 14 Feb 2024 23:54:52 -0600
Subject: even: Add bin to check if number is even

even is a basic binary to check if the provided number is even.
---
 .gitignore |  5 +++++
 LICENSE    | 19 +++++++++++++++++
 Makefile   | 16 ++++++++++++++
 main.c     | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 main.h     | 25 ++++++++++++++++++++++
 5 files changed, 137 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 LICENSE
 create mode 100644 Makefile
 create mode 100644 main.c
 create mode 100644 main.h

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..4c6f5e9
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,5 @@
+# Ignore object files
+*.o
+
+#Ignore the compiled binary
+even
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..e38857d
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,19 @@
+Copyright (c) 2024 Zachary Smith
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
diff --git a/Makefile b/Makefile
new file mode 100644
index 0000000..1d7d879
--- /dev/null
+++ b/Makefile
@@ -0,0 +1,16 @@
+C_SRC := main.c
+C_OBJ := main.o
+B_NAM := even
+CC := gcc
+C_FLG := -O3 -Wall -Wpedantic -Werror
+O_FLG := ${C_FLG}
+
+${B_NAM}: ${C_OBJ}
+	${CC} ${O_FLG} -o ${B_NAM} ${C_OBJ}
+
+${C_OBJ}: ${C_SRC}
+	${CC} ${C_FLG} -c ${C_SRC}
+
+clean:
+	rm -f ${B_NAM} ${C_OBJ}
+
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;
+}
diff --git a/main.h b/main.h
new file mode 100644
index 0000000..61f7b1c
--- /dev/null
+++ b/main.h
@@ -0,0 +1,25 @@
+// Copyright (c) 2024 Zachary Smith
+#ifndef MAIN_H_
+#define MAIN_H_
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#include <assert.h>
+#include <string.h>
+
+#define VERSION "1.0.0"
+
+enum return_t {
+  SUCCESS = 0,
+  ERR
+};
+
+void printhelp(void);
+void printcopyright(void);
+void printversion(void);
+int main(int, char**);
+
+#endif  // MAIN_H_
-- 
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