From 0c827110ee79265cf697e6f78a95b0bbb6947198 Mon Sep 17 00:00:00 2001
From: Matt Strapp <matt@mattstrapp.net>
Date: Thu, 27 Jan 2022 16:06:24 -0600
Subject: Start 4211 fun

Signed-off-by: Matt Strapp <matt@mattstrapp.net>
---
 LICENSE              | 37 +++++++++++++++++--------------
 csci4211/ipaddress.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 82 insertions(+), 17 deletions(-)
 create mode 100644 csci4211/ipaddress.c

diff --git a/LICENSE b/LICENSE
index c49ef5f..00d2e13 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,21 +1,24 @@
-MIT License
+This is free and unencumbered software released into the public domain.
 
-Copyright (c) 2018-2021 Matt Strapp
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
 
-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:
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
 
-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 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.
 
-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.
+For more information, please refer to <http://unlicense.org/>
\ No newline at end of file
diff --git a/csci4211/ipaddress.c b/csci4211/ipaddress.c
new file mode 100644
index 0000000..662bf99
--- /dev/null
+++ b/csci4211/ipaddress.c
@@ -0,0 +1,62 @@
+// Author Name: Matt Strapp
+// Date: 2022-01-26
+// x500: strap012
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int IPv4ToInt(char *ipv4, int isBigEndian) {
+  unsigned int ipv4Int = 0;
+  short int i = 0;
+  char *chunk = strtok(ipv4, ".");
+  while (chunk != NULL) {
+    int ipv4Segment = atoi(chunk);
+    if (ipv4Segment > 255 || ipv4Segment < 0) {
+      printf("ERROR\n");
+      exit(0);
+    }
+    ipv4Int = (isBigEndian) ? (ipv4Int << 8) | ipv4Segment
+                            : (ipv4Int >> 8) + (ipv4Segment << 24);
+    i++;
+    chunk = strtok(NULL, ".");
+  }
+  if (i != 4) {
+    printf("ERROR\n");
+    exit(0);
+  }
+  return ipv4Int;
+}
+
+char *IntToIPv4(long ipv4_int, int isBigEndian) {
+  if (ipv4_int > 4294967295 || ipv4_int < 0) {
+    printf("ERROR\n");
+    exit(0);
+  }
+  char *ipv4 = (char *)calloc(16, sizeof(char));
+  int i = 0;
+  while (i < 4) {
+    int ipv4Segment = (isBigEndian) ? (ipv4_int >> (8 * (3 - i))) & 255
+                                    : (ipv4_int >> (8 * i)) & 255;
+    sprintf(ipv4 + strlen(ipv4), "%d", ipv4Segment);
+    if (i != 3)
+      sprintf(ipv4 + strlen(ipv4), ".");
+    i++;
+  }
+  return ipv4;
+}
+
+int main(int argc, char **argv) {
+  int toHuman = atoi(argv[1]);
+  int isBigEndian = atoi(argv[3]);
+  if (toHuman) {
+    long toIpv4 = strtol(argv[2], NULL, 10);
+    char *ret = IntToIPv4(toIpv4, isBigEndian);
+    printf("%s\n", ret);
+    free(ret);
+  } else {
+    unsigned int ret = IPv4ToInt(argv[2], isBigEndian);
+    printf("%u\n", ret);
+    return 0;
+  }
+}
\ No newline at end of file
-- 
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