From 4c9614342e0cc6e509324f21b5c2a097e991442a Mon Sep 17 00:00:00 2001
From: Roland W-H <r.weirhowell@gmail.com>
Date: Tue, 8 Nov 2022 11:39:30 +0000
Subject: [PATCH] preliminary implimentation of dynamic-sized input

---
 caesarcrypt.vcxproj         |  2 ++
 caesarcrypt.vcxproj.filters |  6 +++++
 src/caesarcrypt.c           |  8 +++++--
 src/dyninput.c              | 47 +++++++++++++++++++++++++++++++++++++
 src/dyninput.h              | 16 +++++++++++++
 5 files changed, 77 insertions(+), 2 deletions(-)
 create mode 100644 src/dyninput.c
 create mode 100644 src/dyninput.h

diff --git a/caesarcrypt.vcxproj b/caesarcrypt.vcxproj
index 17290f0..aaf6fc9 100644
--- a/caesarcrypt.vcxproj
+++ b/caesarcrypt.vcxproj
@@ -13,12 +13,14 @@
   <ItemGroup>
     <ClCompile Include="src\caesarcrypt.c" />
     <ClCompile Include="src\crypt.c" />
+    <ClCompile Include="src\dyninput.c" />
   </ItemGroup>
   <ItemGroup>
     <None Include="caesarcrypt.licenseheader" />
   </ItemGroup>
   <ItemGroup>
     <ClInclude Include="src\crypt.h" />
+    <ClInclude Include="src\dyninput.h" />
   </ItemGroup>
   <PropertyGroup Label="Globals">
     <VCProjectVersion>16.0</VCProjectVersion>
diff --git a/caesarcrypt.vcxproj.filters b/caesarcrypt.vcxproj.filters
index c52380a..64627fc 100644
--- a/caesarcrypt.vcxproj.filters
+++ b/caesarcrypt.vcxproj.filters
@@ -21,6 +21,9 @@
     <ClCompile Include="src\crypt.c">
       <Filter>Source Files</Filter>
     </ClCompile>
+    <ClCompile Include="src\dyninput.c">
+      <Filter>Source Files</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <None Include="caesarcrypt.licenseheader" />
@@ -29,5 +32,8 @@
     <ClInclude Include="src\crypt.h">
       <Filter>Header Files</Filter>
     </ClInclude>
+    <ClInclude Include="src\dyninput.h">
+      <Filter>Source Files</Filter>
+    </ClInclude>
   </ItemGroup>
 </Project>
\ No newline at end of file
diff --git a/src/caesarcrypt.c b/src/caesarcrypt.c
index b2e6c65..1fb2713 100644
--- a/src/caesarcrypt.c
+++ b/src/caesarcrypt.c
@@ -9,6 +9,7 @@
 */
 
 #include "crypt.h"
+#include "dyninput.h"
 
 #include <stdio.h>
 #include <stdlib.h>
@@ -28,10 +29,11 @@ int main()
 	fgets(buf, 3, stdin);
 	int choice = strtol(buf, NULL, 10);
 	
-	char* msg = calloc(128, sizeof(char));
+	//char* msg = calloc(128, sizeof(char));
 
 	fputs("Enter your message text: ", stdout);
-	if (msg) fgets(msg, 128, stdin);
+	//if (msg) fgets(msg, 128, stdin);
+	char* msg = dyninput_str(INT64_MAX);
 
 	fputs("Enter your key (shift value): ", stdout);
 	fgets(buf, 4, stdin);
@@ -56,5 +58,7 @@ int main()
 		}
 	}
 
+	free(msg);
+	msg = NULL;
 	return 0;
 }
diff --git a/src/dyninput.c b/src/dyninput.c
new file mode 100644
index 0000000..bcb8b5e
--- /dev/null
+++ b/src/dyninput.c
@@ -0,0 +1,47 @@
+/*
+  * Filename: dyninput.c
+  * Authors(s): Roland (Roland@example.com)
+  * Description: Short description here
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+*/
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <stdio.h>
+
+
+char* dyninput_str(int_least64_t maxsize)
+{
+    char* str = malloc(3 * sizeof(char));
+    /*if (!str)
+        puts("Error allocating memory!");
+        return NULL;*/
+
+    int_least64_t size = 3, i = 0;
+    char c = 0;
+
+    do
+    {
+        c = getchar();
+        if (i + 2 == size)
+        {
+            char* tmp = realloc(str, size + 1);
+            if (!tmp)
+            {
+                puts("Error (re)allocating memory!");
+                return NULL;
+            }
+            str = tmp;
+            size++;
+        }
+
+        str[i] = c;
+        i++;
+    } while (c && c != '\n');
+    str[i] = '\0';
+
+    return str;
+}
diff --git a/src/dyninput.h b/src/dyninput.h
new file mode 100644
index 0000000..efdabc4
--- /dev/null
+++ b/src/dyninput.h
@@ -0,0 +1,16 @@
+/*
+  * Filename: dyninput.h
+  * Authors(s): Roland (r.weirhowell@gmail.com)
+  * Description: Header file for dyninput.c
+  *
+  * This Source Code Form is subject to the terms of the Mozilla Public
+  * License, v. 2.0. If a copy of the MPL was not distributed with this
+  * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+*/
+
+#pragma once
+
+#include <stdint.h>
+
+
+char* dyninput_str(int_least64_t maxsize);