Added some guard clauses and additional checks when allocating memory.

tstring.c

@@ -1,4 +1,5 @@
 #include "tstring.h"
+#include <string.h>
 
 int GetGlyphByteWidth(const char* glyph);
 void TStringCopyGlyph(const char* glyph, int length, TString* string);
@@ -13,8 +14,22 @@ struct __tstring {
 TString* TStringCreate(void) {
     TString* string = malloc(sizeof(TString));
 
+    if (!string) {
+        fprintf(stderr, "Failed to malloc space for TString. %s.\n", strerror(errno));
+
+        return NULL;
+    }
+
     string->Characters = calloc(DEFAULT_TSTRING_BYTE_BUFFER, sizeof(char));
 
+    if (!string->Characters) {
+        fprintf(stderr, "Failed to malloc space for TString character array. %s.\n", strerror(errno));
+
+        free(string);
+
+        return NULL;
+    }
+
     string->Capacity = DEFAULT_TSTRING_BYTE_BUFFER;
     string->ByteCount = 0;
     string->Length = 0;
@@ -29,6 +44,8 @@ int TStringLength(const TString* string) {
 }
 
 void TStringAppendText(const char* text, TString* string) {
+    if (!text || !string) return;
+
     int totalLength = strlen(text);
     int glyphLength = GetGlyphByteWidth(text);
 
@@ -94,12 +111,7 @@ void TStringFree(TString* string) {
 }
 
 int GetGlyphByteWidth(const char* glyph) {
-    // printf("Bytes for '%s': ", glyph);
-    
-    // for(size_t i = 0; i < strlen(glyph); i++) {
-    //     printf("%02X ", 0xFF & glyph[i]);
-    // }
-    // printf("\n");
+    if (!glyph) return -1;
 
     if ((*glyph & 0x80) == 0) {
         return 1;
@@ -118,6 +130,7 @@ int GetGlyphByteWidth(const char* glyph) {
 }
 
 void TStringCopyGlyph(const char* glyph, int length, TString* string) {
+    if (!glyph || !string) return;
     if (length < 1) return;
 
     if (string->ByteCount + length > string->Capacity) {