Types, allocators and better code split.

jh_io.h

@@ -0,0 +1,85 @@
+/* jh_io.h - v0.01 - Jason Hilder
+
+Heavily inspired and designed from:
+* https://github.com/nothings/stb/
+* https://github.com/gingerBill/gb/
+
+This is a single header file that contains:
+- useful/common I/O helpers
+
+To use this library, do this in *one* C:
+	#define JH_IO_IMPLEMENTATION
+	#include "jh_io.h"
+*/
+
+#ifndef JH_IO_INCLUDED
+#define JH_IO_INCLUDED
+
+int jh_read_file_to_buffer(char* file_path, char** out_buffer, int add_terminator);
+
+// -------------------------------------- 
+// -------------------------------------- 
+// implementation Below
+// -------------------------------------- 
+
+#ifdef JH_IO_IMPLEMENTATION
+
+// -------------------------------------- 
+// FILE I/O helpers:
+// -------------------------------------- 
+
+// Takes file path and a buffer which will get reallocated to the full file size. 
+// Note: buffer still needs to be manually free'd
+int jh_read_file_to_buffer(char* file_path, char** out_buffer, int add_terminator)
+{
+    FILE *file = fopen(file_path, "rb");
+    if(file == NULL)
+    {
+        perror("Failed to open file.");
+        return -1;
+    }
+
+    fseek(file, 0L, SEEK_END);
+    long file_size = ftell(file);
+    if (file_size == -1)
+    {
+        perror("Failed to determine file size");
+        fclose(file);
+        return -1;
+    }
+    rewind(file);
+
+    // Reallocate memory for the buffer, check if realloc is successful
+    // Realloc with extra space if terminator is needed
+    char *buffer = realloc(*out_buffer, file_size + (add_terminator ? 1 : 0));
+    if (buffer == NULL)
+    {
+        perror("Memory allocation failed");
+        fclose(file);
+        return -1;
+    }
+
+    // Update the pointer to the newly allocated buffer
+    *out_buffer = buffer; 
+
+    size_t bytes_read = fread(*out_buffer, 1, file_size, file);
+    if (bytes_read != file_size)
+    {
+        perror("Error reading file");
+        fclose(file);
+        return -1;
+    }
+
+    // Add null terminator if needed
+    if (add_terminator == 1)
+    {
+        (*out_buffer)[file_size] = '\0';
+    }
+
+    fclose(file);
+    return 0;
+}
+
+
+#endif
+#endif