Added an option to read input from a file.

futil.c

@@ -0,0 +1,56 @@
+#include "futil.h"
+
+int ReadAllString(const char* path, char** content_ptr, size_t* bytes_read) {
+    if (!path || !content_ptr || !bytes_read) return 0;
+
+    FILE *file = fopen(path, "rb"); //Always open the file in binary mode.
+
+    if (!file) {
+        fprintf(stderr, "Failed to open '%s'. %s.\n", path, strerror(errno));
+        return 0;
+    }
+
+    char *content = NULL, *temp;
+    size_t used = 0, capacity = 0, read = 0; //Allows initialize stack allocated values to zero!
+
+    while(1) {
+        if (used + FUTIL_READ_SIZE + 1 > capacity) {
+            capacity = used + FUTIL_READ_SIZE + 1;
+
+            temp = realloc(content, capacity);
+
+            if (!temp) {
+                fprintf(stderr, "Failed to realloc space for file contents. %s.\n", strerror(errno));
+                free(content);
+                fclose(file);
+                return 0;
+            }
+
+            content = temp;
+        }
+
+        read = fread(content + used, 1, FUTIL_READ_SIZE, file);
+
+        if (read == 0) break;
+
+        used += read;
+    }
+
+    fclose(file);
+    //Shrink the buffer to fit just the contents of the buffer.
+    temp = realloc(content, used + 1);
+
+    if (!temp) {
+        fprintf(stderr, "Failed to realloc to only hold the file contents. %s.\n", strerror(errno));
+        free(content);
+        return 0;
+    }
+
+    content = temp;
+    content[used] = '\0';
+
+    *content_ptr = content;
+    *bytes_read = used;
+
+    return 1;
+}