New module for functions I no longer need to work on

lib.(h|c) basically has structures and functions I no longer want to
stare at in main.c

lib.c

@@ -0,0 +1,57 @@
+/* lib.c
+ * Created: 2023-09-02
+ * Author: Aryadev Chavali
+ * Description: General functions used throughout
+ */
+
+#include <string.h>
+
+#include "./lib.h"
+
+buffer_t *buffer_init_str(const char *name, const char *str, size_t str_size)
+{
+  buffer_t *buf = malloc(sizeof(*buf) + str_size + 1);
+  buf->name     = name;
+  buf->size     = str_size;
+  memcpy(buf->data, str, str_size);
+  buf->data[str_size] = '\0';
+  return buf;
+}
+
+void print_error(const char *handle, size_t row, size_t column,
+                 const char *reason)
+{
+  fprintf(stderr, "%s:%lu:%lu:%s\n", handle, row, column, reason);
+}
+
+char *fread_all(FILE *fp)
+{
+  const size_t CHUNK_SIZE = 1024, MULT = 2;
+  struct
+  {
+    char *data;
+    size_t used, available;
+  } buffer = {calloc(CHUNK_SIZE, sizeof(*buffer.data)), 0, CHUNK_SIZE};
+
+  size_t acc = 0, bytes_read = 0;
+  while ((bytes_read = fread(buffer.data + acc, sizeof(*buffer.data),
+                             CHUNK_SIZE, fp)) != 0)
+  {
+    buffer.used += bytes_read;
+    acc += bytes_read;
+    if (buffer.used + CHUNK_SIZE >= buffer.available)
+    {
+      buffer.available = MAX(buffer.available * MULT, buffer.used + CHUNK_SIZE);
+      buffer.data      = realloc(buffer.data, buffer.available);
+    }
+  }
+  buffer.data              = realloc(buffer.data, buffer.used + 1);
+  buffer.data[buffer.used] = '\0';
+  return buffer.data;
+}
+
+bool usable_character(char c)
+{
+  return c == '>' || c == '<' || c == '+' || c == '-' || c == '-' || c == '.' ||
+         c == ',' || c == '[' || c == ']';
+}