refactor a couple things

src/assembler/program.c

@@ -0,0 +1,95 @@
+#include "program.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+
+Program newProgram(void) {
+    Program program = {
+        .at = malloc(sizeof(Instruction) * 16),
+        .len = 0,
+        .capacity = 16,
+        .labels = {
+            .at = malloc(sizeof(Instruction) * 16),
+            .len = 0,
+            .capacity = 16,
+        }
+    };
+
+    if (program.at == NULL || program.labels.at == NULL) {
+        fprintf(stderr, "malloc failed while creating new program\n");
+        exit(1);
+    }
+    return program;
+}
+
+void addInstructionToProgram(Program* program, Instruction inst) {
+    if (program->at == NULL) {
+        fprintf(stderr, "unexpected NULL value when adding instruction to program\n");
+        exit(1);
+    }
+
+    if (program->len + 1 >= program->capacity) {
+        Instruction* tmp = malloc(sizeof(Instruction) * program->capacity * 2);
+        if (tmp == NULL) {
+            fprintf(stderr, "malloc failed while expanding program\n");
+            exit(1);
+        }
+        program->at = tmp;
+        program->capacity *= 2;
+    }
+
+    program->at[program->len] = inst;
+    program->len++;
+}
+
+void addLabelToProgram(Program* program, const char* name, uint8_t position) {
+    if (program->labels.at == NULL) {
+        fprintf(stderr, "unexpected NULL value when adding label to program\n");
+        exit(1);
+    }
+
+    if (program->labels.len + 1 >= program->labels.capacity) {
+        Label* tmp = malloc(sizeof(Label) * program->labels.capacity * 2);
+        if (tmp == NULL) {
+            fprintf(stderr, "malloc failed while expanding program labels\n");
+            exit(1);
+        }
+        program->labels.at = tmp;
+        program->labels.capacity *= 2;
+    }
+
+    char* nameCopy = malloc(strlen(name) + 1);
+    if (nameCopy == NULL) {
+        fprintf(stderr, "malloc failed while expanding program labels\n");
+        exit(1);
+    }
+
+    strcpy(nameCopy, name);
+
+    program->labels.at[program->labels.len] = (Label) {
+        .name = nameCopy,
+        .position = position
+    };
+    program->labels.len++;
+}
+
+void freeProgram(Program* program) {
+    if (program->at != NULL) {
+        free(program->at);
+    }
+    program->at = NULL;
+    program->capacity = 0;
+    program->len = 0;
+
+    if (program->labels.at != NULL) {
+        for (size_t i = 0; i < program->labels.len; i++) {
+            free(program->labels.at[i].name);
+        }
+        free(program->labels.at);
+    }
+    program->labels.at = NULL;
+    program->labels.capacity = 0;
+    program->labels.len = 0;
+}
+