Request_parser.c

#include "data_structure.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

// Function to parse the specific request file for a process [cite: 59, 61]
void parse_memory_requests(Process* p) {
    char filename[50];
    // Files are named per process: requests_1.txt, requests_2.txt
    sprintf(filename, "requests_%d.txt", p->processID);

    FILE* file = fopen(filename, "r");
    if (!file) {
        // If file doesn't exist, process has no memory requests
        p->requests_head = NULL;
        p->current_request = NULL;
        return; 
    }

    MemRequest* tail = NULL;
    p->requests_head = NULL;
    char buffer[100];
    
    // Read line by line
    while (fgets(buffer, sizeof(buffer), file)) {
        // Skip comments (#) or empty lines [cite: 76]
        if (buffer[0] == '#' || buffer[0] == '\n') continue;

        MemRequest* new_node = (MemRequest*) malloc(sizeof(MemRequest));
        char type_str[5];
        
        // Parse: Time, Address, Type
        int count = sscanf(buffer, "%d %d %s", 
                           &new_node->request_time, 
                           &new_node->virtual_addr, 
                           type_str);
        
        if (count < 3) { 
            free(new_node); 
            continue; 
        }

        new_node->type = type_str[0]; // 'r' or 'w'
        new_node->next = NULL;

        // Append to Linked List
        if (p->requests_head == NULL) {
            p->requests_head = new_node;
            tail = new_node;
        } else {
            tail->next = new_node;
            tail = new_node;
        }
    }
    
    // Set current pointer to start of list
    p->current_request = p->requests_head;
    fclose(file);
}