I’m trying to dynamic allocate a double pointer. I intend to call a function with parameter which are file name and a address of a pointer struct variable. And the function Opens a text file and dynamic allocate as a double pointer. Because I intend to return the double pointer struct variable so the pointer variable in main() can save the value which are read by file.

These are my codes:

// main.c
// Priority Scheduling Algorithm
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "Priority.h"

// Sort by Arrival Time
void Sort(Process process[], int numProcess) {
    Process temp;
    for (int i = 0; i < numProcess; i++) {
        for (int j = i + 1; j < numProcess; j++) {
            if (process[i].arrivalTime > process[j].arrivalTime) {
                temp = process[i];
                process[i] = process[j];
                process[j] = temp;
            }
        }
    }
}

int main() {
    Process* process = NULL;
    int numProcess = OpenFile("scheduling.txt", &process);

    // List of Process
    printf("inputn");
    printf("---------------------------------------------------------n");
    printf("Process IDt Arrival Timet Burst Timet Priorityn");
    printf("---------------------------------------------------------n");
    for (int i = 0; i < numProcess; i++) {
        printf("%2dtt %2dtt %2dtt %2dn", process[i].processID, process[i].arrivalTime, process[i].burstTime, process[i].priority);
    }

    // sort by Arrival Time
    Sort(process, numProcess);

    // Run scheduling algorithm
    SchedulingAlgorithm(process, numProcess);

    free(process);
    system("pause");
    return 0;
}

As you can see, I call the function with file name and a address of a pointer.

// FileOpen.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "Priority.h"

// File Open
int OpenFile(const char* filename, Process** process) {
    FILE* file;
    int line = 0;
    int i = 0;

    // File open
    if (fopen_s(&file, filename, "r") != 0) {
        printf("Failed to Open filen");
        return -1;
    }

    char bin[50];
    while (fgets(bin, sizeof(bin), file) != 0) {
        line++;
    }

    rewind(file);

    *process = (Process*)malloc(sizeof(Process) * (line + 1));
    if (*process == NULL) {
        fprintf(stderr, "Memory allocation failuren");
        return -1;
    }

    while (fscanf_s(file, "%s %d %d %d %d", bin, 20, &(*process)[i].processID, &(*process)[i].arrivalTime, &(*process)[i].burstTime, &(*process)[i].priority) != EOF) {
        i++;
    }


    fclose(file);
    return line;
}

And there is the C6385 Warning at this code:

while (fscanf_s(file, "%s %d %d %d %d", bin, 20, &(*process)[i].processID, &(*process)[i].arrivalTime, &(*process)[i].burstTime, &(*process)[i].priority) != EOF) {
        i++;
    }

I think this warning relates with memory allocation.

I have no idea why it does not work properly because it works in MacOs.