I am novice to C programming and I have written a code to a requirement specification but I am consistently getting Segmentation Fault and unable to proceed ahead.
If the file name is 'code.c' and it runs with an error of not passing the argument (filename). But if the filename is passed, we land in Segmentation Fault.
Any help/suggestions will be appreciated.

```
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <string.h>

struct _data 
{               
   char *firstName;
   char *lastName;
   long number;
}; 

// SCAN FILE
int SCAN(FILE *(*stream))
{
    *stream = fopen("inputFile.data", "r");

    int ch = 0, lines = 0;

    while (!feof(*stream))
    {
        ch = fgetc(*stream);
        if (ch == '\n')
        {
            lines++;
        }
    }
    return lines;
}

// LOAD FILE
struct _data *LOAD(FILE *stream, int size) 
{
    int i;
    size_t chrCount;
    char *text, *number, *firstName, *lastName;
    struct _data *BlackBox;

    if ((BlackBox = (struct _data*)calloc(size, sizeof(struct _data))) == NULL) 
    {
          printf("ERROR - Could not allocate memory.\n");
          exit(0);
    }

    rewind(stream);

    for (i = 0; i < size; i++) 
    {
        getline(&text, &chrCount, stream);
        firstName   = strtok(text, " ");
        lastName    = strtok(text, " ");
        number      = strtok(NULL, "\n");

        // Allocate memory for name part of struct.
        if ((BlackBox[i].firstName = (char*)calloc(strlen(firstName), sizeof(char))) == NULL) 
        {
           printf("ERROR - Could not allocate memory.\n");
           exit(0);
        }
        if ((BlackBox[i].lastName = (char*)calloc(strlen(lastName), sizeof(char))) == NULL)
        {
           printf("ERROR - Could not allocate memory.\n");
           exit(0);
        }

        strcpy(BlackBox[i].firstName, firstName);
        strcpy(BlackBox[i].lastName, lastName);
        BlackBox[i].number = atol(number);
    }
    fclose(stream);
    return BlackBox;
}

void SEARCH(struct _data *BlackBox, char *name, int size, int inputs) 
{
    int i;
    int found = 0;
    char *search = " ";
    char *firstName;
    char *lastName; 

    if (inputs == 2)
    {
        firstName = strtok(name, search);
        lastName = strtok(NULL, search);
    }

    printf("*******************************************\n");
    if (inputs == 2)
    {   
        for (i = 0; i < size; i++) 
        {          
            if (!strcasecmp(firstName, BlackBox[i].firstName) && !strcasecmp(firstName, BlackBox[i].firstName))
            {
                printf("The name was found at the %d entry.\n", i);
                found = 1;
                break;
            }
        }
    }
    else
    {
        for (i = 0; i < size; i++) 
        {          
            if (!strcasecmp(firstName, BlackBox[i].firstName) || !strcasecmp(firstName, BlackBox[i].firstName))
            {
                printf("The name was found at the %d entry.\n", i);
                found = 1;
                break;
            }
        }
    }

    if (found == 0) 
    {
          printf("The name was NOT found.\n");
    }
    printf("*******************************************\n");
}

// FREE MEMORY
void FREE(struct _data *BlackBox, int size) 
{
    int i;
    for (i = 0; i < size; i++) 
    {
        free(BlackBox[i].firstName);
        free(BlackBox[i].lastName);
    } 
    free(BlackBox);
    BlackBox = NULL;
}

// MAIN
int main(int argv, char **argc) 
{
    int size;
    FILE *stream;
    struct _data *BlackBox;

    // argv == 1 WORKS, Below message is printed.
    if (argv == 1) 
    {          
        printf("*******************************************\n");
        printf("* You must include a name to search for.  *\n");
        printf("*******************************************\n");
    }
    // argv == 2 DOES NOT WORK, Segmentation Fault.     
    if (argv == 2) 
    {
        size = SCAN (&stream);
        BlackBox = LOAD(stream, size);
        SEARCH(BlackBox, argc[1], size, 1);
    }
    if (argv == 3) 
    {
        size = SCAN(&stream);
        BlackBox = LOAD(stream, size);
        SEARCH(BlackBox, argc[2], size, 2);
    }
    return 0;
}

```