readssss

#include <stdio.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
char ** rf(int f)
{
    char **student_grades=(char**)malloc(sizeof(char*)*2);
    int n_count=1;
    char buffer[1000];
    int bytes_read;
    int k = 0;
    char chr;
    *(student_grades+0)=(char*)malloc(sizeof(char*)*11);
    while((bytes_read=read(f,&chr,1))>0)
    {
        // bytes_read = read(f, &chr, 1);
        buffer[k++]=chr;
        if(chr == '\n' || chr == '\0')
        {
            buffer[k]='\0';
            *(student_grades+n_count)=(char*)malloc(sizeof(char)*(strlen(buffer)+1));
            strcpy(student_grades[n_count++],buffer);
            student_grades=(char**)realloc(student_grades, (n_count+1)*sizeof(char*));
            sprintf(*(student_grades+0), "%d", n_count);
            memset(buffer,0,k);
            k = 0;
        }
    }
    return student_grades;
}
int * s_grades(char * s)
{
    char * sng=(char*)malloc(sizeof(char)*(strlen(s)+1));
    strcpy(sng,s);
    char * pch;
    int *numbers=(int*) malloc(sizeof(int)*2);
    char n_count=1;
    char *splitted_sng;
    splitted_sng=(char*)malloc(sizeof(char)*(strlen(sng)+1));
    pch = strtok (sng," ,abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ\n");
    while (pch != NULL)
    {
        numbers[n_count++]=atoi(pch);
        numbers=(int*)realloc(numbers, (n_count+1)*sizeof(int));
        numbers[0]=n_count;
        pch = strtok (NULL, " ,abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ\n");
    }
    return numbers;
}
char * s_name(char * s)
{
    char * sng=(char*)malloc(sizeof(char)*(strlen(s)+1));
    strcpy(sng,s);
    char * pch;
    char *splitted_sng;
    int n;
    splitted_sng=(char*)malloc(sizeof(char)*(strlen(sng)+1));
    pch = strtok (sng," ,0123456789\n");
    while (pch != NULL)
    {
        strcat(splitted_sng,pch);
        n=strlen(splitted_sng);
        if(pch = strtok (NULL, " ,0123456879\n"))
        {
            splitted_sng[n]=' ';
            splitted_sng[n+1]='\0';
        }
        //pch = strtok (NULL, " ,0123456879\n");
    }
    return splitted_sng;
}
double avr(int * n)
{
    int i;
    int sum=0;
    for(i=1; i<*(n+0); i++)
        sum+=*(n+i);
    return sum*1.0/((*(n+0)-1)*1.0);
}
int myCompare (const void * a, const void * b )
{
    const char **ia = (const char **)a;
    const char **ib = (const char **)b;
    return strcmp(*ia, *ib);
}
int main(int argc, char** argv)
{
    if(argc!=2)
    {
        printf("Enter one argument which is the name of the file\n");
        return 0;
    }
    char *buf;
    int bytesRead;
    int fp;
    //printf("%s\n",argv[1]);
    fp=open(argv[1], O_RDONLY);
    char **students=rf(fp);
    int i,pid2,n;
    printf("Students are: \n");
    n=atoi(students[0]);
    for(i=1; i<n; i++)
        printf("%s",*(students+i));
    //printf("%d\n",n);
    int pid=fork();
    if(pid==0)
    {
        printf("avrs:\n");
        for(i=1; i<n; i++)
            printf("%s avr %f\n",s_name(*(students+i)),avr(s_grades(*(students+i))));
    }
    else
    {
        pid2=fork();
        if(pid2==0)
        {
            printf("Ordered:\n");
            qsort(students+1,n-1,sizeof(char*),myCompare);
            int j;
            for(j=1; j<n; j++)
                printf("Ord %d: %s",j,*(students+j));
        }
    }
    close(fp);
    return 0;
}