Тема 6 - Задатак 2

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

#define MAX_INDEX (11 + 1)
#define MAX_IME (20 + 1)
#define MAX_PREZIME (30 + 1)

typedef struct student_st{
    char br_indexa[MAX_INDEX];
    char ime[MAX_IME];
    char prezime[MAX_PREZIME];
    unsigned int oc1;
    unsigned int oc2;
    unsigned int oc3;
    unsigned int oc4;
    double prosek;
    struct student_st *sl;
} STUDENT;

FILE* safe_open(char*,char*);
void list_init(STUDENT**);
STUDENT *napravi_cvor(char*,char*,char*,unsigned,unsigned,unsigned,unsigned);
void dodaj_na_kraj(STUDENT**,STUDENT*);
void ucitaj(FILE*,STUDENT**);
void free_st(STUDENT**);
void ispisi(FILE*,STUDENT*);
void nadji(char*,STUDENT*);

int main(int argc, char **argv){
    FILE *s_file;
    STUDENT *glava;
    list_init(&glava);
    if(argc != 4){
        printf("Nepravilan broj argumenata.");
    }else{
        s_file = fopen(argv[1],"r");
        ucitaj(s_file,&glava);
        fclose(s_file);
        s_file = safe_open(argv[2],"w");
        ispisi(s_file,glava);
        fclose(s_file);
        nadji(argv[3],glava);
        free_st(&glava);
    }
    return 0;
}

FILE* safe_open(char* file,char* mode){
    FILE* f = fopen(file,mode);
    if(f == NULL){
        printf("Doslo je do greske.");
        exit(EXIT_FAILURE);
    }
    return f;
}

void list_init(STUDENT **glava){
    *glava = NULL;
}

STUDENT *napravi_cvor(char* br_i,char* ime,char* prezime,unsigned o1,unsigned o2,unsigned o3,unsigned o4){
    STUDENT *novi = (STUDENT*)malloc(sizeof(STUDENT));
    if(novi == NULL){
        printf("nema dosta memorije.");
        exit(EXIT_FAILURE);
    }
    strcpy(novi->br_indexa,br_i);
    strcpy(novi->ime,ime);
    strcpy(novi->prezime,prezime);
    novi->oc1 = o1;
    novi->oc2 = o2;
    novi->oc3 = o3;
    novi->oc4 = o4;
    novi->prosek = (o1+o2+o3+o4)/4.;
    novi->sl = NULL;
    return novi;
}

void dodaj_na_kraj(STUDENT** glava,STUDENT* st){
    if(*glava == NULL){
        *glava = st;
    }else{
        STUDENT *t = *glava;
        while(t->sl != NULL){
            t = t->sl;
        }
        t->sl = st;
    }
}

void ucitaj(FILE* f,STUDENT **glava){
    char br[MAX_INDEX],
         ime[MAX_IME],
         prezime[MAX_PREZIME];
    int o1,
        o2,
        o3,
        o4;
    while(fscanf(f,"%s %s %s %u %u %u %d",
                                        br,
                                        ime,
                                        prezime,
                                        &o1,
                                        &o2,
                                        &o3,
                                        &o4) != EOF){
        dodaj_na_kraj(glava,napravi_cvor(br,ime,prezime,o1,o2,o3,o4));
    }
}

void free_st(STUDENT** glava){
    STUDENT *tmp;
    while(*glava != NULL){
        tmp = *glava;
        *glava = (*glava)->sl;
        tmp->sl = NULL;
        free(tmp);
    }
}

void ispisi(FILE* f,STUDENT* glava){
    STUDENT *t = glava;
    while(t != NULL){
        fprintf(f,"%s %s %s %u %u %u %u %.2lf\n",t->br_indexa,t->ime,t->prezime,t->oc1,t->oc2,t->oc3,t->oc4,t->prosek);
        t = t->sl;
    }
}

void nadji(char* indeks,STUDENT* glava){
    STUDENT *t = glava;
    while(t != NULL){
        if(strcmp(indeks,t->br_indexa) == 0){
            printf("Student %s %s ima prosek %.2lf.",t->ime,t->prezime,t->prosek);
            return;
        }
        t = t->sl;
    }
    printf("Ne postoji student sa zadatim brojem indeksa.");
}