auth system

#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <windows.h>

#define _CRT_SECURE_NO_WARNINGS
#define D_CRT_NONSTDC_NO_WARNINGS

void logger(FILE*, int, char*);

char* dynstring(char);


int main() {
    FILE *fth = fopen("C:\\Users\\Timur\\Desktop\\logins.txt", "r");
    if (fth == NULL) {
        //error
        return 0;
    }
    char rights = 0;
    printf("-----------Authorizathion-----------\n");
    printf("Enter your login: ");
    char *login = dynstring('\n');
    printf("\nEnter your password: ");
    char *password = dynstring('\n');
    char temp = '0';
    while (temp != EOF) {
        int i = 0;
        for (; (temp = fgetc(fth)) != ';' && login[i] != '\0' && login[i] == temp; ++i);
        if (login[i] == '\0' && temp == ';') {
            i = 0;
            for (; (temp = fgetc(fth)) != ';' && password[i] != '\0' && password[i] == temp; ++i);
            if (password[i] == '\0' && temp == ';') {
                rights = (fgetc(fth) - '0') << 1;
                fgetc(fth);
                rights += fgetc(fth) - '0';
                //printf("\nrights: %d ", rights);
                break;
            } else {
                //error_code(4)
            }
        } else {
            while ((temp = fgetc(fth)) != '\n' && temp != EOF);
        }
    }
    if (!rights) {
        return 22;
    } else {printf("\nGOD");}
    // rights in template
    fclose(fth);
    return 0;
}


/*
int word_length (char ch) {
    int length = 0;
    char buf;
    for(; (buf!=getchar()) != ch; ++length);
    return length;
} // ch - our separator symbol

char* dynstring (char ch) {
    int length = word_length(ch);
    char* word = (char*)malloc((length+1) * sizeof(char));
    for(int i=0;i<length+1;++i){
        freopen();
    }

}
 */



char* dynstring(char c) {
    int l = 0;
    int size = 1;
    char *string = (char*) malloc(size * sizeof(char));
    char ch = getchar();
    while (ch != c) {
        string[(l)++] = ch;
        if (l >= size) {
            size *= 2;
            string = (char*) realloc(string, size * sizeof(char));
        }
        ch = getchar();
    }
    string[l] = '\0';
    return string;
}

char* timeinf();

void logger_book(FILE* fth, int code, char* login){
    char* time = timeinf();
    fprintf(fth, "{\t\"time\" = %s\";\t\"login\" = \"%s\";\t\"operation\" = \"", time,login);
    switch (code) {
        case 0:  fputs("Entered in the library\"}",fth);  break; //Auth accepted
        case 1:  fputs("Add book to the library \"}",fth); break;
        case 2:  fputs("Delete's book from the library\"}",fth); break;
        case 3:  fputs("Edit's book in library\"}",fth); break;
        case 4:  fputs("Lists books\"}",fth); break;
        case 5:  fputs("Search books by author surname\"}",fth); break;
        case 6:  fputs("Change count of books by ISBN\"}",fth); break;
        case 7:  fputs("Backups the library\"}",fth); break;
        case 8:  fputs("Open library backup\"}",fth); break;
        case 9:  fputs("Exit from library\"}",fth); break;
        case 10: fputs("Get book from library\"}",fth); break;
        case 11: fputs("Bring book in library\"}",fth); break;
        default:break;
    }
    fprintf(fth, "\"\n");
    free(time);
}


void logger_student(FILE* fth, int code, char* login){
    char* time = timeinf();
    fprintf(fth, "{\t\"time\" = %s\";\t\"login\" = \"%s\";\t\"operation\" = \"", time,login);
    switch (code) {
        case 0:  fputs("Entered in the student database\"}",fth);  break; //Auth accepted
        case 1:  fputs("Add student in database \"}",fth); break;
        case 2:  fputs("Delete's student from database\"}",fth); break;
        case 3:  fputs("Edit's information about student in database\"}",fth); break;
        case 4:  fputs("Lists student by number of student book\"}",fth); break;
        case 5:  fputs("Search students by surname\"}",fth); break;
        case 6:  fputs("Backups the library\"}",fth); break;
        case 7:  fputs("Open library backup\"}",fth); break;
        case 8:  fputs("Exit from student database\"}",fth); break;
        default:break;
    }
    fprintf(fth, "\"\n");
    free(time);
}



//fputs("\entered in the library"\n}",fth); break;

// CH_CODES

// Enter into the library !!! *done*
// Add's book to the library
// Delete's book from the library
// Edit's book in library
// Lists books
// Search books by author surname
// Change count of books by ISBN
// Backups the library
// Open library backup
// Exit from library
// Get book from library
// Bring book in library


char* timeinf(){
    const time_t timer = time(NULL) + 3600*3;
    char* tm =(char*)malloc(20*sizeof(char));
    struct tm* timeinf = localtime(&timer);
    strftime (tm,20,"%d.%m.%Y %X.",timeinf);
    //printf("%s\n",buffer);
    return tm;
}

//fprintf(fth, "%s\n", tm);