lab

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <dirent.h>
#include <sys/types.h>

char *getString(){
    int size = 30;
    char *string = malloc(size * sizeof(char));
    char c;
    int i = 0;
    c = getchar();
    while(c != '\n'){
        if(i == size - 2){
            size += 30;
            string = realloc(string, size * sizeof(char));
        }
        string[i] = c;
        i++;
        c = getchar();
    }
    string[i] = '\0';
    return string;
}

void recDirent(char *nameDir, int size, char letter, FILE *output){
    DIR *dir = opendir(nameDir);
    struct dirent *cur = readdir(dir);
    if(dir){
        while(cur){
            if((cur->d_type == DT_DIR) && strcmp(cur->d_name, ".") && strcmp(cur->d_name, "..")){
                int length = strlen(nameDir);
                if(length + strlen(cur->d_name) == size - 1){
                    size += 100;
                    nameDir = realloc(nameDir, size * sizeof(char));
                }
                strcat(nameDir, cur->d_name);
                strcat(nameDir, "/");
                recDirent(nameDir, size, letter, output);
                nameDir[length] = '\0';
            }
            if(cur->d_type == DT_REG){
                if((cur->d_name[0] == letter) && (cur->d_name[1] == '.')){
                    fprintf(output, "%s%s\n", nameDir, cur->d_name);
                    break;
                }
            }
            cur = readdir(dir);
        }
    }
    closedir(dir);
}

int main(){
    char *string = getString();
    int size = 100;
    char *nameDir = malloc(size * sizeof(char));
    FILE *output;
    output = fopen("result.txt", "w");
    for(int i = 0; i < strlen(string); i++){
        nameDir[0] = '\0';
        strcat(nameDir, "./");
        recDirent(nameDir, size, string[i], output);
    }
    fclose(output);
    free(string);
    free(nameDir);
    return 0;
}