setenv.c

/*
** EPITECH PROJECT, 2025
** B-PSU-200-LYN-2-1-minishell1-pierre.baud
** File description:
** setenv
*/

#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include "my.h"

int is_valid_name(char *name)
{
    int i = 0;

    if (name == NULL || name[0] == '\0') {
        write(2, "setenv: Nom de variable invalide\n", 32);
        return 0;
    }
    for (; name[i] != '\0'; i++) {
        if (name[i] == '=') {
            write(2, "setenv: Le nom ne peut pas contenir '='\n", 39);
            return 0;
        }
    }
    return 1;
}

int find_index_var(char *name, char **envc)
{
    int name_len = my_strlen(name);
    int i = 0;

    for (; envc[i] != NULL; i++) {
        if (my_strncmp(envc[i], name, name_len) == 0 &&
            envc[i][name_len] == '=') {
            return i;
        }
    }
    return -1;
}

void update_var(int index, char *name, char *value, char **envc)
{
    int name_len = my_strlen(name);
    int value_len = my_strlen(value);
    int total_len = name_len + value_len + 2;
    char *new_entry = malloc(total_len * sizeof(char));

    if (new_entry == NULL) {
        write(2, "Erreur d'allocation mémoire\n", 29);
        exit(84);
    }
    my_strcpy(new_entry, name);
    my_strcat(new_entry, "=");
    my_strcat(new_entry, value);
    envc[index] = new_entry;
}

int my_setenv(char *name, char *value, char ***envc)
{
    int index;

    if (!is_valid_name(name))
        return 1;
    if (value == NULL)
        value = "";
    index = find_index_var(name, *envc);
    if (index != -1) {
        update_var(index, name, value, *envc);
    } else {
        add_new_var(name, value, envc);
    }
    return 0;
}