setenv_functions.c

#include "holberton.h"

/**
 * add_value - create a new environment variable string
 * @key: variable name
 * @value: variable value
 *
 * Return: pointer to the new string;
 */

char *add_value(char *key, char *value)
{
	unsigned int len1, len2, i, j;
	char *new;

	len1 = _strlen(key);
	len2 = _strlen(value);
	new = malloc(sizeof(char) * (len1 + len2 + 2));
	if (new == NULL)
		return (NULL);
	for (i = 0; key[i] != '\0'; i++)
		new[i] = key[i];
	new[i] = '=';
	for (j = 0; value[j] != '\0'; j++)
		new[i + 1 + j] = value[j];
	new[i + 1 + j] = '\0';
	return (new);
}

/**
 * find_key - finds an environment variable
 * @env: array of environment variables
 * @key: environment variable to find
 *
 * Return: pointer to address of the environment variable
 */

char **find_key(char **env, char *key)
{
	unsigned int i, j, len;

	len = _strlen(key);
	for (i = 0; env[i] != NULL; i++)
	{
		for (j = 0; j < len; j++)
		{
			if (key[j] != env[i][j])
				break;
		}
		if (j == len && env[i][j] == '=')
			return (&env[i]);
	}
	return (NULL);
}

/**
 * add_key - create a new environment variable
 * @vars: pointer to struct of variables
 *
 * Return: void
 */
void add_key(vars_t *vars)
{
	unsigned int i;
	char **newenv;

	for (i = 0; vars->env[i] != NULL; i++)
		;
	newenv = malloc(sizeof(char *) * (i + 2));
	if (newenv == NULL)
	{
		prints_error_msg(vars, NULL);
		vars->status = 127;
		new_exit(vars);
	}
	for (i = 0; vars->env[i] != NULL; i++)
		newenv[i] = vars->env[i];
	newenv[i] = add_value(vars->array_tokens[1], vars->array_tokens[2]);
	if (newenv[i] == NULL)
	{
		prints_error_msg(vars, NULL);
		free(vars->buffer);
		free(vars->commands);
		free(vars->array_tokens);
		free_env(vars->env);
		free(newenv);
		exit(127);
	}
	newenv[i + 1] = NULL;
	free(vars->env);
	vars->env = newenv;
}