getenv.c

#include "alxse.h"

/**
 * _getenviron - function that returns the strn arr copy of our env
 * @info: Structure containing potential args.
 * Used to maintain constant function prototype.
 * Return: Always (0)
 */

char **_getenviron(pinfo_t *info)
{
if (!info->environ || info->env_changed)
{
	info->environ = list_to_strings(info->env);
	info->env_changed = 0;
}

return (info->environ);
}

/**
 * _unsetenv - Remove an environment variable
 * @info: Structure containing potential arguments. Used to maintain
 *        constant function prototype.
 *  Return: 1 on delete, 0 otherwise
 * @var: the string env var property
 */

int _unsetenv(pinfo_t *info, char *var)
{
list_t *node = info->env;
size_t j = 0;
char *p;

if (!node || !var)
	return (0);

while (node)
{
	p = starts_with(node->str, var);
	if (p && *p == '=')
	{
		info->env_changed = delete_node_at_index(&(info->env), j);
		j = 0;
		node = info->env;
		continue;
	}
	node = node->nxt;
	j++;
}
return (info->env_changed);
}

/**
 * _setenv - function to initialize a new environment variable,
 * or modify an existing one
 * @info: Structure containing potential arguments.
 * Used to maintain constant function prototype.
 * @var: the strn env var property
 * @value: the string env var value
 *  Return: Always (0)
 */

int _setenv(pinfo_t *info, char *var, char *value)
{
char *buf = NULL;
list_t *node;
char *p;

if (!var || !value)
	return (0);

buf = malloc(_strlen(var) + _strlen(value) + 2);
if (!buf)
	return (1);
_strcpy(buf, var);
_strcat(buf, "=");
_strcat(buf, value);
node = info->env;
while (node)
{
	p = starts_with(node->str, var);
	if (p && *p == '=')
	{
		free(node->str);
		node->str = buf;
		info->env_changed = 1;
		return (0);
	}
	node = node->nxt;
}
add_node_end(&(info->env), buf, 0);
free(buf);
info->env_changed = 1;
return (0);
}