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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* env.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: cacharle <marvin@42.fr> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/02/28 09:21:24 by cacharle #+# #+# */
/* Updated: 2020/06/18 14:33:26 by charles ### ########.fr */
/* */
/* ************************************************************************** */
/*
** \file env.c
** \brief Environment manipulation
*/
#include "minishell.h"
#define ENV_VEC_DEFAULT_SIZE 64
/*
** \brief Convert array of string to environment hash table
** \param envp array of string (each in the format `name=value`)
** \return Environment hash table or NULL on error
*/
t_env env_from_array(char **envp)
{
t_env env;
if ((env = ft_vecnew(ENV_VEC_DEFAULT_SIZE)) == NULL)
return (NULL);
while (*envp != NULL)
{
if (ft_vecpush_safe(env, ft_strdup(*envp)) == NULL)
{
ft_vecdestroy(env, free);
return (NULL);
}
envp++;
}
return (ft_vecpush(env, NULL));
}
int env_keycmp(char *var, char *key)
{
size_t key_len;
key_len = ft_strlen(key);
if (ft_strncmp(var, key, key_len) == 0
&& ft_strlen(var) > key_len
&& var[key_len] == '=')
return (0);
return (1);
}
/**
** \brief Search a key in environment
** \param env Search environment
** \param key Searched key
** \return Value after '=' in environment variable array or NULL if not found
*/
char *env_search(t_env env, char *key)
{
size_t i;
i = 0;
while (i < env->size - 1)
{
if (env_keycmp(env->data[i], key) == 0)
return (ft_strchr(env->data[i], '=') + 1);
i++;
}
return (NULL);
}
char *env_search_first_match(t_env env, const char *haystack)
{
size_t len;
size_t i;
size_t key_len;
if (ft_isdigit(*haystack))
return (NULL);
len = 0;
while (ft_isalnum(haystack[len]) || haystack[len] == '_')
len++;
if (len == 0)
return (NULL);
i = -1;
while (++i < env->size - 1)
{
key_len = ft_strchr(env->data[i], '=') - (char*)env->data[i];
if (len != key_len)
continue ;
if (ft_strncmp((char*)env->data[i], haystack, len) == 0)
return (ft_strchr(env->data[i], '=') + 1);
}
return (NULL);
}
char *env_export(t_env env, char *key, char *value)
{
char *joined;
size_t i;
if ((joined = ft_strjoin3(key, "=", value)) == NULL)
return (NULL);
if (env_search(env, key) == NULL)
{
if (ft_vecinsert(env, env->size - 1, joined) == NULL)
return (NULL);
}
else
{
i = 0;
while (i < env->size - 1)
{
if (env_keycmp(env->data[i], key) == 0)
{
free(env->data[i]);
env->data[i] = joined;
break;
}
i++;
}
}
return (joined);
}
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