120 lines
3.0 KiB
C
120 lines
3.0 KiB
C
/* ************************************************************************** */
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/* */
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/* ::: :::::::: */
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/* export.c :+: :+: :+: */
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/* +:+ +:+ +:+ */
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/* By: lperrey <lperrey@student.42.fr> +#+ +:+ +#+ */
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/* +#+#+#+#+#+ +#+ */
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/* Created: 2021/12/03 13:36:54 by lperrey #+# #+# */
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/* Updated: 2021/12/04 18:47:15 by lperrey ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "minishell.h"
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char *ft_getenv(char *env_var);
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size_t ft_getenv_position(char *env_var);
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static int change_env_value(char *arg);
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// in complete shell, must mark arguments for export
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// (Not implemented in minishell)
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int builtin_export(int argc, char *argv[], t_all *c)
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{
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int i;
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(void)argc;
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i = 1;
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while (argv[i])
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{
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if (ft_strchr(argv[i], '='))
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{
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if (!change_env_value(argv[i]))
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return (EXIT_FAILURE);
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if (ft_strncmp(argv[i], "PATH=", 5) == 0)
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c->path = retrieve_path();
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}
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i++;
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}
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return (EXIT_SUCCESS);
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}
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static int change_env_value(char *arg)
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{
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char **var_split;
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int env_position;
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var_split = ft_split(arg, '=');
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if (!var_split)
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return (ft_reti_perror(-1, "builtin_export, ft_split()"));
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env_position = ft_getenv_position(var_split[0]);
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ft_free_2d_arr(var_split);
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if (environ[env_position] == NULL)
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{
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environ = ft_resize_2d_arr(environ, 1);
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if (!environ)
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return (ft_reti_perror(-1, "builtin_export, ft_resize_2d_arr()"));
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}
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environ[env_position] = ft_strdup(arg);
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if (!environ[env_position])
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return (ft_reti_perror(-1, "builtin_export, ft_strdup()"));
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return (0);
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}
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/*
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** Search for an environement variable,
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** and return a pointer to the first character after "env_var=" .
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** Return NULL if env_var not found.
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*/
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char *ft_getenv(char *env_var)
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{
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int i;
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char *tmp;
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size_t env_var_len;
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env_var_len = ft_strlen(env_var);
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i = 0;
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tmp = NULL;
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while (!tmp && environ[i])
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{
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if (environ[i][env_var_len] == '=')
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{
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if (ft_strncmp(environ[i], env_var, env_var_len) == 0)
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tmp = &environ[i][env_var_len + 1];
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else
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i++;
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}
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else
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i++;
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}
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return (tmp);
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}
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/*
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** Like ft_getenv(), but return position of env_var instead of value.
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** If env_var not found, return last position of **environ (== NULL)
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*/
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size_t ft_getenv_position(char *env_var)
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{
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int i;
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int found;
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size_t env_var_len;
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env_var_len = ft_strlen(env_var);
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i = 0;
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found = 0;
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while (!found && environ[i])
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{
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if (environ[i][env_var_len] == '=')
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{
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if (ft_strncmp(environ[i], env_var, env_var_len) == 0)
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found = 1;
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else
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i++;
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}
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else
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i++;
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}
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return (i);
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}
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