97 lines
2.7 KiB
C
97 lines
2.7 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: 2021/12/21 22:41:14 by lperrey ### ########.fr */
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/* */
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/* ************************************************************************** */
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#include "minishell.h"
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static int change_var_value(char *arg, char *var_name);
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#define ERR_ID 1
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#define ERR_ID_STR ": not a valid identifier"
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#define CMD "builtin_export"
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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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int exit_value;
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int ret;
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(void)argc;
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exit_value = EXIT_SUCCESS;
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i = 1;
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while (argv[i])
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{
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ret = export_var(argv[i]);
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if (ret == -1)
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return (ft_reti_perror(EXIT_FAILURE, CMD", export_var()"));
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else if (ret == ERR_ID)
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exit_value = 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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i++;
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}
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return (exit_value);
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}
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// in complete shell, must mark arguments for export
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// (Not implemented in minishell)
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// arg == var_name[=value]
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// return "-1" on alloc error
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int export_var(char *arg)
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{
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char **var_split;
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int ret;
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if (arg[0] != '_' && !ft_isalpha(arg[0]))
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return (shell_error("export: ", arg, ERR_ID_STR, ERR_ID));
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var_split = ft_split(arg, '=');
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if (!var_split)
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return (-1);
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if (!ft_is_posix_name(var_split[0]))
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{
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shell_error("export: ", var_split[0], ERR_ID_STR, 0);
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ft_free_2d_arr(var_split);
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return (ERR_ID);
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}
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ret = 0;
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if (ft_strchr(arg, '='))
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ret = change_var_value(arg, var_split[0]);
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ft_free_2d_arr(var_split);
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return (ret);
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}
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static int change_var_value(char *arg, char *var_name)
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{
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int env_position;
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char *tmp;
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env_position = ft_getenv_position(var_name);
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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, CMD", ft_resize_2d_arr()"));
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}
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tmp = ft_strdup(arg);
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if (!tmp)
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return (ft_reti_perror(-1, CMD", ft_strdup()"));
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free(environ[env_position]);
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environ[env_position] = tmp;
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return (EXIT_SUCCESS);
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}
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/*
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environment variables must be POSIX NAME :
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3.235 Name
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https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap03.html
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#tag_03_235
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*/
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