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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* setup.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <me@cacharle.xyz> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/09/16 15:46:09 by charles #+# #+# */
/* Updated: 2020/10/10 13:49:11 by cacharle ### ########.fr */
/* */
/* ************************************************************************** */
#include "minishell.h"
/*
** \brief Export variable if not already in environment
** \param env Environment where to export
** \param key Key to check for export
** \param value Default value
** \return True if allocation succeded, false otherwise
*/
bool st_export_default(t_env env, char *key, char *value)
{
if (env_search(env, key, NULL) != NULL)
return (true);
return (env_export(env, key, value) != NULL);
}
/*
** \brief Setup the environment variables
** \param env Environment to setup
** \return true on success, false otherwise
*/
bool setup_env(t_env env)
{
char buf[PATH_MAX + 1];
if (!(getcwd(buf, PATH_MAX)))
return (false);
if (!st_export_default(env, "PWD", buf) ||
!st_export_default(env, "PATH", "/sbin:"))
return (false);
if (path_search(env, "env", buf, false) != 0)
ft_strcpy(buf, "/sbin/env");
env_export(env, "_", buf);
return (true);
}
/*
** \brief Increment the SHLVL variable
** \param env Environment where to set SHLVL
** \return true on success, false otherwise
*/
bool setup_shlvl(t_env env)
{
char shlvl_str[64];
char *shlvl_old;
int value;
char *end;
shlvl_old = env_search(env, "SHLVL", NULL);
if (shlvl_old == NULL)
shlvl_old = "0";
errno = 0;
value = (int)ft_strtol(shlvl_old, &end, 10);
if (errno != 0 || *end != '\0')
value = 0;
value++;
if (value < 0)
value = 0;
if (value > 1000)
{
errorf("warning: shell level (");
ft_putnbr_fd(value, STDERR_FILENO);
ft_putstr_fd(") too high, resetting to 1\n", STDERR_FILENO);
value = 1;
}
ft_itoa_cpy(shlvl_str, value);
return (env_export(env, "SHLVL", shlvl_str) != NULL);
}
/*
** \brief Initialize the progname global variable
** used in error messages
** \param first_arg argv[0] of minishell
*/
void setup_progname(char *first_arg)
{
char *last_slash;
if (first_arg == NULL)
return ;
last_slash = ft_strrchr(first_arg, '/');
if (last_slash == NULL)
g_state.progname = first_arg;
else
g_state.progname = last_slash + 1;
}
/*
** \brief Setup minishell (signals, env variables, progname)
** \param first_arg Used in setup_progname
** \param env Environment
** \return true on succes, false otherwise
*/
bool setup(char *first_arg, t_env env)
{
signal(SIGINT, signal_sigint);
signal(SIGQUIT, signal_sigquit);
signal(SIGTERM, signal_sigterm);
setup_progname(first_arg);
return (setup_env(env) && setup_shlvl(env));
}
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