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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* exec.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <charles.cabergs@gmail.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/04/01 17:06:11 by charles #+# #+# */
/* Updated: 2020/04/01 17:06:12 by charles ### ########.fr */
/* */
/* ************************************************************************** */
/*
** \file exec.c
** \brief Executable name and path
*/
#include "eval.h"
/*
** \brief Check if executable name is already a path
** \param exec_name Executable name
** \return True if valid
*/
bool exec_is_path(char *exec_name)
{
return (ft_strncmp(exec_name, "../", 3) == 0
|| ft_strncmp(exec_name, "./", 2) == 0
|| ft_strncmp(exec_name, "/", 1) == 0);
}
/*
** \brief Check if executable path is valid
** \param exec_path Executable path
** \return True if valid
*/
bool exec_is_valid(char *exec_path)
{
struct stat statbuf;
if (stat(exec_path, &statbuf) != 0)
return (false);
if (!S_ISREG(statbuf.st_mode)) // also need to manage link
return (false);
// could test permission but probably handled by execve
return (true);
}
/*
** \brief Search executable name in path
** \param path Path hash table
** \param path_var Path environment string in case we need to update path
** \param exec_name Executable name to search
** \return Executable path or NULL if not found or path update error
*/
char *exec_search_path(t_path path, char *path_var, char *exec_name)
{
char *exec_path;
if (exec_is_path(exec_name))
return (exec_name);
// try current first
if ((exec_path = ft_htget(path, exec_name)) == NULL)
{
if (path_update(path, path_var) == NULL) // optimise by not updating not changed path in ht
return (NULL);
if ((exec_path = ft_htget(path, exec_name)) == NULL)
return (NULL);
}
return (exec_path);
}
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