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/* ************************************************************************** */
/* */
/* ::: :::::::: */
/* redir.c :+: :+: :+: */
/* +:+ +:+ +:+ */
/* By: charles <charles.cabergs@gmail.com> +#+ +:+ +#+ */
/* +#+#+#+#+#+ +#+ */
/* Created: 2020/06/15 11:05:34 by charles #+# #+# */
/* Updated: 2020/10/15 10:28:23 by cacharle ### ########.fr */
/* */
/* ************************************************************************** */
#include "eval.h"
/*
** \brief Open a file and close the previous opened file
** if there was one already setup
** \param filename File to open
** \param fd File descriptor to set or replace
** \param oflag Flag passed to the open function
** \return 0 on success, the error status code otherwise
*/
static int st_open_replace(char *filename, int *fd, int oflag)
{
if (fd == NULL)
return (EVAL_FATAL);
if (*fd != FD_NONE)
close(*fd);
if (oflag & O_CREAT)
*fd = open(filename, oflag, 0644);
else
*fd = open(filename, oflag);
if (*fd == -1)
{
errorf("%s: %s\n", filename, strerror(errno));
free(filename);
return (1);
}
return (0);
}
/*
** \brief Call st_open_replace with different argument
** according to the redirection type
** \param filename Name of the file to open
** \param fds Input/output file descriptors
** \param tag Token tag of the redirection
** \return Whatever st_open_replace returns
*/
static int st_open_replace_dispatch(char *filename, int fds[2], enum e_tok tag)
{
int *fd;
int oflag;
fd = NULL;
oflag = 0;
if (tag == TAG_REDIR_IN)
{
fd = &fds[FD_READ];
oflag = O_RDONLY;
}
else if (tag == TAG_REDIR_OUT)
{
fd = &fds[FD_WRITE];
oflag = O_WRONLY | O_CREAT | O_TRUNC;
}
else if (tag == TAG_REDIR_APPEND)
{
fd = &fds[FD_WRITE];
oflag = O_WRONLY | O_CREAT | O_APPEND;
}
return (st_open_replace(filename, fd, oflag));
}
static int st_tok_lsts_destroy_ret(
int ret, t_tok_lst **tokens1, t_tok_lst **tokens2)
{
tok_lst_destroy(tokens1, free);
tok_lst_destroy(tokens2, free);
return (ret);
}
/*
** \brief Extract redirections from tokens
** \param redirs List of token of redirection, in the format
** redir token -> n sticked string token -> redir token -> ...
** \param env Environement need for interpolation of redirection filename
** \param fds Input/output file descriptor to setup
** \return 0 on success,
** the command evaluation error status code otherwise
*/
int redir_extract(t_tok_lst **redirs, t_env env, int fds[2])
{
t_tok_lst *after;
t_tok_lst *curr;
char *filename;
int status;
if (*redirs == NULL)
return (0);
curr = (*redirs)->next;
after = NULL;
while (curr != NULL && curr->tag & TAG_IS_STR)
{
if (curr->next == NULL || curr->next->tag & TAG_IS_REDIR)
{
after = curr->next;
curr->next = NULL;
}
curr = curr->next;
}
if ((status = preprocess_filename(&(*redirs)->next, env, &filename)))
return (st_tok_lsts_destroy_ret(status, redirs, &after));
if ((status = st_open_replace_dispatch(filename, fds, (*redirs)->tag)) != 0)
return (st_tok_lsts_destroy_ret(status, redirs, &after));
tok_lst_destroy(redirs, free);
free(filename);
return (redir_extract(&after, env, fds));
}
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