Commit bf73a988 authored by Seblu's avatar Seblu
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parent 30a57534

Makefile.am

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@@ -32,6 +32,7 @@ bin_PROGRAMS=42sh 
		src/exec/exec_node.c			\

		src/exec/exec_or.c			\

		src/exec/exec_if.c			\

		src/exec/exec_red.c			\

		src/exec/exec_sep.c			\

		src/exec/exec_sepand.c			\

		src/exec/exec_while.c			\

src/builtin/builtin.c

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/*

** builtin.c for 42sh

**

** Made by Seblu

** Login   <seblu@epita.fr>

**

** Started on  Tue Apr 11 00:22:44 2006 Seblu

** Last update Sun Nov 12 16:47:59 2006 Seblu

*/



#include <string.h>

#include <unistd.h>

#include <assert.h>

#include "builtin.h"

#include "../main/42sh.h"

#include "../ast/ast.h"

#include "../opt/opt.h"



#define BUILTIN_NUMBER 7

#define BUILTIN_BONUS_NUMBER 7



static const char *builtin_name[BUILTIN_NUMBER] =

  {

    "cd",

    "echo",

    "exit",

    "shopt",

    "source",

    "unset",

    "export"

  };



static const char *builtin_bonus_name[BUILTIN_BONUS_NUMBER] =

  {

    ".",

    "..",

    "set",

    "varlist",

    "funclist",

    "exec",

    "history"

  };



static const t_func_builtin builtin_function[BUILTIN_NUMBER] =

  {

    builtin_cd,

    builtin_echo,

    builtin_exit,

    builtin_shopt,

    builtin_source,

    builtin_unset,

    builtin_export

  };



static const t_func_builtin builtin_bonus_function[BUILTIN_BONUS_NUMBER] =

  {

    builtin_simpledot,

    builtin_doubledot,

    builtin_set,

    builtin_varlist,

    builtin_funclist,

    builtin_exec,

    builtin_history

  };



/*!

** test if a command is a builtin

**

** @param name The name of the command

** @return 1 if \a name is a builtin, else 0

*/

int		is_a_builtin(const char *name, struct s_42sh *sh)

{

  register int	i;



  for (i = 0; i < BUILTIN_NUMBER; ++i)

    if (!strcmp(name, builtin_name[i]))

      return 1;

  if (opt_isset("bonus", sh->opt))

    for (i = 0; i < BUILTIN_BONUS_NUMBER; ++i)

      if (!strcmp(name, builtin_bonus_name[i]))

	return 1;

  return 0;

}



/*!

** execute a shell builtin

**

** @param builtin_name The name of the builtin

** @param argv The builtin arguments, terminate by NULL, argv[0] = builtin_name

** @return The return value of the builtin

*/

int		exec_builtin(struct s_cmd *cmd, struct s_42sh *sh)

{

  register int	i;



  for (i = 0; i < BUILTIN_NUMBER; ++i)

    if (!strcmp(cmd->argv[0], builtin_name[i]))

      return builtin_function[i](cmd->argv, sh);

  if (opt_isset("bonus", sh->opt))

    for (i = 0; i < BUILTIN_BONUS_NUMBER; ++i)

      if (!strcmp(cmd->argv[0], builtin_bonus_name[i]))

	return builtin_bonus_function[i](cmd->argv, sh);

  return 0;

}

src/builtin/builtin.h

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Original line number Diff line number Diff line 
/*

** builtin.h for 42sh in /home/seblu/svn/42sh

**

** Made by Seblu

** Login   <seblu@epita.fr>

**

** Started on  Sun Nov 12 16:46:24 2006 Seblu

** Last update Sun Nov 12 16:47:03 2006 Seblu

*/



#ifndef BUILTIN_H_

# define BUILTIN_H_



struct s_42sh;

struct s_cmd;



typedef int (*t_func_builtin)(char *argv[], struct s_42sh *sh);



int	is_a_builtin(const char *name, struct s_42sh *sh);

int	exec_builtin(struct s_cmd *cmd, struct s_42sh *sh);



/*

** Regular builtin

*/

int	builtin_cd(char *argv[], struct s_42sh *sh);

int	builtin_echo(char *argv[], struct s_42sh *sh);

int	builtin_shopt(char *argv[], struct s_42sh *sh);

int	builtin_exit(char *argv[], struct s_42sh *sh);

int	builtin_source(char *argv[], struct s_42sh *sh);

int	builtin_unset(char *argv[], struct s_42sh *sh);

int	builtin_export(char *argv[], struct s_42sh *sh);



/*

** Bonus builtin

*/

int	builtin_simpledot(char *argv[], struct s_42sh *sh);

int	builtin_doubledot(char *argv[], struct s_42sh *sh);

int	builtin_set(char *argv[], struct s_42sh *sh);

int	builtin_varlist(char *argv[], struct s_42sh *sh);

int	builtin_funclist(char *argv[], struct s_42sh *sh);

int	builtin_exec(char *argv[], struct s_42sh *sh);

int	builtin_history(char *argv[], struct s_42sh *sh);



#endif /* ! BUILTIN_H_ */

src/builtin/builtin_cd.c

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/*

** builtin_cd.c for 42sh in /home/seblu/devel/c/42sh/src/execution

**

** Made by Seblu

** Login   <seblu@epita.fr>

**

** Started on  Tue Apr 11 00:23:47 2006 Seblu

** Last update Sun May 21 19:17:53 2006 Seblu

*/



#include <ctype.h>

#include <stdio.h>

#include <assert.h>

#include <errno.h>

#include <string.h>

#include <stdlib.h>

#include <unistd.h>

#include "../main/42sh.h"

#include "builtin.h"

#include "../var/var.h"



#include "mem.h"



static int cd_var(struct s_42sh *sh, const char *name);

static int cd_minus(struct s_42sh *sh);

static int secure_chdir(const char *path);



/*!

** Builtin cd.

** @param argv The tab of args: terminated by NULL, argv[0] = "cd"

** @param sh The 42sh structure

*/

int	builtin_cd(char **argv, struct s_42sh *sh)

{

  assert(sh && argv && argv[0]);



  if (!argv[1])

    return cd_var(sh, "HOME");

  if (!strcmp("-", argv[1]))

    return cd_minus(sh);

  return secure_chdir(argv[1]);

}



/*!

** Change directory to home directory

**

** @param sh shell env

** @param name env var

**

** @return exit status

*/

static int	cd_var(struct s_42sh *sh, const char *name)

{

  const char	*new_dir;



  if (!(new_dir = var_get(sh->vars, name)))

  {

    fprintf(stderr, "42sh: cd: %s not set\n", name);

    return 1;

  }

  return secure_chdir(new_dir);

}



/*!

** Return in previous directory

**

** @param sh shell info

**

** @return return status

*/

static int	cd_minus(struct s_42sh *sh)

{

  if (cd_var(sh, "OLDPWD"))

    return 1;

  return 0;

}



/*!

** Change of directory and on error, print good error.

**

** @param path new path

**

** @return error status with error code (0 is good)

*/

static int	secure_chdir(const char *path)

{

  const char	*errormsg = "";

  char		*tmp;



  errno = 0;

  if (chdir(path))

  {

    if (errno == ENOENT)

      errormsg = "No such file or directory";

    else if (errno == EACCES)

      errormsg = "Permission denied";

    else if (errno == ENAMETOOLONG)

      errormsg = "File name too long";

    else if (errno == ENOTDIR)

      errormsg = "Not a directory";

    else if (errno == ELOOP)

      errormsg = "Too many levels of symbolic links";

    else

      assert(0);

    fprintf(stderr, "42sh: cd %s: %s\n", path, errormsg);

    return 1;

  }

  if ((tmp = getenv("PWD")))

    var_setenv("OLDPWD", tmp, !0);

  var_setenv("PWD", (tmp = var_getcwd()), !0);

  free(tmp);

  return 0;

}

src/builtin/builtin_doubledot.c

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/*

** builtin_doubledot.c for 42sh in /home/seblu/devel/c/towork/42sh

**

** Made by Seblu

** Login   <seblu@epita.fr>

**

** Started on  Sat Apr  8 18:02:31 2006 Seblu

** Last update Sun Apr  9 12:38:38 2006 SIGOURE Benoit

*/



#include <stddef.h>

#include "builtin.h"



#include "mem.h"



/*!

** Builtin double dot, allow you to cdup

**

** @param argv argv vector

** @param sh sh data

**

** @return builtin return success

*/

int		builtin_doubledot(char *argv[], struct s_42sh *sh)

{

  char		*argv2[3];



  argv2[0] = "cd";

  argv2[1] = "..";

  argv2[2] = NULL;

  return builtin_cd(argv2, sh);

  argv = argv;

}