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#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "shell-builtin.h"
#include "xwrap.h"
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
const RasShellBuiltin ras_shell_builtins[] = {
{ "cd", ras_shell_builtin_cd },
{ "echo", ras_shell_builtin_echo },
{ "exit", ras_shell_builtin_exit },
{ "logout", ras_shell_builtin_logout },
{ "printenv", ras_shell_builtin_printenv },
{ "pwd", ras_shell_builtin_pwd },
{ "setenv", ras_shell_builtin_setenv },
{ "umask", ras_shell_builtin_umask },
{ NULL, NULL }
};
int ras_shell_builtin_cd (int argc, char* argv[], RasShell* shell) {
if (shell->attr_rshell) {
fprintf (stderr, "%s: you are not permitted to run this command\n", argv[0]);
return 1;
}
char* dest = argv[1];
if (dest == NULL) {
dest = getenv ("HOME");
if (dest == NULL) {
dest = ".";
}
}
if (chdir (dest) < 0) {
fprintf (stderr, "cd: %s: %s\n", dest, strerror (errno));
return 1;
}
return 0;
}
int ras_shell_builtin_echo (int argc, char* argv[], RasShell* shell) {
for (int i = 1; argv[i] != NULL; i++) {
if (i > 1) {
putchar (' ');
}
fputs (argv[i], stdout);
}
putchar ('\n');
return 0;
}
int ras_shell_builtin_exit (int argc, char* argv[], RasShell* shell) {
if (argc > 2) {
fprintf (stderr, "%s: too many arguments\n", argv[0]);
return 1;
}
if (argc < 2) {
shell->req_exit_status = 0;
} else if (sscanf (argv[1], "%d", &shell->req_exit_status) < 1) {
fprintf (stderr, "%s: `%s\' is not a number\n", argv[0], argv[1]);
return 1;
}
shell->req_exit = true;
return 0;
}
int ras_shell_builtin_logout (int argc, char* argv[], RasShell* shell) {
if (!shell->attr_login) {
fprintf (stderr, "%s: not a login shell\n", argv[0]);
return 1;
}
return ras_shell_builtin_exit (argc, argv, shell);
}
int ras_shell_builtin_printenv (int argc, char* argv[], RasShell* shell) {
if (argc > 2) {
fprintf (stderr, "%s: too many arguments\n", argv[0]);
return 1;
}
if (argc < 2) {
extern char** environ;
for (int i = 0; environ[i] != NULL; i++) {
puts (environ[i]);
}
} else {
char* res = getenv (argv[1]);
if (res == NULL) {
return 1;
}
puts (res);
}
return 0;
}
int ras_shell_builtin_pwd (int argc, char* argv[], RasShell* shell) {
char* cwd = xgetcwd ();
if (cwd == NULL) {
fprintf (stderr, "%s: cannot get working directory: %s\n", argv[0], strerror (errno));
return 1;
}
puts (cwd);
free (cwd);
return 0;
}
int ras_shell_builtin_setenv (int argc, char* argv[], RasShell* shell) {
if (argc != 3) {
fprintf (
stderr, "%s: too %s arguments\n", argv[0], argc > 3 ? "many" : "few");
return 1;
}
return - setenv (argv[1], argv[2], 1);
}
int ras_shell_builtin_umask (int argc, char* argv[], RasShell* shell) {
if (argc > 2) {
fprintf (stderr, "%s: too many arguments\n", argv[0]);
return 1;
}
if (argc < 2) {
mode_t old_mode = umask (0777);
umask (old_mode);
printf ("%04o\n", old_mode);
} else {
int mode_int;
if (sscanf (argv[1], "%o", &mode_int) < 0) {
fprintf (stderr, "%s: `%s\' is not a valid octal number\n", argv[0], argv[1]);
return 1;
}
mode_t new_mode = mode_int;
umask (new_mode);
}
return 0;
}
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