1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
|
/* SPDX-License-Identifier: BSD-3-Clause */
/*
* Copyright (C) 2022, 2023 Ferass El Hafidi <vitali64pmemail@protonmail.com>
*/
/* Here's the POSIX specification of sh: */
/* https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html */
/* Define feature test macro. It doesn't compile with gcc without that for
* some reason.
*/
#define _POSIX_C_SOURCE 200809L
/* POSIX Header files */
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <errno.h>
#include <stdint.h>
#include <sys/wait.h>
#include <spawn.h>
#include <libgen.h>
#include <signal.h>
/* Our own header files */
#include "parser.h"
#include "version.h"
#ifndef COMPILETIME
#define COMPILETIME
#endif
void commandLoop();
int getopt(int argc, char *const argv[], const char *optstring);
char *pathSearch(const char *path, const char *name);
void printUsage();
int main(int argc, char *const argv[]) {
int argument;
FILE *file;
struct sigaction signal_action;
signal_action.sa_handler = SIG_IGN;
sigemptyset(&signal_action.sa_mask);
while ((argument = getopt(argc, argv, "c")) != -1) {
if (argument == '?') {
printUsage();
return 1;
}
}
argc -= optind;
argv += optind;
sigaction(SIGINT, &signal_action, NULL);
if (errno) return errno;
if (argv[0]) {
file = fopen(argv[0], "r");
if (errno) return errno;
commandLoop(file);
}
else commandLoop(stdin);
return 0;
}
/* This function is the actual command prompt.
* It basically enters in a for(;;) loop where it reads the user's input.
* When the input is NULL, it exits.
*/
void commandLoop(FILE *filstr) {
char *prompt = getenv("PS1");
char *token, *tokenstate;
char *command[4096];
char name[4096], tempstr[4096];
int command_argc;
if (prompt == NULL) prompt = "$ ";
for (;;) {
for (int i = 0; i <= 4096; i++) {
name[i] = 0; /* (Re)Initialise name and command,
* very important. */
command[i] = 0;
}
setvbuf(stdout, NULL, _IONBF, 0);
if (filstr == stdin && isatty(STDIN_FILENO)) printf(prompt);
if (fgets(name, 4096, filstr) == NULL)
break;
//read(fildes, name, 4096);
if (!strcmp(name, "\n"))
continue;
else if (*name == 0 || *name == EOF) {
putchar('\n');
break;
}
name[strlen(name) - 1] = 0;
strcpy(tempstr, name); /* We don't want to override `name`. */
if (strtok(tempstr, ";") != NULL && strtok(NULL, ";") != NULL) {
/* Hacky wacky hack. */
strcpy(tempstr, name);
token = strtok_r(tempstr, ";", &tokenstate);
for (; token != NULL;) {
command_argc = splitCommand(token, command); /* See parser.c */
parseCommand(command_argc, command); /* See parser.c */
token = strtok_r(NULL, ";", &tokenstate);
}
}
else {
command_argc = splitCommand(name, command); /* See parser.c */
parseCommand(command_argc, command); /* See parser.c */
}
}
}
void printUsage() {
printf("Ferass' Base System. (%s)\n\n"
"Usage: sh [-c command_string]\n\n"
"The standard command language interpreter.\n\n"
"\t-c command_string\tExecute command_string and exit.\n", COMPILETIME);
}
|
