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/* sh - the standard command language interpreter
* Copyright (C) 2022 Ferass EL HAFIDI
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/* 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
#warning "This shell implementation is really buggy and incomplete. \
Please don't use this as a /bin/sh replacement."
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, i = 1;
FILE *file;
char param[256];
struct sigaction signal_action;
signal_action.sa_handler = SIG_IGN;
sigemptyset(&signal_action.sa_mask);
for (; i <= 256; i++) param[i] = 0;
while ((argument = getopt(argc, argv, "c")) != -1) {
if (argument == '?') {
printUsage();
return 1;
}
param[(uint8_t)argument] = argument;
}
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;
}
/* USAGE
* -----
* commandLoop()
*
* DESCRIPTION
* -----------
* This function is the actual command prompt.
*/
void commandLoop(FILE *filstr) {
struct sigaction signal_action;
char *prompt = getenv("PS1");
char *path = getenv("PATH");
char *token, *tokenstate;
char *command[4096];
pid_t isparent;
char name[4096], tempstr[4096];
int return_code;
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);
}
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