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/*
* Copyright (c) 2023-2025 Ian Marco Moffett and the Osmora Team.
* All rights reserved.
*
* 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 Hyra 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 OWNER 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.
*/
#include <sys/types.h>
#include <sys/cdefs.h>
#include <fcntl.h>
#include <stddef.h>
#include <unistd.h>
#include <string.h>
#define prcons(FD, STR) write((FD), (STR), strlen((STR)))
#define is_ascii(C) ((C) >= 0 && (C) <= 128)
#define WELCOME \
":::::::::::::::::::::::::::::::::::::::\n" \
":: OSMORA GATEWAY ~ Every key echos ::\n" \
":: ..... Proceed with purpose ..... ::\n" \
":::::::::::::::::::::::::::::::::::::::\n"
#define HELP \
"Default commands:\n" \
"help - Display this help message\n" \
"echo - Print the arguments to the console\n" \
"exit - Exit the shell\n"
#define PROMPT "[root::osmora]~ "
static char buf[64];
static uint8_t i;
static int running;
struct command {
const char *name;
void (*func)(int fd, int argc, char *argv[]);
};
void
cmd_help(int fd, int argc, char *argv[])
{
prcons(fd, HELP);
}
void
cmd_exit(int fd, int argc, char *argv[])
{
running = 0;
}
void
cmd_echo(int fd, int argc, char *argv[])
{
for (i = 1; i < argc; i++) {
prcons(fd, argv[i]);
prcons(fd, " ");
}
prcons(fd, "\n");
}
int
parse_args(char *input, char *argv[], int max_args)
{
int argc = 0;
while (*input != '\0') {
/* skip leading spaces */
while (*input == ' ') {
input++;
}
/* check if empty */
if (*input == '\0') {
break;
}
if (argc < max_args) {
argv[argc++] = input; /* mark start of the argument */
}
/* move forward until next space or end */
while (*input != '\0' && *input != ' ') {
input++;
}
/* end */
if (*input != '\0') {
*input = '\0';
input++;
}
}
return argc;
}
static char *
getstr(int fd)
{
char c;
uint8_t input;
i = 0;
for (;;) {
if (read(fd, &input, 2) <= 0) {
continue;
}
c = input & 0xFF;
/* return on newline */
if (c == '\n') {
buf[i] = '\0';
write(fd, "\n", 1);
return buf;
}
/* handle backspaces and DEL */
if (c == '\b' || c == 127) {
if (i > 0) {
i--;
write(fd, "\b \b", 3);
}
} else if (is_ascii(c) && i < sizeof(buf) - 1) {
/* write to fd and add to buffer */
buf[i++] = c;
write(fd, &c, 1);
}
}
}
struct command cmds[] = {
{"help", cmd_help},
{"echo", cmd_echo},
{"exit", cmd_exit},
{NULL, NULL}
};
int
main(void)
{
int fd, found, argc;
char *input, *argv[16];
char c;
if ((fd = open("/dev/console", O_RDWR)) < 0) {
return fd;
}
i = 0;
running = 1;
found = 0;
prcons(fd, WELCOME);
while (running) {
prcons(fd, PROMPT);
input = getstr(fd);
if (input[0] == '\0') {
continue;
}
argc = parse_args(input, argv, sizeof(argv));
if (argc == 0) {
continue;
}
for (i = 0; cmds[i].name != NULL; i++) {
if (strcmp(input, cmds[i].name) == 0) {
cmds[i].func(fd, argc, argv);
found = 1;
break;
}
}
if (found == 0) {
prcons(fd, "Unrecognized command\n");
}
found = 0;
buf[0] = '\0';
}
return 0;
}
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