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#include <init/shell.h>
#include <init/stdlib.h>
#include <shared/syscalls.h>
#define PROMPT "$ "
static int tty_fd = 0; // TODO put in stdlib
static char *split(char *base) {
while (*base) {
if (*base == ' ' || *base == '\t') {
*base++ = '\0';
return base;
}
base++;
}
return NULL;
}
static int readline(char *buf, size_t max) {
char c;
size_t pos = 0;
while (_syscall_read(tty_fd, &c, 1, 0)) {
switch (c) {
case '\b':
case 0x7f:
/* for some reason backspace outputs 0x7f (DEL) */
if (pos != 0) {
printf("\b \b");
pos--;
}
break;
case '\r':
printf("\n");
buf[pos++] = '\0';
return pos;
default:
if (pos < max) {
_syscall_write(tty_fd, &c, 1, 0);
buf[pos] = c;
pos++;
}
}
}
return -1; // error
}
void shell_loop(void) {
static char cmd[256];
char *args;
for (;;) {
printf(PROMPT);
readline(cmd, 256);
args = split(cmd);
printf(" %s | %s\n", cmd, args);
}
}
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