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https://gitlab.os-k.eu/os-k-team/os-k.git
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307 lines
9.2 KiB
C
307 lines
9.2 KiB
C
//----------------------------------------------------------------------------//
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// OS on Kaleid //
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// //
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// Desc: Kernel shell //
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// //
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// //
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// Copyright © 2018-2021 The OS/K Team //
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// //
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// This file is part of OS/K. //
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// //
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// OS/K is free software: you can redistribute it and/or modify //
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// it under the terms of the GNU General Public License as published by //
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// the Free Software Foundation, either version 3 of the License, or //
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// any later version. //
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// //
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// OS/K is distributed in the hope that it will be useful, //
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// but WITHOUT ANY WARRANTY//without even the implied warranty of //
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
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// GNU General Public License for more details. //
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// //
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// You should have received a copy of the GNU General Public License //
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// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
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//----------------------------------------------------------------------------//
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#include <io/vga.h>
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#include <io/keyb.h>
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#include <io/spkr.h>
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#include <libbuf.h>
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#include <sh/argv.h>
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#include <sh/shell.h>
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#include <po/shtdwn.h>
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#include <io/cursor.h>
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int shargc = 0;
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char **shargv = 0;
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int shcol = VGA_COLOR_LIGHT_GREY;
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char *shprompt = "shell> ";
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size_t shpromptlen = 7;
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static char *argvbuf = 0;
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void ExecuteCommand(char *cmdbuf, Command_t *cmdtable)
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{
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error_t rc;
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Command_t *cmd;
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bool found = false;
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if (!cmdbuf || !*cmdbuf)
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return;
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memzero(*shargv, ARG_MAX);
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rc = ShCmdLineToArgVec(cmdbuf, &shargc, argvbuf);
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if (rc) KeStartPanic("Shell: Couldn't parse command line: %d", rc);
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for (cmd = cmdtable; cmd->name != NULL; cmd++) {
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if (!strcmp(cmd->name, shargv[0])) {
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cmd->func(shargc, shargv, cmdbuf);
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found = true;
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break;
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}
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}
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assert(shargv[0] == argvbuf + ARG_MAX);
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if (found == false) {
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KernLog("err: command not found: '%.255s' (%ld)\n",
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shargv[0], strlen(shargv[0]));
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}
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}
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#define CMDBUFSIZE (BStdOut->lineLen - shpromptlen - 2)
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void ShStartShell(void)
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{
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uchar ch;
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error_t rc;
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char *ptr; // temp
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// Current line - beginning & current pos
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char *cmdbuf = malloc(CMDBUFSIZE);
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char *bufptr = cmdbuf;
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char *bufend = cmdbuf;
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// History...
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// We use a basic N-entries command history
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#define N 10 // must be >1
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char *history = malloc(CMDBUFSIZE * N);
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int historyIndex = 0;
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int historyScroll = 0;
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bool insertMode = 0;
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size_t nLines;
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argvbuf = malloc(ARG_MAX * 2);
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memzero(argvbuf, ARG_MAX * 2);
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shargv = (char **)argvbuf;
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shprompt = malloc(SHPROMPT_MAXLEN);
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strcpy(shprompt, "shell> ");
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shpromptlen = 7;
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KernLog("\n%C%s%C", VGA_COLOR_WHITE, shprompt, shcol);
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BFlushBuf(BStdOut);
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while ((rc = BGetFromBuf(BStdIn, &ch)) == EOK || rc == EENDF) {
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// Reset BStdIn's content
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if (rc == EENDF) {
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if (!(BStdIn->flags & BF_ERR)) {
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*bufptr = 0;
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bufptr = cmdbuf;
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ExecuteCommand(cmdbuf, shcmdtable);
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memzero(cmdbuf, CMDBUFSIZE);
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BFlushBuf(BStdIn);
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KernLog("%C%s%C", VGA_COLOR_WHITE, shprompt, shcol);
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BFlushBuf(BStdOut);
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}
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else break;
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}
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switch (ch) {
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// Backspace character
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case K_BACKSPACE:
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if (bufptr == cmdbuf)
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break;
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memmove(bufptr-1, bufptr, bufend-bufptr+1);
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bufptr--;
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bufend--;
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goto print_current_line;
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// DEL character
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case K_DEL:
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if (bufptr == bufend)
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break;
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memmove(bufptr, bufptr+1, bufend-bufptr+1);
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IoSetCursorOffset(IoGetCursorOffset()+1);
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bufend--;
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goto print_current_line;
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case K_BELL: IoDoBeep(); break;
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case K_ESCAPE: PoShutdown(); break;
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case K_PAGE_UP: IoScrollUp(); break;
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case K_PAGE_DOWN: IoScrollDown(); break;
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case K_INSERT:
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insertMode = 1 - insertMode;
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break;
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// Move within buffer
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case K_ARRW_LEFT:
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if (!(bufptr > cmdbuf))
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break;
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bufptr--;
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IoSetCursorOffset(IoGetCursorOffset()-1);
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BFlushBuf(BStdOut);
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break;
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case K_ARRW_RIGHT:
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if (bufptr == bufend)
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break;
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bufptr++;
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IoSetCursorOffset(IoGetCursorOffset()+1);
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BFlushBuf(BStdOut);
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break;
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case K_HOME:
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if (bufptr == cmdbuf)
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break;
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IoSetCursorOffset(IoGetCursorOffset()-(int)(bufptr-cmdbuf));
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bufptr = cmdbuf;
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BFlushBuf(BStdOut);
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break;
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case K_END:
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if (bufptr == bufend)
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break;
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IoSetCursorOffset(IoGetCursorOffset()+(int)(bufend-bufptr));
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bufptr = bufend;
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BFlushBuf(BStdOut);
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break;
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// Handle history scroll up/down
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case K_ARRW_UP:
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case K_ARRW_DOWN:
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if (historyIndex == 0)
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break; // No history yet
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if (ch == K_ARRW_UP) {
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memmove(cmdbuf, &history[historyScroll*CMDBUFSIZE], CMDBUFSIZE);
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if (historyScroll > 0)
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historyScroll--;
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}
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else if (historyScroll < historyIndex-1) {
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historyScroll++;
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memmove(cmdbuf, &history[historyScroll*CMDBUFSIZE], CMDBUFSIZE);
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}
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else
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break;
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for (bufend = cmdbuf; *bufend && bufend < cmdbuf+CMDBUFSIZE; bufend++);
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bufptr = bufend;
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IoSetCursorOffset(0);
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goto print_current_line;
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// Regular character
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default:
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if (bufptr >= bufend) {
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*bufptr++ = (char)ch;
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bufend = bufptr;
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*bufptr = 0;
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// Advance cursor
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if (IoGetCursorOffset() < 0)
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IoSetCursorOffset(IoGetCursorOffset() + 1);
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}
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else {
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if (!insertMode) {
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*++bufend = 0;
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for (ptr = bufend-1; ptr != bufptr; ptr--)
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*ptr = *(ptr - 1);
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}
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else { // insertMode
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// Advance cursor
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if (IoGetCursorOffset() < 0)
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IoSetCursorOffset(IoGetCursorOffset() + 1);
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}
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*bufptr++ = (char)ch;
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}
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print_current_line:
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BLockBuf(BStdOut);
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BStdOut->wp -= BStdOut->lastLF;
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BStdOut->size -= BStdOut->lastLF;
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BStdOut->lastLF = 0;
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bprintf(BStdOut, "%C%s%C%s",
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VGA_COLOR_WHITE, shprompt, shcol, cmdbuf);
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BUnlockBuf(BStdOut);
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IoSetScroll(1);
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IoScrollDown(); // This calls the flusher
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// End of buffer?
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if (bufend != cmdbuf+CMDBUFSIZE-1) {
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break; // No
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}
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// Else, *FALLTHROUGH* to case '\n'
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case '\n':
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BPutOnBuf(BStdOut, '\n');
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while (IoGetScroll() > 0) {
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IoScrollDown();
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}
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IoSetCursorOffset(0);
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bufptr = cmdbuf; // Reset bufptr
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bufend = cmdbuf;
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if (cmdbuf[0] && !isspace(cmdbuf[0])) {
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// Forget old commands
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if (historyIndex >= N) {
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assert(historyIndex == N);
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memmove(history, history+CMDBUFSIZE, CMDBUFSIZE * (N-1));
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historyIndex = historyScroll = N-1;
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}
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// Update history
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memmove(&history[historyIndex*CMDBUFSIZE], cmdbuf, CMDBUFSIZE);
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historyScroll = historyIndex;
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historyIndex++;
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// Execute & reset
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ExecuteCommand(cmdbuf, shcmdtable);
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memzero(cmdbuf, CMDBUFSIZE);
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}
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KernLog("%C%s%C", VGA_COLOR_WHITE, shprompt, shcol);
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BFlushBuf(BStdIn);
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BFlushBuf(BStdOut);
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break;
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}
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KePauseCPU();
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}
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}
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