static int read_debug_line(const char **outbuffer, void *cookie)
{
int pos = 0;
int escape_level = 0;
#if CONSOLE_ENABLE_HISTORY
uint history_cursor = start_history_cursor();
#endif
char *buffer = debug_buffer;
for (;;) {
/* loop until we get a char */
int c;
if ((c = getchar()) < 0)
continue;
// TRACEF("c = 0x%hhx\n", c);
if (escape_level == 0) {
switch (c) {
case '\r':
case '\n':
if (echo)
putchar('\n');
goto done;
case 0x7f: // backspace or delete
case 0x8:
if (pos > 0) {
pos--;
fputc('\b', stdout);
putchar(' ');
fputc('\b', stdout); // move to the left one
}
break;
case 0x1b: // escape
escape_level++;
break;
default:
buffer[pos++] = c;
if (echo)
putchar(c);
}
} else if (escape_level == 1) {
// inside an escape, look for '['
if (c == '[') {
escape_level++;
} else {
// we didn't get it, abort
escape_level = 0;
}
} else { // escape_level > 1
switch (c) {
case 67: // right arrow
buffer[pos++] = ' ';
if (echo)
putchar(' ');
break;
case 68: // left arrow
if (pos > 0) {
pos--;
if (echo) {
fputc('\b', stdout); // move to the left one
putchar(' ');
fputc('\b', stdout); // move to the left one
}
}
break;
#if CONSOLE_ENABLE_HISTORY
case 65: // up arrow -- previous history
case 66: // down arrow -- next history
// wipe out the current line
while (pos > 0) {
pos--;
if (echo) {
fputc('\b', stdout); // move to the left one
putchar(' ');
fputc('\b', stdout); // move to the left one
}
}
if (c == 65)
strlcpy(buffer, prev_history(&history_cursor), LINE_LEN);
else
strlcpy(buffer, next_history(&history_cursor), LINE_LEN);
pos = strlen(buffer);
if (echo)
fputs(buffer, stdout);
break;
#endif
default:
break;
}
escape_level = 0;
}
/* end of line. */
if (pos == (LINE_LEN - 1)) {
fputs("\nerror: line too long\n", stdout);
pos = 0;
goto done;
}
}
done:
// dprintf("returning pos %d\n", pos);
// null terminate
buffer[pos] = 0;
#if CONSOLE_ENABLE_HISTORY
// add to history
add_history(buffer);
#endif
// return a pointer to our buffer
*outbuffer = buffer;
return pos;
}
int main(int argc, char *argv[], char *envp[])
{
read_config(); //read the config file
char c; //reading one letter at time here
//building a command line which will eventually get parsed
line = (char *)malloc(sizeof(char) * 100);
memset(line,0,100);
char *cmd = (char *)malloc(sizeof(char) * 100); //the program (command w/o args)
char *printBuff = (char *)malloc(sizeof(char)*100); //a printing buffer (for use with raw tty)
//holder for history if stuff is typed, then history is used to go back to typed stuff
char *historyHold = (char *)malloc(sizeof(char)*100);
path = (char*)malloc(sizeof(char)*100);
fullPath = (char*)malloc(sizeof(char)*100);
memset(printBuff,0,100);
memset(historyHold,0,100);
memset(cmd,0,100);
signal(SIGINT, handle_sig); //register interrupt signal (for CTRL+C)
int promptLen; //making sure we dont backspace the prompt
int fromHistory = 0; //a type of check to see if our line is from history (not user typed)
if(fork() == 0) {
execve("/usr/bin/clear", argv, envp); //simply clear the screen
exit(1);
}
else {
wait(NULL); //wait to clear screen
}
get_path(); //gets the 2dir path for prompt
tty_raw_mode();//set terminal into raw mode
sprintf(printBuff,"%s:%s",path,PROMPT); //build print buff
promptLen = strlen(printBuff);
curPos = promptLen; //leave a space
write(1,printBuff,promptLen); //print initial prompt
memset(printBuff,0,100); //clear printBuff
clear_args(); //just get any initial crap out
/* MAIN LOOP */
while(1) {
read(0,&c,1); //read 1 character from stdin
if(((c >= 32) && c!=127) || c == 10) {
//here, we only want to process characters that are
//"readable" (or enter). special characters will be
//handled differently
tabPressNo = 0; //they didnt press tab
write(1,&c,1); //write char (echo is off for raw mode)
++curPos;
switch(c) {
case '\n': //end of the line (enter was pressed after input)
if(line[0] == '\0') {
//they didnt type anything
sprintf(printBuff,"%s:%s",path,PROMPT);
write(1,printBuff,promptLen);
}
else if(strcmp(line,"exit")==0) {
printf("\n"); //for niceness
quit_raw_mode(); //play nice and restore term state
return 0; //quit if they type "exit"
}
else { //prepare to actually process
strncat(line,"\0",1);
if(line[0] != '!') {
add_history(line); //add command to history
}
int pipe = 0;
int separ = check_separ(line);
if(!separ){
pipe = check_pipe(line);
}
if(!separ && !pipe){ //try to execute the command if there werent pipes or semicolons
parse_args(line); //build array of arguments
strcpy(cmd, args[0]); //cmd = program to run
execute(cmd);
clear_args(); //resets all arg array strings
}
c = '\0';
memset(cmd, 0, 100); //clear the cmd array
//reprint prompt
sprintf(printBuff,"%s:%s",path,PROMPT);
promptLen = strlen(printBuff);
curPos = promptLen;
write(1,printBuff,promptLen);
}
memset(line,0,100); //clear line array
memset(historyHold,0,100);//clear history hold
break;
default: strncat(line, &c, 1);//build the line
break;
}
}
else if(c == 8) {
//backspace pressed
if(curPos > promptLen) {
backspace(); //backspace until we reach prompt
line[strlen(line)-1] = 0; //thank god this finally works
--curPos;
}
}
else if(c == 27) {
//the user pressed some sort of
//escape sequence
char c1;
char c2;
read(0,&c1,1);
read(0,&c2,1);
//ok, we have the two parts of the
//escape sequence in c1 and c2
if(c1 == 91 && c2 == 65) {
//this is the escape for the up arrow
//which we want to use for history
//browsing
char *tmpLine;
tmpLine = prev_history();
if(tmpLine != 0) {
if(line[0] != '\0' && fromHistory==0) {
//store what user currently has typed (if anything)
memset(historyHold,0,100);
strncpy(historyHold,line,strlen(line));
}
clear_line(strlen(line)); //clears whatever is at the prompt
memset(line,0,100);
strncpy(line,tmpLine,strlen(tmpLine)); //copy this command
free(tmpLine); //play nice
write(1,line,strlen(line)); //write old command
fromHistory = 1; //current line has been replaced by history
curPos = strlen(line) + promptLen; //so we know where are
}
}
else if(c1 == 91 && c2 == 66) {
//this is the escape for the down arrow
//which should make us go "forward"
//in history (if we are back in it)
char *tmpLine;
tmpLine = next_history(); //get the next history
if(tmpLine != 0) {
//next_history gave us a line
clear_line(strlen(line)); //clear old line from screen
memset(line,0,100); //clear old line in mem
strncpy(line,tmpLine,strlen(tmpLine)); //copy new line to old line
write(1,line,strlen(line)); //write new line to screen
curPos = strlen(line) + promptLen; //update pos
free(tmpLine);
}
else if(historyHold[0] != '\0') {
//if we dont have a next_line, lets see if
//we had some buffer before browsing history
clear_line(strlen(line));
memset(line,0,100);
strncpy(line,historyHold,strlen(historyHold));
write(1,line,strlen(line));
curPos = strlen(line) +promptLen;
fromHistory = 0; //back to user typed
}
else {
//it was blank before history was browsed
clear_line(strlen(line));
memset(line,0,100);
curPos = promptLen;
}
}
}
else if(c == '\t') {
//tab press. should i dare try to do tab
//completion? i guess...
//if this is the 2nd time in a row pressing tab
//they want a listing of everything that can be
//completed
if(tabPressNo) {
//print everything in tabHold
tabPressNo = 0;
if(tabCompHold[0] != NULL) {
int i = 1;
char *x = tabCompHold[0];
char *tmp = (char*)malloc(sizeof(char)*100);
memset(tmp,0,100);
write(1,"\n",1);
while(x != NULL) {
sprintf(tmp,"%s\t",x);
write(1,tmp,strlen(tmp));
memset(tmp,0,100);
x = tabCompHold[i];
++i;
}
write(1,"\n",1);
//reprint prompt
sprintf(printBuff,"%s:%s",path,PROMPT);
promptLen = strlen(printBuff);
curPos = promptLen + strlen(line);
write(1,printBuff,promptLen);
//write the line again
write(1,line,strlen(line));
clear_tab_hold();
}
} else {
//otherwise just let tab_complete
//print a single completion
char *tabcomp;
tabcomp = tab_complete(line);
if(tabcomp != NULL) {
//tab comp found a single thing, so
//lets just complete it
int i = 1;
char c = tabcomp[0];
while(c!='\0') {
write(1,&c,1);
strncat(line,&c,1);
c = tabcomp[i];
++i;
}
curPos += strlen(tabcomp); //set our new position
free(tabcomp);
}
++tabPressNo;
}
}
else if(c == '\177') {
//other form of backspace
if(curPos > promptLen) {
backspace(); //backspace until we reach prompt
line[strlen(line)-1] = 0; //thank god this finally works
--curPos;
}
}
memset(printBuff,0,100); //clear printing buffer
}
printf("\n"); //for niceness
quit_raw_mode(); //so we dont get stuck in it
return 0; //goodbye
}
