hanez/fun
1
0
Fork 0
forked from fun/fun
Code Pull requests Activity

Added input_hidden() to ask for passwords in the CLI without echoing the chars. (0.37.37)

Browse source
This commit is contained in:
Johannes Findeisen 2026-01-02 20:12:01 +01:00
commit b32f7e839b
7 changed files with 172 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

71
src/vm/io/input_line.c
View file

@ -1,6 +1,10 @@
case OP_INPUT_LINE: {
/* operand: 0 = no prompt; 1 = has prompt (string or any value convertible to string) */
int has_prompt = inst.operand ? 1 : 0;
/* operand bit flags:
* bit0 (1): has prompt (string or any value convertible to string) — top of stack holds prompt when set
* bit1 (2): hidden input (do not echo typed characters)
*/
int has_prompt = (inst.operand & 1) ? 1 : 0;
int hidden = (inst.operand & 2) ? 1 : 0;
if (has_prompt) {
/* pop prompt value and print without newline */
Value pv = pop_value(vm);
@ -13,6 +17,35 @@ case OP_INPUT_LINE: {
free_value(pv);
}
/* For hidden input, temporarily disable terminal echo if possible */
int echo_disabled = 0;
#ifdef _WIN32
if (hidden) {
HANDLE hStdin = GetStdHandle(STD_INPUT_HANDLE);
if (hStdin != INVALID_HANDLE_VALUE) {
DWORD mode;
if (GetConsoleMode(hStdin, &mode)) {
DWORD newMode = mode & ~(ENABLE_ECHO_INPUT);
if (SetConsoleMode(hStdin, newMode)) {
echo_disabled = 1;
}
}
}
}
#else
if (hidden) {
/* POSIX termios */
struct termios oldt;
if (tcgetattr(STDIN_FILENO, &oldt) == 0) {
struct termios newt = oldt;
newt.c_lflag &= ~(ECHO);
if (tcsetattr(STDIN_FILENO, TCSANOW, &newt) == 0) {
echo_disabled = 1;
}
}
}
#endif
/* read a line from stdin, dynamically grow buffer */
size_t cap = 128;
size_t len = 0;
@ -20,7 +53,8 @@ case OP_INPUT_LINE: {
if (!buf) {
fprintf(stderr, "Runtime error: out of memory reading input");
push_value(vm, make_string(""));
break;
/* On early exit, try to restore echo if we turned it off */
goto restore_echo_and_break;
}
int ch;
@ -68,5 +102,36 @@ case OP_INPUT_LINE: {
free(buf);
push_done:
/* If we disabled echo, restore terminal settings and print a newline for UX */
#ifdef _WIN32
if (echo_disabled) {
HANDLE hStdin = GetStdHandle(STD_INPUT_HANDLE);
if (hStdin != INVALID_HANDLE_VALUE) {
DWORD mode;
if (GetConsoleMode(hStdin, &mode)) {
/* Re-enable ECHO flag */
mode |= ENABLE_ECHO_INPUT;
SetConsoleMode(hStdin, mode);
}
}
if (has_prompt) {
fputc('\n', stdout);
fflush(stdout);
}
}
#else
if (echo_disabled) {
struct termios t;
if (tcgetattr(STDIN_FILENO, &t) == 0) {
t.c_lflag |= ECHO;
tcsetattr(STDIN_FILENO, TCSANOW, &t);
}
if (has_prompt) {
fputc('\n', stdout);
fflush(stdout);
}
}
#endif
restore_echo_and_break:
break;
}