From ff9e7fa2ce2e7ee2f1f09d436c796463e449363f Mon Sep 17 00:00:00 2001
From: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Date: Wed, 6 May 2009 20:39:23 +1000
Subject: libbb/lineedit: simple adaptation to support tab-completion in ash

this is far from perfect as a vt100 emulation, but enough to make
ash's tab completion work.
---
 libbb/lineedit.c | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)

diff --git a/libbb/lineedit.c b/libbb/lineedit.c
index b950d7f26..b349bc6f2 100644
--- a/libbb/lineedit.c
+++ b/libbb/lineedit.c
@@ -62,6 +62,25 @@
 
 static line_input_t *state;
 
+#ifdef __MINGW32__
+struct termios {
+	int c_lflag;
+	int c_cc[3];
+};
+#define safe_read(fd,buf,n) wincon_read(fd,buf,n)
+/* True value does not matter because it's emulated */
+#define ICANON	1
+#define ECHO	2
+#define ECHONL	4
+#define ISIG	8
+
+#define VMIN    0
+#define VTIME   1
+#define VINTR   2
+
+static int wincon_read(int fd, char *buf, int size);
+#endif
+
 static struct termios initial_settings, new_settings;
 
 static volatile unsigned cmdedit_termw = 80;        /* actual terminal width */
@@ -1208,10 +1227,15 @@ static void parse_prompt(const char *prmt_ptr)
 }
 #endif
 
+#ifdef __MINGW32__
+#define setTermSettings(fd, argp)
+#define getTermSettings(fd, argp) ((struct termios *)argp)->c_lflag = ECHO;
+#else
 #define setTermSettings(fd, argp) tcsetattr(fd, TCSANOW, argp)
 #define getTermSettings(fd, argp) tcgetattr(fd, argp);
 
 static sighandler_t previous_SIGWINCH_handler;
+#endif
 
 static void cmdedit_setwidth(unsigned w, int redraw_flg)
 {
@@ -1230,8 +1254,10 @@ static void win_changed(int nsig)
 	int width;
 	get_terminal_width_height(0, &width, NULL);
 	cmdedit_setwidth(width, nsig /* - just a yes/no flag */);
+#ifndef __MINGW32__
 	if (nsig == SIGWINCH)
 		signal(SIGWINCH, win_changed); /* rearm ourself */
+#endif
 }
 
 /*
@@ -1295,8 +1321,10 @@ int read_line_input(const char* prompt, char* command, int maxsize, line_input_t
 	new_settings.c_cc[VINTR] = _POSIX_VDISABLE;
 	setTermSettings(0, (void *) &new_settings);
 
+#ifndef __MINGW32__
 	/* Now initialize things */
 	previous_SIGWINCH_handler = signal(SIGWINCH, win_changed);
+#endif
 	win_changed(0); /* do initial resizing */
 #if ENABLE_FEATURE_GETUSERNAME_AND_HOMEDIR
 	{
@@ -1727,8 +1755,10 @@ int read_line_input(const char* prompt, char* command, int maxsize, line_input_t
 #endif
 	/* restore initial_settings */
 	setTermSettings(STDIN_FILENO, (void *) &initial_settings);
+#ifndef __MINGW32__
 	/* restore SIGWINCH handler */
 	signal(SIGWINCH, previous_SIGWINCH_handler);
+#endif
 	fflush(stdout);
 	return command_len;
 }
@@ -1740,6 +1770,46 @@ line_input_t *new_line_input_t(int flags)
 	return n;
 }
 
+#ifdef __MINGW32__
+#include <windef.h>
+#include <wincon.h>
+#include "strbuf.h"
+
+#undef safe_read
+static int wincon_read(int fd, char *buf, int size)
+{
+	static struct strbuf input = STRBUF_INIT;
+	HANDLE cin = GetStdHandle(STD_INPUT_HANDLE);
+	static int initialized = 0;
+
+	if (fd != 0)
+		die("wincon_read is for stdin only");
+	if (cin == INVALID_HANDLE_VALUE)
+		return safe_read(fd, buf, size);
+	if (!initialized) {
+		SetConsoleMode(cin, ENABLE_ECHO_INPUT);
+		initialized = 1;
+	}
+	while (input.len < size) {
+		INPUT_RECORD record;
+		DWORD nevent = 0, nevent_out;
+		int ch;
+
+		if (!ReadConsoleInput(cin, &record, 1, &nevent_out))
+			return -1;
+		if (record.EventType != KEY_EVENT || !record.Event.KeyEvent.bKeyDown)
+			continue;
+		ch = record.Event.KeyEvent.uChar.AsciiChar;
+		/* Ctrl-X is handled by ReadConsoleInput, Alt-X is not needed anyway */
+		strbuf_addch(&input, ch);
+	}
+	memcpy(buf, input.buf, size);
+	memcpy(input.buf, input.buf+size, input.len-size+1);
+	strbuf_setlen(&input, input.len-size);
+	return size;
+}
+#endif
+
 #else
 
 #undef read_line_input
-- 
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