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.

1 files changed, 70 insertions, 0 deletions

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