From ba09e1d356a5f8b5c25de3cec25fbcc51fdc944b Mon Sep 17 00:00:00 2001
From: "R. Eric Wheeler" <sikofitt@gmail.com>
Date: Sat, 27 Feb 2021 19:10:44 -0800
Subject: [PATCH] Updated libgetch, now includes cinPeek function

---
 src/Console/Getch.php             |  19 +++++-
 src/Console/Resources/getch.c     | 101 +++++++++++++++++++++++++++---
 src/Console/Resources/libgetch.so | Bin 16792 -> 17032 bytes
 tests/Getch/GetchTest.php         |  10 +++
 4 files changed, 118 insertions(+), 12 deletions(-)

diff --git a/src/Console/Getch.php b/src/Console/Getch.php
index 5479c35..dbcc7d8 100644
--- a/src/Console/Getch.php
+++ b/src/Console/Getch.php
@@ -67,19 +67,32 @@ final class Getch
         if (null === self::$ffi) {
             $osFamily = PHP_OS_FAMILY;
             if ('Windows' === $osFamily) {
-                self::$ffi = FFI::cdef(self::DECLARATIONS, self::WINDOWS_LIBRARY);
+                $declarations = self::DECLARATIONS . ' int _kbhit();';
+                self::$ffi = FFI::cdef($declarations, self::WINDOWS_LIBRARY);
             } elseif ('Linux' === $osFamily) {
                 if (!file_exists($linuxLibrary)) {
                     throw new RuntimeException(sprintf('Could not find library file %s.', $linuxLibrary));
                 }
-
-                self::$ffi = FFI::cdef(self::DECLARATIONS, $linuxLibrary);
+                $declarations = self::DECLARATIONS . ' int cinPeek();';
+                self::$ffi = FFI::cdef($declarations, $linuxLibrary);
             } else {
                 throw new RuntimeException(sprintf('Sorry, %s is not supported yet.', $osFamily));
             }
         }
     }
 
+    public function peek(): int
+    {
+        if(PHP_OS_FAMILY === 'Windows') {
+            if($ffi->_kbhit()) {
+                $result = $ffi->_getch();
+                $ffi->_ungetch($result);
+                return $result;
+            }
+            return -1;
+        }
+        return $ffi->cinPeek();
+    }
 /*    public function keyCode(string $device): array
     {
 
diff --git a/src/Console/Resources/getch.c b/src/Console/Resources/getch.c
index ac71127..b39122a 100644
--- a/src/Console/Resources/getch.c
+++ b/src/Console/Resources/getch.c
@@ -20,6 +20,33 @@
 
 static struct termios oldTermAttributes;
 
+inline static void reverseString(char * str)
+{
+    if (str)
+    {
+        char * end = str + strlen(str) - 1;
+
+        // swap the values in the two given variables
+        // XXX: fails when a and b refer to same memory location
+#   define XOR_SWAP(a,b) do\
+    {\
+      (a) ^= (b);\
+      (b) ^= (a);\
+      (a) ^= (b);\
+    } while (0)
+
+        // walk inwards from both ends of the string,
+        // swapping until we get to the middle
+        while (str < end)
+        {
+            XOR_SWAP(*str, *end);
+            str++;
+            end--;
+        }
+#   undef XOR_SWAP
+    }
+}
+
 static int discardRead(unsigned int length)
 {
     char buffer[length];
@@ -37,7 +64,7 @@ static int discardRead(unsigned int length)
     return (int)bytesRead;
 }
 
-static int getEventDevice(const char * device)
+static int getEventDevice(char ** device)
 {
     glob_t search;
 
@@ -63,7 +90,8 @@ static int getEventDevice(const char * device)
     for(int i = 0; i<search.gl_pathc;i++) {
         if(access(search.gl_pathv[i], F_OK) == 0) {
             pathLength = strlen(search.gl_pathv[i]) + 1;
-            strncpy((char *)device, search.gl_pathv[i], pathLength);
+            *device = (char *)malloc(pathLength);
+            strcpy(*device, search.gl_pathv[i]);
             globfree(&search);
             return 1;
         }
@@ -75,30 +103,38 @@ static int getEventDevice(const char * device)
 
 static unsigned short getScanCode()
 {
-    struct input_event inputEvent[3];
+    struct input_event inputEvent[40];
     int eventDevice;
 
-    const char device[FILENAME_MAX];
-    if(getEventDevice(device) == -1) {
+    char *device;
+    if(getEventDevice(&device) == -1) {
          perror("getEventDevice");
+         free(device);
         return KEY_RESERVED;
     }
 
     if( ( eventDevice = open(device, O_RDONLY)) == -1 ) {
+        free(device);
         perror("open");
         return KEY_RESERVED;
     };
 
-
+    free(device);
 
     if( read(eventDevice, &inputEvent, sizeof(inputEvent)) == -1) {
         close(eventDevice);
+        perror("read");
         return KEY_RESERVED;
     }
 
     close(eventDevice);
 
-    for(int i = 0;i<3;i++) {
+   // for(int i = 0;i<39;i++) {
+   //     printf("Type %d, Code %d, Value %d\r\n", inputEvent[i].type, inputEvent[i].code, inputEvent[i].value);
+   // }
+
+    for(int i = 0;i<40;i++) {
+        //printf("Type %d, Code %d\n", inputEvent[i].type, inputEvent[i].code);
         if(inputEvent[i].type == EV_KEY && inputEvent[i].code != KEY_ENTER) {
             return inputEvent[i].code;
         }
@@ -152,7 +188,7 @@ static int readKey(void) {
 
         unsigned short scanCode = getScanCode();
 
-        if (scanCode == KEY_ESC || scanCode == KEY_RESERVED) {
+        if (scanCode == KEY_ESC ) {
             return 27;
         }
 
@@ -170,19 +206,23 @@ static int readKey(void) {
             case KEY_F2:
             case KEY_F3:
             case KEY_F4:
-
             case KEY_KP1: // END
             case KEY_KP2: // DOWN
             case KEY_KP4: // LEFT
             case KEY_KP6: // RIGHT
             case KEY_KP7: // HOME
             case KEY_KP8: // UP
+                //getchar();
+                //getchar();
                 discardBytes = 2;
                 break;
             case KEY_KP0: // INSERT
             case KEY_KPDOT: // DELETE
             case KEY_KP9: // PAGEUP
             case KEY_KP3: // PAGEDOWN
+            /*getchar();
+            getchar();
+            getchar(); */
                 discardBytes = 3;
                 break;
             case KEY_F5:
@@ -193,11 +233,16 @@ static int readKey(void) {
             case KEY_F10:
             case KEY_F11:
             case KEY_F12:
+          /*      getchar();
+                getchar();
+                getchar();
+                getchar(); */
                 discardBytes = 4;
                 break;
 
             default:
                 discardBytes = 0;
+                break;
         }
 
         if (discardBytes != 0) {
@@ -227,4 +272,42 @@ int _getch(void) {
 int _ungetch(int ch)
 {
     return ungetc(ch, stdin);
+}
+
+int *cinPeekCount(ushort count)
+{
+    char buffer[count];
+
+    int flags = fcntl(STDIN_FILENO, F_GETFL);
+
+    fcntl(STDIN_FILENO, F_SETFL, flags|O_NONBLOCK);
+
+    size_t byteCount = fread(&buffer, sizeof(char), count, stdin);
+
+    fcntl(STDIN_FILENO, F_SETFL, flags);
+
+    int *res = (int*)malloc(byteCount);
+
+    for(int i=0;i<byteCount;i++)
+    {
+            res[i] = (int)buffer[i];
+    }
+
+    reverseString(buffer);
+
+    for(int i=0;i<byteCount;i++) {
+        pushStdin(buffer[i]);
+    }
+
+    return res;
+}
+
+int cinPeek()
+{
+    int flags = fcntl(STDIN_FILENO, F_GETFL);
+    fcntl(STDIN_FILENO, F_SETFL, flags|O_NONBLOCK);
+    int result = fgetc(stdin);
+    fcntl(STDIN_FILENO, F_SETFL, flags);
+    ungetc(result, stdin);
+    return result;
 }
\ No newline at end of file
diff --git a/src/Console/Resources/libgetch.so b/src/Console/Resources/libgetch.so
index 886aca96e3c846fb87143e52dcac58b210e627b9..0556d8526aff1e03b0bea98d1a5876d1955af808 100755
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diff --git a/tests/Getch/GetchTest.php b/tests/Getch/GetchTest.php
index b71ee8c..ee6e859 100644
--- a/tests/Getch/GetchTest.php
+++ b/tests/Getch/GetchTest.php
@@ -70,4 +70,14 @@ class GetchTest extends TestCase
         self::assertEquals(0, $g->getch());
         self::assertEquals(71, $g->getch());
     }
+
+    public function setPeek()
+    {
+        $g = new Getch();
+        $g->ungetch('q');
+        $peek = $g->peek();
+        $getch = $g->getch();
+        self::assertEquals($peek, $getch);
+        self::assertEquals(113, $peek);
+    }
 }