Initial revision

diff --git a/showkey.c b/showkey.c
new file mode 100644 (file)
index 0000000..abbfd71
--- /dev/null
+++ b/showkey.c
@@ -0,0 +1,87 @@
+/*
+ * showkey.c -- display cooked key sequences
+ *
+ * Invoke this (no arguments needed) to see keycap-to-keystrokes mappings.
+ *
+ * by Eric S. Raymond <esr@snark.thyrsus.com>, 1 Nov 88
+ */
+#include <stdio.h>
+#include <termio.h>
+#include <signal.h>
+
+#define META   0x80
+#define ESC    0x1b
+
+static char *lowchars[] =
+{
+    "NUL", "SOH", "STX", "ETX", "EOT", "ENQ", "ACK", "BEL",
+    "BS",  "HT",  "LF",  "VT",  "FF",  "CR",  "SO",  "SI",
+    "DLE", "DC1", "DC2", "DC3", "DC4", "NAK", "SYN", "ETB",
+    "CAN", "EM",  "SUB", "ESC", "FS",  "GS",  "RS",  "US",
+    "SP",
+};
+
+static int signalled;
+
+static void catcher(sig)
+int sig;
+{
+    signalled = sig;
+}
+
+main()
+{
+    struct termio      cooked, raw;
+    unsigned int       c, timeouts;
+
+    for (c = SIGHUP; c <= SIGPOLL; c++)
+       (void) signal(c, catcher);
+
+    (void) ioctl(0, TCGETA, &cooked);
+
+    (void) memcpy(&raw, &cooked, sizeof(struct termio));
+    raw.c_lflag &=~ (ICANON | ECHO);
+    raw.c_cc[VEOL] = 1;
+    raw.c_cc[VEOF] = 2;
+    (void) ioctl(0, TCSETA, &raw);
+
+    (void) printf("Type any key to see the sequence it sends, DEL to quit.\n");
+    signalled = 0;
+    timeouts = 1;
+    while (!signalled)
+    {
+       int             meta;
+
+       if (read(0, &c, 1) != 0)
+           timeouts = 0;
+       else
+       /*
+        * This is supposed to cause the program to emit a newline .2 sec
+        * after reading a key sequence, but it doesn't work, I don't know
+        * why.
+        */
+       {
+           if (timeouts++ == 0)
+               (void) putchar('\n');
+           continue;
+       }
+
+       if (meta = (c & META))
+           c &=~ META;
+
+       if (c <= ' ')
+           (void) printf("<%s%s>", meta ? "ALT-" : "", lowchars[c]);
+       else if (c == 0x3F)
+           (void) printf("<%sDEL>", meta ? "ALT-" : "");
+       else if (meta)
+           (void) printf("<ALT-%c>", c);
+       else
+           (void) putchar(c);
+       (void) fflush(stdout);
+    }
+
+    (void) printf("\nBye...\n");
+    (void) ioctl(0, TCSETA, &cooked);
+}
+
+/* showkey.c ends here */