Initial commit

baud.c

@@ -0,0 +1,72 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <time.h>
+
+/*
+
+	baud - A tool to simulate a specified baud rate in a pipe.
+
+	I wrote this to be able to play some of the old VT100/ansi animations
+	at the rate of your choice.  Since most terminal emulator apps render
+	the text as fast as the system can (which is effectively instantaneous),
+	the animations do not actually animate.  This allows you to add 
+	a throttle to view as if you were on an actual serial terminal.
+
+	It takes one parameter, which is the desired baud rate.  If you do not
+	specify one, it will use the default defined below.  Extra parameters
+	will be ignored.
+
+	-- Scott Garrett
+	   version 2022050401
+
+*/
+
+#define defaultbaudrate	9600
+
+int main(int argc, char *argv[])
+{
+	int baudrate;
+	int c;
+
+	if ( argc == 1 )
+		baudrate = defaultbaudrate;
+	else
+		baudrate = atoi(argv[1]); 
+
+	/* Cannot have a negative baud rate, and 0 makes no sense
+	   (and would cause a division by zero).
+	*/
+	if ( baudrate <= 0 )
+	{
+		printf("Invalid baud rate: %d\n", baudrate);
+		exit(1);
+	}
+
+	/* Convert the desired baud rate into nanoseconds */
+	int baud = 10000000000 / baudrate;
+
+	/* Make sure the final value is in the valid range that nanosleep()
+	   supports.
+	*/
+	if ( baud < 0 || baud > 999999999 )
+	{
+		printf("Invalid baud rate: %d\n", baudrate);
+		exit(1);
+	}
+
+	/* Now that we know the desired baud rate delay in nanoseconds,
+	   load up the struct with the values.  0 seconds and the baud rate delay.
+	*/
+	struct timespec remaining, request = {0, baud};
+
+	while ((c = getchar()) != EOF)
+	{
+		/* Here we grab a character from stdin, write it, flush it out
+		   so it is seen immediately, then pause for "remaining" nanoseconds.
+		*/
+		putchar((char)c);
+		fflush(stdout);
+		int response = nanosleep(&request, &remaining);
+	}
+}