initial checkout from wrc

1 files changed, 55 insertions, 0 deletions

diff --git a/user/progFG.c b/user/progFG.c
new file mode 100644
index 0000000..a43ca67
--- /dev/null
+++ b/user/progFG.c
@@ -0,0 +1,55 @@
+#include <common.h>
+
+/**
+** User function main #3:  exit, sleep, write
+**
+** Prints its ID, then loops N times sleeping and printing, then exits.
+**
+** Invoked as:  main3  x  n  s
+**	 where x is the ID character
+**		   n is the iteration count
+**		   s is the sleep time in seconds
+*/
+
+USERMAIN( main ) {
+	char ch = '3';	// default character to print
+	int nap = 10;	// default sleep time
+	int count = 30;	// iteration count
+	char buf[128];
+
+	// process the command-line arguments
+	switch( argc ) {
+	case 4:	nap = str2int( argv[3], 10 );
+			// FALL THROUGH
+	case 3:	count = str2int( argv[2], 10 );
+			// FALL THROUGH
+	case 2:	ch = argv[1][0];
+			break;
+	default:
+			sprint( buf, "main3: argc %d, args: ", argc );
+			cwrites( buf );
+			for( int i = 0; i <= argc; ++i ) {
+				sprint( buf, " %s", argv[argc] ? argv[argc] : "(null)" );
+				cwrites( buf );
+			}
+			cwrites( "\n" );
+	}
+
+	// announce our presence
+	int n = swritech( ch );
+	if( n != 1 ) {
+		sprint( buf, "=== %c, write #1 returned %d\n", ch, n );
+		cwrites( buf );
+	}
+
+	write( CHAN_SIO, &ch, 1 );
+
+	for( int i = 0; i < count ; ++i ) {
+		sleep( SEC_TO_MS(nap) );
+		write( CHAN_SIO, &ch, 1 );
+	}
+
+	exit( 0 );
+
+	return( 42 );  // shut the compiler up!
+}