Revision: 64369
http://sourceforge.net/p/brlcad/code/64369
Author: carlmoore
Date: 2015-03-11 20:40:55 +0000 (Wed, 11 Mar 2015)
Log Message:
-----------
implement run-with-no-arguments-gets-help; we don't expect the input or output
to be user-readable
Modified Paths:
--------------
brlcad/trunk/src/util/plot3-hpgl.c
Modified: brlcad/trunk/src/util/plot3-hpgl.c
===================================================================
--- brlcad/trunk/src/util/plot3-hpgl.c 2015-03-11 16:51:28 UTC (rev 64368)
+++ brlcad/trunk/src/util/plot3-hpgl.c 2015-03-11 20:40:55 UTC (rev 64369)
@@ -32,6 +32,7 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include "bio.h"
#include "bu/log.h"
#include "bu/str.h"
@@ -42,6 +43,10 @@
#define geti(x) { (x) = getchar(); (x) |= (short)(getchar()<<8); }
#define getb(x) ((x) = getchar())
+void printusage (const char *name)
+{
+ bu_exit(1, "Usage: %s < infile > outfile\n", name);
+}
int
main(int argc, char **argv)
@@ -51,9 +56,13 @@
int c, i, x, y, x1, x2, y1, y2, r, g, b;
if (argc != 1) {
- bu_exit(1, "Usage: %s < infile > outfile\n", argv[0]);
+ printusage(argv[0]);
}
+ if (isatty(fileno(stdin)) || isatty(fileno(stdout))) {
+ printusage(argv[0]);
+ }
+
getb(c);
do {
switch (c) {
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