tiny changes to gview's two error messages to make them a
bit clearer and more importantly plumb-able.

-Steve

Reference: /n/sources/patch/applied/gview-err-msgs
Date: Thu Sep 11 18:58:43 CES 2008
Signed-off-by: steve@quintile.net

--- /sys/src/cmd/gview.c	Thu Sep 11 18:56:19 2008
+++ /sys/src/cmd/gview.c	Thu Sep 11 18:56:16 2008
@@ -2103,6 +2103,7 @@
 void main(int argc, char *argv[])
 {
 	int e;
+	char err[ERRMAX];
 
 	ARGBEGIN {
 	case 'm':
@@ -2125,10 +2126,11 @@
 	do {
 		e = doinput(*argv ? *argv : "-");
 		if (e < 0) {
-			fprintf(stderr,"Cannot read input file %s\n", *argv);
+			rerrstr(err, sizeof(err));
+			fprintf(stderr,"%s: %s - cannot read file - %s\n", argv0, *argv, err);
 			exits("no valid input file");
 		} else if (e > 0) {
-			fprintf(stderr,"Bad syntax at line %d of file %s\n", e, *argv ? *argv : "-");
+			fprintf(stderr,"%s %s:%d - bad data syntax\n", argv0, (*argv ? *argv : "-"), e);
 			exits("bad syntax in input");
 		}
 	} while (*argv && *++argv);