From: David ‘Bombe’ Roden <bombe@pterodactylus.net>
Date: Mon, 27 Jun 2011 06:23:58 +0000 (+0200)
Subject: Exit show-time if terminal width is unknown.
X-Git-Url: https://git.pterodactylus.net/?a=commitdiff_plain;ds=sidebyside;p=show-time.git

Exit show-time if terminal width is unknown.
---

diff --git a/show-time.c b/show-time.c
index 4e4369f..9f02fc0 100644
--- a/show-time.c
+++ b/show-time.c
@@ -18,7 +18,7 @@ int getColumns() {
 	if (!error) {
 		return terminalSize.ws_col;
 	}
-	return 80;
+	return -1;
 }
 
 int main(int argc, char** argv) {
@@ -26,6 +26,7 @@ int main(int argc, char** argv) {
 	struct tm *localTime;
 	time_t currentTime;
 	char buffer[80];
+	int terminalWidth;
 
 	if (fork() != 0) {
 		return 0;
@@ -36,7 +37,11 @@ int main(int argc, char** argv) {
 		localTime = localtime(&currentTime);
 		strftime(buffer, 80, "%d.%m.%Y %H:%M:%S", localTime);
 		printf("%c[s", 27); /* save cursor position */
-		printf("%c[%d;%dH", 27, 1, (int) (getColumns() - strlen(buffer))); /* set cursor */
+		terminalWidth = getColumns();
+		if (terminalWidth == -1) {
+			return 0;
+		}
+		printf("%c[%d;%dH", 27, 1, (int) (terminalWidth - strlen(buffer))); /* set cursor */
 		printf("%s", buffer);
 		printf("%c[u", 27); /* restore cursor position */
 		fflush(stdout);