From: Michael Tremer <michael.tremer@ipfire.org>
Date: Fri, 2 Jan 2015 13:41:33 +0000 (+0100)
Subject: installer: Fix crash with small screen resolutions
X-Git-Url: http://git.ipfire.org/?p=people%2Fdweismueller%2Fipfire-2.x.git;a=commitdiff_plain;h=7db3e17a4aa5cd7e8b1b9e1e9e53495aafa169ca

installer: Fix crash with small screen resolutions

The installer is showing a help line at the bottom of the
screen which is in some languages rather long. If it is
longer than the width of the screen, the installer used to
crash which is now fixed in this patch.
---

diff --git a/src/installer/main.c b/src/installer/main.c
index ab2cb8912..c97776d24 100644
--- a/src/installer/main.c
+++ b/src/installer/main.c
@@ -216,19 +216,31 @@ static char* get_system_release() {
 }
 
 static char* center_string(const char* str, int width) {
+	if (!str)
+		return NULL;
+
+	char* string = NULL;
 	unsigned int str_len = strlen(str);
 
-	unsigned int indent_length = (width - str_len) / 2;
-	char indent[indent_length + 1];
+	if (str_len == width) {
+		string = strdup(str);
 
-	for (unsigned int i = 0; i < indent_length; i++) {
-		indent[i] = ' ';
-	}
-	indent[indent_length] = '\0';
+	} else if (str_len > width) {
+		string = strdup(str);
+		string[width - 1] = '\0';
 
-	char* string = NULL;
-	if (asprintf(&string, "%s%s", indent, str) < 0)
-		return NULL;
+	} else {
+		unsigned int indent_length = (width - str_len) / 2;
+		char indent[indent_length + 1];
+
+		for (unsigned int i = 0; i < indent_length; i++) {
+			indent[i] = ' ';
+		}
+		indent[indent_length] = '\0';
+
+		if (asprintf(&string, "%s%s", indent, str) < 0)
+			return NULL;
+	}
 
 	return string;
 }
@@ -377,7 +389,8 @@ int main(int argc, char *argv[]) {
 
 	// Draw title
 	char* roottext = center_string(system_release, screen_cols);
-	newtDrawRootText(0, 0, roottext);
+	if (roottext)
+		newtDrawRootText(0, 0, roottext);
 
 	snprintf(title, sizeof(title), "%s - %s", NAME, SLOGAN);
 
@@ -423,7 +436,8 @@ int main(int argc, char *argv[]) {
 	else
 		helpline = center_string(_("<Tab>/<Alt-Tab> between elements | <Space> selects | <F12> next screen"), screen_cols);
 
-	newtPushHelpLine(helpline);
+	if (helpline)
+		newtPushHelpLine(helpline);
 
 	if (!config.unattended) {
 		snprintf(message, sizeof(message),