src/main.c (xvsprintf): limit memory allocation to 200K when vsnprintf return -1.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/conf.h b/src/conf.h
index d0322cc..8a62c20 100644
--- a/src/conf.h
+++ b/src/conf.h
@@ -123,4 +123,10 @@
 #define DEFAULT_FONT "-*-fixed-bold-r-normal-*-15-*-*-*-c-*-*-*"
 #define BACKUP_FONT "*"
 
+/* maximum xvsprintf result string length for systems with pre-C99 snprintf:
+ * on errors that are either permanent or cannot be distinguished from those
+ * as libc's snprintf might by returning -1 for too small buffers, at most
+ * the double of this value is tried before giving up */
+#define MAX_LEGACY_SNPRINTF_SIZE 102400
+
 #endif /* !_ _RATPOISON_CONF_H */