kgiusti commented on a change in pull request #599: DISPATCH-1461: correct the
logging of long addresses on attach
URL: https://github.com/apache/qpid-dispatch/pull/599#discussion_r339190898
##########
File path: src/router_core/terminus.c
##########
@@ -76,30 +76,49 @@ void qdr_terminus_free(qdr_terminus_t *term)
}
+// DISPATCH-1461: snprintf() is evil - it returns >= size on overflow. This
+// wrapper will never return >= size, even if truncated. This makes it safe to
+// do pointer & length arithmetic without overflowing the destination buffer in
+// qdr_terminus_format()
+//
+static inline int safe_snprintf(char *str, size_t size, const char *format,
...)
+{
+ va_list ap;
+ va_start(ap, format);
+ int rc = vsnprintf(str, size, format, ap);
+ va_end(ap);
+
+ if (size && rc >= size)
+ return strlen(str); // return actual # of bytes written
Review comment:
Hmmm.... I suppose size - 1 would work (snprintf return count excludes the
null byte).
I'll give it a try.
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