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-rw-r--r--libc/stdio/vasprintf.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/libc/stdio/vasprintf.c b/libc/stdio/vasprintf.c
index 21ef8e145..1ef75df94 100644
--- a/libc/stdio/vasprintf.c
+++ b/libc/stdio/vasprintf.c
@@ -17,6 +17,19 @@
#warning Skipping vasprintf since no vsnprintf!
#else
+/* Deal with pre-C99 compilers. */
+
+#ifndef va_copy
+
+#ifdef __va_copy
+#define va_copy(A,B) __va_copy(A,B)
+#else
+#warning Neither va_copy (C99/SUSv3) nor __va_copy is defined. Using a simple copy instead. But you should really check that this is appropriate...
+#define va_copy(A,B) A = B
+#endif
+
+#endif /* va_copy */
+
int vasprintf(char **__restrict buf, const char * __restrict format,
va_list arg)
{