Migrate to using musl libc sprintf family to gain compiled asm.js performance. Keep a copy of handwritten vfprintf and fprintf around to be compatible with the Emscripten filesystem IO library. Also migrate frexp which sprintf depends on to musl libc.

1 files changed, 7 insertions, 0 deletions

diff --git a/system/lib/libc/musl/src/stdio/vsprintf.c b/system/lib/libc/musl/src/stdio/vsprintf.c
new file mode 100644
index 00000000..c57349d4
--- /dev/null
+++ b/system/lib/libc/musl/src/stdio/vsprintf.c
@@ -0,0 +1,7 @@
+#include <stdio.h>
+#include <limits.h>
+
+int vsprintf(char *restrict s, const char *restrict fmt, va_list ap)
+{
+	return vsnprintf(s, INT_MAX, fmt, ap);
+}