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, 13 insertions, 0 deletions

diff --git a/system/lib/libc/musl/src/stdio/asprintf.c b/system/lib/libc/musl/src/stdio/asprintf.c
new file mode 100644
index 00000000..4ec83534
--- /dev/null
+++ b/system/lib/libc/musl/src/stdio/asprintf.c
@@ -0,0 +1,13 @@
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <stdarg.h>
+
+int asprintf(char **s, const char *fmt, ...)
+{
+	int ret;
+	va_list ap;
+	va_start(ap, fmt);
+	ret = vasprintf(s, fmt, ap);
+	va_end(ap);
+	return ret;
+}