1 files changed, 27 insertions, 0 deletions
diff --git a/src/stdio/vsscanf.c b/src/stdio/vsscanf.c
new file mode 100644
index 0000000..4d6d259
--- /dev/null
+++ b/src/stdio/vsscanf.c
@@ -0,0 +1,27 @@
+#include "stdio_impl.h"
+#include <string.h>
+
+static size_t string_read(FILE *f, unsigned char *buf, size_t len)
+{
+	char *src = f->cookie;
+	size_t k = len+256;
+	char *end = memchr(src, 0, k);
+	if (end) k = end-src;
+	if (k < len) len = k;
+	memcpy(buf, src, len);
+	f->rpos = (void *)(src+len);
+	f->rend = (void *)(src+k);
+	f->cookie = src+k;
+	return len;
+}
+
+int vsscanf(const char *restrict s, const char *restrict fmt, va_list ap)
+{
+	FILE f = {
+		.buf = (void *)s, .cookie = (void *)s,
+		.read = string_read, .lock = -1
+	};
+	return vfscanf(&f, fmt, ap);
+}
+
+weak_alias(vsscanf,__isoc99_vsscanf);