1 files changed, 59 insertions, 0 deletions
diff --git a/src/libc/vendor/sortix/vsscanf.c b/src/libc/vendor/sortix/vsscanf.c
new file mode 100644
index 0000000..d2388be
--- /dev/null
+++ b/src/libc/vendor/sortix/vsscanf.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2012, 2014 Jonas 'Sortie' Termansen.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * stdio/vsscanf.c
+ * Input format conversion.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+
+struct vsscanf_input
+{
+	union
+	{
+		const char* str;
+		const unsigned char* ustr;
+	};
+	size_t offset;
+};
+
+static int vsscanf_fgetc(void* fp)
+{
+	struct vsscanf_input* input = (struct vsscanf_input*) fp;
+	if ( !input->ustr[input->offset] )
+		return EOF;
+	return (int) input->ustr[input->offset++];
+}
+
+static int vsscanf_ungetc(int c, void* fp)
+{
+	struct vsscanf_input* input = (struct vsscanf_input*) fp;
+	if ( c == EOF && !input->ustr[input->offset] )
+		return c;
+	assert(input->offset);
+	input->offset--;
+	assert(input->ustr[input->offset] == (unsigned char) c);
+	return c;
+}
+
+int vsscanf(const char* str, const char* format, va_list ap)
+{
+	struct vsscanf_input input;
+	input.str = str;
+	input.offset = 0;
+	return vcbscanf(&input, vsscanf_fgetc, vsscanf_ungetc, format, ap);
+}
+