move __string_read into vsscanf source file

apparently this function was intended at some point to be used by
strto* family as well, and thus was put in its own file; however, as
far as I can tell, it's only ever been used by vsscanf. move it to the
same file to reduce the number of source files and external symbols.

1 files changed, 13 insertions, 3 deletions

diff --git a/src/stdio/vsscanf.c b/src/stdio/vsscanf.c
index 98500225..4d6d259b 100644
--- a/src/stdio/vsscanf.c
+++ b/src/stdio/vsscanf.c
@@ -1,15 +1,25 @@
 #include "stdio_impl.h"
+#include <string.h>
 
-static size_t do_read(FILE *f, unsigned char *buf, size_t len)
+static size_t string_read(FILE *f, unsigned char *buf, size_t len)
 {
-	return __string_read(f, buf, 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 = do_read, .lock = -1
+		.read = string_read, .lock = -1
 	};
 	return vfscanf(&f, fmt, ap);
 }