Add sprintf, snprintf, and the scanf family for Windows

Author: dropbear32

libc-test/semver/windows.txt

@@ -212,6 +212,7 @@ fputs
 fread
 free
 freopen
+fscanf
 fseek
 fsetpos
 fstat
@@ -286,6 +287,7 @@ remove
 rename
 rewind
 rmdir
+scanf
 sendto
 setbuf
 setlocale
@@ -294,9 +296,12 @@ setvbuf
 sighandler_t
 signal
 size_t
+snprintf
 sockaddr
 socket
+sprintf
 srand
+sscanf
 ssize_t
 stat
 strcat

src/windows/mod.rs

@@ -260,6 +260,17 @@ cfg_if! {
         extern "C" {
             pub fn printf(format: *const c_char, ...) -> c_int;
             pub fn fprintf(stream: *mut FILE, format: *const c_char, ...) -> c_int;
+            pub fn snprintf(
+                buffer: *mut c_char,
+                count: size_t,
+                format: *const c_char,
+                ...
+            ) -> c_int;
+            pub fn sprintf(buffer: *mut c_char, format: *const c_char, ...) -> c_int;
+
+            pub fn scanf(format: *const c_char, ...) -> c_int;
+            pub fn sscanf(buffer: *const c_char, format: *const c_char, ...) -> c_int;
+            pub fn fscanf(stream: *mut FILE, format: *const c_char, ...) -> c_int;
         }
     }
 }