From 8015fbfc160be0dcfd98e8662d510099d57b434d Mon Sep 17 00:00:00 2001
From: Mark McCaskey <mark@wasmer.io>
Date: Fri, 5 Apr 2019 13:59:33 -0700
Subject: [PATCH 1/2] implement strftime

---
 lib/emscripten/src/time.rs | 57 ++++++++++++++++++++++++++++++++++----
 1 file changed, 51 insertions(+), 6 deletions(-)

diff --git a/lib/emscripten/src/time.rs b/lib/emscripten/src/time.rs
index 1f93f3894ae..1cfa984563c 100644
--- a/lib/emscripten/src/time.rs
+++ b/lib/emscripten/src/time.rs
@@ -298,17 +298,62 @@ pub fn _time(ctx: &mut Ctx, time_p: u32) -> i32 {
 
 /// emscripten: _strftime
 pub fn _strftime(
-    _ctx: &mut Ctx,
-    _s_ptr: c_int,
-    _maxsize: u32,
-    _format_ptr: c_int,
-    _tm_ptr: c_int,
+    ctx: &mut Ctx,
+    s_ptr: c_int,
+    maxsize: u32,
+    format_ptr: c_int,
+    tm_ptr: c_int,
 ) -> i32 {
     debug!(
         "emscripten::_strftime {} {} {} {}",
         _s_ptr, _maxsize, _format_ptr, _tm_ptr
     );
-    0
+
+    #[allow(clippy::cast_ptr_alignment)]
+    let s = emscripten_memory_pointer!(ctx.memory(0), s_ptr) as *mut c_char;
+    #[allow(clippy::cast_ptr_alignment)]
+    let format = emscripten_memory_pointer!(ctx.memory(0), format_ptr) as *const c_char;
+    #[allow(clippy::cast_ptr_alignment)]
+    let tm = emscripten_memory_pointer!(ctx.memory(0), tm_ptr) as *const guest_tm;
+
+    let format_string = unsafe { std::ffi::CStr::from_ptr(format).to_str().unwrap() };
+
+    debug!("=> format_string: {:?}", format_string);
+
+    let tm = unsafe { &*tm };
+
+    let rust_tm = ::time::Tm {
+        tm_sec: tm.tm_sec,
+        tm_min: tm.tm_min,
+        tm_hour: tm.tm_hour,
+        tm_mday: tm.tm_mday,
+        tm_mon: tm.tm_mon,
+        tm_year: tm.tm_year,
+        tm_wday: tm.tm_wday,
+        tm_yday: tm.tm_yday,
+        tm_isdst: tm.tm_isdst,
+        tm_utcoff: tm.tm_gmtoff,
+        tm_nsec: 0,
+    };
+
+    let result_str = match ::time::strftime(format_string, &rust_tm) {
+        Ok(res_string) => res_string,
+        // TODO: maybe match on e in Err(e) and return different values if required
+        _ => return 0,
+    };
+
+    // pad for null?
+    let bytes = result_str.chars().count();
+    if bytes as u32 > maxsize {
+        return 0;
+    } else {
+        // write output string
+        for (i, c) in result_str.chars().enumerate() {
+            unsafe { *s.add(i) = c as c_char };
+        }
+        // null terminate?
+        bytes as i32
+    }
 }
 
 /// emscripten: _strftime_l

From b0a83408ec3f666fde78bb524ad204c69b586d77 Mon Sep 17 00:00:00 2001
From: Mark McCaskey <mark@wasmer.io>
Date: Fri, 5 Apr 2019 14:33:49 -0700
Subject: [PATCH 2/2] fix debug statement

---
 lib/emscripten/src/time.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/emscripten/src/time.rs b/lib/emscripten/src/time.rs
index 1cfa984563c..312808a82da 100644
--- a/lib/emscripten/src/time.rs
+++ b/lib/emscripten/src/time.rs
@@ -306,7 +306,7 @@ pub fn _strftime(
 ) -> i32 {
     debug!(
         "emscripten::_strftime {} {} {} {}",
-        _s_ptr, _maxsize, _format_ptr, _tm_ptr
+        s_ptr, maxsize, format_ptr, tm_ptr
     );
 
     #[allow(clippy::cast_ptr_alignment)]