diff --git a/src/emitter.rs b/src/emitter.rs
index 38bc57b..6e016ff 100644
--- a/src/emitter.rs
+++ b/src/emitter.rs
@@ -2017,8 +2017,7 @@ unsafe fn yaml_emitter_write_plain_scalar(
             if allow_breaks != 0
                 && spaces == 0
                 && (*emitter).column > (*emitter).best_width
-                && !(*string.pointer.wrapping_offset(1_isize) as libc::c_int
-                    == ' ' as i32 as yaml_char_t as libc::c_int)
+                && !IS_SPACE_AT!(string, 1)
             {
                 if yaml_emitter_write_indent(emitter) == 0 {
                     return 0_i32;
@@ -2086,8 +2085,7 @@ unsafe fn yaml_emitter_write_single_quoted_scalar(
                 && (*emitter).column > (*emitter).best_width
                 && string.pointer != string.start
                 && string.pointer != string.end.wrapping_offset(-(1_isize))
-                && !(*string.pointer.wrapping_offset(1_isize) as libc::c_int
-                    == ' ' as i32 as yaml_char_t as libc::c_int)
+                && !IS_SPACE_AT!(string, 1)
             {
                 if yaml_emitter_write_indent(emitter) == 0 {
                     return 0_i32;
@@ -2336,9 +2334,7 @@ unsafe fn yaml_emitter_write_double_quoted_scalar(
                 if yaml_emitter_write_indent(emitter) == 0 {
                     return 0_i32;
                 }
-                if *string.pointer.wrapping_offset(1_isize) as libc::c_int
-                    == ' ' as i32 as yaml_char_t as libc::c_int
-                {
+                if IS_SPACE_AT!(string, 1) {
                     if !(PUT!(emitter, '\\')) {
                         return 0_i32;
                     }
@@ -2544,8 +2540,7 @@ unsafe fn yaml_emitter_write_folded_scalar(
             }
             if breaks == 0
                 && IS_SPACE!(string)
-                && !(*string.pointer.wrapping_offset(1_isize) as libc::c_int
-                    == ' ' as i32 as yaml_char_t as libc::c_int)
+                && !IS_SPACE_AT!(string, 1)
                 && (*emitter).column > (*emitter).best_width
             {
                 if yaml_emitter_write_indent(emitter) == 0 {
diff --git a/src/macros.rs b/src/macros.rs
index b189179..bb757a5 100644
--- a/src/macros.rs
+++ b/src/macros.rs
@@ -250,12 +250,15 @@ macro_rules! IS_BOM {
 }
 
 macro_rules! IS_SPACE_AT {
-    () => {}; // TODO
+    ($string:expr, $offset:expr) => {
+        *$string.pointer.wrapping_offset($offset as isize) as libc::c_int
+            == ' ' as i32 as yaml_char_t as libc::c_int
+    };
 }
 
 macro_rules! IS_SPACE {
     ($string:expr) => {
-        *$string.pointer as libc::c_int == ' ' as i32 as yaml_char_t as libc::c_int
+        IS_SPACE_AT!($string, 0)
     };
 }
 
@@ -274,9 +277,7 @@ macro_rules! IS_TAB {
 
 macro_rules! IS_BLANK_AT {
     ($string:expr, $offset:expr) => {
-        *$string.pointer.wrapping_offset($offset as isize) as libc::c_int
-            == ' ' as i32 as yaml_char_t as libc::c_int
-            || IS_TAB_AT!($string, $offset)
+        IS_SPACE_AT!($string, $offset) || IS_TAB_AT!($string, $offset)
     };
 }