fix: integer parsed as float when EINTR set in errno (#4506)

* fix: integer parsed as float when EINTR set in errno

* chore: make amalgamate

* chore: make pretty

---------

Co-authored-by: Stuart Gorman <[email protected]>

Author: StuartGorman

include/nlohmann/detail/input/lexer.hpp

@@ -1256,7 +1256,7 @@ class lexer : public lexer_base<BasicJsonType>
             // we checked the number format before
             JSON_ASSERT(endptr == token_buffer.data() + token_buffer.size());
 
-            if (errno == 0)
+            if (errno != ERANGE)
             {
                 value_unsigned = static_cast<number_unsigned_t>(x);
                 if (value_unsigned == x)
@@ -1272,7 +1272,7 @@ class lexer : public lexer_base<BasicJsonType>
             // we checked the number format before
             JSON_ASSERT(endptr == token_buffer.data() + token_buffer.size());
 
-            if (errno == 0)
+            if (errno != ERANGE)
             {
                 value_integer = static_cast<number_integer_t>(x);
                 if (value_integer == x)

single_include/nlohmann/json.hpp

@@ -8725,7 +8725,7 @@ class lexer : public lexer_base<BasicJsonType>
             // we checked the number format before
             JSON_ASSERT(endptr == token_buffer.data() + token_buffer.size());
 
-            if (errno == 0)
+            if (errno != ERANGE)
             {
                 value_unsigned = static_cast<number_unsigned_t>(x);
                 if (value_unsigned == x)
@@ -8741,7 +8741,7 @@ class lexer : public lexer_base<BasicJsonType>
             // we checked the number format before
             JSON_ASSERT(endptr == token_buffer.data() + token_buffer.size());
 
-            if (errno == 0)
+            if (errno != ERANGE)
             {
                 value_integer = static_cast<number_integer_t>(x);
                 if (value_integer == x)