From e85dbe69e37065ec76e701d4b3d26a7cb175701f Mon Sep 17 00:00:00 2001
From: Markus Klein <markus-klein@live.de>
Date: Sat, 1 May 2021 15:56:02 +0200
Subject: [PATCH] add DATA_AT_EXEC

---
 Cargo.toml       |  2 +-
 Changelog.md     |  6 ++++++
 src/functions.rs | 20 ++++++++++++++++----
 src/indicator.rs | 22 ++++++++++++++++++++++
 src/lib.rs       |  8 +++-----
 5 files changed, 48 insertions(+), 10 deletions(-)
 create mode 100644 src/indicator.rs

diff --git a/Cargo.toml b/Cargo.toml
index e5827ee..b716f38 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "odbc-sys"
-version = "0.18.0"
+version = "0.18.1"
 authors = ["Markus Klein <markus-klein@live.de>"]
 license = "MIT"
 description = "ODBC ffi bindings"
diff --git a/Changelog.md b/Changelog.md
index 1fe5c22..f0c0119 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -1,6 +1,12 @@
 Changelog
 =========
 
+0.18.1
+------
+
+* Add `DATA_AT_EXEC`
+* Add `fn len_data_at_exec`
+
 0.18.0
 ------
 
diff --git a/src/functions.rs b/src/functions.rs
index bdb592f..97a964d 100644
--- a/src/functions.rs
+++ b/src/functions.rs
@@ -7,10 +7,22 @@ use crate::{
 
 // static linking is not currently supported here for windows
 #[cfg_attr(windows, link(name = "odbc32"))]
-#[cfg_attr(all(not(windows), not(feature = "static"), not(feature = "iodbc")), link(name = "odbc"))]
-#[cfg_attr(all(not(windows), feature = "static", not(feature = "iodbc")), link(name = "odbc", kind = "static"))]
-#[cfg_attr(all(not(windows), not(feature = "static"), feature = "iodbc"), link(name = "iodbc"))]
-#[cfg_attr(all(not(windows), feature = "static", feature = "iodbc"), link(name = "iodbc", kind = "static"))]
+#[cfg_attr(
+    all(not(windows), not(feature = "static"), not(feature = "iodbc")),
+    link(name = "odbc")
+)]
+#[cfg_attr(
+    all(not(windows), feature = "static", not(feature = "iodbc")),
+    link(name = "odbc", kind = "static")
+)]
+#[cfg_attr(
+    all(not(windows), not(feature = "static"), feature = "iodbc"),
+    link(name = "iodbc")
+)]
+#[cfg_attr(
+    all(not(windows), feature = "static", feature = "iodbc"),
+    link(name = "iodbc", kind = "static")
+)]
 extern "system" {
     /// Allocates an environment, connection, statement, or descriptor handle.
     ///
diff --git a/src/indicator.rs b/src/indicator.rs
new file mode 100644
index 0000000..69e2766
--- /dev/null
+++ b/src/indicator.rs
@@ -0,0 +1,22 @@
+//! Special indicator values
+use crate::Len;
+
+/// Indicates `NULL` values.
+pub const NULL_DATA: Len = -1;
+
+/// Indicates that the size of the value is not known. ODBC returns this value in indicator buffers
+/// for truncated values of unknown size.
+pub const NO_TOTAL: Len = -4;
+
+/// Use this as the indicator argument to `SQLBindParameter` in order to indicate that the data is
+/// send at statement execution time.
+pub const DATA_AT_EXEC: Len = -2;
+
+/// Use result as the indicator argument to `SQLBindParameter` in order to indicate that the data is
+/// send at statement execution time. In contrast to `DATA_AT_EXEC` the total size is passed to the
+/// driver manager.
+pub fn len_data_at_exec(length: Len) -> Len {
+    const SQL_LEN_DATA_AT_EXEC_OFFSET: Len = -100;
+
+    -(length) + SQL_LEN_DATA_AT_EXEC_OFFSET
+}
diff --git a/src/lib.rs b/src/lib.rs
index e443815..41a9616 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -10,7 +10,8 @@
 
 pub use self::{
     attributes::*, bulk_operation::*, c_data_type::*, desc::*, fetch_orientation::*, functions::*,
-    info_type::*, interval::*, nullability::*, param_type::*, sql_data_type::*, sqlreturn::*,
+    indicator::*, info_type::*, interval::*, nullability::*, param_type::*, sql_data_type::*,
+    sqlreturn::*,
 };
 use std::os::raw::{c_int, c_void};
 
@@ -20,6 +21,7 @@ mod c_data_type;
 mod desc;
 mod fetch_orientation;
 mod functions;
+mod indicator;
 mod info_type;
 mod interval;
 mod nullability;
@@ -72,10 +74,6 @@ pub const MAX_MESSAGE_LENGTH: SmallInt = 512;
 pub const SQLSTATE_SIZE: usize = 5;
 pub const SQLSTATE_SIZEW: usize = 10;
 
-// Special SQLGetData indicator values
-pub const NULL_DATA: Len = -1;
-pub const NO_TOTAL: Len = -4;
-
 /// SQL Free Statement options
 #[repr(u16)]
 #[derive(Debug, PartialEq, Eq, Clone, Copy)]