Use libc::c_long as the integer type

Author: Árni Dagur

src/shadow.rs

@@ -29,13 +29,13 @@ pub struct Shadow {
     /// It is expressed as the number of days since Jan 1, 1970. The value 0
     /// has a special meaning, which is that the user should change their
     /// password the next time they will log in the system
-    pub last_change: i64,
+    pub last_change: libc::c_long,
     /// Minimum password age
     ///
     /// The minimum password age is the number of days the user will have to
     /// wait before she will be allowed to change their password again.
     /// An empty field and value 0 mean that there are no minimum password age.
-    pub min: i64,
+    pub min: libc::c_long,
     /// Maximum password age
     ///
     /// The maximum password age is the number of days after which the user
@@ -47,15 +47,15 @@ pub struct Shadow {
     ///
     /// If the maximum password age is lower than the minimum password age, the
     /// user cannot change their password.
-    pub max: i64,
+    pub max: libc::c_long,
     /// Password warning period
     ///
     /// The number of days before a password is going to expire (see the
     /// maximum password age above) during which the user should be warned.
     ///
     /// An empty field and value 0 mean that there are no password warning
     /// period.
-    pub warn: i64,
+    pub warn: libc::c_long,
     /// Password inactivity period
     ///
     /// The number of days after a password has expired (see the maximum
@@ -65,7 +65,7 @@ pub struct Shadow {
     /// After expiration of the password and this expiration period is elapsed,
     /// no login is possible using the current user's password. The user should
     /// contact their system administrator.
-    pub inactive: i64,
+    pub inactive: libc::c_long,
     /// Account expiration date
     ///
     /// The date of expiration of the account, expressed as the number of days
@@ -78,7 +78,7 @@ pub struct Shadow {
     ///
     /// The value 0 should not be used as it is interpreted as either an account
     /// with no expiration, or as an expiration on Jan 1, 1970.
-    pub expire: i64,
+    pub expire: libc::c_long,
 }
 
 impl From<&libc::spwd> for Shadow {
@@ -89,12 +89,12 @@ impl From<&libc::spwd> for Shadow {
             // These casts are necessary to convert the C `long int`
             // integers (which can be either 32 or 64 bits, depending on
             // the CPU architecture) into 64 bit integers.
-            last_change: spwd.sp_lstchg as i64,
-            min: spwd.sp_min as i64,
-            max: spwd.sp_max as i64,
-            warn: spwd.sp_warn as i64,
-            inactive: spwd.sp_inact as i64,
-            expire: spwd.sp_expire as i64,
+            last_change: spwd.sp_lstchg,
+            min: spwd.sp_min,
+            max: spwd.sp_max,
+            warn: spwd.sp_warn,
+            inactive: spwd.sp_inact,
+            expire: spwd.sp_expire,
         }
     }
 }