libc: minimal: define off_t as a signed, 64-bit integer

The off_t type effectively limits the maximum file size that
can be measured with a POSIX system. Rather than limiting it
to the word-size of the architecture (usually equivalent to
the pointer size), strictly use a signed, 64-bit integer.

Signed-off-by: Chris Friedt <[email protected]>

lib/libc/minimal/include/sys/_types.h

@@ -12,6 +12,10 @@
 
 #include <stdint.h>
 
+#include <zephyr/types.h>
+
+typedef k_off_t _OFF_T_;
+typedef k_ssize_t _SSIZE_T_;
 typedef int64_t _TIME_T_;
 typedef int32_t _SUSECONDS_T_;
 

lib/libc/minimal/include/sys/types.h

@@ -15,25 +15,12 @@ typedef unsigned int mode_t;
 
 #if !defined(__ssize_t_defined)
 #define __ssize_t_defined
-
-/* Static code analysis tool can raise a violation
- * in the line below where name of macro 'unsigned' is the same
- * as keyword. It is made on purpose, deliberated deviation.
- *
- * We trick compiler to make sure the type of ssize_t won't be unsigned long.
- * As otherwise the type of ssize_t will be unsigned long
- * which is not correct. More details view in commit b889120
- */
-#define unsigned signed /* parasoft-suppress MISRAC2012-RULE_20_4-a MISRAC2012-RULE_20_4-b */
-typedef __SIZE_TYPE__ ssize_t;
-#undef unsigned
-
+typedef _SSIZE_T_ ssize_t;
 #endif
 
 #if !defined(__off_t_defined)
 #define __off_t_defined
-/* off_t is defined such that it matches the size of a pointer */
-typedef __INTPTR_TYPE__ off_t;
+typedef _OFF_T_ off_t;
 #endif
 
 #if !defined(__time_t_defined)