core: Fix results returned by gpgme_data_* functions

src/debug.h (TRACE_SYSRES_OFF_T, _trace_sysres_off_t,
TRACE_SYSRES_SSIZE_T, _trace_sysres_ssize_t): New.
src/data.c (gpgme_data_read, gpgme_data_write, gpgme_data_seek): Use
appropriate new tracing macros instead of casting the results to int.
--

This change adds tracing macros for results of system functions of
type __off_t and __ssize_t.

GnuPG-bug-id: 5481

src/data.c

@@ -391,7 +391,7 @@ gpgme_data_read (gpgme_data_t dh, void *buffer, size_t size)
       while (res < 0 && errno == EINTR);
     }
 
-  return TRACE_SYSRES ((int)res);
+  return TRACE_SYSRES_SSIZE_T (res);
 }
 
 
@@ -419,7 +419,7 @@ gpgme_data_write (gpgme_data_t dh, const void *buffer, size_t size)
     res = (*dh->cbs->write) (dh, buffer, size);
   while (res < 0 && errno == EINTR);
 
-  return TRACE_SYSRES ((int)res);
+  return TRACE_SYSRES_SSIZE_T (res);
 }
 
 
@@ -452,7 +452,7 @@ gpgme_data_seek (gpgme_data_t dh, gpgme_off_t offset, int whence)
   if (offset >= 0)
     dh->outbound_pending = 0;
 
-  return TRACE_SYSRES ((int)offset);
+  return TRACE_SYSRES_OFF_T (offset);
 }
 
 

src/debug.h

@@ -141,7 +141,7 @@ _trace_err (gpg_error_t err, int lvl, const char *func, int line)
   return err;
 }
 
-/* Trace a system call result and return it.  */
+/* Trace a system call result of type int and return it.  */
 #define TRACE_SYSRES(res) \
     _trace_sysres ((res), _gpgme_trace_level, _gpgme_trace_func, __LINE__)
 static inline int
@@ -157,6 +157,38 @@ _trace_sysres (int res, int lvl, const char *func, int line)
   return res;
 }
 
+/* Trace a system call result of type gpgme_off_t and return it.  */
+#define TRACE_SYSRES_OFF_T(res) \
+    _trace_sysres_off_t ((res), _gpgme_trace_level, _gpgme_trace_func, __LINE__)
+static inline gpgme_off_t
+_trace_sysres_off_t (gpgme_off_t res, int lvl, const char *func, int line)
+{
+  if (res >= 0)
+    _gpgme_debug (NULL, lvl, 3, func, NULL, NULL, "result=%ld", res);
+  else
+    _gpgme_debug (NULL, lvl, -1, NULL, NULL, NULL,
+                  "%s:%d: error: %s (%d)\n",
+                  func, line,  strerror (errno), errno);
+  _gpgme_debug_frame_end ();
+  return res;
+}
+
+/* Trace a system call result of type gpgme_ssize_t and return it.  */
+#define TRACE_SYSRES_SSIZE_T(res) \
+    _trace_sysres_ssize_t ((res), _gpgme_trace_level, _gpgme_trace_func, __LINE__)
+static inline gpgme_ssize_t
+_trace_sysres_ssize_t (gpgme_ssize_t res, int lvl, const char *func, int line)
+{
+  if (res >= 0)
+    _gpgme_debug (NULL, lvl, 3, func, NULL, NULL, "result=%zd", res);
+  else
+    _gpgme_debug (NULL, lvl, -1, NULL, NULL, NULL,
+                  "%s:%d: error: %s (%d)\n",
+                  func, line,  strerror (errno), errno);
+  _gpgme_debug_frame_end ();
+  return res;
+}
+
 /* Trace a system call error and return it.  */
 #define TRACE_SYSERR(rc) \
     _trace_syserr ((rc), _gpgme_trace_level, _gpgme_trace_func, __LINE__)