Remove use of ssize_t from library API

ssize_t is only available on POSIX platforms and even there it is
only defined to hold at least -1 in the range of negative numbers.

This commit replaces ssize_t return types with sqfs_s32 and the
coresponding function arguments with sqfs_u32. Because the range
of positiv numbers for a signed 32 bit number is only half that of
the unsigned version, additional checks have to be added.

Signed-off-by: David Oberhollenzer <david.oberhollenzer@sigma-star.at>

1 files changed, 4 insertions, 4 deletions

diff --git a/include/sqfs/data_reader.h b/include/sqfs/data_reader.h
index f41abeb..bf29417 100644
--- a/include/sqfs/data_reader.h
+++ b/include/sqfs/data_reader.h
@@ -140,10 +140,10 @@ SQFS_API int sqfs_data_reader_get_block(sqfs_data_reader_t *data,
  *         past the end of the file and a negative @ref E_SQFS_ERROR value
  *         on failure.
  */
-SQFS_API ssize_t sqfs_data_reader_read(sqfs_data_reader_t *data,
-				       const sqfs_inode_generic_t *inode,
-				       sqfs_u64 offset, void *buffer,
-				       size_t size);
+SQFS_API sqfs_s32 sqfs_data_reader_read(sqfs_data_reader_t *data,
+					const sqfs_inode_generic_t *inode,
+					sqfs_u64 offset, void *buffer,
+					sqfs_u32 size);
 
 #ifdef __cplusplus
 }