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Simplify Long File Support in cenv.h

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because it is always detected by configure, so the OS-specific cases
do never apply.
This commit is contained in:
Olaf Seibert
2021-08-19 16:28:03 +02:00
parent 6b892819c0
commit 57c5616e51
1 changed files with 13 additions and 60 deletions
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73
src/cenv.h
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@@ -180,71 +180,24 @@
/* Large File Support (LFS)
* See <http://ftp.sas.com/standards/large.file/x_open.20Mar96.html>
*
* DECOSF: default 64-bit (no macros); fseek 64-bit; no fseeko.
* FREEBSD: default 64-bit (no macros); fseek 32-bit; has fseeko.
* LINUX: default 32-bit (need macro); fseek 32-bit; has fseeko (need macro).
* SOLARIS: default 32-bit (need macro); fseek 32-bit; has fseeko (need macro).
* NETBSD: default 64-bit (no macros); fseek 32-bit; has fseeko.
* MAC/OTH: ? Assume 32-bit OS only, 64 not possible.
* SIZEOF_OFF_T is discovered by configure, so the other defines
* can be based on it. Configure also makes sure that _FILE_OFFSET_BITS and
* _LARGE_FILES are defined when needed.
*/
#ifndef CENV_SYSF_LFS /* Predefining this must predefine the rest */
# if defined(SIZEOF_OFF_T) /* system inspected by configure */
# if SIZEOF_OFF_T == 0 || SIZEOF_OFF_T == 4
# define CENV_SYSF_LFS 0 /* No off_t, use long */
# define CENV_SYSF_LFS_FMT "l" /* printf format is signed long */
# elif SIZEOF_OFF_T == 8
# define CENV_SYSF_LFS 64 /* off_t exists and has 64 bits */
# if SIZEOF_OFF_T == SIZEOF_LONG
# define CENV_SYSF_LFS_FMT "l" /* printf format is signed long */
# elif SIZEOF_OFF_T == SIZEOF_LONG_LONG
# define CENV_SYSF_LFS_FMT "ll" /* printf format is signed long long */
# endif
# endif
# define CENV_SYSF_FSEEKO HAVE_FSEEKO
/* FreeBSD defaults to 64-bit file off_t but calls the type "quad_t"
* instead of "long long". Always has fseeko.
*/
# elif CENV_SYS_FREEBSD
# define CENV_SYSF_LFS 64 /* off_t exists and has 64 bits */
# define CENV_SYSF_FSEEKO 1 /* And have some flavor of fseeko */
# define CENV_SYSF_LFS_FMT "q" /* printf format is quad_t */
/* Alpha OSF/DU/Tru64 use 64-bit longs
*/
# elif CENV_SYS_DECOSF
# define CENV_SYSF_LFS 64 /* off_t exists and has 64 bits */
# define CENV_SYSF_FSEEKO 1 /* And have some flavor of fseeko */
# define fseeko fseek /* off_t == long and no fseeko */
# define CENV_SYSF_LFS_FMT "l" /* printf format is long */
/* Solaris/Linux do not default to 64-bit; must define these macros
* and make sure cenv.h comes before any other include files.
*/
# elif CENV_SYS_SOLARIS|CENV_SYS_LINUX
# define CENV_SYSF_LFS 64 /* off_t exists and has 64 bits */
# define CENV_SYSF_FSEEKO 1 /* And have some flavor of fseeko */
# ifndef _FILE_OFFSET_BITS
# define _FILE_OFFSET_BITS 64 /* Use 64-bit file ops */
# endif
# ifndef _LARGEFILE_SOURCE
# define _LARGEFILE_SOURCE /* Include fseeko, ftello, etc */
# endif
# define CENV_SYSF_LFS_FMT "ll" /* printf format is long long */
/* Unknown system, but check for existence of standard macros */
# elif _FILE_OFFSET_BITS >= 64
# define CENV_SYSF_LFS _FILE_OFFSET_BITS /* Assume off_t exists */
# define CENV_SYSF_FSEEKO 1 /* Also assume fseeko */
# define CENV_SYSF_LFS_FMT "ll" /* printf fmt probably (!) long long */
/* Out of luck, using plain old longs (likely 32-bit) */
# else
# if SIZEOF_OFF_T == 0 || SIZEOF_OFF_T == 4
# define CENV_SYSF_LFS 0 /* No off_t, use long */
# define CENV_SYSF_FSEEKO 0 /* No fseeko (irrelevant) */
# define CENV_SYSF_LFS_FMT "l" /* printf format is long */
# define CENV_SYSF_LFS_FMT "l" /* printf format is signed long */
# elif SIZEOF_OFF_T == 8
# define CENV_SYSF_LFS 64 /* off_t exists and has 64 bits */
# if SIZEOF_OFF_T == SIZEOF_LONG
# define CENV_SYSF_LFS_FMT "l" /* printf format is signed long */
# elif SIZEOF_OFF_T == SIZEOF_LONG_LONG
# define CENV_SYSF_LFS_FMT "ll" /* printf format is signed long long */
# endif
# endif
# define CENV_SYSF_FSEEKO HAVE_FSEEKO
#endif /* ifndef CENV_SYSF_LFS */