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correct largefile support, add comments about it.

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This commit is contained in:
Denis Vlasenko
2006-10-08 17:54:47 +00:00
parent 1385899416
commit 7039a66b58
15 changed files with 121 additions and 91 deletions
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70
include/libbb.h
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@@ -61,30 +61,56 @@
#define PATH_MAX 256
#endif
/* Not (yet) used, but tested to work correctly
#define MAXINT(T) (T)( \
((T)-1) > 0 \
? (T)-1 \
: (T)~((T)1 << (sizeof(T)*8-1)) \
)
#define MININT(T) (T)( \
((T)-1) > 0 \
? (T)0 \
: ((T)1 << (sizeof(T)*8-1)) \
)
*/
/* Large file support */
#ifdef CONFIG_LFS
# define FILEOFF_TYPE off64_t
# define FILEOFF_FMT "%lld"
# define LSEEK lseek64
# define STAT stat64
# define LSTAT lstat64
# define STRUCT_STAT struct stat64
# define STRTOOFF strtoll
# define SAFE_STRTOOFF safe_strtoll
/* Note that CONFIG_LFS forces bbox to be built with all common ops
* (stat, lseek etc) mapped to "largefile" variants by libc.
* Practically it means that open() automatically has O_LARGEFILE added
* and all filesize/file_offset parameters and struct members are "large"
* (in today's world - signed 64bit). For full support of large files,
* we need a few helper #defines (below) and careful use of off_t
* instead of int/ssize_t. No lseek64(), O_LARGEFILE etc necessary */
#if ENBALE_LFS
/* CONFIG_LFS is on */
# if ULONG_MAX > 0xffffffff
/* "long" is long enough on this system */
# define STRTOOFF strtol
# define SAFE_STRTOOFF safe_strtol
# define OFF_FMT "%ld"
# else
/* "long" is too short, need "lomg long" */
# define STRTOOFF strtoll
# define SAFE_STRTOOFF safe_strtoll
# define OFF_FMT "%lld"
# endif
#else
# define FILEOFF_TYPE off_t
# define FILEOFF_FMT "%ld"
# define LSEEK lseek
# define STAT stat
# define LSTAT lstat
# define STRUCT_STAT struct stat
# define STRTOOFF strtol
# define SAFE_STRTOOFF safe_strtol
/* Do we need to undefine O_LARGEFILE? */
# if 0 /* UINT_MAX == 0xffffffff */
/* Doesn't work. off_t is a long. gcc will throw warnings on printf("%d", off_t)
* even if long==int on this arch. Crap... */
# define STRTOOFF strtol
# define SAFE_STRTOOFF safe_strtoi
# define OFF_FMT "%d"
# else
# define STRTOOFF strtol
# define SAFE_STRTOOFF safe_strtol
# define OFF_FMT "%ld"
# endif
#endif
/* scary. better ideas? (but do *test* them first!) */
#define MAX_FILEOFF_TYPE \
((FILEOFF_TYPE)~((FILEOFF_TYPE)1 << (sizeof(FILEOFF_TYPE)*8-1)))
#define OFF_T_MAX ((off_t)~((off_t)1 << (sizeof(off_t)*8-1)))
/* Some useful definitions */
#undef FALSE
@@ -203,8 +229,8 @@ extern char *find_block_device(char *path);
extern char *bb_get_line_from_file(FILE *file);
extern char *bb_get_chomped_line_from_file(FILE *file);
extern char *bb_get_chunk_from_file(FILE *file, int *end);
extern int bb_copyfd_size(int fd1, int fd2, const off_t size);
extern int bb_copyfd_eof(int fd1, int fd2);
extern off_t bb_copyfd_size(int fd1, int fd2, off_t size);
extern off_t bb_copyfd_eof(int fd1, int fd2);
extern char bb_process_escape_sequence(const char **ptr);
extern char *bb_get_last_path_component(char *path);
extern FILE *bb_wfopen(const char *path, const char *mode);