diff options
Diffstat (limited to 'gnulib/import/filename.h')
| -rw-r--r-- | gnulib/import/filename.h | 88 |
1 files changed, 72 insertions, 16 deletions
diff --git a/gnulib/import/filename.h b/gnulib/import/filename.h index d4c70203e66..4598fb1d638 100644 --- a/gnulib/import/filename.h +++ b/gnulib/import/filename.h @@ -14,38 +14,94 @@ You should have received a copy of the GNU General Public License along with this program. If not, see <https://www.gnu.org/licenses/>. */ +/* From Paul Eggert and Jim Meyering. */ + #ifndef _FILENAME_H #define _FILENAME_H +#include <string.h> + #ifdef __cplusplus extern "C" { #endif -/* Pathname support. - ISSLASH(C) tests whether C is a directory separator character. - IS_ABSOLUTE_PATH(P) tests whether P is an absolute path. If it is not, - it may be concatenated to a directory pathname. - IS_PATH_WITH_DIR(P) tests whether P contains a directory specification. +/* Filename support. + ISSLASH(C) tests whether C is a directory separator + character. + HAS_DEVICE(Filename) tests whether Filename contains a device + specification. + FILE_SYSTEM_PREFIX_LEN(Filename) length of the device specification + at the beginning of Filename, + index of the part consisting of + alternating components and slashes. + FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE + 1 when a non-empty device specification + can be followed by an empty or relative + part, + 0 when a non-empty device specification + must be followed by a slash, + 0 when device specification don't exist. + IS_ABSOLUTE_FILE_NAME(Filename) + tests whether Filename is independent of + any notion of "current directory". + IS_RELATIVE_FILE_NAME(Filename) + tests whether Filename may be concatenated + to a directory filename. + Note: On native Windows, OS/2, DOS, "c:" is neither an absolute nor a + relative file name! + IS_FILE_NAME_WITH_DIR(Filename) tests whether Filename contains a device + or directory specification. */ -#if defined _WIN32 || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__ +#if defined _WIN32 || defined __CYGWIN__ \ + || defined __EMX__ || defined __MSDOS__ || defined __DJGPP__ /* Native Windows, Cygwin, OS/2, DOS */ # define ISSLASH(C) ((C) == '/' || (C) == '\\') -# define HAS_DEVICE(P) \ - ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \ - && (P)[1] == ':') -# define IS_ABSOLUTE_PATH(P) (ISSLASH ((P)[0]) || HAS_DEVICE (P)) -# define IS_PATH_WITH_DIR(P) \ - (strchr (P, '/') != NULL || strchr (P, '\\') != NULL || HAS_DEVICE (P)) -# define FILE_SYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0) + /* Internal macro: Tests whether a character is a drive letter. */ +# define _IS_DRIVE_LETTER(C) \ + (((C) >= 'A' && (C) <= 'Z') || ((C) >= 'a' && (C) <= 'z')) + /* Help the compiler optimizing it. This assumes ASCII. */ +# undef _IS_DRIVE_LETTER +# define _IS_DRIVE_LETTER(C) \ + (((unsigned int) (C) | ('a' - 'A')) - 'a' <= 'z' - 'a') +# define HAS_DEVICE(Filename) \ + (_IS_DRIVE_LETTER ((Filename)[0]) && (Filename)[1] == ':') +# define FILE_SYSTEM_PREFIX_LEN(Filename) (HAS_DEVICE (Filename) ? 2 : 0) +# ifdef __CYGWIN__ +# define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0 +# else + /* On native Windows, OS/2, DOS, the system has the notion of a + "current directory" on each drive. */ +# define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 1 +# endif +# if FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE +# define IS_ABSOLUTE_FILE_NAME(Filename) \ + ISSLASH ((Filename)[FILE_SYSTEM_PREFIX_LEN (Filename)]) +# else +# define IS_ABSOLUTE_FILE_NAME(Filename) \ + (ISSLASH ((Filename)[0]) || HAS_DEVICE (Filename)) +# endif +# define IS_RELATIVE_FILE_NAME(Filename) \ + (! (ISSLASH ((Filename)[0]) || HAS_DEVICE (Filename))) +# define IS_FILE_NAME_WITH_DIR(Filename) \ + (strchr ((Filename), '/') != NULL || strchr ((Filename), '\\') != NULL \ + || HAS_DEVICE (Filename)) #else /* Unix */ # define ISSLASH(C) ((C) == '/') -# define IS_ABSOLUTE_PATH(P) ISSLASH ((P)[0]) -# define IS_PATH_WITH_DIR(P) (strchr (P, '/') != NULL) -# define FILE_SYSTEM_PREFIX_LEN(P) 0 +# define HAS_DEVICE(Filename) ((void) (Filename), 0) +# define FILE_SYSTEM_PREFIX_LEN(Filename) ((void) (Filename), 0) +# define FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE 0 +# define IS_ABSOLUTE_FILE_NAME(Filename) ISSLASH ((Filename)[0]) +# define IS_RELATIVE_FILE_NAME(Filename) (! ISSLASH ((Filename)[0])) +# define IS_FILE_NAME_WITH_DIR(Filename) (strchr ((Filename), '/') != NULL) #endif +/* Deprecated macros. For backward compatibility with old users of the + 'filename' module. */ +#define IS_ABSOLUTE_PATH IS_ABSOLUTE_FILE_NAME +#define IS_PATH_WITH_DIR IS_FILE_NAME_WITH_DIR + #ifdef __cplusplus } |