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libs/libc/dirent/: Added alphasort, scandir and DT_* defines

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- Added an alphasort implementation
- Added a scandir implementation
- Added DT_* literals to include/dirent.h: Apparently those are not required by POSIX, but are part of 4.3BSD and available in glibc as well.
This commit is contained in:
Michael Jung
2019-07-31 07:53:14 -06:00
committed by Gregory Nutt
parent d1afc02c50
commit ded8711261
4 changed files with 340 additions and 6 deletions
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include/dirent.h
+32 -5
View File
@@ -50,9 +50,9 @@
* Pre-processor Definitions
****************************************************************************/
/* File type code for the d_type field in dirent struct.
* Note that because of the simplified filesystem organization
* of NuttX, an inode can be BOTH a file and a directory
/* File type code for the d_type field in dirent structure.
* Note that because of the simplified filesystem organization of the NuttX,
* top-level, pseudo-file system, an inode can be BOTH a file and a directory
*/
#define DTYPE_UNKNOWN 0 /* The file type could not be determined */
@@ -61,6 +61,8 @@
#define DTYPE_BLK (1 << 2) /* Bit 2: Block device */
#define DTYPE_DIRECTORY (1 << 3) /* Bit 3: Directory */
#define DTYPE_LINK (1 << 4) /* Bit 4: Symbolic link */
#define DTYPE_FIFO (1 << 5) /* Bit 5: Named Pipe (FIFO) */
#define DTYPE_SOCK (1 << 6) /* Bit 6: UNIX domain socket */
#define DIRENT_ISFILE(dtype) (((dtype) & DTYPE_FILE) != 0)
#define DIRENT_ISCHR(dtype) (((dtype) & DTYPE_CHR) != 0)
@@ -68,6 +70,22 @@
#define DIRENT_ISDIRECTORY(dtype) (((dtype) & DTYPE_DIRECTORY) != 0)
#define DIRENT_ISLINK(dtype) (((dtype) & DTYPE_LINK) != 0)
/* The d_type field of the dirent structure is not specified by POSIX. It
* is a non-standard, 4.5BSD extension that is implemented by most OSs. A
* POSIX compliant OS may not implement the d_type field at all. Many OS's
* (including glibc) may use the following alternative naming for the file
* type names:
*/
#define DT_UNKNOWN DTYPE_UNKNOWN
#define DT_FIFO DTYPE_FIFO
#define DT_CHR DTYPE_CHR
#define DT_DIR DTYPE_DIRECTORY
#define DT_BLK DTYPE_BLK
#define DT_REG DTYPE_FILE
#define DT_LNK DTYPE_LINK
#define DT_SOCK DTYPE_SOCK
/****************************************************************************
* Public Type Definitions
****************************************************************************/
@@ -75,12 +93,15 @@
/* The POSIX specification requires that the caller of readdir_r provide
* storage "large enough for a dirent with the d_name member and an array
* of char containing at least {NAME_MAX} plus one elements.
*
* POSIX also requires the field d_ino (type ino_t) that provides the file
* serial number. This functionality is not implemented in NuttX.
*/
struct dirent
{
uint8_t d_type; /* type of file */
char d_name[NAME_MAX+1]; /* filename */
uint8_t d_type; /* Type of file */
char d_name[NAME_MAX + 1]; /* File name */
};
typedef void DIR;
@@ -112,6 +133,12 @@ int readdir_r(FAR DIR *dirp, FAR struct dirent *entry,
void rewinddir(FAR DIR *dirp);
void seekdir(FAR DIR *dirp, off_t loc);
off_t telldir(FAR DIR *dirp);
int scandir(FAR const char *path, FAR struct dirent ***namelist,
CODE int (*filter)(FAR const struct dirent *),
CODE int (*compar)(FAR const struct dirent **,
FAR const struct dirent **));
int alphasort(FAR const struct dirent **a,
FAR const struct dirent **b);
#undef EXTERN
#if defined(__cplusplus)