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userspace/libc: implement alphasort, fdopendir, opendir, posix_getdents, readdir & scandir

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Signed-off-by: EnderIce2 <enderice2@protonmail.com>
This commit is contained in:
EnderIce2 2025-02-14 02:17:06 +02:00
parent d0a8d9dd62
commit 92ef18b412
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GPG Key ID: 2EE20AF089811A5A
2 changed files with 127 additions and 12 deletions
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12
Userspace/libc/include/dirent.h
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@ -58,16 +58,16 @@ extern "C"
#define DT_SHM
#define DT_TMO
int alphasort(const struct dirent **, const struct dirent **);
int alphasort(const struct dirent **d1, const struct dirent **d2);
int closedir(DIR *dirp);
int dirfd(DIR *dirp);
DIR *fdopendir(int);
DIR *opendir(const char *);
ssize_t posix_getdents(int, void *, size_t, int);
struct dirent *readdir(DIR *);
DIR *fdopendir(int fd);
DIR *opendir(const char *dirname);
ssize_t posix_getdents(int fildes, void *buf, size_t nbyte, int flags);
struct dirent *readdir(DIR *dirp);
int readdir_r(DIR *restrict, struct dirent *restrict, struct dirent **restrict);
void rewinddir(DIR *);
int scandir(const char *, struct dirent ***, int (*)(const struct dirent *), int (*)(const struct dirent **, const struct dirent **));
int scandir(const char *dir, struct dirent ***namelist, int (*sel)(const struct dirent *), int (*compar)(const struct dirent **, const struct dirent **));
void seekdir(DIR *, long);
long telldir(DIR *);

127
Userspace/libc/src/std/dirent.c
View File

@ -20,8 +20,13 @@
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
export int alphasort(const struct dirent **, const struct dirent **);
export int alphasort(const struct dirent **d1, const struct dirent **d2)
{
return strcoll((*d1)->d_name, (*d2)->d_name);
}
export int closedir(DIR *dirp)
{
@ -52,12 +57,122 @@ export int dirfd(DIR *dirp)
return __check_errno(-ENOSYS, -1);
}
export DIR *fdopendir(int);
export DIR *opendir(const char *);
export ssize_t posix_getdents(int, void *, size_t, int);
export struct dirent *readdir(DIR *);
export DIR *fdopendir(int fd)
{
DIR *dirp = malloc(sizeof(DIR));
if (dirp == NULL)
return NULL;
dirp->__fd = fd;
return dirp;
}
export DIR *opendir(const char *dirname)
{
DIR *dirp = malloc(sizeof(DIR));
if (dirp == NULL)
return NULL;
dirp->__fd = open(dirname, O_RDONLY);
if (dirp->__fd == -1)
{
free(dirp);
return NULL;
}
return dirp;
}
export ssize_t posix_getdents(int fildes, void *buf, size_t nbyte, int flags)
{
printf("posix_getdents() is unimplemented\n");
return __check_errno(-ENOSYS, -1);
}
export struct dirent *readdir(DIR *dirp)
{
if (!dirp)
{
errno = EBADF;
return NULL;
}
struct dirent *entry = malloc(sizeof(struct dirent));
if (entry == NULL)
return NULL;
ssize_t bytes = posix_getdents(dirp->__fd, entry, sizeof(struct dirent), 0);
if (bytes == -1)
{
free(entry);
return NULL;
}
return entry;
}
export int readdir_r(DIR *restrict, struct dirent *restrict, struct dirent **restrict);
export void rewinddir(DIR *);
export int scandir(const char *, struct dirent ***, int (*)(const struct dirent *), int (*)(const struct dirent **, const struct dirent **));
export int scandir(const char *dir, struct dirent ***namelist, int (*sel)(const struct dirent *), int (*compar)(const struct dirent **, const struct dirent **))
{
struct dirent **entry_list = NULL;
struct dirent *entry;
DIR *dp;
int count = 0;
int capacity = 10;
dp = opendir(dir);
if (dp == NULL)
return -1;
entry_list = malloc(capacity * sizeof(struct dirent *));
if (entry_list == NULL)
{
closedir(dp);
return -1;
}
while ((entry = readdir(dp)) != NULL)
{
if (sel == NULL || sel(entry))
{
if (count >= capacity)
{
capacity *= 2;
struct dirent **new_list = realloc(entry_list, capacity * sizeof(struct dirent *));
if (new_list == NULL)
{
for (int i = 0; i < count; i++)
free(entry_list[i]);
free(entry_list);
closedir(dp);
return -1;
}
entry_list = new_list;
}
entry_list[count] = malloc(sizeof(struct dirent));
if (entry_list[count] == NULL)
{
for (int i = 0; i < count; i++)
free(entry_list[i]);
free(entry_list);
closedir(dp);
return -1;
}
memcpy(entry_list[count], entry, sizeof(struct dirent));
count++;
}
}
closedir(dp);
if (count > 0)
qsort(entry_list, count, sizeof(struct dirent *), (int (*)(const void *, const void *))compar);
*namelist = entry_list;
return count;
}
export void seekdir(DIR *, long);
export long telldir(DIR *);