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VFS: Implement pread() and pwrite()

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Closes https://github.com/espressif/esp-idf/issues/3515
This commit is contained in:
Roland Dobai
2019-07-01 11:08:57 +02:00
committed by bot
parent 1ea68e6093
commit 41062bea99
10 changed files with 307 additions and 0 deletions
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27
components/vfs/vfs.c
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@@ -447,6 +447,33 @@ ssize_t esp_vfs_read(struct _reent *r, int fd, void * dst, size_t size)
return ret;
}
ssize_t esp_vfs_pread(int fd, void *dst, size_t size, off_t offset)
{
struct _reent *r = __getreent();
const vfs_entry_t* vfs = get_vfs_for_fd(fd);
const int local_fd = get_local_fd(vfs, fd);
if (vfs == NULL || local_fd < 0) {
__errno_r(r) = EBADF;
return -1;
}
ssize_t ret;
CHECK_AND_CALL(ret, r, vfs, pread, local_fd, dst, size, offset);
return ret;
}
ssize_t esp_vfs_pwrite(int fd, const void *src, size_t size, off_t offset)
{
struct _reent *r = __getreent();
const vfs_entry_t* vfs = get_vfs_for_fd(fd);
const int local_fd = get_local_fd(vfs, fd);
if (vfs == NULL || local_fd < 0) {
__errno_r(r) = EBADF;
return -1;
}
ssize_t ret;
CHECK_AND_CALL(ret, r, vfs, pwrite, local_fd, src, size, offset);
return ret;
}
int esp_vfs_close(struct _reent *r, int fd)
{