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boot loader: Add pwrite(), lseek(), ftruncate() 

ftruncate() is just a stub (needed for BFdIO).
This commit is contained in:
Ingo Weinhold 2014-07-12 13:27:11 +02:00
parent c55a06055f
commit 01e6d687c0
1 changed files with 62 additions and 0 deletions
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62
src/system/boot/loader/vfs.cpp
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@ -57,6 +57,7 @@ class Descriptor {
ssize_t Write(const void *buffer, size_t bufferSize);
void Stat(struct stat &stat);
status_t Seek(off_t position, int mode);
off_t Offset() const { return fOffset; }
int32 RefCount() const { return fRefCount; }
@ -391,6 +392,37 @@ Descriptor::Stat(struct stat &stat)
}
status_t
Descriptor::Seek(off_t position, int mode)
{
off_t newPosition;
switch (mode)
{
case SEEK_SET:
newPosition = position;
break;
case SEEK_CUR:
newPosition = fOffset + position;
break;
case SEEK_END:
{
struct stat st;
Stat(st);
newPosition = st.st_size + position;
break;
}
default:
return B_BAD_VALUE;
}
if (newPosition < 0)
return B_BAD_VALUE;
fOffset = newPosition;
return B_OK;
}
status_t
Descriptor::Acquire()
{
@ -866,6 +898,29 @@ dup(int fd)
}
off_t
lseek(int fd, off_t offset, int whence)
{
Descriptor* descriptor = get_descriptor(fd);
if (descriptor == NULL)
RETURN_AND_SET_ERRNO(B_FILE_ERROR);
status_t error = descriptor->Seek(offset, whence);
if (error != B_OK)
RETURN_AND_SET_ERRNO(B_FILE_ERROR);
return descriptor->Offset();
}
int
ftruncate(int fd, off_t newSize)
{
dprintf("ftruncate() not implemented!\n");
RETURN_AND_SET_ERRNO(B_FILE_ERROR);
}
ssize_t
read_pos(int fd, off_t offset, void *buffer, size_t bufferSize)
{
@ -906,6 +961,13 @@ write_pos(int fd, off_t offset, const void *buffer, size_t bufferSize)
}
ssize_t
pwrite(int fd, const void* buffer, size_t bufferSize, off_t offset)
{
return write_pos(fd, offset, buffer, bufferSize);
}
ssize_t
write(int fd, const void *buffer, size_t bufferSize)
{