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v/vlib/os/fd.c.v
2021-02-14 19:31:42 +01:00

50 lines
879 B
V

module os
// file descriptor based operations:
// close filedescriptor
pub fn fd_close(fd int) int {
return C.close(fd)
}
pub fn fd_write(fd int, s string) {
mut sp := s.str
mut remaining := s.len
for remaining > 0 {
written := C.write(fd, sp, remaining)
if written < 0 {
return
}
remaining = remaining - written
sp = unsafe { sp + written }
}
}
// read from filedescriptor, block until data
pub fn fd_slurp(fd int) []string {
mut res := []string{}
for {
s, b := fd_read(fd, 4096)
if b <= 0 {
break
}
res << s
}
return res
}
// read from filedescriptor, don't block
// return [bytestring,nrbytes]
pub fn fd_read(fd int, maxbytes int) (string, int) {
unsafe {
mut buf := malloc(maxbytes)
nbytes := C.read(fd, buf, maxbytes)
if nbytes < 0 {
free(buf)
return '', nbytes
}
buf[nbytes] = 0
return tos(buf, nbytes), nbytes
}
}