62 lines
1019 B
V
62 lines
1019 B
V
module os
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// file descriptor based operations:
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// close filedescriptor
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pub fn fd_close(fd int) int {
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if fd == -1 {
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return 0
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}
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return C.close(fd)
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}
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pub fn fd_write(fd int, s string) {
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if fd == -1 {
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return
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}
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mut sp := s.str
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mut remaining := s.len
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for remaining > 0 {
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written := C.write(fd, sp, remaining)
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if written < 0 {
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return
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}
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remaining = remaining - written
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sp = unsafe { voidptr(sp + written) }
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}
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}
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// read from filedescriptor, block until data
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pub fn fd_slurp(fd int) []string {
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mut res := []string{}
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if fd == -1 {
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return res
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}
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for {
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s, b := fd_read(fd, 4096)
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if b <= 0 {
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break
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}
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res << s
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}
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return res
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}
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// read from filedescriptor, don't block
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// return [bytestring,nrbytes]
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pub fn fd_read(fd int, maxbytes int) (string, int) {
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if fd == -1 {
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return '', 0
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}
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unsafe {
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mut buf := malloc_noscan(maxbytes + 1)
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nbytes := C.read(fd, buf, maxbytes)
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if nbytes < 0 {
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free(buf)
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return '', nbytes
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}
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buf[nbytes] = 0
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return tos(buf, nbytes), nbytes
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}
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}
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