mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
90 lines
3.7 KiB
C
90 lines
3.7 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/metalfile.internal.h"
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#include "libc/calls/struct/metastat.internal.h"
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#include "libc/calls/struct/stat.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/limits.h"
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#include "libc/nt/enum/fileinfobyhandleclass.h"
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#include "libc/nt/files.h"
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#include "libc/nt/struct/filestandardinformation.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/zipos/zipos.internal.h"
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/**
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* Determines size of open file.
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*
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* This function is equivalent to:
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*
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* struct stat st;
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* !fstat(fd, &st) ? st.st_size : -1
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*
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* Except faster on BSD/Windows and a much smaller link size.
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*
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* @return file byte length, or -1 w/ errno
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* @asyncsignalsafe
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*/
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ssize_t getfiledescriptorsize(int fd) {
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int e;
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ssize_t rc;
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union metastat st;
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struct NtFileStandardInformation info;
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e = errno;
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if (__isfdkind(fd, kFdZip)) {
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if (_weaken(__zipos_fstat)(
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(struct ZiposHandle *)(intptr_t)g_fds.p[fd].handle, &st.cosmo) !=
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-1) {
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rc = st.cosmo.st_size;
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} else {
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rc = -1;
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}
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} else if (IsMetal()) {
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if (fd < 0 || fd >= g_fds.n) {
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rc = ebadf();
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} else if (g_fds.p[fd].kind != kFdFile) {
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rc = eacces();
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} else {
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struct MetalFile *state = (struct MetalFile *)g_fds.p[fd].handle;
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rc = state->size;
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}
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} else if (!IsWindows()) {
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if (!__sys_fstat(fd, &st)) {
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rc = METASTAT(st, st_size);
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} else {
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rc = -1;
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}
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} else if (__isfdopen(fd)) {
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if (GetFileInformationByHandleEx(g_fds.p[fd].handle, kNtFileStandardInfo,
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&info, sizeof(info))) {
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rc = info.EndOfFile;
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} else {
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rc = ebadf();
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}
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} else {
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rc = ebadf();
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}
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STRACE("getfiledescriptorsize(%d) → %'zd% m", fd, rc);
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return rc;
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}
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