56 lines
2.8 KiB
C
56 lines
2.8 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/bits/safemacros.h"
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#include "libc/calls/calls.h"
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#include "libc/limits.h"
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#include "libc/runtime/ezmap.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/prot.h"
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hidden int MapFileRead(const char *filename, struct MappedFile *mf) {
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mf->addr = MAP_FAILED;
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if ((mf->fd = open(filename, O_RDONLY)) != -1 &&
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(mf->size = getfiledescriptorsize(mf->fd)) < INT_MAX &&
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(mf->addr = mf->size ? mmap(NULL, mf->size, PROT_READ,
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MAP_PRIVATE | MAP_POPULATE, mf->fd, 0)
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: NULL) != MAP_FAILED) {
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return 0;
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} else {
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UnmapFile(mf);
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return -1;
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}
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}
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hidden int UnmapFile(struct MappedFile *mf) {
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int rc;
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rc = 0;
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if (mf->addr && mf->addr != MAP_FAILED) {
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rc |= munmap(mf->addr, mf->size);
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mf->addr = MAP_FAILED;
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}
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if (mf->fd != -1) {
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rc |= close(mf->fd);
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mf->fd = -1;
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}
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mf->size = 0;
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return rc;
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}
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