64 lines
2.9 KiB
C
64 lines
2.9 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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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.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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/**
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* Memory-maps file for reading.
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* An internal veneer for a common mmap() use-case.
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*/
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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
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? mmap(NULL, mf->size, PROT_READ, MAP_SHARED, 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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/**
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* Releases resource returned by mapfileread().
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*/
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int unmapfile(struct MappedFile *mf) {
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int rc;
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rc = 0;
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if (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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