76 lines
3.4 KiB
C
76 lines
3.4 KiB
C
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/*-*- 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=8 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/calls/calls.h"
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#include "libc/mem/mem.h"
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#include "libc/stdio/stdio.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/o.h"
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static const char *fixpathname(const char *pathname, int flags) {
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if ((flags & O_ACCMODE) == O_RDONLY && strcmp(pathname, "-") == 0) {
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return "/dev/stdin";
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} else if ((flags & O_ACCMODE) == O_WRONLY && strcmp(pathname, "-") == 0) {
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return "/dev/stdout";
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} else {
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return pathname;
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}
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}
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static int openpathname(const char *pathname, int flags, bool *out_noclose) {
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if ((flags & O_ACCMODE) == O_RDONLY && strcmp(pathname, "/dev/stdin") == 0) {
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*out_noclose = true;
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return fileno(stdin);
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} else if ((flags & O_ACCMODE) == O_WRONLY &&
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strcmp(pathname, "/dev/stdout") == 0) {
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*out_noclose = true;
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return fileno(stdout);
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} else {
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*out_noclose = false;
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return open(pathname, flags, 0666);
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}
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}
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/**
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* Opens file as stream object.
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*
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* @param pathname is a utf-8 ideally relative filename
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* @param mode is the string mode/flag DSL see fopenflags()
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* @return new object to be free'd by fclose() or NULL w/ errno
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* @note microsoft unilaterally deprecated this function lool
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*/
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FILE *fopen(const char *pathname, const char *mode) {
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FILE *f;
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bool noclose;
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int fd, flags;
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flags = fopenflags(mode);
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pathname = fixpathname(pathname, flags);
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if ((fd = openpathname(pathname, flags, &noclose)) != -1) {
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if ((f = fdopen(fd, mode)) != NULL) {
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f->noclose = noclose;
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return f;
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} else {
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if (!noclose) close(fd);
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return NULL;
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}
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} else {
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return NULL;
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}
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}
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