77 lines
3.1 KiB
C
77 lines
3.1 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/bits.h"
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#include "libc/bits/popcnt.h"
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#include "libc/calls/calls.h"
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#include "libc/errno.h"
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#include "libc/mem/mem.h"
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#include "libc/runtime/runtime.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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#include "libc/sysv/errfuns.h"
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/**
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* Opens buffer as stream.
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*
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* This function is the heart of the streams implementation, and it's
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* truly magnificent for unit testing.
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*
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* @param buf becomes owned by this function, and is allocated if NULL
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* @return new stream or NULL w/ errno
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* @error ENOMEM, EINVAL
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*/
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FILE *fmemopen(void *buf, size_t size, const char *mode) {
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FILE *res;
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unsigned flags;
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if (buf && !size) {
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einval();
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return NULL;
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}
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if (size && popcnt(size) != 1) {
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einval();
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return NULL;
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}
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if (!(res = calloc(1, sizeof(FILE)))) {
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return NULL;
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}
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if (!buf) {
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if (!size) size = FRAMESIZE;
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if (!(buf = valloc(size))) {
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free(res);
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return NULL;
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}
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}
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res->fd = -1;
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setbuffer(res, buf, size);
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res->bufmode = res->buf ? _IOFBF : _IONBF;
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flags = fopenflags(mode);
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res->iomode = (flags & O_ACCMODE) == O_RDWR
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? O_RDWR
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: (flags & O_ACCMODE) == O_WRONLY ? O_WRONLY : O_RDONLY;
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return res;
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}
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