72 lines
2.7 KiB
C
72 lines
2.7 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/bits/popcnt.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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#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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* @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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*/
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FILE *fmemopen(void *buf, size_t size, const char *mode) {
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FILE *f;
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char *p;
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unsigned flags;
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if (size && size > 0x7ffff000) {
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einval();
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return NULL;
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}
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if (!(f = 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 = BUFSIZ;
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if (!(buf = calloc(1, size))) {
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free(f);
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return NULL;
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}
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} else {
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f->nofree = true;
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}
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f->fd = -1;
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f->buf = buf;
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f->size = size;
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f->end = size;
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f->iomode = fopenflags(mode);
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if (f->iomode & O_APPEND) {
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if ((p = memchr(buf, '\0', size))) {
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f->beg = p - (char *)buf;
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} else {
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f->beg = f->end;
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}
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}
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return f;
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}
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