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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/mem/mem.h"
#include "libc/stdio/stdio.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/o.h"
#include "libc/sysv/errfuns.h"
/**
* Opens buffer as stream.
*
* @param buf becomes owned by this function, and is allocated if NULL
* @return new stream or NULL w/ errno
*/
FILE *fmemopen(void *buf, size_t size, const char *mode) {
FILE *f;
char *p;
unsigned flags;
if (size && size > 0x7ffff000) {
einval();
return NULL;
}
if (!(f = calloc(1, sizeof(FILE)))) {
return NULL;
}
if (buf) {
f->nofree = true;
} else {
if (!size) size = BUFSIZ;
if (!(buf = calloc(1, size))) {
free(f);
return NULL;
}
}
f->fd = -1;
f->buf = buf;
f->end = size;
f->size = size;
f->iomode = fopenflags(mode);
if (f->iomode & O_APPEND) {
if ((p = memchr(buf, '\0', size))) {
f->beg = p - (char *)buf;
} else {
f->beg = f->end;
}
}
return f;
}
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