mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +00:00
d5910e2673
- Fixed bug where stdio eof wasn't being sticky - Fixed bug where fseeko() wasn't clearing eof state - Removed assert() usage from libc favoring _unassert() / _npassert()
55 lines
2.8 KiB
C
55 lines
2.8 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 2021 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/assert.h"
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#include "libc/dce.h"
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#include "libc/mem/mem.h"
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#include "libc/stdio/append.h"
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#define W sizeof(size_t)
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/**
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* Returns size of append buffer.
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*
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* @param p must be 0 or have been allocated by an append*() function
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* @return i is number of bytes stored in buffer
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* @return n is number of bytes in allocation
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*/
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struct appendz appendz(char *p) {
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struct appendz z;
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if (p) {
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z.n = malloc_usable_size(p);
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_unassert(z.n >= W * 2 && !(z.n & (W - 1)));
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z.i = *(size_t *)(p + z.n - W);
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if (!IsTiny() && W == 8) {
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/*
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* This check should fail if an append*() function was passed a
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* pointer that was allocated manually by malloc(). Append ptrs
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* can be free()'d safely, but they need to be allocated by the
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* append library, because we write a special value to the end.
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*/
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_unassert((z.i >> 48) == APPEND_COOKIE);
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z.i &= 0x0000ffffffffffff;
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}
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_unassert(z.n >= z.i);
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} else {
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z.i = 0;
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z.n = 0;
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}
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return z;
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}
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