mirror of
https://github.com/jart/cosmopolitan.git
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62 lines
2.8 KiB
C
62 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/fmt/fmt.h"
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#include "libc/macros.internal.h"
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#include "libc/mem/mem.h"
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#include "libc/stdio/append.internal.h"
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#define W sizeof(size_t)
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/**
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* Appends formatted string to buffer.
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*/
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ssize_t(vappendf)(char **b, const char *f, va_list v) {
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char *p;
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int r, s;
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size_t n;
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va_list w;
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struct appendz z;
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z = appendz((p = *b));
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va_copy(w, v);
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if ((r = (vsnprintf)(p + z.i, z.n ? z.n - W - z.i : 0, f, v)) >= 0) {
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n = ROUNDUP(z.i + r + 1, 8) + W;
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if (n > z.n) {
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if (!z.n) z.n = W * 2;
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while (n > z.n) z.n += z.n >> 1;
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z.n = ROUNDUP(z.n, W);
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if ((p = realloc(p, z.n))) {
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z.n = malloc_usable_size(p);
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assert(!(z.n & (W - 1)));
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s = (vsnprintf)(p + z.i, z.n - W - z.i, f, w);
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assert(s == r);
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*b = p;
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} else {
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va_end(w);
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return -1;
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}
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}
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z.i += r;
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if (!IsTiny() && W == 8) z.i |= (size_t)APPEND_COOKIE << 48;
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*(size_t *)(p + z.n - W) = z.i;
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}
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va_end(w);
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return r;
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}
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