mirror of
https://github.com/jart/cosmopolitan.git
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59 lines
2.6 KiB
C
59 lines
2.6 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/assert.h"
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#include "libc/fmt/fmt.h"
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#include "libc/mem/mem.h"
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/**
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* Formats string w/ dynamic memory allocation.
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* @see xasprintf() for a better API
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* @threadsafe
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*/
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int(vasprintf)(char **strp, const char *fmt, va_list va) {
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va_list vb;
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size_t size;
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char *p, *p2;
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int wrote, rc = -1;
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if ((p = malloc((size = 512)))) {
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va_copy(vb, va);
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wrote = (vsnprintf)(p, size, fmt, va);
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if (wrote < size) {
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if ((p2 = realloc(p, wrote + 1))) {
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p = p2;
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rc = wrote;
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}
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} else {
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size = wrote + 1;
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if ((p2 = realloc(p, size))) {
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p = p2;
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wrote = (vsnprintf)(p, size, fmt, vb);
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_unassert(wrote == size - 1);
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rc = wrote;
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}
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}
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va_end(vb);
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}
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if (rc != -1) {
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*strp = p;
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return rc;
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} else {
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return -1;
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}
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}
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