54 lines
2.7 KiB
C
54 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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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/str/str.h"
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#include "tool/build/lib/iovs.h"
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/**
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* Appends memory region to i/o vector builder.
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*/
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int AppendIovs(struct Iovs *ib, void *base, size_t len) {
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unsigned i, n;
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struct iovec *p;
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if (len) {
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p = ib->p;
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i = ib->i;
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n = ib->n;
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if (i && (intptr_t)base == (intptr_t)p[i - 1].iov_base + p[i - 1].iov_len) {
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p[i - 1].iov_len += len;
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} else {
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if (unlikely(i == n)) {
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n += n >> 1;
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if (p == ib->init) {
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if (!(p = malloc(sizeof(struct iovec) * n))) return -1;
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memcpy(p, ib->init, sizeof(ib->init));
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} else {
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if (!(p = realloc(p, sizeof(struct iovec) * n))) return -1;
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}
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ib->p = p;
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ib->n = n;
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}
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p[i].iov_base = base;
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p[i].iov_len = len;
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++ib->i;
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}
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}
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return 0;
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}
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