47 lines
2.5 KiB
C
47 lines
2.5 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/assert.h"
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#include "libc/bits/weaken.h"
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#include "libc/calls/internal.h"
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#include "libc/mem/mem.h"
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#include "libc/sysv/errfuns.h"
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int __ensurefds(int fd) {
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size_t i, n;
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struct Fd *p;
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if (fd < g_fds.n) return fd;
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if (weaken(realloc)) {
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if ((p = weaken(realloc)(
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g_fds.p != g_fds.__init_p ? g_fds.p : NULL,
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(n = MAX(fd + 1, (i = g_fds.n) << 1)) * sizeof(*p)))) {
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do {
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p[i++].kind = kFdEmpty;
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} while (i < n);
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g_fds.p = p;
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g_fds.n = n;
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return fd;
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} else {
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return enomem();
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}
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} else {
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return emfile();
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}
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}
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