45 lines
2.6 KiB
C
45 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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│ 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/safemacros.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/struct/iovec.h"
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#include "libc/str/str.h"
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#include "libc/zipos/zipos.h"
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/**
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* Reads data from zip store object.
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*
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* @return [1..size] bytes on success, 0 on EOF, or -1 w/ errno; with
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* exception of size==0, in which case return zero means no error
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* @asyncsignalsafe
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*/
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ssize_t __zipos_read(struct ZiposHandle *h, const struct iovec *iov,
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size_t iovlen, ssize_t opt_offset) {
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size_t i, b, x, y;
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x = y = opt_offset != -1 ? opt_offset : h->pos;
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for (i = 0; i < iovlen && y < h->size; ++i, y += b) {
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b = min(iov[i].iov_len, h->size - y);
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memcpy(iov[i].iov_base, h->mem + y, b);
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}
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if (opt_offset == -1) h->pos = y;
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return y - x;
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}
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