59 lines
1.0 KiB
C
59 lines
1.0 KiB
C
/*
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* This file is part of the UCB release of Plan 9. It is subject to the license
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* terms in the LICENSE file found in the top-level directory of this
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* distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
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* part of the UCB release of Plan 9, including this file, may be copied,
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* modified, propagated, or distributed except according to the terms contained
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* in the LICENSE file.
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*/
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#include <u.h>
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#include <libc.h>
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static
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int32_t
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ioreadv(int fd, IOchunk *io, int nio, int64_t offset)
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{
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int i;
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int32_t m, n, tot;
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char *buf, *p;
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tot = 0;
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for(i=0; i<nio; i++)
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tot += io[i].len;
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buf = malloc(tot);
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if(buf == nil)
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return -1;
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tot = pread(fd, buf, tot, offset);
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p = buf;
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n = tot;
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for(i=0; i<nio; i++){
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if(n <= 0)
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break;
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m = io->len;
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if(m > n)
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m = n;
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memmove(io->addr, p, m);
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n -= m;
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p += m;
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io++;
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}
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free(buf);
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return tot;
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}
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int32_t
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readv(int fd, IOchunk *io, int nio)
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{
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return ioreadv(fd, io, nio, -1LL);
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}
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int32_t
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preadv(int fd, IOchunk *io, int nio, int64_t off)
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{
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return ioreadv(fd, io, nio, off);
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}
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