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e21b3a40ac
Use OS rather than compiler specific flag the same way that __FreeBSD__, __APPLE__, __OpenBSD__, and __linux__ are used. _WIN32 is defined by GCC (and others) on windows for Win32 and Win64 applications. _WIN32 is set by default for several other windows based compilers: DMC, MSVC, Intel, Watcom, LCC. Although the change is for consistency, it allows the Go tools to be compiled with non-Mingw GCC distributions and non-GCC compilers that support the GCC extensions. R=rsc, brainman, vcc CC=golang-dev https://golang.org/cl/2168043
94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
/*
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http://code.google.com/p/inferno-os/source/browse/libbio/bseek.c
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Copyright © 1994-1999 Lucent Technologies Inc. All rights reserved.
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Revisions Copyright © 2000-2007 Vita Nuova Holdings Limited (www.vitanuova.com). All rights reserved.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#include <u.h>
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#include <libc.h>
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#include <bio.h>
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vlong
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Bseek(Biobuf *bp, vlong offset, int base)
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{
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vlong n, d;
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int bufsz;
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#ifndef _WIN32
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if(sizeof(offset) != sizeof(off_t)) {
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fprint(2, "Bseek: libbio compiled with %d-byte offset\n", sizeof(off_t));
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abort();
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}
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#endif
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switch(bp->state) {
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default:
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fprint(2, "Bseek: unknown state %d\n", bp->state);
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return Beof;
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case Bracteof:
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bp->state = Bractive;
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bp->icount = 0;
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bp->gbuf = bp->ebuf;
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case Bractive:
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n = offset;
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if(base == 1) {
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n += Boffset(bp);
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base = 0;
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}
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/*
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* try to seek within buffer
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*/
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if(base == 0) {
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d = n - Boffset(bp);
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bufsz = bp->ebuf - bp->gbuf;
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if(-bufsz <= d && d <= bufsz){
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bp->icount += d;
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if(d >= 0) {
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if(bp->icount <= 0)
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return n;
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} else {
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if(bp->ebuf - bp->gbuf >= -bp->icount)
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return n;
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}
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}
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}
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/*
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* reset the buffer
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*/
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n = lseek(bp->fid, n, base);
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bp->icount = 0;
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bp->gbuf = bp->ebuf;
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break;
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case Bwactive:
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Bflush(bp);
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n = lseek(bp->fid, offset, base);
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break;
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}
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bp->offset = n;
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return n;
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}
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