2008-06-12 14:26:16 -06:00
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/*
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Plan 9 from User Space src/lib9/getwd.c
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http://code.swtch.com/plan9port/src/tip/src/lib9/getwd.c
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Copyright 2001-2007 Russ Cox. All Rights Reserved.
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2011-07-22 19:21:17 -06:00
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Portions Copyright 2011 The Go Authors. All Rights Reserved.
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2008-06-12 14:26:16 -06:00
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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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2011-07-22 19:21:17 -06:00
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#include <errno.h>
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#include <sys/stat.h>
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2008-06-12 14:26:16 -06:00
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#include <libc.h>
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#undef getwd
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char*
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p9getwd(char *s, int ns)
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{
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2011-07-22 19:21:17 -06:00
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char *pwd;
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struct stat st1, st2;
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// Clumsy but widespread kludge:
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// if $PWD is set and matches ".", use it.
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// Matches glibc's get_current_dir_name and Go's os.Getwd.
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pwd = getenv("PWD"); // note: getenv, not p9getenv, so no free
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if(pwd != nil && pwd[0] &&
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stat(pwd, &st1) >= 0 && stat(".", &st2) >= 0 &&
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st1.st_dev == st2.st_dev && st1.st_ino == st2.st_ino) {
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if(strlen(pwd) >= ns) {
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errno = ERANGE;
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return nil;
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}
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strcpy(s, pwd);
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return s;
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}
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2008-06-12 14:26:16 -06:00
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return getcwd(s, ns);
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}
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