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A cute hack to speed up things by Keith: if getenv("PWD") is the same

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inode as ".", then just return that.  I added a check so it must start with
a '/'.

Reviewed by:	phk
Submitted by:	bostic@cs.berkeley.edu (Keith Bostic)
This commit is contained in:
Poul-Henning Kamp 1995-02-04 19:29:22 +00:00
parent cbaba1a477
commit 03cfe806a2
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=6182
1 changed files with 24 additions and 5 deletions
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29
lib/libc/gen/getcwd.c
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@ -1,5 +1,5 @@
/*
* Copyright (c) 1989, 1991, 1993
* Copyright (c) 1989, 1991, 1993, 1995
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -32,7 +32,7 @@
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)getcwd.c 8.1 (Berkeley) 6/4/93";
static char sccsid[] = "@(#)getcwd.c 8.2 (Berkeley) 1/31/95";
#endif /* LIBC_SCCS and not lint */
#include <sys/param.h>
@ -63,10 +63,29 @@ getcwd(pt, size)
struct stat s;
dev_t root_dev;
ino_t root_ino;
size_t ptsize, upsize;
size_t ptsize, pwdlen, upsize;
int save_errno;
char *ept, *eup, *up;
char *ept, *eup, *pwd, *up;
/* Check $PWD -- if it's right, it's fast. */
if ((pwd = getenv("PWD")) != NULL && !stat(pwd, &s) && *pwd == '/') {
dev = s.st_dev;
ino = s.st_ino;
if (!stat(".", &s) && dev == s.st_dev && ino == s.st_ino) {
pwdlen = strlen(pwd);
if (size != 0) {
if (pwdlen + 1 > size) {
errno = ERANGE;
return (NULL);
}
} else if ((pt = malloc(pwdlen + 1)) == NULL)
return (NULL);
memmove(pt, pwd, pwdlen);
pwd[pwdlen] = '\0';
return (pt);
}
}
/*
* If no buffer specified by the user, allocate one as necessary.
* If a buffer is specified, the size has to be non-zero. The path
@ -94,7 +113,7 @@ getcwd(pt, size)
/*
* Allocate bytes (1024 - malloc space) for the string of "../"'s.
* Should always be enough (it's 340 levels). If it's not, allocate
* as necessary. Special * case the first stat, it's ".", not "..".
* as necessary. Special case the first stat, it's ".", not "..".
*/
if ((up = malloc(upsize = 1024 - 4)) == NULL)
goto err;