freebsd-nq/contrib/gcc/getpwd.c
Peter Wemm a4cd5630b0 Import of unmodified (but trimmed) gcc-2.7.2. The bigger parts of the
non-i386, non-unix, and generatable files have been trimmed, but can easily
be added in later if needed.

gcc-2.7.2.1 will follow shortly, it's a very small delta to this and it's
handy to have both available for reference for such little cost.

The freebsd-specific changes will then be committed, and once the dust has
settled, the bmakefiles will be committed to use this code.
1996-09-18 05:35:50 +00:00

102 lines
2.1 KiB
C

/* getpwd.c - get the working directory */
#include "config.h"
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#ifndef errno
extern int errno;
#endif
/* Virtually every UN*X system now in common use (except for pre-4.3-tahoe
BSD systems) now provides getcwd as called for by POSIX. Allow for
the few exceptions to the general rule here. */
#if !(defined (POSIX) || defined (USG) || defined (VMS)) || defined (HAVE_GETWD)
#include <sys/param.h>
extern char *getwd ();
#define getcwd(buf,len) getwd(buf)
#ifdef MAXPATHLEN
#define GUESSPATHLEN (MAXPATHLEN + 1)
#else
#define GUESSPATHLEN 100
#endif
#else /* (defined (USG) || defined (VMS)) */
extern char *getcwd ();
/* We actually use this as a starting point, not a limit. */
#define GUESSPATHLEN 100
#endif /* (defined (USG) || defined (VMS)) */
#ifdef _WIN32
#include <direct.h>
#endif
char *getenv ();
char *xmalloc ();
#ifndef VMS
/* Get the working directory. Use the PWD environment variable if it's
set correctly, since this is faster and gives more uniform answers
to the user. Yield the working directory if successful; otherwise,
yield 0 and set errno. */
char *
getpwd ()
{
static char *pwd;
static int failure_errno;
char *p = pwd;
size_t s;
struct stat dotstat, pwdstat;
if (!p && !(errno = failure_errno))
{
if (! ((p = getenv ("PWD")) != 0
&& *p == '/'
&& stat (p, &pwdstat) == 0
&& stat (".", &dotstat) == 0
&& dotstat.st_ino == pwdstat.st_ino
&& dotstat.st_dev == pwdstat.st_dev))
/* The shortcut didn't work. Try the slow, ``sure'' way. */
for (s = GUESSPATHLEN; ! getcwd (p = xmalloc (s), s); s *= 2)
{
int e = errno;
free (p);
#ifdef ERANGE
if (e != ERANGE)
#endif
{
errno = failure_errno = e;
p = 0;
break;
}
}
/* Cache the result. This assumes that the program does
not invoke chdir between calls to getpwd. */
pwd = p;
}
return p;
}
#else /* VMS */
#ifndef MAXPATHLEN
#define MAXPATHLEN 255
#endif
char *
getpwd ()
{
static char *pwd = 0;
if (!pwd) pwd = getcwd (xmalloc (MAXPATHLEN+1), MAXPATHLEN+1);
return pwd;
}
#endif /* VMS */