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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [libiberty/] [getpwd.c] - Blame information for rev 816

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1 38 julius
/* getpwd.c - get the working directory */
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/*
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@deftypefn Supplemental char* getpwd (void)
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Returns the current working directory.  This implementation caches the
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result on the assumption that the process will not call @code{chdir}
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between calls to @code{getpwd}.
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@end deftypefn
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <sys/types.h>
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#include <errno.h>
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#ifndef errno
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extern int errno;
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#endif
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#ifdef HAVE_STDLIB_H
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#include <stdlib.h>
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#endif
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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#ifdef HAVE_SYS_PARAM_H
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#include <sys/param.h>
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#endif
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif
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#if HAVE_LIMITS_H
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#include <limits.h>
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#endif
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#include "libiberty.h"
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/* Virtually every UN*X system now in common use (except for pre-4.3-tahoe
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   BSD systems) now provides getcwd as called for by POSIX.  Allow for
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   the few exceptions to the general rule here.  */
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#if !defined(HAVE_GETCWD) && defined(HAVE_GETWD)
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/* Prototype in case the system headers doesn't provide it. */
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extern char *getwd ();
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#define getcwd(buf,len) getwd(buf)
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#endif
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#ifdef MAXPATHLEN
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#define GUESSPATHLEN (MAXPATHLEN + 1)
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#else
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#define GUESSPATHLEN 100
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#endif
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#if !(defined (VMS) || (defined(_WIN32) && !defined(__CYGWIN__)))
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/* Get the working directory.  Use the PWD environment variable if it's
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   set correctly, since this is faster and gives more uniform answers
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   to the user.  Yield the working directory if successful; otherwise,
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   yield 0 and set errno.  */
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char *
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getpwd (void)
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{
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  static char *pwd;
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  static int failure_errno;
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  char *p = pwd;
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  size_t s;
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  struct stat dotstat, pwdstat;
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  if (!p && !(errno = failure_errno))
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    {
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      if (! ((p = getenv ("PWD")) != 0
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             && *p == '/'
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             && stat (p, &pwdstat) == 0
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             && stat (".", &dotstat) == 0
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             && dotstat.st_ino == pwdstat.st_ino
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             && dotstat.st_dev == pwdstat.st_dev))
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        /* The shortcut didn't work.  Try the slow, ``sure'' way.  */
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        for (s = GUESSPATHLEN;  !getcwd (p = XNEWVEC (char, s), s);  s *= 2)
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          {
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            int e = errno;
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            free (p);
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#ifdef ERANGE
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            if (e != ERANGE)
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#endif
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              {
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                errno = failure_errno = e;
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                p = 0;
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                break;
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              }
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          }
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      /* Cache the result.  This assumes that the program does
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         not invoke chdir between calls to getpwd.  */
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      pwd = p;
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    }
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  return p;
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}
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#else   /* VMS || _WIN32 && !__CYGWIN__ */
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#ifndef MAXPATHLEN
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#define MAXPATHLEN 255
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#endif
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char *
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getpwd (void)
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{
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  static char *pwd = 0;
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  if (!pwd)
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    pwd = getcwd (XNEWVEC (char, MAXPATHLEN + 1), MAXPATHLEN + 1
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#ifdef VMS
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                  , 0
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#endif
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                  );
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  return pwd;
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}
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#endif  /* VMS || _WIN32 && !__CYGWIN__ */

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