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/* gawkmisc.c --- miscellanious gawk routines that are OS specific.
Copyright (C) 1986, 1988, 1989, 1991 - 98, 2001 the Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
char quote = '\'';
char *defpath = DEFPATH;
char envsep = ':';
#ifndef INVALID_HANDLE
/* FIXME: is this value for INVALID_HANDLE correct? */
#define INVALID_HANDLE -1
#endif
/* gawk_name --- pull out the "gawk" part from how the OS called us */
char *
gawk_name(filespec)
const char *filespec;
{
char *p;
/* "path/name" -> "name" */
p = strrchr(filespec, '/');
return (p == NULL ? (char *) filespec : p + 1);
}
/* os_arg_fixup --- fixup the command line */
void
os_arg_fixup(argcp, argvp)
int *argcp;
char ***argvp;
{
/* no-op */
return;
}
/* os_devopen --- open special per-OS devices */
int
os_devopen(name, flag)
const char *name;
int flag;
{
/* no-op */
return INVALID_HANDLE;
}
/* optimal_bufsize --- determine optimal buffer size */
int
optimal_bufsize(fd, stb)
int fd;
struct stat *stb;
{
/* force all members to zero in case OS doesn't use all of them. */
memset(stb, '\0', sizeof(struct stat));
/*
* System V.n, n < 4, doesn't have the file system block size in the
* stat structure. So we have to make some sort of reasonable
* guess. We use stdio's BUFSIZ, since that is what it was
* meant for in the first place.
*/
#ifdef HAVE_ST_BLKSIZE
#define DEFBLKSIZE (stb->st_blksize ? stb->st_blksize : BUFSIZ)
#else
#define DEFBLKSIZE BUFSIZ
#endif
if (isatty(fd))
return BUFSIZ;
if (fstat(fd, stb) == -1)
fatal("can't stat fd %d (%s)", fd, strerror(errno));
if (lseek(fd, (off_t)0, 0) == -1) /* not a regular file */
return DEFBLKSIZE;
if (stb->st_size > 0 && stb->st_size < DEFBLKSIZE) /* small file */
return stb->st_size;
return DEFBLKSIZE;
}
/* ispath --- return true if path has directory components */
int
ispath(file)
const char *file;
{
return (strchr(file, '/') != NULL);
}
/* isdirpunct --- return true if char is a directory separator */
int
isdirpunct(c)
int c;
{
return (c == '/');
}
/* os_close_on_exec --- set close on exec flag, print warning if fails */
void
os_close_on_exec(fd, name, what, dir)
int fd;
const char *name, *what, *dir;
{
if (fcntl(fd, F_SETFD, 1) < 0)
warning(_("%s %s `%s': could not set close-on-exec: %s"),
what, dir, name, strerror(errno));
}
/* os_isdir --- is this an fd on a directory? */
#if ! defined(S_ISDIR) && defined(S_IFDIR)
#define S_ISDIR(m) (((m) & S_IFMT) == S_IFDIR)
#endif
int
os_isdir(fd)
int fd;
{
struct stat sbuf;
return (fstat(fd, &sbuf) == 0 && S_ISDIR(sbuf.st_mode));
}
/* os_is_setuid --- true if running setuid root */
int
os_is_setuid()
{
long uid, euid;
uid = getuid();
euid = geteuid();
return (euid == 0 && euid != uid);
}
/* os_setbinmode --- set binary mode on file */
int
os_setbinmode (fd, mode)
int fd, mode;
{
return 0;
}
/* os_restore_mode --- restore the original mode of the console device */
void
os_restore_mode (fd)
int fd;
{
/* no-op */
return;
}
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