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