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- /*
- * gawkmisc.c --- miscellanious gawk routines that are OS specific.
- */
-
- /*
- * Copyright (C) 1986, 1988, 1989, 1991 - 95 the Free Software Foundation, Inc.
- *
- * This file is part of GAWK, the GNU implementation of the
- * AWK Programming Language.
- *
- * GAWK 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 of the License, or
- * (at your option) any later version.
- *
- * GAWK 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 = ':';
-
- /* 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 == '/');
- }
-
-