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+/* general.h -- Some generally useful defines. */
+
+/* This file is part of GNU Info, a program for reading online documentation
+ stored in Info format.
+
+ Copyright (C) 1993 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.
+
+ Written by Brian Fox (bfox@ai.mit.edu). */
+
+#if !defined (_GENERAL_H_)
+#define _GENERAL_H_
+
+extern void *xmalloc (), *xrealloc ();
+
+#if defined (HAVE_UNISTD_H)
+# include <unistd.h>
+#endif /* HAVE_UNISTD_H */
+
+#if defined (HAVE_STRING_H)
+# include <string.h>
+#else
+# include <strings.h>
+#endif /* !HAVE_STRING_H */
+
+#include "clib.h"
+
+#define info_toupper(x) (islower (x) ? toupper (x) : x)
+#define info_tolower(x) (isupper (x) ? tolower (x) : x)
+
+#if !defined (whitespace)
+# define whitespace(c) ((c == ' ') || (c == '\t'))
+#endif /* !whitespace */
+
+#if !defined (whitespace_or_newline)
+# define whitespace_or_newline(c) (whitespace (c) || (c == '\n'))
+#endif /* !whitespace_or_newline */
+
+#if !defined (__FUNCTION_DEF)
+# define __FUNCTION_DEF
+typedef int Function ();
+typedef void VFunction ();
+typedef char *CFunction ();
+#endif /* _FUNCTION_DEF */
+
+/* Add POINTER to the list of pointers found in ARRAY. SLOTS is the number
+ of slots that have already been allocated. INDEX is the index into the
+ array where POINTER should be added. GROW is the number of slots to grow
+ ARRAY by, in the case that it needs growing. TYPE is a cast of the type
+ of object stored in ARRAY (e.g., NODE_ENTRY *. */
+#define add_pointer_to_array(pointer, idx, array, slots, grow, type) \
+ do { \
+ if (idx + 2 >= slots) \
+ array = (type *)(xrealloc (array, (slots += grow) * sizeof (type))); \
+ array[idx++] = (type)pointer; \
+ array[idx] = (type)NULL; \
+ } while (0)
+
+#define maybe_free(x) do { if (x) free (x); } while (0)
+
+#if !defined (zero_mem) && defined (HAVE_MEMSET)
+# define zero_mem(mem, length) memset (mem, 0, length)
+#endif /* !zero_mem && HAVE_MEMSET */
+
+#if !defined (zero_mem) && defined (HAVE_BZERO)
+# define zero_mem(mem, length) bzero (mem, length)
+#endif /* !zero_mem && HAVE_BZERO */
+
+#if !defined (zero_mem)
+# define zero_mem(mem, length) \
+ do { \
+ register int zi; \
+ register unsigned char *place; \
+ \
+ place = (unsigned char *)mem; \
+ for (zi = 0; zi < length; zi++) \
+ place[zi] = 0; \
+ } while (0)
+#endif /* !zero_mem */
+
+#endif /* !_GENERAL_H_ */