19990502 sourceware importbinu_ss_19990502

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+/* sb.h - header file for string buffer manipulation routines
+   Copyright (C) 1994, 1995 Free Software Foundation, Inc.
+
+   Written by Steve and Judy Chamberlain of Cygnus Support,
+      sac@cygnus.com
+
+   This file is part of GAS, the GNU Assembler.
+
+   GAS 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.
+
+   GAS 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 GAS; see the file COPYING.  If not, write to the Free
+   Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+   02111-1307, USA. */
+
+#ifndef SB_H
+
+#define SB_H
+
+#include <stdio.h>
+#include "ansidecl.h"
+
+/* string blocks
+
+   I had a couple of choices when deciding upon this data structure.
+   gas uses null terminated strings for all its internal work.  This
+   often means that parts of the program that want to examine
+   substrings have to manipulate the data in the string to do the
+   right thing (a common operation is to single out a bit of text by
+   saving away the character after it, nulling it out, operating on
+   the substring and then replacing the character which was under the
+   null).  This is a pain and I remember a load of problems that I had with
+   code in gas which almost got this right.  Also, it's harder to grow and
+   allocate null terminated strings efficiently.
+
+   Obstacks provide all the functionality needed, but are too
+   complicated, hence the sb.
+
+   An sb is allocated by the caller, and is initialzed to point to an
+   sb_element.  sb_elements are kept on a free lists, and used when
+   needed, replaced onto the free list when unused.
+ */
+
+#define sb_max_power_two    30	/* don't allow strings more than
+			           2^sb_max_power_two long */
+/* structure of an sb */
+typedef struct sb
+  {
+    char *ptr;			/* points to the current block. */
+    int len;			/* how much is used. */
+    int pot;			/* the maximum length is 1<<pot */
+    struct le *item;
+  }
+sb;
+
+/* Structure of the free list object of an sb */
+typedef struct le
+  {
+    struct le *next;
+    int size;
+    char data[1];
+  }
+sb_element;
+
+/* The free list */
+typedef struct
+  {
+    sb_element *size[sb_max_power_two];
+  } sb_list_vector;
+
+extern int string_count[sb_max_power_two];
+
+extern void sb_build PARAMS ((sb *, int));
+extern void sb_new PARAMS ((sb *));
+extern void sb_kill PARAMS ((sb *));
+extern void sb_add_sb PARAMS ((sb *, sb *));
+extern void sb_reset PARAMS ((sb *));
+extern void sb_add_char PARAMS ((sb *, int));
+extern void sb_add_string PARAMS ((sb *, const char *));
+extern void sb_add_buffer PARAMS ((sb *, const char *, int));
+extern void sb_print PARAMS ((FILE *, sb *));
+extern void sb_print_at PARAMS ((FILE *, int, sb *));
+extern char *sb_name PARAMS ((sb *));
+extern char *sb_terminate PARAMS ((sb *));
+extern int sb_skip_white PARAMS ((int, sb *));
+extern int sb_skip_comma PARAMS ((int, sb *));
+
+/* Actually in input-scrub.c.  */
+extern void input_scrub_include_sb PARAMS ((sb *, char *));
+
+#endif /* SB_H */