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authorRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
committerRichard Henderson <rth@redhat.com>1999-05-03 07:29:11 +0000
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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 */