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