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[/] [openrisc/] [trunk/] [gnu-old/] [binutils-2.18.50/] [gas/] [sb.h] - Blame information for rev 857

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/* sb.h - header file for string buffer manipulation routines
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   Copyright 1994, 1995, 2000, 2003, 2006, 2007 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 3, 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, 51 Franklin Street - Fifth Floor, Boston, MA
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   02110-1301, USA.  */
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#ifndef SB_H
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#define SB_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 initialized 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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#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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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 a string block.  */
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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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extern void sb_new (sb *);
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extern void sb_kill (sb *);
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extern void sb_add_sb (sb *, sb *);
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extern void sb_scrub_and_add_sb (sb *, sb *);
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extern void sb_reset (sb *);
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extern void sb_add_char (sb *, int);
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extern void sb_add_string (sb *, const char *);
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extern void sb_add_buffer (sb *, const char *, int);
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extern char *sb_terminate (sb *);
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extern int sb_skip_white (int, sb *);
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extern int sb_skip_comma (int, sb *);
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/* Actually in input-scrub.c.  */
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extern void input_scrub_include_sb (sb *, char *, int);
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#endif /* SB_H */

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