| 1 | /* sb.h - header file for string buffer manipulation routines
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| 2 | Copyright 1994, 1995, 2000 Free Software Foundation, Inc.
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| 3 |
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| 4 | Written by Steve and Judy Chamberlain of Cygnus Support,
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| 5 | sac@cygnus.com
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| 6 |
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| 7 | This file is part of GAS, the GNU Assembler.
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| 8 |
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| 9 | GAS is free software; you can redistribute it and/or modify
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| 10 | it under the terms of the GNU General Public License as published by
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| 11 | the Free Software Foundation; either version 2, or (at your option)
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| 12 | any later version.
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| 13 |
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| 14 | GAS is distributed in the hope that it will be useful,
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| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 17 | GNU General Public License for more details.
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| 18 |
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| 19 | You should have received a copy of the GNU General Public License
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| 20 | along with GAS; see the file COPYING. If not, write to the Free
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| 21 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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| 22 | 02111-1307, USA. */
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| 23 |
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| 24 | #ifndef SB_H
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| 25 |
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| 26 | #define SB_H
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| 27 |
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| 28 | #include <stdio.h>
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| 29 | #include "ansidecl.h"
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| 30 |
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| 31 | /* string blocks
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| 32 |
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| 33 | I had a couple of choices when deciding upon this data structure.
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| 34 | gas uses null terminated strings for all its internal work. This
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| 35 | often means that parts of the program that want to examine
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| 36 | substrings have to manipulate the data in the string to do the
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| 37 | right thing (a common operation is to single out a bit of text by
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| 38 | saving away the character after it, nulling it out, operating on
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| 39 | the substring and then replacing the character which was under the
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| 40 | null). This is a pain and I remember a load of problems that I had with
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| 41 | code in gas which almost got this right. Also, it's harder to grow and
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| 42 | allocate null terminated strings efficiently.
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| 43 |
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| 44 | Obstacks provide all the functionality needed, but are too
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| 45 | complicated, hence the sb.
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| 46 |
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| 47 | An sb is allocated by the caller, and is initialzed to point to an
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| 48 | sb_element. sb_elements are kept on a free lists, and used when
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| 49 | needed, replaced onto the free list when unused.
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| 50 | */
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| 51 |
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| 52 | #define sb_max_power_two 30 /* don't allow strings more than
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| 53 | 2^sb_max_power_two long */
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| 54 | /* structure of an sb */
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| 55 | typedef struct sb
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| 56 | {
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| 57 | char *ptr; /* points to the current block. */
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| 58 | int len; /* how much is used. */
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| 59 | int pot; /* the maximum length is 1<<pot */
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| 60 | struct le *item;
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| 61 | }
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| 62 | sb;
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| 63 |
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| 64 | /* Structure of the free list object of an sb */
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| 65 | typedef struct le
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| 66 | {
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| 67 | struct le *next;
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| 68 | int size;
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| 69 | char data[1];
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| 70 | }
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| 71 | sb_element;
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| 72 |
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| 73 | /* The free list */
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| 74 | typedef struct
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| 75 | {
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| 76 | sb_element *size[sb_max_power_two];
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| 77 | } sb_list_vector;
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| 78 |
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| 79 | extern int string_count[sb_max_power_two];
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| 80 |
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| 81 | extern void sb_build PARAMS ((sb *, int));
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| 82 | extern void sb_new PARAMS ((sb *));
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| 83 | extern void sb_kill PARAMS ((sb *));
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| 84 | extern void sb_add_sb PARAMS ((sb *, sb *));
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| 85 | extern void sb_reset PARAMS ((sb *));
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| 86 | extern void sb_add_char PARAMS ((sb *, int));
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| 87 | extern void sb_add_string PARAMS ((sb *, const char *));
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| 88 | extern void sb_add_buffer PARAMS ((sb *, const char *, int));
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| 89 | extern void sb_print PARAMS ((FILE *, sb *));
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| 90 | extern void sb_print_at PARAMS ((FILE *, int, sb *));
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| 91 | extern char *sb_name PARAMS ((sb *));
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| 92 | extern char *sb_terminate PARAMS ((sb *));
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| 93 | extern int sb_skip_white PARAMS ((int, sb *));
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| 94 | extern int sb_skip_comma PARAMS ((int, sb *));
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| 95 |
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| 96 | /* Actually in input-scrub.c. */
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| 97 | extern void input_scrub_include_sb PARAMS ((sb *, char *, int));
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| 98 |
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| 99 | #endif /* SB_H */
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