1 /* sb.h - header file for string buffer manipulation routines 2 Copyright (C) 1994-2016 Free Software Foundation, Inc. 3 4 Written by Steve and Judy Chamberlain of Cygnus Support, 5 sac (at) cygnus.com 6 7 This file is part of GAS, the GNU Assembler. 8 9 GAS is free software; you can redistribute it and/or modify 10 it under the terms of the GNU General Public License as published by 11 the Free Software Foundation; either version 3, or (at your option) 12 any later version. 13 14 GAS is distributed in the hope that it will be useful, 15 but WITHOUT ANY WARRANTY; without even the implied warranty of 16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 GNU General Public License for more details. 18 19 You should have received a copy of the GNU General Public License 20 along with GAS; see the file COPYING. If not, write to the Free 21 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 22 02110-1301, USA. */ 23 24 #ifndef SB_H 25 26 #define SB_H 27 28 /* String blocks 29 30 I had a couple of choices when deciding upon this data structure. 31 gas uses null terminated strings for all its internal work. This 32 often means that parts of the program that want to examine 33 substrings have to manipulate the data in the string to do the 34 right thing (a common operation is to single out a bit of text by 35 saving away the character after it, nulling it out, operating on 36 the substring and then replacing the character which was under the 37 null). This is a pain and I remember a load of problems that I had with 38 code in gas which almost got this right. Also, it's harder to grow and 39 allocate null terminated strings efficiently. 40 41 Obstacks provide all the functionality needed, but are too 42 complicated, hence the sb. 43 44 An sb is allocated by the caller. */ 45 46 typedef struct sb 47 { 48 char *ptr; /* Points to the current block. */ 49 size_t len; /* How much is used. */ 50 size_t max; /* The maximum length. */ 51 } 52 sb; 53 54 extern void sb_new (sb *); 55 extern void sb_build (sb *, size_t); 56 extern void sb_kill (sb *); 57 extern void sb_add_sb (sb *, sb *); 58 extern void sb_scrub_and_add_sb (sb *, sb *); 59 extern void sb_reset (sb *); 60 extern void sb_add_char (sb *, size_t); 61 extern void sb_add_string (sb *, const char *); 62 extern void sb_add_buffer (sb *, const char *, size_t); 63 extern char *sb_terminate (sb *); 64 extern size_t sb_skip_white (size_t, sb *); 65 extern size_t sb_skip_comma (size_t, sb *); 66 67 /* Actually in input-scrub.c. */ 68 extern void input_scrub_include_sb (sb *, char *, int); 69 70 #endif /* SB_H */ 71
