c_cpp/etc/calc/block.h

   1 /*
   2  * block - fixed, dynamic, fifo and circular memory blocks
   3  *
   4  * Copyright (C) 1999-2007  Landon Curt Noll and Ernest Bowen
   5  *
   6  * Primary author:  Landon Curt Noll
   7  *
   8  * Calc is open software; you can redistribute it and/or modify it under
   9  * the terms of the version 2.1 of the GNU Lesser General Public License
  10  * as published by the Free Software Foundation.
  11  *
  12  * Calc is distributed in the hope that it will be useful, but WITHOUT
  13  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  14  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General
  15  * Public License for more details.
  16  *
  17  * A copy of version 2.1 of the GNU Lesser General Public License is
  18  * distributed with calc under the filename COPYING-LGPL.  You should have
  19  * received a copy with calc; if not, write to Free Software Foundation, Inc.
  20  * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  21  *
  22  * @(#) $Revision: 30.1 $
  23  * @(#) $Id: block.h,v 30.1 2007/03/16 11:09:46 chongo Exp $
  24  * @(#) $Source: /usr/local/src/bin/calc/RCS/block.h,v $
  25  *
  26  * Under source code control:   1997/02/21 05:03:39
  27  * File existed as early as:    1997
  28  *
  29  * chongo <was here> /\oo/\     http://www.isthe.com/chongo/
  30  * Share and enjoy!  :-)        http://www.isthe.com/chongo/tech/comp/calc/
  31  */
  32
  33
  34 #if !defined(__BLOCK_H__)
  35 #define __BLOCK_H__
  36
  37
  38 /*
  39  * block - the basic block structure
  40  *
  41  * A block comes is one of several types.  At the moment, only fixed
  42  * types are defined.
  43  *
  44  ***
  45  *
  46  * Block functions and operations:
  47  *
  48  *      x[i]
  49  *              (i-1)th octet
  50  *
  51  *      blk(len [, blkchunk])
  52  *              unnamed block
  53  *              len > 0
  54  *              blkchunk defaults to BLK_CHUNKSIZE
  55  *
  56  *      blk(name, [len [, blkchunk]])
  57  *              named block
  58  *              len > 0
  59  *              blkchunk defaults to BLK_CHUNKSIZE
  60  *
  61  *      blkfree(x)
  62  *              Reduce storage down to 0 octetes.
  63  *
  64  *      size(x)
  65  *              The length of data stored in the block.
  66  *
  67  *      sizeof(x) == blk->maxsize
  68  *              Allocation size in memory
  69  *
  70  *      isblk(x)
  71  *              returns 0 is x is not a BLOCK, 1 if x is an
  72  *              unnamed block, 2 if x is a named BLOCK
  73  *
  74  *      blkread(x, size, count, fd [, offset])
  75  *      blkwrite(x, size, count, fd [, offset])
  76  *              returns number of items written
  77  *              offset is restricted in value by block type
  78  *
  79  *      blkset(x, val, length [, offset])
  80  *              only the lower octet of val is used
  81  *              offset is restricted in value by block type
  82  *
  83  *      blkchr(x, val, length [, offset])
  84  *              only the lower octet of val is used
  85  *              offset is restricted in value by block type
  86  *
  87  *      blkcpy(dest, src, length [, dest_offset [, src_offset]])
  88  *              0 <= length <= blksize(x)
  89  *              offset's are restricted in value by block type
  90  *              dest may not == src
  91  *
  92  *      blkmove(dest, src, length [, dest_offset [, src_offset]])
  93  *              0 <= length <= blksize(x)
  94  *              offset's are restricted in value by block type
  95  *              overlapping moves are handeled correctly
  96  *
  97  *      blkccpy(dest, src, stopval, length [, dest_offset [, src_offset]])
  98  *              0 <= length <= blksize(x)
  99  *              offset's are restricted in value by block type
 100  *
 101  *      blkcmp(dest, src, length [, dest_offset [, src_offset]])
 102  *              0 <= length <= blksize(x)
 103  *              offset's are restricted in value by block type
 104  *
 105  *      blkswap(x, a, b)
 106  *              swaps groups of 'a' octets within each 'b' octets
 107  *              b == a is a noop
 108  *              b = a*k for some integer k >= 1
 109  *
 110  *      scatter(src, dest1, dest2 [, dest3 ] ...)
 111  *              copy sucessive octets from src into dest1, dest2, ...
 112  *                  restarting with dest1 after end of list
 113  *              stops at end of src
 114  *
 115  *      gather(dest, src1, src2 [, src3 ] ...)
 116  *              copy first octet from src1, src2, ...
 117  *              copy next octet from src1, src2, ...
 118  *              ...
 119  *              copy last octet from src1, src2, ...
 120  *              copy 0 when there is no more data from a given source
 121  *
 122  *      blkseek(x, offset, {"in","out"})
 123  *              some seeks may not be allowed by block type
 124  *
 125  *      config("blkmaxprint", count)
 126  *              number of octets of a block to print, 0 means all
 127  *
 128  *      config("blkverbose", boolean)
 129  *              TRUE => print all lines, FALSE => skip dup lines
 130  *
 131  *      config("blkbase", "base")
 132  *              output block base = { "hex", "octal", "char", "binary", "raw" }
 133  *                  binary is base 2, raw is just octet values
 134  *
 135  *      config("blkfmt", "style")
 136  *              style of output = {
 137  *                  "line",     lines in blkbase with no spaces between octets
 138  *                  "string",   as one long line with no spaces between octets
 139  *                  "od_style", position, spaces between octets
 140  *                  "hd_style"} position, spaces between octets, chars on end
 141  */
 142 struct block {
 143         LEN blkchunk;   /* allocation chunk size */
 144         LEN maxsize;    /* octets actually malloced for this block */
 145         LEN datalen;    /* octets of data held this block */
 146         USB8 *data;     /* pointer to the 1st octet of the allocated data */
 147 };
 148 typedef struct block BLOCK;
 149
 150
 151 struct nblock {
 152         char *name;
 153         int subtype;
 154         int id;
 155         BLOCK *blk;
 156 };
 157 typedef struct nblock NBLOCK;
 158
 159
 160 /*
 161  * block debug
 162  */
 163 EXTERN int blk_debug;   /* 0 => debug off */
 164
 165
 166 /*
 167  * block defaults
 168  */
 169 #define BLK_CHUNKSIZE 256       /* default allocation chunk size for blocks */
 170
 171 #define BLK_DEF_MAXPRINT 256    /* default octets to print */
 172
 173 #define BLK_BASE_HEX 0          /* output octets in a block in hex */
 174 #define BLK_BASE_OCT 1          /* output octets in a block in octal */
 175 #define BLK_BASE_CHAR 2         /* output octets in a block in characters */
 176 #define BLK_BASE_BINARY 3       /* output octets in a block in base 2 chars */
 177 #define BLK_BASE_RAW 4          /* output octets in a block in raw binary */
 178
 179 #define BLK_FMT_HD_STYLE 0      /* output in base with chars on end of line */
 180 #define BLK_FMT_LINE 1          /* output is lines of up to 79 chars */
 181 #define BLK_FMT_STRING 2        /* output is one long string */
 182 #define BLK_FMT_OD_STYLE 3      /* output in base with chars */
 183
 184
 185 /*
 186  * block macros
 187  */
 188 /* length of data stored in a block */
 189 #define blklen(blk) ((blk)->datalen)
 190
 191 /* block footpint in memory */
 192 #define blksizeof(blk) ((blk)->maxsize)
 193
 194 /* block allocation chunk size */
 195 #define blkchunk(blk) ((blk)->blkchunk)
 196
 197
 198 /*
 199  * OCTET - what the INDEXADDR produces from a blk[offset]
 200  */
 201 typedef USB8 OCTET;
 202
 203
 204 /*
 205  * external functions
 206  */
 207 E_FUNC BLOCK *blkalloc(int, int);
 208 E_FUNC void blk_free(BLOCK*);
 209 E_FUNC BLOCK *blkrealloc(BLOCK*, int, int);
 210 E_FUNC void blktrunc(BLOCK*);
 211 E_FUNC BLOCK *blk_copy(BLOCK*);
 212 E_FUNC int blk_cmp(BLOCK*, BLOCK*);
 213 E_FUNC void blk_print(BLOCK*);
 214 E_FUNC void nblock_print(NBLOCK *);
 215 E_FUNC NBLOCK *createnblock(char *, int, int);
 216 E_FUNC NBLOCK *reallocnblock(int, int, int);
 217 E_FUNC int removenblock(int);
 218 E_FUNC int findnblockid(char *);
 219 E_FUNC NBLOCK *findnblock(int);
 220 E_FUNC BLOCK *copyrealloc(BLOCK*, int, int);
 221 E_FUNC int countnblocks(void);
 222 E_FUNC void shownblocks(void);
 223
 224
 225 #endif /* !__BLOCK_H__ */