Home » Archimedes archive » Acorn User » AU 1996-Xmas.adf » Features » Arcade/!Popcorn/c/FindSymbol

Arcade/!Popcorn/c/FindSymbol

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Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.

Tape/disk: Home » Archimedes archive » Acorn User » AU 1996-Xmas.adf » Features
Filename: Arcade/!Popcorn/c/FindSymbol
Read OK: ✔
File size: 0411 bytes
Load address: 0000
Exec address: 0000
Duplicates

There is 1 duplicate copy of this file in the archive:

File contents
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "Popcorn:h.Popcorn"

char   			symbol_table_filename[255];
char			*symbol_table = NULL;
int			st_length = 0;

object_handler Popcorn_FindSymbol(char *name)
{
  FILE           *st_handle;
  char		 *cmp;
  int		 namelen = strlen(name);
  object_handler return_func;

  if (symbol_table == NULL)
  {
    st_handle = fopen(symbol_table_filename, "rb");
    if (st_handle == NULL)
      return(NULL);
    fseek(st_handle, 0, 2); /* End of file */
    st_length = (int) ftell(st_handle);
    symbol_table = malloc(st_length);
    rewind(st_handle);
    fread(symbol_table, 1, st_length, st_handle);
    fclose(st_handle);
  }

  cmp = symbol_table;
  while (memcmp(cmp, name, namelen) != 0 && cmp != (symbol_table+st_length) )
  {
    while (*cmp >= 32)
      cmp++;
    cmp++;
  }

  if (cmp == (symbol_table + st_length))
    return(NULL);

  while (*cmp != 32)
    cmp++;
  while (*cmp == 32)
    cmp++;

  sscanf(cmp, "%x\n", (void*) &return_func);
  return(return_func);
}

00000000  23 69 6e 63 6c 75 64 65  20 3c 73 74 64 6c 69 62  |#include <stdlib|
00000010  2e 68 3e 0a 23 69 6e 63  6c 75 64 65 20 3c 73 74  |.h>.#include <st|
00000020  64 69 6f 2e 68 3e 0a 23  69 6e 63 6c 75 64 65 20  |dio.h>.#include |
00000030  3c 73 74 72 69 6e 67 2e  68 3e 0a 0a 23 69 6e 63  |<string.h>..#inc|
00000040  6c 75 64 65 20 22 50 6f  70 63 6f 72 6e 3a 68 2e  |lude "Popcorn:h.|
00000050  50 6f 70 63 6f 72 6e 22  0a 0a 63 68 61 72 20 20  |Popcorn"..char  |
00000060  20 09 09 09 73 79 6d 62  6f 6c 5f 74 61 62 6c 65  | ...symbol_table|
00000070  5f 66 69 6c 65 6e 61 6d  65 5b 32 35 35 5d 3b 0a  |_filename[255];.|
00000080  63 68 61 72 09 09 09 2a  73 79 6d 62 6f 6c 5f 74  |char...*symbol_t|
00000090  61 62 6c 65 20 3d 20 4e  55 4c 4c 3b 0a 69 6e 74  |able = NULL;.int|
000000a0  09 09 09 73 74 5f 6c 65  6e 67 74 68 20 3d 20 30  |...st_length = 0|
000000b0  3b 0a 0a 6f 62 6a 65 63  74 5f 68 61 6e 64 6c 65  |;..object_handle|
000000c0  72 20 50 6f 70 63 6f 72  6e 5f 46 69 6e 64 53 79  |r Popcorn_FindSy|
000000d0  6d 62 6f 6c 28 63 68 61  72 20 2a 6e 61 6d 65 29  |mbol(char *name)|
000000e0  0a 7b 0a 20 20 46 49 4c  45 20 20 20 20 20 20 20  |.{.  FILE       |
000000f0  20 20 20 20 2a 73 74 5f  68 61 6e 64 6c 65 3b 0a  |    *st_handle;.|
00000100  20 20 63 68 61 72 09 09  20 2a 63 6d 70 3b 0a 20  |  char.. *cmp;. |
00000110  20 69 6e 74 09 09 20 6e  61 6d 65 6c 65 6e 20 3d  | int.. namelen =|
00000120  20 73 74 72 6c 65 6e 28  6e 61 6d 65 29 3b 0a 20  | strlen(name);. |
00000130  20 6f 62 6a 65 63 74 5f  68 61 6e 64 6c 65 72 20  | object_handler |
00000140  72 65 74 75 72 6e 5f 66  75 6e 63 3b 0a 0a 20 20  |return_func;..  |
00000150  69 66 20 28 73 79 6d 62  6f 6c 5f 74 61 62 6c 65  |if (symbol_table|
00000160  20 3d 3d 20 4e 55 4c 4c  29 0a 20 20 7b 0a 20 20  | == NULL).  {.  |
00000170  20 20 73 74 5f 68 61 6e  64 6c 65 20 3d 20 66 6f  |  st_handle = fo|
00000180  70 65 6e 28 73 79 6d 62  6f 6c 5f 74 61 62 6c 65  |pen(symbol_table|
00000190  5f 66 69 6c 65 6e 61 6d  65 2c 20 22 72 62 22 29  |_filename, "rb")|
000001a0  3b 0a 20 20 20 20 69 66  20 28 73 74 5f 68 61 6e  |;.    if (st_han|
000001b0  64 6c 65 20 3d 3d 20 4e  55 4c 4c 29 0a 20 20 20  |dle == NULL).   |
000001c0  20 20 20 72 65 74 75 72  6e 28 4e 55 4c 4c 29 3b  |   return(NULL);|
000001d0  0a 20 20 20 20 66 73 65  65 6b 28 73 74 5f 68 61  |.    fseek(st_ha|
000001e0  6e 64 6c 65 2c 20 30 2c  20 32 29 3b 20 2f 2a 20  |ndle, 0, 2); /* |
000001f0  45 6e 64 20 6f 66 20 66  69 6c 65 20 2a 2f 0a 20  |End of file */. |
00000200  20 20 20 73 74 5f 6c 65  6e 67 74 68 20 3d 20 28  |   st_length = (|
00000210  69 6e 74 29 20 66 74 65  6c 6c 28 73 74 5f 68 61  |int) ftell(st_ha|
00000220  6e 64 6c 65 29 3b 0a 20  20 20 20 73 79 6d 62 6f  |ndle);.    symbo|
00000230  6c 5f 74 61 62 6c 65 20  3d 20 6d 61 6c 6c 6f 63  |l_table = malloc|
00000240  28 73 74 5f 6c 65 6e 67  74 68 29 3b 0a 20 20 20  |(st_length);.   |
00000250  20 72 65 77 69 6e 64 28  73 74 5f 68 61 6e 64 6c  | rewind(st_handl|
00000260  65 29 3b 0a 20 20 20 20  66 72 65 61 64 28 73 79  |e);.    fread(sy|
00000270  6d 62 6f 6c 5f 74 61 62  6c 65 2c 20 31 2c 20 73  |mbol_table, 1, s|
00000280  74 5f 6c 65 6e 67 74 68  2c 20 73 74 5f 68 61 6e  |t_length, st_han|
00000290  64 6c 65 29 3b 0a 20 20  20 20 66 63 6c 6f 73 65  |dle);.    fclose|
000002a0  28 73 74 5f 68 61 6e 64  6c 65 29 3b 0a 20 20 7d  |(st_handle);.  }|
000002b0  0a 0a 20 20 63 6d 70 20  3d 20 73 79 6d 62 6f 6c  |..  cmp = symbol|
000002c0  5f 74 61 62 6c 65 3b 0a  20 20 77 68 69 6c 65 20  |_table;.  while |
000002d0  28 6d 65 6d 63 6d 70 28  63 6d 70 2c 20 6e 61 6d  |(memcmp(cmp, nam|
000002e0  65 2c 20 6e 61 6d 65 6c  65 6e 29 20 21 3d 20 30  |e, namelen) != 0|
000002f0  20 26 26 20 63 6d 70 20  21 3d 20 28 73 79 6d 62  | && cmp != (symb|
00000300  6f 6c 5f 74 61 62 6c 65  2b 73 74 5f 6c 65 6e 67  |ol_table+st_leng|
00000310  74 68 29 20 29 0a 20 20  7b 0a 20 20 20 20 77 68  |th) ).  {.    wh|
00000320  69 6c 65 20 28 2a 63 6d  70 20 3e 3d 20 33 32 29  |ile (*cmp >= 32)|
00000330  0a 20 20 20 20 20 20 63  6d 70 2b 2b 3b 0a 20 20  |.      cmp++;.  |
00000340  20 20 63 6d 70 2b 2b 3b  0a 20 20 7d 0a 0a 20 20  |  cmp++;.  }..  |
00000350  69 66 20 28 63 6d 70 20  3d 3d 20 28 73 79 6d 62  |if (cmp == (symb|
00000360  6f 6c 5f 74 61 62 6c 65  20 2b 20 73 74 5f 6c 65  |ol_table + st_le|
00000370  6e 67 74 68 29 29 0a 20  20 20 20 72 65 74 75 72  |ngth)).    retur|
00000380  6e 28 4e 55 4c 4c 29 3b  0a 0a 20 20 77 68 69 6c  |n(NULL);..  whil|
00000390  65 20 28 2a 63 6d 70 20  21 3d 20 33 32 29 0a 20  |e (*cmp != 32). |
000003a0  20 20 20 63 6d 70 2b 2b  3b 0a 20 20 77 68 69 6c  |   cmp++;.  whil|
000003b0  65 20 28 2a 63 6d 70 20  3d 3d 20 33 32 29 0a 20  |e (*cmp == 32). |
000003c0  20 20 20 63 6d 70 2b 2b  3b 0a 0a 20 20 73 73 63  |   cmp++;..  ssc|
000003d0  61 6e 66 28 63 6d 70 2c  20 22 25 78 5c 6e 22 2c  |anf(cmp, "%x\n",|
000003e0  20 28 76 6f 69 64 2a 29  20 26 72 65 74 75 72 6e  | (void*) &return|
000003f0  5f 66 75 6e 63 29 3b 0a  20 20 72 65 74 75 72 6e  |_func);.  return|
00000400  28 72 65 74 75 72 6e 5f  66 75 6e 63 29 3b 0a 7d  |(return_func);.}|
00000410  0a                                                |.|
00000411

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