include/symtab.h

   1 /*
   2  *
   3  *                This source code is part of
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   5  *                 G   R   O   M   A   C   S
   6  *
   7  *          GROningen MAchine for Chemical Simulations
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   9  *                        VERSION 3.2.0
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  12  * Copyright (c) 2001-2004, The GROMACS development team,
  13  * check out http://www.gromacs.org for more information.
  14
  15  * This program is free software; you can redistribute it and/or
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  35
  36 #ifndef _symtab_h
  37 #define _symtab_h
  38
  39 #include <stdio.h>
  40 #include "typedefs.h"
  41
  42 #ifdef __cplusplus
  43 extern "C" {
  44 #endif
  45
  46 /*
  47  * This module handles symbol table manipulation. All text strings
  48  * needed by an application are allocated only once. All references
  49  * to these text strings use handles returned from the put_symtab()
  50  * routine. These handles can easily be converted to address independent
  51  * values by invoking lookup_symtab(). So when writing structures to
  52  * a file which contains text strings, this value can be written in stead
  53  * of the text string or its address. This value can easily be converted
  54  * back to a text string handle by get_symtab_handle().
  55  */
  56
  57 void open_symtab(t_symtab *symtab);
  58      /* Initialises the symbol table symtab.
  59       */
  60
  61 void close_symtab(t_symtab *symtab);
  62      /* Undoes the effect of open_symtab(), after invoking this function,
  63       * no value can be added to the symbol table, only values can be
  64       * retrieved using get_symtab().
  65       */
  66
  67 void free_symtab(t_symtab *symtab);
  68      /* Frees the space allocated by the symbol table itself */
  69
  70 void done_symtab(t_symtab *symtab);
  71      /* Frees the space allocated by the symbol table, including all
  72       * entries in it */
  73
  74 char **put_symtab(t_symtab *symtab,const char *name);
  75      /* Enters a string into the symbol table symtab, if it was not
  76       * available, a reference to a copy is returned else a reference
  77       * to the earlier entered value is returned. Strings are trimmed
  78       * of spaces.
  79       */
  80
  81 int lookup_symtab(t_symtab *symtab,char **name);
  82      /* Returns a unique handle for **name, without a memory reference.
  83       * It is a failure when name cannot be found in the symbol table,
  84       * it should be entered before with put_symtab().
  85       */
  86
  87 char **get_symtab_handle(t_symtab *symtab,int name);
  88      /* Returns a text string handle for name. Name should be a value
  89       * returned from lookup_symtab(). So get_symtab_handle() and
  90       * lookup_symtab() are inverse functions.
  91       */
  92
  93 long wr_symtab(FILE *fp,t_symtab *symtab);
  94      /* Writes the symbol table symtab to the file, specified by fp.
  95       * The function returns the number of bytes written.
  96       */
  97
  98 long rd_symtab(FILE *fp,t_symtab *symtab);
  99      /* Reads the symbol table symtab from the file, specified by fp.
 100       * This will include allocating the needed space. The function
 101       * returns the number of bytes read. The symtab is in the closed
 102       * state afterwards, so no strings can be added to it.
 103       */
 104
 105 void pr_symtab(FILE *fp,int indent,const char *title,t_symtab *symtab);
 106      /* This routine prints out a (human) readable representation of
 107       * the symbol table symtab to the file fp. Ident specifies the
 108       * number of spaces the text should be indented. Title is used
 109       * to print a header text.
 110       */
 111
 112 #ifdef __cplusplus
 113 }
 114 #endif
 115
 116 #endif  /* _symtab_h */