include/symtab.h

   1 /*
   2  *
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   4  *
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   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 #ifdef HAVE_CONFIG_H
  40 #include <config.h>
  41 #endif
  42
  43
  44 #include <stdio.h>
  45 #include "typedefs.h"
  46
  47
  48 #ifdef __cplusplus
  49 extern "C" {
  50 #endif
  51
  52 /*
  53  * This module handles symbol table manipulation. All text strings
  54  * needed by an application are allocated only once. All references
  55  * to these text strings use handles returned from the put_symtab()
  56  * routine. These handles can easily be converted to address independent
  57  * values by invoking lookup_symtab(). So when writing structures to
  58  * a file which contains text strings, this value can be written in stead
  59  * of the text string or its address. This value can easily be converted
  60  * back to a text string handle by get_symtab_handle().
  61  */
  62
  63 extern void open_symtab(t_symtab *symtab);
  64      /* Initialises the symbol table symtab.
  65       */
  66
  67 extern void close_symtab(t_symtab *symtab);
  68      /* Undoes the effect of open_symtab(), after invoking this function,
  69       * no value can be added to the symbol table, only values can be
  70       * retrieved using get_symtab().
  71       */
  72
  73 extern void free_symtab(t_symtab *symtab);
  74      /* Frees the space allocated by the symbol table itself */
  75
  76 extern void done_symtab(t_symtab *symtab);
  77      /* Frees the space allocated by the symbol table, including all
  78       * entries in it */
  79
  80 extern char **put_symtab(t_symtab *symtab,const char *name);
  81      /* Enters a string into the symbol table symtab, if it was not
  82       * available, a reference to a copy is returned else a reference
  83       * to the earlier entered value is returned. Strings are trimmed
  84       * of spaces.
  85       */
  86
  87 extern int lookup_symtab(t_symtab *symtab,char **name);
  88      /* Returns a unique handle for **name, without a memory reference.
  89       * It is a failure when name cannot be found in the symbol table,
  90       * it should be entered before with put_symtab().
  91       */
  92
  93 extern char **get_symtab_handle(t_symtab *symtab,int name);
  94      /* Returns a text string handle for name. Name should be a value
  95       * returned from lookup_symtab(). So get_symtab_handle() and
  96       * lookup_symtab() are inverse functions.
  97       */
  98
  99 extern long wr_symtab(FILE *fp,t_symtab *symtab);
 100      /* Writes the symbol table symtab to the file, specified by fp.
 101       * The function returns the number of bytes written.
 102       */
 103
 104 extern long rd_symtab(FILE *fp,t_symtab *symtab);
 105      /* Reads the symbol table symtab from the file, specified by fp.
 106       * This will include allocating the needed space. The function
 107       * returns the number of bytes read. The symtab is in the closed
 108       * state afterwards, so no strings can be added to it.
 109       */
 110
 111 extern void pr_symtab(FILE *fp,int indent,const char *title,t_symtab *symtab);
 112      /* This routine prints out a (human) readable representation of
 113       * the symbol table symtab to the file fp. Ident specifies the
 114       * number of spaces the text should be indented. Title is used
 115       * to print a header text.
 116       */
 117
 118 #ifdef __cplusplus
 119 }
 120 #endif
 121
 122 #endif  /* _symtab_h */