include/symtab.h

   1 /*
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   9  *                        VERSION 3.2.0
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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  * This module handles symbol table manipulation. All text strings
  49  * needed by an application are allocated only once. All references
  50  * to these text strings use handles returned from the put_symtab()
  51  * routine. These handles can easily be converted to address independent
  52  * values by invoking lookup_symtab(). So when writing structures to
  53  * a file which contains text strings, this value can be written in stead
  54  * of the text string or its address. This value can easily be converted
  55  * back to a text string handle by get_symtab_handle().
  56  */
  57
  58 extern void open_symtab(t_symtab *symtab);
  59      /* Initialises the symbol table symtab.
  60       */
  61
  62 extern void close_symtab(t_symtab *symtab);
  63      /* Undoes the effect of open_symtab(), after invoking this function,
  64       * no value can be added to the symbol table, only values can be
  65       * retrieved using get_symtab().
  66       */
  67
  68 extern void free_symtab(t_symtab *symtab);
  69      /* Frees the space allocated by the symbol table itself */
  70
  71 extern void done_symtab(t_symtab *symtab);
  72      /* Frees the space allocated by the symbol table, including all
  73       * entries in it */
  74
  75 extern char **put_symtab(t_symtab *symtab,const char *name);
  76      /* Enters a string into the symbol table symtab, if it was not
  77       * available, a reference to a copy is returned else a reference
  78       * to the earlier entered value is returned. Strings are trimmed
  79       * of spaces.
  80       */
  81
  82 extern int lookup_symtab(t_symtab *symtab,char **name);
  83      /* Returns a unique handle for **name, without a memory reference.
  84       * It is a failure when name cannot be found in the symbol table,
  85       * it should be entered before with put_symtab().
  86       */
  87
  88 extern char **get_symtab_handle(t_symtab *symtab,int name);
  89      /* Returns a text string handle for name. Name should be a value
  90       * returned from lookup_symtab(). So get_symtab_handle() and
  91       * lookup_symtab() are inverse functions.
  92       */
  93
  94 extern long wr_symtab(FILE *fp,t_symtab *symtab);
  95      /* Writes the symbol table symtab to the file, specified by fp.
  96       * The function returns the number of bytes written.
  97       */
  98
  99 extern long rd_symtab(FILE *fp,t_symtab *symtab);
 100      /* Reads the symbol table symtab from the file, specified by fp.
 101       * This will include allocating the needed space. The function
 102       * returns the number of bytes read. The symtab is in the closed
 103       * state afterwards, so no strings can be added to it.
 104       */
 105
 106 extern void pr_symtab(FILE *fp,int indent,const char *title,t_symtab *symtab);
 107      /* This routine prints out a (human) readable representation of
 108       * the symbol table symtab to the file fp. Ident specifies the
 109       * number of spaces the text should be indented. Title is used
 110       * to print a header text.
 111       */
 112
 113 #endif  /* _symtab_h */