src/gromacs/topology/symtab.h

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  37 #ifndef GMX_TOPOLOGY_SYMTAB_H
  38 #define GMX_TOPOLOGY_SYMTAB_H
  39
  40 #include <stdio.h>
  41
  42 typedef struct t_symbuf
  43 {
  44     int               bufsize;
  45     char            **buf;
  46     struct t_symbuf  *next;
  47 } t_symbuf;
  48
  49 typedef struct t_symtab
  50 {
  51     int       nr;
  52     t_symbuf *symbuf;
  53 } t_symtab;
  54
  55 /*
  56  * This module handles symbol table manipulation. All text strings
  57  * needed by an application are allocated only once. All references
  58  * to these text strings use handles returned from the put_symtab()
  59  * routine. These handles can easily be converted to address independent
  60  * values by invoking lookup_symtab(). So when writing structures to
  61  * a file which contains text strings, this value can be written in stead
  62  * of the text string or its address. This value can easily be converted
  63  * back to a text string handle by get_symtab_handle().
  64  */
  65
  66 void open_symtab(t_symtab *symtab);
  67 /* Initialises the symbol table symtab.
  68  */
  69
  70 void close_symtab(t_symtab *symtab);
  71 /* Undoes the effect of open_symtab(), after invoking this function,
  72  * no value can be added to the symbol table, only values can be
  73  * retrieved using get_symtab().
  74  *
  75  * Note that this does no work.
  76  */
  77
  78 /*! \brief Returns a deep copy of \c symtab. */
  79 t_symtab *duplicateSymtab(const t_symtab *symtab);
  80
  81 void free_symtab(t_symtab *symtab);
  82 /* Frees the space allocated by the symbol table itself */
  83
  84 void done_symtab(t_symtab *symtab);
  85 /* Frees the space allocated by the symbol table, including all
  86  * entries in it */
  87
  88 char **put_symtab(t_symtab *symtab, const char *name);
  89 /* Enters a string into the symbol table symtab, if it was not
  90  * available, a reference to a copy is returned else a reference
  91  * to the earlier entered value is returned. Strings are trimmed
  92  * of spaces.
  93  */
  94
  95 int lookup_symtab(t_symtab *symtab, char **name);
  96 /* Returns a unique handle for **name, without a memory reference.
  97  * It is a failure when name cannot be found in the symbol table,
  98  * it should be entered before with put_symtab().
  99  */
 100
 101 char **get_symtab_handle(t_symtab *symtab, int name);
 102 /* Returns a text string handle for name. Name should be a value
 103  * returned from lookup_symtab(). So get_symtab_handle() and
 104  * lookup_symtab() are inverse functions.
 105  */
 106
 107 long wr_symtab(FILE *fp, t_symtab *symtab);
 108 /* Writes the symbol table symtab to the file, specified by fp.
 109  * The function returns the number of bytes written.
 110  */
 111
 112 long rd_symtab(FILE *fp, t_symtab *symtab);
 113 /* Reads the symbol table symtab from the file, specified by fp.
 114  * This will include allocating the needed space. The function
 115  * returns the number of bytes read. The symtab is in the closed
 116  * state afterwards, so no strings can be added to it.
 117  */
 118
 119 void pr_symtab(FILE *fp, int indent, const char *title, t_symtab *symtab);
 120 /* This routine prints out a (human) readable representation of
 121  * the symbol table symtab to the file fp. Ident specifies the
 122  * number of spaces the text should be indented. Title is used
 123  * to print a header text.
 124  */
 125
 126 #endif