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jeremybenn |
/****************************************************************************
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* *
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* GNAT COMPILER COMPONENTS *
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* *
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* S T R I N G T *
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* *
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* C Header File *
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* *
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* Copyright (C) 1992-2007, Free Software Foundation, Inc. *
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* *
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* GNAT is free software; you can redistribute it and/or modify it under *
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* terms of the GNU General Public License as published by the Free Soft- *
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* ware Foundation; either version 3, or (at your option) any later ver- *
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* sion. GNAT is distributed in the hope that it will be useful, but WITH- *
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* OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
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* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
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* for more details. You should have received a copy of the GNU General *
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* Public License distributed with GNAT; see file COPYING3. If not, go to *
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* http://www.gnu.org/licenses for a complete copy of the license. *
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* *
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* GNAT was originally developed by the GNAT team at New York University. *
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* Extensive contributions were provided by Ada Core Technologies Inc. *
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* *
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****************************************************************************/
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/* This file is the C file that corresponds to the Ada package spec
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Stringt. It was created manually from stringt.ads and stringt.adb
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Note: only the access functions are provided, since the tree transformer
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is not allowed to modify the tree or its auxiliary structures.
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This package contains routines for handling the strings table which is
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used to store string constants encountered in the source, and also those
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additional string constants generated by compile time concatenation and
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other similar processing.
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A string constant in this table consists of a series of Char_Code values,
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so that 16-bit character codes can be properly handled if this feature is
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implemented in the scanner.
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There is no guarantee that hashing is used in the implementation. This
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means that the caller cannot count on having the same Id value for two
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identical strings stored separately.
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The String_Id values reference entries in the Strings table, which
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contains String_Entry records that record the length of each stored string
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and its starting location in the String_Chars table. */
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struct String_Entry
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{
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Int String_Index;
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Int Length;
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};
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/* Pointer to string entry vector. This pointer is passed to the tree
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transformer and stored in a global location. */
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extern struct String_Entry *Strings_Ptr;
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/* Pointer to name characters table. This pointer is passed to the tree
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transformer and stored in a global location for access from here. The
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String_Index values are subscripts into this array. */
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extern Char_Code *String_Chars_Ptr;
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/* String_Length returns the length of the specified string. */
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INLINE Int String_Length (String_Id);
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INLINE Int
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String_Length (String_Id Id)
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{
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return Strings_Ptr[Id - First_String_Id].Length;
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}
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/* Get_String_Char obtains the specified character from a stored string. The
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lower bound of stored strings is always 1, so the range of values is 1 to
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String_Length (Id). */
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INLINE Char_Code Get_String_Char (String_Id, Int);
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INLINE Char_Code
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Get_String_Char (String_Id Id, Int Index)
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{
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return
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String_Chars_Ptr
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[Strings_Ptr[Id - First_String_Id].String_Index + Index - 1];
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}
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