74 lines
1.8 KiB
C++
74 lines
1.8 KiB
C++
// Macro.C - contains routines that have to do with macros
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//
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// Copyright (c) 1988-1991, Microsoft Corporation. All Rights Reserved.
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//
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// Purpose:
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// Contains routines that have to do with macros
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//
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// Revision History:
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// 16-May-1991 SB Created from routines that existed elsewhere
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#include "precomp.h"
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#pragma hdrstop
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static STRINGLIST **lastMacroChain = NULL;
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// findMacro - look up a string in a hash table
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//
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// Look up a macro name in a hash table and return the entry
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// or NULL.
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// If a macro and undefined, return NULL.
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MACRODEF * findMacro(char *str)
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{
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unsigned n;
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char *string = str;
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STRINGLIST *found;
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if (*string) {
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for (n = 0; *string; n += *string++); //Hash
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n %= MAXMACRO;
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#if defined(STATISTICS)
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CntfindMacro++;
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#endif
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lastMacroChain = (STRINGLIST **)¯oTable[n];
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for (found = *lastMacroChain; found; found = found->next) {
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#if defined(STATISTICS)
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CntmacroChains++;
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#endif
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if (!_tcscmp(found->text, str)) {
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return((((MACRODEF *)found)->flags & M_UNDEFINED) ? NULL : (MACRODEF *)found);
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}
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}
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} else {
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// set lastMacroChain, even for an empty name
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lastMacroChain = (STRINGLIST **)¯oTable[0];
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}
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return(NULL);
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}
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// insertMacro
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//
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// Macro insertion requires that we JUST did a findMacro, which action set lastMacroChain.
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void insertMacro(STRINGLIST * p)
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{
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#ifdef STATISTICS
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CntinsertMacro++;
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#endif
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assert(lastMacroChain != NULL);
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prependItem(lastMacroChain, p);
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lastMacroChain = NULL;
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}
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// 16/May/92 Bryant Init the macro table to a known state before
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// continuing.
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void initMacroTable(MACRODEF *table[])
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{
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unsigned num;
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for (num = 0; num < MAXMACRO; num++) {
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table[num] = NULL;
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}
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}
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