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154 lines
3.8 KiB
154 lines
3.8 KiB
/*****************************************************************************
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*
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* define.c
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*
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* Builtins related to object definitions.
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*
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*****************************************************************************/
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#include "m4.h"
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/*****************************************************************************
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*
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* opDefineOrPushdef
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*
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* Common worker for opDefine and opPushdef.
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*
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* If we are not pushing, then we must pop off the previous value
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* in order to free its memory, before pushing the new definition.
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*
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* QUIRK! GNU m4 emits a warning if $# > 2. AT&T silently ignores
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* extra arguments. I side with AT&T on this one.
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*
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* QUIRK! GNU m4 emits `$0' if $# = 0. AT&T silently ignores
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* the entire macro call. I side with GNU on this one.
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*
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* WARNING! main.c::DefinePtsz assumes that we don't look at
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* argv[0] if the correct number of parameters are passed!
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*
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*****************************************************************************/
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void STDCALL
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opDefineOrPushdef(ARGV argv, BOOL fPush)
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{
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if (ctokArgv > 0) {
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/*
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* Ensure that we don't mess with argv[0].
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*/
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D(SIG sigOld = argv[0].sig);
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D(argv[0].sig = 0);
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if (fIdentPtok(ptokArgv(1))) {
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PMAC pmac = pmacGetPtok(ptokArgv(1));
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if (!fPush) {
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if (pmac->pval) {
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PopdefPmac(pmac); /* Pop off previous value */
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}
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}
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PushdefPmacPtok(pmac, ptokArgv(2));
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#ifdef STRICT_M4
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if (ctokArgv > 2) {
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Warn("extra arguments ignored");
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}
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#endif
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} else {
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Die("invalid macro name");
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}
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D(argv[0].sig = sigOld);
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} else {
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PushQuotedPtok(ptokArgv(0));
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}
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}
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/*****************************************************************************
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*
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* opDefine
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*
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* Set the expansion of $1 to $2, destroying any previous value.
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*
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* opPushdef
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*
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* Same as opDefine, except pushes the previous value.
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*
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*****************************************************************************/
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DeclareOp(opDefine)
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{
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opDefineOrPushdef(argv, 0);
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}
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DeclareOp(opPushdef)
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{
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opDefineOrPushdef(argv, 1);
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}
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/*****************************************************************************
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*
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* opPopdef
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*
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* Restores the most recently pushed definition.
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*
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* If the macro name is invalid, fail silently.
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*
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*****************************************************************************/
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DeclareOpc(opcPopdef)
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{
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PMAC pmac = pmacFindPtok(ptok);
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if (pmac) {
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Assert(pmac->pval);
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if (pmac->pval->pvalPrev) {
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PopdefPmac(pmac);
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} else {
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FreePmac(pmac);
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}
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}
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}
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DeclareOp(opPopdef)
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{
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EachOpcArgvDw(opcPopdef, argv, 0);
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}
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/*****************************************************************************
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*
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* opUndefine
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*
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* Removes the definitions of all its arguments.
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*
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*****************************************************************************/
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DeclareOpc(opcUndefine)
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{
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PMAC pmac = pmacFindPtok(ptok);
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if (pmac) {
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FreePmac(pmac);
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}
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}
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DeclareOp(opUndefine)
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{
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EachOpcArgvDw(opcUndefine, argv, 0);
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}
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/*****************************************************************************
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*
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* opDefn
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*
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* Returns the quoted definition of its argument(s), concatenated
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* from left to right.
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*
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*****************************************************************************/
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DeclareOpc(opcDefn)
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{
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PMAC pmac = pmacFindPtok(ptok);
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if (pmac) {
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PushQuotedPtok(&pmac->pval->tok);
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}
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}
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DeclareOp(opDefn)
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{
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EachReverseOpcArgvDw(opcDefn, argv, 0);
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}
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