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/* Copyright (c) 1992 Regents of the University of California */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* Store variable definitions. |
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* |
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* 4/23/91 Added ':' assignment for constant expressions |
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* |
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* 8/7/91 Added optional context path to append to variable names |
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* |
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* 5/17/2001 Fixed clock counter wrapping behavior |
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* |
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* 2/19/03 Eliminated conditional compiles in favor of esupport extern. |
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*/ |
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#include "copyright.h" |
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#include <stdio.h> |
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#include <string.h> |
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#include <ctype.h> |
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#include "calcomp.h" |
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#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
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extern char *ecalloc(), *emalloc(), *savestr(), *strcpy(); |
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static double dvalue(); |
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#define MAXCLOCK (1L<<31) /* clock wrap value */ |
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unsigned long eclock = 0; /* value storage timer */ |
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static char context[MAXWORD+1]; /* current context path */ |
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#define MAXCNTX 1023 /* maximum context length */ |
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static char context[MAXCNTX+1]; /* current context path */ |
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static VARDEF *hashtbl[NHASH]; /* definition list */ |
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static int htndx; /* index for */ |
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static VARDEF *htpos; /* ...dfirst() and */ |
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#ifdef OUTCHAN |
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static EPNODE *ochpos; /* ...dnext */ |
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static EPNODE *outchan; |
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#endif |
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#ifdef FUNCTION |
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EPNODE *curfunc = NULL; |
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#define dname(ep) ((ep)->v.kid->type == SYM ? \ |
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(ep)->v.kid->v.name : \ |
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(ep)->v.kid->v.kid->v.name) |
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#else |
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#define dname(ep) ((ep)->v.kid->v.name) |
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#endif |
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void |
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fcompile(fname) /* get definitions from a file */ |
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char *fname; |
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{ |
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} |
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void |
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scompile(str, fn, ln) /* get definitions from a string */ |
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char *str; |
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char *fn; |
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} |
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void |
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varset(vname, assign, val) /* set a variable's value */ |
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char *vname; |
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int assign; |
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} |
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void |
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dclear(name) /* delete variable definitions of name */ |
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char *name; |
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{ |
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} |
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void |
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dremove(name) /* delete all definitions of name */ |
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char *name; |
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{ |
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} |
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int |
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vardefined(name) /* return non-zero if variable defined */ |
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char *name; |
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{ |
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cpp = context; /* start context with mark */ |
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*cpp++ = CNTXMARK; |
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do { /* carefully copy new context */ |
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if (cpp >= context+MAXWORD) |
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if (cpp >= context+MAXCNTX) |
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break; /* just copy what we can */ |
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if (isid(*ctx)) |
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*cpp++ = *ctx++; |
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pushcontext(ctx) /* push on another context */ |
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char *ctx; |
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{ |
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extern char *strncpy(), *strcpy(); |
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char oldcontext[MAXWORD+1]; |
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char oldcontext[MAXCNTX+1]; |
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register int n; |
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strcpy(oldcontext, context); /* save old context */ |
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setcontext(ctx); /* set new context */ |
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n = strlen(context); /* tack on old */ |
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if (n+strlen(oldcontext) > MAXWORD) { |
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strncpy(context+n, oldcontext, MAXWORD-n); |
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context[MAXWORD] = '\0'; |
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if (n+strlen(oldcontext) > MAXCNTX) { |
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strncpy(context+n, oldcontext, MAXCNTX-n); |
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context[MAXCNTX] = '\0'; |
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} else |
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strcpy(context+n, oldcontext); |
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return(context); |
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} |
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int |
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incontext(qn) /* is qualified name in current context? */ |
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register char *qn; |
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{ |
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} |
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#ifdef OUTCHAN |
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void |
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chanout(cs) /* set output channels */ |
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int (*cs)(); |
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{ |
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(*cs)(ep->v.kid->v.chan, evalue(ep->v.kid->sibling)); |
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} |
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#endif |
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void |
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dcleanup(lvl) /* clear definitions (0->vars,1->output,2->consts) */ |
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int lvl; |
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{ |
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dremove(vp->name); |
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else |
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dclear(vp->name); |
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#ifdef OUTCHAN |
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if (lvl >= 1) { |
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for (ep = outchan; ep != NULL; ep = ep->sibling) |
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epfree(ep); |
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outchan = NULL; |
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} |
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#endif |
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} |
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return(vp); |
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} |
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vp = (VARDEF *)emalloc(sizeof(VARDEF)); |
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#ifdef FUNCTION |
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vp->lib = liblookup(name); |
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#else |
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vp->lib = NULL; |
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#endif |
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if (vp->lib == NULL) /* if name not in library */ |
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name = qualname(name, 0); /* use fully qualified version */ |
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hv = hash(name); |
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} |
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#ifdef FUNCTION |
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void |
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libupdate(fn) /* update library links */ |
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char *fn; |
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{ |
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if (vp->lib != NULL || fn == NULL || !strcmp(fn, vp->name)) |
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vp->lib = liblookup(vp->name); |
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} |
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#endif |
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void |
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varfree(ln) /* release link to variable */ |
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register VARDEF *ln; |
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{ |
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{ |
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htndx = 0; |
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htpos = NULL; |
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#ifdef OUTCHAN |
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ochpos = outchan; |
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#endif |
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return(dnext()); |
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} |
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return(ep); |
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} |
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} |
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#ifdef OUTCHAN |
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if ((ep = ochpos) != NULL) |
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ochpos = ep->sibling; |
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return(ep); |
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#else |
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return(NULL); |
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#endif |
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} |
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} |
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void |
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dpush(nm, ep) /* push on a definition */ |
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char *nm; |
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register EPNODE *ep; |
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} |
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#ifdef OUTCHAN |
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void |
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addchan(sp) /* add an output channel assignment */ |
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EPNODE *sp; |
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{ |
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sp->sibling = NULL; |
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} |
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#endif |
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void |
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getstatement() /* get next statement */ |
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{ |
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register EPNODE *ep; |
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scan(); |
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return; |
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} |
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#ifdef OUTCHAN |
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if (nextc == '$') { /* channel assignment */ |
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if (esupport&E_OUTCHAN && |
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nextc == '$') { /* channel assignment */ |
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ep = getchan(); |
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addchan(ep); |
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} else |
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#endif |
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{ /* ordinary definition */ |
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} else { /* ordinary definition */ |
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ep = getdefn(); |
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qname = qualname(dname(ep), 0); |
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#ifdef REDEFW |
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if ((vdef = varlookup(qname)) != NULL) |
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if (esupport&E_REDEFW && (vdef = varlookup(qname)) != NULL) |
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if (vdef->def != NULL && epcmp(ep, vdef->def)) { |
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wputs(qname); |
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if (vdef->def->type == ':') |
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wputs(": redefined constant expression\n"); |
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else |
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wputs(": redefined\n"); |
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} |
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#ifdef FUNCTION |
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else if (ep->v.kid->type == FUNC && vdef->lib != NULL) { |
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} else if (ep->v.kid->type == FUNC && vdef->lib != NULL) { |
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wputs(qname); |
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wputs(": definition hides library function\n"); |
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} |
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#endif |
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#endif |
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if (ep->type == ':') |
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dremove(qname); |
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else |
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ep1->type = SYM; |
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ep1->v.name = savestr(getname()); |
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#ifdef FUNCTION |
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if (nextc == '(') { |
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if (esupport&E_FUNCTION && nextc == '(') { |
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ep2 = newnode(); |
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ep2->type = FUNC; |
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addekid(ep2, ep1); |
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scan(); |
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curfunc = ep1; |
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} |
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#endif |
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if (nextc != '=' && nextc != ':') |
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syntax("'=' or ':' expected"); |
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addekid(ep2, ep1); |
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addekid(ep2, getE1()); |
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if ( |
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#ifdef FUNCTION |
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ep1->type == SYM && |
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#endif |
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ep1->sibling->type != NUM) { |
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if (ep1->type == SYM && ep1->sibling->type != NUM) { |
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ep1 = newnode(); |
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ep1->type = TICK; |
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ep1->v.tick = 0; |
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ep1->type = NUM; |
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addekid(ep2, ep1); |
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} |
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#ifdef FUNCTION |
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curfunc = NULL; |
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#endif |
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return(ep2); |
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} |
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#ifdef OUTCHAN |
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EPNODE * |
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getchan() /* A -> $N = E1 */ |
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{ |
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return(ep2); |
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} |
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#endif |
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if (ep1->type == NUM) |
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return(ep1->v.num); /* return if number */ |
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ep2 = ep1->sibling; /* check time */ |
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if (ep2->v.tick == 0 || ep2->v.tick < eclock) { |
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ep2->v.tick = d->type == ':' ? ~0L : eclock; |
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if (eclock >= MAXCLOCK) |
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eclock = 1; /* wrap clock counter */ |
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if (ep2->v.tick < MAXCLOCK && |
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ep2->v.tick == 0 | ep2->v.tick != eclock) { |
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ep2->v.tick = d->type == ':' ? MAXCLOCK : eclock; |
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ep2 = ep2->sibling; |
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ep2->v.num = evalue(ep1); /* needs new value */ |
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} else |