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/* Copyright (c) 1991 Regents of the University of California */ |
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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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#include "calcomp.h" |
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|
33 |
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#ifndef NHASH |
34 |
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#define NHASH 521 /* hash size (a prime!) */ |
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#ifndef NHASH |
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#define NHASH 521 /* hash size (a prime!) */ |
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#endif |
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|
37 |
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#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
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#define newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
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|
39 |
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extern char *ecalloc(), *savestr(), *strcpy(); |
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extern char *ecalloc(), *emalloc(), *savestr(), *strcpy(); |
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|
41 |
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static int hash(); |
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|
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static double dvalue(); |
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long eclock = -1; /* value storage timer */ |
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|
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static char context[MAXWORD]; /* current context path */ |
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static char context[MAXWORD+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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#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; |
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#define dname(ep) ((ep)->v.kid->type == SYM ? \ |
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#ifdef FUNCTION |
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EPNODE *curfunc; |
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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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#define dname(ep) ((ep)->v.kid->v.name) |
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#endif |
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double |
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evariable(ep) /* evaluate a variable */ |
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EPNODE *ep; |
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EPNODE *ep; |
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{ |
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register VARDEF *dp = ep->v.ln; |
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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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double val; |
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double val; |
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{ |
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char *qname; |
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register EPNODE *ep1, *ep2; |
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if (*ctx != CNTXMARK) |
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*cpp++ = CNTXMARK; /* make sure there's a mark */ |
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do { |
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if (cpp >= context+MAXWORD-1) { |
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*cpp = '\0'; |
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wputs(context); |
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wputs(": context path too long\n"); |
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return(NULL); |
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} |
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if (cpp >= context+MAXWORD) |
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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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else { |
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register char *nam; |
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int lvl; |
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{ |
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static char nambuf[MAXWORD]; |
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register char *cp = nambuf, *cpp = context; |
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/* check for explicit global */ |
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static char nambuf[MAXWORD+1]; |
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register char *cp = nambuf, *cpp; |
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/* check for explicit local */ |
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if (*nam == CNTXMARK) |
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return(lvl > 0 ? NULL : nam+1); |
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/* check for repeat call */ |
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if (nam == nambuf) |
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return(lvl > 0 ? NULL : nambuf); |
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if (lvl > 0) /* only action is to refuse search */ |
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return(NULL); |
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else |
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nam++; |
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else if (nam == nambuf) /* check for repeat call */ |
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return(lvl > 0 ? NULL : nam); |
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/* copy name to static buffer */ |
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while (*nam) { |
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if (cp >= nambuf+MAXWORD-1) |
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if (cp >= nambuf+MAXWORD) |
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goto toolong; |
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if ((*cp++ = *nam++) == CNTXMARK) |
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cpp = NULL; /* flag a qualified name */ |
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*cp++ = *nam++; |
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} |
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if (cpp == NULL) { |
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/* check for explicit global */ |
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if (cp > nambuf && cp[-1] == CNTXMARK) { |
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if (lvl > 0) |
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return(NULL); /* no higher level */ |
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if (cp[-1] == CNTXMARK) { |
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cp--; cpp = context; /* current context explicitly */ |
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} else |
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cpp = ""; /* else fully qualified */ |
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} else /* else skip the requested levels */ |
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while (lvl-- > 0) { |
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if (!*cpp) |
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return(NULL); /* return NULL if past global level */ |
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while (*++cpp && *cpp != CNTXMARK) |
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; |
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} |
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return(NULL); |
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*--cp = '\0'; |
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return(nambuf); /* already qualified */ |
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} |
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cpp = context; /* else skip the requested levels */ |
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while (lvl-- > 0) { |
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if (!*cpp) |
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return(NULL); /* return NULL if past global level */ |
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while (*++cpp && *cpp != CNTXMARK) |
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; |
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} |
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while (*cpp) { /* copy context to static buffer */ |
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if (cp >= nambuf+MAXWORD-1) |
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if (cp >= nambuf+MAXWORD) |
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goto toolong; |
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*cp++ = *cpp++; |
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} |
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*cp = '\0'; |
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return(nambuf); /* return qualified name */ |
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toolong: |
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*cp = '\0'; |
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eputs(nambuf); |
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eputs(": name too long\n"); |
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quit(1); |
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return(nambuf); /* return qualified name */ |
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} |
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register char *qn; |
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{ |
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while (*qn && *qn != CNTXMARK) /* find context mark */ |
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; |
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qn++; |
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return(!strcmp(qn, context)); |
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} |
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#ifdef OUTCHAN |
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#ifdef OUTCHAN |
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chanout(cs) /* set output channels */ |
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int (*cs)(); |
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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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#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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register VARDEF *vp; |
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if ((vp = varlookup(name)) == NULL) |
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return(NULL); |
312 |
> |
return(NULL); |
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return(vp->def); |
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} |
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varlookup(name) /* look up a variable */ |
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char *name; |
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{ |
321 |
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int lvl = 0; |
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> |
int lvl = 0; |
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register char *qname; |
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register VARDEF *vp; |
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/* find most qualified match */ |
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/* find most qualified match */ |
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while ((qname = qualname(name, lvl++)) != NULL) |
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for (vp = hashtbl[hash(qname)]; vp != NULL; vp = vp->next) |
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if (!strcmp(vp->name, qname)) |
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char *name; |
336 |
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{ |
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register VARDEF *vp; |
338 |
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LIBR *libp; |
344 |
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int hv; |
338 |
> |
int hv; |
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|
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if ((vp = varlookup(name)) != NULL) { |
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vp->nlinks++; |
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return(vp); |
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} |
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#ifdef FUNCTION |
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libp = liblookup(name); |
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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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libp = NULL; |
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vp->lib = NULL; |
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#endif |
350 |
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if (libp == NULL) /* if name not in library */ |
350 |
> |
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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vp = (VARDEF *)emalloc(sizeof(VARDEF)); |
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vp->name = savestr(name); |
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vp->nlinks = 1; |
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vp->def = NULL; |
362 |
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vp->lib = libp; |
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vp->next = hashtbl[hv]; |
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hashtbl[hv] = vp; |
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return(vp); |
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} |
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362 |
+ |
#ifdef FUNCTION |
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libupdate(fn) /* update library links */ |
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char *fn; |
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{ |
366 |
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register int i; |
367 |
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register VARDEF *vp; |
368 |
+ |
/* if fn is NULL then relink all */ |
369 |
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for (i = 0; i < NHASH; i++) |
370 |
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for (vp = hashtbl[i]; vp != NULL; vp = vp->next) |
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if (vp->lib != NULL || fn == NULL || !strcmp(fn, vp->name)) |
372 |
+ |
vp->lib = liblookup(vp->name); |
373 |
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} |
374 |
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#endif |
375 |
+ |
|
376 |
+ |
|
377 |
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varfree(ln) /* release link to variable */ |
378 |
< |
register VARDEF *ln; |
378 |
> |
register VARDEF *ln; |
379 |
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{ |
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register VARDEF *vp; |
381 |
< |
int hv; |
381 |
> |
int hv; |
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|
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if (--ln->nlinks > 0) |
384 |
< |
return; /* still active */ |
384 |
> |
return; /* still active */ |
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hv = hash(ln->name); |
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vp = hashtbl[hv]; |
388 |
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if (vp == ln) |
389 |
< |
hashtbl[hv] = vp->next; |
389 |
> |
hashtbl[hv] = vp->next; |
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else { |
391 |
< |
while (vp->next != ln) /* must be in list */ |
392 |
< |
vp = vp->next; |
393 |
< |
vp->next = ln->next; |
391 |
> |
while (vp->next != ln) /* must be in list */ |
392 |
> |
vp = vp->next; |
393 |
> |
vp->next = ln->next; |
394 |
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} |
395 |
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freestr(ln->name); |
396 |
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efree((char *)ln); |
402 |
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{ |
403 |
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htndx = 0; |
404 |
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htpos = NULL; |
405 |
< |
#ifdef OUTCHAN |
405 |
> |
#ifdef OUTCHAN |
406 |
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ochpos = outchan; |
407 |
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#endif |
408 |
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return(dnext()); |
413 |
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dnext() /* return pointer to next definition */ |
414 |
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{ |
415 |
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register EPNODE *ep; |
416 |
+ |
register char *nm; |
417 |
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|
418 |
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while (htndx < NHASH) { |
419 |
< |
if (htpos == NULL) |
420 |
< |
htpos = hashtbl[htndx++]; |
421 |
< |
while (htpos != NULL) { |
422 |
< |
ep = htpos->def; |
423 |
< |
htpos = htpos->next; |
424 |
< |
if (ep != NULL) |
425 |
< |
return(ep); |
426 |
< |
} |
419 |
> |
if (htpos == NULL) |
420 |
> |
htpos = hashtbl[htndx++]; |
421 |
> |
while (htpos != NULL) { |
422 |
> |
ep = htpos->def; |
423 |
> |
nm = htpos->name; |
424 |
> |
htpos = htpos->next; |
425 |
> |
if (ep != NULL && incontext(nm)) |
426 |
> |
return(ep); |
427 |
> |
} |
428 |
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} |
429 |
< |
#ifdef OUTCHAN |
429 |
> |
#ifdef OUTCHAN |
430 |
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if ((ep = ochpos) != NULL) |
431 |
< |
ochpos = ep->sibling; |
431 |
> |
ochpos = ep->sibling; |
432 |
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return(ep); |
433 |
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#else |
434 |
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return(NULL); |
444 |
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register EPNODE *dp; |
445 |
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446 |
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if ((vp = varlookup(name)) == NULL || vp->def == NULL) |
447 |
< |
return(NULL); |
447 |
> |
return(NULL); |
448 |
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dp = vp->def; |
449 |
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vp->def = dp->sibling; |
450 |
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varfree(vp); |
454 |
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|
455 |
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dpush(nm, ep) /* push on a definition */ |
456 |
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char *nm; |
457 |
< |
register EPNODE *ep; |
457 |
> |
register EPNODE *ep; |
458 |
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{ |
459 |
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register VARDEF *vp; |
460 |
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|
464 |
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} |
465 |
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466 |
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467 |
< |
#ifdef OUTCHAN |
467 |
> |
#ifdef OUTCHAN |
468 |
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addchan(sp) /* add an output channel assignment */ |
469 |
< |
EPNODE *sp; |
469 |
> |
EPNODE *sp; |
470 |
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{ |
471 |
< |
int ch = sp->v.kid->v.chan; |
471 |
> |
int ch = sp->v.kid->v.chan; |
472 |
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register EPNODE *ep, *epl; |
473 |
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|
474 |
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for (epl = NULL, ep = outchan; ep != NULL; epl = ep, ep = ep->sibling) |
505 |
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scan(); |
506 |
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return; |
507 |
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} |
508 |
< |
#ifdef OUTCHAN |
508 |
> |
#ifdef OUTCHAN |
509 |
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if (nextc == '$') { /* channel assignment */ |
510 |
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ep = getchan(); |
511 |
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addchan(ep); |
514 |
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{ /* ordinary definition */ |
515 |
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ep = getdefn(); |
516 |
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qname = qualname(dname(ep), 0); |
517 |
< |
#ifdef REDEFW |
517 |
> |
#ifdef REDEFW |
518 |
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if ((vdef = varlookup(qname)) != NULL) |
519 |
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if (vdef->def != NULL) { |
520 |
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wputs(qname); |
523 |
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else |
524 |
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wputs(": redefined\n"); |
525 |
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} |
526 |
< |
#ifdef FUNCTION |
526 |
> |
#ifdef FUNCTION |
527 |
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else if (ep->v.kid->type == FUNC && vdef->lib != NULL) { |
528 |
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wputs(qname); |
529 |
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wputs(": definition hides library function\n"); |
547 |
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EPNODE * |
548 |
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getdefn() /* A -> SYM = E1 */ |
549 |
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/* SYM : E1 */ |
550 |
< |
/* FUNC(SYM,..) = E1 */ |
550 |
> |
/* FUNC(SYM,..) = E1 */ |
551 |
|
/* FUNC(SYM,..) : E1 */ |
552 |
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{ |
553 |
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register EPNODE *ep1, *ep2; |
554 |
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|
555 |
< |
if (!isalpha(nextc)) |
555 |
> |
if (!isalpha(nextc) && nextc != CNTXMARK) |
556 |
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syntax("illegal variable name"); |
557 |
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|
558 |
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ep1 = newnode(); |
559 |
|
ep1->type = SYM; |
560 |
|
ep1->v.name = savestr(getname()); |
561 |
|
|
562 |
< |
#ifdef FUNCTION |
562 |
> |
#ifdef FUNCTION |
563 |
|
if (nextc == '(') { |
564 |
|
ep2 = newnode(); |
565 |
|
ep2->type = FUNC; |
592 |
|
addekid(ep2, getE1()); |
593 |
|
|
594 |
|
if ( |
595 |
< |
#ifdef FUNCTION |
596 |
< |
ep1->type == SYM && |
595 |
> |
#ifdef FUNCTION |
596 |
> |
ep1->type == SYM && |
597 |
|
#endif |
598 |
|
ep1->sibling->type != NUM) { |
599 |
|
ep1 = newnode(); |
609 |
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} |
610 |
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|
611 |
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|
612 |
< |
#ifdef OUTCHAN |
612 |
> |
#ifdef OUTCHAN |
613 |
|
EPNODE * |
614 |
|
getchan() /* A -> $N = E1 */ |
615 |
|
{ |
646 |
|
static double |
647 |
|
dvalue(name, d) /* evaluate a variable */ |
648 |
|
char *name; |
649 |
< |
EPNODE *d; |
649 |
> |
EPNODE *d; |
650 |
|
{ |
651 |
|
register EPNODE *ep1, *ep2; |
652 |
|
|