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/* Copyright (c) 1986 Regents of the University of California */ |
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|
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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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/* |
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* Compute data values using expression parser |
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* |
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* 1/29/87 Made variables conditional (VARIABLE) |
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* |
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* 5/19/88 Added constant subexpression elimination (RCONST) |
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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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|
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#include <stdio.h> |
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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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|
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#include <errno.h> |
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#include <math.h> |
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#include <stdlib.h> |
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|
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#include "rtmisc.h" |
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#include "rtio.h" |
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#include "rterror.h" |
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#include "calcomp.h" |
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|
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#define MAXLINE 256 /* maximum line length */ |
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#define MAXWORD 64 /* maximum word length */ |
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#define MAXLINE 256 /* maximum line length */ |
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|
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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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|
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#define isid(c) (isalnum(c) || (c) == '_' || (c) == '.') |
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#define isdecimal(c) (isdigit(c) || (c) == '.') |
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|
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#define isdecimal(c) (isdigit(c) || (c) == '.') |
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> |
static double euminus(EPNODE *), eargument(EPNODE *), enumber(EPNODE *); |
41 |
> |
static double echannel(EPNODE *); |
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> |
static double eadd(EPNODE *), esubtr(EPNODE *), |
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emult(EPNODE *), edivi(EPNODE *), |
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epow(EPNODE *); |
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static double ebotch(EPNODE *); |
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|
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extern double atof(), pow(); |
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extern char *fgets(), *savestr(); |
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extern char *emalloc(), *ecalloc(); |
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extern EPNODE *curfunc; |
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extern double efunc(), evariable(); |
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static double euminus(), echannel(), eargument(), enumber(); |
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static double eadd(), esubtr(), emult(), edivi(), epow(); |
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static double ebotch(); |
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extern int errno; |
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> |
unsigned int esupport = /* what to support */ |
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E_VARIABLE | E_FUNCTION ; |
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|
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int eofc = 0; /* optional end-of-file character */ |
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int nextc; /* lookahead character */ |
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|
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double (*eoper[])() = { /* expression operations */ |
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double (*eoper[])(EPNODE *) = { /* expression operations */ |
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ebotch, |
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#ifdef VARIABLE |
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evariable, |
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#else |
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ebotch, |
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#endif |
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enumber, |
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euminus, |
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#ifdef INCHAN |
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echannel, |
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#else |
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ebotch, |
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#endif |
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#ifdef FUNCTION |
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efunc, |
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eargument, |
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#else |
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ebotch, |
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ebotch, |
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#endif |
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ebotch, |
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ebotch, |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
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emult, |
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esubtr, |
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0, |
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edivi, |
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0,0,0,0,0,0,0,0,0,0,0,0,0, |
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0,0,0,0,0,0,0,0,0,0, |
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ebotch, |
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0,0, |
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ebotch, |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
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epow, |
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|
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|
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EPNODE * |
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eparse(expr) /* parse an expression string */ |
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char *expr; |
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eparse( /* parse an expression string */ |
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char *expr |
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) |
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{ |
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EPNODE *ep; |
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|
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initstr(expr, NULL, 0); |
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#if defined(VARIABLE) && defined(FUNCTION) |
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curfunc = NULL; |
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#endif |
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ep = getE1(); |
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if (nextc != EOF) |
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syntax("unexpected character"); |
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|
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|
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double |
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eval(expr) /* evaluate an expression string */ |
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char *expr; |
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eval( /* evaluate an expression string */ |
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char *expr |
106 |
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) |
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{ |
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register EPNODE *ep; |
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double rval; |
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} |
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|
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|
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epfree(epar) /* free a parse tree */ |
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register EPNODE *epar; |
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int |
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epcmp( /* compare two expressions for equivalence */ |
120 |
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register EPNODE *ep1, |
121 |
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register EPNODE *ep2 |
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) |
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{ |
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double d; |
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|
126 |
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if (ep1->type != ep2->type) |
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return(1); |
128 |
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|
129 |
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switch (ep1->type) { |
130 |
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|
131 |
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case VAR: |
132 |
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return(ep1->v.ln != ep2->v.ln); |
133 |
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|
134 |
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case NUM: |
135 |
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if (ep2->v.num == 0) |
136 |
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return(ep1->v.num != 0); |
137 |
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d = ep1->v.num / ep2->v.num; |
138 |
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return((d > 1.000000000001) | (d < 0.999999999999)); |
139 |
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|
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case CHAN: |
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case ARG: |
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return(ep1->v.chan != ep2->v.chan); |
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|
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case '=': |
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case ':': |
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return(epcmp(ep1->v.kid->sibling, ep2->v.kid->sibling)); |
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|
148 |
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case TICK: |
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case SYM: /* should never get this one */ |
150 |
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return(0); |
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|
152 |
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default: |
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ep1 = ep1->v.kid; |
154 |
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ep2 = ep2->v.kid; |
155 |
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while (ep1 != NULL) { |
156 |
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if (ep2 == NULL) |
157 |
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return(1); |
158 |
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if (epcmp(ep1, ep2)) |
159 |
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return(1); |
160 |
+ |
ep1 = ep1->sibling; |
161 |
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ep2 = ep2->sibling; |
162 |
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} |
163 |
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return(ep2 != NULL); |
164 |
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} |
165 |
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} |
166 |
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|
167 |
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|
168 |
+ |
void |
169 |
+ |
epfree( /* free a parse tree */ |
170 |
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register EPNODE *epar |
171 |
+ |
) |
172 |
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{ |
173 |
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register EPNODE *ep; |
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|
175 |
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switch (epar->type) { |
176 |
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|
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#if defined(VARIABLE) || defined(FUNCTION) |
177 |
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case VAR: |
178 |
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varfree(epar->v.ln); |
179 |
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break; |
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#endif |
180 |
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|
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case SYM: |
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freestr(epar->v.name); |
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break; |
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|
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default: |
192 |
< |
for (ep = epar->v.kid; ep != NULL; ep = ep->sibling) |
192 |
> |
while ((ep = epar->v.kid) != NULL) { |
193 |
> |
epar->v.kid = ep->sibling; |
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epfree(ep); |
195 |
+ |
} |
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break; |
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|
198 |
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} |
201 |
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} |
202 |
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|
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/* the following used to be a switch */ |
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#ifdef FUNCTION |
204 |
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static double |
205 |
< |
eargument(ep) |
206 |
< |
EPNODE *ep; |
205 |
> |
eargument( |
206 |
> |
EPNODE *ep |
207 |
> |
) |
208 |
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{ |
209 |
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return(argument(ep->v.chan)); |
210 |
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} |
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#endif |
211 |
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|
212 |
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static double |
213 |
< |
enumber(ep) |
214 |
< |
EPNODE *ep; |
213 |
> |
enumber( |
214 |
> |
EPNODE *ep |
215 |
> |
) |
216 |
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{ |
217 |
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return(ep->v.num); |
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} |
219 |
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|
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static double |
221 |
< |
euminus(ep) |
222 |
< |
EPNODE *ep; |
221 |
> |
euminus( |
222 |
> |
EPNODE *ep |
223 |
> |
) |
224 |
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{ |
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register EPNODE *ep1 = ep->v.kid; |
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|
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return(-evalue(ep1)); |
228 |
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} |
229 |
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|
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#ifdef INCHAN |
230 |
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static double |
231 |
< |
echannel(ep) |
232 |
< |
EPNODE *ep; |
231 |
> |
echannel( |
232 |
> |
EPNODE *ep |
233 |
> |
) |
234 |
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{ |
235 |
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return(chanvalue(ep->v.chan)); |
236 |
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} |
192 |
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#endif |
237 |
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|
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static double |
239 |
< |
eadd(ep) |
240 |
< |
EPNODE *ep; |
239 |
> |
eadd( |
240 |
> |
EPNODE *ep |
241 |
> |
) |
242 |
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{ |
243 |
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register EPNODE *ep1 = ep->v.kid; |
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|
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} |
247 |
|
|
248 |
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static double |
249 |
< |
esubtr(ep) |
250 |
< |
EPNODE *ep; |
249 |
> |
esubtr( |
250 |
> |
EPNODE *ep |
251 |
> |
) |
252 |
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{ |
253 |
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register EPNODE *ep1 = ep->v.kid; |
254 |
|
|
256 |
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} |
257 |
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|
258 |
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static double |
259 |
< |
emult(ep) |
260 |
< |
EPNODE *ep; |
259 |
> |
emult( |
260 |
> |
EPNODE *ep |
261 |
> |
) |
262 |
|
{ |
263 |
|
register EPNODE *ep1 = ep->v.kid; |
264 |
|
|
266 |
|
} |
267 |
|
|
268 |
|
static double |
269 |
< |
edivi(ep) |
270 |
< |
EPNODE *ep; |
269 |
> |
edivi( |
270 |
> |
EPNODE *ep |
271 |
> |
) |
272 |
|
{ |
273 |
|
register EPNODE *ep1 = ep->v.kid; |
274 |
|
double d; |
283 |
|
} |
284 |
|
|
285 |
|
static double |
286 |
< |
epow(ep) |
287 |
< |
EPNODE *ep; |
286 |
> |
epow( |
287 |
> |
EPNODE *ep |
288 |
> |
) |
289 |
|
{ |
290 |
|
register EPNODE *ep1 = ep->v.kid; |
291 |
|
double d; |
292 |
< |
int lasterrno; |
292 |
> |
int lasterrno; |
293 |
|
|
294 |
|
lasterrno = errno; |
295 |
|
errno = 0; |
296 |
|
d = pow(evalue(ep1), evalue(ep1->sibling)); |
297 |
< |
#ifdef IEEE |
298 |
< |
if (!finite(d)) |
299 |
< |
errno = EDOM; |
297 |
> |
#ifdef isnan |
298 |
> |
if (errno == 0) |
299 |
> |
if (isnan(d)) |
300 |
> |
errno = EDOM; |
301 |
> |
else if (isinf(d)) |
302 |
> |
errno = ERANGE; |
303 |
|
#endif |
304 |
< |
if (errno) { |
304 |
> |
if (errno == EDOM || errno == ERANGE) { |
305 |
|
wputs("Illegal power\n"); |
306 |
|
return(0.0); |
307 |
|
} |
310 |
|
} |
311 |
|
|
312 |
|
static double |
313 |
< |
ebotch(ep) |
314 |
< |
EPNODE *ep; |
313 |
> |
ebotch( |
314 |
> |
EPNODE *ep |
315 |
> |
) |
316 |
|
{ |
317 |
|
eputs("Bad expression!\n"); |
318 |
|
quit(1); |
319 |
+ |
return 0.0; /* pro forma return */ |
320 |
|
} |
321 |
|
|
322 |
|
|
323 |
|
EPNODE * |
324 |
< |
ekid(ep, n) /* return pointer to a node's nth kid */ |
325 |
< |
register EPNODE *ep; |
326 |
< |
register int n; |
324 |
> |
ekid( /* return pointer to a node's nth kid */ |
325 |
> |
register EPNODE *ep, |
326 |
> |
register int n |
327 |
> |
) |
328 |
|
{ |
329 |
|
|
330 |
|
for (ep = ep->v.kid; ep != NULL; ep = ep->sibling) |
336 |
|
|
337 |
|
|
338 |
|
int |
339 |
< |
nekids(ep) /* return # of kids for node ep */ |
340 |
< |
register EPNODE *ep; |
339 |
> |
nekids( /* return # of kids for node ep */ |
340 |
> |
register EPNODE *ep |
341 |
> |
) |
342 |
|
{ |
343 |
|
register int n = 0; |
344 |
|
|
349 |
|
} |
350 |
|
|
351 |
|
|
352 |
< |
initfile(fp, fn, ln) /* prepare input file */ |
353 |
< |
FILE *fp; |
354 |
< |
char *fn; |
355 |
< |
int ln; |
352 |
> |
void |
353 |
> |
initfile( /* prepare input file */ |
354 |
> |
FILE *fp, |
355 |
> |
char *fn, |
356 |
> |
int ln |
357 |
> |
) |
358 |
|
{ |
359 |
< |
static char inpbuf[MAXLINE]; |
359 |
> |
static char inpbuf[MAXLINE]; |
360 |
|
|
361 |
|
infp = fp; |
362 |
|
linbuf = inpbuf; |
368 |
|
} |
369 |
|
|
370 |
|
|
371 |
< |
initstr(s, fn, ln) /* prepare input string */ |
372 |
< |
char *s; |
373 |
< |
char *fn; |
374 |
< |
int ln; |
371 |
> |
void |
372 |
> |
initstr( /* prepare input string */ |
373 |
> |
char *s, |
374 |
> |
char *fn, |
375 |
> |
int ln |
376 |
> |
) |
377 |
|
{ |
378 |
|
infp = NULL; |
379 |
|
infile = fn; |
384 |
|
} |
385 |
|
|
386 |
|
|
387 |
< |
scan() /* scan next character */ |
387 |
> |
void |
388 |
> |
getscanpos( /* return current scan position */ |
389 |
> |
char **fnp, |
390 |
> |
int *lnp, |
391 |
> |
char **spp, |
392 |
> |
FILE **fpp |
393 |
> |
) |
394 |
|
{ |
395 |
+ |
if (fnp != NULL) *fnp = infile; |
396 |
+ |
if (lnp != NULL) *lnp = lineno; |
397 |
+ |
if (spp != NULL) *spp = linbuf+linepos; |
398 |
+ |
if (fpp != NULL) *fpp = infp; |
399 |
+ |
} |
400 |
+ |
|
401 |
+ |
|
402 |
+ |
int |
403 |
+ |
scan(void) /* scan next character, return literal next */ |
404 |
+ |
{ |
405 |
+ |
register int lnext = 0; |
406 |
+ |
|
407 |
|
do { |
408 |
|
if (linbuf[linepos] == '\0') |
409 |
|
if (infp == NULL || fgets(linbuf, MAXLINE, infp) == NULL) |
415 |
|
} |
416 |
|
else |
417 |
|
nextc = linbuf[linepos++]; |
418 |
+ |
if (!lnext) |
419 |
+ |
lnext = nextc; |
420 |
+ |
if (nextc == eofc) { |
421 |
+ |
nextc = EOF; |
422 |
+ |
break; |
423 |
+ |
} |
424 |
|
if (nextc == '{') { |
425 |
|
scan(); |
426 |
|
while (nextc != '}') |
431 |
|
scan(); |
432 |
|
} |
433 |
|
} while (isspace(nextc)); |
434 |
+ |
return(lnext); |
435 |
|
} |
436 |
|
|
437 |
|
|
438 |
|
char * |
439 |
< |
ltoa(l) /* convert long to ascii */ |
440 |
< |
long l; |
439 |
> |
long2ascii( /* convert long to ascii */ |
440 |
> |
long l |
441 |
> |
) |
442 |
|
{ |
443 |
< |
static char buf[16]; |
443 |
> |
static char buf[16]; |
444 |
|
register char *cp; |
445 |
< |
int neg = 0; |
445 |
> |
int neg = 0; |
446 |
|
|
447 |
|
if (l == 0) |
448 |
|
return("0"); |
462 |
|
} |
463 |
|
|
464 |
|
|
465 |
< |
syntax(err) /* report syntax error and quit */ |
466 |
< |
char *err; |
465 |
> |
void |
466 |
> |
syntax( /* report syntax error and quit */ |
467 |
> |
char *err |
468 |
> |
) |
469 |
|
{ |
470 |
|
register int i; |
471 |
|
|
473 |
|
if (infile != NULL) eputs(infile); |
474 |
|
if (lineno != 0) { |
475 |
|
eputs(infile != NULL ? ", line " : "line "); |
476 |
< |
eputs(ltoa((long)lineno)); |
476 |
> |
eputs(long2ascii((long)lineno)); |
477 |
|
} |
478 |
< |
eputs(": syntax error:\n"); |
478 |
> |
eputs(":\n"); |
479 |
|
} |
480 |
|
eputs(linbuf); |
481 |
|
if (linbuf[strlen(linbuf)-1] != '\n') |
489 |
|
} |
490 |
|
|
491 |
|
|
492 |
< |
addekid(ep, ekid) /* add a child to ep */ |
493 |
< |
register EPNODE *ep; |
494 |
< |
EPNODE *ekid; |
492 |
> |
void |
493 |
> |
addekid( /* add a child to ep */ |
494 |
> |
register EPNODE *ep, |
495 |
> |
EPNODE *ekid |
496 |
> |
) |
497 |
|
{ |
498 |
|
if (ep->v.kid == NULL) |
499 |
|
ep->v.kid = ekid; |
507 |
|
|
508 |
|
|
509 |
|
char * |
510 |
< |
getname() /* scan an identifier */ |
510 |
> |
getname(void) /* scan an identifier */ |
511 |
|
{ |
512 |
< |
static char str[MAXWORD+1]; |
513 |
< |
register int i; |
512 |
> |
static char str[RMAXWORD+1]; |
513 |
> |
register int i, lnext; |
514 |
|
|
515 |
< |
for (i = 0; i < MAXWORD && isid(nextc); i++, scan()) |
516 |
< |
str[i] = nextc; |
515 |
> |
lnext = nextc; |
516 |
> |
for (i = 0; i < RMAXWORD && isid(lnext); i++, lnext = scan()) |
517 |
> |
str[i] = lnext; |
518 |
|
str[i] = '\0'; |
519 |
+ |
while (isid(lnext)) /* skip rest of name */ |
520 |
+ |
lnext = scan(); |
521 |
|
|
522 |
|
return(str); |
523 |
|
} |
524 |
|
|
525 |
|
|
526 |
|
int |
527 |
< |
getinum() /* scan a positive integer */ |
527 |
> |
getinum(void) /* scan a positive integer */ |
528 |
|
{ |
529 |
< |
register int n; |
529 |
> |
register int n, lnext; |
530 |
|
|
531 |
|
n = 0; |
532 |
< |
while (isdigit(nextc)) { |
533 |
< |
n = n * 10 + nextc - '0'; |
534 |
< |
scan(); |
532 |
> |
lnext = nextc; |
533 |
> |
while (isdigit(lnext)) { |
534 |
> |
n = n * 10 + lnext - '0'; |
535 |
> |
lnext = scan(); |
536 |
|
} |
537 |
|
return(n); |
538 |
|
} |
539 |
|
|
540 |
|
|
541 |
|
double |
542 |
< |
getnum() /* scan a positive float */ |
542 |
> |
getnum(void) /* scan a positive float */ |
543 |
|
{ |
544 |
< |
register int i; |
545 |
< |
char str[MAXWORD+1]; |
544 |
> |
register int i, lnext; |
545 |
> |
char str[RMAXWORD+1]; |
546 |
|
|
547 |
|
i = 0; |
548 |
< |
while (isdigit(nextc) && i < MAXWORD) { |
549 |
< |
str[i++] = nextc; |
550 |
< |
scan(); |
548 |
> |
lnext = nextc; |
549 |
> |
while (isdigit(lnext) && i < RMAXWORD) { |
550 |
> |
str[i++] = lnext; |
551 |
> |
lnext = scan(); |
552 |
|
} |
553 |
< |
if (nextc == '.' && i < MAXWORD) { |
554 |
< |
str[i++] = nextc; |
555 |
< |
scan(); |
556 |
< |
while (isdigit(nextc) && i < MAXWORD) { |
557 |
< |
str[i++] = nextc; |
558 |
< |
scan(); |
553 |
> |
if (lnext == '.' && i < RMAXWORD) { |
554 |
> |
str[i++] = lnext; |
555 |
> |
lnext = scan(); |
556 |
> |
if (i == 1 && !isdigit(lnext)) |
557 |
> |
syntax("badly formed number"); |
558 |
> |
while (isdigit(lnext) && i < RMAXWORD) { |
559 |
> |
str[i++] = lnext; |
560 |
> |
lnext = scan(); |
561 |
|
} |
562 |
|
} |
563 |
< |
if ((nextc == 'e' || nextc == 'E') && i < MAXWORD) { |
564 |
< |
str[i++] = nextc; |
565 |
< |
scan(); |
566 |
< |
if ((nextc == '-' || nextc == '+') && i < MAXWORD) { |
567 |
< |
str[i++] = nextc; |
568 |
< |
scan(); |
563 |
> |
if ((lnext == 'e') | (lnext == 'E') && i < RMAXWORD) { |
564 |
> |
str[i++] = lnext; |
565 |
> |
lnext = scan(); |
566 |
> |
if ((lnext == '-') | (lnext == '+') && i < RMAXWORD) { |
567 |
> |
str[i++] = lnext; |
568 |
> |
lnext = scan(); |
569 |
|
} |
570 |
< |
while (isdigit(nextc) && i < MAXWORD) { |
571 |
< |
str[i++] = nextc; |
572 |
< |
scan(); |
570 |
> |
if (!isdigit(lnext)) |
571 |
> |
syntax("missing exponent"); |
572 |
> |
while (isdigit(lnext) && i < RMAXWORD) { |
573 |
> |
str[i++] = lnext; |
574 |
> |
lnext = scan(); |
575 |
|
} |
576 |
|
} |
577 |
|
str[i] = '\0'; |
581 |
|
|
582 |
|
|
583 |
|
EPNODE * |
584 |
< |
getE1() /* E1 -> E1 ADDOP E2 */ |
585 |
< |
/* E2 */ |
584 |
> |
getE1(void) /* E1 -> E1 ADDOP E2 */ |
585 |
> |
/* E2 */ |
586 |
|
{ |
587 |
|
register EPNODE *ep1, *ep2; |
588 |
|
|
593 |
|
scan(); |
594 |
|
addekid(ep2, ep1); |
595 |
|
addekid(ep2, getE2()); |
596 |
< |
#ifdef RCONST |
597 |
< |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
596 |
> |
if (esupport&E_RCONST && |
597 |
> |
ep1->type == NUM && ep1->sibling->type == NUM) |
598 |
|
ep2 = rconst(ep2); |
500 |
– |
#endif |
599 |
|
ep1 = ep2; |
600 |
|
} |
601 |
|
return(ep1); |
603 |
|
|
604 |
|
|
605 |
|
EPNODE * |
606 |
< |
getE2() /* E2 -> E2 MULOP E3 */ |
607 |
< |
/* E3 */ |
606 |
> |
getE2(void) /* E2 -> E2 MULOP E3 */ |
607 |
> |
/* E3 */ |
608 |
|
{ |
609 |
|
register EPNODE *ep1, *ep2; |
610 |
|
|
615 |
|
scan(); |
616 |
|
addekid(ep2, ep1); |
617 |
|
addekid(ep2, getE3()); |
618 |
< |
#ifdef RCONST |
619 |
< |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
618 |
> |
if (esupport&E_RCONST && |
619 |
> |
ep1->type == NUM && ep1->sibling->type == NUM) |
620 |
|
ep2 = rconst(ep2); |
523 |
– |
#endif |
621 |
|
ep1 = ep2; |
622 |
|
} |
623 |
|
return(ep1); |
625 |
|
|
626 |
|
|
627 |
|
EPNODE * |
628 |
< |
getE3() /* E3 -> E3 ^ E4 */ |
629 |
< |
/* E4 */ |
628 |
> |
getE3(void) /* E3 -> E4 ^ E3 */ |
629 |
> |
/* E4 */ |
630 |
|
{ |
631 |
|
register EPNODE *ep1, *ep2; |
632 |
|
|
633 |
|
ep1 = getE4(); |
634 |
< |
while (nextc == '^') { |
634 |
> |
if (nextc == '^') { |
635 |
|
ep2 = newnode(); |
636 |
|
ep2->type = nextc; |
637 |
|
scan(); |
638 |
|
addekid(ep2, ep1); |
639 |
< |
addekid(ep2, getE4()); |
640 |
< |
#ifdef RCONST |
641 |
< |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
639 |
> |
addekid(ep2, getE3()); |
640 |
> |
if (esupport&E_RCONST && |
641 |
> |
ep1->type == NUM && ep1->sibling->type == NUM) |
642 |
|
ep2 = rconst(ep2); |
643 |
< |
#endif |
547 |
< |
ep1 = ep2; |
643 |
> |
return(ep2); |
644 |
|
} |
645 |
|
return(ep1); |
646 |
|
} |
647 |
|
|
648 |
|
|
649 |
|
EPNODE * |
650 |
< |
getE4() /* E4 -> ADDOP E5 */ |
651 |
< |
/* E5 */ |
650 |
> |
getE4(void) /* E4 -> ADDOP E5 */ |
651 |
> |
/* E5 */ |
652 |
|
{ |
653 |
|
register EPNODE *ep1, *ep2; |
654 |
|
|
659 |
|
ep2->v.num = -ep2->v.num; |
660 |
|
return(ep2); |
661 |
|
} |
662 |
+ |
if (ep2->type == UMINUS) { /* don't generate -(-E5) */ |
663 |
+ |
efree((char *)ep2); |
664 |
+ |
return(ep2->v.kid); |
665 |
+ |
} |
666 |
|
ep1 = newnode(); |
667 |
|
ep1->type = UMINUS; |
668 |
|
addekid(ep1, ep2); |
675 |
|
|
676 |
|
|
677 |
|
EPNODE * |
678 |
< |
getE5() /* E5 -> (E1) */ |
679 |
< |
/* VAR */ |
680 |
< |
/* NUM */ |
681 |
< |
/* $N */ |
682 |
< |
/* FUNC(E1,..) */ |
683 |
< |
/* ARG */ |
678 |
> |
getE5(void) /* E5 -> (E1) */ |
679 |
> |
/* VAR */ |
680 |
> |
/* NUM */ |
681 |
> |
/* $N */ |
682 |
> |
/* FUNC(E1,..) */ |
683 |
> |
/* ARG */ |
684 |
|
{ |
685 |
< |
int i; |
686 |
< |
register EPNODE *ep1, *ep2; |
685 |
> |
int i; |
686 |
> |
char *nam; |
687 |
> |
register EPNODE *ep1, *ep2; |
688 |
|
|
689 |
< |
if (nextc == '(') { |
690 |
< |
scan(); |
691 |
< |
ep1 = getE1(); |
692 |
< |
if (nextc != ')') |
693 |
< |
syntax("')' expected"); |
694 |
< |
scan(); |
695 |
< |
return(ep1); |
696 |
< |
} |
689 |
> |
if (nextc == '(') { |
690 |
> |
scan(); |
691 |
> |
ep1 = getE1(); |
692 |
> |
if (nextc != ')') |
693 |
> |
syntax("')' expected"); |
694 |
> |
scan(); |
695 |
> |
return(ep1); |
696 |
> |
} |
697 |
|
|
698 |
< |
#ifdef INCHAN |
699 |
< |
if (nextc == '$') { |
700 |
< |
scan(); |
701 |
< |
ep1 = newnode(); |
702 |
< |
ep1->type = CHAN; |
703 |
< |
ep1->v.chan = getinum(); |
704 |
< |
return(ep1); |
604 |
< |
} |
605 |
< |
#endif |
698 |
> |
if (esupport&E_INCHAN && nextc == '$') { |
699 |
> |
scan(); |
700 |
> |
ep1 = newnode(); |
701 |
> |
ep1->type = CHAN; |
702 |
> |
ep1->v.chan = getinum(); |
703 |
> |
return(ep1); |
704 |
> |
} |
705 |
|
|
706 |
< |
#if defined(VARIABLE) || defined(FUNCTION) |
707 |
< |
if (isalpha(nextc)) { |
708 |
< |
ep1 = newnode(); |
709 |
< |
ep1->type = VAR; |
710 |
< |
ep1->v.ln = varinsert(getname()); |
711 |
< |
|
712 |
< |
#if defined(VARIABLE) && defined(FUNCTION) |
713 |
< |
if (curfunc != NULL) |
714 |
< |
for (i = 1, ep2 = curfunc->v.kid->sibling; |
715 |
< |
ep2 != NULL; i++, ep2 = ep2->sibling) |
716 |
< |
if (!strcmp(ep2->v.name, ep1->v.ln->name)) { |
717 |
< |
epfree(ep1); |
718 |
< |
ep1 = newnode(); |
719 |
< |
ep1->type = ARG; |
720 |
< |
ep1->v.chan = i; |
721 |
< |
break; |
706 |
> |
if (esupport&(E_VARIABLE|E_FUNCTION) && |
707 |
> |
(isalpha(nextc) || nextc == CNTXMARK)) { |
708 |
> |
nam = getname(); |
709 |
> |
ep1 = NULL; |
710 |
> |
if ((esupport&(E_VARIABLE|E_FUNCTION)) == (E_VARIABLE|E_FUNCTION) |
711 |
> |
&& curfunc != NULL) |
712 |
> |
for (i = 1, ep2 = curfunc->v.kid->sibling; |
713 |
> |
ep2 != NULL; i++, ep2 = ep2->sibling) |
714 |
> |
if (!strcmp(ep2->v.name, nam)) { |
715 |
> |
ep1 = newnode(); |
716 |
> |
ep1->type = ARG; |
717 |
> |
ep1->v.chan = i; |
718 |
> |
break; |
719 |
> |
} |
720 |
> |
if (ep1 == NULL) { |
721 |
> |
ep1 = newnode(); |
722 |
> |
ep1->type = VAR; |
723 |
> |
ep1->v.ln = varinsert(nam); |
724 |
|
} |
725 |
< |
#endif |
726 |
< |
#ifdef FUNCTION |
727 |
< |
if (nextc == '(') { |
728 |
< |
ep2 = newnode(); |
729 |
< |
ep2->type = FUNC; |
730 |
< |
addekid(ep2, ep1); |
731 |
< |
ep1 = ep2; |
732 |
< |
do { |
733 |
< |
scan(); |
734 |
< |
addekid(ep1, getE1()); |
735 |
< |
} while (nextc == ','); |
736 |
< |
if (nextc != ')') |
737 |
< |
syntax("')' expected"); |
738 |
< |
scan(); |
725 |
> |
if (esupport&E_FUNCTION && nextc == '(') { |
726 |
> |
ep2 = newnode(); |
727 |
> |
ep2->type = FUNC; |
728 |
> |
addekid(ep2, ep1); |
729 |
> |
ep1 = ep2; |
730 |
> |
do { |
731 |
> |
scan(); |
732 |
> |
addekid(ep1, getE1()); |
733 |
> |
} while (nextc == ','); |
734 |
> |
if (nextc != ')') |
735 |
> |
syntax("')' expected"); |
736 |
> |
scan(); |
737 |
> |
} else if (!(esupport&E_VARIABLE)) |
738 |
> |
syntax("'(' expected"); |
739 |
> |
if (esupport&E_RCONST && isconstvar(ep1)) |
740 |
> |
ep1 = rconst(ep1); |
741 |
> |
return(ep1); |
742 |
|
} |
639 |
– |
#ifndef VARIABLE |
640 |
– |
else |
641 |
– |
syntax("'(' expected"); |
642 |
– |
#endif |
643 |
– |
#endif |
644 |
– |
return(ep1); |
645 |
– |
} |
646 |
– |
#endif |
743 |
|
|
744 |
< |
if (isdecimal(nextc)) { |
745 |
< |
ep1 = newnode(); |
746 |
< |
ep1->type = NUM; |
747 |
< |
ep1->v.num = getnum(); |
748 |
< |
return(ep1); |
749 |
< |
} |
750 |
< |
syntax("unexpected character"); |
744 |
> |
if (isdecimal(nextc)) { |
745 |
> |
ep1 = newnode(); |
746 |
> |
ep1->type = NUM; |
747 |
> |
ep1->v.num = getnum(); |
748 |
> |
return(ep1); |
749 |
> |
} |
750 |
> |
syntax("unexpected character"); |
751 |
> |
return NULL; /* pro forma return */ |
752 |
|
} |
753 |
|
|
754 |
|
|
658 |
– |
#ifdef RCONST |
755 |
|
EPNODE * |
756 |
< |
rconst(epar) /* reduce a constant expression */ |
757 |
< |
register EPNODE *epar; |
756 |
> |
rconst( /* reduce a constant expression */ |
757 |
> |
register EPNODE *epar |
758 |
> |
) |
759 |
|
{ |
760 |
|
register EPNODE *ep; |
761 |
|
|
763 |
|
ep->type = NUM; |
764 |
|
errno = 0; |
765 |
|
ep->v.num = evalue(epar); |
766 |
< |
if (errno) |
767 |
< |
syntax("bad constant expression"); |
766 |
> |
if (errno == EDOM || errno == ERANGE) |
767 |
> |
syntax("bad constant expression"); |
768 |
|
epfree(epar); |
769 |
|
|
770 |
|
return(ep); |
771 |
|
} |
772 |
< |
#endif |
772 |
> |
|
773 |
> |
|
774 |
> |
int |
775 |
> |
isconstvar( /* is ep linked to a constant expression? */ |
776 |
> |
register EPNODE *ep |
777 |
> |
) |
778 |
> |
{ |
779 |
> |
register EPNODE *ep1; |
780 |
> |
|
781 |
> |
if (esupport&E_FUNCTION && ep->type == FUNC) { |
782 |
> |
if (!isconstfun(ep->v.kid)) |
783 |
> |
return(0); |
784 |
> |
for (ep1 = ep->v.kid->sibling; ep1 != NULL; ep1 = ep1->sibling) |
785 |
> |
if (ep1->type != NUM && !isconstfun(ep1)) |
786 |
> |
return(0); |
787 |
> |
return(1); |
788 |
> |
} |
789 |
> |
if (ep->type != VAR) |
790 |
> |
return(0); |
791 |
> |
ep1 = ep->v.ln->def; |
792 |
> |
if (ep1 == NULL || ep1->type != ':') |
793 |
> |
return(0); |
794 |
> |
if (esupport&E_FUNCTION && ep1->v.kid->type != SYM) |
795 |
> |
return(0); |
796 |
> |
return(1); |
797 |
> |
} |
798 |
> |
|
799 |
> |
|
800 |
> |
int |
801 |
> |
isconstfun( /* is ep linked to a constant function? */ |
802 |
> |
register EPNODE *ep |
803 |
> |
) |
804 |
> |
{ |
805 |
> |
register EPNODE *dp; |
806 |
> |
register LIBR *lp; |
807 |
> |
|
808 |
> |
if (ep->type != VAR) |
809 |
> |
return(0); |
810 |
> |
if ((dp = ep->v.ln->def) != NULL) { |
811 |
> |
if (dp->v.kid->type == FUNC) |
812 |
> |
return(dp->type == ':'); |
813 |
> |
else |
814 |
> |
return(0); /* don't identify masked library functions */ |
815 |
> |
} |
816 |
> |
if ((lp = ep->v.ln->lib) != NULL) |
817 |
> |
return(lp->atyp == ':'); |
818 |
> |
return(0); |
819 |
> |
} |