1 /****************************************************************
2 Copyright (C) Lucent Technologies 1997
5 Permission to use, copy, modify, and distribute this software and
6 its documentation for any purpose and without fee is hereby
7 granted, provided that the above copyright notice appear in all
8 copies and that both that the copyright notice and this
9 permission notice and warranty disclaimer appear in supporting
10 documentation, and that the name Lucent Technologies or any of
11 its entities not be used in advertising or publicity pertaining
12 to distribution of the software without specific, written prior
15 LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
16 INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
17 IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
18 SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
19 WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
20 IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
21 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
23 ****************************************************************/
32 #define FULLTAB 2 /* rehash when table gets this x full */
33 #define GROWTAB 4 /* grow table by this factor */
35 Array *symtab; /* main symbol table */
37 char **FS; /* initial field sep */
38 char **RS; /* initial record sep */
39 char **OFS; /* output field sep */
40 char **ORS; /* output record sep */
41 char **OFMT; /* output format for numbers */
42 char **CONVFMT; /* format for conversions in getsval */
43 Awkfloat *NF; /* number of fields in current record */
44 Awkfloat *NR; /* number of current record */
45 Awkfloat *FNR; /* number of current record in current file */
46 char **FILENAME; /* current filename argument */
47 Awkfloat *AARGC; /* number of arguments from command line */
48 char **SUBSEP; /* subscript separator for a[i,j,k]; default \034 */
49 Awkfloat *RSTART; /* start of re matched with ~; origin 1 (!) */
50 Awkfloat *RLENGTH; /* length of same */
54 Cell *fnrloc; /* FNR */
55 Array *ARGVtab; /* symbol table containing ARGV[...] */
56 Array *ENVtab; /* symbol table containing ENVIRON[...] */
57 Cell *rstartloc; /* RSTART */
58 Cell *rlengthloc; /* RLENGTH */
59 Cell *symtabloc; /* SYMTAB */
61 Cell *nullloc; /* a guaranteed empty cell */
62 Node *nullnode; /* zero&null, converted into a node for comparisons */
67 void syminit(void) /* initialize symbol table with builtin vars */
69 literal0 = setsymtab("0", "0", 0.0, NUM|STR|CON|DONTFREE, symtab);
70 /* this is used for if(x)... tests: */
71 nullloc = setsymtab("$zero&null", "", 0.0, NUM|STR|CON|DONTFREE, symtab);
72 nullnode = celltonode(nullloc, CCON);
74 FS = &setsymtab("FS", " ", 0.0, STR|DONTFREE, symtab)->sval;
75 RS = &setsymtab("RS", "\n", 0.0, STR|DONTFREE, symtab)->sval;
76 OFS = &setsymtab("OFS", " ", 0.0, STR|DONTFREE, symtab)->sval;
77 ORS = &setsymtab("ORS", "\n", 0.0, STR|DONTFREE, symtab)->sval;
78 OFMT = &setsymtab("OFMT", "%.6g", 0.0, STR|DONTFREE, symtab)->sval;
79 CONVFMT = &setsymtab("CONVFMT", "%.6g", 0.0, STR|DONTFREE, symtab)->sval;
80 FILENAME = &setsymtab("FILENAME", "", 0.0, STR|DONTFREE, symtab)->sval;
81 nfloc = setsymtab("NF", "", 0.0, NUM, symtab);
83 nrloc = setsymtab("NR", "", 0.0, NUM, symtab);
85 fnrloc = setsymtab("FNR", "", 0.0, NUM, symtab);
87 SUBSEP = &setsymtab("SUBSEP", "\034", 0.0, STR|DONTFREE, symtab)->sval;
88 rstartloc = setsymtab("RSTART", "", 0.0, NUM, symtab);
89 RSTART = &rstartloc->fval;
90 rlengthloc = setsymtab("RLENGTH", "", 0.0, NUM, symtab);
91 RLENGTH = &rlengthloc->fval;
92 symtabloc = setsymtab("SYMTAB", "", 0.0, ARR, symtab);
93 symtabloc->sval = (char *) symtab;
96 void arginit(int ac, char **av) /* set up ARGV and ARGC */
102 AARGC = &setsymtab("ARGC", "", (Awkfloat) ac, NUM, symtab)->fval;
103 cp = setsymtab("ARGV", "", 0.0, ARR, symtab);
104 ARGVtab = makesymtab(NSYMTAB); /* could be (int) ARGC as well */
105 cp->sval = (char *) ARGVtab;
106 for (i = 0; i < ac; i++) {
107 sprint(temp, "%d", i);
109 setsymtab(temp, *av, atof(*av), STR|NUM, ARGVtab);
111 setsymtab(temp, *av, 0.0, STR, ARGVtab);
116 void envinit(void) /* set up ENVIRON variable */
122 ENVtab = makesymtab(NSYMTAB);
123 if ((fd = open("/env", OREAD)) < 0)
127 while((n = dirread(fd, &buf)) > 0) {
128 for (i = 0; i < n; i++) {
130 if(strncmp(k, "fn#", 3) == 0)
132 if ((v = getenv(k)) == nil)
135 setsymtab(k, v, atof(v), STR|NUM, ENVtab);
137 setsymtab(k, v, 0.0, STR, ENVtab);
147 Array *makesymtab(int n) /* make a new symbol table */
152 ap = (Array *) malloc(sizeof(Array));
153 tp = (Cell **) calloc(n, sizeof(Cell *));
154 if (ap == nil || tp == nil)
155 FATAL("out of space in makesymtab");
162 void freesymtab(Cell *ap) /* free a symbol table */
170 tp = (Array *) ap->sval;
173 for (i = 0; i < tp->size; i++) {
174 for (cp = tp->tab[i]; cp != nil; cp = temp) {
178 temp = cp->cnext; /* avoids freeing then using */
187 void freeelem(Cell *ap, char *s) /* free elem s from ap (i.e., ap["s"] */
190 Cell *p, *prev = nil;
193 tp = (Array *) ap->sval;
194 h = hash(s, tp->size);
195 for (p = tp->tab[h]; p != nil; prev = p, p = p->cnext)
196 if (strcmp(s, p->nval) == 0) {
197 if (prev == nil) /* 1st one */
198 tp->tab[h] = p->cnext;
199 else /* middle somewhere */
200 prev->cnext = p->cnext;
210 Cell *setsymtab(char *n, char *s, Awkfloat f, unsigned t, Array *tp)
215 if (n != nil && (p = lookup(n, tp)) != nil) {
216 dprint( ("setsymtab found %p: n=%s s=\"%s\" f=%g t=%o\n",
217 p, p->nval, p->sval, p->fval, p->tval) );
220 p = (Cell *) malloc(sizeof(Cell));
222 FATAL("out of space for symbol table at %s", n);
223 p->nval = tostring(n);
225 if(tp == symtab && strcmp(n, "ENVIRON") == 0 && !safe) {
227 p->sval = (char *) ENVtab;
230 p->sval = s ? tostring(s) : tostring("");
236 if (tp->nelemt > FULLTAB * tp->size)
238 h = hash(n, tp->size);
239 p->cnext = tp->tab[h];
241 dprint( ("setsymtab set %p: n=%s s=\"%s\" f=%g t=%o\n",
242 p, p->nval, p->sval, p->fval, p->tval) );
246 int hash(char *s, int n) /* form hash value for string s */
250 for (hashval = 0; *s != '\0'; s++)
251 hashval = (*s + 31 * hashval);
255 void rehash(Array *tp) /* rehash items in small table into big one */
260 nsz = GROWTAB * tp->size;
261 np = (Cell **) calloc(nsz, sizeof(Cell *));
262 if (np == nil) /* can't do it, but can keep running. */
263 return; /* someone else will run out later. */
264 for (i = 0; i < tp->size; i++) {
265 for (cp = tp->tab[i]; cp; cp = op) {
267 nh = hash(cp->nval, nsz);
277 Cell *lookup(char *s, Array *tp) /* look for s in tp */
282 h = hash(s, tp->size);
283 for (p = tp->tab[h]; p != nil; p = p->cnext)
284 if (strcmp(s, p->nval) == 0)
285 return(p); /* found it */
286 return(nil); /* not found */
289 Awkfloat setfval(Cell *vp, Awkfloat f) /* set float val of a Cell */
293 if ((vp->tval & (NUM | STR)) == 0)
294 funnyvar(vp, "assign to");
296 donerec = 0; /* mark $0 invalid */
297 fldno = atoi(vp->nval);
300 dprint( ("setting field %d to %g\n", fldno, f) );
301 } else if (isrec(vp)) {
302 donefld = 0; /* mark $1... invalid */
306 xfree(vp->sval); /* free any previous string */
307 vp->tval &= ~STR; /* mark string invalid */
308 vp->tval |= NUM; /* mark number ok */
309 dprint( ("setfval %p: %s = %g, t=%o\n", vp, vp->nval, f, vp->tval) );
313 void funnyvar(Cell *vp, char *rw)
316 FATAL("can't %s %s; it's an array name.", rw, vp->nval);
318 FATAL("can't %s %s; it's a function.", rw, vp->nval);
319 WARNING("funny variable %p: n=%s s=\"%s\" f=%g t=%o",
320 vp, vp->nval, vp->sval, vp->fval, vp->tval);
323 char *setsval(Cell *vp, char *s) /* set string val of a Cell */
328 dprint( ("starting setsval %p: %s = \"%s\", t=%o\n", vp, vp->nval, s, vp->tval) );
329 if ((vp->tval & (NUM | STR)) == 0)
330 funnyvar(vp, "assign to");
332 donerec = 0; /* mark $0 invalid */
333 fldno = atoi(vp->nval);
336 dprint( ("setting field %d to %s (%p)\n", fldno, s, s) );
337 } else if (isrec(vp)) {
338 donefld = 0; /* mark $1... invalid */
341 t = tostring(s); /* in case it's self-assign */
346 vp->tval &= ~DONTFREE;
347 dprint( ("setsval %p: %s = \"%s (%p)\", t=%o\n", vp, vp->nval, t,t, vp->tval) );
348 return(vp->sval = t);
351 Awkfloat getfval(Cell *vp) /* get float val of a Cell */
353 if ((vp->tval & (NUM | STR)) == 0)
354 funnyvar(vp, "read value of");
355 if (isfld(vp) && donefld == 0)
357 else if (isrec(vp) && donerec == 0)
359 if (!isnum(vp)) { /* not a number */
360 vp->fval = atof(vp->sval); /* best guess */
361 if (is_number(vp->sval) && !(vp->tval&CON))
362 vp->tval |= NUM; /* make NUM only sparingly */
364 dprint( ("getfval %p: %s = %g, t=%o\n", vp, vp->nval, vp->fval, vp->tval) );
368 char *getsval(Cell *vp) /* get string val of a Cell */
370 char s[100]; /* BUG: unchecked */
373 if ((vp->tval & (NUM | STR)) == 0)
374 funnyvar(vp, "read value of");
375 if (isfld(vp) && donefld == 0)
377 else if (isrec(vp) && donerec == 0)
379 if (isstr(vp) == 0) {
382 if (modf(vp->fval, &dtemp) == 0) /* it's integral */
383 sprint(s, "%.30g", vp->fval);
385 sprint(s, *CONVFMT, vp->fval);
386 vp->sval = tostring(s);
387 vp->tval &= ~DONTFREE;
390 dprint( ("getsval %p: %s = \"%s (%p)\", t=%o\n", vp, vp->nval, vp->sval, vp->sval, vp->tval) );
394 char *tostring(char *s) /* make a copy of string s */
398 p = (char *) malloc(strlen(s)+1);
400 FATAL("out of space in tostring on %s", s);
405 char *qstring(char *s, int delim) /* collect string up to next delim */
411 if ((buf = (char *) malloc(strlen(s)+3)) == nil)
412 FATAL( "out of space in qstring(%s)", s);
413 for (bp = buf; (c = *s) != delim; s++) {
415 SYNTAX( "newline in string %.20s...", os );
418 else { /* \something */
420 if (c == 0) { /* \ at end */
422 break; /* for loop */
425 case '\\': *bp++ = '\\'; break;
426 case 'n': *bp++ = '\n'; break;
427 case 't': *bp++ = '\t'; break;
428 case 'b': *bp++ = '\b'; break;
429 case 'f': *bp++ = '\f'; break;
430 case 'r': *bp++ = '\r'; break;
438 n = 8 * n + *++s - '0';
440 n = 8 * n + *++s - '0';