#pragma ident "%Z%%M% %I% %E% SMI"

#define tempfree(x, s) if (istemp(x)) tfree(x, s)

#define execute(p) r_execute(p)

#define DEBUG

#include "awk.h"

#include <math.h>

#include "y.tab.h"

#include <stdio.h>

#include <ctype.h>

#include <setjmp.h>

#include <time.h>

#ifndef FOPEN_MAX

#define FOPEN_MAX 15 /* max number of open files, from ANSI std. */

#endif

static jmp_buf env;

static Cell *r_execute(Node *);

static Cell *gettemp(char *), *copycell(Cell *);

static FILE *openfile(int, uchar *), *redirect(int, Node *);

int paircnt;

Node *winner = NULL;

static Cell *tmps;

static Cell truecell = { OBOOL, BTRUE, 0, 0, 1.0, NUM };

Cell *true = &truecell;

static Cell falsecell = { OBOOL, BFALSE, 0, 0, 0.0, NUM };

Cell *false = &falsecell;

static Cell breakcell = { OJUMP, JBREAK, 0, 0, 0.0, NUM };

Cell *jbreak = &breakcell;

static Cell contcell = { OJUMP, JCONT, 0, 0, 0.0, NUM };

Cell *jcont = &contcell;

static Cell nextcell = { OJUMP, JNEXT, 0, 0, 0.0, NUM };

Cell *jnext = &nextcell;

static Cell exitcell = { OJUMP, JEXIT, 0, 0, 0.0, NUM };

Cell *jexit = &exitcell;

static Cell retcell = { OJUMP, JRET, 0, 0, 0.0, NUM };

Cell *jret = &retcell;

static Cell tempcell = { OCELL, CTEMP, 0, 0, 0.0, NUM };

Node *curnode = NULL; /* the node being executed, for debugging */

static void tfree(Cell *, char *);

static void closeall(void);

static double ipow(double, int);

run(Node *a)

{

(void) execute(a);

closeall();

}

static Cell *

r_execute(Node *u)

{

register Cell *(*proc)();

register Cell *x;

register Node *a;

if (u == NULL)

return (true);

for (a = u; ; a = a->nnext) {

curnode = a;

if (isvalue(a)) {

x = (Cell *) (a->narg[0]);

if ((x->tval & FLD) && !donefld)

fldbld();

else if ((x->tval & REC) && !donerec)

recbld();

return (x);

}

/* probably a Cell* but too risky to print */

if (notlegal(a->nobj))

ERROR "illegal statement" FATAL;

proc = proctab[a->nobj-FIRSTTOKEN];

x = (*proc)(a->narg, a->nobj);

if ((x->tval & FLD) && !donefld)

fldbld();

else if ((x->tval & REC) && !donerec)

recbld();

if (isexpr(a))

return (x);

/* a statement, goto next statement */

if (isjump(x))

return (x);

if (a->nnext == (Node *)NULL)

return (x);

tempfree(x, "execute");

}

}

Cell *

program(Node **a, int n)

{

register Cell *x;

if (setjmp(env) != 0)

goto ex;

if (a[0]) { /* BEGIN */

x = execute(a[0]);

if (isexit(x))

return (true);

if (isjump(x)) {

ERROR "illegal break, continue or next from BEGIN"

FATAL;

}

tempfree(x, "");

}

loop:

if (a[1] || a[2])

while (getrec(&record, &record_size) > 0) {

x = execute(a[1]);

if (isexit(x))

break;

tempfree(x, "");

}

ex:

if (setjmp(env) != 0)

goto ex1;

if (a[2]) { /* END */

x = execute(a[2]);

if (iscont(x)) /* read some more */

goto loop;

if (isbreak(x) || isnext(x))

ERROR "illegal break or next from END" FATAL;

tempfree(x, "");

}

ex1:

return (true);

}

struct Frame {

int nargs; /* number of arguments in this call */

Cell *fcncell; /* pointer to Cell for function */

Cell **args; /* pointer to array of arguments after execute */

Cell *retval; /* return value */

};

#define NARGS 30

struct Frame *frame = NULL; /* base of stack frames; dynamically allocated */

int nframe = 0; /* number of frames allocated */

struct Frame *fp = NULL; /* frame pointer. bottom level unused */

Cell *

call(Node **a, int n)

{

static Cell newcopycell =

{ OCELL, CCOPY, 0, (uchar *) "", 0.0, NUM|STR|DONTFREE };

int i, ncall, ndef, freed = 0;

Node *x;

Cell *args[NARGS], *oargs[NARGS], *y, *z, *fcn;

uchar *s;

fcn = execute(a[0]); /* the function itself */

s = fcn->nval;

if (!isfunc(fcn))

ERROR "calling undefined function %s", s FATAL;

if (frame == NULL) {

fp = frame = (struct Frame *)calloc(nframe += 100,

sizeof (struct Frame));

if (frame == NULL) {

ERROR "out of space for stack frames calling %s",

s FATAL;

}

}

for (ncall = 0, x = a[1]; x != NULL; x = x->nnext) /* args in call */

ncall++;

ndef = (int)fcn->fval; /* args in defn */

dprintf(("calling %s, %d args (%d in defn), fp=%d\n",

s, ncall, ndef, fp-frame));

if (ncall > ndef) {

ERROR "function %s called with %d args, uses only %d",

s, ncall, ndef WARNING;

}

if (ncall + ndef > NARGS) {

ERROR "function %s has %d arguments, limit %d",

s, ncall+ndef, NARGS FATAL;

}

for (i = 0, x = a[1]; x != NULL; i++, x = x->nnext) {

/* get call args */

dprintf(("evaluate args[%d], fp=%d:\n", i, fp-frame));

y = execute(x);

oargs[i] = y;

dprintf(("args[%d]: %s %f <%s>, t=%o\n",

i, y->nval, y->fval,

isarr(y) ? "(array)" : (char *)y->sval, y->tval));

if (isfunc(y)) {

ERROR "can't use function %s as argument in %s",

y->nval, s FATAL;

}

if (isarr(y))

args[i] = y; /* arrays by ref */

else

args[i] = copycell(y);

tempfree(y, "callargs");

}

for (; i < ndef; i++) { /* add null args for ones not provided */

args[i] = gettemp("nullargs");

*args[i] = newcopycell;

}

fp++; /* now ok to up frame */

if (fp >= frame + nframe) {

int dfp = fp - frame; /* old index */

frame = (struct Frame *)

realloc(frame, (nframe += 100) * sizeof (struct Frame));

if (frame == NULL)

ERROR "out of space for stack frames in %s", s FATAL;

fp = frame + dfp;

}

fp->fcncell = fcn;

fp->args = args;

fp->nargs = ndef; /* number defined with (excess are locals) */

fp->retval = gettemp("retval");

dprintf(("start exec of %s, fp=%d\n", s, fp-frame));

/*LINTED align*/

y = execute((Node *)(fcn->sval)); /* execute body */

dprintf(("finished exec of %s, fp=%d\n", s, fp-frame));

for (i = 0; i < ndef; i++) {

Cell *t = fp->args[i];

if (isarr(t)) {

if (t->csub == CCOPY) {

if (i >= ncall) {

freesymtab(t);

t->csub = CTEMP;

} else {

oargs[i]->tval = t->tval;

oargs[i]->tval &= ~(STR|NUM|DONTFREE);

oargs[i]->sval = t->sval;

tempfree(t, "oargsarr");

}

}

} else {

t->csub = CTEMP;

tempfree(t, "fp->args");

if (t == y) freed = 1;

}

}

tempfree(fcn, "call.fcn");

if (isexit(y) || isnext(y))

return (y);

if (!freed)

tempfree(y, "fcn ret"); /* this can free twice! */

z = fp->retval; /* return value */

dprintf(("%s returns %g |%s| %o\n",

s, getfval(z), getsval(z), z->tval));

fp--;

return (z);

}

static Cell *

copycell(Cell *x) /* make a copy of a cell in a temp */

{

Cell *y;

y = gettemp("copycell");

y->csub = CCOPY; /* prevents freeing until call is over */

y->nval = x->nval;

y->sval = x->sval ? tostring(x->sval) : NULL;

y->fval = x->fval;

/* copy is not constant or field is DONTFREE right? */

y->tval = x->tval & ~(CON|FLD|REC|DONTFREE);

return (y);

}

Cell *

arg(Node **a, int nnn)

{

int n;

n = (int)a[0]; /* argument number, counting from 0 */

dprintf(("arg(%d), fp->nargs=%d\n", n, fp->nargs));

if (n+1 > fp->nargs) {

ERROR "argument #%d of function %s was not supplied",

n+1, fp->fcncell->nval FATAL;

}

return (fp->args[n]);

}

Cell *

jump(Node **a, int n)

{

register Cell *y;

switch (n) {

case EXIT:

if (a[0] != NULL) {

y = execute(a[0]);

errorflag = getfval(y);

tempfree(y, "");

}

longjmp(env, 1);

/*NOTREACHED*/

case RETURN:

if (a[0] != NULL) {

y = execute(a[0]);

if ((y->tval & (STR|NUM)) == (STR|NUM)) {

(void) setsval(fp->retval, getsval(y));

fp->retval->fval = getfval(y);

fp->retval->tval |= NUM;

} else if (y->tval & STR)

(void) setsval(fp->retval, getsval(y));

else if (y->tval & NUM)

(void) setfval(fp->retval, getfval(y));

tempfree(y, "");

}

return (jret);

case NEXT:

return (jnext);

case BREAK:

return (jbreak);

case CONTINUE:

return (jcont);

default: /* can't happen */

ERROR "illegal jump type %d", n FATAL;

}

/*NOTREACHED*/

return (NULL);

}

Cell *

getline(Node **a, int n)

{

/* a[0] is variable, a[1] is operator, a[2] is filename */

register Cell *r, *x;

uchar *buf;

FILE *fp;

size_t len;

(void) fflush(stdout); /* in case someone is waiting for a prompt */

r = gettemp("");

if (a[1] != NULL) { /* getline < file */

x = execute(a[2]); /* filename */

if ((int)a[1] == '|') /* input pipe */

a[1] = (Node *)LE; /* arbitrary flag */

fp = openfile((int)a[1], getsval(x));

tempfree(x, "");

buf = NULL;

if (fp == NULL)

n = -1;

else

n = readrec(&buf, &len, fp);

if (n > 0) {

if (a[0] != NULL) { /* getline var <file */

(void) setsval(execute(a[0]), buf);

} else { /* getline <file */

if (!(recloc->tval & DONTFREE))

xfree(recloc->sval);

expand_buf(&record, &record_size, len);

(void) memcpy(record, buf, len);

record[len] = '\0';

recloc->sval = record;

recloc->tval = REC | STR | DONTFREE;

donerec = 1; donefld = 0;

}

}

if (buf != NULL)

free(buf);

} else { /* bare getline; use current input */

if (a[0] == NULL) /* getline */

n = getrec(&record, &record_size);

else { /* getline var */

init_buf(&buf, &len, LINE_INCR);

n = getrec(&buf, &len);

(void) setsval(execute(a[0]), buf);

free(buf);

}

}

(void) setfval(r, (Awkfloat)n);

return (r);

}

Cell *

getnf(Node **a, int n)

{

if (donefld == 0)

fldbld();

return ((Cell *)a[0]);

}

Cell *

array(Node **a, int n)

{

register Cell *x, *y, *z;

register uchar *s;

register Node *np;

uchar *buf;

size_t bsize, tlen, len, slen;

x = execute(a[0]); /* Cell* for symbol table */

init_buf(&buf, &bsize, LINE_INCR);

buf[0] = '\0';

tlen = 0;

slen = strlen((char *)*SUBSEP);

for (np = a[1]; np; np = np->nnext) {

y = execute(np); /* subscript */

s = getsval(y);

len = strlen((char *)s);

expand_buf(&buf, &bsize, tlen + len + slen);

(void) memcpy(&buf[tlen], s, len);

tlen += len;

if (np->nnext) {

(void) memcpy(&buf[tlen], *SUBSEP, slen);

tlen += slen;

}

buf[tlen] = '\0';

tempfree(y, "");

}

if (!isarr(x)) {

dprintf(("making %s into an array\n", x->nval));

if (freeable(x))

xfree(x->sval);

x->tval &= ~(STR|NUM|DONTFREE);

x->tval |= ARR;

x->sval = (uchar *) makesymtab(NSYMTAB);

}

/*LINTED align*/

z = setsymtab(buf, (uchar *)"", 0.0, STR|NUM, (Array *)x->sval);

z->ctype = OCELL;

z->csub = CVAR;

tempfree(x, "");

free(buf);

return (z);

}

Cell *

delete(Node **a, int n)

{

Cell *x, *y;

Node *np;

uchar *buf, *s;

size_t bsize, tlen, slen, len;

x = execute(a[0]); /* Cell* for symbol table */

if (!isarr(x))

return (true);

init_buf(&buf, &bsize, LINE_INCR);

buf[0] = '\0';

tlen = 0;

slen = strlen((char *)*SUBSEP);

for (np = a[1]; np; np = np->nnext) {

y = execute(np); /* subscript */

s = getsval(y);

len = strlen((char *)s);

expand_buf(&buf, &bsize, tlen + len + slen);

(void) memcpy(&buf[tlen], s, len);

tlen += len;

if (np->nnext) {

(void) memcpy(&buf[tlen], *SUBSEP, slen);

tlen += slen;

}

buf[tlen] = '\0';

tempfree(y, "");

}

freeelem(x, buf);

tempfree(x, "");

free(buf);

return (true);

}

Cell *

intest(Node **a, int n)

{

register Cell *x, *ap, *k;

Node *p;

uchar *buf;

uchar *s;

size_t bsize, tlen, slen, len;

ap = execute(a[1]); /* array name */

if (!isarr(ap))

ERROR "%s is not an array", ap->nval FATAL;

init_buf(&buf, &bsize, LINE_INCR);

buf[0] = 0;

tlen = 0;

slen = strlen((char *)*SUBSEP);

for (p = a[0]; p; p = p->nnext) {

x = execute(p); /* expr */

s = getsval(x);

len = strlen((char *)s);

expand_buf(&buf, &bsize, tlen + len + slen);

(void) memcpy(&buf[tlen], s, len);

tlen += len;

tempfree(x, "");

if (p->nnext) {

(void) memcpy(&buf[tlen], *SUBSEP, slen);

tlen += slen;

}

buf[tlen] = '\0';

}

/*LINTED align*/

k = lookup(buf, (Array *)ap->sval);

tempfree(ap, "");

free(buf);

if (k == NULL)

return (false);

else

return (true);

}

Cell *

matchop(Node **a, int n)

{

register Cell *x, *y;

register uchar *s, *t;

register int i;

fa *pfa;

int (*mf)() = match, mode = 0;

if (n == MATCHFCN) {

mf = pmatch;

mode = 1;

}

x = execute(a[1]);

s = getsval(x);

if (a[0] == 0)

i = (*mf)(a[2], s);

else {

y = execute(a[2]);

t = getsval(y);

pfa = makedfa(t, mode);

i = (*mf)(pfa, s);

tempfree(y, "");

}

tempfree(x, "");

if (n == MATCHFCN) {

int start = patbeg - s + 1;

if (patlen < 0)

start = 0;

(void) setfval(rstartloc, (Awkfloat)start);

(void) setfval(rlengthloc, (Awkfloat)patlen);

x = gettemp("");

x->tval = NUM;

x->fval = start;

return (x);

} else if (n == MATCH && i == 1 || n == NOTMATCH && i == 0)

return (true);

else

return (false);

}

Cell *

boolop(Node **a, int n)

{

register Cell *x, *y;

register int i;

x = execute(a[0]);

i = istrue(x);

tempfree(x, "");

switch (n) {

case BOR:

if (i)

return (true);

y = execute(a[1]);

i = istrue(y);

tempfree(y, "");

return (i ? true : false);

case AND:

if (!i)

return (false);

y = execute(a[1]);

i = istrue(y);

tempfree(y, "");

return (i ? true : false);

case NOT:

return (i ? false : true);

default: /* can't happen */

ERROR "unknown boolean operator %d", n FATAL;

}

/*NOTREACHED*/

return (NULL);

}

Cell *

relop(Node **a, int n)

{

register int i;

register Cell *x, *y;

Awkfloat j;

x = execute(a[0]);

y = execute(a[1]);

if (x->tval&NUM && y->tval&NUM) {

j = x->fval - y->fval;

i = j < 0 ? -1: (j > 0 ? 1: 0);

} else {

i = strcmp((char *)getsval(x), (char *)getsval(y));

}

tempfree(x, "");

tempfree(y, "");

switch (n) {

case LT: return (i < 0 ? true : false);

case LE: return (i <= 0 ? true : false);

case NE: return (i != 0 ? true : false);

case EQ: return (i == 0 ? true : false);

case GE: return (i >= 0 ? true : false);

case GT: return (i > 0 ? true : false);

default: /* can't happen */

ERROR "unknown relational operator %d", n FATAL;

}

/*NOTREACHED*/

return (false);

}

static void

tfree(Cell *a, char *s)

{

if (dbg > 1) {

(void) printf("## tfree %.8s %06lo %s\n",

s, (ulong_t)a, a->sval ? a->sval : (uchar *)"");

}

if (freeable(a))

xfree(a->sval);

if (a == tmps)

ERROR "tempcell list is curdled" FATAL;

a->cnext = tmps;

tmps = a;

}

static Cell *

gettemp(char *s)

{

int i;

register Cell *x;

if (!tmps) {

tmps = (Cell *)calloc(100, sizeof (Cell));

if (!tmps)

ERROR "no space for temporaries" FATAL;

for (i = 1; i < 100; i++)

tmps[i-1].cnext = &tmps[i];

tmps[i-1].cnext = 0;

}

x = tmps;

tmps = x->cnext;

*x = tempcell;

if (dbg > 1)

(void) printf("## gtemp %.8s %06lo\n", s, (ulong_t)x);

return (x);

}

Cell *

indirect(Node **a, int n)

{

register Cell *x;

register int m;

register uchar *s;

x = execute(a[0]);

m = getfval(x);

if (m == 0 && !is_number(s = getsval(x))) /* suspicion! */

ERROR "illegal field $(%s)", s FATAL;

tempfree(x, "");

x = fieldadr(m);

x->ctype = OCELL;

x->csub = CFLD;

return (x);

}

Cell *

substr(Node **a, int nnn)

{

register int k, m, n;

register uchar *s;

int temp;

register Cell *x, *y, *z;

x = execute(a[0]);

y = execute(a[1]);

if (a[2] != 0)

z = execute(a[2]);

s = getsval(x);

k = strlen((char *)s) + 1;

if (k <= 1) {

tempfree(x, "");

tempfree(y, "");

if (a[2] != 0)

tempfree(z, "");

x = gettemp("");

(void) setsval(x, (uchar *)"");

return (x);

}

m = getfval(y);

if (m <= 0)

m = 1;

else if (m > k)

m = k;

tempfree(y, "");

if (a[2] != 0) {

n = getfval(z);

tempfree(z, "");

} else

n = k - 1;

if (n < 0)

n = 0;

else if (n > k - m)

n = k - m;

dprintf(("substr: m=%d, n=%d, s=%s\n", m, n, s));

y = gettemp("");

temp = s[n + m - 1]; /* with thanks to John Linderman */

s[n + m - 1] = '\0';

(void) setsval(y, s + m - 1);

s[n + m - 1] = temp;

tempfree(x, "");

return (y);

}

Cell *

sindex(Node **a, int nnn)

{

register Cell *x, *y, *z;

register uchar *s1, *s2, *p1, *p2, *q;

Awkfloat v = 0.0;

x = execute(a[0]);

s1 = getsval(x);

y = execute(a[1]);

s2 = getsval(y);

z = gettemp("");

for (p1 = s1; *p1 != '\0'; p1++) {

for (q = p1, p2 = s2; *p2 != '\0' && *q == *p2; q++, p2++)

;

if (*p2 == '\0') {

v = (Awkfloat) (p1 - s1 + 1); /* origin 1 */

break;

}

}

tempfree(x, "");

tempfree(y, "");

(void) setfval(z, v);

return (z);

}

format(uchar **bufp, uchar *s, Node *a)

{

uchar *fmt;

register uchar *os;

register Cell *x;

int flag = 0, len;

uchar_t *buf;

size_t bufsize, fmtsize, cnt, tcnt, ret;

init_buf(&buf, &bufsize, LINE_INCR);

init_buf(&fmt, &fmtsize, LINE_INCR);

os = s;

cnt = 0;

while (*s) {

if (*s != '%') {

expand_buf(&buf, &bufsize, cnt);

buf[cnt++] = *s++;

continue;

}

if (*(s+1) == '%') {

expand_buf(&buf, &bufsize, cnt);

buf[cnt++] = '%';

s += 2;

continue;

}

for (tcnt = 0; ; s++) {

expand_buf(&fmt, &fmtsize, tcnt);

fmt[tcnt++] = *s;

if (*s == '\0')

break;

if (isalpha(*s) && *s != 'l' && *s != 'h' && *s != 'L')

break; /* the ansi panoply */

if (*s == '*') {

if (a == NULL) {

ERROR

"not enough args in printf(%s) or sprintf(%s)", os, os FATAL;

}

x = execute(a);

a = a->nnext;

tcnt--;

expand_buf(&fmt, &fmtsize, tcnt + 12);

ret = sprintf((char *)&fmt[tcnt], "%d",

(int)getfval(x));

tcnt += ret;

tempfree(x, "");

}

}

fmt[tcnt] = '\0';

switch (*s) {

case 'f': case 'e': case 'g': case 'E': case 'G':

flag = 1;

break;

case 'd': case 'i':

flag = 2;

if (*(s-1) == 'l')

break;

fmt[tcnt - 1] = 'l';

expand_buf(&fmt, &fmtsize, tcnt);

fmt[tcnt++] = 'd';

fmt[tcnt] = '\0';

break;

case 'o': case 'x': case 'X': case 'u':

flag = *(s-1) == 'l' ? 2 : 3;

break;

case 's':

flag = 4;

break;

case 'c':

flag = 5;

break;

default:

flag = 0;

break;

}

if (flag == 0) {

len = strlen((char *)fmt);

expand_buf(&buf, &bufsize, cnt + len);

(void) memcpy(&buf[cnt], fmt, len);

cnt += len;

buf[cnt] = '\0';

continue;

}

if (a == NULL) {

ERROR

"not enough args in printf(%s) or sprintf(%s)", os, os FATAL;

}

x = execute(a);

a = a->nnext;

for (;;) {

/* make sure we have at least 1 byte space */

expand_buf(&buf, &bufsize, cnt + 1);

len = bufsize - cnt;

switch (flag) {

case 1:

/*LINTED*/

ret = snprintf((char *)&buf[cnt], len,

(char *)fmt, getfval(x));

break;

case 2:

/*LINTED*/

ret = snprintf((char *)&buf[cnt], len,

(char *)fmt, (long)getfval(x));

break;

case 3:

/*LINTED*/

ret = snprintf((char *)&buf[cnt], len,

(char *)fmt, (int)getfval(x));

break;

case 4:

/*LINTED*/

ret = snprintf((char *)&buf[cnt], len,

(char *)fmt, getsval(x));

break;

case 5:

if (isnum(x)) {

/*LINTED*/

ret = snprintf((char *)&buf[cnt], len,

(char *)fmt, (int)getfval(x));

} else {

/*LINTED*/

ret = snprintf((char *)&buf[cnt], len,

(char *)fmt, getsval(x)[0]);

}

break;

default:

ret = 0;

}

if (ret < len)

break;

expand_buf(&buf, &bufsize, cnt + ret);

}

tempfree(x, "");

cnt += ret;

s++;

}

buf[cnt] = '\0';

for (; a; a = a->nnext) /* evaluate any remaining args */

(void) execute(a);

*bufp = tostring(buf);

free(buf);

free(fmt);

}

Cell *

asprintf(Node **a, int n)

{

register Cell *x;

register Node *y;

uchar *buf;

y = a[0]->nnext;

x = execute(a[0]);

format(&buf, getsval(x), y);

tempfree(x, "");

x = gettemp("");

x->sval = buf;

x->tval = STR;

return (x);

}

Cell *

aprintf(Node **a, int n)

{

FILE *fp;

register Cell *x;

register Node *y;

uchar *buf;

y = a[0]->nnext;

x = execute(a[0]);

format(&buf, getsval(x), y);

tempfree(x, "");

if (a[1] == NULL)

(void) fputs((char *)buf, stdout);

else {

fp = redirect((int)a[1], a[2]);

(void) fputs((char *)buf, fp);

(void) fflush(fp);

}

free(buf);

return (true);

}

Cell *

arith(Node **a, int n)

{

Awkfloat i, j;

double v;

register Cell *x, *y, *z;

x = execute(a[0]);

i = getfval(x);

tempfree(x, "");

if (n != UMINUS) {

y = execute(a[1]);

j = getfval(y);

tempfree(y, "");

}

z = gettemp("");

switch (n) {

case ADD:

i += j;

break;

case MINUS:

i -= j;

break;

case MULT:

i *= j;

break;

case DIVIDE:

if (j == 0)

ERROR "division by zero" FATAL;

i /= j;

break;

case MOD:

if (j == 0)

ERROR "division by zero in mod" FATAL;

(void) modf(i/j, &v);

i = i - j * v;

break;

case UMINUS:

i = -i;

break;

case POWER:

if (j >= 0 && modf(j, &v) == 0.0) /* pos integer exponent */

i = ipow(i, (int)j);

else

i = errcheck(pow(i, j), "pow");

break;

default: /* can't happen */

ERROR "illegal arithmetic operator %d", n FATAL;

}

(void) setfval(z, i);

return (z);

}

static double

ipow(double x, int n)

{

double v;

if (n <= 0)

return (1.0);

v = ipow(x, n/2);

if (n % 2 == 0)

return (v * v);

else

return (x * v * v);

}

Cell *

incrdecr(Node **a, int n)

{

register Cell *x, *z;

register int k;

Awkfloat xf;

x = execute(a[0]);

xf = getfval(x);

k = (n == PREINCR || n == POSTINCR) ? 1 : -1;

if (n == PREINCR || n == PREDECR) {

(void) setfval(x, xf + k);

return (x);

}

z = gettemp("");

(void) setfval(z, xf);

(void) setfval(x, xf + k);

tempfree(x, "");

return (z);

}

Cell *

assign(Node **a, int n)

{

register Cell *x, *y;

Awkfloat xf, yf;

double v;

y = execute(a[1]);

x = execute(a[0]); /* order reversed from before... */

if (n == ASSIGN) { /* ordinary assignment */

if ((y->tval & (STR|NUM)) == (STR|NUM)) {

(void) setsval(x, getsval(y));

x->fval = getfval(y);

x->tval |= NUM;

} else if (y->tval & STR)

(void) setsval(x, getsval(y));

else if (y->tval & NUM)

(void) setfval(x, getfval(y));

else

funnyvar(y, "read value of");

tempfree(y, "");

return (x);

}

xf = getfval(x);

yf = getfval(y);

switch (n) {

case ADDEQ:

xf += yf;

break;

case SUBEQ:

xf -= yf;

break;

case MULTEQ:

xf *= yf;

break;

case DIVEQ:

if (yf == 0)

ERROR "division by zero in /=" FATAL;

xf /= yf;

break;

case MODEQ:

if (yf == 0)

ERROR "division by zero in %%=" FATAL;

(void) modf(xf/yf, &v);

xf = xf - yf * v;

break;

case POWEQ:

if (yf >= 0 && modf(yf, &v) == 0.0) /* pos integer exponent */

xf = ipow(xf, (int)yf);

else

xf = errcheck(pow(xf, yf), "pow");

break;

default:

ERROR "illegal assignment operator %d", n FATAL;

break;

}

tempfree(y, "");

(void) setfval(x, xf);

return (x);

}

Cell *

cat(Node **a, int q)

{

register Cell *x, *y, *z;

register int n1, n2;

register uchar *s;

x = execute(a[0]);

y = execute(a[1]);

(void) getsval(x);

(void) getsval(y);

n1 = strlen((char *)x->sval);

n2 = strlen((char *)y->sval);

s = (uchar *)malloc(n1 + n2 + 1);

if (s == NULL) {

ERROR "out of space concatenating %.15s and %.15s",

x->sval, y->sval FATAL;

}

(void) strcpy((char *)s, (char *)x->sval);

(void) strcpy((char *)s + n1, (char *)y->sval);

tempfree(y, "");

z = gettemp("");

z->sval = s;

z->tval = STR;

tempfree(x, "");

return (z);

}

Cell *

pastat(Node **a, int n)

{

register Cell *x;

if (a[0] == 0)

x = execute(a[1]);

else {

x = execute(a[0]);

if (istrue(x)) {

tempfree(x, "");

x = execute(a[1]);

}

}

return (x);

}

Cell *

dopa2(Node **a, int n)

{

Cell *x;

int pair;

static int *pairstack = NULL;

if (!pairstack) {

/* first time */

dprintf(("paircnt: %d\n", paircnt));

pairstack = (int *)malloc(sizeof (int) * paircnt);

if (!pairstack)

ERROR "out of space in dopa2" FATAL;

(void) memset(pairstack, 0, sizeof (int) * paircnt);

}

pair = (int)a[3];

if (pairstack[pair] == 0) {

x = execute(a[0]);

if (istrue(x))

pairstack[pair] = 1;

tempfree(x, "");

}

if (pairstack[pair] == 1) {

x = execute(a[1]);

if (istrue(x))

pairstack[pair] = 0;

tempfree(x, "");

x = execute(a[2]);

return (x);

}

return (false);

}

Cell *

split(Node **a, int nnn)

{

Cell *x, *y, *ap;

register uchar *s;

register int sep;

uchar *t, temp, num[11], *fs;

int n, tempstat;

y = execute(a[0]); /* source string */

s = getsval(y);

if (a[2] == 0) /* fs string */

fs = *FS;

else if ((int)a[3] == STRING) { /* split(str,arr,"string") */

x = execute(a[2]);

fs = getsval(x);

} else if ((int)a[3] == REGEXPR)

fs = (uchar *)"(regexpr)"; /* split(str,arr,/regexpr/) */

else

ERROR "illegal type of split()" FATAL;

sep = *fs;

ap = execute(a[1]); /* array name */

freesymtab(ap);

dprintf(("split: s=|%s|, a=%s, sep=|%s|\n", s, ap->nval, fs));

ap->tval &= ~STR;

ap->tval |= ARR;

ap->sval = (uchar *)makesymtab(NSYMTAB);

n = 0;

if (*s != '\0' && strlen((char *)fs) > 1 || (int)a[3] == REGEXPR) {

/* reg expr */

fa *pfa;

if ((int)a[3] == REGEXPR) { /* it's ready already */

pfa = (fa *)a[2];

} else {

pfa = makedfa(fs, 1);

}

if (nematch(pfa, s)) {

tempstat = pfa->initstat;

pfa->initstat = 2;

do {

n++;

(void) sprintf((char *)num, "%d", n);

temp = *patbeg;

*patbeg = '\0';

if (is_number(s)) {

(void) setsymtab(num, s,

atof((char *)s),

/*LINTED align*/

STR|NUM, (Array *)ap->sval);

} else {

(void) setsymtab(num, s, 0.0,

/*LINTED align*/

STR, (Array *)ap->sval);

}

*patbeg = temp;

s = patbeg + patlen;

if (*(patbeg+patlen-1) == 0 || *s == 0) {

n++;

(void) sprintf((char *)num, "%d", n);

(void) setsymtab(num, (uchar *)"", 0.0,

/*LINTED align*/

STR, (Array *)ap->sval);

pfa->initstat = tempstat;

goto spdone;

}

} while (nematch(pfa, s));

}

n++;

(void) sprintf((char *)num, "%d", n);

if (is_number(s)) {

(void) setsymtab(num, s, atof((char *)s),

/*LINTED align*/

STR|NUM, (Array *)ap->sval);

} else {

/*LINTED align*/

(void) setsymtab(num, s, 0.0, STR, (Array *)ap->sval);

}

spdone:

pfa = NULL;

} else if (sep == ' ') {

for (n = 0; ; ) {

while (*s == ' ' || *s == '\t' || *s == '\n')

s++;

if (*s == 0)

break;

n++;

t = s;

do

s++;

while (*s != ' ' && *s != '\t' &&

*s != '\n' && *s != '\0')

;

temp = *s;

*s = '\0';

(void) sprintf((char *)num, "%d", n);

if (is_number(t)) {

(void) setsymtab(num, t, atof((char *)t),

/*LINTED align*/

STR|NUM, (Array *)ap->sval);

} else {

(void) setsymtab(num, t, 0.0,

/*LINTED align*/

STR, (Array *)ap->sval);

}

*s = temp;

if (*s != 0)

s++;

}

} else if (*s != 0) {

for (;;) {

n++;

t = s;

while (*s != sep && *s != '\n' && *s != '\0')

s++;

temp = *s;

*s = '\0';

(void) sprintf((char *)num, "%d", n);

if (is_number(t)) {

(void) setsymtab(num, t, atof((char *)t),

/*LINTED align*/

STR|NUM, (Array *)ap->sval);

} else {

(void) setsymtab(num, t, 0.0,

/*LINTED align*/

STR, (Array *)ap->sval);

}

*s = temp;

if (*s++ == 0)

break;

}

}

tempfree(ap, "");

tempfree(y, "");

if (a[2] != 0 && (int)a[3] == STRING)

tempfree(x, "");

x = gettemp("");

x->tval = NUM;

x->fval = n;

return (x);

}

Cell *

condexpr(Node **a, int n)

{

register Cell *x;

x = execute(a[0]);

if (istrue(x)) {

tempfree(x, "");

x = execute(a[1]);

} else {

tempfree(x, "");

x = execute(a[2]);

}

return (x);

}

Cell *

ifstat(Node **a, int n)

{

register Cell *x;

x = execute(a[0]);

if (istrue(x)) {

tempfree(x, "");

x = execute(a[1]);

} else if (a[2] != 0) {

tempfree(x, "");

x = execute(a[2]);

}

return (x);

}

Cell *

whilestat(Node **a, int n)

{

register Cell *x;

for (;;) {

x = execute(a[0]);

if (!istrue(x))

return (x);

tempfree(x, "");

x = execute(a[1]);

if (isbreak(x)) {

x = true;

return (x);

}

if (isnext(x) || isexit(x) || isret(x))

return (x);

tempfree(x, "");

}

}

Cell *

dostat(Node **a, int n)

{

register Cell *x;

for (;;) {

x = execute(a[0]);

if (isbreak(x))

return (true);

if (isnext(x) || isexit(x) || isret(x))

return (x);

tempfree(x, "");

x = execute(a[1]);

if (!istrue(x))

return (x);

tempfree(x, "");

}

}

Cell *

forstat(Node **a, int n)

{

register Cell *x;

x = execute(a[0]);

tempfree(x, "");

for (;;) {

if (a[1] != 0) {

x = execute(a[1]);

if (!istrue(x))

return (x);

else

tempfree(x, "");

}

x = execute(a[3]);

if (isbreak(x)) /* turn off break */

return (true);

if (isnext(x) || isexit(x) || isret(x))

return (x);

tempfree(x, "");

x = execute(a[2]);

tempfree(x, "");

}

}

Cell *

instat(Node **a, int n)

{

register Cell *x, *vp, *arrayp, *cp, *ncp;

Array *tp;

int i;

vp = execute(a[0]);

arrayp = execute(a[1]);

if (!isarr(arrayp))

ERROR "%s is not an array", arrayp->nval FATAL;

/*LINTED align*/

tp = (Array *)arrayp->sval;

tempfree(arrayp, "");

for (i = 0; i < tp->size; i++) { /* this routine knows too much */

for (cp = tp->tab[i]; cp != NULL; cp = ncp) {

(void) setsval(vp, cp->nval);

ncp = cp->cnext;

x = execute(a[2]);

if (isbreak(x)) {

tempfree(vp, "");

return (true);

}

if (isnext(x) || isexit(x) || isret(x)) {

tempfree(vp, "");

return (x);

}

tempfree(x, "");

}

}

return (true);

}

Cell *

bltin(Node **a, int n)

{

register Cell *x, *y;

Awkfloat u;

register int t;

uchar *p, *buf;

Node *nextarg;

t = (int)a[0];

x = execute(a[1]);

nextarg = a[1]->nnext;

switch (t) {

case FLENGTH:

u = (Awkfloat)strlen((char *)getsval(x)); break;

case FLOG:

u = errcheck(log(getfval(x)), "log"); break;

case FINT:

(void) modf(getfval(x), &u); break;

case FEXP:

u = errcheck(exp(getfval(x)), "exp"); break;

case FSQRT:

u = errcheck(sqrt(getfval(x)), "sqrt"); break;

case FSIN:

u = sin(getfval(x)); break;

case FCOS:

u = cos(getfval(x)); break;

case FATAN:

if (nextarg == 0) {

ERROR "atan2 requires two arguments; returning 1.0"

WARNING;

u = 1.0;

} else {

y = execute(a[1]->nnext);

u = atan2(getfval(x), getfval(y));

tempfree(y, "");

nextarg = nextarg->nnext;

}

break;

case FSYSTEM:

/* in case something is buffered already */

(void) fflush(stdout);

/* 256 is unix-dep */

u = (Awkfloat)system((char *)getsval(x)) / 256;

break;

case FRAND:

u = (Awkfloat)(rand() % 32767) / 32767.0;

break;

case FSRAND:

if (x->tval & REC) /* no argument provided */

u = time((time_t *)0);

else

u = getfval(x);

srand((int)u); u = (int)u;

break;

case FTOUPPER:

case FTOLOWER:

buf = tostring(getsval(x));

if (t == FTOUPPER) {

for (p = buf; *p; p++)

if (islower(*p))

*p = toupper(*p);

} else {

for (p = buf; *p; p++)

if (isupper(*p))

*p = tolower(*p);

}

tempfree(x, "");

x = gettemp("");

(void) setsval(x, buf);

free(buf);

return (x);

default: /* can't happen */

ERROR "illegal function type %d", t FATAL;

break;

}

tempfree(x, "");

x = gettemp("");

(void) setfval(x, u);

if (nextarg != 0) {

ERROR "warning: function has too many arguments" WARNING;

for (; nextarg; nextarg = nextarg->nnext)

(void) execute(nextarg);

}

return (x);

}

Cell *

print(Node **a, int n)

{

register Node *x;

register Cell *y;

FILE *fp;

if (a[1] == 0)

fp = stdout;

else

fp = redirect((int)a[1], a[2]);

for (x = a[0]; x != NULL; x = x->nnext) {

y = execute(x);

(void) fputs((char *)getsval(y), fp);

tempfree(y, "");

if (x->nnext == NULL)

(void) fputs((char *)*ORS, fp);

else

(void) fputs((char *)*OFS, fp);

}

if (a[1] != 0)

(void) fflush(fp);

return (true);

}

Cell *

nullproc(Node **a, int n)

{

return (0);

}

struct {

FILE *fp;

uchar *fname;

int mode; /* '|', 'a', 'w' */

} files[FOPEN_MAX];

static FILE *

redirect(int a, Node *b)

{

FILE *fp;

Cell *x;

uchar *fname;

x = execute(b);

fname = getsval(x);

fp = openfile(a, fname);

if (fp == NULL)

ERROR "can't open file %s", fname FATAL;

tempfree(x, "");

return (fp);

}

static FILE *

openfile(int a, uchar *s)

{

register int i, m;

register FILE *fp;

if (*s == '\0')

ERROR "null file name in print or getline" FATAL;

for (i = 0; i < FOPEN_MAX; i++) {

if (files[i].fname &&

strcmp((char *)s, (char *)files[i].fname) == 0) {

if (a == files[i].mode ||

a == APPEND && files[i].mode == GT) {

return (files[i].fp);

}

}

}

for (i = 0; i < FOPEN_MAX; i++) {

if (files[i].fp == 0)

break;

}

if (i >= FOPEN_MAX)

ERROR "%s makes too many open files", s FATAL;

(void) fflush(stdout); /* force a semblance of order */

m = a;

if (a == GT) {

fp = fopen((char *)s, "w");

} else if (a == APPEND) {

fp = fopen((char *)s, "a");

m = GT; /* so can mix > and >> */

} else if (a == '|') { /* output pipe */

fp = popen((char *)s, "w");

} else if (a == LE) { /* input pipe */

fp = popen((char *)s, "r");

} else if (a == LT) { /* getline <file */

fp = strcmp((char *)s, "-") == 0 ?

stdin : fopen((char *)s, "r"); /* "-" is stdin */

} else /* can't happen */

ERROR "illegal redirection" FATAL;

if (fp != NULL) {

files[i].fname = tostring(s);

files[i].fp = fp;

files[i].mode = m;

}

return (fp);

}

Cell *

closefile(Node **a, int n)

{

register Cell *x;

int i, stat;

x = execute(a[0]);

(void) getsval(x);

for (i = 0; i < FOPEN_MAX; i++) {

if (files[i].fname &&

strcmp((char *)x->sval, (char *)files[i].fname) == 0) {

if (ferror(files[i].fp)) {

ERROR "i/o error occurred on %s",

files[i].fname WARNING;

}

if (files[i].mode == '|' || files[i].mode == LE)

stat = pclose(files[i].fp);

else

stat = fclose(files[i].fp);

if (stat == EOF) {

ERROR "i/o error occurred closing %s",

files[i].fname WARNING;

}

xfree(files[i].fname);

/* watch out for ref thru this */

files[i].fname = NULL;

files[i].fp = NULL;

}

}

tempfree(x, "close");

return (true);

}

static void

closeall(void)

{

int i, stat;

for (i = 0; i < FOPEN_MAX; i++) {

if (files[i].fp) {

if (ferror(files[i].fp)) {

ERROR "i/o error occurred on %s",

files[i].fname WARNING;

}

if (files[i].mode == '|' || files[i].mode == LE)

stat = pclose(files[i].fp);

else

stat = fclose(files[i].fp);

if (stat == EOF) {

ERROR "i/o error occurred while closing %s",

files[i].fname WARNING;

}

}

}

}

Cell *

sub(Node **a, int nnn)

{

register uchar *sptr;

register Cell *x, *y, *result;

uchar *buf, *t;

fa *pfa;

size_t bsize, cnt, len;

x = execute(a[3]); /* target string */

t = getsval(x);

if (a[0] == 0)

pfa = (fa *)a[1]; /* regular expression */

else {

y = execute(a[1]);

pfa = makedfa(getsval(y), 1);

tempfree(y, "");

}

y = execute(a[2]); /* replacement string */

result = false;

if (pmatch(pfa, t)) {

init_buf(&buf, &bsize, LINE_INCR);

cnt = 0;

sptr = t;

len = patbeg - sptr;

if (len > 0) {

expand_buf(&buf, &bsize, cnt + len);

(void) memcpy(buf, sptr, len);

cnt += len;

}

sptr = getsval(y);

while (*sptr != 0) {

expand_buf(&buf, &bsize, cnt);

if (*sptr == '\\' && *(sptr+1) == '&') {

sptr++; /* skip \, */

buf[cnt++] = *sptr++; /* add & */

} else if (*sptr == '&') {

expand_buf(&buf, &bsize, cnt + patlen);

sptr++;

(void) memcpy(&buf[cnt], patbeg, patlen);

cnt += patlen;

} else {

buf[cnt++] = *sptr++;

}

}

sptr = patbeg + patlen;

if ((patlen == 0 && *patbeg) || (patlen && *(sptr-1))) {

len = strlen((char *)sptr);

expand_buf(&buf, &bsize, cnt + len);

(void) memcpy(&buf[cnt], sptr, len);

cnt += len;

}

buf[cnt] = '\0';

(void) setsval(x, buf);

free(buf);

result = true;

}

tempfree(x, "");

tempfree(y, "");

return (result);

}

Cell *

gsub(Node **a, int nnn)

{

register Cell *x, *y;

register uchar *rptr, *sptr, *t;

uchar *buf;

register fa *pfa;

int mflag, tempstat, num;

size_t bsize, cnt, len;

mflag = 0; /* if mflag == 0, can replace empty string */

num = 0;

x = execute(a[3]); /* target string */

t = getsval(x);

if (a[0] == 0)

pfa = (fa *) a[1]; /* regular expression */

else {

y = execute(a[1]);

pfa = makedfa(getsval(y), 1);

tempfree(y, "");

}

y = execute(a[2]); /* replacement string */

if (pmatch(pfa, t)) {

tempstat = pfa->initstat;

pfa->initstat = 2;

init_buf(&buf, &bsize, LINE_INCR);

rptr = getsval(y);

cnt = 0;

do {

if (patlen == 0 && *patbeg != 0) {

/* matched empty string */

if (mflag == 0) { /* can replace empty */

num++;

sptr = rptr;

while (*sptr != 0) {

expand_buf(&buf, &bsize, cnt);

if (*sptr == '\\' &&

*(sptr+1) == '&') {

sptr++;

buf[cnt++] = *sptr++;

} else if (*sptr == '&') {

expand_buf(&buf,

&bsize,

cnt + patlen);

sptr++;

(void) memcpy(&buf[cnt],

patbeg, patlen);

cnt += patlen;

} else {

buf[cnt++] = *sptr++;

}

}

}

if (*t == 0) /* at end */

goto done;

expand_buf(&buf, &bsize, cnt);

buf[cnt++] = *t++;

mflag = 0;

} else { /* matched nonempty string */

num++;

sptr = t;

len = patbeg - sptr;

if (len > 0) {

expand_buf(&buf, &bsize, cnt + len);

(void) memcpy(&buf[cnt], sptr, len);

cnt += len;

}

sptr = rptr;

while (*sptr != 0) {

expand_buf(&buf, &bsize, cnt);

if (*sptr == '\\' && *(sptr+1) == '&') {

sptr++;

buf[cnt++] = *sptr++;

} else if (*sptr == '&') {

expand_buf(&buf, &bsize,

cnt + patlen);

sptr++;

(void) memcpy(&buf[cnt],

patbeg, patlen);

cnt += patlen;

} else {

buf[cnt++] = *sptr++;

}

}

t = patbeg + patlen;

if ((*(t-1) == 0) || (*t == 0))

goto done;

mflag = 1;

}

} while (pmatch(pfa, t));

sptr = t;

len = strlen((char *)sptr);

expand_buf(&buf, &bsize, len + cnt);

(void) memcpy(&buf[cnt], sptr, len);

cnt += len;

done:

buf[cnt] = '\0';

(void) setsval(x, buf);

free(buf);

pfa->initstat = tempstat;

}

tempfree(x, "");

tempfree(y, "");

x = gettemp("");

x->tval = NUM;

x->fval = num;

return (x);

}