/
run.c
2618 lines (2380 loc) · 58.4 KB
/
run.c
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/****************************************************************
Copyright (C) Lucent Technologies 1997
All Rights Reserved
Permission to use, copy, modify, and distribute this software and
its documentation for any purpose and without fee is hereby
granted, provided that the above copyright notice appear in all
copies and that both that the copyright notice and this
permission notice and warranty disclaimer appear in supporting
documentation, and that the name Lucent Technologies or any of
its entities not be used in advertising or publicity pertaining
to distribution of the software without specific, written prior
permission.
LUCENT DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
IN NO EVENT SHALL LUCENT OR ANY OF ITS ENTITIES BE LIABLE FOR ANY
SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
THIS SOFTWARE.
****************************************************************/
#define DEBUG
#include <stdio.h>
#include <ctype.h>
#include <errno.h>
#include <wctype.h>
#include <fcntl.h>
#include <setjmp.h>
#include <limits.h>
#include <math.h>
#include <string.h>
#include <stdlib.h>
#include <time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "awk.h"
#include "awkgram.tab.h"
static void stdinit(void);
static void flush_all(void);
static char *wide_char_to_byte_str(int rune, size_t *outlen);
#if 1
#define tempfree(x) do { if (istemp(x)) tfree(x); } while (/*CONSTCOND*/0)
#else
void tempfree(Cell *p) {
if (p->ctype == OCELL && (p->csub < CUNK || p->csub > CFREE)) {
WARNING("bad csub %d in Cell %d %s",
p->csub, p->ctype, p->sval);
}
if (istemp(p))
tfree(p);
}
#endif
/* do we really need these? */
/* #ifdef _NFILE */
/* #ifndef FOPEN_MAX */
/* #define FOPEN_MAX _NFILE */
/* #endif */
/* #endif */
/* */
/* #ifndef FOPEN_MAX */
/* #define FOPEN_MAX 40 */ /* max number of open files */
/* #endif */
/* */
/* #ifndef RAND_MAX */
/* #define RAND_MAX 32767 */ /* all that ansi guarantees */
/* #endif */
jmp_buf env;
extern int pairstack[];
extern Awkfloat srand_seed;
Node *winner = NULL; /* root of parse tree */
Cell *tmps; /* free temporary cells for execution */
static Cell truecell ={ OBOOL, BTRUE, 0, 0, 1.0, NUM, NULL, NULL };
Cell *True = &truecell;
static Cell falsecell ={ OBOOL, BFALSE, 0, 0, 0.0, NUM, NULL, NULL };
Cell *False = &falsecell;
static Cell breakcell ={ OJUMP, JBREAK, 0, 0, 0.0, NUM, NULL, NULL };
Cell *jbreak = &breakcell;
static Cell contcell ={ OJUMP, JCONT, 0, 0, 0.0, NUM, NULL, NULL };
Cell *jcont = &contcell;
static Cell nextcell ={ OJUMP, JNEXT, 0, 0, 0.0, NUM, NULL, NULL };
Cell *jnext = &nextcell;
static Cell nextfilecell ={ OJUMP, JNEXTFILE, 0, 0, 0.0, NUM, NULL, NULL };
Cell *jnextfile = &nextfilecell;
static Cell exitcell ={ OJUMP, JEXIT, 0, 0, 0.0, NUM, NULL, NULL };
Cell *jexit = &exitcell;
static Cell retcell ={ OJUMP, JRET, 0, 0, 0.0, NUM, NULL, NULL };
Cell *jret = &retcell;
static Cell tempcell ={ OCELL, CTEMP, 0, EMPTY, 0.0, NUM|STR|DONTFREE, NULL, NULL };
Node *curnode = NULL; /* the node being executed, for debugging */
/* buffer memory management */
int adjbuf(char **pbuf, int *psiz, int minlen, int quantum, char **pbptr,
const char *whatrtn)
/* pbuf: address of pointer to buffer being managed
* psiz: address of buffer size variable
* minlen: minimum length of buffer needed
* quantum: buffer size quantum
* pbptr: address of movable pointer into buffer, or 0 if none
* whatrtn: name of the calling routine if failure should cause fatal error
*
* return 0 for realloc failure, !=0 for success
*/
{
if (minlen > *psiz) {
char *tbuf;
int rminlen = quantum ? minlen % quantum : 0;
int boff = pbptr ? *pbptr - *pbuf : 0;
/* round up to next multiple of quantum */
if (rminlen)
minlen += quantum - rminlen;
tbuf = (char *) realloc(*pbuf, minlen);
DPRINTF("adjbuf %s: %d %d (pbuf=%p, tbuf=%p)\n", whatrtn, *psiz, minlen, (void*)*pbuf, (void*)tbuf);
if (tbuf == NULL) {
if (whatrtn)
FATAL("out of memory in %s", whatrtn);
return 0;
}
*pbuf = tbuf;
*psiz = minlen;
if (pbptr)
*pbptr = tbuf + boff;
}
return 1;
}
void run(Node *a) /* execution of parse tree starts here */
{
stdinit();
execute(a);
closeall();
}
Cell *execute(Node *u) /* execute a node of the parse tree */
{
Cell *(*proc)(Node **, int);
Cell *x;
Node *a;
if (u == NULL)
return(True);
for (a = u; ; a = a->nnext) {
curnode = a;
if (isvalue(a)) {
x = (Cell *) (a->narg[0]);
if (isfld(x) && !donefld)
fldbld();
else if (isrec(x) && !donerec)
recbld();
return(x);
}
if (notlegal(a->nobj)) /* probably a Cell* but too risky to print */
FATAL("illegal statement");
proc = proctab[a->nobj-FIRSTTOKEN];
x = (*proc)(a->narg, a->nobj);
if (isfld(x) && !donefld)
fldbld();
else if (isrec(x) && !donerec)
recbld();
if (isexpr(a))
return(x);
if (isjump(x))
return(x);
if (a->nnext == NULL)
return(x);
tempfree(x);
}
}
Cell *program(Node **a, int n) /* execute an awk program */
{ /* a[0] = BEGIN, a[1] = body, a[2] = END */
Cell *x;
if (setjmp(env) != 0)
goto ex;
if (a[0]) { /* BEGIN */
x = execute(a[0]);
if (isexit(x))
return(True);
if (isjump(x))
FATAL("illegal break, continue, next or nextfile from BEGIN");
tempfree(x);
}
if (a[1] || a[2])
while (getrec(&record, &recsize, true) > 0) {
x = execute(a[1]);
if (isexit(x))
break;
tempfree(x);
}
ex:
if (setjmp(env) != 0) /* handles exit within END */
goto ex1;
if (a[2]) { /* END */
x = execute(a[2]);
if (isbreak(x) || isnext(x) || iscont(x))
FATAL("illegal break, continue, next or nextfile from END");
tempfree(x);
}
ex1:
return(True);
}
struct Frame { /* stack frame for awk function calls */
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 50 /* max args in a call */
struct Frame *frame = NULL; /* base of stack frames; dynamically allocated */
int nframe = 0; /* number of frames allocated */
struct Frame *frp = NULL; /* frame pointer. bottom level unused */
Cell *call(Node **a, int n) /* function call. very kludgy and fragile */
{
static const Cell newcopycell = { OCELL, CCOPY, 0, EMPTY, 0.0, NUM|STR|DONTFREE, NULL, NULL };
int i, ncall, ndef;
int freed = 0; /* handles potential double freeing when fcn & param share a tempcell */
Node *x;
Cell *args[NARGS], *oargs[NARGS]; /* BUG: fixed size arrays */
Cell *y, *z, *fcn;
char *s;
fcn = execute(a[0]); /* the function itself */
s = fcn->nval;
if (!isfcn(fcn))
FATAL("calling undefined function %s", s);
if (frame == NULL) {
frp = frame = (struct Frame *) calloc(nframe += 100, sizeof(*frame));
if (frame == NULL)
FATAL("out of space for stack frames calling %s", s);
}
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), frp=%d\n", s, ncall, ndef, (int) (frp-frame));
if (ncall > ndef)
WARNING("function %s called with %d args, uses only %d",
s, ncall, ndef);
if (ncall + ndef > NARGS)
FATAL("function %s has %d arguments, limit %d", s, ncall+ndef, NARGS);
for (i = 0, x = a[1]; x != NULL; i++, x = x->nnext) { /* get call args */
DPRINTF("evaluate args[%d], frp=%d:\n", i, (int) (frp-frame));
y = execute(x);
oargs[i] = y;
DPRINTF("args[%d]: %s %f <%s>, t=%o\n",
i, NN(y->nval), y->fval, isarr(y) ? "(array)" : NN(y->sval), y->tval);
if (isfcn(y))
FATAL("can't use function %s as argument in %s", y->nval, s);
if (isarr(y))
args[i] = y; /* arrays by ref */
else
args[i] = copycell(y);
tempfree(y);
}
for ( ; i < ndef; i++) { /* add null args for ones not provided */
args[i] = gettemp();
*args[i] = newcopycell;
}
frp++; /* now ok to up frame */
if (frp >= frame + nframe) {
int dfp = frp - frame; /* old index */
frame = (struct Frame *) realloc(frame, (nframe += 100) * sizeof(*frame));
if (frame == NULL)
FATAL("out of space for stack frames in %s", s);
frp = frame + dfp;
}
frp->fcncell = fcn;
frp->args = args;
frp->nargs = ndef; /* number defined with (excess are locals) */
frp->retval = gettemp();
DPRINTF("start exec of %s, frp=%d\n", s, (int) (frp-frame));
y = execute((Node *)(fcn->sval)); /* execute body */
DPRINTF("finished exec of %s, frp=%d\n", s, (int) (frp-frame));
for (i = 0; i < ndef; i++) {
Cell *t = frp->args[i];
if (isarr(t)) {
if (t->csub == CCOPY) {
if (i >= ncall) {
freesymtab(t);
t->csub = CTEMP;
tempfree(t);
} else {
oargs[i]->tval = t->tval;
oargs[i]->tval &= ~(STR|NUM|DONTFREE);
oargs[i]->sval = t->sval;
tempfree(t);
}
}
} else if (t != y) { /* kludge to prevent freeing twice */
t->csub = CTEMP;
tempfree(t);
} else if (t == y && t->csub == CCOPY) {
t->csub = CTEMP;
tempfree(t);
freed = 1;
}
}
tempfree(fcn);
if (isexit(y) || isnext(y))
return y;
if (freed == 0) {
tempfree(y); /* don't free twice! */
}
z = frp->retval; /* return value */
DPRINTF("%s returns %g |%s| %o\n", s, getfval(z), getsval(z), z->tval);
frp--;
return(z);
}
Cell *copycell(Cell *x) /* make a copy of a cell in a temp */
{
Cell *y;
/* copy is not constant or field */
y = gettemp();
y->tval = x->tval & ~(CON|FLD|REC);
y->csub = CCOPY; /* prevents freeing until call is over */
y->nval = x->nval; /* BUG? */
if (isstr(x) /* || x->ctype == OCELL */) {
y->sval = tostring(x->sval);
y->tval &= ~DONTFREE;
} else
y->tval |= DONTFREE;
y->fval = x->fval;
return y;
}
Cell *arg(Node **a, int n) /* nth argument of a function */
{
n = ptoi(a[0]); /* argument number, counting from 0 */
DPRINTF("arg(%d), frp->nargs=%d\n", n, frp->nargs);
if (n+1 > frp->nargs)
FATAL("argument #%d of function %s was not supplied",
n+1, frp->fcncell->nval);
return frp->args[n];
}
Cell *jump(Node **a, int n) /* break, continue, next, nextfile, return */
{
Cell *y;
switch (n) {
case EXIT:
if (a[0] != NULL) {
y = execute(a[0]);
errorflag = (int) getfval(y);
tempfree(y);
}
longjmp(env, 1);
case RETURN:
if (a[0] != NULL) {
y = execute(a[0]);
if ((y->tval & (STR|NUM)) == (STR|NUM)) {
setsval(frp->retval, getsval(y));
frp->retval->fval = getfval(y);
frp->retval->tval |= NUM;
}
else if (y->tval & STR)
setsval(frp->retval, getsval(y));
else if (y->tval & NUM)
setfval(frp->retval, getfval(y));
else /* can't happen */
FATAL("bad type variable %d", y->tval);
tempfree(y);
}
return(jret);
case NEXT:
return(jnext);
case NEXTFILE:
nextfile();
return(jnextfile);
case BREAK:
return(jbreak);
case CONTINUE:
return(jcont);
default: /* can't happen */
FATAL("illegal jump type %d", n);
}
return 0; /* not reached */
}
Cell *awkgetline(Node **a, int n) /* get next line from specific input */
{ /* a[0] is variable, a[1] is operator, a[2] is filename */
Cell *r, *x;
extern Cell **fldtab;
FILE *fp;
char *buf;
int bufsize = recsize;
int mode;
bool newflag;
double result;
if ((buf = (char *) malloc(bufsize)) == NULL)
FATAL("out of memory in getline");
fflush(stdout); /* in case someone is waiting for a prompt */
r = gettemp();
if (a[1] != NULL) { /* getline < file */
x = execute(a[2]); /* filename */
mode = ptoi(a[1]);
if (mode == '|') /* input pipe */
mode = LE; /* arbitrary flag */
fp = openfile(mode, getsval(x), &newflag);
tempfree(x);
if (fp == NULL)
n = -1;
else
n = readrec(&buf, &bufsize, fp, newflag);
if (n <= 0) {
;
} else if (a[0] != NULL) { /* getline var <file */
x = execute(a[0]);
setsval(x, buf);
if (is_number(x->sval, & result)) {
x->fval = result;
x->tval |= NUM;
}
tempfree(x);
} else { /* getline <file */
setsval(fldtab[0], buf);
if (is_number(fldtab[0]->sval, & result)) {
fldtab[0]->fval = result;
fldtab[0]->tval |= NUM;
}
}
} else { /* bare getline; use current input */
if (a[0] == NULL) /* getline */
n = getrec(&record, &recsize, true);
else { /* getline var */
n = getrec(&buf, &bufsize, false);
if (n > 0) {
x = execute(a[0]);
setsval(x, buf);
if (is_number(x->sval, & result)) {
x->fval = result;
x->tval |= NUM;
}
tempfree(x);
}
}
}
setfval(r, (Awkfloat) n);
free(buf);
return r;
}
Cell *getnf(Node **a, int n) /* get NF */
{
if (!donefld)
fldbld();
return (Cell *) a[0];
}
static char *
makearraystring(Node *p, const char *func)
{
char *buf;
int bufsz = recsize;
size_t blen;
if ((buf = (char *) malloc(bufsz)) == NULL) {
FATAL("%s: out of memory", func);
}
blen = 0;
buf[blen] = '\0';
for (; p; p = p->nnext) {
Cell *x = execute(p); /* expr */
char *s = getsval(x);
size_t seplen = strlen(getsval(subseploc));
size_t nsub = p->nnext ? seplen : 0;
size_t slen = strlen(s);
size_t tlen = blen + slen + nsub;
if (!adjbuf(&buf, &bufsz, tlen + 1, recsize, 0, func)) {
FATAL("%s: out of memory %s[%s...]",
func, x->nval, buf);
}
memcpy(buf + blen, s, slen);
if (nsub) {
memcpy(buf + blen + slen, *SUBSEP, nsub);
}
buf[tlen] = '\0';
blen = tlen;
tempfree(x);
}
return buf;
}
Cell *array(Node **a, int n) /* a[0] is symtab, a[1] is list of subscripts */
{
Cell *x, *z;
char *buf;
x = execute(a[0]); /* Cell* for symbol table */
buf = makearraystring(a[1], __func__);
if (!isarr(x)) {
DPRINTF("making %s into an array\n", NN(x->nval));
if (freeable(x))
xfree(x->sval);
x->tval &= ~(STR|NUM|DONTFREE);
x->tval |= ARR;
x->sval = (char *) makesymtab(NSYMTAB);
}
z = setsymtab(buf, "", 0.0, STR|NUM, (Array *) x->sval);
z->ctype = OCELL;
z->csub = CVAR;
tempfree(x);
free(buf);
return(z);
}
Cell *awkdelete(Node **a, int n) /* a[0] is symtab, a[1] is list of subscripts */
{
Cell *x;
x = execute(a[0]); /* Cell* for symbol table */
if (x == symtabloc) {
FATAL("cannot delete SYMTAB or its elements");
}
if (!isarr(x))
return True;
if (a[1] == NULL) { /* delete the elements, not the table */
freesymtab(x);
x->tval &= ~STR;
x->tval |= ARR;
x->sval = (char *) makesymtab(NSYMTAB);
} else {
char *buf = makearraystring(a[1], __func__);
freeelem(x, buf);
free(buf);
}
tempfree(x);
return True;
}
Cell *intest(Node **a, int n) /* a[0] is index (list), a[1] is symtab */
{
Cell *ap, *k;
char *buf;
ap = execute(a[1]); /* array name */
if (!isarr(ap)) {
DPRINTF("making %s into an array\n", ap->nval);
if (freeable(ap))
xfree(ap->sval);
ap->tval &= ~(STR|NUM|DONTFREE);
ap->tval |= ARR;
ap->sval = (char *) makesymtab(NSYMTAB);
}
buf = makearraystring(a[0], __func__);
k = lookup(buf, (Array *) ap->sval);
tempfree(ap);
free(buf);
if (k == NULL)
return(False);
else
return(True);
}
/* ======== utf-8 code ========== */
/*
* Awk strings can contain ascii, random 8-bit items (eg Latin-1),
* or utf-8. u8_isutf tests whether a string starts with a valid
* utf-8 sequence, and returns 0 if not (e.g., high bit set).
* u8_nextlen returns length of next valid sequence, which is
* 1 for ascii, 2..4 for utf-8, or 1 for high bit non-utf.
* u8_strlen returns length of string in valid utf-8 sequences
* and/or high-bit bytes. Conversion functions go between byte
* number and character number.
*
* In theory, this behaves the same as before for non-utf8 bytes.
*
* Limited checking! This is a potential security hole.
*/
/* is s the beginning of a valid utf-8 string? */
/* return length 1..4 if yes, 0 if no */
int u8_isutf(const char *s)
{
int n, ret;
unsigned char c;
c = s[0];
if (c < 128 || awk_mb_cur_max == 1)
return 1; /* what if it's 0? */
n = strlen(s);
if (n >= 2 && ((c>>5) & 0x7) == 0x6 && (s[1] & 0xC0) == 0x80) {
ret = 2; /* 110xxxxx 10xxxxxx */
} else if (n >= 3 && ((c>>4) & 0xF) == 0xE && (s[1] & 0xC0) == 0x80
&& (s[2] & 0xC0) == 0x80) {
ret = 3; /* 1110xxxx 10xxxxxx 10xxxxxx */
} else if (n >= 4 && ((c>>3) & 0x1F) == 0x1E && (s[1] & 0xC0) == 0x80
&& (s[2] & 0xC0) == 0x80 && (s[3] & 0xC0) == 0x80) {
ret = 4; /* 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */
} else {
ret = 0;
}
return ret;
}
/* Convert (prefix of) utf8 string to utf-32 rune. */
/* Sets *rune to the value, returns the length. */
/* No error checking: watch out. */
int u8_rune(int *rune, const char *s)
{
int n, ret;
unsigned char c;
c = s[0];
if (c < 128 || awk_mb_cur_max == 1) {
*rune = c;
return 1;
}
n = strlen(s);
if (n >= 2 && ((c>>5) & 0x7) == 0x6 && (s[1] & 0xC0) == 0x80) {
*rune = ((c & 0x1F) << 6) | (s[1] & 0x3F); /* 110xxxxx 10xxxxxx */
ret = 2;
} else if (n >= 3 && ((c>>4) & 0xF) == 0xE && (s[1] & 0xC0) == 0x80
&& (s[2] & 0xC0) == 0x80) {
*rune = ((c & 0xF) << 12) | ((s[1] & 0x3F) << 6) | (s[2] & 0x3F);
/* 1110xxxx 10xxxxxx 10xxxxxx */
ret = 3;
} else if (n >= 4 && ((c>>3) & 0x1F) == 0x1E && (s[1] & 0xC0) == 0x80
&& (s[2] & 0xC0) == 0x80 && (s[3] & 0xC0) == 0x80) {
*rune = ((c & 0x7) << 18) | ((s[1] & 0x3F) << 12) | ((s[2] & 0x3F) << 6) | (s[3] & 0x3F);
/* 11110xxx 10xxxxxx 10xxxxxx 10xxxxxx */
ret = 4;
} else {
*rune = c;
ret = 1;
}
return ret; /* returns one byte if sequence doesn't look like utf */
}
/* return length of next sequence: 1 for ascii or random, 2..4 for valid utf8 */
int u8_nextlen(const char *s)
{
int len;
len = u8_isutf(s);
if (len == 0)
len = 1;
return len;
}
/* return number of utf characters or single non-utf bytes */
int u8_strlen(const char *s)
{
int i, len, n, totlen;
unsigned char c;
n = strlen(s);
totlen = 0;
for (i = 0; i < n; i += len) {
c = s[i];
if (c < 128 || awk_mb_cur_max == 1) {
len = 1;
} else {
len = u8_nextlen(&s[i]);
}
totlen++;
if (i > n)
FATAL("bad utf count [%s] n=%d i=%d\n", s, n, i);
}
return totlen;
}
/* convert utf-8 char number in a string to its byte offset */
int u8_char2byte(const char *s, int charnum)
{
int n;
int bytenum = 0;
while (charnum > 0) {
n = u8_nextlen(s);
s += n;
bytenum += n;
charnum--;
}
return bytenum;
}
/* convert byte offset in s to utf-8 char number that starts there */
int u8_byte2char(const char *s, int bytenum)
{
int i, len, b;
int charnum = 0; /* BUG: what origin? */
/* should be 0 to match start==0 which means no match */
b = strlen(s);
if (bytenum > b) {
return -1; /* ??? */
}
for (i = 0; i <= bytenum; i += len) {
len = u8_nextlen(s+i);
charnum++;
}
return charnum;
}
/* runetochar() adapted from rune.c in the Plan 9 distributione */
enum
{
Runeerror = 128, /* from somewhere else */
Runemax = 0x10FFFF,
Bit1 = 7,
Bitx = 6,
Bit2 = 5,
Bit3 = 4,
Bit4 = 3,
Bit5 = 2,
T1 = ((1<<(Bit1+1))-1) ^ 0xFF, /* 0000 0000 */
Tx = ((1<<(Bitx+1))-1) ^ 0xFF, /* 1000 0000 */
T2 = ((1<<(Bit2+1))-1) ^ 0xFF, /* 1100 0000 */
T3 = ((1<<(Bit3+1))-1) ^ 0xFF, /* 1110 0000 */
T4 = ((1<<(Bit4+1))-1) ^ 0xFF, /* 1111 0000 */
T5 = ((1<<(Bit5+1))-1) ^ 0xFF, /* 1111 1000 */
Rune1 = (1<<(Bit1+0*Bitx))-1, /* 0000 0000 0000 0000 0111 1111 */
Rune2 = (1<<(Bit2+1*Bitx))-1, /* 0000 0000 0000 0111 1111 1111 */
Rune3 = (1<<(Bit3+2*Bitx))-1, /* 0000 0000 1111 1111 1111 1111 */
Rune4 = (1<<(Bit4+3*Bitx))-1, /* 0011 1111 1111 1111 1111 1111 */
Maskx = (1<<Bitx)-1, /* 0011 1111 */
Testx = Maskx ^ 0xFF, /* 1100 0000 */
};
int runetochar(char *str, int c)
{
/* one character sequence 00000-0007F => 00-7F */
if (c <= Rune1) {
str[0] = c;
return 1;
}
/* two character sequence 00080-007FF => T2 Tx */
if (c <= Rune2) {
str[0] = T2 | (c >> 1*Bitx);
str[1] = Tx | (c & Maskx);
return 2;
}
/* three character sequence 00800-0FFFF => T3 Tx Tx */
if (c > Runemax)
c = Runeerror;
if (c <= Rune3) {
str[0] = T3 | (c >> 2*Bitx);
str[1] = Tx | ((c >> 1*Bitx) & Maskx);
str[2] = Tx | (c & Maskx);
return 3;
}
/* four character sequence 010000-1FFFFF => T4 Tx Tx Tx */
str[0] = T4 | (c >> 3*Bitx);
str[1] = Tx | ((c >> 2*Bitx) & Maskx);
str[2] = Tx | ((c >> 1*Bitx) & Maskx);
str[3] = Tx | (c & Maskx);
return 4;
}
/* ========== end of utf8 code =========== */
Cell *matchop(Node **a, int n) /* ~ and match() */
{
Cell *x, *y, *z;
char *s, *t;
int i;
int cstart, cpatlen, len;
fa *pfa;
int (*mf)(fa *, const char *) = match, mode = 0;
if (n == MATCHFCN) {
mf = pmatch;
mode = 1;
}
x = execute(a[1]); /* a[1] = target text */
s = getsval(x);
if (a[0] == NULL) /* a[1] == 0: already-compiled reg expr */
i = (*mf)((fa *) a[2], s);
else {
y = execute(a[2]); /* a[2] = regular expr */
t = getsval(y);
pfa = makedfa(t, mode);
i = (*mf)(pfa, s);
tempfree(y);
}
z = x;
if (n == MATCHFCN) {
int start = patbeg - s + 1; /* origin 1 */
if (patlen < 0) {
start = 0; /* not found */
} else {
cstart = u8_byte2char(s, start-1);
cpatlen = 0;
for (i = 0; i < patlen; i += len) {
len = u8_nextlen(patbeg+i);
cpatlen++;
}
start = cstart;
patlen = cpatlen;
}
setfval(rstartloc, (Awkfloat) start);
setfval(rlengthloc, (Awkfloat) patlen);
x = gettemp();
x->tval = NUM;
x->fval = start;
} else if ((n == MATCH && i == 1) || (n == NOTMATCH && i == 0))
x = True;
else
x = False;
tempfree(z);
return x;
}
Cell *boolop(Node **a, int n) /* a[0] || a[1], a[0] && a[1], !a[0] */
{
Cell *x, *y;
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);
if (i) return(True);
else return(False);
case AND:
if ( !i ) return(False);
y = execute(a[1]);
i = istrue(y);
tempfree(y);
if (i) return(True);
else return(False);
case NOT:
if (i) return(False);
else return(True);
default: /* can't happen */
FATAL("unknown boolean operator %d", n);
}
return 0; /*NOTREACHED*/
}
Cell *relop(Node **a, int n) /* a[0 < a[1], etc. */
{
int i;
Cell *x, *y;
Awkfloat j;
bool x_is_nan, y_is_nan;
x = execute(a[0]);
y = execute(a[1]);
x_is_nan = isnan(x->fval);
y_is_nan = isnan(y->fval);
if (x->tval&NUM && y->tval&NUM) {
if ((x_is_nan || y_is_nan) && n != NE)
return(False);
j = x->fval - y->fval;
i = j<0? -1: (j>0? 1: 0);
} else {
i = strcmp(getsval(x), getsval(y));
}
tempfree(x);
tempfree(y);
switch (n) {
case LT: if (i<0) return(True);
else return(False);
case LE: if (i<=0) return(True);
else return(False);
case NE: if (x_is_nan && y_is_nan) return(True);
else if (i!=0) return(True);
else return(False);
case EQ: if (i == 0) return(True);
else return(False);
case GE: if (i>=0) return(True);
else return(False);
case GT: if (i>0) return(True);
else return(False);
default: /* can't happen */
FATAL("unknown relational operator %d", n);
}
return 0; /*NOTREACHED*/
}
void tfree(Cell *a) /* free a tempcell */
{
if (freeable(a)) {
DPRINTF("freeing %s %s %o\n", NN(a->nval), NN(a->sval), a->tval);
xfree(a->sval);
}
if (a == tmps)
FATAL("tempcell list is curdled");
a->cnext = tmps;
tmps = a;
}
Cell *gettemp(void) /* get a tempcell */
{ int i;
Cell *x;
if (!tmps) {
tmps = (Cell *) calloc(100, sizeof(*tmps));
if (!tmps)
FATAL("out of space for temporaries");
for (i = 1; i < 100; i++)
tmps[i-1].cnext = &tmps[i];
tmps[i-1].cnext = NULL;
}
x = tmps;
tmps = x->cnext;
*x = tempcell;
return(x);
}
Cell *indirect(Node **a, int n) /* $( a[0] ) */
{
Awkfloat val;
Cell *x;
int m;
char *s;
x = execute(a[0]);
val = getfval(x); /* freebsd: defend against super large field numbers */
if ((Awkfloat)INT_MAX < val)
FATAL("trying to access out of range field %s", x->nval);
m = (int) val;
if (m == 0 && !is_number(s = getsval(x), NULL)) /* suspicion! */
FATAL("illegal field $(%s), name \"%s\"", s, x->nval);
/* BUG: can x->nval ever be null??? */
tempfree(x);
x = fieldadr(m);
x->ctype = OCELL; /* BUG? why are these needed? */
x->csub = CFLD;
return(x);
}
Cell *substr(Node **a, int nnn) /* substr(a[0], a[1], a[2]) */
{
int k, m, n;
int mb, nb;
char *s;
int temp;
Cell *x, *y, *z = NULL;
x = execute(a[0]);
y = execute(a[1]);
if (a[2] != NULL)
z = execute(a[2]);
s = getsval(x);
k = u8_strlen(s) + 1;
if (k <= 1) {
tempfree(x);
tempfree(y);
if (a[2] != NULL) {
tempfree(z);
}
x = gettemp();
setsval(x, "");
return(x);
}