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freebsd-dev/contrib/awk/builtin.c

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/*
* builtin.c - Builtin functions and various utility procedures
*/
/*
* Copyright (C) 1986, 1988, 1989, 1991-1997 the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Programming Language.
*
* GAWK is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GAWK is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "awk.h"
#include <assert.h>
#undef HUGE
#undef CHARBITS
#undef INTBITS
#include <math.h>
#ifndef __FreeBSD__
#include "random.h"
/* can declare these, since we always use the random shipped with gawk */
extern char *initstate P((unsigned seed, char *state, int n));
extern char *setstate P((char *state));
extern long random P((void));
extern void srandom P((unsigned int seed));
#endif
extern NODE **fields_arr;
extern int output_is_tty;
static NODE *sub_common P((NODE *tree, int how_many, int backdigs));
NODE *format_tree P((const char *, int, NODE *));
#ifdef _CRAY
/* Work around a problem in conversion of doubles to exact integers. */
#include <float.h>
#define Floor(n) floor((n) * (1.0 + DBL_EPSILON))
#define Ceil(n) ceil((n) * (1.0 + DBL_EPSILON))
/* Force the standard C compiler to use the library math functions. */
extern double exp(double);
double (*Exp)() = exp;
#define exp(x) (*Exp)(x)
extern double log(double);
double (*Log)() = log;
#define log(x) (*Log)(x)
#else
#define Floor(n) floor(n)
#define Ceil(n) ceil(n)
#endif
#define DEFAULT_G_PRECISION 6
#ifdef GFMT_WORKAROUND
/* semi-temporary hack, mostly to gracefully handle VMS */
static void sgfmt P((char *buf, const char *format, int alt,
int fwidth, int precision, double value));
#endif /* GFMT_WORKAROUND */
/*
* Since we supply the version of random(), we know what
* value to use here.
*/
#define GAWK_RANDOM_MAX 0x7fffffffL
static void efwrite P((const void *ptr, size_t size, size_t count, FILE *fp,
const char *from, struct redirect *rp, int flush));
/* efwrite --- like fwrite, but with error checking */
static void
efwrite(ptr, size, count, fp, from, rp, flush)
const void *ptr;
size_t size, count;
FILE *fp;
const char *from;
struct redirect *rp;
int flush;
{
errno = 0;
if (fwrite(ptr, size, count, fp) != count)
goto wrerror;
if (flush
&& ((fp == stdout && output_is_tty)
|| (rp && (rp->flag & RED_NOBUF)))) {
fflush(fp);
if (ferror(fp))
goto wrerror;
}
return;
wrerror:
fatal("%s to \"%s\" failed (%s)", from,
rp ? rp->value : "standard output",
errno ? strerror(errno) : "reason unknown");
}
/* do_exp --- exponential function */
NODE *
do_exp(tree)
NODE *tree;
{
NODE *tmp;
double d, res;
tmp = tree_eval(tree->lnode);
d = force_number(tmp);
free_temp(tmp);
errno = 0;
res = exp(d);
if (errno == ERANGE)
warning("exp argument %g is out of range", d);
return tmp_number((AWKNUM) res);
}
/* stdfile --- return fp for a standard file */
/*
* This function allows `fflush("/dev/stdout")' to work.
* The other files will be available via getredirect().
* /dev/stdin is not included, since fflush is only for output.
*/
static FILE *
stdfile(name, len)
char *name;
size_t len;
{
if (len == 11) {
if (STREQN(name, "/dev/stderr", 11))
return stderr;
else if (STREQN(name, "/dev/stdout", 11))
return stdout;
}
return NULL;
}
/* do_fflush --- flush output, either named file or pipe or everything */
NODE *
do_fflush(tree)
NODE *tree;
{
struct redirect *rp;
NODE *tmp;
FILE *fp;
int status = 0;
char *file;
/* fflush() --- flush stdout */
if (tree == NULL) {
status = fflush(stdout);
return tmp_number((AWKNUM) status);
}
tmp = tree_eval(tree->lnode);
tmp = force_string(tmp);
file = tmp->stptr;
/* fflush("") --- flush all */
if (tmp->stlen == 0) {
status = flush_io();
free_temp(tmp);
return tmp_number((AWKNUM) status);
}
rp = getredirect(tmp->stptr, tmp->stlen);
status = 1;
if (rp != NULL) {
if ((rp->flag & (RED_WRITE|RED_APPEND)) == 0) {
/* if (do_lint) */
warning(
"fflush: cannot flush: %s `%s' opened for reading, not writing",
(rp->flag & RED_PIPE) ? "pipe" : "file",
file);
free_temp(tmp);
return tmp_number((AWKNUM) status);
}
fp = rp->fp;
if (fp != NULL)
status = fflush(fp);
} else if ((fp = stdfile(tmp->stptr, tmp->stlen)) != NULL) {
status = fflush(fp);
} else
warning("fflush: `%s' is not an open file or pipe", file);
free_temp(tmp);
return tmp_number((AWKNUM) status);
}
/* do_index --- find index of a string */
NODE *
do_index(tree)
NODE *tree;
{
NODE *s1, *s2;
register char *p1, *p2;
register size_t l1, l2;
long ret;
s1 = tree_eval(tree->lnode);
s2 = tree_eval(tree->rnode->lnode);
force_string(s1);
force_string(s2);
p1 = s1->stptr;
p2 = s2->stptr;
l1 = s1->stlen;
l2 = s2->stlen;
ret = 0;
/* IGNORECASE will already be false if posix */
if (IGNORECASE) {
while (l1 > 0) {
if (l2 > l1)
break;
if (casetable[(int)*p1] == casetable[(int)*p2]
&& (l2 == 1 || strncasecmp(p1, p2, l2) == 0)) {
ret = 1 + s1->stlen - l1;
break;
}
l1--;
p1++;
}
} else {
while (l1 > 0) {
if (l2 > l1)
break;
if (*p1 == *p2
&& (l2 == 1 || STREQN(p1, p2, l2))) {
ret = 1 + s1->stlen - l1;
break;
}
l1--;
p1++;
}
}
free_temp(s1);
free_temp(s2);
return tmp_number((AWKNUM) ret);
}
/* double_to_int --- convert double to int, used several places */
double
double_to_int(d)
double d;
{
if (d >= 0)
d = Floor(d);
else
d = Ceil(d);
return d;
}
/* do_int --- convert double to int for awk */
NODE *
do_int(tree)
NODE *tree;
{
NODE *tmp;
double d;
tmp = tree_eval(tree->lnode);
d = force_number(tmp);
d = double_to_int(d);
free_temp(tmp);
return tmp_number((AWKNUM) d);
}
/* do_length --- length of a string or $0 */
NODE *
do_length(tree)
NODE *tree;
{
NODE *tmp;
size_t len;
tmp = tree_eval(tree->lnode);
len = force_string(tmp)->stlen;
free_temp(tmp);
return tmp_number((AWKNUM) len);
}
/* do_log --- the log function */
NODE *
do_log(tree)
NODE *tree;
{
NODE *tmp;
double d, arg;
tmp = tree_eval(tree->lnode);
arg = (double) force_number(tmp);
if (arg < 0.0)
warning("log called with negative argument %g", arg);
d = log(arg);
free_temp(tmp);
return tmp_number((AWKNUM) d);
}
/*
* format_tree() formats nodes of a tree, starting with a left node,
* and accordingly to a fmt_string providing a format like in
* printf family from C library. Returns a string node which value
* is a formatted string. Called by sprintf function.
*
* It is one of the uglier parts of gawk. Thanks to Michal Jaegermann
* for taming this beast and making it compatible with ANSI C.
*/
NODE *
format_tree(fmt_string, n0, carg)
const char *fmt_string;
int n0;
register NODE *carg;
{
/* copy 'l' bytes from 's' to 'obufout' checking for space in the process */
/* difference of pointers should be of ptrdiff_t type, but let us be kind */
#define bchunk(s, l) if (l) { \
while ((l) > ofre) { \
long olen = obufout - obuf; \
erealloc(obuf, char *, osiz * 2, "format_tree"); \
ofre += osiz; \
osiz *= 2; \
obufout = obuf + olen; \
} \
memcpy(obufout, s, (size_t) (l)); \
obufout += (l); \
ofre -= (l); \
}
/* copy one byte from 's' to 'obufout' checking for space in the process */
#define bchunk_one(s) { \
if (ofre <= 0) { \
long olen = obufout - obuf; \
erealloc(obuf, char *, osiz * 2, "format_tree"); \
ofre += osiz; \
osiz *= 2; \
obufout = obuf + olen; \
} \
*obufout++ = *s; \
--ofre; \
}
/* Is there space for something L big in the buffer? */
#define chksize(l) if ((l) > ofre) { \
long olen = obufout - obuf; \
erealloc(obuf, char *, osiz * 2, "format_tree"); \
obufout = obuf + olen; \
ofre += osiz; \
osiz *= 2; \
}
/*
* Get the next arg to be formatted. If we've run out of args,
* return "" (Null string)
*/
#define parse_next_arg() { \
if (carg == NULL) { \
toofew = TRUE; \
break; \
} else { \
arg = tree_eval(carg->lnode); \
carg = carg->rnode; \
} \
}
NODE *r;
int toofew = FALSE;
char *obuf, *obufout;
size_t osiz, ofre;
char *chbuf;
const char *s0, *s1;
int cs1;
NODE *arg;
long fw, prec;
int lj, alt, big, bigbig, small, have_prec, need_format;
long *cur = NULL;
#ifdef sun386 /* Can't cast unsigned (int/long) from ptr->value */
long tmp_uval; /* on 386i 4.0.1 C compiler -- it just hangs */
#endif
unsigned long uval;
int sgn;
int base = 0;
char cpbuf[30]; /* if we have numbers bigger than 30 */
char *cend = &cpbuf[30];/* chars, we lose, but seems unlikely */
char *cp;
char *fill;
double tmpval;
char signchar = FALSE;
size_t len;
static char sp[] = " ";
static char zero_string[] = "0";
static char lchbuf[] = "0123456789abcdef";
static char Uchbuf[] = "0123456789ABCDEF";
#define INITIAL_OUT_SIZE 512
emalloc(obuf, char *, INITIAL_OUT_SIZE, "format_tree");
obufout = obuf;
osiz = INITIAL_OUT_SIZE;
ofre = osiz - 1;
need_format = FALSE;
s0 = s1 = fmt_string;
while (n0-- > 0) {
if (*s1 != '%') {
s1++;
continue;
}
need_format = TRUE;
bchunk(s0, s1 - s0);
s0 = s1;
cur = &fw;
fw = 0;
prec = 0;
have_prec = FALSE;
signchar = FALSE;
lj = alt = big = bigbig = small = FALSE;
fill = sp;
cp = cend;
chbuf = lchbuf;
s1++;
retry:
if (n0-- <= 0) /* ran out early! */
break;
switch (cs1 = *s1++) {
case (-1): /* dummy case to allow for checking */
check_pos:
if (cur != &fw)
break; /* reject as a valid format */
goto retry;
case '%':
need_format = FALSE;
bchunk_one("%");
s0 = s1;
break;
case '0':
if (lj)
goto retry;
if (cur == &fw)
fill = zero_string;
/* FALL through */
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (cur == NULL)
break;
if (prec >= 0)
*cur = cs1 - '0';
/*
* with a negative precision *cur is already set
* to -1, so it will remain negative, but we have
* to "eat" precision digits in any case
*/
while (n0 > 0 && *s1 >= '0' && *s1 <= '9') {
--n0;
*cur = *cur * 10 + *s1++ - '0';
}
if (prec < 0) /* negative precision is discarded */
have_prec = FALSE;
if (cur == &prec)
cur = NULL;
if (n0 == 0) /* badly formatted control string */
continue;
goto retry;
case '*':
if (cur == NULL)
break;
parse_next_arg();
*cur = force_number(arg);
free_temp(arg);
if (*cur < 0 && cur == &fw) {
*cur = -*cur;
lj++;
}
if (cur == &prec) {
if (*cur >= 0)
have_prec = TRUE;
else
have_prec = FALSE;
cur = NULL;
}
goto retry;
case ' ': /* print ' ' or '-' */
/* 'space' flag is ignored */
/* if '+' already present */
if (signchar != FALSE)
goto check_pos;
/* FALL THROUGH */
case '+': /* print '+' or '-' */
signchar = cs1;
goto check_pos;
case '-':
if (prec < 0)
break;
if (cur == &prec) {
prec = -1;
goto retry;
}
fill = sp; /* if left justified then other */
lj++; /* filling is ignored */
goto check_pos;
case '.':
if (cur != &fw)
break;
cur = &prec;
have_prec = TRUE;
goto retry;
case '#':
alt = TRUE;
goto check_pos;
case 'l':
if (big)
break;
else {
static int warned = FALSE;
if (do_lint && ! warned) {
warning("`l' is meaningless in awk formats; ignored");
warned = TRUE;
}
if (do_posix)
fatal("'l' is not permitted in POSIX awk formats");
}
big = TRUE;
goto retry;
case 'L':
if (bigbig)
break;
else {
static int warned = FALSE;
if (do_lint && ! warned) {
warning("`L' is meaningless in awk formats; ignored");
warned = TRUE;
}
if (do_posix)
fatal("'L' is not permitted in POSIX awk formats");
}
bigbig = TRUE;
goto retry;
case 'h':
if (small)
break;
else {
static int warned = FALSE;
if (do_lint && ! warned) {
warning("`h' is meaningless in awk formats; ignored");
warned = TRUE;
}
if (do_posix)
fatal("'h' is not permitted in POSIX awk formats");
}
small = TRUE;
goto retry;
case 'c':
need_format = FALSE;
parse_next_arg();
/* user input that looks numeric is numeric */
if ((arg->flags & (MAYBE_NUM|NUMBER)) == MAYBE_NUM)
(void) force_number(arg);
if (arg->flags & NUMBER) {
#ifdef sun386
tmp_uval = arg->numbr;
uval = (unsigned long) tmp_uval;
#else
uval = (unsigned long) arg->numbr;
#endif
cpbuf[0] = uval;
prec = 1;
cp = cpbuf;
goto pr_tail;
}
if (have_prec == FALSE)
prec = 1;
else if (prec > arg->stlen)
prec = arg->stlen;
cp = arg->stptr;
goto pr_tail;
case 's':
need_format = FALSE;
parse_next_arg();
arg = force_string(arg);
if (! have_prec || prec > arg->stlen)
prec = arg->stlen;
cp = arg->stptr;
goto pr_tail;
case 'd':
case 'i':
need_format = FALSE;
parse_next_arg();
tmpval = force_number(arg);
if (tmpval < 0) {
if (tmpval < LONG_MIN)
goto out_of_range;
sgn = TRUE;
uval = - (unsigned long) (long) tmpval;
} else {
/* Use !, so that NaNs are out of range.
The cast avoids a SunOS 4.1.x cc bug. */
if (! (tmpval <= (unsigned long) ULONG_MAX))
goto out_of_range;
sgn = FALSE;
uval = (unsigned long) tmpval;
}
do {
*--cp = (char) ('0' + uval % 10);
uval /= 10;
} while (uval > 0);
if (sgn)
*--cp = '-';
else if (signchar)
*--cp = signchar;
/*
* precision overrides '0' flags. however, for
* integer formats, precsion is minimum number of
* *digits*, not characters, thus we want to fill
* with zeroes.
*/
if (have_prec)
fill = zero_string;
if (prec > fw)
fw = prec;
prec = cend - cp;
if (fw > prec && ! lj && fill != sp
&& (*cp == '-' || signchar)) {
bchunk_one(cp);
cp++;
prec--;
fw--;
}
goto pr_tail;
case 'X':
chbuf = Uchbuf; /* FALL THROUGH */
case 'x':
base += 6; /* FALL THROUGH */
case 'u':
base += 2; /* FALL THROUGH */
case 'o':
base += 8;
need_format = FALSE;
parse_next_arg();
tmpval = force_number(arg);
if (tmpval < 0) {
if (tmpval < LONG_MIN)
goto out_of_range;
uval = (unsigned long) (long) tmpval;
} else {
/* Use !, so that NaNs are out of range.
The cast avoids a SunOS 4.1.x cc bug. */
if (! (tmpval <= (unsigned long) ULONG_MAX))
goto out_of_range;
uval = (unsigned long) tmpval;
}
/*
* precision overrides '0' flags. however, for
* integer formats, precsion is minimum number of
* *digits*, not characters, thus we want to fill
* with zeroes.
*/
if (have_prec)
fill = zero_string;
do {
*--cp = chbuf[uval % base];
uval /= base;
} while (uval > 0);
if (alt) {
if (base == 16) {
*--cp = cs1;
*--cp = '0';
if (fill != sp) {
bchunk(cp, 2);
cp += 2;
fw -= 2;
}
} else if (base == 8)
*--cp = '0';
}
base = 0;
if (prec > fw)
fw = prec;
prec = cend - cp;
pr_tail:
if (! lj) {
while (fw > prec) {
bchunk_one(fill);
fw--;
}
}
bchunk(cp, (int) prec);
while (fw > prec) {
bchunk_one(fill);
fw--;
}
s0 = s1;
free_temp(arg);
break;
out_of_range:
/* out of range - emergency use of %g format */
cs1 = 'g';
goto format_float;
case 'g':
case 'G':
case 'e':
case 'f':
case 'E':
need_format = FALSE;
parse_next_arg();
tmpval = force_number(arg);
format_float:
free_temp(arg);
if (! have_prec)
prec = DEFAULT_G_PRECISION;
chksize(fw + prec + 9); /* 9 == slop */
cp = cpbuf;
*cp++ = '%';
if (lj)
*cp++ = '-';
if (signchar)
*cp++ = signchar;
if (alt)
*cp++ = '#';
if (fill != sp)
*cp++ = '0';
cp = strcpy(cp, "*.*") + 3;
*cp++ = cs1;
*cp = '\0';
#ifndef GFMT_WORKAROUND
(void) sprintf(obufout, cpbuf,
(int) fw, (int) prec, (double) tmpval);
#else /* GFMT_WORKAROUND */
if (cs1 == 'g' || cs1 == 'G')
sgfmt(obufout, cpbuf, (int) alt,
(int) fw, (int) prec, (double) tmpval);
else
(void) sprintf(obufout, cpbuf,
(int) fw, (int) prec, (double) tmpval);
#endif /* GFMT_WORKAROUND */
len = strlen(obufout);
ofre -= len;
obufout += len;
s0 = s1;
break;
default:
break;
}
if (toofew)
fatal("%s\n\t`%s'\n\t%*s%s",
"not enough arguments to satisfy format string",
fmt_string, s1 - fmt_string - 2, "",
"^ ran out for this one"
);
}
if (do_lint) {
if (need_format)
warning(
"printf format specifier does not have control letter");
if (carg != NULL)
warning(
"too many arguments supplied for format string");
}
bchunk(s0, s1 - s0);
r = make_str_node(obuf, obufout - obuf, ALREADY_MALLOCED);
r->flags |= TEMP;
return r;
}
/* do_sprintf --- perform sprintf */
NODE *
do_sprintf(tree)
NODE *tree;
{
NODE *r;
NODE *sfmt = force_string(tree_eval(tree->lnode));
r = format_tree(sfmt->stptr, sfmt->stlen, tree->rnode);
free_temp(sfmt);
return r;
}
/* do_printf --- perform printf, including redirection */
void
do_printf(tree)
register NODE *tree;
{
struct redirect *rp = NULL;
register FILE *fp;
if (tree->lnode == NULL) {
if (do_traditional) {
if (do_lint)
warning("printf: no arguments");
return; /* bwk accepts it silently */
}
fatal("printf: no arguments");
}
if (tree->rnode != NULL) {
int errflg; /* not used, sigh */
rp = redirect(tree->rnode, &errflg);
if (rp != NULL) {
fp = rp->fp;
if (fp == NULL)
return;
} else
return;
} else
fp = stdout;
tree = do_sprintf(tree->lnode);
efwrite(tree->stptr, sizeof(char), tree->stlen, fp, "printf", rp, TRUE);
free_temp(tree);
}
/* do_sqrt --- do the sqrt function */
NODE *
do_sqrt(tree)
NODE *tree;
{
NODE *tmp;
double arg;
tmp = tree_eval(tree->lnode);
arg = (double) force_number(tmp);
free_temp(tmp);
if (arg < 0.0)
warning("sqrt called with negative argument %g", arg);
return tmp_number((AWKNUM) sqrt(arg));
}
/* do_substr --- do the substr function */
NODE *
do_substr(tree)
NODE *tree;
{
NODE *t1, *t2, *t3;
NODE *r;
register size_t indx;
size_t length;
double d_index, d_length;
t1 = force_string(tree_eval(tree->lnode));
t2 = tree_eval(tree->rnode->lnode);
d_index = force_number(t2);
free_temp(t2);
if (d_index < 1.0) {
if (do_lint)
warning("substr: start index %g invalid, using 1",
d_index);
d_index = 1;
}
if (do_lint && double_to_int(d_index) != d_index)
warning("substr: non-integer start index %g will be truncated",
d_index);
indx = d_index - 1; /* awk indices are from 1, C's are from 0 */
if (tree->rnode->rnode == NULL) { /* third arg. missing */
/* use remainder of string */
length = t1->stlen - indx;
} else {
t3 = tree_eval(tree->rnode->rnode->lnode);
d_length = force_number(t3);
free_temp(t3);
if (d_length <= 0.0) {
if (do_lint)
warning("substr: length %g is <= 0", d_length);
free_temp(t1);
return Nnull_string;
}
if (do_lint && double_to_int(d_length) != d_length)
warning(
"substr: non-integer length %g will be truncated",
d_length);
length = d_length;
}
if (t1->stlen == 0) {
if (do_lint)
warning("substr: source string is zero length");
free_temp(t1);
return Nnull_string;
}
if ((indx + length) > t1->stlen) {
if (do_lint)
warning(
"substr: length %d at position %d exceeds length of first argument (%d)",
length, indx+1, t1->stlen);
length = t1->stlen - indx;
}
if (indx >= t1->stlen) {
if (do_lint)
warning("substr: start index %d is past end of string",
indx+1);
free_temp(t1);
return Nnull_string;
}
r = tmp_string(t1->stptr + indx, length);
free_temp(t1);
return r;
}
/* do_strftime --- format a time stamp */
NODE *
do_strftime(tree)
NODE *tree;
{
NODE *t1, *t2, *ret;
struct tm *tm;
time_t fclock;
char *bufp;
size_t buflen, bufsize;
char buf[BUFSIZ];
static char def_format[] = "%a %b %d %H:%M:%S %Z %Y";
char *format;
int formatlen;
/* set defaults first */
format = def_format; /* traditional date format */
formatlen = strlen(format);
(void) time(&fclock); /* current time of day */
t1 = t2 = NULL;
if (tree != NULL) { /* have args */
if (tree->lnode != NULL) {
t1 = force_string(tree_eval(tree->lnode));
format = t1->stptr;
formatlen = t1->stlen;
if (formatlen == 0) {
if (do_lint)
warning("strftime called with empty format string");
free_temp(t1);
return tmp_string("", 0);
}
}
if (tree->rnode != NULL) {
t2 = tree_eval(tree->rnode->lnode);
fclock = (time_t) force_number(t2);
free_temp(t2);
}
}
tm = localtime(&fclock);
bufp = buf;
bufsize = sizeof(buf);
for (;;) {
*bufp = '\0';
buflen = strftime(bufp, bufsize, format, tm);
/*
* buflen can be zero EITHER because there's not enough
* room in the string, or because the control command
* goes to the empty string. Make a reasonable guess that
* if the buffer is 1024 times bigger than the length of the
* format string, it's not failing for lack of room.
* Thanks to Paul Eggert for pointing out this issue.
*/
if (buflen > 0 || bufsize >= 1024 * formatlen)
break;
bufsize *= 2;
if (bufp == buf)
emalloc(bufp, char *, bufsize, "do_strftime");
else
erealloc(bufp, char *, bufsize, "do_strftime");
}
ret = tmp_string(bufp, buflen);
if (bufp != buf)
free(bufp);
if (t1)
free_temp(t1);
return ret;
}
/* do_systime --- get the time of day */
NODE *
do_systime(tree)
NODE *tree;
{
time_t lclock;
(void) time(&lclock);
return tmp_number((AWKNUM) lclock);
}
/* do_system --- run an external command */
NODE *
do_system(tree)
NODE *tree;
{
NODE *tmp;
int ret = 0;
char *cmd;
char save;
(void) flush_io(); /* so output is synchronous with gawk's */
tmp = tree_eval(tree->lnode);
cmd = force_string(tmp)->stptr;
if (cmd && *cmd) {
/* insure arg to system is zero-terminated */
/*
* From: David Trueman <david@cs.dal.ca>
* To: arnold@cc.gatech.edu (Arnold Robbins)
* Date: Wed, 3 Nov 1993 12:49:41 -0400
*
* It may not be necessary to save the character, but
* I'm not sure. It would normally be the field
* separator. If the parse has not yet gone beyond
* that, it could mess up (although I doubt it). If
* FIELDWIDTHS is being used, it might be the first
* character of the next field. Unless someone wants
* to check it out exhaustively, I suggest saving it
* for now...
*/
save = cmd[tmp->stlen];
cmd[tmp->stlen] = '\0';
ret = system(cmd);
ret = (ret >> 8) & 0xff;
cmd[tmp->stlen] = save;
}
free_temp(tmp);
return tmp_number((AWKNUM) ret);
}
extern NODE **fmt_list; /* declared in eval.c */
/* do_print --- print items, separated by OFS, terminated with ORS */
void
do_print(tree)
register NODE *tree;
{
register NODE **t;
struct redirect *rp = NULL;
register FILE *fp;
int numnodes, i;
NODE *save;
if (tree->rnode) {
int errflg; /* not used, sigh */
rp = redirect(tree->rnode, &errflg);
if (rp != NULL) {
fp = rp->fp;
if (fp == NULL)
return;
} else
return;
} else
fp = stdout;
/*
* General idea is to evaluate all the expressions first and
* then print them, otherwise you get suprising behavior.
* See test/prtoeval.awk for an example program.
*/
save = tree = tree->lnode;
for (numnodes = 0; tree != NULL; tree = tree->rnode)
numnodes++;
emalloc(t, NODE **, numnodes * sizeof(NODE *), "do_print");
tree = save;
for (i = 0; tree != NULL; i++, tree = tree->rnode) {
NODE *n;
/* Here lies the wumpus. R.I.P. */
n = tree_eval(tree->lnode);
t[i] = dupnode(n);
free_temp(n);
if (t[i]->flags & NUMBER) {
if (OFMTidx == CONVFMTidx)
(void) force_string(t[i]);
else
t[i] = format_val(OFMT, OFMTidx, t[i]);
}
}
for (i = 0; i < numnodes; i++) {
efwrite(t[i]->stptr, sizeof(char), t[i]->stlen, fp, "print", rp, FALSE);
unref(t[i]);
if (i != numnodes - 1) {
if (OFSlen > 0)
efwrite(OFS, sizeof(char), (size_t) OFSlen,
fp, "print", rp, FALSE);
}
}
if (ORSlen > 0)
efwrite(ORS, sizeof(char), (size_t) ORSlen, fp, "print", rp, TRUE);
free(t);
}
/* do_tolower --- lower case a string */
NODE *
do_tolower(tree)
NODE *tree;
{
NODE *t1, *t2;
register unsigned char *cp, *cp2;
t1 = tree_eval(tree->lnode);
t1 = force_string(t1);
t2 = tmp_string(t1->stptr, t1->stlen);
for (cp = (unsigned char *)t2->stptr,
cp2 = (unsigned char *)(t2->stptr + t2->stlen); cp < cp2; cp++)
if (ISUPPER(*cp))
*cp = tolower(*cp);
free_temp(t1);
return t2;
}
/* do_toupper --- upper case a string */
NODE *
do_toupper(tree)
NODE *tree;
{
NODE *t1, *t2;
register unsigned char *cp, *cp2;
t1 = tree_eval(tree->lnode);
t1 = force_string(t1);
t2 = tmp_string(t1->stptr, t1->stlen);
for (cp = (unsigned char *)t2->stptr,
cp2 = (unsigned char *)(t2->stptr + t2->stlen); cp < cp2; cp++)
if (ISLOWER(*cp))
*cp = toupper(*cp);
free_temp(t1);
return t2;
}
/* do_atan2 --- do the atan2 function */
NODE *
do_atan2(tree)
NODE *tree;
{
NODE *t1, *t2;
double d1, d2;
t1 = tree_eval(tree->lnode);
t2 = tree_eval(tree->rnode->lnode);
d1 = force_number(t1);
d2 = force_number(t2);
free_temp(t1);
free_temp(t2);
return tmp_number((AWKNUM) atan2(d1, d2));
}
/* do_sin --- do the sin function */
NODE *
do_sin(tree)
NODE *tree;
{
NODE *tmp;
double d;
tmp = tree_eval(tree->lnode);
d = sin((double) force_number(tmp));
free_temp(tmp);
return tmp_number((AWKNUM) d);
}
/* do_cos --- do the cos function */
NODE *
do_cos(tree)
NODE *tree;
{
NODE *tmp;
double d;
tmp = tree_eval(tree->lnode);
d = cos((double) force_number(tmp));
free_temp(tmp);
return tmp_number((AWKNUM) d);
}
/* do_rand --- do the rand function */
static int firstrand = TRUE;
static char state[512];
/* ARGSUSED */
NODE *
do_rand(tree)
NODE *tree;
{
if (firstrand) {
(void) initstate((unsigned) 1, state, sizeof state);
srandom(1);
firstrand = FALSE;
}
return tmp_number((AWKNUM) random() / GAWK_RANDOM_MAX);
}
/* do_srand --- seed the random number generator */
NODE *
do_srand(tree)
NODE *tree;
{
NODE *tmp;
static long save_seed = 1;
long ret = save_seed; /* SVR4 awk srand returns previous seed */
if (firstrand) {
(void) initstate((unsigned) 1, state, sizeof state);
/* don't need to srandom(1), we're changing the seed below */
firstrand = FALSE;
} else
(void) setstate(state);
if (tree == NULL)
#ifdef __FreeBSD__
srandom((unsigned int) (save_seed = (long) time((time_t *) 0) ^ getpid()));
#else
srandom((unsigned int) (save_seed = (long) time((time_t *) 0)));
#endif
else {
tmp = tree_eval(tree->lnode);
srandom((unsigned int) (save_seed = (long) force_number(tmp)));
free_temp(tmp);
}
return tmp_number((AWKNUM) ret);
}
/* do_match --- match a regexp, set RSTART and RLENGTH */
NODE *
do_match(tree)
NODE *tree;
{
NODE *t1;
int rstart;
AWKNUM rlength;
Regexp *rp;
t1 = force_string(tree_eval(tree->lnode));
tree = tree->rnode->lnode;
rp = re_update(tree);
rstart = research(rp, t1->stptr, 0, t1->stlen, TRUE);
if (rstart >= 0) { /* match succeded */
rstart++; /* 1-based indexing */
rlength = REEND(rp, t1->stptr) - RESTART(rp, t1->stptr);
} else { /* match failed */
rstart = 0;
rlength = -1.0;
}
free_temp(t1);
unref(RSTART_node->var_value);
RSTART_node->var_value = make_number((AWKNUM) rstart);
unref(RLENGTH_node->var_value);
RLENGTH_node->var_value = make_number(rlength);
return tmp_number((AWKNUM) rstart);
}
/* sub_common --- the common code (does the work) for sub, gsub, and gensub */
/*
* Gsub can be tricksy; particularly when handling the case of null strings.
* The following awk code was useful in debugging problems. It is too bad
* that it does not readily translate directly into the C code, below.
*
* #! /usr/local/bin/mawk -f
*
* BEGIN {
* TRUE = 1; FALSE = 0
* print "--->", mygsub("abc", "b+", "FOO")
* print "--->", mygsub("abc", "x*", "X")
* print "--->", mygsub("abc", "b*", "X")
* print "--->", mygsub("abc", "c", "X")
* print "--->", mygsub("abc", "c+", "X")
* print "--->", mygsub("abc", "x*$", "X")
* }
*
* function mygsub(str, regex, replace, origstr, newstr, eosflag, nonzeroflag)
* {
* origstr = str;
* eosflag = nonzeroflag = FALSE
* while (match(str, regex)) {
* if (RLENGTH > 0) { # easy case
* nonzeroflag = TRUE
* if (RSTART == 1) { # match at front of string
* newstr = newstr replace
* } else {
* newstr = newstr substr(str, 1, RSTART-1) replace
* }
* str = substr(str, RSTART+RLENGTH)
* } else if (nonzeroflag) {
* # last match was non-zero in length, and at the
* # current character, we get a zero length match,
* # which we don't really want, so skip over it
* newstr = newstr substr(str, 1, 1)
* str = substr(str, 2)
* nonzeroflag = FALSE
* } else {
* # 0-length match
* if (RSTART == 1) {
* newstr = newstr replace substr(str, 1, 1)
* str = substr(str, 2)
* } else {
* return newstr str replace
* }
* }
* if (length(str) == 0)
* if (eosflag)
* break;
* else
* eosflag = TRUE
* }
* if (length(str) > 0)
* newstr = newstr str # rest of string
*
* return newstr
* }
*/
/*
* NB: `howmany' conflicts with a SunOS macro in <sys/param.h>.
*/
static NODE *
sub_common(tree, how_many, backdigs)
NODE *tree;
int how_many, backdigs;
{
register char *scan;
register char *bp, *cp;
char *buf;
size_t buflen;
register char *matchend;
register size_t len;
char *matchstart;
char *text;
size_t textlen;
char *repl;
char *replend;
size_t repllen;
int sofar;
int ampersands;
int matches = 0;
Regexp *rp;
NODE *s; /* subst. pattern */
NODE *t; /* string to make sub. in; $0 if none given */
NODE *tmp;
NODE **lhs = &tree; /* value not used -- just different from NULL */
int priv = FALSE;
Func_ptr after_assign = NULL;
int global = (how_many == -1);
long current;
int lastmatchnonzero;
tmp = tree->lnode;
rp = re_update(tmp);
tree = tree->rnode;
s = tree->lnode;
tree = tree->rnode;
tmp = tree->lnode;
t = force_string(tree_eval(tmp));
/* do the search early to avoid work on non-match */
if (research(rp, t->stptr, 0, t->stlen, TRUE) == -1 ||
RESTART(rp, t->stptr) > t->stlen) {
free_temp(t);
return tmp_number((AWKNUM) 0.0);
}
if (tmp->type == Node_val)
lhs = NULL;
else
lhs = get_lhs(tmp, &after_assign);
t->flags |= STRING;
/*
* create a private copy of the string
*/
if (t->stref > 1 || (t->flags & (PERM|FIELD)) != 0) {
unsigned int saveflags;
saveflags = t->flags;
t->flags &= ~MALLOC;
tmp = dupnode(t);
t->flags = saveflags;
t = tmp;
priv = TRUE;
}
text = t->stptr;
textlen = t->stlen;
buflen = textlen + 2;
s = force_string(tree_eval(s));
repl = s->stptr;
replend = repl + s->stlen;
repllen = replend - repl;
emalloc(buf, char *, buflen + 2, "sub_common");
buf[buflen] = '\0';
buf[buflen + 1] = '\0';
ampersands = 0;
for (scan = repl; scan < replend; scan++) {
if (*scan == '&') {
repllen--;
ampersands++;
} else if (*scan == '\\') {
if (backdigs) { /* gensub, behave sanely */
if (ISDIGIT(scan[1])) {
ampersands++;
scan++;
} else { /* \q for any q --> q */
repllen--;
scan++;
}
} else { /* (proposed) posix '96 mode */
if (strncmp(scan, "\\\\\\&", 4) == 0) {
/* \\\& --> \& */
repllen -= 2;
scan += 3;
} else if (strncmp(scan, "\\\\&", 3) == 0) {
/* \\& --> \<string> */
ampersands++;
repllen--;
scan += 2;
} else if (scan[1] == '&') {
/* \& --> & */
repllen--;
scan++;
} /* else
leave alone, it goes into the output */
}
}
}
lastmatchnonzero = FALSE;
bp = buf;
for (current = 1;; current++) {
matches++;
matchstart = t->stptr + RESTART(rp, t->stptr);
matchend = t->stptr + REEND(rp, t->stptr);
/*
* create the result, copying in parts of the original
* string
*/
len = matchstart - text + repllen
+ ampersands * (matchend - matchstart);
sofar = bp - buf;
while (buflen < (sofar + len + 1)) {
buflen *= 2;
erealloc(buf, char *, buflen, "sub_common");
bp = buf + sofar;
}
for (scan = text; scan < matchstart; scan++)
*bp++ = *scan;
if (global || current == how_many) {
/*
* If the current match matched the null string,
* and the last match didn't and did a replacement,
* then skip this one.
*/
if (lastmatchnonzero && matchstart == matchend) {
lastmatchnonzero = FALSE;
goto empty;
}
/*
* If replacing all occurrences, or this is the
* match we want, copy in the replacement text,
* making substitutions as we go.
*/
for (scan = repl; scan < replend; scan++)
if (*scan == '&')
for (cp = matchstart; cp < matchend; cp++)
*bp++ = *cp;
else if (*scan == '\\') {
if (backdigs) { /* gensub, behave sanely */
if (ISDIGIT(scan[1])) {
int dig = scan[1] - '0';
char *start, *end;
start = t->stptr
+ SUBPATSTART(rp, t->stptr, dig);
end = t->stptr
+ SUBPATEND(rp, t->stptr, dig);
for (cp = start; cp < end; cp++)
*bp++ = *cp;
scan++;
} else /* \q for any q --> q */
*bp++ = *++scan;
} else { /* posix '96 mode, bleah */
if (strncmp(scan, "\\\\\\&", 4) == 0) {
/* \\\& --> \& */
*bp++ = '\\';
*bp++ = '&';
scan += 3;
} else if (strncmp(scan, "\\\\&", 3) == 0) {
/* \\& --> \<string> */
*bp++ = '\\';
for (cp = matchstart; cp < matchend; cp++)
*bp++ = *cp;
scan += 2;
} else if (scan[1] == '&') {
/* \& --> & */
*bp++ = '&';
scan++;
} else
*bp++ = *scan;
}
} else
*bp++ = *scan;
if (matchstart != matchend)
lastmatchnonzero = TRUE;
} else {
/*
* don't want this match, skip over it by copying
* in current text.
*/
for (cp = matchstart; cp < matchend; cp++)
*bp++ = *cp;
}
empty:
/* catch the case of gsub(//, "blah", whatever), i.e. empty regexp */
if (matchstart == matchend && matchend < text + textlen) {
*bp++ = *matchend;
matchend++;
}
textlen = text + textlen - matchend;
text = matchend;
if ((current >= how_many && !global)
|| ((long) textlen <= 0 && matchstart == matchend)
|| research(rp, t->stptr, text - t->stptr, textlen, TRUE) == -1)
break;
}
sofar = bp - buf;
if (buflen - sofar - textlen - 1) {
buflen = sofar + textlen + 2;
erealloc(buf, char *, buflen, "sub_common");
bp = buf + sofar;
}
for (scan = matchend; scan < text + textlen; scan++)
*bp++ = *scan;
*bp = '\0';
textlen = bp - buf;
free(t->stptr);
t->stptr = buf;
t->stlen = textlen;
free_temp(s);
if (matches > 0 && lhs) {
if (priv) {
unref(*lhs);
*lhs = t;
}
if (after_assign != NULL)
(*after_assign)();
t->flags &= ~(NUM|NUMBER);
}
return tmp_number((AWKNUM) matches);
}
/* do_gsub --- global substitution */
NODE *
do_gsub(tree)
NODE *tree;
{
return sub_common(tree, -1, FALSE);
}
/* do_sub --- single substitution */
NODE *
do_sub(tree)
NODE *tree;
{
return sub_common(tree, 1, FALSE);
}
/* do_gensub --- fix up the tree for sub_common for the gensub function */
NODE *
do_gensub(tree)
NODE *tree;
{
NODE n1, n2, n3, *t, *tmp, *target, *ret;
long how_many = 1; /* default is one substitution */
double d;
/*
* We have to pull out the value of the global flag, and
* build up a tree without the flag in it, turning it into the
* kind of tree that sub_common() expects. It helps to draw
* a picture of this ...
*/
n1 = *tree;
n2 = *(tree->rnode);
n1.rnode = & n2;
t = tree_eval(n2.rnode->lnode); /* value of global flag */
tmp = force_string(tree_eval(n2.rnode->rnode->lnode)); /* target */
/*
* We make copy of the original target string, and pass that
* in to sub_common() as the target to make the substitution in.
* We will then return the result string as the return value of
* this function.
*/
target = make_string(tmp->stptr, tmp->stlen);
free_temp(tmp);
n3 = *(n2.rnode->rnode);
n3.lnode = target;
n2.rnode = & n3;
if ((t->flags & (STR|STRING)) != 0) {
if (t->stlen > 0 && (t->stptr[0] == 'g' || t->stptr[0] == 'G'))
how_many = -1;
else
how_many = 1;
} else {
d = force_number(t);
if (d > 0)
how_many = d;
else
how_many = 1;
}
free_temp(t);
ret = sub_common(&n1, how_many, TRUE);
free_temp(ret);
/*
* Note that we don't care what sub_common() returns, since the
* easiest thing for the programmer is to return the string, even
* if no substitutions were done.
*/
target->flags |= TEMP;
return target;
}
#ifdef GFMT_WORKAROUND
/*
* printf's %g format [can't rely on gcvt()]
* caveat: don't use as argument to *printf()!
* 'format' string HAS to be of "<flags>*.*g" kind, or we bomb!
*/
static void
sgfmt(buf, format, alt, fwidth, prec, g)
char *buf; /* return buffer; assumed big enough to hold result */
const char *format;
int alt; /* use alternate form flag */
int fwidth; /* field width in a format */
int prec; /* indicates desired significant digits, not decimal places */
double g; /* value to format */
{
char dform[40];
register char *gpos;
register char *d, *e, *p;
int again = FALSE;
strncpy(dform, format, sizeof dform - 1);
dform[sizeof dform - 1] = '\0';
gpos = strrchr(dform, '.');
if (g == 0.0 && ! alt) { /* easy special case */
*gpos++ = 'd';
*gpos = '\0';
(void) sprintf(buf, dform, fwidth, 0);
return;
}
/* advance to location of 'g' in the format */
while (*gpos && *gpos != 'g' && *gpos != 'G')
gpos++;
if (prec <= 0) /* negative precision is ignored */
prec = (prec < 0 ? DEFAULT_G_PRECISION : 1);
if (*gpos == 'G')
again = TRUE;
/* start with 'e' format (it'll provide nice exponent) */
*gpos = 'e';
prec--;
(void) sprintf(buf, dform, fwidth, prec, g);
if ((e = strrchr(buf, 'e')) != NULL) { /* find exponent */
int expn = atoi(e+1); /* fetch exponent */
if (expn >= -4 && expn <= prec) { /* per K&R2, B1.2 */
/* switch to 'f' format and re-do */
*gpos = 'f';
prec -= expn; /* decimal precision */
(void) sprintf(buf, dform, fwidth, prec, g);
e = buf + strlen(buf);
while (*--e == ' ')
continue;
e++;
}
else if (again)
*gpos = 'E';
/* if 'alt' in force, then trailing zeros are not removed */
if (! alt && (d = strrchr(buf, '.')) != NULL) {
/* throw away an excess of precision */
for (p = e; p > d && *--p == '0'; )
prec--;
if (d == p)
prec--;
if (prec < 0)
prec = 0;
/* and do that once again */
again = TRUE;
}
if (again)
(void) sprintf(buf, dform, fwidth, prec, g);
}
}
#endif /* GFMT_WORKAROUND */
#ifdef BITOPS
#define BITS_PER_BYTE 8 /* if not true, you lose. too bad. */
/* do_lshift --- perform a << operation */
NODE *
do_lshift(tree)
NODE *tree;
{
NODE *s1, *s2;
unsigned long uval, ushift, result;
AWKNUM val, shift;
s1 = tree_eval(tree->lnode);
s2 = tree_eval(tree->rnode->lnode);
val = force_number(s1);
shift = force_number(s2);
free_temp(s1);
free_temp(s2);
if (do_lint) {
if (val < 0 || shift < 0)
warning("lshift(%lf, %lf): negative values will give strange results", val, shift);
if (double_to_int(val) != val || double_to_int(shift) != shift)
warning("lshift(%lf, %lf): fractional values will be truncated", val, shift);
if (shift > (sizeof(unsigned long) * BITS_PER_BYTE))
warning("lshift(%lf, %lf): too large shift value will give strange results", val, shift);
}
uval = (unsigned long) val;
ushift = (unsigned long) shift;
result = uval << ushift;
return tmp_number((AWKNUM) result);
}
/* do_rshift --- perform a >> operation */
NODE *
do_rshift(tree)
NODE *tree;
{
NODE *s1, *s2;
unsigned long uval, ushift, result;
AWKNUM val, shift;
s1 = tree_eval(tree->lnode);
s2 = tree_eval(tree->rnode->lnode);
val = force_number(s1);
shift = force_number(s2);
free_temp(s1);
free_temp(s2);
if (do_lint) {
if (val < 0 || shift < 0)
warning("rshift(%lf, %lf): negative values will give strange results", val, shift);
if (double_to_int(val) != val || double_to_int(shift) != shift)
warning("rshift(%lf, %lf): fractional values will be truncated", val, shift);
if (shift > (sizeof(unsigned long) * BITS_PER_BYTE))
warning("rshift(%lf, %lf): too large shift value will give strange results", val, shift);
}
uval = (unsigned long) val;
ushift = (unsigned long) shift;
result = uval >> ushift;
return tmp_number((AWKNUM) result);
}
/* do_and --- perform an & operation */
NODE *
do_and(tree)
NODE *tree;
{
NODE *s1, *s2;
unsigned long uleft, uright, result;
AWKNUM left, right;
s1 = tree_eval(tree->lnode);
s2 = tree_eval(tree->rnode->lnode);
left = force_number(s1);
right = force_number(s2);
free_temp(s1);
free_temp(s2);
if (do_lint) {
if (left < 0 || right < 0)
warning("and(%lf, %lf): negative values will give strange results", left, right);
if (double_to_int(left) != left || double_to_int(right) != right)
warning("and(%lf, %lf): fractional values will be truncated", left, right);
}
uleft = (unsigned long) left;
uright = (unsigned long) right;
result = uleft & uright;
return tmp_number((AWKNUM) result);
}
/* do_or --- perform an | operation */
NODE *
do_or(tree)
NODE *tree;
{
NODE *s1, *s2;
unsigned long uleft, uright, result;
AWKNUM left, right;
s1 = tree_eval(tree->lnode);
s2 = tree_eval(tree->rnode->lnode);
left = force_number(s1);
right = force_number(s2);
free_temp(s1);
free_temp(s2);
if (do_lint) {
if (left < 0 || right < 0)
warning("or(%lf, %lf): negative values will give strange results", left, right);
if (double_to_int(left) != left || double_to_int(right) != right)
warning("or(%lf, %lf): fractional values will be truncated", left, right);
}
uleft = (unsigned long) left;
uright = (unsigned long) right;
result = uleft | uright;
return tmp_number((AWKNUM) result);
}
/* do_xor --- perform an ^ operation */
NODE *
do_xor(tree)
NODE *tree;
{
NODE *s1, *s2;
unsigned long uleft, uright, result;
AWKNUM left, right;
s1 = tree_eval(tree->lnode);
s2 = tree_eval(tree->rnode->lnode);
left = force_number(s1);
right = force_number(s2);
free_temp(s1);
free_temp(s2);
if (do_lint) {
if (left < 0 || right < 0)
warning("xor(%lf, %lf): negative values will give strange results", left, right);
if (double_to_int(left) != left || double_to_int(right) != right)
warning("xor(%lf, %lf): fractional values will be truncated", left, right);
}
uleft = (unsigned long) left;
uright = (unsigned long) right;
result = uleft ^ uright;
return tmp_number((AWKNUM) result);
}
/* do_compl --- perform a ~ operation */
NODE *
do_compl(tree)
NODE *tree;
{
NODE *tmp;
double d;
unsigned long uval;
tmp = tree_eval(tree->lnode);
d = force_number(tmp);
free_temp(tmp);
if (do_lint) {
if (uval < 0)
warning("compl(%lf): negative value will give strange results", d);
if (double_to_int(d) != d)
warning("compl(%lf): fractional value will be truncated", d);
}
uval = (unsigned long) d;
uval = ~ uval;
return tmp_number((AWKNUM) uval);
}
/* do_strtonum --- the strtonum function */
NODE *
do_strtonum(tree)
NODE *tree;
{
NODE *tmp;
double d, arg;
tmp = tree_eval(tree->lnode);
if ((tmp->flags & (NUM|NUMBER)) != 0)
d = (double) force_number(tmp);
else if (isnondecimal(tmp->stptr))
d = nondec2awknum(tmp->stptr, tmp->stlen);
else
d = (double) force_number(tmp);
free_temp(tmp);
return tmp_number((AWKNUM) d);
}
#endif /* BITOPS */
#if defined(BITOPS) || defined(NONDECDATA)
/* nondec2awknum --- convert octal or hex value to double */
/*
* Because of awk's concatenation rules and the way awk.y:yylex()
* collects a number, this routine has to be willing to stop on the
* first invalid character.
*/
AWKNUM
nondec2awknum(str, len)
char *str;
size_t len;
{
AWKNUM retval = 0.0;
char save;
short val;
if (*str == '0' && (str[1] == 'x' || str[1] == 'X')) {
assert(len > 2);
for (str += 2, len -= 2; len > 0; len--, str++) {
switch (*str) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
val = *str - '0';
break;
case 'a':
case 'b':
case 'c':
case 'd':
case 'e':
val = *str - 'a' + 10;
break;
case 'A':
case 'B':
case 'C':
case 'D':
case 'E':
val = *str - 'A' + 10;
break;
default:
goto done;
}
retval = (retval * 16) + val;
}
} else if (*str == '0') {
for (; len > 0; len--) {
if (! isdigit(*str) || *str == '8' || *str == '9')
goto done;
retval = (retval * 8) + (*str - '0');
str++;
}
} else {
save = str[len];
retval = atof(str);
str[len] = save;
}
done:
return retval;
}
#endif /* defined(BITOPS) || defined(NONDECDATA) */
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