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NetBSD/gnu/usr.bin/gawk/builtin.c

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/*
* builtin.c - Builtin functions and various utility procedures
*/
/*
* Copyright (C) 1986, 1988, 1989, 1991-1995 the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Progamming 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 GAWK; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "awk.h"
#ifndef SRANDOM_PROTO
extern void srandom P((unsigned int seed));
#endif
#if defined(RANDOM_MISSING)
extern char *initstate P((unsigned seed, char *state, int n));
extern char *setstate P((char *state));
extern long random P((void));
#endif
extern NODE **fields_arr;
extern int output_is_tty;
static NODE *sub_common P((NODE *tree, int global));
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 */
/*
* On the alpha, LONG_MAX is too big for doing rand().
* On the Cray (Y-MP, anyway), ints and longs are 64 bits, but
* random() does things in terms of 32 bits. So we have to chop
* LONG_MAX down.
*/
#if (defined(__alpha) && defined(__osf__)) || defined(_CRAY)
#define GAWK_RANDOM_MAX (LONG_MAX & 0x7fffffff)
#else
#define GAWK_RANDOM_MAX LONG_MAX
#endif
static void efwrite P((const void *ptr, size_t size, size_t count, FILE *fp,
const char *from, struct redirect *rp,int flush));
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");
}
/* Builtin functions */
NODE *
do_exp(tree)
NODE *tree;
{
NODE *tmp;
double d, res;
#ifndef exp
double exp P((double));
#endif
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);
}
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;
if (IGNORECASE) {
while (l1) {
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) {
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
double_to_int(d)
double d;
{
double floor P((double));
double ceil P((double));
if (d >= 0)
d = Floor(d);
else
d = Ceil(d);
return d;
}
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);
}
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);
}
NODE *
do_log(tree)
NODE *tree;
{
NODE *tmp;
#ifndef log
double log P((double));
#endif
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) { toofew = 1; break; }\
else {\
arg=tree_eval(carg->lnode);\
carg=carg->rnode;\
}\
}
NODE *r;
int toofew = 0;
char *obuf, *obufout;
size_t osiz, ofre;
char *chbuf;
const char *s0, *s1;
int cs1;
NODE *arg;
long fw, prec;
int lj, alt, big, have_prec;
long *cur;
long val;
#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 = 0;
size_t len;
static char sp[] = " ";
static char zero_string[] = "0";
static char lchbuf[] = "0123456789abcdef";
static char Uchbuf[] = "0123456789ABCDEF";
emalloc(obuf, char *, 120, "format_tree");
obufout = obuf;
osiz = 120;
ofre = osiz - 1;
s0 = s1 = fmt_string;
while (n0-- > 0) {
if (*s1 != '%') {
s1++;
continue;
}
bchunk(s0, s1 - s0);
s0 = s1;
cur = &fw;
fw = 0;
prec = 0;
have_prec = 0;
lj = alt = big = 0;
fill = sp;
cp = cend;
chbuf = lchbuf;
s1++;
retry:
--n0;
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 '%':
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 == 0)
/* goto lose; */
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 = 0;
if (cur == &prec)
cur = 0;
goto retry;
case '*':
if (cur == 0)
/* goto lose; */
break;
parse_next_arg();
*cur = force_number(arg);
free_temp(arg);
if (cur == &prec)
cur = 0;
goto retry;
case ' ': /* print ' ' or '-' */
/* 'space' flag is ignored */
/* if '+' already present */
if (signchar != 0)
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++;
goto retry;
case '#':
alt++;
goto check_pos;
case 'l':
if (big)
break;
else {
static int warned = 0;
if (do_lint && ! warned) {
warning("`l' is meaningless in awk formats; ignored");
warned++;
}
if (do_posix)
fatal("'l' is not permitted in POSIX awk formats");
}
big++;
goto retry;
case 'c':
parse_next_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 == 0)
prec = 1;
else if (prec > arg->stlen)
prec = arg->stlen;
cp = arg->stptr;
goto pr_tail;
case 's':
parse_next_arg();
arg = force_string(arg);
if (have_prec == 0 || prec > arg->stlen)
prec = arg->stlen;
cp = arg->stptr;
goto pr_tail;
case 'd':
case 'i':
parse_next_arg();
tmpval = force_number(arg);
if (tmpval > LONG_MAX || tmpval < LONG_MIN) {
/* out of range - emergency use of %g format */
cs1 = 'g';
goto format_float;
}
val = (long) tmpval;
if (val < 0) {
sgn = 1;
if (val > LONG_MIN)
uval = (unsigned long) -val;
else
uval = (unsigned long)(-(LONG_MIN + 1))
+ (unsigned long)1;
} else {
sgn = 0;
uval = (unsigned long) val;
}
do {
*--cp = (char) ('0' + uval % 10);
uval /= 10;
} while (uval);
if (sgn)
*--cp = '-';
else if (signchar)
*--cp = signchar;
if (have_prec != 0) /* ignore '0' flag if */
fill = sp; /* precision given */
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;
parse_next_arg();
tmpval = force_number(arg);
if (tmpval > ULONG_MAX || tmpval < LONG_MIN) {
/* out of range - emergency use of %g format */
cs1 = 'g';
goto format_float;
}
uval = (unsigned long)tmpval;
if (have_prec != 0) /* ignore '0' flag if */
fill = sp; /* precision given */
do {
*--cp = chbuf[uval % base];
uval /= base;
} while (uval);
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;
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;
case 'g':
case 'G':
case 'e':
case 'f':
case 'E':
parse_next_arg();
tmpval = force_number(arg);
format_float:
free_temp(arg);
if (have_prec == 0)
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 && 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;
}
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;
}
void
do_printf(tree)
register NODE *tree;
{
struct redirect *rp = NULL;
register FILE *fp;
if (tree->rnode) {
int errflg; /* not used, sigh */
rp = redirect(tree->rnode, &errflg);
if (rp) {
fp = rp->fp;
if (!fp)
return;
} else
return;
} else
fp = stdout;
tree = do_sprintf(tree->lnode);
efwrite(tree->stptr, sizeof(char), tree->stlen, fp, "printf", rp , 1);
free_temp(tree);
}
NODE *
do_sqrt(tree)
NODE *tree;
{
NODE *tmp;
double arg;
extern double sqrt P((double));
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));
}
NODE *
do_substr(tree)
NODE *tree;
{
NODE *t1, *t2, *t3;
NODE *r;
register int indx;
size_t length;
int is_long;
t1 = tree_eval(tree->lnode);
t2 = tree_eval(tree->rnode->lnode);
if (tree->rnode->rnode == NULL) /* third arg. missing */
length = t1->stlen;
else {
t3 = tree_eval(tree->rnode->rnode->lnode);
length = (size_t) force_number(t3);
free_temp(t3);
}
indx = (int) force_number(t2) - 1;
free_temp(t2);
t1 = force_string(t1);
if (indx < 0)
indx = 0;
if (indx >= t1->stlen || (long) length <= 0) {
free_temp(t1);
return Nnull_string;
}
if ((is_long = (indx + length > t1->stlen)) || LONG_MAX - indx < length) {
length = t1->stlen - indx;
if (do_lint && is_long)
warning("substr: length %d at position %d exceeds length of first argument",
length, indx+1);
}
r = tmp_string(t1->stptr + indx, length);
free_temp(t1);
return r;
}
NODE *
do_strftime(tree)
NODE *tree;
{
NODE *t1, *t2;
struct tm *tm;
time_t fclock;
char buf[100];
t1 = force_string(tree_eval(tree->lnode));
if (tree->rnode == NULL) /* second arg. missing, default */
(void) time(&fclock);
else {
t2 = tree_eval(tree->rnode->lnode);
fclock = (time_t) force_number(t2);
free_temp(t2);
}
tm = localtime(&fclock);
return tmp_string(buf, strftime(buf, 100, t1->stptr, tm));
}
NODE *
do_systime(tree)
NODE *tree;
{
time_t lclock;
(void) time(&lclock);
return tmp_number((AWKNUM) lclock);
}
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 <emory!cs.dal.ca!david>
* 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 */
void
do_print(tree)
register NODE *tree;
{
register NODE *t1;
struct redirect *rp = NULL;
register FILE *fp;
register char *s;
if (tree->rnode) {
int errflg; /* not used, sigh */
rp = redirect(tree->rnode, &errflg);
if (rp) {
fp = rp->fp;
if (!fp)
return;
} else
return;
} else
fp = stdout;
tree = tree->lnode;
while (tree) {
t1 = tree_eval(tree->lnode);
if (t1->flags & NUMBER) {
if (OFMTidx == CONVFMTidx)
(void) force_string(t1);
else {
#ifndef GFMT_WORKAROUND
char buf[100];
(void) sprintf(buf, OFMT, t1->numbr);
free_temp(t1);
t1 = tmp_string(buf, strlen(buf));
#else /* GFMT_WORKAROUND */
free_temp(t1);
t1 = format_tree(OFMT,
fmt_list[OFMTidx]->stlen,
tree);
#endif /* GFMT_WORKAROUND */
}
}
efwrite(t1->stptr, sizeof(char), t1->stlen, fp, "print", rp, 0);
free_temp(t1);
tree = tree->rnode;
if (tree) {
s = OFS;
if (OFSlen)
efwrite(s, sizeof(char), (size_t)OFSlen,
fp, "print", rp, 0);
}
}
s = ORS;
if (ORSlen)
efwrite(s, sizeof(char), (size_t)ORSlen, fp, "print", rp, 1);
}
NODE *
do_tolower(tree)
NODE *tree;
{
NODE *t1, *t2;
register char *cp, *cp2;
t1 = tree_eval(tree->lnode);
t1 = force_string(t1);
t2 = tmp_string(t1->stptr, t1->stlen);
for (cp = t2->stptr, cp2 = t2->stptr + t2->stlen; cp < cp2; cp++)
if (isupper(*cp))
*cp = tolower(*cp);
free_temp(t1);
return t2;
}
NODE *
do_toupper(tree)
NODE *tree;
{
NODE *t1, *t2;
register char *cp;
t1 = tree_eval(tree->lnode);
t1 = force_string(t1);
t2 = tmp_string(t1->stptr, t1->stlen);
for (cp = t2->stptr; cp < t2->stptr + t2->stlen; cp++)
if (islower(*cp))
*cp = toupper(*cp);
free_temp(t1);
return t2;
}
NODE *
do_atan2(tree)
NODE *tree;
{
NODE *t1, *t2;
extern double atan2 P((double, double));
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));
}
NODE *
do_sin(tree)
NODE *tree;
{
NODE *tmp;
extern double sin P((double));
double d;
tmp = tree_eval(tree->lnode);
d = sin((double)force_number(tmp));
free_temp(tmp);
return tmp_number((AWKNUM) d);
}
NODE *
do_cos(tree)
NODE *tree;
{
NODE *tmp;
extern double cos P((double));
double d;
tmp = tree_eval(tree->lnode);
d = cos((double)force_number(tmp));
free_temp(tmp);
return tmp_number((AWKNUM) d);
}
static int firstrand = 1;
static char state[512];
/* ARGSUSED */
NODE *
do_rand(tree)
NODE *tree;
{
if (firstrand) {
(void) initstate((unsigned) 1, state, sizeof state);
srandom(1);
firstrand = 0;
}
return tmp_number((AWKNUM) random() / GAWK_RANDOM_MAX);
}
NODE *
do_srand(tree)
NODE *tree;
{
NODE *tmp;
static long save_seed = 0;
long ret = save_seed; /* SVR4 awk srand returns previous seed */
if (firstrand)
(void) initstate((unsigned) 1, state, sizeof state);
else
(void) setstate(state);
if (!tree)
srandom((unsigned int) (save_seed = (long) time((time_t *) 0)));
else {
tmp = tree_eval(tree->lnode);
srandom((unsigned int) (save_seed = (long) force_number(tmp)));
free_temp(tmp);
}
firstrand = 0;
return tmp_number((AWKNUM) ret);
}
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, 1);
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);
}
static NODE *
sub_common(tree, global)
NODE *tree;
int global;
{
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 = 0;
Func_ptr after_assign = NULL;
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, 1) == -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)) {
unsigned int saveflags;
saveflags = t->flags;
t->flags &= ~MALLOC;
tmp = dupnode(t);
t->flags = saveflags;
t = tmp;
priv = 1;
}
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, "do_sub");
buf[buflen] = '\0';
buf[buflen + 1] = '\0';
ampersands = 0;
for (scan = repl; scan < replend; scan++) {
if (*scan == '&') {
repllen--;
ampersands++;
} else if (*scan == '\\'
&& (*(scan+1) == '&' || *(scan+1) == '\\')) {
repllen--;
scan++;
}
}
bp = buf;
for (;;) {
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, "do_sub");
bp = buf + sofar;
}
for (scan = text; scan < matchstart; scan++)
*bp++ = *scan;
for (scan = repl; scan < replend; scan++)
if (*scan == '&')
for (cp = matchstart; cp < matchend; cp++)
*bp++ = *cp;
else if (*scan == '\\'
&& (*(scan+1) == '&' || *(scan+1) == '\\')) {
scan++;
*bp++ = *scan;
} else
*bp++ = *scan;
/* catch the case of gsub(//, "blah", whatever), i.e. empty regexp */
if (global && matchstart == matchend && matchend < text + textlen) {
*bp++ = *matchend;
matchend++;
}
textlen = text + textlen - matchend;
text = matchend;
if (!global || (long)textlen <= 0 ||
research(rp, t->stptr, text-t->stptr, textlen, 1) == -1)
break;
}
sofar = bp - buf;
if (buflen - sofar - textlen - 1) {
buflen = sofar + textlen + 2;
erealloc(buf, char *, buflen, "do_sub");
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)
(*after_assign)();
t->flags &= ~(NUM|NUMBER);
}
return tmp_number((AWKNUM) matches);
}
NODE *
do_gsub(tree)
NODE *tree;
{
return sub_common(tree, 1);
}
NODE *
do_sub(tree)
NODE *tree;
{
return sub_common(tree, 0);
}
#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 = 0;
strncpy(dform, format, sizeof dform - 1);
dform[sizeof dform - 1] = '\0';
gpos = strrchr(dform, '.');
if (g == 0.0 && alt == 0) { /* easy special case */
*gpos++ = 'd';
*gpos = '\0';
(void) sprintf(buf, dform, fwidth, 0);
return;
}
gpos += 2; /* advance to location of 'g' in the format */
if (prec <= 0) /* negative precision is ignored */
prec = (prec < 0 ? DEFAULT_G_PRECISION : 1);
if (*gpos == 'G')
again = 1;
/* start with 'e' format (it'll provide nice exponent) */
*gpos = 'e';
prec -= 1;
(void) sprintf(buf, dform, fwidth, prec, g);
if ((e = strrchr(buf, 'e')) != NULL) { /* find exponent */
int exp = atoi(e+1); /* fetch exponent */
if (exp >= -4 && exp <= prec) { /* per K&R2, B1.2 */
/* switch to 'f' format and re-do */
*gpos = 'f';
prec -= exp; /* decimal precision */
(void) sprintf(buf, dform, fwidth, prec, g);
e = buf + strlen(buf);
while (*--e == ' ')
continue;
e += 1;
}
else if (again != 0)
*gpos = 'E';
/* if 'alt' in force, then trailing zeros are not removed */
if (alt == 0 && (d = strrchr(buf, '.')) != NULL) {
/* throw away an excess of precision */
for (p = e; p > d && *--p == '0'; )
prec -= 1;
if (d == p)
prec -= 1;
if (prec < 0)
prec = 0;
/* and do that once again */
again = 1;
}
if (again != 0)
(void) sprintf(buf, dform, fwidth, prec, g);
}
}
#endif /* GFMT_WORKAROUND */
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