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field.c
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/*
* field.c - routines for dealing with fields and record parsing
*/
/*
* Copyright (C) 1986, 1988, 1989, 1991-2011 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 3 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "awk.h"
/*
* In case that the system doesn't have isblank().
* Don't bother with autoconf ifdef junk, just force it.
* See dfa.c and regex_internal.h and regcomp.c. Bleah.
*/
static int
is_blank(int c)
{
return c == ' ' || c == '\t';
}
typedef void (* Setfunc)(long, char *, long, NODE *);
static long (*parse_field)(long, char **, int, NODE *,
Regexp *, Setfunc, NODE *, NODE *, bool);
static void rebuild_record(void);
static long re_parse_field(long, char **, int, NODE *,
Regexp *, Setfunc, NODE *, NODE *, bool);
static long def_parse_field(long, char **, int, NODE *,
Regexp *, Setfunc, NODE *, NODE *, bool);
static long posix_def_parse_field(long, char **, int, NODE *,
Regexp *, Setfunc, NODE *, NODE *, bool);
static long null_parse_field(long, char **, int, NODE *,
Regexp *, Setfunc, NODE *, NODE *, bool);
static long sc_parse_field(long, char **, int, NODE *,
Regexp *, Setfunc, NODE *, NODE *, bool);
static long fw_parse_field(long, char **, int, NODE *,
Regexp *, Setfunc, NODE *, NODE *, bool);
static long fpat_parse_field(long, char **, int, NODE *,
Regexp *, Setfunc, NODE *, NODE *, bool);
static void set_element(long num, char * str, long len, NODE *arr);
static void grow_fields_arr(long num);
static void set_field(long num, char *str, long len, NODE *dummy);
static char *parse_extent; /* marks where to restart parse of record */
static long parse_high_water = 0; /* field number that we have parsed so far */
static long nf_high_water = 0; /* size of fields_arr */
static bool resave_fs;
static NODE *save_FS; /* save current value of FS when line is read,
* to be used in deferred parsing
*/
static int *FIELDWIDTHS = NULL;
NODE **fields_arr; /* array of pointers to the field nodes */
bool field0_valid; /* $(>0) has not been changed yet */
int default_FS; /* true when FS == " " */
Regexp *FS_re_yes_case = NULL;
Regexp *FS_re_no_case = NULL;
Regexp *FS_regexp = NULL;
Regexp *FPAT_re_yes_case = NULL;
Regexp *FPAT_re_no_case = NULL;
Regexp *FPAT_regexp = NULL;
NODE *Null_field = NULL;
/* init_fields --- set up the fields array to start with */
void
init_fields()
{
emalloc(fields_arr, NODE **, sizeof(NODE *), "init_fields");
fields_arr[0] = dupnode(Nnull_string);
parse_extent = fields_arr[0]->stptr;
save_FS = dupnode(FS_node->var_value);
getnode(Null_field);
*Null_field = *Nnull_string;
Null_field->valref = 1;
Null_field->flags = (FIELD|STRCUR|STRING);
field0_valid = true;
}
/* grow_fields --- acquire new fields as needed */
static void
grow_fields_arr(long num)
{
int t;
NODE *n;
erealloc(fields_arr, NODE **, (num + 1) * sizeof(NODE *), "grow_fields_arr");
for (t = nf_high_water + 1; t <= num; t++) {
getnode(n);
*n = *Null_field;
fields_arr[t] = n;
}
nf_high_water = num;
}
/* set_field --- set the value of a particular field */
/*ARGSUSED*/
static void
set_field(long num,
char *str,
long len,
NODE *dummy ATTRIBUTE_UNUSED) /* just to make interface same as set_element */
{
NODE *n;
if (num > nf_high_water)
grow_fields_arr(num);
n = fields_arr[num];
n->stptr = str;
n->stlen = len;
n->flags = (STRCUR|STRING|MAYBE_NUM|FIELD);
}
/* rebuild_record --- Someone assigned a value to $(something).
Fix up $0 to be right */
static void
rebuild_record()
{
/*
* use explicit unsigned longs for lengths, in case
* a size_t isn't big enough.
*/
unsigned long tlen;
unsigned long ofslen;
NODE *tmp;
NODE *ofs;
char *ops;
char *cops;
long i;
assert(NF != -1);
tlen = 0;
ofs = force_string(OFS_node->var_value);
ofslen = ofs->stlen;
for (i = NF; i > 0; i--) {
tmp = fields_arr[i];
tmp = force_string(tmp);
tlen += tmp->stlen;
}
tlen += (NF - 1) * ofslen;
if ((long) tlen < 0)
tlen = 0;
emalloc(ops, char *, tlen + 2, "rebuild_record");
cops = ops;
ops[0] = '\0';
for (i = 1; i <= NF; i++) {
free_wstr(fields_arr[i]);
tmp = fields_arr[i];
/* copy field */
if (tmp->stlen == 1)
*cops++ = tmp->stptr[0];
else if (tmp->stlen != 0) {
memcpy(cops, tmp->stptr, tmp->stlen);
cops += tmp->stlen;
}
/* copy OFS */
if (i != NF) {
if (ofslen == 1)
*cops++ = ofs->stptr[0];
else if (ofslen != 0) {
memcpy(cops, ofs->stptr, ofslen);
cops += ofslen;
}
}
}
tmp = make_str_node(ops, tlen, ALREADY_MALLOCED);
/*
* Since we are about to unref fields_arr[0], we want to find
* any fields that still point into it, and have them point
* into the new field zero. This has to be done intelligently,
* so that unrefing a field doesn't try to unref into the old $0.
*/
for (cops = ops, i = 1; i <= NF; i++) {
NODE *r = fields_arr[i];
if (r->stlen > 0) {
NODE *n;
getnode(n);
if ((r->flags & FIELD) == 0) {
*n = *Null_field;
n->stlen = r->stlen;
if ((r->flags & (NUMCUR|NUMBER)) != 0) {
n->flags |= (r->flags & (MPFN|MPZN|NUMCUR|NUMBER));
#ifdef HAVE_MPFR
if (is_mpg_float(r)) {
mpfr_init(n->mpg_numbr);
mpfr_set(n->mpg_numbr, r->mpg_numbr, ROUND_MODE);
} else if (is_mpg_integer(r)) {
mpz_init(n->mpg_i);
mpz_set(n->mpg_i, r->mpg_i);
} else
#endif
n->numbr = r->numbr;
}
} else {
*n = *r;
n->flags &= ~(MALLOC|STRING);
}
n->stptr = cops;
unref(r);
fields_arr[i] = n;
assert((n->flags & WSTRCUR) == 0);
}
cops += fields_arr[i]->stlen + ofslen;
}
unref(fields_arr[0]);
fields_arr[0] = tmp;
field0_valid = true;
}
/*
* set_record:
* setup $0, but defer parsing rest of line until reference is made to $(>0)
* or to NF. At that point, parse only as much as necessary.
*
* Manage a private buffer for the contents of $0. Doing so keeps us safe
* if `getline var' decides to rearrange the contents of the IOBUF that
* $0 might have been pointing into. The cost is the copying of the buffer;
* but better correct than fast.
*/
void
set_record(const char *buf, int cnt)
{
NODE *n;
static char *databuf;
static unsigned long databuf_size;
#define INITIAL_SIZE 512
#define MAX_SIZE ((unsigned long) ~0) /* maximally portable ... */
reset_record();
/* buffer management: */
if (databuf_size == 0) { /* first time */
emalloc(databuf, char *, INITIAL_SIZE, "set_record");
databuf_size = INITIAL_SIZE;
memset(databuf, '\0', INITIAL_SIZE);
}
/*
* Make sure there's enough room. Since we sometimes need
* to place a sentinel at the end, we make sure
* databuf_size is > cnt after allocation.
*/
if (cnt >= databuf_size) {
while (cnt >= databuf_size && databuf_size <= MAX_SIZE)
databuf_size *= 2;
erealloc(databuf, char *, databuf_size, "set_record");
memset(databuf, '\0', databuf_size);
}
/* copy the data */
memcpy(databuf, buf, cnt);
/* manage field 0: */
unref(fields_arr[0]);
getnode(n);
n->stptr = databuf;
n->stlen = cnt;
n->valref = 1;
n->type = Node_val;
n->stfmt = -1;
n->flags = (STRING|STRCUR|MAYBE_NUM|FIELD);
fields_arr[0] = n;
#undef INITIAL_SIZE
#undef MAX_SIZE
}
/* reset_record --- start over again with current $0 */
void
reset_record()
{
int i;
NODE *n;
fields_arr[0] = force_string(fields_arr[0]);
NF = -1;
for (i = 1; i <= parse_high_water; i++) {
unref(fields_arr[i]);
getnode(n);
*n = *Null_field;
fields_arr[i] = n;
}
parse_high_water = 0;
/*
* $0 = $0 should resplit using the current value of FS.
*/
if (resave_fs) {
resave_fs = false;
unref(save_FS);
save_FS = dupnode(FS_node->var_value);
}
field0_valid = true;
}
/* set_NF --- handle what happens to $0 and fields when NF is changed */
void
set_NF()
{
int i;
long nf;
NODE *n;
assert(NF != -1);
(void) force_number(NF_node->var_value);
nf = get_number_si(NF_node->var_value);
if (nf < 0)
fatal(_("NF set to negative value"));
NF = nf;
if (NF > nf_high_water)
grow_fields_arr(NF);
if (parse_high_water < NF) {
for (i = parse_high_water + 1; i >= 0 && i <= NF; i++) {
unref(fields_arr[i]);
getnode(n);
*n = *Null_field;
fields_arr[i] = n;
}
} else if (parse_high_water > 0) {
for (i = NF + 1; i >= 0 && i <= parse_high_water; i++) {
unref(fields_arr[i]);
getnode(n);
*n = *Null_field;
fields_arr[i] = n;
}
parse_high_water = NF;
}
field0_valid = false;
}
/*
* re_parse_field --- parse fields using a regexp.
*
* This is called both from get_field() and from do_split()
* via (*parse_field)(). This variation is for when FS is a regular
* expression -- either user-defined or because RS=="" and FS==" "
*/
static long
re_parse_field(long up_to, /* parse only up to this field number */
char **buf, /* on input: string to parse; on output: point to start next */
int len,
NODE *fs ATTRIBUTE_UNUSED,
Regexp *rp,
Setfunc set, /* routine to set the value of the parsed field */
NODE *n,
NODE *sep_arr, /* array of field separators (maybe NULL) */
bool in_middle)
{
char *scan = *buf;
long nf = parse_high_water;
char *field;
char *end = scan + len;
int regex_flags = RE_NEED_START;
char *sep;
#if MBS_SUPPORT
size_t mbclen = 0;
mbstate_t mbs;
if (gawk_mb_cur_max > 1)
memset(&mbs, 0, sizeof(mbstate_t));
#endif
if (in_middle)
regex_flags |= RE_NO_BOL;
if (up_to == UNLIMITED)
nf = 0;
if (len == 0)
return nf;
if (RS_is_null && default_FS) {
sep = scan;
while (scan < end && (*scan == ' ' || *scan == '\t' || *scan == '\n'))
scan++;
if (sep_arr != NULL && sep < scan)
set_element(nf, sep, (long)(scan - sep), sep_arr);
}
if (rp == NULL) /* use FS */
rp = FS_regexp;
field = scan;
while (scan < end
&& research(rp, scan, 0, (end - scan), regex_flags) != -1
&& nf < up_to) {
regex_flags |= RE_NO_BOL;
if (REEND(rp, scan) == RESTART(rp, scan)) { /* null match */
#if MBS_SUPPORT
if (gawk_mb_cur_max > 1) {
mbclen = mbrlen(scan, end-scan, &mbs);
if ((mbclen == 1) || (mbclen == (size_t) -1)
|| (mbclen == (size_t) -2) || (mbclen == 0)) {
/* We treat it as a singlebyte character. */
mbclen = 1;
}
scan += mbclen;
} else
#endif
scan++;
if (scan == end) {
(*set)(++nf, field, (long)(scan - field), n);
up_to = nf;
break;
}
continue;
}
(*set)(++nf, field,
(long)(scan + RESTART(rp, scan) - field), n);
if (sep_arr != NULL)
set_element(nf, scan + RESTART(rp, scan),
(long) (REEND(rp, scan) - RESTART(rp, scan)), sep_arr);
scan += REEND(rp, scan);
field = scan;
if (scan == end) /* FS at end of record */
(*set)(++nf, field, 0L, n);
}
if (nf != up_to && scan < end) {
(*set)(++nf, scan, (long)(end - scan), n);
scan = end;
}
*buf = scan;
return nf;
}
/*
* def_parse_field --- default field parsing.
*
* This is called both from get_field() and from do_split()
* via (*parse_field)(). This variation is for when FS is a single space
* character.
*/
static long
def_parse_field(long up_to, /* parse only up to this field number */
char **buf, /* on input: string to parse; on output: point to start next */
int len,
NODE *fs,
Regexp *rp ATTRIBUTE_UNUSED,
Setfunc set, /* routine to set the value of the parsed field */
NODE *n,
NODE *sep_arr, /* array of field separators (maybe NULL) */
bool in_middle ATTRIBUTE_UNUSED)
{
char *scan = *buf;
long nf = parse_high_water;
char *field;
char *end = scan + len;
char sav;
char *sep;
if (up_to == UNLIMITED)
nf = 0;
if (len == 0)
return nf;
/*
* Nasty special case. If FS set to "", return whole record
* as first field. This is not worth a separate function.
*/
if (fs->stlen == 0) {
(*set)(++nf, *buf, len, n);
*buf += len;
return nf;
}
/* before doing anything save the char at *end */
sav = *end;
/* because it will be destroyed now: */
*end = ' '; /* sentinel character */
sep = scan;
for (; nf < up_to; scan++) {
/*
* special case: fs is single space, strip leading whitespace
*/
while (scan < end && (*scan == ' ' || *scan == '\t' || *scan == '\n'))
scan++;
if (sep_arr != NULL && scan > sep)
set_element(nf, sep, (long) (scan - sep), sep_arr);
if (scan >= end)
break;
field = scan;
while (*scan != ' ' && *scan != '\t' && *scan != '\n')
scan++;
(*set)(++nf, field, (long)(scan - field), n);
if (scan == end)
break;
sep = scan;
}
/* everything done, restore original char at *end */
*end = sav;
*buf = scan;
return nf;
}
/*
* posix_def_parse_field --- default field parsing.
*
* This is called both from get_field() and from do_split()
* via (*parse_field)(). This variation is for when FS is a single space
* character. The only difference between this and def_parse_field()
* is that this one does not allow newlines to separate fields.
*/
static long
posix_def_parse_field(long up_to, /* parse only up to this field number */
char **buf, /* on input: string to parse; on output: point to start next */
int len,
NODE *fs,
Regexp *rp ATTRIBUTE_UNUSED,
Setfunc set, /* routine to set the value of the parsed field */
NODE *n,
NODE *dummy ATTRIBUTE_UNUSED, /* sep_arr not needed here: hence dummy */
bool in_middle ATTRIBUTE_UNUSED)
{
char *scan = *buf;
long nf = parse_high_water;
char *field;
char *end = scan + len;
char sav;
if (up_to == UNLIMITED)
nf = 0;
if (len == 0)
return nf;
/*
* Nasty special case. If FS set to "", return whole record
* as first field. This is not worth a separate function.
*/
if (fs->stlen == 0) {
(*set)(++nf, *buf, len, n);
*buf += len;
return nf;
}
/* before doing anything save the char at *end */
sav = *end;
/* because it will be destroyed now: */
*end = ' '; /* sentinel character */
for (; nf < up_to; scan++) {
/*
* special case: fs is single space, strip leading whitespace
*/
while (scan < end && (*scan == ' ' || *scan == '\t'))
scan++;
if (scan >= end)
break;
field = scan;
while (*scan != ' ' && *scan != '\t')
scan++;
(*set)(++nf, field, (long)(scan - field), n);
if (scan == end)
break;
}
/* everything done, restore original char at *end */
*end = sav;
*buf = scan;
return nf;
}
/*
* null_parse_field --- each character is a separate field
*
* This is called both from get_field() and from do_split()
* via (*parse_field)(). This variation is for when FS is the null string.
*/
static long
null_parse_field(long up_to, /* parse only up to this field number */
char **buf, /* on input: string to parse; on output: point to start next */
int len,
NODE *fs ATTRIBUTE_UNUSED,
Regexp *rp ATTRIBUTE_UNUSED,
Setfunc set, /* routine to set the value of the parsed field */
NODE *n,
NODE *sep_arr, /* array of field separators (maybe NULL) */
bool in_middle ATTRIBUTE_UNUSED)
{
char *scan = *buf;
long nf = parse_high_water;
char *end = scan + len;
if (up_to == UNLIMITED)
nf = 0;
if (len == 0)
return nf;
#if MBS_SUPPORT
if (gawk_mb_cur_max > 1) {
mbstate_t mbs;
memset(&mbs, 0, sizeof(mbstate_t));
for (; nf < up_to && scan < end;) {
size_t mbclen = mbrlen(scan, end-scan, &mbs);
if ((mbclen == 1) || (mbclen == (size_t) -1)
|| (mbclen == (size_t) -2) || (mbclen == 0)) {
/* We treat it as a singlebyte character. */
mbclen = 1;
}
if (sep_arr != NULL && nf > 0)
set_element(nf, scan, 0L, sep_arr);
(*set)(++nf, scan, mbclen, n);
scan += mbclen;
}
} else
#endif
for (; nf < up_to && scan < end; scan++) {
if (sep_arr != NULL && nf > 0)
set_element(nf, scan, 0L, sep_arr);
(*set)(++nf, scan, 1L, n);
}
*buf = scan;
return nf;
}
/*
* sc_parse_field --- single character field separator
*
* This is called both from get_field() and from do_split()
* via (*parse_field)(). This variation is for when FS is a single character
* other than space.
*/
static long
sc_parse_field(long up_to, /* parse only up to this field number */
char **buf, /* on input: string to parse; on output: point to start next */
int len,
NODE *fs,
Regexp *rp ATTRIBUTE_UNUSED,
Setfunc set, /* routine to set the value of the parsed field */
NODE *n,
NODE *sep_arr, /* array of field separators (maybe NULL) */
bool in_middle ATTRIBUTE_UNUSED)
{
char *scan = *buf;
char fschar;
long nf = parse_high_water;
char *field;
char *end = scan + len;
char sav;
#if MBS_SUPPORT
size_t mbclen = 0;
mbstate_t mbs;
if (gawk_mb_cur_max > 1)
memset(&mbs, 0, sizeof(mbstate_t));
#endif
if (up_to == UNLIMITED)
nf = 0;
if (len == 0)
return nf;
if (RS_is_null && fs->stlen == 0)
fschar = '\n';
else
fschar = fs->stptr[0];
/* before doing anything save the char at *end */
sav = *end;
/* because it will be destroyed now: */
*end = fschar; /* sentinel character */
for (; nf < up_to;) {
field = scan;
#if MBS_SUPPORT
if (gawk_mb_cur_max > 1) {
while (*scan != fschar) {
mbclen = mbrlen(scan, end-scan, &mbs);
if ((mbclen == 1) || (mbclen == (size_t) -1)
|| (mbclen == (size_t) -2) || (mbclen == 0)) {
/* We treat it as a singlebyte character. */
mbclen = 1;
}
scan += mbclen;
}
} else
#endif
while (*scan != fschar)
scan++;
(*set)(++nf, field, (long)(scan - field), n);
if (scan == end)
break;
if (sep_arr != NULL)
set_element(nf, scan, 1L, sep_arr);
scan++;
if (scan == end) { /* FS at end of record */
(*set)(++nf, field, 0L, n);
break;
}
}
/* everything done, restore original char at *end */
*end = sav;
*buf = scan;
return nf;
}
/*
* fw_parse_field --- field parsing using FIELDWIDTHS spec
*
* This is called from get_field() via (*parse_field)().
* This variation is for fields are fixed widths.
*/
static long
fw_parse_field(long up_to, /* parse only up to this field number */
char **buf, /* on input: string to parse; on output: point to start next */
int len,
NODE *fs ATTRIBUTE_UNUSED,
Regexp *rp ATTRIBUTE_UNUSED,
Setfunc set, /* routine to set the value of the parsed field */
NODE *n,
NODE *dummy ATTRIBUTE_UNUSED, /* sep_arr not needed here: hence dummy */
bool in_middle ATTRIBUTE_UNUSED)
{
char *scan = *buf;
long nf = parse_high_water;
char *end = scan + len;
#if MBS_SUPPORT
int nmbc;
size_t mbclen;
size_t mbslen;
size_t lenrest;
char *mbscan;
mbstate_t mbs;
memset(&mbs, 0, sizeof(mbstate_t));
#endif
if (up_to == UNLIMITED)
nf = 0;
if (len == 0)
return nf;
for (; nf < up_to && (len = FIELDWIDTHS[nf+1]) != -1; ) {
#if MBS_SUPPORT
if (gawk_mb_cur_max > 1) {
nmbc = 0;
mbslen = 0;
mbscan = scan;
lenrest = end - scan;
while (nmbc < len && mbslen < lenrest) {
mbclen = mbrlen(mbscan, end - mbscan, &mbs);
if ( mbclen == 1
|| mbclen == (size_t) -1
|| mbclen == (size_t) -2
|| mbclen == 0) {
/* We treat it as a singlebyte character. */
mbclen = 1;
}
if (mbclen <= end - mbscan) {
mbscan += mbclen;
mbslen += mbclen;
++nmbc;
}
}
(*set)(++nf, scan, (long) mbslen, n);
scan += mbslen;
}
else
#endif
{
if (len > end - scan)
len = end - scan;
(*set)(++nf, scan, (long) len, n);
scan += len;
}
}
if (len == -1)
*buf = end;
else
*buf = scan;
return nf;
}
/* invalidate_field0 --- $0 needs reconstruction */
void
invalidate_field0()
{
field0_valid = false;
}
/* get_field --- return a particular $n */
/* assign is not NULL if this field is on the LHS of an assign */
NODE **
get_field(long requested, Func_ptr *assign)
{
bool in_middle = false;
/*
* if requesting whole line but some other field has been altered,
* then the whole line must be rebuilt
*/
if (requested == 0) {
if (! field0_valid) {
/* first, parse remainder of input record */
if (NF == -1) {
NF = (*parse_field)(UNLIMITED - 1, &parse_extent,
fields_arr[0]->stlen -
(parse_extent - fields_arr[0]->stptr),
save_FS, FS_regexp, set_field,
(NODE *) NULL,
(NODE *) NULL,
in_middle);
parse_high_water = NF;
}
rebuild_record();
}
if (assign != NULL)
*assign = reset_record;
return &fields_arr[0];
}
/* assert(requested > 0); */
#if 0
if (assign != NULL)
field0_valid = false; /* $0 needs reconstruction */
#else
/*
* Keep things uniform. Also, mere intention of assigning something
* to $n should not make $0 invalid. Makes sense to invalidate $0
* after the actual assignment is performed. Not a real issue in
* the interpreter otherwise, but causes problem in the
* debugger when watching or printing fields.
*/
if (assign != NULL)
*assign = invalidate_field0; /* $0 needs reconstruction */
#endif
if (requested <= parse_high_water) /* already parsed this field */
return &fields_arr[requested];
if (NF == -1) { /* have not yet parsed to end of record */
/*
* parse up to requested fields, calling set_field() for each,
* saving in parse_extent the point where the parse left off
*/
if (parse_high_water == 0) /* starting at the beginning */
parse_extent = fields_arr[0]->stptr;
else
in_middle = true;
parse_high_water = (*parse_field)(requested, &parse_extent,
fields_arr[0]->stlen - (parse_extent - fields_arr[0]->stptr),
save_FS, NULL, set_field, (NODE *) NULL, (NODE *) NULL, in_middle);
/*
* if we reached the end of the record, set NF to the number of
* fields so far. Note that requested might actually refer to
* a field that is beyond the end of the record, but we won't
* set NF to that value at this point, since this is only a
* reference to the field and NF only gets set if the field
* is assigned to -- this case is handled below
*/
if (parse_extent == fields_arr[0]->stptr + fields_arr[0]->stlen)
NF = parse_high_water;
else if (parse_field == fpat_parse_field) {
/* FPAT parsing is wierd, isolate the special cases */
char *rec_start = fields_arr[0]->stptr;
char *rec_end = fields_arr[0]->stptr + fields_arr[0]->stlen;
if ( parse_extent > rec_end
|| (parse_extent > rec_start && parse_extent < rec_end && requested == UNLIMITED-1))
NF = parse_high_water;
else if (parse_extent == rec_start) /* could be no match for FPAT */
NF = 0;
}
if (requested == UNLIMITED - 1) /* UNLIMITED-1 means set NF */
requested = parse_high_water;
}
if (parse_high_water < requested) { /* requested beyond end of record */
if (assign != NULL) { /* expand record */
if (requested > nf_high_water)
grow_fields_arr(requested);
NF = requested;
parse_high_water = requested;
} else
return &Null_field;
}
return &fields_arr[requested];
}
/* set_element --- set an array element, used by do_split() */
static void
set_element(long num, char *s, long len, NODE *n)
{
NODE *it;
NODE **lhs;
NODE *sub;
it = make_string(s, len);
it->flags |= MAYBE_NUM;
sub = make_number((AWKNUM) (num));
lhs = assoc_lookup(n, sub);
unref(sub);
unref(*lhs);
*lhs = it;
}
/* do_split --- implement split(), semantics are same as for field splitting */
NODE *
do_split(int nargs)
{
NODE *src, *arr, *sep, *fs, *tmp, *sep_arr = NULL;
char *s;
long (*parseit)(long, char **, int, NODE *,
Regexp *, Setfunc, NODE *, NODE *, bool);
Regexp *rp = NULL;
if (nargs == 4) {
static bool warned1 = false, warned2 = false;
if (do_traditional || do_posix) {
fatal(_("split: fourth argument is a gawk extension"));
}
sep_arr = POP_PARAM();
if (sep_arr->type != Node_var_array)
fatal(_("split: fourth argument is not an array"));
if (do_lint && ! warned1) {
warned1 = true;
lintwarn(_("split: fourth argument is a gawk extension"));
}
if (do_lint_old && ! warned2) {
warned2 = true;
warning(_("split: fourth argument is a gawk extension"));
}
}
sep = POP();
arr = POP_PARAM();
if (arr->type != Node_var_array)
fatal(_("split: second argument is not an array"));
if (sep_arr != NULL) {
if (sep_arr == arr)
fatal(_("split: cannot use the same array for second and fourth args"));
/* This checks need to be done before clearing any of the arrays */
for (tmp = sep_arr->parent_array; tmp != NULL; tmp = tmp->parent_array)
if (tmp == arr)
fatal(_("split: cannot use a subarray of second arg for fourth arg"));
for (tmp = arr->parent_array; tmp != NULL; tmp = tmp->parent_array)
if (tmp == sep_arr)
fatal(_("split: cannot use a subarray of fourth arg for second arg"));
assoc_clear(sep_arr);
}
assoc_clear(arr);
src = TOP_STRING();
if (src->stlen == 0) {
/*
* Skip the work if first arg is the null string.