Move awk from textutils to editors. Cleanup run-parts, saves 200 bytes, moves the guts of run_parts to libbb to be used by ifupdown.

1 files changed, 2742 insertions, 0 deletions

diff --git a/editors/awk.c b/editors/awk.c
new file mode 100644
index 0000000..968fa02
--- /dev/null
+++ b/editors/awk.c
@@ -0,0 +1,2742 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * awk implementation for busybox
+ *
+ * Copyright (C) 2002 by Dmitry Zakharov <dmit@crp.bank.gov.ua>
+ *
+ * This program 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.
+ *
+ * This program 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 <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <time.h>
+#include <math.h>
+#include <ctype.h>
+#include <getopt.h>
+#include <regex.h>
+
+#include "busybox.h"
+
+
+#define	MAXVARFMT	240
+#define	MINNVBLOCK	64
+
+/* variable flags */
+#define	VF_NUMBER	0x0001	/* 1 = primary type is number */
+#define	VF_ARRAY	0x0002	/* 1 = it's an array */
+
+#define	VF_CACHED	0x0100	/* 1 = num/str value has cached str/num eq */
+#define	VF_USER		0x0200	/* 1 = user input (may be numeric string) */
+#define	VF_SPECIAL	0x0400	/* 1 = requires extra handling when changed */
+#define	VF_WALK		0x0800	/* 1 = variable has alloc'd x.walker list */
+#define	VF_FSTR		0x1000	/* 1 = string points to fstring buffer */
+#define	VF_CHILD	0x2000	/* 1 = function arg; x.parent points to source */
+#define	VF_DIRTY	0x4000	/* 1 = variable was set explicitly */
+
+/* these flags are static, don't change them when value is changed */
+#define	VF_DONTTOUCH (VF_ARRAY | VF_SPECIAL | VF_WALK | VF_CHILD | VF_DIRTY)
+
+/* Variable */
+typedef struct var_s {
+	unsigned short type;		/* flags */
+	double number;
+	char *string;
+	union {
+		int aidx;				/* func arg index (on compilation stage) */
+		struct xhash_s *array;	/* array ptr */
+		struct var_s *parent;	/* for func args, ptr to actual parameter */
+		char **walker;			/* list of array elements (for..in) */
+	} x;
+} var;
+
+/* Node chain (pattern-action chain, BEGIN, END, function bodies) */
+typedef struct chain_s {
+	struct node_s *first;
+	struct node_s *last;
+	char *programname;
+} chain;
+
+/* Function */
+typedef struct func_s {
+	unsigned short nargs;
+	struct chain_s body;
+} func;
+
+/* I/O stream */
+typedef struct rstream_s {
+	FILE *F;
+	char *buffer;
+	int size;
+	int pos;
+	unsigned short is_pipe;
+} rstream;
+
+typedef struct hash_item_s {
+	union {
+		struct var_s v;			/* variable/array hash */
+		struct rstream_s rs;	/* redirect streams hash */
+		struct func_s f;		/* functions hash */
+	} data;
+	struct hash_item_s *next;	/* next in chain */
+	char name[1];				/* really it's longer */
+} hash_item;
+
+typedef struct xhash_s {
+	unsigned int nel;					/* num of elements */
+	unsigned int csize;					/* current hash size */
+	unsigned int nprime;				/* next hash size in PRIMES[] */
+	unsigned int glen;					/* summary length of item names */
+	struct hash_item_s **items;
+} xhash;
+
+/* Tree node */
+typedef struct node_s {
+	unsigned long info;
+	unsigned short lineno;
+	union {
+		struct node_s *n;
+		var *v;
+		int i;
+		char *s;
+		regex_t *re;
+	} l;
+	union {
+		struct node_s *n;
+		regex_t *ire;
+		func *f;
+		int argno;
+	} r;
+	union {
+		struct node_s *n;
+	} a;
+} node;
+
+/* Block of temporary variables */
+typedef struct nvblock_s {
+	int size;
+	var *pos;
+	struct nvblock_s *prev;
+	struct nvblock_s *next;
+	var nv[0];
+} nvblock;
+
+typedef struct tsplitter_s {
+	node n;
+	regex_t re[2];
+} tsplitter;
+
+/* simple token classes */
+/* Order and hex values are very important!!!  See next_token() */
+#define	TC_SEQSTART	 1				/* ( */
+#define	TC_SEQTERM	(1 << 1)		/* ) */
+#define	TC_REGEXP	(1 << 2)		/* /.../ */
+#define	TC_OUTRDR	(1 << 3)		/* | > >> */
+#define	TC_UOPPOST	(1 << 4)		/* unary postfix operator */
+#define	TC_UOPPRE1	(1 << 5)		/* unary prefix operator */
+#define	TC_BINOPX	(1 << 6)		/* two-opnd operator */
+#define	TC_IN		(1 << 7)
+#define	TC_COMMA	(1 << 8)
+#define	TC_PIPE		(1 << 9)		/* input redirection pipe */
+#define	TC_UOPPRE2	(1 << 10)		/* unary prefix operator */
+#define	TC_ARRTERM	(1 << 11)		/* ] */
+#define	TC_GRPSTART	(1 << 12)		/* { */
+#define	TC_GRPTERM	(1 << 13)		/* } */
+#define	TC_SEMICOL	(1 << 14)
+#define	TC_NEWLINE	(1 << 15)
+#define	TC_STATX	(1 << 16)		/* ctl statement (for, next...) */
+#define	TC_WHILE	(1 << 17)
+#define	TC_ELSE		(1 << 18)
+#define	TC_BUILTIN	(1 << 19)
+#define	TC_GETLINE	(1 << 20)
+#define	TC_FUNCDECL	(1 << 21)		/* `function' `func' */
+#define	TC_BEGIN	(1 << 22)
+#define	TC_END		(1 << 23)
+#define	TC_EOF		(1 << 24)
+#define	TC_VARIABLE	(1 << 25)
+#define	TC_ARRAY	(1 << 26)
+#define	TC_FUNCTION	(1 << 27)
+#define	TC_STRING	(1 << 28)
+#define	TC_NUMBER	(1 << 29)
+
+#define	TC_UOPPRE	(TC_UOPPRE1 | TC_UOPPRE2)
+
+/* combined token classes */
+#define	TC_BINOP	(TC_BINOPX | TC_COMMA | TC_PIPE | TC_IN)
+#define	TC_UNARYOP	(TC_UOPPRE | TC_UOPPOST)
+#define	TC_OPERAND	(TC_VARIABLE | TC_ARRAY | TC_FUNCTION | \
+	TC_BUILTIN | TC_GETLINE | TC_SEQSTART | TC_STRING | TC_NUMBER)
+
+#define	TC_STATEMNT	(TC_STATX | TC_WHILE)
+#define	TC_OPTERM	(TC_SEMICOL | TC_NEWLINE)
+
+/* word tokens, cannot mean something else if not expected */
+#define	TC_WORD		(TC_IN | TC_STATEMNT | TC_ELSE | TC_BUILTIN | \
+	TC_GETLINE | TC_FUNCDECL | TC_BEGIN | TC_END)
+
+/* discard newlines after these */
+#define	TC_NOTERM	(TC_COMMA | TC_GRPSTART | TC_GRPTERM | \
+	TC_BINOP | TC_OPTERM)
+
+/* what can expression begin with */
+#define	TC_OPSEQ	(TC_OPERAND | TC_UOPPRE | TC_REGEXP)
+/* what can group begin with */
+#define	TC_GRPSEQ	(TC_OPSEQ | TC_OPTERM | TC_STATEMNT | TC_GRPSTART)
+
+/* if previous token class is CONCAT1 and next is CONCAT2, concatenation */
+/* operator is inserted between them */
+#define	TC_CONCAT1	(TC_VARIABLE | TC_ARRTERM | TC_SEQTERM | \
+	TC_STRING | TC_NUMBER | TC_UOPPOST)
+#define	TC_CONCAT2	(TC_OPERAND | TC_UOPPRE)
+
+#define	OF_RES1		0x010000
+#define	OF_RES2		0x020000
+#define	OF_STR1		0x040000
+#define	OF_STR2		0x080000
+#define	OF_NUM1		0x100000
+#define	OF_CHECKED	0x200000
+
+/* combined operator flags */
+#define	xx	0
+#define	xV	OF_RES2
+#define	xS	(OF_RES2 | OF_STR2)
+#define	Vx	OF_RES1
+#define	VV	(OF_RES1 | OF_RES2)
+#define	Nx	(OF_RES1 | OF_NUM1)
+#define	NV	(OF_RES1 | OF_NUM1 | OF_RES2)
+#define	Sx	(OF_RES1 | OF_STR1)
+#define	SV	(OF_RES1 | OF_STR1 | OF_RES2)
+#define	SS	(OF_RES1 | OF_STR1 | OF_RES2 | OF_STR2)
+
+#define	OPCLSMASK	0xFF00
+#define	OPNMASK		0x007F
+
+/* operator priority is a highest byte (even: r->l, odd: l->r grouping)
+ * For builtins it has different meaning: n n s3 s2 s1 v3 v2 v1,
+ * n - min. number of args, vN - resolve Nth arg to var, sN - resolve to string
+ */
+#define	P(x)	(x << 24)
+#define	PRIMASK		0x7F000000
+#define	PRIMASK2	0x7E000000
+
+/* Operation classes */
+
+#define	SHIFT_TIL_THIS	0x0600
+#define	RECUR_FROM_THIS	0x1000
+
+enum {
+	OC_DELETE=0x0100,	OC_EXEC=0x0200,		OC_NEWSOURCE=0x0300,
+	OC_PRINT=0x0400,	OC_PRINTF=0x0500,	OC_WALKINIT=0x0600,
+
+	OC_BR=0x0700,		OC_BREAK=0x0800,	OC_CONTINUE=0x0900,
+	OC_EXIT=0x0a00,		OC_NEXT=0x0b00,		OC_NEXTFILE=0x0c00,
+	OC_TEST=0x0d00,		OC_WALKNEXT=0x0e00,
+
+	OC_BINARY=0x1000,	OC_BUILTIN=0x1100,	OC_COLON=0x1200,
+	OC_COMMA=0x1300,	OC_COMPARE=0x1400,	OC_CONCAT=0x1500,
+	OC_FBLTIN=0x1600,	OC_FIELD=0x1700,	OC_FNARG=0x1800,
+	OC_FUNC=0x1900,		OC_GETLINE=0x1a00,	OC_IN=0x1b00,
+	OC_LAND=0x1c00,		OC_LOR=0x1d00,		OC_MATCH=0x1e00,
+	OC_MOVE=0x1f00,		OC_PGETLINE=0x2000,	OC_REGEXP=0x2100,
+	OC_REPLACE=0x2200,	OC_RETURN=0x2300,	OC_SPRINTF=0x2400,
+	OC_TERNARY=0x2500,	OC_UNARY=0x2600,	OC_VAR=0x2700,
+	OC_DONE=0x2800,
+
+	ST_IF=0x3000,		ST_DO=0x3100,		ST_FOR=0x3200,
+	ST_WHILE=0x3300
+};
+
+/* simple builtins */
+enum {
+	F_in=0,	F_rn,	F_co,	F_ex,	F_lg,	F_si,	F_sq,	F_sr,
+	F_ti,	F_le,	F_sy,	F_ff,	F_cl
+};
+
+/* builtins */
+enum {
+	B_a2=0,	B_ix,	B_ma,	B_sp,	B_ss,	B_ti,	B_lo,	B_up,
+	B_ge,	B_gs,	B_su
+};
+
+/* tokens and their corresponding info values */
+
+#define	NTC		"\377"		/* switch to next token class (tc<<1) */
+#define	NTCC	'\377'
+
+#define	OC_B	OC_BUILTIN
+
+static char * const tokenlist =
+	"\1("		NTC
+	"\1)"		NTC
+	"\1/"		NTC									/* REGEXP */
+	"\2>>"		"\1>"		"\1|"		NTC			/* OUTRDR */
+	"\2++"		"\2--"		NTC						/* UOPPOST */
+	"\2++"		"\2--"		"\1$"		NTC			/* UOPPRE1 */
+	"\2=="		"\1="		"\2+="		"\2-="		/* BINOPX */
+	"\2*="		"\2/="		"\2%="		"\2^="
+	"\1+"		"\1-"		"\3**="		"\2**"
+	"\1/"		"\1%"		"\1^"		"\1*"
+	"\2!="		"\2>="		"\2<="		"\1>"
+	"\1<"		"\2!~"		"\1~"		"\2&&"
+	"\2||"		"\1?"		"\1:"		NTC
+	"\2in"		NTC
+	"\1,"		NTC
+	"\1|"		NTC
+	"\1+"		"\1-"		"\1!"		NTC			/* UOPPRE2 */
+	"\1]"		NTC
+	"\1{"		NTC
+	"\1}"		NTC
+	"\1;"		NTC
+	"\1\n"		NTC
+	"\2if"		"\2do"		"\3for"		"\5break"	/* STATX */
+	"\10continue"			"\6delete"	"\5print"
+	"\6printf"	"\4next"	"\10nextfile"
+	"\6return"	"\4exit"	NTC
+	"\5while"	NTC
+	"\4else"	NTC
+
+	"\5close"	"\6system"	"\6fflush"	"\5atan2"	/* BUILTIN */
+	"\3cos"		"\3exp"		"\3int"		"\3log"
+	"\4rand"	"\3sin"		"\4sqrt"	"\5srand"
+	"\6gensub"	"\4gsub"	"\5index"	"\6length"
+	"\5match"	"\5split"	"\7sprintf"	"\3sub"
+	"\6substr"	"\7systime"	"\10strftime"
+	"\7tolower"	"\7toupper"	NTC
+	"\7getline"	NTC
+	"\4func"	"\10function"	NTC
+	"\5BEGIN"	NTC
+	"\3END"		"\0"
+	;
+
+static unsigned long tokeninfo[] = {
+
+	0,
+	0,
+	OC_REGEXP,
+	xS|'a',		xS|'w',		xS|'|',
+	OC_UNARY|xV|P(9)|'p',		OC_UNARY|xV|P(9)|'m',
+	OC_UNARY|xV|P(9)|'P',		OC_UNARY|xV|P(9)|'M',
+		OC_FIELD|xV|P(5),
+	OC_COMPARE|VV|P(39)|5,		OC_MOVE|VV|P(74),
+		OC_REPLACE|NV|P(74)|'+',	OC_REPLACE|NV|P(74)|'-',
+	OC_REPLACE|NV|P(74)|'*',	OC_REPLACE|NV|P(74)|'/',
+		OC_REPLACE|NV|P(74)|'%',	OC_REPLACE|NV|P(74)|'&',
+	OC_BINARY|NV|P(29)|'+',		OC_BINARY|NV|P(29)|'-',
+		OC_REPLACE|NV|P(74)|'&',	OC_BINARY|NV|P(15)|'&',
+	OC_BINARY|NV|P(25)|'/',		OC_BINARY|NV|P(25)|'%',
+		OC_BINARY|NV|P(15)|'&',		OC_BINARY|NV|P(25)|'*',
+	OC_COMPARE|VV|P(39)|4,		OC_COMPARE|VV|P(39)|3,
+		OC_COMPARE|VV|P(39)|0,		OC_COMPARE|VV|P(39)|1,
+	OC_COMPARE|VV|P(39)|2,		OC_MATCH|Sx|P(45)|'!',
+		OC_MATCH|Sx|P(45)|'~',		OC_LAND|Vx|P(55),
+	OC_LOR|Vx|P(59),			OC_TERNARY|Vx|P(64)|'?',
+		OC_COLON|xx|P(67)|':',
+	OC_IN|SV|P(49),
+	OC_COMMA|SS|P(80),
+	OC_PGETLINE|SV|P(37),
+	OC_UNARY|xV|P(19)|'+',		OC_UNARY|xV|P(19)|'-',
+		OC_UNARY|xV|P(19)|'!',
+	0,
+	0,
+	0,
+	0,
+	0,
+	ST_IF,			ST_DO,			ST_FOR,			OC_BREAK,
+	OC_CONTINUE,					OC_DELETE|Vx,	OC_PRINT,
+	OC_PRINTF,		OC_NEXT,		OC_NEXTFILE,
+	OC_RETURN|Vx,	OC_EXIT|Nx,
+	ST_WHILE,
+	0,
+
+	OC_FBLTIN|Sx|F_cl, OC_FBLTIN|Sx|F_sy, OC_FBLTIN|Sx|F_ff, OC_B|B_a2|P(0x83),
+	OC_FBLTIN|Nx|F_co, OC_FBLTIN|Nx|F_ex, OC_FBLTIN|Nx|F_in, OC_FBLTIN|Nx|F_lg,
+	OC_FBLTIN|F_rn,    OC_FBLTIN|Nx|F_si, OC_FBLTIN|Nx|F_sq, OC_FBLTIN|Nx|F_sr,
+	OC_B|B_ge|P(0xd6), OC_B|B_gs|P(0xb6), OC_B|B_ix|P(0x9b), OC_FBLTIN|Sx|F_le,
+	OC_B|B_ma|P(0x89), OC_B|B_sp|P(0x8b), OC_SPRINTF,        OC_B|B_su|P(0xb6),
+	OC_B|B_ss|P(0x8f), OC_FBLTIN|F_ti,    OC_B|B_ti|P(0x0b),
+	OC_B|B_lo|P(0x49), OC_B|B_up|P(0x49),
+	OC_GETLINE|SV|P(0),
+	0,	0,
+	0,
+	0
+};
+
+/* internal variable names and their initial values       */
+/* asterisk marks SPECIAL vars; $ is just no-named Field0 */ 
+enum {
+	CONVFMT=0,	OFMT,		FS,			OFS,
+	ORS,		RS,			RT,			FILENAME,
+	SUBSEP,		ARGIND,		ARGC,		ARGV,
+	ERRNO,		FNR,
+	NR,			NF,			IGNORECASE,
+	ENVIRON,	F0,			_intvarcount_
+};
+
+static char * vNames =
+	"CONVFMT\0"	"OFMT\0"	"FS\0*"		"OFS\0"
+	"ORS\0"		"RS\0*"		"RT\0"		"FILENAME\0"	
+	"SUBSEP\0"	"ARGIND\0"	"ARGC\0"	"ARGV\0"
+	"ERRNO\0"	"FNR\0"
+	"NR\0"		"NF\0*"		"IGNORECASE\0*"
+	"ENVIRON\0"	"$\0*"		"\0";
+
+static char * vValues =
+	"%.6g\0"	"%.6g\0"	" \0"		" \0"
+	"\n\0"		"\n\0"		"\0"		"\0"
+	"\034\0"
+	"\377";
+
+/* hash size may grow to these values */
+#define FIRST_PRIME 61;
+static const unsigned int PRIMES[] = { 251, 1021, 4093, 16381, 65521 };
+static const unsigned int NPRIMES = sizeof(PRIMES) / sizeof(unsigned int);
+
+/* globals */
+
+extern char **environ;
+
+static var * V[_intvarcount_];
+static chain beginseq, mainseq, endseq, *seq;
+static int nextrec, nextfile;
+static node *break_ptr, *continue_ptr;
+static rstream *iF;
+static xhash *vhash, *ahash, *fdhash, *fnhash;
+static char *programname;
+static short lineno;
+static int is_f0_split;
+static int nfields = 0;
+static var *Fields = NULL;
+static tsplitter fsplitter, rsplitter;
+static nvblock *cb = NULL;
+static char *pos;
+static char *buf;
+static int icase = FALSE;
+
+static struct {
+	unsigned long tclass;
+	unsigned long info;
+	char *string;
+	double number;
+	short lineno;
+	int rollback;
+} t;
+
+/* function prototypes */
+extern void xregcomp(regex_t *preg, const char *regex, int cflags);
+static void handle_special(var *);
+static node *parse_expr(unsigned long);
+static void chain_group(void);
+static var *evaluate(node *, var *);
+static rstream *next_input_file(void);
+static int fmt_num(char *, int, char *, double, int);
+static int awk_exit(int);
+
+/* ---- error handling ---- */
+
+static const char EMSG_INTERNAL_ERROR[] = "Internal error";
+static const char EMSG_UNEXP_EOS[] = "Unexpected end of string";
+static const char EMSG_UNEXP_TOKEN[] = "Unexpected token";
+static const char EMSG_DIV_BY_ZERO[] = "Division by zero";
+static const char EMSG_INV_FMT[] = "Invalid format specifier";
+static const char EMSG_TOO_FEW_ARGS[] = "Too few arguments for builtin";
+static const char EMSG_NOT_ARRAY[] = "Not an array";
+static const char EMSG_POSSIBLE_ERROR[] = "Possible syntax error";
+static const char EMSG_UNDEF_FUNC[] = "Call to undefined function";
+#ifndef CONFIG_FEATURE_AWK_MATH
+static const char EMSG_NO_MATH[] = "Math support is not compiled in";
+#endif
+
+static void syntax_error(const char * const message) {
+
+	fprintf(stderr, "awk: %s:%i: %s\n", programname, lineno, message);
+	awk_exit(1);
+}
+
+#define runtime_error(x) syntax_error(x)
+
+
+/* ---- hash stuff ---- */
+
+static unsigned int hashidx(char *name) {
+
+	register unsigned int idx=0;
+
+	while (*name)  idx = *name++ + (idx << 6) - idx;
+	return idx;
+}
+
+/* create new hash */
+static xhash *hash_init(void) {
+
+	xhash *newhash;
+	
+	newhash = (xhash *)xcalloc(1, sizeof(xhash));
+	newhash->csize = FIRST_PRIME;
+	newhash->items = (hash_item **)xcalloc(newhash->csize, sizeof(hash_item *));
+
+	return newhash;
+}
+
+/* find item in hash, return ptr to data, NULL if not found */
+static void *hash_search(xhash *hash, char *name) {
+
+	hash_item *hi;
+
+	hi = hash->items [ hashidx(name) % hash->csize ];
+	while (hi) {
+		if (strcmp(hi->name, name) == 0)
+			return &(hi->data);
+		hi = hi->next;
+	}
+	return NULL;
+}
+
+/* grow hash if it becomes too big */
+static void hash_rebuild(xhash *hash) {
+
+	unsigned int newsize, i, idx;
+	hash_item **newitems, *hi, *thi;
+
+	if (hash->nprime == NPRIMES)
+		return;
+
+	newsize = PRIMES[hash->nprime++];
+	newitems = (hash_item **)xcalloc(newsize, sizeof(hash_item *));
+
+	for (i=0; i<hash->csize; i++) {
+		hi = hash->items[i];
+		while (hi) {
+			thi = hi;
+			hi = thi->next;
+			idx = hashidx(thi->name) % newsize;
+			thi->next = newitems[idx];
+			newitems[idx] = thi;
+		}
+	}
+
+	free(hash->items);
+	hash->csize = newsize;
+	hash->items = newitems;
+}
+
+/* find item in hash, add it if necessary. Return ptr to data */
+static void *hash_find(xhash *hash, char *name) {
+
+	hash_item *hi;
+	unsigned int idx;
+	int l;
+
+	hi = hash_search(hash, name);
+	if (! hi) {
+		if (++hash->nel / hash->csize > 10)
+			hash_rebuild(hash);
+
+		l = xstrlen(name) + 1;
+		hi = xcalloc(sizeof(hash_item) + l, 1);
+		memcpy(hi->name, name, l);
+
+		idx = hashidx(name) % hash->csize;
+		hi->next = hash->items[idx];
+		hash->items[idx] = hi;
+		hash->glen += l;
+	}
+	return &(hi->data);
+}
+
+#define findvar(hash, name) (var *) hash_find ( (hash) , (name) )
+#define newvar(name) (var *) hash_find ( vhash , (name) )
+#define newfile(name) (rstream *) hash_find ( fdhash , (name) )
+#define newfunc(name) (func *) hash_find ( fnhash , (name) )
+
+static void hash_remove(xhash *hash, char *name) {
+
+	hash_item *hi, **phi;
+
+	phi = &(hash->items[ hashidx(name) % hash->csize ]);
+	while (*phi) {
+		hi = *phi;
+		if (strcmp(hi->name, name) == 0) {
+			hash->glen -= (xstrlen(name) + 1);
+			hash->nel--;
+			*phi = hi->next;
+			free(hi);
+			break;
+		}
+		phi = &(hi->next);
+	}
+}
+
+/* ------ some useful functions ------ */
+
+static void skip_spaces(char **s) {
+
+	register char *p = *s;
+
+	while(*p == ' ' || *p == '\t' ||
+					(*p == '\\' && *(p+1) == '\n' && (++p, ++t.lineno))) {
+	 	p++;
+	}
+	*s = p;
+}
+
+static char *nextword(char **s) {
+
+	register char *p = *s;
+
+	while (*(*s)++) ;
+
+	return p;
+}
+
+static char nextchar(char **s) {
+
+	register char c, *pps;
+
+	c = *((*s)++);
+	pps = *s;
+	if (c == '\\') c = process_escape_sequence((const char**)s);
+	if (c == '\\' && *s == pps) c = *((*s)++);
+	return c;
+}
+
+static inline int isalnum_(int c) {
+
+	return (isalnum(c) || c == '_');
+}
+
+static FILE *afopen(const char *path, const char *mode) {
+
+	return (*path == '-' && *(path+1) == '\0') ? stdin : xfopen(path, mode);
+}
+
+/* -------- working with variables (set/get/copy/etc) -------- */
+
+static xhash *iamarray(var *v) {
+
+	var *a = v;
+
+	while (a->type & VF_CHILD)
+		a = a->x.parent;
+
+	if (! (a->type & VF_ARRAY)) {
+		a->type |= VF_ARRAY;
+		a->x.array = hash_init();
+	}
+	return a->x.array;
+}
+
+static void clear_array(xhash *array) {
+
+	unsigned int i;
+	hash_item *hi, *thi;
+
+	for (i=0; i<array->csize; i++) {
+		hi = array->items[i];
+		while (hi) {
+			thi = hi;
+			hi = hi->next;
+			if (thi->data.v.string) free(thi->data.v.string);
+			free(thi);
+		}
+		array->items[i] = NULL;
+	}
+	array->glen = array->nel = 0;
+}
+
+/* clear a variable */
+static var *clrvar(var *v) {
+
+	if (v->string && !(v->type & VF_FSTR))
+		free(v->string);
+
+	v->type &= VF_DONTTOUCH;
+	v->type |= VF_DIRTY;
+	v->string = NULL;
+	return v;
+}
+
+/* assign string value to variable */
+static var *setvar_p(var *v, char *value) {
+
+	clrvar(v);
+	v->string = value;
+	handle_special(v);
+
+	return v;
+}
+
+/* same as setvar_p but make a copy of string */
+static var *setvar_s(var *v, char *value) {
+
+	return setvar_p(v, (value && *value) ? xstrdup(value) : NULL);
+}
+
+/* same as setvar_s but set USER flag */
+static var *setvar_u(var *v, char *value) {
+
+	setvar_s(v, value);
+	v->type |= VF_USER;
+	return v;
+}
+
+/* set array element to user string */
+static void setari_u(var *a, int idx, char *s) {
+
+	register var *v;
+	static char sidx[12];
+
+	sprintf(sidx, "%d", idx);
+	v = findvar(iamarray(a), sidx);
+	setvar_u(v, s);
+}
+
+/* assign numeric value to variable */
+static var *setvar_i(var *v, double value) {
+
+	clrvar(v);
+	v->type |= VF_NUMBER;
+	v->number = value;
+	handle_special(v);
+	return v;
+}
+
+static char *getvar_s(var *v) {
+
+	/* if v is numeric and has no cached string, convert it to string */
+	if ((v->type & (VF_NUMBER | VF_CACHED)) == VF_NUMBER) {
+		fmt_num(buf, MAXVARFMT, getvar_s(V[CONVFMT]), v->number, TRUE);
+		v->string = xstrdup(buf);
+		v->type |= VF_CACHED;
+	}
+	return (v->string == NULL) ? "" : v->string;
+}
+
+static double getvar_i(var *v) {
+
+	char *s;
+
+	if ((v->type & (VF_NUMBER | VF_CACHED)) == 0) {
+		v->number = 0;
+		s = v->string;
+		if (s && *s) {
+			v->number = strtod(s, &s);
+			if (v->type & VF_USER) {
+				skip_spaces(&s);
+				if (*s != '\0')
+					v->type &= ~VF_USER;
+			}
+		} else {
+			v->type &= ~VF_USER;
+		}
+		v->type |= VF_CACHED;
+	}
+	return v->number;
+}
+
+static var *copyvar(var *dest, var *src) {
+
+	if (dest != src) {
+		clrvar(dest);
+		dest->type |= (src->type & ~VF_DONTTOUCH);
+		dest->number = src->number;
+		if (src->string)
+			dest->string = xstrdup(src->string);
+	}
+	handle_special(dest);
+	return dest;
+}
+
+static var *incvar(var *v) {
+
+	return setvar_i(v, getvar_i(v)+1.);
+}
+
+/* return true if v is number or numeric string */
+static int is_numeric(var *v) {
+
+	getvar_i(v);
+	return ((v->type ^ VF_DIRTY) & (VF_NUMBER | VF_USER | VF_DIRTY));
+}
+
+/* return 1 when value of v corresponds to true, 0 otherwise */
+static int istrue(var *v) {
+
+	if (is_numeric(v))
+		return (v->number == 0) ? 0 : 1;
+	else
+		return (v->string && *(v->string)) ? 1 : 0;
+}
+
+/* temporary varables allocator. Last allocated should be first freed */
+static var *nvalloc(int n) {
+
+	nvblock *pb = NULL;
+	var *v, *r;
+	int size;
+
+	while (cb) {
+		pb = cb;
+		if ((cb->pos - cb->nv) + n <= cb->size) break;
+		cb = cb->next;
+	}
+
+	if (! cb) {
+		size = (n <= MINNVBLOCK) ? MINNVBLOCK : n;
+		cb = (nvblock *)xmalloc(sizeof(nvblock) + size * sizeof(var));
+		cb->size = size;
+		cb->pos = cb->nv;
+		cb->prev = pb;
+		cb->next = NULL;
+		if (pb) pb->next = cb;
+	}
+
+	v = r = cb->pos;
+	cb->pos += n;
+
+	while (v < cb->pos) {
+		v->type = 0;
+		v->string = NULL;
+		v++;
+	}
+
+	return r;
+}
+
+static void nvfree(var *v) {
+
+	var *p;
+
+	if (v < cb->nv || v >= cb->pos)
+		runtime_error(EMSG_INTERNAL_ERROR);
+
+	for (p=v; p<cb->pos; p++) {
+		if ((p->type & (VF_ARRAY|VF_CHILD)) == VF_ARRAY) {
+			clear_array(iamarray(p));
+			free(p->x.array->items);
+			free(p->x.array);
+		}
+		if (p->type & VF_WALK)
+			free(p->x.walker);
+
+		clrvar(p);
+	}
+
+	cb->pos = v;
+	while (cb->prev && cb->pos == cb->nv) {
+		cb = cb->prev;
+	}
+}
+
+/* ------- awk program text parsing ------- */
+
+/* Parse next token pointed by global pos, place results into global t.
+ * If token isn't expected, give away. Return token class
+ */
+static unsigned long next_token(unsigned long expected) {
+
+	char *p, *pp, *s;
+	char *tl;
+	unsigned long tc, *ti;
+	int l;
+	static int concat_inserted = FALSE;
+	static unsigned long save_tclass, save_info;
+	static unsigned long ltclass = TC_OPTERM;
+
+	if (t.rollback) {
+
+		t.rollback = FALSE;
+
+	} else if (concat_inserted) {
+
+		concat_inserted = FALSE;
+		t.tclass = save_tclass;
+		t.info = save_info;
+
+	} else {
+
+		p = pos;
+
+	readnext:
+		skip_spaces(&p);
+		lineno = t.lineno;
+		if (*p == '#')
+			while (*p != '\n' && *p != '\0') p++;
+
+		if (*p == '\n')
+			t.lineno++;
+
+		if (*p == '\0') {
+			tc = TC_EOF;
+
+		} else if (*p == '\"') {
+			/* it's a string */
+			t.string = s = ++p;
+			while (*p != '\"') {
+				if (*p == '\0' || *p == '\n')
+					syntax_error(EMSG_UNEXP_EOS);
+				*(s++) = nextchar(&p);
+			}
+			p++;
+			*s = '\0';
+			tc = TC_STRING;
+
+		} else if ((expected & TC_REGEXP) && *p == '/') {
+			/* it's regexp */
+			t.string = s = ++p;
+			while (*p != '/') {
+				if (*p == '\0' || *p == '\n')
+					syntax_error(EMSG_UNEXP_EOS);
+				if ((*s++ = *p++) == '\\') {
+					pp = p;
+					*(s-1) = process_escape_sequence((const char **)&p);
+					if (*pp == '\\') *s++ = '\\';
+					if (p == pp) *s++ = *p++;
+				}
+			}
+			p++;
+			*s = '\0';
+			tc = TC_REGEXP;
+
+		} else if (*p == '.' || isdigit(*p)) {
+			/* it's a number */
+			t.number = strtod(p, &p);
+			if (*p == '.')
+				syntax_error(EMSG_UNEXP_TOKEN);
+			tc = TC_NUMBER;
+
+		} else {
+			/* search for something known */
+			tl = tokenlist;
+			tc = 0x00000001;
+			ti = tokeninfo;
+			while (*tl) {
+				l = *(tl++);
+				if (l == NTCC) {
+					tc <<= 1;
+					continue;
+				}
+				/* if token class is expected, token
+				 * matches and it's not a longer word,
+				 * then this is what we are looking for
+				 */
+				if ((tc & (expected | TC_WORD | TC_NEWLINE)) &&
+				*tl == *p && strncmp(p, tl, l) == 0 &&
+				!((tc & TC_WORD) && isalnum_(*(p + l)))) {
+					t.info = *ti;
+					p += l;
+					break;
+				}
+				ti++;
+				tl += l;
+			}
+
+			if (! *tl) {
+				/* it's a name (var/array/function),
+				 * otherwise it's something wrong
+				 */
+				if (! isalnum_(*p))
+					syntax_error(EMSG_UNEXP_TOKEN);
+
+				t.string = --p;
+				while(isalnum_(*(++p))) {
+					*(p-1) = *p;
+				}
+				*(p-1) = '\0';
+				tc = TC_VARIABLE;
+				if (*p == '(') {
+					tc = TC_FUNCTION;
+				} else {
+					skip_spaces(&p);
+					if (*p == '[') {
+						p++;
+						tc = TC_ARRAY;
+					}
+				}
+			}
+		}
+		pos = p;
+
+		/* skipping newlines in some cases */
+		if ((ltclass & TC_NOTERM) && (tc & TC_NEWLINE))
+			goto readnext;
+
+		/* insert concatenation operator when needed */
+		if ((ltclass&TC_CONCAT1) && (tc&TC_CONCAT2) && (expected&TC_BINOP)) {
+			concat_inserted = TRUE;
+			save_tclass = tc;
+			save_info = t.info;
+			tc = TC_BINOP;
+			t.info = OC_CONCAT | SS | P(35);
+		}
+
+		t.tclass = tc;
+	}
+	ltclass = t.tclass;
+
+	/* Are we ready for this? */
+	if (! (ltclass & expected))
+		syntax_error((ltclass & (TC_NEWLINE | TC_EOF)) ?
+								EMSG_UNEXP_EOS : EMSG_UNEXP_TOKEN);
+
+	return ltclass;
+}
+
+static void rollback_token(void) { t.rollback = TRUE; }
+
+static node *new_node(unsigned long info) {
+
+	register node *n;
+
+	n = (node *)xcalloc(sizeof(node), 1);
+	n->info = info;
+	n->lineno = lineno;
+	return n;
+}
+
+static node *mk_re_node(char *s, node *n, regex_t *re) {
+
+	n->info = OC_REGEXP;
+	n->l.re = re;
+	n->r.ire = re + 1;
+	xregcomp(re, s, REG_EXTENDED);
+	xregcomp(re+1, s, REG_EXTENDED | REG_ICASE);
+
+	return n;
+}
+
+static node *condition(void) {
+
+	next_token(TC_SEQSTART);
+	return parse_expr(TC_SEQTERM);
+}
+
+/* parse expression terminated by given argument, return ptr
+ * to built subtree. Terminator is eaten by parse_expr */
+static node *parse_expr(unsigned long iexp) {
+
+	node sn;
+	node *cn = &sn;
+	node *vn, *glptr;
+	unsigned long tc, xtc;
+	var *v;
+
+	sn.info = PRIMASK;
+	sn.r.n = glptr = NULL;
+	xtc = TC_OPERAND | TC_UOPPRE | TC_REGEXP | iexp;
+
+	while (! ((tc = next_token(xtc)) & iexp)) {
+		if (glptr && (t.info == (OC_COMPARE|VV|P(39)|2))) {
+			/* input redirection (<) attached to glptr node */
+			cn = glptr->l.n = new_node(OC_CONCAT|SS|P(37));
+			xtc = TC_OPERAND | TC_UOPPRE;
+			glptr = NULL;
+
+		} else if (tc & (TC_BINOP | TC_UOPPOST)) {
+			/* for binary and postfix-unary operators, jump back over
+			 * previous operators with higher priority */
+			vn = cn;
+			while ( ((t.info & PRIMASK) > (vn->a.n->info & PRIMASK2)) || 
+			  ((t.info == vn->info) && ((t.info & OPCLSMASK) == OC_COLON)) )
+				vn = vn->a.n;
+			if ((t.info & OPCLSMASK) == OC_TERNARY)
+				t.info += P(6);
+			cn = vn->a.n->r.n = new_node(t.info);
+			cn->a.n = vn->a.n;
+			if (tc & TC_BINOP) {
+				cn->l.n = vn;
+				xtc = TC_OPERAND | TC_UOPPRE | TC_REGEXP;
+				if ((t.info & OPCLSMASK) == OC_PGETLINE) {
+					/* it's a pipe */
+					next_token(TC_GETLINE);
+					/* give maximum priority to this pipe */
+					cn->info &= ~PRIMASK;
+					xtc = TC_OPERAND | TC_UOPPRE | TC_BINOP | iexp;
+				}
+			} else {
+				cn->r.n = vn;
+				xtc = TC_OPERAND | TC_UOPPRE | TC_BINOP | iexp;
+			}
+			vn->a.n = cn;
+
+		} else {
+			/* for operands and prefix-unary operators, attach them
+			 * to last node */
+			vn = cn;
+		  	cn = vn->r.n = new_node(t.info);
+			cn->a.n = vn;
+			xtc = TC_OPERAND | TC_UOPPRE | TC_REGEXP;
+			if (tc & (TC_OPERAND | TC_REGEXP)) {
+				xtc = TC_UOPPRE | TC_BINOP | TC_OPERAND | iexp;
+				/* one should be very careful with switch on tclass - 
+				 * only simple tclasses should be used! */
+				switch (tc) {
+				  case TC_VARIABLE:
+				  case TC_ARRAY:
+					cn->info = OC_VAR;
+				  	if ((v = hash_search(ahash, t.string)) != NULL) {
+						cn->info = OC_FNARG;
+						cn->l.i = v->x.aidx;
+					} else {
+				  		cn->l.v = newvar(t.string);
+					}
+					if (tc & TC_ARRAY) {
+						cn->info |= xS;
+						cn->r.n = parse_expr(TC_ARRTERM);
+					}
+					xtc = TC_UOPPOST | TC_UOPPRE | TC_BINOP | TC_OPERAND | iexp;
+					break;
+				  	
+				  case TC_NUMBER:
+				  case TC_STRING:
+					cn->info = OC_VAR;
+					v = cn->l.v = xcalloc(sizeof(var), 1);
+					if (tc & TC_NUMBER)
+						setvar_i(v, t.number);
+					else
+						setvar_s(v, t.string);
+					break;
+
+				  case TC_REGEXP:
+					mk_re_node(t.string, cn,
+									(regex_t *)xcalloc(sizeof(regex_t),2));
+					break;
+
+				  case TC_FUNCTION:
+				  	cn->info = OC_FUNC;
+					cn->r.f = newfunc(t.string);
+					cn->l.n = condition();
+					break;
+
+				  case TC_SEQSTART:
+					cn = vn->r.n = parse_expr(TC_SEQTERM);
+					cn->a.n = vn;
+					break;
+
+				  case TC_GETLINE:
+					glptr = cn;
+					xtc = TC_OPERAND | TC_UOPPRE | TC_BINOP | iexp;
+					break;
+
+				  case TC_BUILTIN:
+					cn->l.n = condition();
+					break;
+				}
+			}
+		}
+	}
+	return sn.r.n;
+}
+
+/* add node to chain. Return ptr to alloc'd node */
+static node *chain_node(unsigned long info) {
+
+	register node *n;
+
+	if (! seq->first)
+		seq->first = seq->last = new_node(0);
+
+	if (seq->programname != programname) {
+		seq->programname = programname;
+		n = chain_node(OC_NEWSOURCE);
+		n->l.s = xstrdup(programname);
+	}
+
+	n = seq->last;
+	n->info = info;
+	seq->last = n->a.n = new_node(OC_DONE);
+
+	return n;
+}
+
+static void chain_expr(unsigned long info) {
+
+	node *n;
+
+	n = chain_node(info);
+	n->l.n = parse_expr(TC_OPTERM | TC_GRPTERM);
+	if (t.tclass & TC_GRPTERM)
+		rollback_token();
+}
+
+static node *chain_loop(node *nn) {
+
+	node *n, *n2, *save_brk, *save_cont;
+
+	save_brk = break_ptr;
+	save_cont = continue_ptr;
+
+	n = chain_node(OC_BR | Vx);
+	continue_ptr = new_node(OC_EXEC);
+	break_ptr = new_node(OC_EXEC);
+	chain_group();
+	n2 = chain_node(OC_EXEC | Vx);
+	n2->l.n = nn;
+	n2->a.n = n;
+	continue_ptr->a.n = n2;
+	break_ptr->a.n = n->r.n = seq->last;
+
+	continue_ptr = save_cont;
+	break_ptr = save_brk;
+
+	return n;
+}
+
+/* parse group and attach it to chain */
+static void chain_group(void) {
+
+	unsigned long c;
+	node *n, *n2, *n3;
+
+	do {
+		c = next_token(TC_GRPSEQ);
+	} while (c & TC_NEWLINE);
+
+	if (c & TC_GRPSTART) {
+		while(next_token(TC_GRPSEQ | TC_GRPTERM) != TC_GRPTERM) {
+			rollback_token();
+			chain_group();
+		}
+	} else if (c & (TC_OPSEQ | TC_OPTERM)) {
+		rollback_token();
+		chain_expr(OC_EXEC | Vx);
+	} else {						/* TC_STATEMNT */
+		switch (t.info & OPCLSMASK) {
+			case ST_IF:
+				n = chain_node(OC_BR | Vx);
+				n->l.n = condition();
+				chain_group();
+				n2 = chain_node(OC_EXEC);
+				n->r.n = seq->last;
+				if (next_token(TC_GRPSEQ | TC_GRPTERM | TC_ELSE)==TC_ELSE) {
+					chain_group();
+					n2->a.n = seq->last;
+				} else {
+					rollback_token();
+				}
+				break;
+
+			case ST_WHILE:
+				n2 = condition();
+				n = chain_loop(NULL);
+				n->l.n = n2;
+				break;
+
+			case ST_DO:
+				n2 = chain_node(OC_EXEC);
+				n = chain_loop(NULL);
+				n2->a.n = n->a.n;
+				next_token(TC_WHILE);
+				n->l.n = condition();
+				break;
+
+			case ST_FOR:
+				next_token(TC_SEQSTART);
+				n2 = parse_expr(TC_SEMICOL | TC_SEQTERM);
+				if (t.tclass & TC_SEQTERM) {				/* for-in */
+					if ((n2->info & OPCLSMASK) != OC_IN)
+						syntax_error(EMSG_UNEXP_TOKEN);
+					n = chain_node(OC_WALKINIT | VV);
+					n->l.n = n2->l.n;
+					n->r.n = n2->r.n;
+					n = chain_loop(NULL);
+					n->info = OC_WALKNEXT | Vx;
+					n->l.n = n2->l.n;
+				} else {									/* for(;;) */
+					n = chain_node(OC_EXEC | Vx);
+					n->l.n = n2;
+					n2 = parse_expr(TC_SEMICOL);
+					n3 = parse_expr(TC_SEQTERM);
+					n = chain_loop(n3);
+					n->l.n = n2;
+					if (! n2)
+						n->info = OC_EXEC;
+				}
+				break;
+
+			case OC_PRINT:
+			case OC_PRINTF:
+				n = chain_node(t.info);
+				n->l.n = parse_expr(TC_OPTERM | TC_OUTRDR | TC_GRPTERM);
+				if (t.tclass & TC_OUTRDR) {
+					n->info |= t.info;
+					n->r.n = parse_expr(TC_OPTERM | TC_GRPTERM);
+				}
+				if (t.tclass & TC_GRPTERM)
+					rollback_token();
+				break;
+
+			case OC_BREAK:
+				n = chain_node(OC_EXEC);
+				n->a.n = break_ptr;
+				break;
+
+			case OC_CONTINUE:
+				n = chain_node(OC_EXEC);
+				n->a.n = continue_ptr;
+				break;
+
+			/* delete, next, nextfile, return, exit */
+			default:
+				chain_expr(t.info);
+
+		}
+	}
+}
+
+static void parse_program(char *p) {
+
+	unsigned long tclass;
+	node *cn;
+	func *f;
+	var *v;
+
+	pos = p;
+	t.lineno = 1;
+	while((tclass = next_token(TC_EOF | TC_OPSEQ | TC_GRPSTART |
+				TC_OPTERM | TC_BEGIN | TC_END | TC_FUNCDECL)) != TC_EOF) {
+
+		if (tclass & TC_OPTERM)
+			continue;
+
+		seq = &mainseq;
+		if (tclass & TC_BEGIN) {
+			seq = &beginseq;
+			chain_group();
+
+		} else if (tclass & TC_END) {
+			seq = &endseq;
+			chain_group();
+
+		} else if (tclass & TC_FUNCDECL) {
+			next_token(TC_FUNCTION);
+			pos++;
+			f = newfunc(t.string);
+			f->body.first = NULL;
+			f->nargs = 0;
+			while(next_token(TC_VARIABLE | TC_SEQTERM) & TC_VARIABLE) {
+				v = findvar(ahash, t.string);
+				v->x.aidx = (f->nargs)++;
+
+				if (next_token(TC_COMMA | TC_SEQTERM) & TC_SEQTERM)
+					break;
+			}
+			seq = &(f->body);
+			chain_group();
+			clear_array(ahash);
+
+		} else if (tclass & TC_OPSEQ) {
+			rollback_token();
+			cn = chain_node(OC_TEST);
+			cn->l.n = parse_expr(TC_OPTERM | TC_EOF | TC_GRPSTART);
+			if (t.tclass & TC_GRPSTART) {
+				rollback_token();
+				chain_group();
+			} else {
+				chain_node(OC_PRINT);
+			}
+			cn->r.n = mainseq.last;
+
+		} else /* if (tclass & TC_GRPSTART) */ {
+			rollback_token();
+			chain_group();
+		}
+	}
+}
+
+
+/* -------- program execution part -------- */
+
+static node *mk_splitter(char *s, tsplitter *spl) {
+
+	register regex_t *re, *ire;
+	node *n;
+
+	re = &spl->re[0];
+	ire = &spl->re[1];
+	n = &spl->n;
+	if ((n->info && OPCLSMASK) == OC_REGEXP) {
+		regfree(re);
+		regfree(ire);
+	}
+	if (xstrlen(s) > 1) {
+		mk_re_node(s, n, re);
+	} else {
+		n->info = (unsigned long) *s;
+	}
+
+	return n;
+}
+
+/* use node as a regular expression. Supplied with node ptr and regex_t
+ * storage space. Return ptr to regex (if result points to preg, it shuold
+ * be later regfree'd manually
+ */
+static regex_t *as_regex(node *op, regex_t *preg) {
+
+	var *v;
+	char *s;
+
+	if ((op->info & OPCLSMASK) == OC_REGEXP) {
+		return icase ? op->r.ire : op->l.re;
+	} else {
+		v = nvalloc(1);
+		s = getvar_s(evaluate(op, v));
+		xregcomp(preg, s, icase ? REG_EXTENDED | REG_ICASE : REG_EXTENDED);
+		nvfree(v);
+		return preg;
+	}
+}
+
+/* gradually increasing buffer */
+static void qrealloc(char **b, int n, int *size) {
+
+	if (! *b || n >= *size)
+		*b = xrealloc(*b, *size = n + (n>>1) + 80);
+}
+
+/* resize field storage space */
+static void fsrealloc(int size) {
+
+	static int maxfields = 0;
+	int i;
+
+	if (size >= maxfields) {
+		i = maxfields;
+		maxfields = size + 16;
+		Fields = (var *)xrealloc(Fields, maxfields * sizeof(var));
+		for (; i<maxfields; i++) {
+			Fields[i].type = VF_SPECIAL;
+			Fields[i].string = NULL;
+		}
+	}
+
+	if (size < nfields) {
+		for (i=size; i<nfields; i++) {
+			clrvar(Fields+i);
+		}
+	}
+	nfields = size;
+}
+
+static int awk_split(char *s, node *spl, char **slist) {
+
+	int l, n=0;
+	char c[4];
+	char *s1;
+	regmatch_t pmatch[2];
+
+	/* in worst case, each char would be a separate field */
+	*slist = s1 = xstrndup(s, xstrlen(s) * 2 + 3);
+
+	c[0] = c[1] = (char)spl->info;
+	c[2] = c[3] = '\0';
+	if (*getvar_s(V[RS]) == '\0') c[2] = '\n';
+
+	if ((spl->info & OPCLSMASK) == OC_REGEXP) {		/* regex split */
+		while (*s) {
+			l = strcspn(s, c+2);
+			if (regexec(icase ? spl->r.ire : spl->l.re, s, 1, pmatch, 0) == 0 &&
+			pmatch[0].rm_so <= l) {
+				l = pmatch[0].rm_so;
+				if (pmatch[0].rm_eo == 0) { l++; pmatch[0].rm_eo++; }
+			} else {
+				pmatch[0].rm_eo = l;
+				if (*(s+l)) pmatch[0].rm_eo++;
+			}
+
+			memcpy(s1, s, l);
+			*(s1+l) = '\0';
+			nextword(&s1);
+			s += pmatch[0].rm_eo;
+			n++;
+		}
+	} else if (c[0] == '\0') {		/* null split */
+		while(*s) {
+			*(s1++) = *(s++);
+			*(s1++) = '\0';
+			n++;
+		}
+	} else if (c[0] != ' ') {		/* single-character split */
+		if (icase) {
+			c[0] = toupper(c[0]);
+			c[1] = tolower(c[1]);
+		}
+		if (*s1) n++;
+		while ((s1 = strpbrk(s1, c))) {
+			*(s1++) = '\0';
+			n++;
+		}
+	} else {				/* space split */
+		while (*s) {
+			while (isspace(*s)) s++;
+			if (! *s) break;
+			n++;
+			while (*s && !isspace(*s))
+				*(s1++) = *(s++);
+			*(s1++) = '\0';
+		}
+	}
+	return n;
+}
+
+static void split_f0(void) {
+
+	static char *fstrings = NULL;
+	int i, n;
+	char *s;
+
+	if (is_f0_split)
+		return;
+
+	is_f0_split = TRUE;
+	if (fstrings) free(fstrings);
+	fsrealloc(0);
+	n = awk_split(getvar_s(V[F0]), &fsplitter.n, &fstrings);
+	fsrealloc(n);
+	s = fstrings;
+	for (i=0; i<n; i++) {
+		Fields[i].string = nextword(&s);
+		Fields[i].type |= (VF_FSTR | VF_USER | VF_DIRTY);
+	}
+
+	/* set NF manually to avoid side effects */
+	clrvar(V[NF]);
+	V[NF]->type = VF_NUMBER | VF_SPECIAL;
+	V[NF]->number = nfields;
+}
+
+/* perform additional actions when some internal variables changed */
+static void handle_special(var *v) {
+
+	int n;
+	char *b, *sep, *s;
+	int sl, l, len, i, bsize;
+
+	if (! (v->type & VF_SPECIAL))
+		return;
+
+	if (v == V[NF]) {
+		n = (int)getvar_i(v);
+		fsrealloc(n);
+
+		/* recalculate $0 */
+		sep = getvar_s(V[OFS]);
+		sl = xstrlen(sep);
+		b = NULL;
+		len = 0;
+		for (i=0; i<n; i++) {
+			s = getvar_s(&Fields[i]);
+			l = xstrlen(s);
+			if (b) {
+				memcpy(b+len, sep, sl);
+				len += sl;
+			}
+			qrealloc(&b, len+l+sl, &bsize);
+			memcpy(b+len, s, l);
+			len += l;
+		}
+		b[len] = '\0';
+		setvar_p(V[F0], b);
+		is_f0_split = TRUE;
+
+	} else if (v == V[F0]) {
+		is_f0_split = FALSE;
+
+	} else if (v == V[FS]) {
+		mk_splitter(getvar_s(v), &fsplitter);
+
+	} else if (v == V[RS]) {
+		mk_splitter(getvar_s(v), &rsplitter);
+
+	} else if (v == V[IGNORECASE]) {
+		icase = istrue(v);
+
+	} else {						/* $n */
+		n = getvar_i(V[NF]);
+		setvar_i(V[NF], n > v-Fields ? n : v-Fields+1);
+		/* right here v is invalid. Just to note... */
+	}
+}
+
+/* step through func/builtin/etc arguments */
+static node *nextarg(node **pn) {
+
+	node *n;
+
+	n = *pn;
+	if (n && (n->info & OPCLSMASK) == OC_COMMA) {
+		*pn = n->r.n;
+		n = n->l.n;
+	} else {
+		*pn = NULL;
+	}
+	return n;
+}
+
+static void hashwalk_init(var *v, xhash *array) {
+
+	char **w;
+	hash_item *hi;
+	int i;
+
+	if (v->type & VF_WALK)
+		free(v->x.walker);
+
+	v->type |= VF_WALK;
+	w = v->x.walker = (char **)xcalloc(2 + 2*sizeof(char *) + array->glen, 1);
+	*w = *(w+1) = (char *)(w + 2);
+	for (i=0; i<array->csize; i++) {
+		hi = array->items[i];
+		while(hi) {
+			strcpy(*w, hi->name);
+			nextword(w);
+			hi = hi->next;
+		}
+	}
+}
+
+static int hashwalk_next(var *v) {
+
+	char **w;
+
+	w = v->x.walker;
+	if (*(w+1) == *w)
+		return FALSE;
+
+	setvar_s(v, nextword(w+1));
+	return TRUE;
+}
+
+/* evaluate node, return 1 when result is true, 0 otherwise */
+static int ptest(node *pattern) {
+	static var v;
+
+	return istrue(evaluate(pattern, &v));
+}
+
+/* read next record from stream rsm into a variable v */
+static int awk_getline(rstream *rsm, var *v) {
+
+	char *b;
+	regmatch_t pmatch[2];
+	int p, pp=0, size;
+	int fd, so, eo, r, rp;
+	char c, *s;
+
+	/* we're using our own buffer since we need access to accumulating
+	 * characters
+	 */
+	fd = fileno(rsm->F);
+	b = rsm->buffer;
+	p = rsm->pos;
+	size = rsm->size;
+	c = (char) rsplitter.n.info;
+	rp = 0;
+	do {
+		qrealloc(&b, p+128, &size);
+		so = eo = p;
+		r = 1;
+		if (p > 0) {
+			if ((rsplitter.n.info & OPCLSMASK) == OC_REGEXP) {
+				if (regexec(icase ? rsplitter.n.r.ire : rsplitter.n.l.re,
+												b, 1, pmatch, 0) == 0) {
+					so = pmatch[0].rm_so;
+					eo = pmatch[0].rm_eo;
+					if (b[eo] != '\0')
+						break;
+				}
+			} else if (c != '\0') {
+				s = strchr(b+pp, c);
+				if (s) {
+					so = eo = s-b;
+					eo++;
+					break;
+				}
+			} else {
+				while (b[rp] == '\n')
+					rp++;
+				s = strstr(b+rp, "\n\n");
+				if (s) {
+					so = eo = s-b;
+					while (b[eo] == '\n') eo++;
+					if (b[eo] != '\0')
+						break;
+				}
+			}
+		}
+
+		pp = p;
+		p += safe_read(fd, b+p, size-p-1);
+		if (p < pp) {
+			p = 0;
+			r = 0;
+			setvar_i(V[ERRNO], errno);
+		}
+		b[p] = '\0';
+
+	} while (p > pp);
+
+	if (p == 0) {
+		r--;
+	} else {
+		c = b[so]; b[so] = '\0';
+		setvar_s(v, b+rp);
+		v->type |= VF_USER;
+		b[so] = c;
+		c = b[eo]; b[eo] = '\0';
+		setvar_s(V[RT], b+so);
+		b[eo] = c;
+	}
+
+	p -= eo;
+	if (p) memmove(b, (const void *)(b+eo), p+1);
+
+	rsm->buffer = b;
+	rsm->pos = p;
+	rsm->size = size;
+
+	return r;
+}
+
+static int fmt_num(char *b, int size, char *format, double n, int int_as_int) {
+
+	int r=0;
+	char c, *s=format;
+
+	if (int_as_int && n == (int)n) {
+		r = snprintf(b, size, "%d", (int)n);
+	} else {
+		do { c = *s; } while (*s && *++s);
+		if (strchr("diouxX", c)) {
+			r = snprintf(b, size, format, (int)n);
+		} else if (strchr("eEfgG", c)) {
+			r = snprintf(b, size, format, n);
+		} else {
+			runtime_error(EMSG_INV_FMT);
+		}
+	}
+	return r;
+}
+
+
+/* formatted output into an allocated buffer, return ptr to buffer */
+static char *awk_printf(node *n) {
+
+	char *b = NULL;
+	char *fmt, *s, *s1, *f;
+	int i, j, incr, bsize;
+	char c, c1;
+	var *v, *arg;
+
+	v = nvalloc(1);
+	fmt = f = xstrdup(getvar_s(evaluate(nextarg(&n), v)));
+
+	i = 0;
+	while (*f) {
+		s = f;
+		while (*f && (*f != '%' || *(++f) == '%'))
+			f++;
+		while (*f && !isalpha(*f)) 
+			f++;
+
+		incr = (f - s) + MAXVARFMT;
+		qrealloc(&b, incr+i, &bsize);
+		c = *f; if (c != '\0') f++;
+		c1 = *f ; *f = '\0';
+		arg = evaluate(nextarg(&n), v);
+
+		j = i;
+		if (c == 'c' || !c) {
+			i += sprintf(b+i, s,
+					is_numeric(arg) ? (char)getvar_i(arg) : *getvar_s(arg));
+
+		} else if (c == 's') {
+		    s1 = getvar_s(arg);
+			qrealloc(&b, incr+i+xstrlen(s1), &bsize);
+			i += sprintf(b+i, s, s1);
+
+		} else {
+			i += fmt_num(b+i, incr, s, getvar_i(arg), FALSE);
+		}
+		*f = c1;
+
+		/* if there was an error while sprintf, return value is negative */
+		if (i < j) i = j;
+
+	}
+
+	b = xrealloc(b, i+1);
+	free(fmt);
+	nvfree(v);
+	b[i] = '\0';
+	return b;
+}
+
+/* common substitution routine
+ * replace (nm) substring of (src) that match (n) with (repl), store
+ * result into (dest), return number of substitutions. If nm=0, replace
+ * all matches. If src or dst is NULL, use $0. If ex=TRUE, enable
+ * subexpression matching (\1-\9)
+ */
+static int awk_sub(node *rn, char *repl, int nm, var *src, var *dest, int ex) {
+
+	char *ds = NULL;
+	char *sp, *s;
+	int c, i, j, di, rl, so, eo, nbs, n, dssize;
+	regmatch_t pmatch[10];
+	regex_t sreg, *re;
+
+	re = as_regex(rn, &sreg);
+	if (! src) src = V[F0];
+	if (! dest) dest = V[F0];
+
+	i = di = 0;
+	sp = getvar_s(src);
+	rl = xstrlen(repl);
+	while (regexec(re, sp, 10, pmatch, sp==getvar_s(src) ? 0:REG_NOTBOL) == 0) {
+		so = pmatch[0].rm_so;
+		eo = pmatch[0].rm_eo;
+
+		qrealloc(&ds, di + eo + rl, &dssize);
+		memcpy(ds + di, sp, eo);
+		di += eo;
+		if (++i >= nm) {
+			/* replace */
+			di -= (eo - so);
+			nbs = 0;
+			for (s = repl; *s; s++) {
+				ds[di++] = c = *s;
+				if (c == '\\') {
+					nbs++;
+					continue;
+				}
+				if (c == '&' || (ex && c >= '0' && c <= '9')) {
+					di -= ((nbs + 3) >> 1);
+					j = 0;
+					if (c != '&') {
+						j = c - '0';
+						nbs++;
+					}
+					if (nbs % 2) {
+						ds[di++] = c;
+					} else {
+						n = pmatch[j].rm_eo - pmatch[j].rm_so;
+						qrealloc(&ds, di + rl + n, &dssize);
+						memcpy(ds + di, sp + pmatch[j].rm_so, n);
+						di += n;
+					}
+				}
+				nbs = 0;
+			}
+		}
+
+		sp += eo;
+		if (i == nm) break;
+		if (eo == so) {
+			if (! (ds[di++] = *sp++)) break;
+		}
+	}
+
+	qrealloc(&ds, di + strlen(sp), &dssize);
+	strcpy(ds + di, sp);
+	setvar_p(dest, ds);
+	if (re == &sreg) regfree(re);
+	return i;
+}
+
+static var *exec_builtin(node *op, var *res) {
+
+	int (*to_xxx)(int);
+	var *tv;
+	node *an[4];
+	var  *av[4];
+	char *as[4];
+	regmatch_t pmatch[2];
+	regex_t sreg, *re;
+	static tsplitter tspl;
+	node *spl;
+	unsigned long isr, info;
+	int nargs;
+	time_t tt;
+	char *s, *s1;
+	int i, l, ll, n;
+
+	tv = nvalloc(4);
+	isr = info = op->info;
+	op = op->l.n;
+
+	av[2] = av[3] = NULL;
+	for (i=0 ; i<4 && op ; i++) {
+		an[i] = nextarg(&op);
+		if (isr & 0x09000000) av[i] = evaluate(an[i], &tv[i]);
+		if (isr & 0x08000000) as[i] = getvar_s(av[i]);
+		isr >>= 1;
+	}
+
+	nargs = i;
+	if (nargs < (info >> 30))
+		runtime_error(EMSG_TOO_FEW_ARGS);
+
+	switch (info & OPNMASK) {
+
+	  case B_a2:
+#ifdef CONFIG_FEATURE_AWK_MATH
+		setvar_i(res, atan2(getvar_i(av[i]), getvar_i(av[1])));
+#else
+		runtime_error(EMSG_NO_MATH);
+#endif
+		break;
+
+	  case B_sp:
+		if (nargs > 2) {
+			spl = (an[2]->info & OPCLSMASK) == OC_REGEXP ?
+				an[2] : mk_splitter(getvar_s(evaluate(an[2], &tv[2])), &tspl);
+		} else {
+			spl = &fsplitter.n;
+		}
+
+		n = awk_split(as[0], spl, &s);
+		s1 = s;
+		clear_array(iamarray(av[1]));
+		for (i=1; i<=n; i++)
+			setari_u(av[1], i, nextword(&s1));
+		free(s);
+		setvar_i(res, n);
+		break;
+
+	  case B_ss:
+		l = xstrlen(as[0]);
+		i = getvar_i(av[1]) - 1;
+		if (i>l) i=l; if (i<0) i=0;
+		n = (nargs > 2) ? getvar_i(av[2]) : l-i;
+		if (n<0) n=0;
+		s = xmalloc(n+1);
+		strncpy(s, as[0]+i, n);
+		s[n] = '\0';
+		setvar_p(res, s);
+		break;
+
+	  case B_lo:
+		to_xxx = tolower;
+		goto lo_cont;
+
+	  case B_up:
+		to_xxx = toupper;
+lo_cont:
+		s1 = s = xstrdup(as[0]);
+		while (*s1) {
+			*s1 = (*to_xxx)(*s1);
+			s1++;
+		}
+		setvar_p(res, s);
+		break;
+
+	  case B_ix:
+		n = 0;
+		ll = xstrlen(as[1]);
+		l = xstrlen(as[0]) - ll;
+		if (ll > 0 && l >= 0) {
+			if (! icase) {
+				s = strstr(as[0], as[1]);
+				if (s) n = (s - as[0]) + 1;
+			} else {
+				/* this piece of code is terribly slow and
+				 * really should be rewritten
+				 */
+				for (i=0; i<=l; i++) {
+					if (strncasecmp(as[0]+i, as[1], ll) == 0) {
+						n = i+1;
+						break;
+					}
+				}
+			}
+		}
+		setvar_i(res, n);
+		break;
+
+	  case B_ti:
+		if (nargs > 1)
+			tt = getvar_i(av[1]);
+		else
+			time(&tt);
+		s = (nargs > 0) ? as[0] : "%a %b %d %H:%M:%S %Z %Y";
+		i = strftime(buf, MAXVARFMT, s, localtime(&tt));
+		buf[i] = '\0';
+		setvar_s(res, buf);
+		break;
+
+	  case B_ma:
+		re = as_regex(an[1], &sreg);
+		n = regexec(re, as[0], 1, pmatch, 0);
+		if (n == 0) {
+			pmatch[0].rm_so++;
+			pmatch[0].rm_eo++;
+		} else {
+			pmatch[0].rm_so = 0;
+			pmatch[0].rm_eo = -1;
+		}
+		setvar_i(newvar("RSTART"), pmatch[0].rm_so);
+		setvar_i(newvar("RLENGTH"), pmatch[0].rm_eo - pmatch[0].rm_so);
+		setvar_i(res, pmatch[0].rm_so);
+		if (re == &sreg) regfree(re);
+		break;
+
+	  case B_ge:
+		awk_sub(an[0], as[1], getvar_i(av[2]), av[3], res, TRUE);
+		break;
+
+	  case B_gs:
+		setvar_i(res, awk_sub(an[0], as[1], 0, av[2], av[2], FALSE));
+		break;
+
+	  case B_su:
+		setvar_i(res, awk_sub(an[0], as[1], 1, av[2], av[2], FALSE));
+		break;
+	}
+
+	nvfree(tv);
+	return res;
+}
+
+/*
+ * Evaluate node - the heart of the program. Supplied with subtree
+ * and place where to store result. returns ptr to result.
+ */
+#define XC(n) ((n) >> 8)
+
+static var *evaluate(node *op, var *res) {
+
+ 	/* This procedure is recursive so we should count every byte */
+	static var *fnargs = NULL;
+	static unsigned int seed = 1;
+	static regex_t sreg;
+	node *op1;
+	var *v1;
+	union {
+		var *v;
+		char *s;
+		double d;
+		int i;
+	} L, R;
+	unsigned long opinfo;
+	short opn;
+	union {
+		char *s;
+		rstream *rsm;
+		FILE *F;
+		var *v;
+		regex_t *re;
+		unsigned long info;
+	} X;
+
+	if (! op)
+		return setvar_s(res, NULL);
+
+	v1 = nvalloc(2);
+
+	while (op) {
+
+		opinfo = op->info;
+		opn = (short)(opinfo & OPNMASK);
+		lineno = op->lineno;
+
+ 		/* execute inevitable things */
+		op1 = op->l.n;
+		if (opinfo & OF_RES1) X.v = L.v = evaluate(op1, v1);
+		if (opinfo & OF_RES2) R.v = evaluate(op->r.n, v1+1);
+		if (opinfo & OF_STR1) L.s = getvar_s(L.v);
+		if (opinfo & OF_STR2) R.s = getvar_s(R.v);
+		if (opinfo & OF_NUM1) L.d = getvar_i(L.v);
+
+		switch (XC(opinfo & OPCLSMASK)) {
+
+		  /* -- iterative node type -- */
+
+		  /* test pattern */
+		  case XC( OC_TEST ):
+			if ((op1->info & OPCLSMASK) == OC_COMMA) {
+				/* it's range pattern */
+				if ((opinfo & OF_CHECKED) || ptest(op1->l.n)) {
+					op->info |= OF_CHECKED;
+					if (ptest(op1->r.n))
+						op->info &= ~OF_CHECKED;
+
+					op = op->a.n;
+				} else {
+					op = op->r.n;
+				}
+			} else {
+				op = (ptest(op1)) ? op->a.n : op->r.n;
+			}
+			break;
+
+		  /* just evaluate an expression, also used as unconditional jump */
+		  case XC( OC_EXEC ):
+		  	break;
+
+		  /* branch, used in if-else and various loops */
+		  case XC( OC_BR ):
+		  	op = istrue(L.v) ? op->a.n : op->r.n;
+			break;
+
+		  /* initialize for-in loop */
+		  case XC( OC_WALKINIT ):
+		  	hashwalk_init(L.v, iamarray(R.v));
+			break;
+
+		  /* get next array item */
+		  case XC( OC_WALKNEXT ):
+			op = hashwalk_next(L.v) ? op->a.n : op->r.n;
+			break;
+
+		  case XC( OC_PRINT ):
+		  case XC( OC_PRINTF ):
+			X.F = stdout;
+		  	if (op->r.n) {
+				X.rsm = newfile(R.s);
+				if (! X.rsm->F) {
+					if (opn == '|') {
+						if((X.rsm->F = popen(R.s, "w")) == NULL)
+							perror_msg_and_die("popen");
+						X.rsm->is_pipe = 1;
+					} else {
+						X.rsm->F = xfopen(R.s, opn=='w' ? "w" : "a");
+					}
+				}
+				X.F = X.rsm->F;
+			}
+
+			if ((opinfo & OPCLSMASK) == OC_PRINT) {
+		  		if (! op1) {
+					fputs(getvar_s(V[F0]), X.F);
+				} else {
+					while (op1) {
+						L.v = evaluate(nextarg(&op1), v1);
+						if (L.v->type & VF_NUMBER) {
+							fmt_num(buf, MAXVARFMT, getvar_s(V[OFMT]),
+														getvar_i(L.v), TRUE);
+							fputs(buf, X.F);
+						} else {
+							fputs(getvar_s(L.v), X.F);
+						}
+
+						if (op1) fputs(getvar_s(V[OFS]), X.F);
+					}
+				}
+				fputs(getvar_s(V[ORS]), X.F);
+
+			} else {	/* OC_PRINTF */
+				L.s = awk_printf(op1);
+				fputs(L.s, X.F);
+				free(L.s);
+			}
+			fflush(X.F);
+			break;
+
+		  case XC( OC_DELETE ):
+		  	X.info = op1->info & OPCLSMASK;
+		  	if (X.info == OC_VAR) {
+				R.v = op1->l.v;
+			} else if (X.info == OC_FNARG) {
+				R.v = &fnargs[op1->l.i];
+			} else {
+				runtime_error(EMSG_NOT_ARRAY);
+			}
+
+		  	if (op1->r.n) {
+				clrvar(L.v);
+				L.s = getvar_s(evaluate(op1->r.n, v1));
+				hash_remove(iamarray(R.v), L.s);
+			} else {
+				clear_array(iamarray(R.v));
+			}
+			break;
+
+		  case XC( OC_NEWSOURCE ):
+		  	programname = op->l.s;
+			break;
+
+		  case XC( OC_RETURN ):
+			copyvar(res, L.v);
+			break;
+
+		  case XC( OC_NEXTFILE ):
+		  	nextfile = TRUE;
+		  case XC( OC_NEXT ):
+		  	nextrec = TRUE;
+		  case XC( OC_DONE ):
+			clrvar(res);
+			break;
+
+		  case XC( OC_EXIT ):
+		  	awk_exit(L.d);
+
+		  /* -- recursive node type -- */
+
+		  case XC( OC_VAR ):
+		  	L.v = op->l.v;
+			if (L.v == V[NF])
+				split_f0();
+			goto v_cont;
+
+		  case XC( OC_FNARG ):
+		  	L.v = &fnargs[op->l.i];
+
+v_cont:
+		 	res = (op->r.n) ? findvar(iamarray(L.v), R.s) : L.v;
+			break;
+
+		  case XC( OC_IN ):
+			setvar_i(res, hash_search(iamarray(R.v), L.s) ? 1 : 0);
+			break;
+
+		  case XC( OC_REGEXP ):
+		  	op1 = op;
+			L.s = getvar_s(V[F0]);
+			goto re_cont;
+
+		  case XC( OC_MATCH ):
+		  	op1 = op->r.n;
+re_cont:
+			X.re = as_regex(op1, &sreg);
+			R.i = regexec(X.re, L.s, 0, NULL, 0);
+			if (X.re == &sreg) regfree(X.re);
+			setvar_i(res, (R.i == 0 ? 1 : 0) ^ (opn == '!' ? 1 : 0));
+			break;
+
+		  case XC( OC_MOVE ):
+		  	/* if source is a temporary string, jusk relink it to dest */
+			if (R.v == v1+1 && R.v->string) {
+				res = setvar_p(L.v, R.v->string);
+				R.v->string = NULL;
+			} else {
+		  		res = copyvar(L.v, R.v);
+			}
+			break;
+
+		  case XC( OC_TERNARY ):
+		  	if ((op->r.n->info & OPCLSMASK) != OC_COLON)
+				runtime_error(EMSG_POSSIBLE_ERROR);
+			res = evaluate(istrue(L.v) ? op->r.n->l.n : op->r.n->r.n, res);
+			break;
+
+		  case XC( OC_FUNC ):
+		  	if (! op->r.f->body.first)
+				runtime_error(EMSG_UNDEF_FUNC);
+
+			X.v = R.v = nvalloc(op->r.f->nargs+1);
+			while (op1) {
+				L.v = evaluate(nextarg(&op1), v1);
+				copyvar(R.v, L.v);
+				R.v->type |= VF_CHILD;
+				R.v->x.parent = L.v;
+				if (++R.v - X.v >= op->r.f->nargs)
+					break;
+			}
+
+			R.v = fnargs;
+			fnargs = X.v;
+
+			L.s = programname;
+			res = evaluate(op->r.f->body.first, res);
+			programname = L.s;
+
+			nvfree(fnargs);
+			fnargs = R.v;
+			break;
+
+		  case XC( OC_GETLINE ):
+		  case XC( OC_PGETLINE ):
+		  	if (op1) {
+				X.rsm = newfile(L.s);
+				if (! X.rsm->F) {
+					if ((opinfo & OPCLSMASK) == OC_PGETLINE) {
+						X.rsm->F = popen(L.s, "r");
+						X.rsm->is_pipe = TRUE;
+					} else {
+						X.rsm->F = fopen(L.s, "r");		/* not xfopen! */
+					}
+				}
+			} else {
+				if (! iF) iF = next_input_file();
+				X.rsm = iF;
+			}
+
+			if (! X.rsm->F) {
+				setvar_i(V[ERRNO], errno);
+				setvar_i(res, -1);
+				break;
+			}
+
+			if (! op->r.n)
+				R.v = V[F0];
+
+			L.i = awk_getline(X.rsm, R.v);
+			if (L.i > 0) {
+				if (! op1) {
+					incvar(V[FNR]);
+					incvar(V[NR]);
+				}
+			}
+			setvar_i(res, L.i);
+			break;
+
+   		  /* simple builtins */
+		  case XC( OC_FBLTIN ):
+		  	switch (opn) {
+
+			  case F_in:
+			  	R.d = (int)L.d;
+				break;
+
+			  case F_rn:
+			  	R.d =  (double)rand() / (double)RAND_MAX;
+				break;
+
+#ifdef CONFIG_FEATURE_AWK_MATH
+			  case F_co:
+			  	R.d = cos(L.d);
+				break;
+
+			  case F_ex:
+			  	R.d = exp(L.d);
+				break;
+
+			  case F_lg:
+			  	R.d = log(L.d);
+				break;
+
+			  case F_si:
+			  	R.d = sin(L.d);
+				break;
+
+			  case F_sq:
+			  	R.d = sqrt(L.d);
+				break;
+#else
+			  case F_co:
+			  case F_ex:
+			  case F_lg:
+			  case F_si:
+			  case F_sq:
+				runtime_error(EMSG_NO_MATH);
+				break;
+#endif
+
+			  case F_sr:
+				R.d = (double)seed;
+				seed = op1 ? (unsigned int)L.d : (unsigned int)time(NULL);
+				srand(seed);
+				break;
+
+			  case F_ti:
+				R.d = time(NULL);
+				break;
+
+			  case F_le:
+			  	if (! op1)
+					L.s = getvar_s(V[F0]);
+				R.d = xstrlen(L.s);
+				break;
+
+			  case F_sy:
+				fflush(NULL);
+				R.d = (L.s && *L.s) ? system(L.s) : 0;
+				break;
+
+			  case F_ff:
+				if (! op1)
+					fflush(stdout);
+				else {
+					if (L.s && *L.s) {
+						X.rsm = newfile(L.s);
+						fflush(X.rsm->F);
+					} else {
+						fflush(NULL);
+					}
+				}
+				break;
+
+			  case F_cl:
+				X.rsm = (rstream *)hash_search(fdhash, L.s);
+				if (X.rsm) {
+					R.i = X.rsm->is_pipe ? pclose(X.rsm->F) : fclose(X.rsm->F);
+					if (X.rsm->buffer)
+						free(X.rsm->buffer);
+					hash_remove(fdhash, L.s);
+				}
+				if (R.i != 0)
+					setvar_i(V[ERRNO], errno);
+				R.d = (double)R.i;
+				break;
+			}
+			setvar_i(res, R.d);
+			break;
+
+		  case XC( OC_BUILTIN ):
+			res = exec_builtin(op, res);
+			break;
+
+		  case XC( OC_SPRINTF ):
+		  	setvar_p(res, awk_printf(op1));
+			break;
+
+		  case XC( OC_UNARY ):
+		  	X.v = R.v;
+		  	L.d = R.d = getvar_i(R.v);
+		  	switch (opn) {
+			  case 'P':
+			  	L.d = ++R.d;
+				goto r_op_change;
+			  case 'p':
+			  	R.d++;
+				goto r_op_change;
+			  case 'M':
+			  	L.d = --R.d;
+				goto r_op_change;
+			  case 'm':
+			  	R.d--;
+				goto r_op_change;
+			  case '!':
+			    L.d = istrue(X.v) ? 0 : 1;
+				break;
+			  case '-':
+			  	L.d = -R.d;
+				break;
+			r_op_change:
+				setvar_i(X.v, R.d);
+			}
+			setvar_i(res, L.d);
+			break;
+
+		  case XC( OC_FIELD ):
+		  	R.i = (int)getvar_i(R.v);
+		  	if (R.i == 0) {
+				res = V[F0];
+			} else {
+				split_f0();
+				if (R.i > nfields)
+					fsrealloc(R.i);
+
+				res = &Fields[R.i-1];
+			}
+			break;
+
+		  /* concatenation (" ") and index joining (",") */
+		  case XC( OC_CONCAT ):
+		  case XC( OC_COMMA ):
+			opn = xstrlen(L.s) + xstrlen(R.s) + 2;
+		  	X.s = (char *)xmalloc(opn);
+			strcpy(X.s, L.s);
+			if ((opinfo & OPCLSMASK) == OC_COMMA) {
+				L.s = getvar_s(V[SUBSEP]);
+				X.s = (char *)xrealloc(X.s, opn + xstrlen(L.s));
+				strcat(X.s, L.s);
+			}
+			strcat(X.s, R.s);
+			setvar_p(res, X.s);
+			break;
+
+		  case XC( OC_LAND ):
+			setvar_i(res, istrue(L.v) ? ptest(op->r.n) : 0);
+			break;
+
+		  case XC( OC_LOR ):
+			setvar_i(res, istrue(L.v) ? 1 : ptest(op->r.n));
+			break;
+
+		  case XC( OC_BINARY ):
+		  case XC( OC_REPLACE ):
+		  	R.d = getvar_i(R.v);
+			switch (opn) {
+			  case '+':
+			  	L.d += R.d;
+				break;
+			  case '-':
+			  	L.d -= R.d;
+				break;
+			  case '*':
+			  	L.d *= R.d;
+				break;
+			  case '/':
+			  	if (R.d == 0) runtime_error(EMSG_DIV_BY_ZERO);
+			  	L.d /= R.d;
+				break;
+			  case '&':
+#ifdef CONFIG_FEATURE_AWK_MATH
+			  	L.d = pow(L.d, R.d);
+#else
+				runtime_error(EMSG_NO_MATH);
+#endif
+				break;
+			  case '%':
+			  	if (R.d == 0) runtime_error(EMSG_DIV_BY_ZERO);
+			  	L.d -= (int)(L.d / R.d) * R.d;
+				break;
+			}
+			res = setvar_i(((opinfo&OPCLSMASK) == OC_BINARY) ? res : X.v, L.d);
+			break;
+
+		  case XC( OC_COMPARE ):
+			if (is_numeric(L.v) && is_numeric(R.v)) {
+				L.d = getvar_i(L.v) - getvar_i(R.v);
+			} else {
+				L.s = getvar_s(L.v);
+				R.s = getvar_s(R.v);
+				L.d = icase ? strcasecmp(L.s, R.s) : strcmp(L.s, R.s);
+			}
+			switch (opn & 0xfe) {
+			  case 0:
+			  	R.i = (L.d > 0);
+				break;
+			  case 2:
+			  	R.i = (L.d >= 0);
+				break;
+			  case 4:
+			  	R.i = (L.d == 0);
+				break;
+			}
+			setvar_i(res, (opn & 0x1 ? R.i : !R.i) ? 1 : 0);
+			break;
+
+		  default:
+		  	runtime_error(EMSG_POSSIBLE_ERROR);
+		}
+		if ((opinfo & OPCLSMASK) <= SHIFT_TIL_THIS)
+			op = op->a.n;
+		if ((opinfo & OPCLSMASK) >= RECUR_FROM_THIS)
+			break;
+		if (nextrec)
+			break;
+	}
+	nvfree(v1);
+	return res;
+}
+
+
+/* -------- main & co. -------- */
+
+static int awk_exit(int r) {
+
+	unsigned int i;
+	hash_item *hi;
+
+	/* waiting for children */
+	for (i=0; i<fdhash->csize; i++) {
+		hi = fdhash->items[i];
+		while(hi) {
+			if (hi->data.rs.F && hi->data.rs.is_pipe)
+				pclose(hi->data.rs.F);
+			hi = hi->next;
+		}
+	}
+
+	exit(r);
+}
+
+/* if expr looks like "var=value", perform assignment and return 1,
+ * otherwise return 0 */
+static int is_assignment(char *expr) {
+
+	char *exprc, *s, *s0, *s1;
+
+	exprc = xstrdup(expr);
+	if (!isalnum_(*exprc) || (s = strchr(exprc, '=')) == NULL) {
+		free(exprc);
+		return FALSE;
+	}
+
+	*(s++) = '\0';
+	s0 = s1 = s;
+	while (*s)
+		*(s1++) = nextchar(&s);
+
+	*s1 = '\0';
+	setvar_u(newvar(exprc), s0);
+	free(exprc);
+	return TRUE;
+}
+
+/* switch to next input file */
+static rstream *next_input_file(void) {
+
+	static rstream rsm;
+	FILE *F = NULL;
+	char *fname, *ind;
+	static int files_happen = FALSE;
+
+	if (rsm.F) fclose(rsm.F);
+	rsm.F = NULL;
+	rsm.pos = 0;
+
+	do {
+		if (getvar_i(V[ARGIND])+1 >= getvar_i(V[ARGC])) {
+			if (files_happen)
+				return NULL;
+			fname = "-";
+			F = stdin;
+		} else {
+			ind = getvar_s(incvar(V[ARGIND]));
+			fname = getvar_s(findvar(iamarray(V[ARGV]), ind));
+			if (fname && *fname && !is_assignment(fname))
+				F = afopen(fname, "r");
+		}
+	} while (!F);
+
+	files_happen = TRUE;
+	setvar_s(V[FILENAME], fname);
+	rsm.F = F;
+	return &rsm;
+}
+
+extern int awk_main(int argc, char **argv) {
+
+	char *s, *s1;
+	int i, j, c;
+	var *v;
+	static var tv;
+	char **envp;
+	static int from_file = FALSE;
+	rstream *rsm;
+	FILE *F, *stdfiles[3];
+	static char * stdnames = "/dev/stdin\0/dev/stdout\0/dev/stderr";
+
+	/* allocate global buffer */
+	buf = xmalloc(MAXVARFMT+1);
+
+	vhash = hash_init();
+	ahash = hash_init();
+	fdhash = hash_init();
+	fnhash = hash_init();
+
+	/* initialize variables */
+	for (i=0;  *vNames;  i++) {
+		V[i] = v = newvar(nextword(&vNames));
+		if (*vValues != '\377')
+			setvar_s(v, nextword(&vValues));
+		else
+			setvar_i(v, 0);
+
+		if (*vNames == '*') {
+			v->type |= VF_SPECIAL;
+			vNames++;
+		}
+	}
+
+	handle_special(V[FS]);
+	handle_special(V[RS]);
+
+	stdfiles[0] = stdin;
+	stdfiles[1] = stdout;
+	stdfiles[2] = stderr;
+	for (i=0; i<3; i++) {
+		rsm = newfile(nextword(&stdnames));
+		rsm->F = stdfiles[i];
+	}
+
+	for (envp=environ; *envp; envp++) {
+		s = xstrdup(*envp);
+		s1 = strchr(s, '=');
+		*(s1++) = '\0';
+		setvar_u(findvar(iamarray(V[ENVIRON]), s), s1);
+		free(s);
+	}
+
+	while((c = getopt(argc, argv, "F:v:f:W:")) != EOF) {
+		switch (c) {
+			case 'F':
+				setvar_s(V[FS], optarg);
+				break;
+			case 'v':
+				if (! is_assignment(optarg))
+					show_usage();
+				break;
+			case 'f':
+				from_file = TRUE;
+				F = afopen(programname = optarg, "r");
+				s = NULL;
+				/* one byte is reserved for some trick in next_token */
+				for (i=j=1; j>0; i+=j) {
+					s = (char *)xrealloc(s, i+4096);
+					j = fread(s+i, 1, 4094, F);
+				}
+				s[i] = '\0';
+				fclose(F);
+				parse_program(s+1);
+				free(s);
+				break;
+			case 'W':
+				fprintf(stderr, "Warning: unrecognized option '-W %s' ignored\n", optarg);
+				break;
+
+			default:
+				show_usage();
+		}
+	}
+
+	if (!from_file) {
+		if (argc == optind)
+			show_usage();
+		programname="cmd. line";
+		parse_program(argv[optind++]);
+
+	}
+
+	/* fill in ARGV array */
+	setvar_i(V[ARGC], argc - optind + 1);
+	setari_u(V[ARGV], 0, "awk");
+	for(i=optind; i < argc; i++)
+		setari_u(V[ARGV], i+1-optind, argv[i]);
+
+	evaluate(beginseq.first, &tv);
+	if (! mainseq.first && ! endseq.first)
+		awk_exit(EXIT_SUCCESS);
+
+	/* input file could already be opened in BEGIN block */
+	if (! iF) iF = next_input_file();
+
+	/* passing through input files */
+	while (iF) {
+
+		nextfile = FALSE;
+		setvar_i(V[FNR], 0);
+
+		while ((c = awk_getline(iF, V[F0])) > 0) {
+
+			nextrec = FALSE;
+			incvar(V[NR]);
+			incvar(V[FNR]);
+			evaluate(mainseq.first, &tv);
+
+			if (nextfile)
+				break;
+		}
+
+		if (c < 0)
+			runtime_error(strerror(errno));
+
+		iF = next_input_file();
+
+	}
+
+	evaluate(endseq.first, &tv);
+	awk_exit(EXIT_SUCCESS);
+
+	return 0;
+}
+