/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*        All Rights Reserved   */

#include <stdio.h>
#include "awk.def"
#include "awk.h"
#include <ctype.h>
#include <wctype.h>
#include "awktype.h"
#include <stdlib.h>
#include <stdarg.h>

FILE    *infile = NULL;
wchar_t *file;
#define RECSIZE (5 * 512)
wchar_t record[RECSIZE];
wchar_t fields[RECSIZE];
wchar_t L_NULL[] = L"";


#define MAXFLD  100
int     donefld;        /* 1 = implies rec broken into fields */
int     donerec;        /* 1 = record is valid (no flds have changed) */
int     mustfld;        /* 1 = NF seen, so always break */
static wchar_t L_record[] = L"$record";


#define FINIT   { OCELL, CFLD, 0, L_NULL, 0.0, FLD|STR }
CELL fldtab[MAXFLD] = {         /* room for fields */
        { OCELL, CFLD, L_record, record, 0.0, STR|FLD},
                FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT,
        FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT,
        FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT,
        FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT,
        FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT,
        FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT,
        FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT,
        FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT,
        FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT,
        FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT, FINIT
};
int     maxfld  = 0;    /* last used field */
/* pointer to CELL for maximum field assigned to */
CELL    *maxmfld = &fldtab[0];

static int isclvar(wchar_t *);
static void setclvar(wchar_t *);
void fldbld(void);

int
getrec(void)
{
        wchar_t *rr, *er;
        int c, sep;
        FILE *inf;
        extern int svargc;
        extern wchar_t **svargv;


        dprintf("**RS=%o, **FS=%o\n", **RS, **FS, NULL);
        donefld = 0;
        donerec = 1;
        record[0] = 0;
        er = record + RECSIZE;
        while (svargc > 0) {
                dprintf("svargc=%d, *svargv=%ws\n", svargc, *svargv, NULL);
                if (infile == NULL) {   /* have to open a new file */
                        /*
                         * If the argument contains a '=', determine if the
                         * argument needs to be treated as a variable assignment
                         * or as the pathname of a file.
                         */
                        if (isclvar(*svargv)) {
                                /* it's a var=value argument */
                                setclvar(*svargv);
                                if (svargc > 1) {
                                        svargv++;
                                        svargc--;
                                        continue;
                                }
                                *svargv = L"-";
                        }
                        *FILENAME = file = *svargv;
                        dprintf("opening file %ws\n", file, NULL, NULL);
                        if (*file == (wchar_t)L'-')
                                infile = stdin;
                        else if ((infile = fopen(toeuccode(file), "r")) == NULL)
                                error(FATAL, "can't open %ws", file);
                }
                if ((sep = **RS) == 0)
                        sep = '\n';
                inf = infile;
                for (rr = record; /* dummy */; /* dummy */) {
                        for (; (c = getwc(inf)) != sep && c != EOF && rr < er;
                            *rr++ = c)
                                ;
                        if (rr >= er)
                                error(FATAL, "record `%.20ws...' too long",
                                    record);
                        if (**RS == sep || c == EOF)
                                break;
                        if ((c = getwc(inf)) == '\n' || c == EOF)
                        /* 2 in a row */
                                break;
                        *rr++ = '\n';
                        *rr++ = c;
                }
                if (rr >= er)
                        error(FATAL, "record `%.20ws...' too long", record);
                *rr = 0;
                if (mustfld)
                        fldbld();
                if (c != EOF || rr > record) {  /* normal record */
                        recloc->tval &= ~NUM;
                        recloc->tval |= STR;
                        ++nrloc->fval;
                        nrloc->tval &= ~STR;
                        nrloc->tval |= NUM;
                        return (1);
                }
                /* EOF arrived on this file; set up next */
                if (infile != stdin)
                        fclose(infile);
                infile = NULL;
                svargc--;
                svargv++;
        }
        return (0);     /* true end of file */
}

/*
 * isclvar()
 *
 * Returns 1 if the input string, arg, is a variable assignment,
 * otherwise returns 0.
 *
 * An argument to awk can be either a pathname of a file, or a variable
 * assignment.  An operand that begins with an undersore or alphabetic
 * character from the portable character set, followed by a sequence of
 * underscores, digits, and alphabetics from the portable character set,
 * followed by the '=' character, shall specify a variable assignment
 * rather than a pathname.
 */
static int
isclvar(wchar_t *arg)
{
        wchar_t *tmpptr = arg;

        if (tmpptr != NULL) {

                /* Begins with an underscore or alphabetic character */
                if (iswalpha(*tmpptr) || *tmpptr == '_') {

                        /*
                         * followed by a sequence of underscores, digits,
                         * and alphabetics
                         */
                        for (tmpptr++; *tmpptr; tmpptr++) {
                                if (!(iswalnum(*tmpptr) || (*tmpptr == '_'))) {
                                        break;
                                }
                        }
                        return (*tmpptr == '=');
                }
        }

        return (0);
}

static void
setclvar(wchar_t *s)    /* set var=value from s */
{
        wchar_t *p;
        CELL *q;


        for (p = s; *p != '='; p++)
                ;
        *p++ = 0;
        q = setsymtab(s, tostring(p), 0.0, STR, symtab);
        setsval(q, p);
        dprintf("command line set %ws to |%ws|\n", s, p, NULL);
}


void
fldbld(void)
{
        wchar_t *r, *fr, sep, c;
        static wchar_t L_NF[] = L"NF";
        CELL *p, *q;
        int i, j;


        r = record;
        fr = fields;
        i = 0;  /* number of fields accumulated here */
        if ((sep = **FS) == ' ')
                for (i = 0; /* dummy */; /* dummy */) {
                        c = *r;
                        while (iswblank(c) || c == '\t' || c == '\n')
                                c = *(++r);
                        if (*r == 0)
                                break;
                        i++;
                        if (i >= MAXFLD)
                                error(FATAL,
                        "record `%.20ws...' has too many fields", record);
                        if (!(fldtab[i].tval&FLD))
                                xfree(fldtab[i].sval);
                        fldtab[i].sval = fr;
                        fldtab[i].tval = FLD | STR;
                        do {
                                *fr++ = *r++;
                                c = *r;
                        } while (! iswblank(c) && c != '\t' &&
                            c != '\n' && c != '\0');


                        *fr++ = 0;

        } else if (*r != 0)     /* if 0, it's a null field */
                for (;;) {
                        i++;
                        if (i >= MAXFLD)
                                error(FATAL,
                        "record `%.20ws...' has too many fields", record);
                        if (!(fldtab[i].tval&FLD))
                                xfree(fldtab[i].sval);
                        fldtab[i].sval = fr;
                        fldtab[i].tval = FLD | STR;
                        while ((c = *r) != sep && c != '\n' && c != '\0')
                                /* \n always a separator */
                                *fr++ = *r++;
                        *fr++ = 0;
                        if (*r++ == 0)
                                break;
                }
        *fr = 0;
        /* clean out junk from previous record */
        for (p = maxmfld, q = &fldtab[i]; p > q; p--) {
                if (!(p->tval&FLD))
                        xfree(p->sval);
                p->tval = STR | FLD;
                p->sval = L_NULL;
        }
        maxfld = i;
        maxmfld = &fldtab[i];
        donefld = 1;
        for (i = 1; i <= maxfld; i++)
                if (isanumber(fldtab[i].sval)) {
                        fldtab[i].fval = watof(fldtab[i].sval);
                        fldtab[i].tval |= NUM;
                }
        setfval(lookup(L_NF, symtab, 0), (awkfloat) maxfld);
        if (dbg)
                for (i = 0; i <= maxfld; i++)
                        printf("field %d: |%ws|\n", i, fldtab[i].sval);
}


void
recbld(void)
{
        int i;
        wchar_t *r, *p;


        if (donefld == 0 || donerec == 1)
                return;
        r = record;
        for (i = 1; i <= *NF; i++) {
                p = getsval(&fldtab[i]);
                while (*r++ = *p++)
                        ;
                *(r-1) = **OFS;
        }
        *(r-1) = '\0';
        dprintf("in recbld FS=%o, recloc=%o\n", **FS, recloc, NULL);
        recloc->tval = STR | FLD;
        dprintf("in recbld FS=%o, recloc=%o\n", **FS, recloc, NULL);
        if (r > record+RECSIZE)
                error(FATAL, "built giant record `%.20ws...'", record);
        dprintf("recbld = |%ws|\n", record, NULL, NULL);
}


CELL *
fieldadr(int n)
{
        if (n < 0 || n >= MAXFLD)
                error(FATAL, "trying to access field %d", n);
        return (&fldtab[n]);
}


int     errorflag       = 0;


int
yyerror(char *s)
{
        fprintf(stderr,
            gettext("awk: %s near line %lld\n"), gettext(s), lineno);
        errorflag = 2;
        return (0);
}


void
error(int f, char *fmt, ...)
{
        va_list ap;

        va_start(ap, fmt);
        fprintf(stderr, "awk: ");
        vfprintf(stderr, gettext(fmt), ap);
        va_end(ap);
        fprintf(stderr, "\n");
        if (NR && *NR > 0)
                fprintf(stderr, gettext(" record number %g\n"), *NR);
        if (f)
                exit(2);
}


void
PUTS(char *s)
{
        dprintf("%s\n", s, NULL, NULL);
}


#define MAXEXPON        38      /* maximum exponenet for fp number */


int
isanumber(wchar_t *s)
{
        int d1, d2;
        int point;
        wchar_t *es;
        extern wchar_t  radixpoint;

        d1 = d2 = point = 0;
        while (*s == ' ' || *s == '\t' || *s == '\n')
                s++;
        if (*s == '\0')
                return (0);     /* empty stuff isn't number */
        if (*s == '+' || *s == '-')
                s++;
        /*
         * Since, iswdigit() will include digit from other than code set 0,
         * we have to check it from code set 0 or not.
         */
        if (!(iswdigit(*s) && iswascii(*s)) && *s != radixpoint)
                return (0);
        if (iswdigit(*s) && iswascii(*s)) {
                do {
                        d1++;
                        s++;
                } while (iswdigit(*s) && iswascii(*s));
        }
        if (d1 >= MAXEXPON)
                return (0);     /* too many digits to convert */
        if (*s == radixpoint) {
                point++;
                s++;
        }
        if (iswdigit(*s) && iswascii(*s)) {
                d2++;
                do {
                        s++;
                } while (iswdigit(*s) && iswascii(*s));
        }


        if (!(d1 || point && d2))
                return (0);
        if (*s == 'e' || *s == 'E') {
                s++;
                if (*s == '+' || *s == '-')
                        s++;
                if (!(iswdigit(*s) && iswascii(*s)))
                        return (0);
                es = s;
                do {
                        s++;
                } while (iswdigit(*s) && iswascii(*s));


                if (s - es > 2)
                        return (0);
                else if (s - es == 2 &&
                    10 * (*es-'0') + *(es+1)-'0' >= MAXEXPON)
                        return (0);
        }
        while (*s == ' ' || *s == '\t' || *s == '\n')
                s++;
        if (*s == '\0')
                return (1);
        else
                return (0);
}
char *
toeuccode(str)
wchar_t *str;
{
        static char euccode[RECSIZE];

        (void) wcstombs(euccode, str, RECSIZE);
        return (euccode);
}