/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1987, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>

#include "ctags.h"

static void takeprec(void);

char *lbp;                              /* line buffer pointer */

bool
PF_funcs(void)
{
        bool    pfcnt;                  /* pascal/fortran functions found */
        char    *cp;
        char    tok[MAXTOKEN];

        for (pfcnt = false;;) {
                lineftell = ftell(inf);
                if (!fgets(lbuf, sizeof(lbuf), inf))
                        return (pfcnt);
                ++lineno;
                lbp = lbuf;
                if (*lbp == '%')        /* Ratfor escape to fortran */
                        ++lbp;
                for (; isspace(*lbp); ++lbp)
                        continue;
                if (!*lbp)
                        continue;
                switch (*lbp | ' ') {   /* convert to lower-case */
                case 'c':
                        if (cicmp("complex") || cicmp("character"))
                                takeprec();
                        break;
                case 'd':
                        if (cicmp("double")) {
                                for (; isspace(*lbp); ++lbp)
                                        continue;
                                if (!*lbp)
                                        continue;
                                if (cicmp("precision"))
                                        break;
                                continue;
                        }
                        break;
                case 'i':
                        if (cicmp("integer"))
                                takeprec();
                        break;
                case 'l':
                        if (cicmp("logical"))
                                takeprec();
                        break;
                case 'r':
                        if (cicmp("real"))
                                takeprec();
                        break;
                }
                for (; isspace(*lbp); ++lbp)
                        continue;
                if (!*lbp)
                        continue;
                switch (*lbp | ' ') {
                case 'f':
                        if (cicmp("function"))
                                break;
                        continue;
                case 'p':
                        if (cicmp("program") || cicmp("procedure"))
                                break;
                        continue;
                case 's':
                        if (cicmp("subroutine"))
                                break;
                default:
                        continue;
                }
                for (; isspace(*lbp); ++lbp)
                        continue;
                if (!*lbp)
                        continue;
                for (cp = lbp + 1; *cp && intoken(*cp); ++cp)
                        continue;
                if (cp == lbp + 1)
                        continue;
                *cp = EOS;
                (void)strlcpy(tok, lbp, sizeof(tok));   /* possible trunc */
                get_line();                     /* process line for ex(1) */
                pfnote(tok, lineno);
                pfcnt = true;
        }
        /*NOTREACHED*/
}

/*
 * cicmp --
 *      do case-independent strcmp
 */
bool
cicmp(const char *cp)
{
        int     len;
        char    *bp;

        for (len = 0, bp = lbp; *cp && (*cp &~ ' ') == (*bp++ &~ ' ');
            ++cp, ++len)
                continue;
        if (!*cp) {
                lbp += len;
                return (true);
        }
        return (false);
}

static void
takeprec(void)
{
        for (; isspace(*lbp); ++lbp)
                continue;
        if (*lbp == '*') {
                for (++lbp; isspace(*lbp); ++lbp)
                        continue;
                if (!isdigit(*lbp))
                        --lbp;                  /* force failure */
                else
                        while (isdigit(*++lbp))
                                continue;
        }
}