port/fp/file_decim.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (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 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident   "%Z%%M% %I% %E% SMI"

#include "lint.h"
#include "file64.h"
#include "mtlib.h"
#include <sys/types.h>
#include <ctype.h>
#include <stdio.h>
#include "base_conversion.h"
#include <locale.h>
#include <thread.h>
#include <synch.h>
#include "stdiom.h"
#include "libc.h"

/* if the _IOWRT flag is set, this must be a call from sscanf */
#define mygetc(iop) ((iop->_flag & _IOWRT) ? \
                ((*iop->_ptr == '\0') ? EOF : *iop->_ptr++) : \
                GETC(iop))

#define myungetc(x, iop)    ((iop->_flag & _IOWRT) ? *(--iop->_ptr) : \
                    UNGETC(x, iop))


void
file_to_decimal(char **ppc, int nmax, int fortran_conventions,
        decimal_record *pd, enum decimal_string_form *pform,
        char **pechar, FILE *pf, int *pnread)
{
    char    *cp = *ppc - 1; /* last character seen */
    char    *good = cp; /* last character accepted */
    int current;    /* *cp or EOF */
    int nread = 0;  /* number of characters read so far */

/* if the _IOWRT flag is set, this must be a call from sscanf */
#define NEXT \
    if (nread < nmax) { \
        current = ((pf->_flag & _IOWRT) ? \
            ((*pf->_ptr == '\0') ? EOF : *pf->_ptr++) : \
            GETC(pf)); \
        if (current != EOF) { \
            *++cp = (char)current; \
            nread++; \
        } \
    } else { \
        current = EOF; \
    }

    NEXT;

#include "char_to_decimal.h"

    /*
     * If we read any characters beyond the end of the accepted
     * token, try to push them back.
     */
    if (fortran_conventions < 0) {
        /* in C99 mode, push back at most one character */
        if (cp >= *ppc && current != EOF && myungetc(current, pf)
            != EOF) {
            cp--;
            nread--;
        }
    } else {
        while (cp >= *ppc) {
            if (myungetc((int)(unsigned char)*cp, pf) == EOF)
                break;
            cp--;
            nread--;
        }
    }

    *++cp = '\0';
    *pnread = nread;
}