InterCD 2000 September/september_2000.iso/intercd/root/^Linux/cdrecord-1.8.1/misc/io.c

C/C++ Source or Header | 1999-12-24 | 5.1 KB | 219 lines

/* @(#)io.c    1.19 98/10/10 Copyright 1988 J. Schilling */
#ifndef lint
static    char sccsid[] =
    "@(#)io.c    1.19 98/10/10 Copyright 1988 J. Schilling";
#endif
/*
 *    Copyright (c) 1988 J. Schilling
 */
/*
 * 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, 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; see the file COPYING.  If not, write to
 * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include <mconfig.h>
#include <stdio.h>
#include <standard.h>
#include <ctype.h>
#include <vadefs.h>
#include <stdxlib.h>
#include <strdefs.h>
#include <utypes.h>

struct disk {
    int    dummy;
};

LOCAL    char    *skipwhite    __PR((const char *));
LOCAL    void    prt_std        __PR((char *, long, long, long, struct disk *));
EXPORT    BOOL    cvt_std        __PR((char *, long *, long, long, struct disk *));
extern    BOOL    getvalue    __PR((char *, long *, long, long,
                void (*)(char *, long, long, long, struct disk *),
                BOOL (*)(char *, long *, long, long, struct disk *),
                struct disk *));
extern    BOOL    getlong        __PR((char *, long *, long, long));
extern    BOOL    getint        __PR((char *, int *, int, int));
extern    BOOL    yes        __PR((char *, ...));

LOCAL
char *skipwhite(s)
         const char    *s;
{
    register const Uchar    *p = (const Uchar *)s;

    while (*p) {
        if (!isspace(*p))
            break;
        p++;
    }
    return ((char *)p);
}

/* ARGSUSED */
EXPORT
BOOL
cvt_std(linep, lp, mini, maxi, dp)
    char    *linep;
    long    *lp;
    long    mini;
    long    maxi;
    struct disk    *dp;
{
    long    l    = -1L;

/*    printf("cvt_std(\"%s\", %d, %d, %d);\n", linep, *lp, mini, maxi);*/

    if (linep[0] == '?') {
        printf("Enter a number in the range from %ld to %ld\n",
                                mini, maxi);
        printf("The default radix is 10\n");
        printf("Precede number with '0x' for hexadecimal or with '0' for octal\n");
        printf("Shorthands are:\n");
        printf("\t'^' for minimum value (%ld)\n", mini);
        printf("\t'$' for maximum value (%ld)\n", maxi);
        printf("\t'+' for incrementing value to %ld\n", *lp + 1);
        printf("\t'-' for decrementing value to %ld\n", *lp - 1);
        return (FALSE);
    }
    if (linep[0] == '^' && *skipwhite(&linep[1]) == '\0') {
        l = mini;
    } else if (linep[0] == '$' && *skipwhite(&linep[1]) == '\0') {
        l = maxi;
    } else if (linep[0] == '+' && *skipwhite(&linep[1]) == '\0') {
        if (*lp < maxi)
            l = *lp + 1;
    } else if (linep[0] == '-' && *skipwhite(&linep[1]) == '\0') {
        if (*lp > mini)
            l = *lp - 1;
    } else if (*astol(linep, &l)) {
        printf("Not a number: '%s'.\n", linep);
        return (FALSE);
    }
    if (l < mini || l > maxi) {
        printf("'%s' is out of range.\n", linep);
        return (FALSE);
    }
    *lp = l;
    return (TRUE);
}

/* ARGSUSED */
LOCAL void
prt_std(s, l, mini, maxi, dp)
    char    *s;
    long    l;
    long    mini;
    long    maxi;
    struct disk *dp;
{
    printf("%s %ld (%ld - %ld)/<cr>:", s, l, mini, maxi);
}

EXPORT
BOOL getvalue(s, lp, mini, maxi, prt, cvt, dp)
    char    *s;
    long    *lp;
    long    mini;
    long    maxi;
    void    (*prt) __PR((char *, long, long, long, struct disk *));
    BOOL    (*cvt) __PR((char *, long *, long, long, struct disk *));
    struct disk    *dp;
{
    char    line[128];
    char    *linep;

    for(;;) {
        (*prt)(s, *lp, mini, maxi, dp);
        flush();
        line[0] = '\0';
        if (getline(line, 80) == EOF)
            exit(EX_BAD);

        linep = skipwhite(line);
        /*
         * Nicht initialisierte Variablen
         * duerfen nicht uebernommen werden
         */
        if (linep[0] == '\0' && *lp != -1L)
            return (FALSE);

        if (strlen(linep) == 0) {
            /* Leere Eingabe */
        } else if ((*cvt)(linep, lp, mini, maxi, dp))
            return (TRUE);
    }
    /* NOTREACHED */
}

EXPORT
BOOL getlong(s, lp, mini, maxi)
    char    *s;
    long    *lp;
    long    mini;
    long    maxi;
{
    return (getvalue(s, lp, mini, maxi, prt_std, cvt_std, (void *)0));
}

EXPORT
BOOL getint(s, ip, mini, maxi)
    char    *s;
    int    *ip;
    int    mini;
    int    maxi;
{
    long    l = *ip;
    BOOL    ret;

    ret = getlong(s, &l, (long)mini, (long)maxi);
    *ip = l;
    return (ret);
}

/* VARARGS1 */
#ifdef    PROTOTYPES
EXPORT BOOL yes(char *form, ...)
#else
EXPORT
BOOL yes(form, va_alist)
    char    *form;
    va_dcl
#endif
{
    va_list    args;
    char okbuf[10];

again:
#ifdef    PROTOTYPES
    va_start(args, form);
#else
    va_start(args);
#endif
    printf("%r", form, args);
    va_end(args);
    flush();
    if (getline(okbuf, sizeof(okbuf)) == EOF)
        exit(EX_BAD);
    if (okbuf[0] == '?') {
        printf("Enter 'y', 'Y', 'yes' or 'YES' if you agree with the previous asked question.\n");
        printf("All other input will be handled as if the question has beed answered with 'no'.\n");
        goto again;
    }
    if(streql(okbuf, "y") || streql(okbuf, "yes") ||
       streql(okbuf, "Y") || streql(okbuf, "YES"))
        return(TRUE);
    else
        return(FALSE);
}