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/**************************************************************************
**
** Copyright (C) 1993 David E. Steward & Zbigniew Leyk, all rights reserved.
**
** Meschach Library
**
** This Meschach Library is provided "as is" without any express
** or implied warranty of any kind with respect to this software.
** In particular the authors shall not be liable for any direct,
** indirect, special, incidental or consequential damages arising
** in any way from use of the software.
**
** Everyone is granted permission to copy, modify and redistribute this
** Meschach Library, provided:
** 1. All copies contain this copyright notice.
** 2. All modified copies shall carry a notice stating who
** made the last modification and the date of such modification.
** 3. No charge is made for this software or works derived from it.
** This clause shall not be construed as constraining other software
** distributed on the same medium as this software, nor is a
** distribution fee considered a charge.
**
***************************************************************************/
/*
File for doing assorted I/O operations not invlolving
MAT/VEC/PERM objects
*/
static char rcsid[] = "$Id: otherio.c,v 1.2 1994/01/13 05:34:52 des Exp $";
#include <stdio.h>
#include <ctype.h>
#include "matrix.h"
/* scratch area -- enough for a single line */
static char scratch[MAXLINE+1];
/* default value for fy_or_n */
static int y_n_dflt = TRUE;
/* fy_or_n -- yes-or-no to question is string s
-- question written to stderr, input from fp
-- if fp is NOT a tty then return y_n_dflt */
int fy_or_n(fp,s)
FILE *fp;
char *s;
{
char *cp;
if ( ! isatty(fileno(fp)) )
return y_n_dflt;
for ( ; ; )
{
fprintf(stderr,"%s (y/n) ? ",s);
if ( fgets(scratch,MAXLINE,fp)==NULL )
error(E_INPUT,"fy_or_n");
cp = scratch;
while ( isspace(*cp) )
cp++;
if ( *cp == 'y' || *cp == 'Y' )
return TRUE;
if ( *cp == 'n' || *cp == 'N' )
return FALSE;
fprintf(stderr,"Please reply with 'y' or 'Y' for yes ");
fprintf(stderr,"and 'n' or 'N' for no.\n");
}
}
/* yn_dflt -- sets the value of y_n_dflt to val */
int yn_dflt(val)
int val;
{ return y_n_dflt = val; }
/* fin_int -- return integer read from file/stream fp
-- prompt s on stderr if fp is a tty
-- check that x lies between low and high: re-prompt if
fp is a tty, error exit otherwise
-- ignore check if low > high */
int fin_int(fp,s,low,high)
FILE *fp;
char *s;
int low, high;
{
int retcode, x;
if ( ! isatty(fileno(fp)) )
{
skipjunk(fp);
if ( (retcode=fscanf(fp,"%d",&x)) == EOF )
error(E_INPUT,"fin_int");
if ( retcode <= 0 )
error(E_FORMAT,"fin_int");
if ( low <= high && ( x < low || x > high ) )
error(E_BOUNDS,"fin_int");
return x;
}
for ( ; ; )
{
fprintf(stderr,"%s: ",s);
if ( fgets(scratch,MAXLINE,stdin)==NULL )
error(E_INPUT,"fin_int");
retcode = sscanf(scratch,"%d",&x);
if ( ( retcode==1 && low > high ) ||
( x >= low && x <= high ) )
return x;
fprintf(stderr,"Please type an integer in range [%d,%d].\n",
low,high);
}
}
/* fin_double -- return double read from file/stream fp
-- prompt s on stderr if fp is a tty
-- check that x lies between low and high: re-prompt if
fp is a tty, error exit otherwise
-- ignore check if low > high */
double fin_double(fp,s,low,high)
FILE *fp;
char *s;
double low, high;
{
Real retcode, x;
if ( ! isatty(fileno(fp)) )
{
skipjunk(fp);
#if REAL == DOUBLE
if ( (retcode=fscanf(fp,"%lf",&x)) == EOF )
#elif REAL == FLOAT
if ( (retcode=fscanf(fp,"%f",&x)) == EOF )
#endif
error(E_INPUT,"fin_double");
if ( retcode <= 0 )
error(E_FORMAT,"fin_double");
if ( low <= high && ( x < low || x > high ) )
error(E_BOUNDS,"fin_double");
return (double)x;
}
for ( ; ; )
{
fprintf(stderr,"%s: ",s);
if ( fgets(scratch,MAXLINE,stdin)==NULL )
error(E_INPUT,"fin_double");
#if REAL == DOUBLE
retcode = sscanf(scratch,"%lf",&x);
#elif REAL == FLOAT
retcode = sscanf(scratch,"%f",&x);
#endif
if ( ( retcode==1 && low > high ) ||
( x >= low && x <= high ) )
return (double)x;
fprintf(stderr,"Please type an double in range [%g,%g].\n",
low,high);
}
}
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