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rwarn.c
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1994-05-05
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/*****************************************************************************
MODULE: rwarn.c
PURPOSE: recio warning functions
COPYRIGHT: (C) 1994 William Pierpoint
COMPILER: Borland C Version 3.1
OS: MSDOS Version 6.2
VERSION: 2.02
RELEASE: May 5, 1994
*****************************************************************************/
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "recio.h"
#define rflags(rp) ((rp)->r_flags)
static void (*_r_warnfn)(REC *) = NULL; /* ptr to warning function */
/****************************************************************************/
void /* returns nothing */
rclearwarn( /* clears warning indicator */
REC *rp) /* record pointer */
/****************************************************************************/
{
if (risvalid(rp)) {
rflags(rp) &= ~(_R_WRN * _R_WRNMAX);
} else {
rseterr(NULL, EINVAL);
}
}
/****************************************************************************/
void /* returns nothing */
rsetwarnfn( /* registers a callback warning function */
void(*rwarnfn)(REC *rp)) /* pointer to warning function */
/****************************************************************************/
{
_r_warnfn = rwarnfn; /* point to callback warning function */
}
/****************************************************************************/
int /* returns warning number (0=no warning */
rwarning( /* gets warning number for record stream */
REC *rp) /* record pointer */
/****************************************************************************/
{
int warnum=0; /* return warning number */
if (risvalid(rp)) {
warnum = rflags(rp) / _R_WRN;
warnum &= _R_WRNMAX;
}
return (warnum);
}
/****************************************************************************/
int /* returns possibly modified warning number */
rsetwarn( /* sets warning number and calls warning fn */
REC *rp, /* record pointer */
int warnum) /* warning number */
/****************************************************************************/
{
/* if valid record pointer */
if (risvalid(rp) && warnum <= _R_WRNMAX) {
/* set warning number on stream */
rflags(rp) &= ~(_R_WRN * _R_WRNMAX);
rflags(rp) |= _R_WRN * warnum;
/* invoke callback warning function */
if (_r_warnfn) _r_warnfn(rp);
/* find out if warnfn() changed warning */
warnum = rwarning(rp);
} else {
rseterr(rp, R_EINVAL);
}
return (warnum);
}
/****************************************************************************/
char * /* returns warning message */
rstrwarning( /* gets warning message for rwarning number */
int warnum) /* warning number */
/****************************************************************************/
{
switch (warnum) {
case 0: return ("no warning");
case R_WEMPSTR: return ("empty data string");
case R_WNOREG: return ("unable to register function with atexit()");
case R_WWIDTH: return ("data too wide for columnar output");
}
return ("unknown warning");
}
/****************************************************************************/
char * /* returns warning message */
rwarnstr( /* gets warning message for record stream */
REC *rp) /* record pointer */
/****************************************************************************/
{
return (risvalid(rp) ? rstrwarning(rwarning(rp)) : rstrerror(R_EINVAL));
}