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/* This file is part of the Project Athena Zephyr Notification System.
* It contains source for the ZReadAscii function.
*
* Created by: Robert French
*
* $Source$
* $Author$
*
* Copyright (c) 1987 by the Massachusetts Institute of Technology.
* For copying and distribution information, see the file
* "mit-copyright.h".
*/
/* $Header$ */
#ifndef lint
static char rcsid_ZReadAscii_c[] = "$Header$";
#endif lint
#include <zephyr/mit-copyright.h>
#include <zephyr/zephyr_internal.h>
int ZReadAscii(ptr, len, field, num)
char *ptr;
int len;
unsigned char *field;
int num;
{
int i;
unsigned int hexbyte;
register char c1, c2;
for (i=0;i<num;i++) {
if (*ptr == ' ') {
ptr++;
if (--len < 0)
return (ZERR_BADFIELD);
}
if (ptr[0] == '0' && ptr[1] == 'x') {
ptr += 2;
len -= 2;
if (len < 0)
return (ZERR_BADFIELD);
}
c1 = cnvt_xtoi(ptr[0]);
c2 = cnvt_xtoi(ptr[1]);
if (c1 < 0 || c2 < 0)
return(ZERR_BADFIELD);
hexbyte = (c1 << 4) | c2;
field[i] = hexbyte;
ptr += 2;
len -= 2;
if (len < 0)
return (ZERR_BADFIELD);
}
if (*ptr)
return (ZERR_BADFIELD);
return (ZERR_NONE);
}
cnvt_xtoi(c)
char c;
{
c -= '0';
if (c < 10)
return (c);
c -= 'A'-'9'-1;
if (c < 16)
return (c);
c -= 'a'-'A';
if (c > 15)
return (-1);
return (c);
}
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