45 lines
925 B
C
45 lines
925 B
C
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/*
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* Copyright 1987 by MIT Student Information Processing Board
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* For copyright info, see Copyright.SIPB.
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*
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* $Id: et_name.c,v 1.2 1994/07/19 19:21:27 g89r4222 Exp $
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*/
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#include "error_table.h"
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static char copyright[] = "Copyright 1987 by MIT Student Information Processing Board";
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char *malloc();
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char *
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error_table_name(num)
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int num;
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{
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register int ch;
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register int i;
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register char *buf, *p;
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/* num = aa aaa abb bbb bcc ccc cdd ddd d?? ??? ??? */
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buf = malloc(5);
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p = buf;
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num >>= ERRCODE_RANGE;
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/* num = ?? ??? ??? aaa aaa bbb bbb ccc ccc ddd ddd */
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num &= 077777777;
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/* num = 00 000 000 aaa aaa bbb bbb ccc ccc ddd ddd */
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for (i = 0; i < 5; i++) {
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ch = (num >> 24-6*i) & 077;
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if (ch == 0)
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continue;
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else if (ch < 27)
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*p++ = ch - 1 + 'A';
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else if (ch < 53)
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*p++ = ch - 27 + 'a';
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else if (ch < 63)
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*p++ = ch - 53 + '0';
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else /* ch == 63 */
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*p++ = '_';
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}
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return(buf);
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}
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