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121 lines
3.3 KiB
C
121 lines
3.3 KiB
C
/* Functions to convert RAD50 to or from ASCII. */
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/*
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Copyright (c) 2001, Richard Krehbiel
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are
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met:
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o Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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o Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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o Neither the name of the copyright holder nor the names of its
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contributors may be used to endorse or promote products derived from
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this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
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TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
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USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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DAMAGE.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include "rad50.h"
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static char radtbl[] = " ABCDEFGHIJKLMNOPQRSTUVWXYZ$. 0123456789";
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/* rad50 converts from 0 to 3 ASCII (or EBCDIC, if your compiler is so
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inclined) characters into a RAD50 word. */
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unsigned rad50(
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char *cp,
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char **endp)
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{
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unsigned long acc = 0;
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char *rp;
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if (endp)
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*endp = cp;
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if (!*cp) /* Got to check for end-of-string manually, because strchr will call it a hit. :-/ */
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return acc;
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rp = strchr(radtbl, toupper(*cp));
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if (rp == NULL) /* Not a RAD50 character */
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return acc;
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acc = ((int) (rp - radtbl)) * 03100; /* Convert */
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cp++;
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/* Now, do the same thing two more times... */
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if (endp)
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*endp = cp;
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if (!*cp)
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return acc;
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rp = strchr(radtbl, toupper(*cp));
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if (rp == NULL)
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return acc;
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acc += ((int) (rp - radtbl)) * 050;
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cp++;
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if (endp)
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*endp = cp;
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if (!*cp)
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return acc;
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rp = strchr(radtbl, toupper(*cp));
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if (rp == NULL)
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return acc;
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acc += (int) (rp - radtbl);
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cp++;
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if (endp)
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*endp = cp;
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return acc; /* Done. */
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}
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/* rad50x2 - converts from 0 to 6 characters into two words of RAD50. */
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void rad50x2(
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char *cp,
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unsigned *rp)
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{
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*rp++ = rad50(cp, &cp);
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*rp = 0;
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if (*cp)
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*rp = rad50(cp, &cp);
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}
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/* unrad50 - converts a RAD50 word to three characters of ASCII. */
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void unrad50(
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unsigned word,
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char *cp)
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{
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if (word < 0175000) { /* Is it legal RAD50? */
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cp[0] = radtbl[word / 03100];
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cp[1] = radtbl[(word / 050) % 050];
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cp[2] = radtbl[word % 050];
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} else
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cp[0] = cp[1] = cp[2] = ' ';
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}
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