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/**
* @ingroup shm
* @ingroup lxrt
* @ingroup tasklets
* @file
*
* Conversion between characters strings and unsigned long identifiers.
*
* Convert a 6 characters string to un unsigned long, and vice versa, to be used
* as an identifier for RTAI services symmetrically available in user and kernel
* space, e.g. @ref shm "shared memory" and @ref lxrt "LXRT and LXRT-INFORMED".
*
* @author Paolo Mantegazza
*
* @note Copyright © 1999-2003 Paolo Mantegazza <mantegazza@aero.polimi.it>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#ifndef _RTAI_NAM2NUM_H
#define _RTAI_NAM2NUM_H
#include <rtai_types.h>
/**
* Convert a 6 characters string to an unsigned long.
*
* Converts a 6 characters string name containing an alpha numeric
* identifier to its corresponding unsigned long identifier.
*
* @param name is the name to be converted.
*
* Allowed characters are:
* - english letters (no difference between upper and lower case);
* - decimal digits;
* - underscore (_) and another character of your choice. The latter will be
* always converted back to a $ by num2nam().
*
* @return the unsigned long associated with @a name.
*/
static inline unsigned long nam2num (const char *name)
{
unsigned long retval = 0;
int c, i;
for (i = 0; i < 6; i++) {
if (!(c = name[i]))
break;
if (c >= 'a' && c <= 'z') {
c += (11 - 'a');
} else if (c >= 'A' && c <= 'Z') {
c += (11 - 'A');
} else if (c >= '0' && c <= '9') {
c -= ('0' - 1);
} else {
c = c == '_' ? 37 : 38;
}
retval = retval*39 + c;
}
if (i > 0)
return retval;
else
return 0xFFFFFFFF;
}
/**
* Convert an unsigned long to a 6 characters string.
*
* @param num is the unsigned long identifier whose alphanumeric name string has
* to be evaluated;
*
* @param name is a pointer to a 6 characters buffer where the identifier will
* be returned.
*/
static inline void num2nam (unsigned long num, char *name)
{
int c, i, k, q;
if (num == 0xFFFFFFFF) {
name[0] = 0;
return;
}
i = 5;
while (num && i >= 0) {
q = num/39;
c = num - q*39;
num = q;
if ( c < 37) {
name[i--] = c > 10 ? c + 'A' - 11 : c + '0' - 1;
} else {
name[i--] = c == 37 ? '_' : '$';
}
}
for (k = 0; i < 5; k++) {
name[k] = name[++i];
}
name[k] = 0;
}
#endif /* !_RTAI_NAM2NUM_H */
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