51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
/* paramvalue() - decode kernel parameter values Author: Kees J. Bot
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* 7 May 1994
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* The kernel returns the results of parameter queries
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* by the XXQUERYPARAM svrctl calls as an array of hex digits, like this:
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* "75020000,080C0000". These are the values of two four-byte variables.
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* Paramvalue() decodes such a string.
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*/
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#define nil 0
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#include <stddef.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/types.h>
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#include <minix/queryparam.h>
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size_t paramvalue(char **value, void *address, size_t size)
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/* Decode the string *value storing the result in the object at address with
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* the given size. *value is left at the next parameter, *address is padded
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* with zeros if needed, and the actual size of the value is returned.
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*/
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{
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unsigned char *addr= address;
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char *v= *value;
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int nibble;
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size_t n;
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n= 0;
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while (*v != 0 && *v != ',') {
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nibble= *v++ - '0';
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if (nibble > 0x9) nibble= nibble + '0' - 'A' + 0xA;
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if (nibble > 0xF) nibble= nibble + 'A' - 'a';
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if (size > 0) {
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if (n % 2 == 0) {
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*addr= nibble << 4;
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} else {
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*addr++|= nibble;
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size--;
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}
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n++;
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}
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}
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while (size > 0) { *addr++= 0; size--; }
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while (*v != 0 && *v++ != ',') {}
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*value= v;
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return n / 2;
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}
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/*
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* $PchId: paramvalue.c,v 1.3 1996/02/22 09:15:56 philip Exp $
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*/
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