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valid.c
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valid.c
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#include <stdio.h>
#include "cachestruct.h"
char validReplaceAlg(char *);
char validWritePolicy(char *);
/*checks to see if inputs are valid, and then stores cache parameters into currsim)*/
int validArgs(char *cachesize,char *associativity,char *blocksize,char *replacealg,char *writepolicy,Cache *currsim) {
int cacheSize = 0;
int setSize = 0;
int blockSize = 0;
int numSets = 0;
char replaceAlg;
char writePolicy;
cacheSize = validCacheSize(cachesize);
if(!cacheSize)
return 0;
currsim->cacheSize = cacheSize;
setSize = validAssociativity(associativity);
if(!setSize)
return 0;
currsim->setSize = setSize;
blockSize = validBlockSize(blocksize);
if(!blockSize)
return 0;
currsim->blockSize = blockSize;
numSets = cacheSize/(setSize*blockSize);
if(numSets == 0)
return 0;
currsim->numSets = numSets;
replaceAlg = validReplaceAlg(replacealg);
if(replaceAlg = '\0')
return 0;
currsim->replaceAlg = replaceAlg;
writePolicy = validWritePolicy(writepolicy);
if(writePolicy == '\0')
return 0;
currsim->writePolicy = writePolicy;
return 1;
}
int validCacheSize(char *cachesize) {
int cacheSize;
int numScanned = sscanf(cachesize,"%d",&cacheSize);
if(numScanned = 0)
return 0;
if(isPow2(cacheSize))
return cacheSize;
return 0;
}
int validAssociativity(char *assoc) {
int setSize;
if(strcmp(assoc,"-direct") == 0)
setSize = 1;
else if(strncmp(assoc,"-assoc:",7) == 0) {
setSize = strtol(assoc,assoc+7,10);
if(!isPow2(setSize))
setSize = 0;
}
return setSize;
}
int validBlockSize(char *blocksize) {
int blockSize;
int numScanned = sscanf(blocksize,"%d",&blockSize);
if(numScanned == 0)
return 0;
if(isPow2(blockSize))
return blockSize;
return 0;
}
char validReplaceAlg(char *replacealg) {
char replaceAlg;
if(strcmp(replacealg,"-LRU") == 0)
replaceAlg = 'l';
else if(strcmp(replacealg,"-FIFO") == 0)
replaceAlg = 'f';
return replaceAlg;
}
char validWritePolicy(char *writepolicy) {
char writePolicy;
if(strcmp(writepolicy,"-wt") == 0)
writePolicy = 't';
else if(strcmp(writepolicy,"-wb") == 0)
writePolicy = 'b';
return writePolicy;
}
/*Utility function that checks if a number is a power of 2
* Useful for checking cache size, block size, set size, and number of sets values*/
int isPow2(int x) {
int i;
for(i = 0; i < 31; i++) {
if(x == 1<<i)
return 1;
}
return 0;
}