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Refactor the interface to the randomness generator. (CVS 1224)

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FossilOrigin-Name: f2bdccf4bb2f796aafb64c33e55f62a1794d750c
This commit is contained in:
drh
2004-02-11 09:46:30 +00:00
parent 9eb9e26b82
commit bbd82df617
10 changed files with 73 additions and 80 deletions
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18
src/func.c
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@@ -16,7 +16,7 @@
** sqliteRegisterBuildinFunctions() found at the bottom of the file.
** All other code has file scope.
**
** $Id: func.c,v 1.38 2004/01/30 14:49:17 drh Exp $
** $Id: func.c,v 1.39 2004/02/11 09:46:32 drh Exp $
*/
#include <ctype.h>
#include <math.h>
@@ -195,7 +195,9 @@ static void ifnullFunc(sqlite_func *context, int argc, const char **argv){
** Implementation of random(). Return a random integer.
*/
static void randomFunc(sqlite_func *context, int argc, const char **argv){
sqlite_set_result_int(context, sqliteRandomInteger());
int r;
sqliteRandomness(sizeof(r), &r);
sqlite_set_result_int(context, r);
}
/*
@@ -341,13 +343,13 @@ static void soundexFunc(sqlite_func *context, int argc, const char **argv){
** generating test data.
*/
static void randStr(sqlite_func *context, int argc, const char **argv){
static const char zSrc[] =
static const unsigned char zSrc[] =
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"0123456789"
".-!,:*^+=_|?/<> ";
int iMin, iMax, n, r, i;
char zBuf[1000];
unsigned char zBuf[1000];
if( argc>=1 ){
iMin = atoi(argv[0]);
if( iMin<0 ) iMin = 0;
@@ -364,14 +366,14 @@ static void randStr(sqlite_func *context, int argc, const char **argv){
}
n = iMin;
if( iMax>iMin ){
r = sqliteRandomInteger() & 0x7fffffff;
sqliteRandomness(sizeof(r), &r);
r &= 0x7fffffff;
n += r%(iMax + 1 - iMin);
}
assert( n<sizeof(zBuf) );
r = 0;
sqliteRandomness(n, zBuf);
for(i=0; i<n; i++){
r = (r + sqliteRandomByte())% (sizeof(zSrc)-1);
zBuf[i] = zSrc[r];
zBuf[i] = zSrc[zBuf[i]%(sizeof(zSrc)-1)];
}
zBuf[n] = 0;
sqlite_set_result_string(context, zBuf, n);