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Add the randomhex() function as a built-in. (CVS 3619)

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FossilOrigin-Name: a6001589ab1349f7a6b4af941e9e0fd73d13c1c0
This commit is contained in:
drh
2007-01-29 15:50:05 +00:00
parent 5fecee1557
commit 63cf66f02e
5 changed files with 72 additions and 13 deletions
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30
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 1.134 2006/09/16 21:45:14 drh Exp $
** $Id: func.c,v 1.135 2007/01/29 15:50:06 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
@@ -272,6 +272,33 @@ static void randomFunc(
sqlite3_result_int64(context, r);
}
/*
** Implementation of randomhex(N). Return a random hexadecimal string
** that is N characters long.
*/
static void randomHex(
sqlite3_context *context,
int argc,
sqlite3_value **argv
){
int n, i, j;
unsigned char c, zBuf[1001];
assert( argc==1 );
n = sqlite3_value_int(argv[0]);
if( n&1 ) n++;
if( n<2 ) n = 2;
if( n>sizeof(zBuf)-1 ) n = sizeof(zBuf)-1;
sqlite3Randomness(n/2, zBuf);
for(i=n-1, j=n/2-1; i>=1; i-=2, j--){
static const char zDigits[] = "0123456789ABCDEF";
c = zBuf[j];
zBuf[i] = zDigits[c&0xf];
zBuf[i-1] = zDigits[c>>4];
}
zBuf[n] = 0;
sqlite3_result_text(context, (char*)zBuf, n, SQLITE_TRANSIENT);
}
/*
** Implementation of the last_insert_rowid() SQL function. The return
** value is the same as the sqlite3_last_insert_rowid() API function.
@@ -1024,6 +1051,7 @@ void sqlite3RegisterBuiltinFunctions(sqlite3 *db){
{ "coalesce", 1, 0, SQLITE_UTF8, 0, 0 },
{ "ifnull", 2, 0, SQLITE_UTF8, 1, ifnullFunc },
{ "random", -1, 0, SQLITE_UTF8, 0, randomFunc },
{ "randomhex", 1, 0, SQLITE_UTF8, 0, randomHex },
{ "nullif", 2, 0, SQLITE_UTF8, 1, nullifFunc },
{ "sqlite_version", 0, 0, SQLITE_UTF8, 0, versionFunc},
{ "quote", 1, 0, SQLITE_UTF8, 0, quoteFunc },