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Add evidence marks for the abs() and soundex() SQL functions.

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FossilOrigin-Name: 003f3ed10cdb64b73d6df00e28260dd3491e1f16
This commit is contained in:
drh
2009-12-08 02:06:08 +00:00
parent 9286c07daa
commit 2ba3cccf22
3 changed files with 33 additions and 12 deletions
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src/func.c
+23 -2
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@@ -117,7 +117,10 @@ static void lengthFunc(
}
/*
** Implementation of the abs() function
** Implementation of the abs() function.
**
** IMP: R-23979-26855 The abs(X) function returns the absolute value of
** the numeric argument X.
*/
static void absFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
assert( argc==1 );
@@ -127,6 +130,9 @@ static void absFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
i64 iVal = sqlite3_value_int64(argv[0]);
if( iVal<0 ){
if( (iVal<<1)==0 ){
/* IMP: R-35460-15084 If X is the integer -9223372036854775807 then
** abs(X) throws an integer overflow error since there is no
** equivalent positive 64-bit two complement value. */
sqlite3_result_error(context, "integer overflow", -1);
return;
}
@@ -136,10 +142,16 @@ static void absFunc(sqlite3_context *context, int argc, sqlite3_value **argv){
break;
}
case SQLITE_NULL: {
/* IMP: R-37434-19929 Abs(X) returns NULL if X is NULL. */
sqlite3_result_null(context);
break;
}
default: {
/* Because sqlite3_value_double() returns 0.0 if the argument is not
** something that can be converted into a number, we have:
** IMP: R-57326-31541 Abs(X) return 0.0 if X is a string or blob that
** cannot be converted to a numeric value.
*/
double rVal = sqlite3_value_double(argv[0]);
if( rVal<0 ) rVal = -rVal;
sqlite3_result_double(context, rVal);
@@ -1041,9 +1053,16 @@ static void trimFunc(
}
/* IMP: R-25361-16150 This function is omitted from SQLite by default. It
** is only available if the SQLITE_SOUNDEX compile-time option is used
** when SQLite is built.
*/
#ifdef SQLITE_SOUNDEX
/*
** Compute the soundex encoding of a word.
**
** IMP: R-59782-00072 The soundex(X) function returns a string that is the
** soundex encoding of the string X.
*/
static void soundexFunc(
sqlite3_context *context,
@@ -1087,10 +1106,12 @@ static void soundexFunc(
zResult[j] = 0;
sqlite3_result_text(context, zResult, 4, SQLITE_TRANSIENT);
}else{
/* IMP: R-64894-50321 The string "?000" is returned if the argument
** is NULL or contains no ASCII alphabetic characters. */
sqlite3_result_text(context, "?000", 4, SQLITE_STATIC);
}
}
#endif
#endif /* SQLITE_SOUNDEX */
#ifndef SQLITE_OMIT_LOAD_EXTENSION
/*