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public: add Q_strcmp_constant_time

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This commit is contained in:
Alibek Omarov
2026-05-17 11:23:08 +05:00
parent fe2019ee06
commit dbe1a2742e
2 changed files with 16 additions and 0 deletions
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15
public/crtlib.c
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@@ -261,6 +261,21 @@ qboolean Q_stricmpext( const char *pattern, const char *text )
return Q_strnicmpext( pattern, text, ~((size_t)0) );
}
int Q_strcmp_constant_time( const char *s1, const char *s2 )
{
if( !s1 || !s2 )
return ( s1 ? 1 : 0 ) - ( s2 ? 1 : 0 );
size_t l1 = strlen( s1 );
size_t l2 = strlen( s2 );
size_t diff = l1 ^ l2;
for( size_t i = 0; i < l1 && i < l2; i++ )
diff |= s1[i] ^ s2[i];
return diff != 0;
}
const byte *Q_memmem( const byte *haystack, size_t haystacklen, const byte *needle, size_t needlelen )
{
const byte *i;

1
public/crtlib.h
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@@ -92,6 +92,7 @@ static inline int Q_buildnum_compat( void )
//
// crtlib.c
//
int Q_strcmp_constant_time( const char *s1, const char *s2 );
void Q_strnlwr( const char *in, char *out, size_t size_out );
#define Q_strlen( str ) (( str ) ? strlen(( str )) : 0 )
int Q_atoi_hex( int sign, const char *str );