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Convert binary search to a C style impl

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doylet
2026-07-05 23:26:54 +10:00
parent ed1f4fc0cc
commit 234fd9e302
5 changed files with 692 additions and 668 deletions
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Source/dn.h
+71 -128
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@@ -1540,7 +1540,42 @@ struct DN_Profiler
DN_F64 frame_avg_tsc;
};
typedef bool (DN_QSortCompareFunc)(void const *a, void const *b, void *user_context);
typedef bool (DN_QSortCompareFunc) (void const *lhs, void const *rhs, void *user_context);
typedef bool (DN_BSearchLessThanFunc)(void const *lhs, void const *rhs, void *user_context);
enum DN_BSearchType
{
// NOTE: Index of the match. If no match is found, found is set to false and the
// index is set to the index where the match should be inserted/exist, if
// it were in the array
DN_BSearchType_Match,
// NOTE: Index of the first element in the array that is `element >= find`. If no such
// item is found or the array is empty, then, the index is set to the array
// size and found is set to `false`.
//
// For example:
// int array[] = {0, 1, 2, 3, 4, 5};
// DN_BSearchResult result = DN_BinarySearch(array, DN_ArrayCountU(array), 4, DN_BSearchType_LowerBound);
// printf("%zu\n", result.index); // Prints index '4'
DN_BSearchType_LowerBound,
// NOTE: Index of the first element in the array that is `element > find`. If no such
// item is found or the array is empty, then, the index is set to the array
// size and found is set to `false`.
//
// For example:
// int array[] = {0, 1, 2, 3, 4, 5};
// DN_BSearchResult result = DN_BinarySearch(array, DN_ArrayCountU(array), 4, DN_BSearchType_UpperBound);
// printf("%zu\n", result.index); // Prints index '5'
DN_BSearchType_UpperBound,
};
struct DN_BSearchResult
{
bool found;
DN_USize index;
};
enum DN_ErrSinkMode
{
DN_ErrSinkMode_Nil, // Default behaviour to accumulate errors into the sink
@@ -3023,22 +3058,22 @@ DN_API DN_USize DN_USizeCodepointCountFromUTF8
DN_API DN_U8 DN_U8FromHexNibble (char hex);
DN_API DN_NibbleFromU8Result DN_NibbleFromU8 (DN_U8 u8);
DN_API DN_USize DN_BytesFromHex (DN_Str8 hex, void *dest, DN_USize dest_count);
DN_API DN_Str8 DN_BytesFromHexArena (DN_Str8 hex, DN_Arena *arena);
DN_API DN_USize DN_BytesFromHexPtr (char const *hex, DN_USize hex_count, void *dest, DN_USize dest_count);
DN_API DN_Str8 DN_BytesFromHexPtrArena (char const *hex, DN_USize hex_count, DN_Arena *arena);
DN_API DN_Str8 DN_BytesFromHexPtrPool (char const *hex, DN_USize hex_count, DN_Pool *pool);
DN_API DN_U8x16 DN_BytesFromHex32Ptr (char const *hex, DN_USize hex_count);
DN_API DN_U8x32 DN_BytesFromHex64Ptr (char const *hex, DN_USize hex_count);
DN_API DN_USize DN_PtrBytesFromStr8Hex (DN_Str8 hex, void *dest, DN_USize dest_count);
DN_API DN_USize DN_PtrBytesFromPtrHex (char const *hex, DN_USize hex_count, void *dest, DN_USize dest_count);
DN_API DN_Str8 DN_Str8BytesFromStr8HexArena (DN_Str8 hex, DN_Arena *arena);
DN_API DN_Str8 DN_Str8BytesFromPtrHexArena (char const *hex, DN_USize hex_count, DN_Arena *arena);
DN_API DN_Str8 DN_Str8BytesFromPtrHexPool (char const *hex, DN_USize hex_count, DN_Pool *pool);
DN_API DN_U8x16 DN_U8x16FromPtrHex32 (char const *hex, DN_USize hex_count);
DN_API DN_U8x32 DN_U8x32FromPtrHex64 (char const *hex, DN_USize hex_count);
DN_API DN_HexU64 DN_HexFromU64 (DN_U64 value, DN_HexFromU64Type type);
DN_API DN_USize DN_HexFromPtrBytes (void const *bytes, DN_USize bytes_count, void *hex, DN_USize hex_count, DN_TrimLeadingZero trim_leading_z);
DN_API DN_Str8 DN_HexFromPtrBytesArena (void const *bytes, DN_USize bytes_count, DN_Arena *arena, DN_TrimLeadingZero trim_leading_z);
DN_API DN_USize DN_HexFromStr8Bytes (DN_Str8 bytes, void *hex, DN_USize hex_count, DN_TrimLeadingZero trim_leading_z);
DN_API DN_Str8 DN_HexFromStr8BytesArena (DN_Str8 bytes, DN_Arena *arena, DN_TrimLeadingZero trim_leading_z);
DN_API DN_Hex32 DN_Hex32FromPtr16b (void const *bytes, DN_USize bytes_count, DN_TrimLeadingZero trim_leading_z);
DN_API DN_Hex64 DN_Hex64FromPtr32b (void const *bytes, DN_USize bytes_count, DN_TrimLeadingZero trim_leading_z);
DN_API DN_Hex128 DN_Hex128FromPtr64b (void const *bytes, DN_USize bytes_count, DN_TrimLeadingZero trim_leading_z);
DN_API DN_HexU64 DN_HexU64FromU64 (DN_U64 value, DN_HexFromU64Type type);
DN_API DN_USize DN_PtrHexFromPtrBytes (void const *bytes, DN_USize bytes_count, void *hex, DN_USize hex_count, DN_TrimLeadingZero trim_leading_z);
DN_API DN_USize DN_PtrHexFromStr8Bytes (DN_Str8 bytes, void *hex, DN_USize hex_count, DN_TrimLeadingZero trim_leading_z);
DN_API DN_Str8 DN_Str8HexFromPtrBytesArena (void const *bytes, DN_USize bytes_count, DN_Arena *arena, DN_TrimLeadingZero trim_leading_z);
DN_API DN_Str8 DN_Str8HexFromStr8BytesArena (DN_Str8 bytes, DN_Arena *arena, DN_TrimLeadingZero trim_leading_z);
DN_API DN_Hex32 DN_Hex32FromPtrBytes16 (void const *bytes, DN_USize bytes_count, DN_TrimLeadingZero trim_leading_z);
DN_API DN_Hex64 DN_Hex64FromPtrBytes32 (void const *bytes, DN_USize bytes_count, DN_TrimLeadingZero trim_leading_z);
DN_API DN_Hex128 DN_Hex128FromPtrBytes64 (void const *bytes, DN_USize bytes_count, DN_TrimLeadingZero trim_leading_z);
DN_API DN_Str8x128 DN_AgeStr8FromMsU64 (DN_U64 duration_ms, DN_AgeUnit units);
DN_API DN_Str8x128 DN_AgeStr8FromSecU64 (DN_U64 duration_ms, DN_AgeUnit units);
@@ -3130,6 +3165,13 @@ DN_API void DN_QSortStr8NaturalDesc
DN_API void DN_QSortStr8LexicographicAsc (DN_Str8 *array, DN_USize array_size, DN_Str8EqCase eq_case);
DN_API void DN_QSortStr8LexicographicDesc (DN_Str8 *array, DN_USize array_size, DN_Str8EqCase eq_case);
DN_API bool DN_BSearchLessThanBytes (void const *lhs, void const *rhs, void *user_context);
DN_API DN_BSearchResult DN_BSearch (void const *array, DN_USize count, DN_USize elem_size, void const *find, DN_BSearchType type, void *user_context, DN_BSearchLessThanFunc *less_than);
DN_API DN_BSearchResult DN_BSearchBytes (void const *array, DN_USize count, DN_USize elem_size, void const *find, DN_BSearchType type);
DN_API DN_BSearchResult DN_BSearchUSize (DN_USize const *array, DN_USize count, DN_USize find, DN_BSearchType type);
DN_API DN_BSearchResult DN_BSearchU64 (DN_U64 const *array, DN_USize count, DN_U64 find, DN_BSearchType type);
DN_API DN_BSearchResult DN_BSearchU32 (DN_U32 const *array, DN_USize count, DN_U32 find, DN_BSearchType type);
DN_API DN_PCG32 DN_PCG32Init (DN_U64 seed);
DN_API DN_U32 DN_PCG32Next (DN_PCG32 *rng);
DN_API DN_U64 DN_PCG32Next64 (DN_PCG32 *rng);
@@ -4143,6 +4185,7 @@ DN_API void DN_TestGroupEnd
DN_API void DN_TestBeginF (DN_TestCore *test, char const *fmt, ...);
DN_API void DN_TestEnd (DN_TestCore *test);
#define DN_TestScopeF(test_ptr, fmt, ...) bool test_once_ = (DN_TestBeginF(test_ptr, fmt, ##__VA_ARGS__), false); !test_once_; DN_TestEnd(test_ptr), test_once_ = true
DN_API DN_Str8 DN_Str8FromTestCore (DN_TestCore const *test, DN_Arena *arena, DN_Str8FromTestCoreFlags flags);
DN_API void DN_TestVerifyExprF_ (DN_TestCore *test, DN_CallSite call_site, DN_Str8 expr, bool expr_result, char const *fmt, ...);
#define DN_TestVerifyExprF(test_ptr, expr, fmt, ...) DN_TestVerifyExprF_(test_ptr, DN_CallSiteNow, DN_Str8Lit(#expr), (expr), fmt, ##__VA_ARGS__)
@@ -4202,128 +4245,28 @@ DN_API void DN_TestVerifyBytesF
#define DN_TestVerifyBytesNotEqF(test_ptr, bytes, expect, fmt, ...) DN_TestVerifyBytesF(test_ptr, DN_CallSiteNow, DN_Str8Lit(#bytes " != " #expect), (bytes), (expect), /*expect_eq=*/ false, fmt, ##__VA_ARGS__)
#define DN_TestVerifyBytesNotEq(test_ptr, bytes, expect) DN_TestVerifyBytesF(test_ptr, DN_CallSiteNow, DN_Str8Lit(#bytes " != " #expect), (bytes), (expect), /*expect_eq=*/ false, "")
DN_API DN_Str8 DN_Str8FromTestCore (DN_TestCore const *test, DN_Arena *arena, DN_Str8FromTestCoreFlags flags);
#if DN_WITH_TESTS
DN_API DN_TestCore DN_TestSuite (DN_Arena *arena_);
#endif
// TODO: Replace with a C implementation
template <typename T>
using DN_BinarySearchLessThanProc = bool(T const &lhs, T const &rhs);
template <typename T>
bool DN_BinarySearch_DefaultLessThan(T const &lhs, T const &rhs);
enum DN_BinarySearchType
{
// Index of the match. If no match is found, found is set to false and the
// index is set to the index where the match should be inserted/exist, if
// it were in the array
DN_BinarySearchType_Match,
// Index of the first element in the array that is `element >= find`. If no such
// item is found or the array is empty, then, the index is set to the array
// size and found is set to `false`.
//
// For example:
// int array[] = {0, 1, 2, 3, 4, 5};
// DN_BinarySearchResult result = DN_BinarySearch(array, DN_ArrayCountU(array), 4, DN_BinarySearchType_LowerBound);
// printf("%zu\n", result.index); // Prints index '4'
DN_BinarySearchType_LowerBound,
// Index of the first element in the array that is `element > find`. If no such
// item is found or the array is empty, then, the index is set to the array
// size and found is set to `false`.
//
// For example:
// int array[] = {0, 1, 2, 3, 4, 5};
// DN_BinarySearchResult result = DN_BinarySearch(array, DN_ArrayCountU(array), 4, DN_BinarySearchType_UpperBound);
// printf("%zu\n", result.index); // Prints index '5'
DN_BinarySearchType_UpperBound,
};
struct DN_BinarySearchResult
{
bool found;
DN_USize index;
};
template <typename T> bool DN_BinarySearch_DefaultLessThan(T const &lhs, T const &rhs);
template <typename T> DN_BinarySearchResult DN_BinarySearch (T const *array, DN_USize array_size, T const &find, DN_BinarySearchType type = DN_BinarySearchType_Match, DN_BinarySearchLessThanProc<T> less_than = DN_BinarySearch_DefaultLessThan);
template <typename T>
bool DN_BinarySearch_DefaultLessThan(T const &lhs, T const &rhs)
{
bool result = lhs < rhs;
return result;
}
template <typename T>
DN_BinarySearchResult DN_BinarySearch(T const *array,
DN_USize array_size,
T const &find,
DN_BinarySearchType type,
DN_BinarySearchLessThanProc<T> less_than)
{
DN_BinarySearchResult result = {};
if (!array || array_size <= 0 || !less_than)
return result;
T const *end = array + array_size;
T const *first = array;
T const *last = end;
while (first != last) {
DN_USize count = last - first;
T const *it = first + (count / 2);
bool advance_first = false;
if (type == DN_BinarySearchType_UpperBound)
advance_first = !less_than(find, it[0]);
else
advance_first = less_than(it[0], find);
if (advance_first)
first = it + 1;
else
last = it;
}
switch (type) {
case DN_BinarySearchType_Match: {
result.found = first != end && !less_than(find, *first);
} break;
case DN_BinarySearchType_LowerBound: /*FALLTHRU*/
case DN_BinarySearchType_UpperBound: {
result.found = first != end;
} break;
}
result.index = first - array;
return result;
}
DN_API void DN_LeakTrackAlloc_ (DN_LeakTracker *leak, void *ptr, DN_USize size, bool alloc_can_leak);
DN_API void DN_LeakTrackDealloc_(DN_LeakTracker *leak, void *ptr);
DN_API void DN_LeakDump_ (DN_LeakTracker *leak);
DN_API void DN_LeakTrackAlloc_ (DN_LeakTracker *leak, void *ptr, DN_USize size, bool alloc_can_leak);
DN_API void DN_LeakTrackDealloc_ (DN_LeakTracker *leak, void *ptr);
DN_API void DN_LeakDump_ (DN_LeakTracker *leak);
#if defined(DN_LEAK_TRACKING)
#define DN_LeakTrackAlloc(leak, ptr, size, alloc_can_leak) DN_LeakTrackAlloc_(leak, ptr, size, alloc_can_leak)
#define DN_LeakTrackDealloc(leak, ptr) DN_LeakTrackDealloc_(leak, ptr)
#define DN_LeakDump(leak) DN_LeakDump_(leak)
#define DN_LeakTrackAlloc(leak, ptr, size, alloc_can_leak) DN_LeakTrackAlloc_(leak, ptr, size, alloc_can_leak)
#define DN_LeakTrackDealloc(leak, ptr) DN_LeakTrackDealloc_(leak, ptr)
#define DN_LeakDump(leak) DN_LeakDump_(leak)
#else
#define DN_LeakTrackAlloc(leak, ptr, size, alloc_can_leak) do { (void)ptr; (void)size; (void)alloc_can_leak; } while (0)
#define DN_LeakTrackDealloc(leak, ptr) do { (void)ptr; } while (0)
#define DN_LeakDump(leak) do { } while (0)
#define DN_LeakTrackAlloc(leak, ptr, size, alloc_can_leak) do { (void)ptr; (void)size; (void)alloc_can_leak; } while (0)
#define DN_LeakTrackDealloc(leak, ptr) do { (void)ptr; } while (0)
#define DN_LeakDump(leak) do { } while (0)
#endif
#if DN_WITH_OS
DN_API DN_Str8 DN_OS_Str8FromStr8BuilderHeap (DN_Str8Builder const *builder);
DN_API void DN_OS_LogPrint (DN_LogTypeParam type, void *user_data, DN_CallSite call_site, DN_FMT_ATTRIB char const *fmt, va_list args);
DN_API void DN_OS_SetLogPrintFuncToOS ();
DN_API DN_Str8 DN_OS_Str8FromStr8BuilderHeap (DN_Str8Builder const *builder);
DN_API void DN_OS_LogPrint (DN_LogTypeParam type, void *user_data, DN_CallSite call_site, DN_FMT_ATTRIB char const *fmt, va_list args);
DN_API void DN_OS_SetLogPrintFuncToOS ();
// NOTE: Heap
// Overview