Peterino2
79dd39e36a
Added support for C printf/scanf format attribute macros and variadic argument
lists, unlocking 2 more perfect APIs.
## Features Added
### 1. Format Attribute Macro Stripping
Strips compiler attribute macros from function declarations:
- `SDL_PRINTF_FORMAT_STRING`
- `SDL_WPRINTF_FORMAT_STRING`
- `SDL_SCANF_FORMAT_STRING`
- `SDL_PRINTF_VARARG_FUNC(N)`
- `SDL_PRINTF_VARARG_FUNCV(N)`
- `SDL_WPRINTF_VARARG_FUNC(N)`
- `SDL_SCANF_VARARG_FUNC(N)`
**Before** (C):
```c
extern SDL_DECLSPEC bool SDLCALL SDL_SetError(
SDL_PRINTF_FORMAT_STRING const char *fmt, ...
) SDL_PRINTF_VARARG_FUNC(1);
```
**After** (Zig):
```zig
pub inline fn setError(fmt: [*c]const u8, ...) bool {
return c.SDL_SetError(fmt, ...);
}
```
### 2. Variadic Arguments Support
Added `va_list` type conversion:
- C type: `va_list`
- Zig type: `std.builtin.VaList`
**Implementation**: Added `const std = @import("std");` to generated headers
to make `std.builtin.VaList` available.
### 3. Double Void Pointer Support
Added conversion for `void **`:
- C type: `void **userdata`
- Zig type: `userdata: [*c]?*anyopaque`
## Implementation Details
### Macro Stripping Algorithm (patterns.zig)
1. **Format String Macros**: Scan function text for format macros
- Pattern: `SDL_PRINTF_FORMAT_STRING const char *fmt`
- Remove macro, keep type: `const char *fmt`
- Handle: PRINTF, WPRINTF, SCANF variants
2. **Vararg Function Macros**: Find and remove end-of-declaration macros
- Pattern: `) SDL_PRINTF_VARARG_FUNC(1);`
- Locate macro position
- Find closing `)` and remove from macro to `)`
- Handle: PRINTF, WPRINTF, SCANF, FUNCV variants
3. **Safe String Manipulation**:
- Create new string with `std.fmt.allocPrint`
- Clear and repopulate ArrayList (avoids aliasing)
- Defer cleanup of temporary strings
### Type Conversions (types.zig)
```zig
// Variadic lists
"va_list" → "std.builtin.VaList"
// Double void pointers
"void **" → "[*c]?*anyopaque"
```
### Header Generation (codegen.zig)
Added std import to all generated files:
```zig
const std = @import("std");
pub const c = @import("c.zig").c;
```
## Results
### Before
- 22/43 APIs perfect (51%)
- Format macros: NOT STRIPPED
- va_list: NOT SUPPORTED
- void **: PARTIALLY SUPPORTED
### After
- **24/43 APIs perfect (56%)** ✅
- Format macros: FULLY STRIPPED
- va_list: FULLY SUPPORTED
- void **: FULLY SUPPORTED
**Progress: +5% (+2 APIs)**
### New Perfect APIs
✅ **SDL_error.h** (24 lines)
- Error handling API
- `SDL_SetError()` uses printf-style formatting
- Had 1 error: format macros + va_list
- Now perfect!
✅ **SDL_log.h** (148 lines)
- Logging system with priority levels
- Multiple printf-style log functions
- Custom log output callbacks
- Had 1 error: format macros + void**
- Now perfect!
## Testing
Tested against all 43 SDL3 headers:
- **24 compile perfectly** (56%) ✅
- 19 have 1-13 errors
- 0 complete failures
**Cumulative Progress**:
- Session start: 15 APIs (35%)
- After function pointers: 19 APIs (44%)
- After arrays/comments: 22 APIs (51%)
- After format macros: **24 APIs (56%)** 🎉
**More than HALF of SDL3 APIs generate perfectly!**
## Impact
**Immediate**: +2 perfect APIs (5% improvement)
**Unlocked**: Printf-style functions now work everywhere
**Fixed**: Variadic argument handling
## Code Changes
### src/patterns.zig (+60 lines)
- `scanFunction()`: Strip format and vararg macros
- Safe string manipulation with allocPrint
- Handles all format macro variants
### src/types.zig (+2 lines)
- Added `va_list` → `std.builtin.VaList` conversion
- Added `void **` → `[*c]?*anyopaque` conversion
### src/codegen.zig (+2 lines)
- Added `const std = @import("std");` to generated headers
- Updated test expectations
## Known Limitations
Function pointer fields in structs not yet supported:
```c
Sint64 (SDLCALL *size)(void *userdata); // Struct field
```
This affects:
- SDL_iostream.h (IOStreamInterface)
- SDL_storage.h (StorageInterface)
- SDL_dialog.h (DialogFileFilter callback)
Will be addressed in future commits.
---
Printf-style functions now work perfectly across SDL3!
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|---|---|---|
| .. | ||
| SDL | ||
| content | ||
| parser | ||
| research | ||
| shaderTypes | ||
| shadercross | ||
| spvreflect | ||
| src | ||
| v2 | ||
| MOCK_TESTING_COMPLETE.md | ||
| apigen.py | ||
| build.zig | ||
| build.zig.zon | ||
| buildshaders.py | ||
| test.json | ||
| test.msl | ||