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implement _vswprintf_c_l

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This commit is contained in:
rjkiv 2025-09-03 14:21:33 -07:00
parent 98f1548370
commit 866dd6ddbb
1 changed files with 28 additions and 3 deletions
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31
dll/msvcrt.cpp
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@ -1,5 +1,6 @@
#include "common.h"
#include <clocale>
#include <cstdarg>
#include <cstdint>
#include <cstdlib>
#include <cwchar>
@ -442,11 +443,35 @@ namespace msvcrt {
return wstrncmp(string1, string2, count);
}
int WIN_ENTRY _vswprintf_c_l(uint16_t* buffer, size_t size, const uint16_t* format, va_list args) {
int WIN_ENTRY _vswprintf_c_l(uint16_t* buffer, size_t size, const uint16_t* format, ...) {
DEBUG_LOG("_vswprintf_c_l\n");
if (!buffer || !format || size == 0)
return -1;
DEBUG_LOG("STUB: _vswprintf_c_l\n");
return 0;
std::string narrow_fmt = wideStringToString(format);
DEBUG_LOG("\tFmt: %s\n", narrow_fmt.c_str());
va_list args;
va_start(args, format);
int required = vsnprintf(nullptr, 0, narrow_fmt.c_str(), args);
va_end(args);
if (required < 0) {
buffer[0] = 0;
return -1;
}
char buffer_narrow[required + 1];
va_start(args, format);
vsnprintf(buffer_narrow, required + 1, narrow_fmt.c_str(), args);
va_end(args);
DEBUG_LOG("\tBuffer: %s\n", buffer_narrow);
std::vector<uint16_t> wide = stringToWideString(buffer_narrow);
size_t copy_len = std::min(wide.size(), size - 1);
std::memcpy(buffer, wide.data(), copy_len * sizeof(uint16_t));
buffer[copy_len] = 0;
return copy_len;
// return vswprintf(buffer, size, format, args); this doesn't work because on this architecture, wchar_t is size 4, instead of size 2
}