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#include "output.h"
#include "printf.h"
#include <util/generic/scope.h>
#include <util/memory/tempbuf.h>
#include <util/generic/yexception.h>
size_t Printf(IOutputStream& out, const char* fmt, ...) {
va_list lst;
va_start(lst, fmt);
Y_DEFER {
va_end(lst);
};
return Printf(out, fmt, lst);
}
static inline size_t TryPrintf(void* ptr, size_t len, IOutputStream& out, const char* fmt, va_list params) {
va_list lst;
va_copy(lst, params);
const int ret = vsnprintf((char*)ptr, len, fmt, lst);
va_end(lst);
if (ret < 0) {
return len;
}
if ((size_t)ret < len) {
out.Write(ptr, (size_t)ret);
}
return (size_t)ret;
}
size_t Printf(IOutputStream& out, const char* fmt, va_list params) {
size_t guess = 0;
while (true) {
TTempBuf tmp(guess);
const size_t ret = TryPrintf(tmp.Data(), tmp.Size(), out, fmt, params);
if (ret < tmp.Size()) {
return ret;
}
guess = Max(tmp.Size() * 2, ret + 1);
}
return 0;
}
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