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Why is vsnprintf Not Writing the Same Number of Characters as strncpy Would?
#include <cstdarg> #include <cstdio> #include <iostream> #include <string> using namespace std; void bar(const char* format, va_list vlist) { const auto buf_size = vsnprintf(nullptr, 0U, format, vlist); string buffer(buf_size, '\0'); vsnprintf(&*begin(buffer), buf_size, format, vlist); cout << buffer.data() << endl; } void foo(const char* format, ...) { va_list vlist; va_start(vlist, format); bar(format, vlist); va_end(vlist); } int main() { foo("lorem ipsum %d", 13); }
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