stdarg.h

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typedef __builtin_va_list __gnuc_va_list;
typedef __gnuc_va_list va_list;
#define va_start(v, l)  __builtin_va_start(v, l)
#define va_end(v)       __builtin_va_end(v)
#define va_arg(l, t)    __builtin_va_arg(l, t)

extern int vprintf(const char *format, va_list ap);
extern int vfprintf(FILE *stream, const char *format, va_list ap);
extern int vsprintf(char *str, const char *format, va_list ap);
extern int vsnprintf(char *str, size_t size, const char *format, va_list ap);