Function malloc_vsnprintf

deps/jemalloc/src/malloc_io.c:326–363

}

size_t
malloc_vsnprintf(char *str, size_t size, const char *format, va_list ap) {
	size_t i;
	const char *f;

#define APPEND_C(c) do {						\
	if (i < size) {							\
		str[i] = (c);						\
	}								\
	i++;								\
} while (0)
#define APPEND_S(s, slen) do {						\
	if (i < size) {							\
		size_t cpylen = (slen <= size - i) ? slen : size - i;	\
		memcpy(&str[i], s, cpylen);				\
	}								\
	i += slen;							\
} while (0)
#define APPEND_PADDED_S(s, slen, width, left_justify) do {		\
	/* Left padding. */						\
	size_t pad_len = (width == -1) ? 0 : ((slen < (size_t)width) ?	\
	    (size_t)width - slen : 0);					\
	if (!left_justify && pad_len != 0) {				\
		size_t j;						\
		for (j = 0; j < pad_len; j++) {				\
			APPEND_C(' ');					\
		}							\
	}								\
	/* Value. */							\
	APPEND_S(s, slen);						\
	/* Right padding. */						\
	if (left_justify && pad_len != 0) {				\
		size_t j;						\
		for (j = 0; j < pad_len; j++) {				\
			APPEND_C(' ');					\
		}							\
	}								\
} while (0)
#define GET_ARG_NUMERIC(val, len) do {					\
	switch ((unsigned char)len) {					\
	case '?':							\