vsscanf
int vsscanf(const char * __restrict, const char * __restrict, __va_list)
ret = vsscanf(ibuf, fmt, ap);
extern int vsscanf(const char *, const char *, va_list);
extern int vsscanf(const char *_RESTRICT_KYWD, const char *_RESTRICT_KYWD,
j = vsscanf(tempstring, format, ap);
ret = vsscanf(str, fmt, ap);
vsscanf(const char *str, const char *fmt, va_list ap)
if (vsscanf(val, fmt, ap) != 1)