The functions vscanf
and friends are provided so that you can
define your own variadic scanf
-like functions that make use of
the same internals as the built-in formatted output functions.
These functions are analogous to the vprintf
series of output
functions. See section Variable Arguments Output Functions, for important
information on how to use them.
Portability Note: The functions listed in this section were introduced in ISO C99 and were before available as GNU extensions.
scanf
, but instead of taking
a variable number of arguments directly, it takes an argument list
pointer ap of type va_list
(see section Variadic Functions).
wscanf
, but instead of taking
a variable number of arguments directly, it takes an argument list
pointer ap of type va_list
(see section Variadic Functions).
fscanf
with the variable argument list
specified directly as for vscanf
.
fwscanf
with the variable argument list
specified directly as for vwscanf
.
sscanf
with the variable argument list
specified directly as for vscanf
.
swscanf
with the variable argument list
specified directly as for vwscanf
.
In GNU C, there is a special construct you can use to let the compiler
know that a function uses a scanf
-style format string. Then it
can check the number and types of arguments in each call to the
function, and warn you when they do not match the format string.
For details, See section `Declaring Attributes of Functions' in Using GNU CC.
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