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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 Variable Arguments Output, 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.
Preliminary: | MT-Safe locale | AS-Unsafe corrupt heap | AC-Unsafe mem lock corrupt | See POSIX Safety Concepts.
This function is similar to scanf
, but instead of taking
a variable number of arguments directly, it takes an argument list
pointer ap of type va_list
(see Variadic Functions).
Preliminary: | MT-Safe locale | AS-Unsafe corrupt heap | AC-Unsafe mem lock corrupt | See POSIX Safety Concepts.
This function is similar to wscanf
, but instead of taking
a variable number of arguments directly, it takes an argument list
pointer ap of type va_list
(see Variadic Functions).
Preliminary: | MT-Safe locale | AS-Unsafe corrupt heap | AC-Unsafe mem lock corrupt | See POSIX Safety Concepts.
This is the equivalent of fscanf
with the variable argument list
specified directly as for vscanf
.
Preliminary: | MT-Safe locale | AS-Unsafe corrupt heap | AC-Unsafe mem lock corrupt | See POSIX Safety Concepts.
This is the equivalent of fwscanf
with the variable argument list
specified directly as for vwscanf
.
Preliminary: | MT-Safe locale | AS-Unsafe heap | AC-Unsafe mem | See POSIX Safety Concepts.
This is the equivalent of sscanf
with the variable argument list
specified directly as for vscanf
.
Preliminary: | MT-Safe locale | AS-Unsafe heap | AC-Unsafe mem | See POSIX Safety Concepts.
This is the equivalent of 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 Declaring Attributes of Functions in Using GNU CC.
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