(libc.info.gz) Variable Arguments Input

Info Catalog (libc.info.gz) Formatted Input Functions (libc.info.gz) Formatted Input
 
 12.14.9 Variable Arguments Input Functions
 ------------------------------------------
 
 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.  
 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.
 
  -- Function: int vscanf (const char *TEMPLATE, va_list AP)
      Preliminary: | MT-Safe locale | AS-Unsafe corrupt heap | AC-Unsafe
      mem lock corrupt |  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' ( Variadic Functions).
 
  -- Function: int vwscanf (const wchar_t *TEMPLATE, va_list AP)
      Preliminary: | MT-Safe locale | AS-Unsafe corrupt heap | AC-Unsafe
      mem lock corrupt |  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' ( Variadic Functions).
 
  -- Function: int vfscanf (FILE *STREAM, const char *TEMPLATE, va_list
           AP)
      Preliminary: | MT-Safe locale | AS-Unsafe corrupt heap | AC-Unsafe
      mem lock corrupt |  POSIX Safety Concepts.
 
      This is the equivalent of 'fscanf' with the variable argument list
      specified directly as for 'vscanf'.
 
  -- Function: int vfwscanf (FILE *STREAM, const wchar_t *TEMPLATE,
           va_list AP)
      Preliminary: | MT-Safe locale | AS-Unsafe corrupt heap | AC-Unsafe
      mem lock corrupt |  POSIX Safety Concepts.
 
      This is the equivalent of 'fwscanf' with the variable argument list
      specified directly as for 'vwscanf'.
 
  -- Function: int vsscanf (const char *S, const char *TEMPLATE, va_list
           AP)
      Preliminary: | MT-Safe locale | AS-Unsafe heap | AC-Unsafe mem |
       POSIX Safety Concepts.
 
      This is the equivalent of 'sscanf' with the variable argument list
      specified directly as for 'vscanf'.
 
  -- Function: int vswscanf (const wchar_t *S, const wchar_t *TEMPLATE,
           va_list AP)
      Preliminary: | MT-Safe locale | AS-Unsafe heap | AC-Unsafe mem |
       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 (gcc.info)Function
 Attributes.
 
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