wget2: Libwget printf functions

| wget2 2.2.1

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Libwget printf functions

## Functions
size_t | wget_vasprintf (char **strp, const char *fmt, va_list args)
size_t | wget_asprintf (char **strp, const char *fmt,...)
char * | wget_vaprintf (const char *fmt, va_list args)
char * | wget_aprintf (const char *fmt,...)
size_t | wget_vfprintf (FILE *fp, const char *fmt, va_list args)
size_t | wget_fprintf (FILE *fp, const char *fmt,...)
size_t | wget_printf (const char *fmt,...)
size_t | wget_vsnprintf (char *str, size_t size, const char *fmt, va_list args)
size_t | wget_snprintf (char *str, size_t size, const char *fmt,...)

## Detailed Description

This is a collection of printf-style functions that are used with libwget and/or Wget2 code. They may be useful to other developers that is why they are exported.

## Function Documentation

## ◆ wget_vasprintf()

size_t wget_vasprintf | ( | char ** | strp,
|  | const char * | fmt,
|  | va_list | args )

Parameters

  [in] | strp | Pointer to hold the string output
  [in] | fmt | Printf-like format specifier
  [in] | args | va_list of arguments

Returns
  Length of the string returned via `strp` or (size_t) -1 on error

Prints arguments to allocated memory and 0-terminates it. The string is returned via the first argument. It has to be free()'d by the caller when it is no longer needed.

## ◆ wget_asprintf()

size_t wget_asprintf | ( | char ** | strp,
|  | const char * | fmt,
|  |  | ... )

Parameters

  [in] | strp | Pointer to hold the string output
  [in] | fmt | Printf-like format specifier
  [in] | ... | List of arguments

Returns
  Length of the string returned via `strp`

Prints arguments to allocated memory and 0-terminates it. The string is returned via the first argument. It has to be free()'d by the caller when it is no longer needed.

## ◆ wget_vaprintf()

char * wget_vaprintf | ( | const char * | fmt,
|  | va_list | args )

Parameters

  [in] | fmt | Printf-like format specifier
  [in] | args | va_list of arguments

Returns
  Pointer to 0-terminated string in memory

Prints arguments to memory and returns a pointer to allocated and 0-terminated chunk of memory. The return value has to be free()'d by the caller when it is no longer needed.

## ◆ wget_aprintf()

char * wget_aprintf | ( | const char * | fmt,
|  |  | ... )

Parameters

  [in] | fmt | Printf-like format specifier
  [in] | ... | List of arguments

Returns
  Pointer to 0-terminated string in memory

Prints arguments to memory and returns a pointer to allocated and 0-terminated chunk of memory. The return value has to be free()'d by the caller when it is no longer needed.

## ◆ wget_vfprintf()

size_t wget_vfprintf | ( | FILE * | fp,
|  | const char * | fmt,
|  | va_list | args )

Parameters

  [in] | fp | FILE pointer
  [in] | fmt | Printf-like format specifier
  [in] | args | List of arguments

Returns
  Number of bytes written or -1 on error

Prints arguments to stream `fp` and returns number of bytes written.

## ◆ wget_fprintf()

size_t wget_fprintf | ( | FILE * | fp,
|  | const char * | fmt,
|  |  | ... )

Parameters

  [in] | fp | FILE pointer
  [in] | fmt | Printf-like format specifier
  [in] | ... | List of arguments

Returns
  Number of bytes written or -1 on error

Prints arguments to stream `fp` and returns number of bytes written.

## ◆ wget_printf()

size_t wget_printf | ( | const char * | fmt,
|  |  | ... )

Parameters

  [in] | fmt | Printf-like format specifier
  [in] | ... | List of arguments

Returns
  Number of bytes written or -1 on error

Prints arguments to stdout and returns number of bytes written.

## ◆ wget_vsnprintf()

size_t wget_vsnprintf | ( | char * | str,
|  | size_t | size,
|  | const char * | fmt,
|  | va_list | args )

Parameters

  [in] | str | Destination buffer
  [in] | size | Size of `str`
  [in] | fmt | Printf-like format specifier
  [in] | args | List of arguments

Returns
  Number of bytes written, or, on truncation, that would have been written

Prints arguments to buffer `str` and returns number of bytes written, or on truncation: that would have been written.

If `str` is NULL the return value are the number of bytes that would have been written.

## ◆ wget_snprintf()

size_t wget_snprintf | ( | char * | str,
|  | size_t | size,
|  | const char * | fmt,
|  |  | ... )

Parameters

  [in] | str | Destination buffer
  [in] | size | Size of `str`
  [in] | fmt | Printf-like format specifier
  [in] | ... | List of arguments

Returns
  Number of bytes written, or, on truncation, that would have been written

Prints arguments to buffer `str` and returns number of bytes written, or on truncation: that would have been written.

If `str` is NULL the return value are the number of bytes that would have been written.