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The ber_printf function is used to encode a BER element and is similar to sprintf_s. One important difference is that state data is stored in the BerElement argument so that multiple calls can be made to ber_printf to append to the end of the BER element. The BerElement argument passed to this function must be a pointer to a BerElement returned by ber_alloc_t.
Syntax
WINBERAPI INT BERAPI ber_printf(
[in, out] BerElement *pBerElement,
[in] PSTR fmt,
...
);
Parameters
[in, out] pBerElement
A pointer to the encoded BerElement structure.
[in] fmt
An encoding format string. For more information, see Remarks.
...
The values to be encoded as specified by the fmt argument.
Return value
If the function succeeds, a non-negative number is returned. If the function fails, -1 is returned.
Remarks
The format string can contain format characters listed in the following table.
| Character | Description |
|---|---|
| t | Tag. The next argument is a ber_tag_t that specifies the tag to override the next element written to the BerElement. This works across calls. |
| b | Boolean. The next argument is an ber_int_t, that contains either 0 for FALSE or 1 for TRUE. A Boolean element is output. If this format character is not preceded by the t format modifier, the tag 0x01U is used for the element. |
| e | Enumerated. The next argument is a ber_int_t, that contains the enumerated value. An enumerated element is output. If this format character is not preceded by the t format modifier, the tag 0x0AU is used for the element. |
| i | Integer. The next argument is a ber_int_t, that contains the integer value. An integer element is output. If this format character is not preceded by the t format modifier, the tag 0x02U is used for the element. |
| n | Null. No argument is required. An ASN.1 NULL element is output. If this format character is not preceded by the t format modifier, the tag 0x05U is used for the element. |
| o | Octet string. The next two arguments are a char*, followed by a ber_len_t with the length of the string. The string may contain NULL bytes and do not have to be zero-terminated. An octet string element is output and no character format conversions on the string data is performed. Passing a NULL pointer followed by a length of 0 is acceptable if a NULL octet string element is required. If this format character is not preceded by the t format modifier, the tag 0x04U is used for the element. |
| s | Octet string. The next argument is a char* pointing to a zero-terminated ANSI character string. The ANSI string characters are converted to UTF-8 format and an octet string element is output, which does not include the trailing '\0' (null) byte. Passing a NULL pointer is acceptable if a NULL octet string element is required. If this format character is not preceded by the t format modifier, the tag 0x04U is used for the element. |
| v | Several octet strings. The next argument is a char**, an array of char* pointers to zero-terminated ANSI strings. The last element in the array must be a NULL pointer. The octet strings do not include the trailing '\0' (null) byte. Be aware that a construct like {v} is used to get an actual SEQUENCE OF octet strings. The t format modifier cannot be used with this format character. |
| V | Several octet strings. A NULL-terminated array of berval* is supplied. Be aware that a construct like {v} is used to get an actual SEQUENCE OF octet strings. The t format modifier cannot be used with this format character. |
| X | Bitstring. The next two arguments are a char* pointer to the start of the bitstring, followed by a ber_len_t that contains the number of bits in the bitstring. A bitstring element is output. If this format character is not preceded by the t format modifier, the tag 0x03U is used for the element. |
| { | Begin sequence. No argument is required. If this format character is not preceded by the t format modifier, the tag 0x30U is used. |
| } | End sequence. No argument is required. The t format modifier cannot be used with this format character. |
| [ | Begin set. No argument is required. If this format character is not preceded by the t format modifier, the tag 0x31U is used. |
| ] | End set. No argument is required. The t format modifier cannot be used with this format character. |
Each left brace ({) character must be paired with a right brace (}) character later in the format string, or in the format string of a subsequent call to ber_printf for that specific BerElement. The same applies to the left bracket ([) character and right bracket (]) characters.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Windows Vista |
| Minimum supported server | Windows Server 2008 |
| Target Platform | Windows |
| Header | winber.h |
| Library | Wldap32.lib |
| DLL | Wldap32.dll |