shishi_asn1_read_optional3
Api function
Usage
#include <shishi.h>
int shishi_asn1_read_optional(Shishi * handle, Shishi_asn1 node, const char * field, char ** data, size_t * datalen);
Arguments
Shishi * handle
|
shishi handle as allocated by |
|---|---|
Shishi_asn1 node
|
ASN.1 variable to read field from. |
const char * field
|
name of field in node to read. |
char ** data
|
newly allocated output buffer that will hold ASN.1 field data. |
size_t * datalen
|
actual size of output buffer. |
Overview
Extract data stored in a ASN.1 field into a newly allocated buffer. If the field does not exist (i.e., SHISHI_ASN1_NO_ELEMENT), this function set datalen to 0 and succeeds. Can be useful to read ASN.1 fields which are marked OPTIONAL in the grammar, if you want to avoid special error handling in your code.
Return value
Returns SHISHI_OK if successful, SHISHI_ASN1_NO_VALUE if the field has no value, ot SHISHI_ASN1_ERROR otherwise.
Releases
10 releases since Debian 4.0 (Etch); the text changed 5 times.