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C API providing a middleware abstraction layer which is used to implement the rest of ROS.
Macros | Functions
validate_full_topic_name.h File Reference
#include "rmw/macros.h"
#include "rmw/types.h"
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#define RMW_TOPIC_VALID   0
#define RMW_TOPIC_MAX_NAME_LENGTH   255U /* impl constraint */ - 8U /* reserved for prefixes */


rmw_ret_t rmw_validate_full_topic_name (const char *topic_name, int *validation_result, size_t *invalid_index)
 Determine if a given fully qualified topic name is valid. More...
rmw_ret_t rmw_validate_full_topic_name_with_size (const char *topic_name, size_t topic_name_length, int *validation_result, size_t *invalid_index)
 Deterimine if a given topic name is valid. More...
const char * rmw_full_topic_name_validation_result_string (int validation_result)
 Return a validation result description, or NULL if unknown or RMW_TOPIC_VALID. More...

Macro Definition Documentation


#define RMW_TOPIC_VALID   0
















#define RMW_TOPIC_MAX_NAME_LENGTH   255U /* impl constraint */ - 8U /* reserved for prefixes */

Function Documentation

◆ rmw_validate_full_topic_name()

rmw_ret_t rmw_validate_full_topic_name ( const char *  topic_name,
int *  validation_result,
size_t *  invalid_index 

Determine if a given fully qualified topic name is valid.

Validity of a FQN for topic is determined based on rules defined here:


Note that this function expects any URL suffixes as described in the above document to have already been removed.

If either the C string or validation_result pointer are null, then RMW_RET_INVALID_ARGUMENT will be returned. The topic_name should be a valid, null-terminated C string. The validation_result int pointer should point to valid memory so a result can be stored in it as an output variable. The invalid_index size_t pointer should either point NULL or to valid memory so in the event of a validation error, the location in the input string can be stored therein. If NULL is passed in for invalid_index, it will be not be set.

The invalid_index will not be assigned a value if the topic is valid.

The int which validation_result points to will have a one of a few possible results values (defined with macros) stored into it:


The result value can be converted to a description with the rmw_full_topic_name_validation_result_string() function.

The RMW_TOPIC_INVALID_TOO_LONG is guaranteed to be checked last, such that if you get that result, then you can assume all other checks succeeded. This is done so that the length limit can be treated as a warning rather than an error if desired.

[in]topic_nametopic name to be validated
[out]validation_resultint in which the result of the check is stored
[out]invalid_indexsize_t index of the input string where an error occurred
RMW_RET_OK on successfully running the check, or
RMW_RET_INVALID_ARGUMENT on invalid parameters, or
RMW_RET_ERROR when an unspecified error occurs.

◆ rmw_validate_full_topic_name_with_size()

rmw_ret_t rmw_validate_full_topic_name_with_size ( const char *  topic_name,
size_t  topic_name_length,
int *  validation_result,
size_t *  invalid_index 

Deterimine if a given topic name is valid.

This is an overload with an extra parameter for the length of topic_name.

[in]topic_name_lengthThe number of characters in topic_name.
See also
rmw_validate_full_topic_name(const char *, int *, size_t *)

◆ rmw_full_topic_name_validation_result_string()

const char* rmw_full_topic_name_validation_result_string ( int  validation_result)

Return a validation result description, or NULL if unknown or RMW_TOPIC_VALID.