Utility Functions and C Language Reference > Utility Functions: C Language (lr_) > Alphabetical Listing > lr_param_increment


Increments the value of a numerical parameter.

C Language

int lr_param_increment( char *destination_param, char *source_param ); 
Example: lr_param_increment Run-Time Functions


Name Comments
destination_param The name of the parameter to store the incremented parameter
source_param The name of the parameter whose value is incremented

The lr_param_increment function retrieves the value of source_param, increments its value by one, and stores the incremented value as a null terminated string in destination_param.

This function is useful only in protocols that have a numerical parameter type. For protocols that have only string parameters, increment with C functions. For example:

     i = atoi(lr_eval_string("{modification_num}"));
     sprintf(buf, "%d", i+1);
     lr_save_string(buf, "next_modnum");

For protocols that have a numerical parameter, lr_param_increment can be used:

     lr_param_increment("next_modnum", "{modification_num}");

source_param must be initialized with an integer value prior to calling lr_param_increment. source_param's value should include only single-byte digit characters with an optional sign or leading zeros.

When destination_param exists, its value is overwritten. When it doesn't exist, the parameter is created dynamically.

The value of source_param is restricted to the maximum value of a long integer minus 1.

Return Values

This function returns the following values:

Enum Value Result
LR_PARAM_INC_OK  0 Success
LR_PARAM_INC_ERR_SAVE_FAILED -1 The save operation to the destination parameter failed.
LR_PARAM_INC_ERR_MBCS_IN_SRC -2 The source parameter includes multibyte characters, which indicates that it is not a pure numeric parameter.
LR_PARAM_INC_ERR_SRC_NOT_NUM -3 The source parameter includes singlebyte characters that are not digits, or the source parameter does not exist.
LR_PARAM_INC_ERR_EVAL_FAILED -4 The evaluation operation of the source parameter failed.


Standard parameterization is not available for this function.