Sure how do you do that?

benwills · on May 4, 2023

Here's a sample gperf config file I just recently used/auto-generated (with the data labels modified):

  struct SomeData_Gperf_st {
    const char* strKey;
    SomeData_et enumVal;
  };
  %compare-lengths
  %compare-strncmp
  %enum
  %ignore-case
  %includes
  %readonly-tables
  %struct-type
  %define slot-name            strKey
  %define lookup-function-name SomeData_Find
  %%
  val 1, SOME_DATA__VAL_1
  val 2, SOME_DATA__VAL_2

The important option here is the %struct-type option. Using that, it will find and parse the struct definition (above in the configuration), and use that to create the objects in the lookup table.

The lookup table is defined after the two percent signs; %%. You simply use comma separated values. And then you just have to define the const char* to use for the lookup string, as defined by `%define slot-name`

So, gperf will then generate a function, SomeData_Find(), which returns a pointer to a SomeData_Gperf_st object. Or NULL if it's not found.

There are a number of other options available, but what you're seeing above are the options I use most often.

And, finally, I execute a command like this to run it with that config:

  gperf SomeData.gperf.confg --output-file=SomeData_Find.c --multiple-iterations=100

benwills · on May 4, 2023

Also, if you get stuck with it or want to configure it differently (eg: using a struct definition or values defined elsewhere), feel free to reach out to my username at gmail.

Just make sure to use a dot between my first and last name.