(gperf.info.gz) Output Details

(gperf.info.gz) Algorithmic Details
 
 Options for fine tuning Details in the Output Code
 ==================================================
 
 `-K KEY-NAME'
 `--slot-name=KEY-NAME'
      This option is only useful when option `-t' has been given.  By
      default, the program assumes the structure component identifier for
      the keyword is `name'.  This option allows an arbitrary choice of
      identifier for this component, although it still must occur as the
      first field in your supplied `struct'.
 
 `-F INITIALIZERS'
 `--initializer-suffix=INITIALIZERS'
      This option is only useful when option `-t' has been given.  It
      permits to specify initializers for the structure members following
      KEY NAME in empty hash table entries.  The list of initializers
      should start with a comma.  By default, the emitted code will
      zero-initialize structure members following KEY NAME.
 
 `-H HASH-FUNCTION-NAME'
 `--hash-fn-name=HASH-FUNCTION-NAME'
      Allows you to specify the name for the generated hash function.
      Default name is `hash'.  This option permits the use of two hash
      tables in the same file.
 
 `-N LOOKUP-FUNCTION-NAME'
 `--lookup-fn-name=LOOKUP-FUNCTION-NAME'
      Allows you to specify the name for the generated lookup function.
      Default name is `in_word_set'.  This option permits completely
      automatic generation of perfect hash functions, especially when
      multiple generated hash functions are used in the same application.
 
 `-Z CLASS-NAME'
 `--class-name=CLASS-NAME'
      This option is only useful when option `-L C++' has been given.  It
      allows you to specify the name of generated C++ class.  Default
      name is `Perfect_Hash'.
 
 `-7'
 `--seven-bit'
      This option specifies that all strings that will be passed as
      arguments to the generated hash function and the generated lookup
      function will solely consist of 7-bit ASCII characters (characters
      in the range 0..127).  (Note that the ANSI C functions `isalnum'
      and `isgraph' do _not_ guarantee that a character is in this
      range. Only an explicit test like `c >= 'A' && c <= 'Z''
      guarantees this.) This was the default in versions of `gperf'
      earlier than 2.7; now the default is to assume 8-bit characters.
 
 `-c'
 `--compare-strncmp'
      Generates C code that uses the `strncmp' function to perform
      string comparisons.  The default action is to use `strcmp'.
 
 `-C'
 `--readonly-tables'
      Makes the contents of all generated lookup tables constant, i.e.,
      "readonly".  Many compilers can generate more efficient code for
      this by putting the tables in readonly memory.
 
 `-E'
 `--enum'
      Define constant values using an enum local to the lookup function
      rather than with #defines.  This also means that different lookup
      functions can reside in the same file.  Thanks to James Clark
      `<jjc@ai.mit.edu>'.
 
 `-I'
 `--includes'
      Include the necessary system include file, `<string.h>', at the
      beginning of the code.  By default, this is not done; the user must
      include this header file himself to allow compilation of the code.
 
 `-G'
 `--global'
      Generate the static table of keywords as a static global variable,
      rather than hiding it inside of the lookup function (which is the
      default behavior).
 
 `-W HASH-TABLE-ARRAY-NAME'
 `--word-array-name=HASH-TABLE-ARRAY-NAME'
      Allows you to specify the name for the generated array containing
      the hash table.  Default name is `wordlist'.  This option permits
      the use of two hash tables in the same file, even when the option
      `-G' is given.
 
 `-S TOTAL-SWITCH-STATEMENTS'
 `--switch=TOTAL-SWITCH-STATEMENTS'
      Causes the generated C code to use a `switch' statement scheme,
      rather than an array lookup table.  This can lead to a reduction
      in both time and space requirements for some keyfiles.  The
      argument to this option determines how many `switch' statements
      are generated. A value of 1 generates 1 `switch' containing all
      the elements, a value of 2 generates 2 tables with 1/2 the
      elements in each `switch', etc.  This is useful since many C
      compilers cannot correctly generate code for large `switch'
      statements. This option was inspired in part by Keith Bostic's
      original C program.
 
 `-T'
 `--omit-struct-type'
      Prevents the transfer of the type declaration to the output file.
      Use this option if the type is already defined elsewhere.
 
 `-p'
      This option is supported for compatibility with previous releases
      of `gperf'. It does not do anything.
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