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Regenerated for 3.0.
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99
doc/gperf.1
99
doc/gperf.1
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.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.022.
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.TH GPERF "1" "September 2000" "GNU gperf 2.7.2" FSF
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.\" DO NOT MODIFY THIS FILE! It was generated by help2man 1.23.
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.TH GPERF "1" "May 2003" "GNU gperf 3.0" FSF
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.SH NAME
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gperf \- generate a perfect hash function from a key set
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.SH SYNOPSIS
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.B gperf
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[\fIOPTION\fR]... [\fIINPUT-FILE\fR]
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.SH DESCRIPTION
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GNU `gperf' generates perfect hash functions.
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GNU 'gperf' generates perfect hash functions.
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.PP
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If a long option shows an argument as mandatory, then it is mandatory
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for the equivalent short option also.
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.SS "Output file location:"
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.HP
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\fB\-\-output\-file\fR=\fIFILE\fR Write output to specified file.
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.PP
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The results are written to standard output if no output file is specified
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or if it is -.
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.SS "Input file interpretation:"
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.TP
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\fB\-e\fR, \fB\-\-delimiters\fR=\fIDELIMITER\-LIST\fR
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Allow user to provide a string containing delimiters
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used to separate keywords from their attributes.
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Default is ",\en".
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Default is ",".
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.TP
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\fB\-t\fR, \fB\-\-struct\-type\fR
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Allows the user to include a structured type
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@@ -23,6 +29,11 @@ declaration for generated code. Any text before %%
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is considered part of the type declaration. Key
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words and additional fields may follow this, one
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group of fields per line.
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.TP
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\fB\-\-ignore\-case\fR
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Consider upper and lower case ASCII characters as
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equivalent. Note that locale dependent case mappings
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are ignored.
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.SS "Language for the output code:"
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.TP
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\fB\-L\fR, \fB\-\-language\fR=\fILANGUAGE\-NAME\fR
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@@ -39,21 +50,27 @@ structure.
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Initializers for additional components in the keyword
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structure.
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.TP
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\fB\-H\fR, \fB\-\-hash\-fn\-name\fR=\fINAME\fR
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\fB\-H\fR, \fB\-\-hash\-function\-name\fR=\fINAME\fR
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Specify name of generated hash function. Default is
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`hash'.
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\&'hash'.
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.TP
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\fB\-N\fR, \fB\-\-lookup\-fn\-name\fR=\fINAME\fR
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\fB\-N\fR, \fB\-\-lookup\-function\-name\fR=\fINAME\fR
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Specify name of generated lookup function. Default
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name is `in_word_set'.
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name is 'in_word_set'.
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.TP
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\fB\-Z\fR, \fB\-\-class\-name\fR=\fINAME\fR
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Specify name of generated C++ class. Default name is
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`Perfect_Hash'.
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\&'Perfect_Hash'.
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.TP
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\fB\-7\fR, \fB\-\-seven\-bit\fR
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Assume 7-bit characters.
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.TP
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\fB\-l\fR, \fB\-\-compare\-lengths\fR
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Compare key lengths before trying a string
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comparison. This is necessary if the keywords
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contain NUL bytes. It also helps cut down on the
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number of string comparisons made during the lookup.
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.TP
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\fB\-c\fR, \fB\-\-compare\-strncmp\fR
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Generate comparison code using strncmp rather than
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strcmp.
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@@ -70,14 +87,27 @@ lookup function rather than with defines.
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Include the necessary system include file <string.h>
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at the beginning of the code.
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.TP
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\fB\-G\fR, \fB\-\-global\fR
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\fB\-G\fR, \fB\-\-global\-table\fR
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Generate the static table of keywords as a static
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global variable, rather than hiding it inside of the
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lookup function (which is the default behavior).
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.TP
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\fB\-P\fR, \fB\-\-pic\fR
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Optimize the generated table for inclusion in shared
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libraries. This reduces the startup time of programs
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using a shared library containing the generated code.
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.TP
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\fB\-Q\fR, \fB\-\-string\-pool\-name\fR=\fINAME\fR
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Specify name of string pool generated by option \fB\-\-pic\fR.
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Default name is 'stringpool'.
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.TP
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\fB\-\-null\-strings\fR
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Use NULL strings instead of empty strings for empty
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keyword table entries.
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.TP
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\fB\-W\fR, \fB\-\-word\-array\-name\fR=\fINAME\fR
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Specify name of word list array. Default name is
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`wordlist'.
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\&'wordlist'.
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.TP
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\fB\-S\fR, \fB\-\-switch\fR=\fICOUNT\fR
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Causes the generated C code to use a switch
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@@ -99,30 +129,23 @@ defined elsewhere.
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.TP
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\fB\-k\fR, \fB\-\-key\-positions\fR=\fIKEYS\fR
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Select the key positions used in the hash function.
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The allowable choices range between 1-126, inclusive.
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The allowable choices range between 1-255, inclusive.
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The positions are separated by commas, ranges may be
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used, and key positions may occur in any order.
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Also, the meta-character '*' causes the generated
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hash function to consider ALL key positions, and $
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indicates the ``final character'' of a key, e.g.,
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indicates the "final character" of a key, e.g.,
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$,1,2,4,6-10.
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.TP
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\fB\-l\fR, \fB\-\-compare\-strlen\fR
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Compare key lengths before trying a string
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comparison. This helps cut down on the number of
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string comparisons made during the lookup.
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.TP
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\fB\-D\fR, \fB\-\-duplicates\fR
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Handle keywords that hash to duplicate values. This
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is useful for certain highly redundant keyword sets.
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.TP
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\fB\-f\fR, \fB\-\-fast\fR=\fIITERATIONS\fR
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Generate the gen-perf.hash function ``fast''. This
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decreases gperf's running time at the cost of
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minimizing generated table size. The numeric
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argument represents the number of times to iterate
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when resolving a collision. `0' means ``iterate by
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the number of keywords''.
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\fB\-m\fR, \fB\-\-multiple\-iterations\fR=\fIITERATIONS\fR
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Perform multiple choices of the \fB\-i\fR and \fB\-j\fR values,
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and choose the best results. This increases the
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running time by a factor of ITERATIONS but does a
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good job minimizing the generated table size.
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.TP
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\fB\-i\fR, \fB\-\-initial\-asso\fR=\fIN\fR
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Provide an initial value for the associate values
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@@ -130,7 +153,7 @@ array. Default is 0. Setting this value larger helps
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inflate the size of the final table.
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.TP
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\fB\-j\fR, \fB\-\-jump\fR=\fIJUMP\-VALUE\fR
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Affects the ``jump value'', i.e., how far to advance
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Affects the "jump value", i.e., how far to advance
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the associated character value upon collisions. Must
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be an odd number, default is 5.
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.TP
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@@ -138,25 +161,20 @@ be an odd number, default is 5.
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Do not include the length of the keyword when
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computing the hash function.
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.TP
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\fB\-o\fR, \fB\-\-occurrence\-sort\fR
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Reorders input keys by frequency of occurrence of
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the key sets. This should decrease the search time
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dramatically.
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.TP
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\fB\-r\fR, \fB\-\-random\fR
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Utilizes randomness to initialize the associated
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values table.
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.TP
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\fB\-s\fR, \fB\-\-size\-multiple\fR=\fIN\fR
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Affects the size of the generated hash table. The
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numeric argument N indicates ``how many times larger
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or smaller'' the associated value range should be,
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numeric argument N indicates "how many times larger
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or smaller" the associated value range should be,
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in relationship to the number of keys, e.g. a value
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of 3 means ``allow the maximum associated value to
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of 3 means "allow the maximum associated value to
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be about 3 times larger than the number of input
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keys.'' Conversely, a value of \fB\-3\fR means ``make the
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keys". Conversely, a value of 1/3 means "make the
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maximum associated value about 3 times smaller than
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the number of input keys. A larger table should
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the number of input keys". A larger table should
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decrease the time required for an unsuccessful
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search, at the expense of extra table space. Default
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value is 1.
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@@ -171,8 +189,15 @@ Print the gperf version number.
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\fB\-d\fR, \fB\-\-debug\fR
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Enables the debugging option (produces verbose
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output to the standard error).
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.SH AUTHOR
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Written by Douglas C. Schmidt and Bruno Haible.
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.SH "REPORTING BUGS"
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Report bugs to <bug-gnu-utils@gnu.org>.
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Report bugs to <bug-gnu-gperf@gnu.org>.
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.SH COPYRIGHT
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Copyright \(co 1989-1998, 2000-2003 Free Software Foundation, Inc.
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.br
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This is free software; see the source for copying conditions. There is NO
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warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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.SH "SEE ALSO"
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The full documentation for
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.B gperf
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