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Update udf examples #4

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76 changes: 73 additions & 3 deletions src/udfexample.c
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Original file line number Diff line number Diff line change
Expand Up @@ -10,12 +10,16 @@
// CREATE FUNCTION sequence RETURNS INT SONAME 'udfexample.so';
// CREATE FUNCTION strtoint RETURNS INT SONAME 'udfexample.so';
// CREATE FUNCTION avgmva RETURNS FLOAT SONAME 'udfexample.so';
// CREATE FUNCTION asciitolower RETURNS STRING SONAME 'udfexample.so';
// CREATE PLUGIN square_wc_rank TYPE 'ranker' SONAME 'udfexample.so';
//
// Windows
// cl /MTd /LD udfexample.c
// CREATE FUNCTION sequence RETURNS INT SONAME 'udfexample.dll';
// CREATE FUNCTION strtoint RETURNS INT SONAME 'udfexample.dll';
// CREATE FUNCTION avgmva RETURNS FLOAT SONAME 'udfexample.dll';
// CREATE FUNCTION asciitolower RETURNS STRING SONAME 'udfexample.dll';
// CREATE PLUGIN square_wc_rank TYPE 'ranker' SONAME 'udfexample.dll';
//

#include "sphinxudf.h"
Expand Down Expand Up @@ -120,8 +124,9 @@ DLLEXPORT sphinx_int64_t strtoint ( SPH_UDF_INIT * init, SPH_UDF_ARGS * args, ch

while ( len>0 && *s>='0' && *s<='9' )
{
res += *s - '0';
res = *s - '0' + 10 * res;
len--;
s++;
}

return res;
Expand Down Expand Up @@ -195,8 +200,73 @@ DLLEXPORT double avgmva ( SPH_UDF_INIT * init, SPH_UDF_ARGS * args, char * error
return res/n;
}

// FIXME! add a string function example?
// FIXME! add a ranker plugin example?
//////////////////////////////////////////////////////////////////////////

DLLEXPORT int asciitolower_init ( SPH_UDF_INIT * init, SPH_UDF_ARGS * args, char * error_message )
{
if ( args->arg_count!=1 || args->arg_types[0]!=SPH_UDF_TYPE_STRING )
{
snprintf ( error_message, SPH_UDF_ERROR_LEN, "ASCIITOLOWER() requires 1 string argument" );
return 1;
}

return 0;
}

DLLEXPORT char * asciitolower ( SPH_UDF_INIT * init, SPH_UDF_ARGS * args, char * error_flag )
{
char * in;
char * out;
int i, len;

len = args->str_lengths[0];
in = args->arg_values[0];
out = args->fn_malloc(len + 1);
for ( i=0; i<len; i++ )
{
if ( in[i] >= 'A' && in[i] <= 'Z' )
out[i] = in[i] - 'A' + 'a';
else
out[i] = in[i];
}
out[len] = '\0';

return out;
}

//////////////////////////////////////////////////////////////////////////

DLLEXPORT int square_wc_rank_init ( void ** userdata, SPH_RANKER_INIT * ranker, char * error )
{
*userdata = (void*) malloc ( sizeof(int) );
**(int**)userdata = 0;

return 0;
}

DLLEXPORT void square_wc_rank_update ( void * userdata, SPH_RANKER_HIT * hit )
{
++*(int*)userdata;
}

DLLEXPORT int square_wc_rank_finalize ( void * userdata, int match_weight )
{
int word_count;

word_count = *(int*)userdata;
*(int*)userdata = 0;
return word_count * word_count;
}

DLLEXPORT int square_wc_rank_deinit ( void * userdata )
{
if ( userdata )
{
free ( userdata );
userdata = NULL;
}
return 0;
}

//
// $Id$
Expand Down