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Add some documentation to the new history code, and fix some minor code issues

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darcs-hash:20061020230420-ac50b-39a08d68b82481514b0d6c1024a12618bf329d57.gz
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axel 2006-10-21 09:04:20 +10:00
parent 9dc1a7d5e9
commit bb4e166b37
1 changed files with 146 additions and 56 deletions
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202
history.c
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@ -27,16 +27,8 @@
#include "halloc_util.h"
#include "intern.h"
#include "path.h"
/*
#include "reader.h"
#include "env.h"
#include "sanity.h"
#include "signal.h"
*/
#define WIDE_MODE 0
#define NARROW_MODE 1
/**
Interval in seconds between automatic history save
@ -48,29 +40,93 @@
*/
#define SAVE_COUNT 5
/**
A struct representiong a history list
*/
typedef struct
{
/**
The name of this list. Used for picking a suitable filename and for switching modes.
*/
const wchar_t *name;
/**
The items of the list. Each entry may be either a pointer to an
item_t struct or a pointer to an mmaped memory region where a
multibyte string representing the item is stored. Use the
item_get function to always get an item_t.
*/
array_list_t item;
/**
The current history position
*/
int pos;
/**
This flag is set nonzero if the file containing earlier saves has ben mmaped in
*/
int has_loaded;
/**
The mmaped region for the history file
*/
char *mmap_start;
/**
The size of the mmaped region
*/
size_t mmap_length;
/**
A list of indices of all previous search maches. This is used to eliminate duplicate search results.
*/
array_list_t used;
/**
Timestamp of last save
*/
time_t save_timestamp;
/**
Number of entries that have been added since last save
*/
int new_count;
/**
A halloc context. This context is free'd every time the history
is saved. Therefore it is very well suited for use as the
context for history item data.
*/
void *item_context;
}
history_mode_t;
/**
This struct represents a history item
*/
typedef struct
{
/**
The actual contents of the entry
*/
wchar_t *data;
/**
Original creation time for the entry
*/
time_t timestamp;
}
item_t;
/**
Table of all history modes
*/
static hash_table_t *mode_table=0;
/**
The surrent history mode
*/
static history_mode_t *current_mode=0;
/**
@ -184,6 +240,11 @@ static int item_is_new( history_mode_t *m, void *d )
return 0;
}
/**
Returns an item_t for the specified adress. The adress must come from the item list of the specified mode.
Later calls to this function may erase the output of a previous call to this function.
*/
static item_t *item_get( history_mode_t *m, void *d )
{
char *begin = (char *)d;
@ -293,12 +354,18 @@ static item_t *item_get( history_mode_t *m, void *d )
}
/**
Write the specified item to the specified file.
*/
static void item_write( FILE *f, history_mode_t *m, void *v )
{
item_t *i = item_get( m, v );
fwprintf( f, L"# %d\n%ls\n", i->timestamp, history_escape_newlines( i->data ) );
}
/**
Release all memory used by the specified history mode.
*/
static void history_destroy_mode( wchar_t *name, history_mode_t *m )
{
halloc_free( m->item_context );
@ -311,6 +378,9 @@ static void history_destroy_mode( wchar_t *name, history_mode_t *m )
halloc_free( m );
}
/**
Create a new empty mode with the specified name
*/
static history_mode_t *history_create_mode( const wchar_t *name )
{
history_mode_t *new_mode = halloc( 0, sizeof( history_mode_t ));
@ -342,7 +412,13 @@ static int history_test( const wchar_t *needle, const wchar_t *haystack )
return !!wcsstr( haystack, needle );
}
/**
Returns the name of the save file for a mode.
\param context a halloc context used to allocate memory
\param name the name of the hstory mode
\param suffix an optional file suffix
*/
static wchar_t *history_filename( void *context, const wchar_t *name, const wchar_t *suffix )
{
wchar_t *path;
@ -361,6 +437,9 @@ static wchar_t *history_filename( void *context, const wchar_t *name, const wcha
return res;
}
/**
Go through the mmaped region and insert pointers to suitable loacations into the item list
*/
static void history_populate_from_mmap( history_mode_t *m )
{
char *begin = m->mmap_start;
@ -416,7 +495,9 @@ static void history_populate_from_mmap( history_mode_t *m )
}
/**
Load contents of the backing file to memory
*/
static void history_load( history_mode_t *m )
{
int fd;
@ -428,6 +509,8 @@ static void history_load( history_mode_t *m )
if( !m )
return;
signal_block();
context = halloc( 0, 0 );
filename = history_filename( context, m->name, 0 );
@ -444,7 +527,6 @@ static void history_load( history_mode_t *m )
if( (m->mmap_start = mmap( 0, m->mmap_length, PROT_READ, MAP_SHARED, fd, 0 )) != MAP_FAILED )
{
ok = 1;
// debug( 0, L"mmap ok" );
history_populate_from_mmap( m );
}
}
@ -453,22 +535,24 @@ static void history_load( history_mode_t *m )
}
}
if( !ok )
{
// debug( 0, L"Could not load history file" );
}
m->has_loaded=1;
halloc_free( context );
signal_unblock();
}
/**
Hash function for item_t struct
*/
static int hash_item_func( void *v )
{
item_t *i = (item_t *)v;
return i->timestamp ^ hash_wcs_func( i->data );
}
/**
Comparison function for item_t struct
*/
static int hash_item_cmp( void *v1, void *v2 )
{
item_t *i1 = (item_t *)v1;
@ -476,6 +560,9 @@ static int hash_item_cmp( void *v1, void *v2 )
return (i1->timestamp == i2->timestamp) && (wcscmp( i1->data, i2->data )==0);
}
/**
Save the specified mode to file
*/
static void history_save_mode( void *n, history_mode_t *m )
{
FILE *out;
@ -503,6 +590,8 @@ static void history_save_mode( void *n, history_mode_t *m )
return;
}
signal_block();
/*
Set up on_disk variable to describe the current contents of the history file
*/
@ -525,51 +614,50 @@ static void history_save_mode( void *n, history_mode_t *m )
for( i=0; i<al_get_count(&m->item); i++ )
{
void *ptr = al_get( &m->item, i );
int is_new = item_is_new( m, ptr );
if( is_new )
{
hash_put( &mine, item_get( m, ptr ), L"" );
void *ptr = al_get( &m->item, i );
int is_new = item_is_new( m, ptr );
if( is_new )
{
hash_put( &mine, item_get( m, ptr ), L"" );
}
}
}
/*
Re-save the old history
*/
for( i=0; i<al_get_count(&on_disk->item); i++ )
{
void *ptr = al_get( &on_disk->item, i );
item_t *i = item_get( on_disk, ptr );
// assert( i );
if( !hash_get( &mine, i ) )
item_write( out, on_disk, ptr );
}
hash_destroy( &mine );
/*
Add our own items
*/
for( i=0; i<al_get_count(&m->item); i++ )
{
void *ptr = al_get( &m->item, i );
int is_new = item_is_new( m, ptr );
if( is_new )
item_write( out, m, ptr );
}
if( fclose( out ) )
{
}
else
{
wrename( tmp_name, history_filename( context, m->name, 0 ) );
}
/*
Re-save the old history
*/
for( i=0; i<al_get_count(&on_disk->item); i++ )
{
void *ptr = al_get( &on_disk->item, i );
item_t *i = item_get( on_disk, ptr );
if( !hash_get( &mine, i ) )
item_write( out, on_disk, ptr );
}
hash_destroy( &mine );
/*
Add our own items
*/
for( i=0; i<al_get_count(&m->item); i++ )
{
void *ptr = al_get( &m->item, i );
int is_new = item_is_new( m, ptr );
if( is_new )
item_write( out, m, ptr );
}
if( fclose( out ) )
{
}
else
{
wrename( tmp_name, history_filename( context, m->name, 0 ) );
}
}
free( tmp_name );
}
history_destroy_mode( 0, on_disk);
if( m->mmap_start && (m->mmap_start != MAP_FAILED ) )
@ -586,6 +674,8 @@ static void history_save_mode( void *n, history_mode_t *m )
m->save_timestamp=time(0);
m->new_count = 0;
signal_unblock();
halloc_free( context );
}
@ -597,7 +687,7 @@ void history_add( const wchar_t *str )
if( !current_mode )
return;
i = halloc( global_context, sizeof(item_t));
i = halloc( current_mode->item_context, sizeof(item_t));
i->data = (wchar_t *)halloc_wcsdup( current_mode->item_context, str );
i->timestamp = time(0);