mirror of
https://github.com/fish-shell/fish-shell.git
synced 2024-11-23 14:40:37 +08:00
1051 lines
17 KiB
C
1051 lines
17 KiB
C
/** \file util.c
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Generic utilities library.
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Contains datastructures such as hash tables, automatically growing array lists, priority queues, etc.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <wchar.h>
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#include <math.h>
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#include <sys/time.h>
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#include <stdarg.h>
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#include <string.h>
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#include <ctype.h>
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#include <wctype.h>
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#include <unistd.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <dirent.h>
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#include <errno.h>
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#include "util.h"
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#include "common.h"
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#include "wutil.h"
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/**
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Minimum allocated size for data structures. Used to avoid excessive
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memory allocations for lists, hash tables, etc, which are nearly
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empty.
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*/
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#define MIN_SIZE 32
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/**
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Minimum size for hash tables
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*/
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#define HASH_MIN_SIZE 7
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/**
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Maximum number of characters that can be inserted using a single
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call to sb_printf. This is needed since vswprintf doesn't tell us
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what went wrong. We don't know if we ran out of space or something
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else went wrong. Therefore we assume that any error is an out of
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memory-error and try again until we reach this size.
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*/
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#define SB_MAX_SIZE 32767
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float minf( float a,
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float b )
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{
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return a<b?a:b;
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}
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float maxf( float a,
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float b )
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{
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return a>b?a:b;
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}
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int mini( int a,
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int b )
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{
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return a<b?a:b;
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}
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int maxi( int a,
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int b )
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{
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return a>b?a:b;
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}
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/* Queue functions */
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void q_init( dyn_queue_t *q )
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{
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q->start = (void **)malloc( sizeof(void*)*1 );
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q->stop = &q->start[1];
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q->put_pos = q->get_pos = q->start;
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}
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void q_destroy( dyn_queue_t *q )
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{
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free( q->start );
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}
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/*
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static q_print( dyn_queue_t *q )
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{
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int i;
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int size = (q->stop-q->start);
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printf( "Storlek: %d\n", size );
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for( i=0; i< size; i++ )
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{
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printf( " %c%c %d: %d\n",
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&q->start[i]==q->get_pos?'g':' ',
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&q->start[i]==q->put_pos?'p':' ',
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i,
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q->start[i] );
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}
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}
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*/
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/**
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Reallocate the queue_t
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*/
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static int q_realloc( dyn_queue_t *q )
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{
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void **old_start = q->start;
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void **old_stop = q->stop;
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int diff;
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int new_size;
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new_size = 2*(q->stop-q->start);
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q->start=(void**)realloc( q->start, sizeof(void*)*new_size );
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if( q->start == 0 )
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{
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q->start = old_start;
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return 0;
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}
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diff = q->start - old_start;
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q->get_pos += diff;
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q->stop = &q->start[new_size];
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memcpy( old_stop + diff, q->start, sizeof(void*)*(q->get_pos-q->start));
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q->put_pos = old_stop + diff + (q->get_pos-q->start);
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return 1;
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}
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int q_put( dyn_queue_t *q, void *e )
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{
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*q->put_pos = e;
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// fprintf( stderr, "Put element %d to queue %d\n", e, q );
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if( ++q->put_pos == q->stop )
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q->put_pos = q->start;
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if( q->put_pos == q->get_pos )
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return q_realloc( q );
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return 1;
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}
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void *q_get( dyn_queue_t *q)
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{
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void *e = *q->get_pos;
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if( ++q->get_pos == q->stop )
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q->get_pos = q->start;
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return e;
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}
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void *q_peek( dyn_queue_t *q )
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{
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return *q->get_pos;
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}
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int q_empty( dyn_queue_t *q )
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{
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// fprintf( stderr, "Queue %d is %s\n", q, (q->put_pos == q->get_pos)?"empty":"non-empty" );
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return q->put_pos == q->get_pos;
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}
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/* Stack functions */
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/* Hash table functions */
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void hash_init2( hash_table_t *h,
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int (*hash_func)(const void *key),
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int (*compare_func)(const void *key1, const void *key2),
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size_t capacity)
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{
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int i;
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size_t sz = capacity*4/3+1;
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h->arr = malloc( sizeof(hash_struct_t)*sz );
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h->size = sz;
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for( i=0; i< sz; i++ )
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h->arr[i].key = 0;
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h->count=0;
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h->hash_func = hash_func;
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h->compare_func = compare_func;
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}
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void hash_init( hash_table_t *h,
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int (*hash_func)(const void *key),
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int (*compare_func)(const void *key1, const void *key2) )
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{
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h->arr = 0;
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h->size = 0;
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h->count=0;
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h->hash_func = hash_func;
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h->compare_func = compare_func;
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}
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void hash_destroy( hash_table_t *h )
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{
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free( h->arr );
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}
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/**
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Search for the specified hash key in the table
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\return index in the table, or to the first free index if the key is not in the table
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*/
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static int hash_search( hash_table_t *h,
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const void *key )
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{
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int hv;
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int pos;
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hv = h->hash_func( key );
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pos = abs(hv) % h->size;
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while(1)
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{
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if( (h->arr[pos].key == 0 ) ||
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( h->compare_func( h->arr[pos].key, key ) ) )
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{
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return pos;
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}
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pos++;
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pos %= h->size;
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}
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}
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/**
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Reallocate the hash array. This is quite expensive, as every single entry has to be rehashed and moved.
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*/
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static int hash_realloc( hash_table_t *h,
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int sz )
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{
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/* Avoid reallocating when using pathetically small tables */
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if( ( sz < h->size ) && (h->size < HASH_MIN_SIZE))
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return 1;
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sz = maxi( sz, HASH_MIN_SIZE );
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hash_struct_t *old_arr = h->arr;
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int old_size = h->size;
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int i;
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h->arr = malloc( sizeof( hash_struct_t) * sz );
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if( h->arr == 0 )
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{
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h->arr = old_arr;
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return 0;
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}
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memset( h->arr,
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0,
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sizeof( hash_struct_t) * sz );
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h->size = sz;
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for( i=0; i<old_size; i++ )
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{
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if( old_arr[i].key != 0 )
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{
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int pos = hash_search( h, old_arr[i].key );
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h->arr[pos].key = old_arr[i].key;
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h->arr[pos].data = old_arr[i].data;
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}
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}
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free( old_arr );
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return 1;
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}
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int hash_put( hash_table_t *h,
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const void *key,
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const void *data )
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{
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int pos;
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if( (float)(h->count+1)/h->size > 0.75f )
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{
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if( !hash_realloc( h, (h->size+1) * 2 -1 ) )
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{
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return 0;
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}
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}
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pos = hash_search( h, key );
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if( h->arr[pos].key == 0 )
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{
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h->count++;
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}
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h->arr[pos].key = key;
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h->arr[pos].data = data;
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return 1;
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}
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const void *hash_get( hash_table_t *h,
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const void *key )
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{
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if( !h->count )
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return 0;
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int pos = hash_search( h, key );
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if( h->arr[pos].key == 0 )
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return 0;
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else
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return h->arr[pos].data;
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}
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const void *hash_get_key( hash_table_t *h,
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const void *key )
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{
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if( !h->count )
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return 0;
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int pos = hash_search( h, key );
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if( h->arr[pos].key == 0 )
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return 0;
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else
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return h->arr[pos].key;
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}
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int hash_get_count( hash_table_t *h)
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{
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return h->count;
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}
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void hash_remove( hash_table_t *h,
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const void *key,
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const void **old_key,
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const void **old_val )
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{
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if( !h->count )
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{
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if( old_key != 0 )
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*old_key = 0;
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if( old_val != 0 )
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*old_val = 0;
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return;
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}
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int pos = hash_search( h, key );
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int next_pos;
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if( h->arr[pos].key == 0 )
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{
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if( old_key != 0 )
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*old_key = 0;
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if( old_val != 0 )
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*old_val = 0;
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return;
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}
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h->count--;
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if( old_key != 0 )
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*old_key = h->arr[pos].key;
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if( old_val != 0 )
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*old_val = h->arr[pos].data;
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h->arr[pos].key = 0;
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next_pos = pos+1;
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next_pos %= h->size;
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while( h->arr[next_pos].key != 0 )
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{
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int hv = h->hash_func( h->arr[next_pos].key );
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int ideal_pos = abs( hv ) % h->size;
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int dist_old = (next_pos - ideal_pos + h->size)%h->size;
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int dist_new = (pos - ideal_pos + h->size)%h->size;
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if ( dist_new < dist_old )
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{
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h->arr[pos].key = h->arr[next_pos].key;
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h->arr[pos].data = h->arr[next_pos].data;
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h->arr[next_pos].key = 0;
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pos = next_pos;
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}
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next_pos++;
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next_pos %= h->size;
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}
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if( (float)(h->count+1)/h->size < 0.2f && h->count < 63 )
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{
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hash_realloc( h, (h->size+1) / 2 -1 );
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}
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return;
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}
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int hash_contains( hash_table_t *h,
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const void *key )
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{
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if( !h->count )
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return 0;
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int pos = hash_search( h, key );
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return h->arr[pos].key != 0;
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}
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/**
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Push hash value into array_list_t
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*/
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static void hash_put_data( const void *key,
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const void *data,
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void *al )
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{
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al_push( (array_list_t *)al,
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data );
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}
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void hash_get_data( hash_table_t *h,
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array_list_t *arr )
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{
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hash_foreach2( h, &hash_put_data, arr );
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}
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/**
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Push hash key into array_list_t
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*/
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static void hash_put_key( const void *key, const void *data, void *al )
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{
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al_push( (array_list_t *)al, key );
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}
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void hash_get_keys( hash_table_t *h,
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array_list_t *arr )
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{
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hash_foreach2( h, &hash_put_key, arr );
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}
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void hash_foreach( hash_table_t *h,
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void (*func)(const void *, const void *) )
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{
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int i;
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for( i=0; i<h->size; i++ )
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{
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if( h->arr[i].key != 0 )
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{
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func( h->arr[i].key, h->arr[i].data );
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}
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}
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}
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void hash_foreach2( hash_table_t *h,
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void (*func)( const void *, const void *, void * ),
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void *aux )
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{
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int i;
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for( i=0; i<h->size; i++ )
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{
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if( h->arr[i].key != 0 )
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{
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func( h->arr[i].key, h->arr[i].data, aux );
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}
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}
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}
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int hash_str_cmp( const void *a, const void *b )
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{
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return strcmp((char *)a,(char *)b) == 0;
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}
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/**
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Helper function for hash_wcs_func
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*/
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static uint rotl5( uint in )
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{
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return (in<<5|in>>27);
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}
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int hash_str_func( const void *data )
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{
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int res = 0x67452301u;
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const char *str = data;
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while( *str )
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res = (18499*rotl5(res)) ^ *str++;
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return res;
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}
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int hash_wcs_func( const void *data )
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{
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int res = 0x67452301u;
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const wchar_t *str = data;
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while( *str )
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res = (18499*rotl5(res)) ^ *str++;
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return res;
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}
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int hash_wcs_cmp( const void *a, const void *b )
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{
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return wcscmp((wchar_t *)a,(wchar_t *)b) == 0;
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}
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void pq_init( priority_queue_t *q,
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int (*compare)(void *e1, void *e2) )
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{
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q->arr=0;
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q->size=0;
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q->count=0;
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q->compare = compare;
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}
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/**
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Check that the priority queue is in a valid state
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*/
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/*
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static void pq_check( priority_queue_t *q, int i )
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{
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int l,r;
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if( q->count <= i )
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return;
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l=i*2+1;
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r=i*2+2;
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if( (q->count > l) && (q->compare(q->arr[i], q->arr[l]) < 0) )
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{
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printf( "ERROR: Place %d less than %d\n", i, l );
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}
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if( (q->count > r) && (q->compare(q->arr[i], q->arr[r]) < 0) )
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{
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printf( "ERROR: Place %d less than %d\n", i, r );
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}
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pq_check( q, l );
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pq_check( q, r );
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}
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*/
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int pq_put( priority_queue_t *q,
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void *e )
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{
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int i;
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if( q->size == q->count )
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{
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void **old_arr = q->arr;
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int old_size = q->size;
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q->size = maxi( 4, 2*q->size );
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q->arr = (void **)realloc( q->arr, sizeof(void*)*q->size );
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if( q->arr == 0 )
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{
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q->arr = old_arr;
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q->size = old_size;
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return 0;
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}
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}
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i = q->count;
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while( (i>0) && (q->compare( q->arr[(i-1)/2], e )<0 ) )
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{
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q->arr[i] = q->arr[(i-1)/2];
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i = (i-1)/2;
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}
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q->arr[i]=e;
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q->count++;
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return 1;
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}
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/**
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Make a valid head
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*/
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static void pq_heapify( priority_queue_t *q, int i )
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{
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int l, r, largest;
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l = 2*(i)+1;
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r = 2*(i)+2;
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if( (l < q->count) && (q->compare(q->arr[l],q->arr[i])>0) )
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{
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largest = l;
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}
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else
|
|
{
|
|
largest = i;
|
|
}
|
|
if( (r < q->count) && (q->compare( q->arr[r],q->arr[largest])>0) )
|
|
{
|
|
largest = r;
|
|
}
|
|
|
|
if( largest != i )
|
|
{
|
|
void *tmp = q->arr[largest];
|
|
q->arr[largest]=q->arr[i];
|
|
q->arr[i]=tmp;
|
|
pq_heapify( q, largest );
|
|
}
|
|
}
|
|
|
|
void *pq_get( priority_queue_t *q )
|
|
{
|
|
void *result = q->arr[0];
|
|
q->arr[0] = q->arr[--q->count];
|
|
pq_heapify( q, 0 );
|
|
|
|
/* pq_check(q, 0 ); */
|
|
/* pq_print( q ); */
|
|
|
|
return result;
|
|
}
|
|
|
|
void *pq_peek( priority_queue_t *q )
|
|
{
|
|
return q->arr[0];
|
|
}
|
|
|
|
int pq_empty( priority_queue_t *q )
|
|
{
|
|
return q->count == 0;
|
|
}
|
|
|
|
int pq_get_count( priority_queue_t *q )
|
|
{
|
|
return q->count;
|
|
}
|
|
|
|
void pq_destroy( priority_queue_t *q )
|
|
{
|
|
free( q->arr );
|
|
}
|
|
|
|
|
|
array_list_t *al_new()
|
|
{
|
|
array_list_t *res = malloc( sizeof( array_list_t ) );
|
|
if( !res )
|
|
die_mem();
|
|
al_init( res );
|
|
return res;
|
|
}
|
|
|
|
|
|
void al_init( array_list_t *l )
|
|
{
|
|
memset( l, 0, sizeof( array_list_t ) );
|
|
}
|
|
|
|
void al_destroy( array_list_t *l )
|
|
{
|
|
free( l->arr );
|
|
}
|
|
|
|
int al_push( array_list_t *l, const void *o )
|
|
{
|
|
if( l->pos >= l->size )
|
|
{
|
|
int new_size = l->pos == 0 ? MIN_SIZE : 2 * l->pos;
|
|
void *tmp = realloc( l->arr, sizeof( void *)*new_size );
|
|
if( tmp == 0 )
|
|
return 0;
|
|
l->arr = tmp;
|
|
l->size = new_size;
|
|
}
|
|
l->arr[l->pos++] = o;
|
|
return 1;
|
|
}
|
|
|
|
int al_push_all( array_list_t *a, array_list_t *b )
|
|
{
|
|
int k;
|
|
for( k=0; k<al_get_count( b ); k++ )
|
|
{
|
|
if( !al_push( a, al_get( b, k ) ) )
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
|
|
int al_set( array_list_t *l, int pos, const void *o )
|
|
{
|
|
int old_pos;
|
|
|
|
if( pos < 0 )
|
|
return 0;
|
|
if( pos < l->pos )
|
|
{
|
|
l->arr[pos] = o;
|
|
return 1;
|
|
}
|
|
old_pos=l->pos;
|
|
|
|
l->pos = pos;
|
|
if( al_push( l, o ) )
|
|
{
|
|
/* fwprintf( stderr, L"Clearing from index %d to index %d\n",
|
|
old_pos, pos );
|
|
*/
|
|
memset( &l->arr[old_pos],
|
|
0,
|
|
sizeof(void *) * (pos - old_pos) );
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
const void *al_get( array_list_t *l, int pos )
|
|
{
|
|
if( pos < 0 )
|
|
return 0;
|
|
if( pos >= l->pos )
|
|
return 0;
|
|
return l->arr[pos];
|
|
}
|
|
|
|
void al_truncate( array_list_t *l, int new_sz )
|
|
{
|
|
l->pos = new_sz;
|
|
}
|
|
|
|
const void *al_pop( array_list_t *l )
|
|
{
|
|
const void *e = l->arr[--l->pos];
|
|
if( (l->pos*3 < l->size) && (l->size < MIN_SIZE) )
|
|
{
|
|
const void ** old_arr = l->arr;
|
|
int old_size = l->size;
|
|
l->size = l->size/2;
|
|
l->arr = realloc( l->arr, sizeof(void*)*l->size );
|
|
if( l->arr == 0 )
|
|
{
|
|
l->arr = old_arr;
|
|
l->size = old_size;
|
|
}
|
|
}
|
|
return e;
|
|
}
|
|
|
|
const void *al_peek( array_list_t *l )
|
|
{
|
|
|
|
return l->pos>0?l->arr[l->pos-1]:0;
|
|
}
|
|
|
|
int al_empty( array_list_t *l )
|
|
{
|
|
return l->pos == 0;
|
|
}
|
|
|
|
int al_get_count( array_list_t *l )
|
|
|
|
{
|
|
return l->pos;
|
|
}
|
|
|
|
void al_foreach( array_list_t *l, void (*func)( const void * ))
|
|
{
|
|
int i;
|
|
for( i=0; i<l->pos; i++ )
|
|
func( l->arr[i] );
|
|
}
|
|
|
|
void al_foreach2( array_list_t *l, void (*func)( const void *, void *), void *aux)
|
|
{
|
|
int i;
|
|
for( i=0; i<l->pos; i++ )
|
|
func( l->arr[i], aux );
|
|
}
|
|
|
|
int wcsfilecmp( const wchar_t *a, const wchar_t *b )
|
|
{
|
|
if( *a==0 )
|
|
{
|
|
if( *b==0)
|
|
return 0;
|
|
return -1;
|
|
}
|
|
if( *b==0 )
|
|
{
|
|
return 1;
|
|
}
|
|
int secondary_diff=0;
|
|
if( iswdigit( *a ) && iswdigit( *b ) )
|
|
{
|
|
wchar_t *aend, *bend;
|
|
long al = wcstol( a, &aend, 10 );
|
|
long bl = wcstol( b, &bend, 10 );
|
|
int diff = al - bl;
|
|
if( diff )
|
|
return diff>0?2:-2;
|
|
|
|
secondary_diff = (aend-a) - (bend-b);
|
|
|
|
a=aend-1;
|
|
b=bend-1;
|
|
}
|
|
else
|
|
{
|
|
int diff = towlower(*a) - towlower(*b);
|
|
if( diff != 0 )
|
|
return (diff>0)?2:-2;
|
|
|
|
secondary_diff = *a-*b;
|
|
}
|
|
|
|
int res = wcsfilecmp( a+1, b+1 );
|
|
switch( abs(res) )
|
|
{
|
|
case 2:
|
|
return res;
|
|
default:
|
|
if( secondary_diff )
|
|
return secondary_diff>0?1:-1;
|
|
}
|
|
return 0;
|
|
|
|
}
|
|
|
|
void sb_init( string_buffer_t * b)
|
|
{
|
|
wchar_t c=0;
|
|
memset( b, 0, sizeof(string_buffer_t) );
|
|
b_append( b, &c, sizeof( wchar_t));
|
|
b->used -= sizeof(wchar_t);
|
|
}
|
|
|
|
string_buffer_t *sb_new()
|
|
{
|
|
string_buffer_t *res = malloc( sizeof( string_buffer_t ) );
|
|
if( !res )
|
|
die_mem();
|
|
sb_init( res );
|
|
return res;
|
|
}
|
|
|
|
|
|
void sb_append( string_buffer_t *b, const wchar_t * s)
|
|
{
|
|
// fwprintf( stderr, L"Append string \'%ls\'\n", s );
|
|
|
|
if( !s )
|
|
return;
|
|
|
|
|
|
b_append( b, s, sizeof(wchar_t)*(wcslen(s)+1) );
|
|
b->used -= sizeof(wchar_t);
|
|
}
|
|
|
|
void sb_append_substring( string_buffer_t *b, const wchar_t *s, size_t l )
|
|
{
|
|
wchar_t tmp=0;
|
|
|
|
if( !s )
|
|
return;
|
|
|
|
b_append( b, s, sizeof(wchar_t)*l );
|
|
b_append( b, &tmp, sizeof(wchar_t) );
|
|
b->used -= sizeof(wchar_t);
|
|
}
|
|
|
|
|
|
void sb_append_char( string_buffer_t *b, wchar_t c )
|
|
{
|
|
wchar_t buff[2]=
|
|
{
|
|
c, 0
|
|
}
|
|
;
|
|
sb_append( b, buff );
|
|
|
|
}
|
|
|
|
void sb_append2( string_buffer_t *b, ... )
|
|
{
|
|
va_list va;
|
|
wchar_t *arg;
|
|
|
|
va_start( va, b );
|
|
while( (arg=va_arg(va, wchar_t *) )!= 0 )
|
|
{
|
|
sb_append( b, arg );
|
|
}
|
|
va_end( va );
|
|
}
|
|
|
|
int sb_printf( string_buffer_t *buffer, const wchar_t *format, ... )
|
|
{
|
|
va_list va;
|
|
int res;
|
|
|
|
va_start( va, format );
|
|
res = sb_vprintf( buffer, format, va );
|
|
va_end( va );
|
|
|
|
return res;
|
|
}
|
|
|
|
int sb_vprintf( string_buffer_t *buffer, const wchar_t *format, va_list va_orig )
|
|
{
|
|
int res;
|
|
|
|
if( !buffer->length )
|
|
{
|
|
buffer->length = MIN_SIZE;
|
|
buffer->buff = malloc( MIN_SIZE );
|
|
if( !buffer->buff )
|
|
die_mem();
|
|
}
|
|
|
|
|
|
while( 1 )
|
|
{
|
|
va_list va;
|
|
va_copy( va, va_orig );
|
|
|
|
res = vswprintf( (wchar_t *)((char *)buffer->buff+buffer->used),
|
|
(buffer->length-buffer->used)/sizeof(wchar_t),
|
|
format,
|
|
va );
|
|
|
|
|
|
va_end( va );
|
|
if( res >= 0 )
|
|
{
|
|
buffer->used+= res*sizeof(wchar_t);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
As far as I know, there is no way to check if a
|
|
vswprintf-call failed because of a badly formated string
|
|
option or because the supplied destination string was to
|
|
small. In GLIBC, errno seems to be set to EINVAL either way.
|
|
|
|
Because of this, sb_printf will on failiure try to
|
|
increase the buffer size until the free space is larger than
|
|
SB_MAX_SIZE, at which point it will conclude that the error
|
|
was probably due to a badly formated string option, and
|
|
return an error.
|
|
*/
|
|
|
|
if( buffer->length - buffer->used > SB_MAX_SIZE )
|
|
break;
|
|
|
|
buffer->buff = realloc( buffer->buff, 2*buffer->length );
|
|
if( !buffer->buff )
|
|
die_mem();
|
|
buffer->length *= 2;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
|
|
|
|
|
|
void sb_destroy( string_buffer_t * b )
|
|
{
|
|
free( b->buff );
|
|
}
|
|
|
|
void sb_clear( string_buffer_t * b )
|
|
{
|
|
free( b->buff );
|
|
sb_init( b );
|
|
}
|
|
|
|
|
|
void b_init( buffer_t *b)
|
|
{
|
|
memset( b,0,sizeof(buffer_t));
|
|
}
|
|
|
|
|
|
|
|
void b_destroy( buffer_t *b )
|
|
{
|
|
free( b->buff );
|
|
}
|
|
|
|
|
|
void b_append( buffer_t *b, const void *d, ssize_t len )
|
|
{
|
|
if( len<=0 )
|
|
return;
|
|
|
|
if( !b )
|
|
{
|
|
debug( 2, L"Copy to null buffer" );
|
|
return;
|
|
}
|
|
|
|
if( !d )
|
|
{
|
|
debug( 2, L"Copy from null pointer" );
|
|
return;
|
|
}
|
|
|
|
if( len < 0 )
|
|
{
|
|
debug( 2, L"Negative number of characters to be copied" );
|
|
return;
|
|
}
|
|
|
|
|
|
if( b->length <= (b->used + len) )
|
|
{
|
|
size_t l = maxi( b->length*2,
|
|
maxi( b->used+len+MIN_SIZE,MIN_SIZE));
|
|
|
|
void *d = realloc( b->buff, l );
|
|
if( !d )
|
|
{
|
|
die_mem();
|
|
|
|
}
|
|
b->buff=d;
|
|
b->length = l;
|
|
}
|
|
memcpy( ((char*)b->buff)+b->used,
|
|
d,
|
|
len );
|
|
|
|
// fwprintf( stderr, L"Copy %s, new value %s\n", d, b->buff );
|
|
b->used+=len;
|
|
}
|
|
|
|
long long get_time()
|
|
{
|
|
struct timeval time_struct;
|
|
gettimeofday( &time_struct, 0 );
|
|
return 1000000ll*time_struct.tv_sec+time_struct.tv_usec;
|
|
}
|
|
|