newstr.c

非常好用的可移植的多平台C/C++源代码编辑器

/* *** This file was borrowed from jam 2.5. The copyright statement from
 * *** jam.c appears below.
 */
/*
 * /+\
 * +\	Copyright 1993-2002 Christopher Seiwald and Perforce Software, Inc.
 * \+/
 *
 * This file is part of jam.
 *
 * License is hereby granted to use this software and distribute it
 * freely, as long as this copyright notice is retained and modifications 
 * are clearly marked.
 *
 * ALL WARRANTIES ARE HEREBY DISCLAIMED.
 */

/*
 * Copyright 1993, 1995 Christopher Seiwald.
 *
 * This file is part of Jam - see jam.c for Copyright information.
 */

/*
 * newstr.c - string manipulation routines
 *
 * To minimize string copying, string creation, copying, and freeing
 * is done through newstr.
 *
 * External functions:
 *
 *    newstr() - return a malloc'ed copy of a string
 *    copystr() - return a copy of a string previously returned by newstr()
 *    freestr() - free a string returned by newstr() or copystr()
 *    donestr() - free string tables
 *
 * Once a string is passed to newstr(), the returned string is readonly.
 *
 * This implementation builds a hash table of all strings, so that multiple 
 * calls of newstr() on the same string allocate memory for the string once.
 * Strings are never actually freed.
 *
 * 11/04/02 (seiwald) - const-ing for string literals
 */

# include "jam.h"
# include "newstr.h"
# include "hash.h"

#if 1 /* TNB */
#include "alloc.h"
static ALLOC *stralloc = 0;
#endif

typedef const char *STRING;

static struct hash *strhash = 0;
static int strtotal = 0;

/*
 * newstr() - return a malloc'ed copy of a string
 */

const char *
newstr( const char *string )
{
	STRING str, *s = &str;

	if( !strhash )
	    strhash = hashinit( sizeof( STRING ), "strings" );

	*s = string;

	if( hashenter( strhash, (HASHDATA **)&s ) )
	{
	    int l = strlen( string );
#if 1
		if (!stralloc)
			stralloc = alloc2_init(4096);
		char *m = alloc2_enter(stralloc, l + 1);
#else
	    char *m = (char *)malloc( l + 1 );
#endif
	    if (DEBUG_MEM)
		    printf("newstr: allocating %d bytes\n", l + 1 );

	    strtotal += l + 1;
	    memcpy( m, string, l + 1 );
	    *s = m;
	}

	return *s;
}

/*
 * copystr() - return a copy of a string previously returned by newstr()
 */

const char *
copystr( const char *s )
{
	return s;
}

/*
 * freestr() - free a string returned by newstr() or copystr()
 */

void
freestr( const char *s )
{
}

/*
 * donestr() - free string tables
 */

void
donestr()
{
	hashdone( strhash );
	strhash = 0; /* TNB */
	strtotal = 0; /* TNB */
	alloc_free(stralloc); /* TNB */
	stralloc = 0; /* TNB */
	if( DEBUG_MEM )
	    printf( "%dK in strings\n", strtotal / 1024 );
}