/***************************************************************************
 sys_strings.c Copyright (C) 2002 Christoph Reichenbach


 This program may be modified and copied freely according to the terms of
 the GNU general public license (GPL), as long as the above copyright
 notice and the licensing information contained herein are preserved.

 Please refer to www.gnu.org for licensing details.

 This work is provided AS IS, without warranty of any kind, expressed or
 implied, including but not limited to the warranties of merchantibility,
 noninfringement, and fitness for a specific purpose. The author will not
 be held liable for any damage caused by this work or derivatives of it.

 By using this source code, you agree to the licensing terms as stated
 above.


 Please contact the maintainer for bug reports or inquiries.

 Current Maintainer:

    Christoph Reichenbach (CR) <jameson@linuxgames.com>

***************************************************************************/

#include <sys_strings.h>
#include <stdio.h>
#include <sci_memory.h>

void
sys_string_acquire(sys_strings_t *strings, int index, const char *name, int max_len)
{
	sys_string_t *str = strings->strings + index;

	if (index < 0 || index >= SYS_STRINGS_MAX) {
		fprintf(stderr, "[SYSSTR] Error: Attempt to acquire string #%d\n",
			index);
		BREAKPOINT();
	}

	if (str->name
	    && (strcmp(name, str->name)
		|| (str->max_size != max_len))) {
		fprintf(stderr, "[SYSSTR] Error: Attempt to re-acquire existing string #%d;"
			"was '%s', tried to claim as '%s'\n",
			index, str->name, name);
		BREAKPOINT();
	}

	str->name = strdup(name);
	str->max_size = max_len;
	str->value = (char*)sci_malloc(max_len + 1);
	str->value[0] = 0; /* Set to empty string */
}

int
sys_string_set(sys_strings_t *strings, int index, const char *value)
{
	sys_string_t *str = strings->strings + index;

	if (index < 0 || index >= SYS_STRINGS_MAX || !str->name) {
		fprintf(stderr, "[SYSSTR] Error: Attempt to write to invalid/unused string #%d\n",
			index);
		BREAKPOINT();
		return 1;
	}

	strncpy(str->value, value, str->max_size);
	str->value[str->max_size] = 0; /* Make sure to terminate */
	return 0;
}

void
sys_string_free(sys_strings_t *strings, int index)
{
	sys_string_t *str = strings->strings + index;
	
	free(str->name);
	str->name = NULL;

	free(str->value);
	str->value = NULL;
	
	str->max_size = 0;
}

void
sys_string_free_all(sys_strings_t *strings)
{
	int i;

	for (i=0;i<SYS_STRINGS_MAX;i++)
	{
		if (strings->strings[i].name)
			sys_string_free(strings, i);
	}

}

void
sys_strings_restore(sys_strings_t *new_strings, sys_strings_t *old_strings)
{
	int i;

	/* First, pad memory */
	for (i = 0; i < SYS_STRINGS_MAX; i++) {
		sys_string_t *s = new_strings->strings + i;
		char *data = s->value;
		if (data) {
			s->value = (char *)sci_malloc(s->max_size + 1);
			strcpy(s->value, data);
			sci_free(data);
		}
	}

	sys_string_set(new_strings, SYS_STRING_SAVEDIR, old_strings->strings[SYS_STRING_SAVEDIR].value);
}