modify.c

/* ************************************************************************
*  file: modify.c                                         Part of DIKUMUD *
*  Usage: Run-time modification (by users) of game variables              *
*  Copyright (C) 1990, 1991 - see 'license.doc' for complete information. *
************************************************************************ */

#include <signal.h>
#include <stdio.h>
#include <ctype.h>
#include <string.h>
#include <time.h>

#include "structs.h"
#include "utils.h"
#include "interpreter.h"
#include "handler.h"
#include "db.h"
#include "comm.h"

#define REBOOT_AT    10  /* 0-23, time of optional reboot if -e lib/reboot */


#define TP_MOB    0
#define TP_OBJ	   1
#define TP_ERROR  2


void show_string(struct descriptor_data *d, char *input);
void log(char *str);



char *string_fields[] =
{
	"name",
	"short",
	"long",
	"description",
	"title",
	"delete-description",
	"\n"
};




/* maximum length for text field x+1 */
int length[] =
{
	15,
	60,
	256,
	240,
	60
};




char *skill_fields[] =
{
	"learned",
	"recognize",
	"\n"
};



/* ************************************************************************
*  modification of malloc'ed strings                                      *
************************************************************************ */

/* Add user input to the 'current' string (as defined by d->str) */
void string_add(struct descriptor_data *d, char *str)
{
	char *scan;
	int terminator = 0;

	/* determine if this is the terminal string, and truncate if so */
	for (scan = str; *scan; scan++)
	   if (terminator = (*scan == '@'))
	   {
			*scan = '\0';
			break;
	   }

	if (!(*d->str))
	{
		if (strlen(str) > d->max_str)
		{
			send_to_char("String too long - Truncated.\n\r",
			   d->character);
			*(str + d->max_str) = '\0';
			terminator = 1;
		}
		CREATE(*d->str, char, strlen(str) + 3);
		strcpy(*d->str, str);
	}
	else
	{
		if (strlen(str) + strlen(*d->str) > d->max_str)
		{
			send_to_char("String too long. Last line skipped.\n\r",
			   d->character);
			terminator = 1;
		}
		else
		{
			if (!(*d->str = (char *) realloc(*d->str, strlen(*d->str) +
		   	strlen(str) + 3)))
			{
				perror("string_add");
				exit(1);
			}
			strcat(*d->str, str);
		}
	}

	if (terminator)
	{
		d->str = 0;
		if (d->connected == CON_EXDSCR)
		{
			SEND_TO_Q(MENU, d);
			d->connected = CON_SLCT;
		}
	}
	else
	   strcat(*d->str, "\n\r");
}


#undef MAX_STR

/* interpret an argument for do_string */
void quad_arg(char *arg, int *type, char *name, int *field, char *string)
{
	char buf[MAX_STRING_LENGTH];
	int i;

	/* determine type */
	arg = one_argument(arg, buf);
	if (is_abbrev(buf, "char"))
	   *type = TP_MOB;
	else if (is_abbrev(buf, "obj"))
	   *type = TP_OBJ;
	else
	{
		*type = TP_ERROR;
		return;
	}

	/* find name */
	arg = one_argument(arg, name);

	/* field name and number */
	arg = one_argument(arg, buf);
	if (!(*field = old_search_block(buf, 0, strlen(buf), string_fields, 0)))
	   return;

	/* string */
	for (; isspace(*arg); arg++);
	for (; *string = *arg; arg++, string++);

	return;
}




/* modification of malloc'ed strings in chars/objects */
void do_string(struct char_data *ch, char *arg, int cmd)
{
	char name[MAX_STRING_LENGTH], string[MAX_STRING_LENGTH];
	int field, type;
	struct char_data *mob;
	struct obj_data *obj;
	struct extra_descr_data *ed, *tmp;

	if (IS_NPC(ch))
	   return;

	quad_arg(arg, &type, name, &field, string);

	if (type == TP_ERROR)
	{
		send_to_char(
		 "Syntax:\n\rstring ('obj'|'char') <name> <field> [<string>].",
		 ch);
		return;
	}

	if (!field)
	{
		send_to_char("No field by that name. Try 'help string'.\n\r",
		   ch);
		return;
	}

	if (type == TP_MOB)
	{
		/* locate the beast */
		if (!(mob = get_char_vis(ch, name)))
		{
			send_to_char("I don't know anyone by that name...\n\r",
			   ch);
			return;
		}

		switch(field)
		{
			case 1:
				if (!IS_NPC(mob) && GET_LEVEL(ch) < 24)
				{
					send_to_char("You can't change that field for players.", ch);
					return;
				}
				ch->desc->str = &GET_NAME(mob);
				if (!IS_NPC(mob))
					send_to_char(
						"WARNING: You have changed the name of a player.\n\r", ch);
			break;
			case 2:
			   if (!IS_NPC(mob))
			   {
					send_to_char(
				   "That field is for monsters only.\n\r", ch);
			   	return;
			   }
			   ch->desc->str = &mob->player.short_descr;
			break;
			case 3:
			   if (!IS_NPC(mob))
			   {
				send_to_char(
				   "That field is for monsters only.\n\r", ch);
			   	return;
			   }
			   ch->desc->str = &mob->player.long_descr;
			break;
			case 4:ch->desc->str = &mob->player.description; break;
			case 5:
			   if (IS_NPC(mob))
			   {
				send_to_char("Monsters have no titles.\n\r",
				   ch);
				return;
			   }
			   ch->desc->str = &mob->player.title;
			break;
			default:
			   send_to_char(
			      "That field is undefined for monsters.\n\r", ch);
			   return;
			break;
		}
	}
	else    /* type == TP_OBJ */
	{
		/* locate the object */
		if (!(obj = get_obj_vis(ch, name)))
		{
			send_to_char("Can't find such a thing here..\n\r", ch);
			return;
		}

		switch(field)
		{
			case 1: ch->desc->str = &obj->name; break;
			case 2: ch->desc->str = &obj->short_description; break;
			case 3: ch->desc->str = &obj->description; break;
			case 4:
				if (!*string)
				{
					send_to_char("You have to supply a keyword.\n\r", ch);
					return;
				}
				/* try to locate extra description */
				for (ed = obj->ex_description; ; ed = ed->next)
					if (!ed) /* the field was not found. create a new one. */
					{
						CREATE(ed , struct extra_descr_data, 1);
						ed->next = obj->ex_description;
						obj->ex_description = ed;
						CREATE(ed->keyword, char, strlen(string) + 1);
						strcpy(ed->keyword, string);
						ed->description = 0;
						ch->desc->str = &ed->description;
						send_to_char("New field.\n\r", ch);
						break;
					}
					else if (!str_cmp(ed->keyword, string)) /* the field exists */
					{
						free(ed->description);
						ed->description = 0;
						ch->desc->str = &ed->description;
						send_to_char(
							"Modifying description.\n\r", ch);
						break;
					}
				ch->desc->max_str = MAX_STRING_LENGTH;
				return; /* the stndrd (see below) procedure does not apply here */
			break;
			case 6:
				if (!*string)
				{
					send_to_char("You must supply a field name.\n\r", ch);
					return;
				}
				/* try to locate field */
				for (ed = obj->ex_description; ; ed = ed->next)
					if (!ed)
					{
						send_to_char("No field with that keyword.\n\r", ch);
						return;
					}
					else if (!str_cmp(ed->keyword, string))
					{
						free(ed->keyword);
						if (ed->description)
							free(ed->description);

						/* delete the entry in the desr list */
						if (ed == obj->ex_description)
							obj->ex_description = ed->next;
						else
						{
							for(tmp = obj->ex_description; tmp->next != ed;
								tmp = tmp->next);
							tmp->next = ed->next;
						}
						free(ed);

						send_to_char("Field deleted.\n\r", ch);
						return;
					}
			break;
			default:
			   send_to_char(
			      "That field is undefined for objects.\n\r", ch);
			   return;
			break;
		}
	}

	if (*ch->desc->str)
	{
		free(*ch->desc->str);
	}

	if (*string)   /* there was a string in the argument array */
	{
		if (strlen(string) > length[field - 1])
		{
			send_to_char("String too long - truncated.\n\r", ch);
			*(string + length[field - 1]) = '\0';
		}
		CREATE(*ch->desc->str, char, strlen(string) + 1);
		strcpy(*ch->desc->str, string);
		ch->desc->str = 0;
		send_to_char("Ok.\n\r", ch);
	}
	else          /* there was no string. enter string mode */
	{
		send_to_char("Enter string. terminate with '@'.\n\r", ch);
		*ch->desc->str = 0;
		ch->desc->max_str = length[field - 1];
	}
}















/* db stuff *********************************************** */


/* One_Word is like one_argument, execpt that words in quotes "" are */
/* regarded as ONE word                                              */

char *one_word(char *argument, char *first_arg )
{
	int found, begin, look_at;

	found = begin = 0;

	do
	{
		for ( ;isspace(*(argument + begin)); begin++);

		if (*(argument+begin) == '\"') {  /* is it a quote */

			begin++;

			for (look_at=0; (*(argument+begin+look_at) >= ' ') &&
			    (*(argument+begin+look_at) != '\"') ; look_at++)
				*(first_arg + look_at) = LOWER(*(argument + begin + look_at));

			if (*(argument+begin+look_at) == '\"')
				begin++;

		} else {

			for (look_at=0; *(argument+begin+look_at) > ' ' ; look_at++)
				*(first_arg + look_at) = LOWER(*(argument + begin + look_at));

		}

		*(first_arg + look_at) = '\0';
		begin += look_at;
	}
	while (fill_word(first_arg));

	return(argument+begin);
}


struct help_index_element *build_help_index(FILE *fl, int *num)
{
	int nr = -1, issorted, i;
	struct help_index_element *list = 0, mem;
	char buf[81], tmp[81], *scan;
	long pos;

	for (;;)
	{
		pos = ftell(fl);
		fgets(buf, 81, fl);
		*(buf + strlen(buf) - 1) = '\0';
		scan = buf;
		for (;;)
		{
			/* extract the keywords */
			scan = one_word(scan, tmp);

			if (!*tmp)
				break;

			if (!list)
			{
				CREATE(list, struct help_index_element, 1);
				nr = 0;
			}
			else
				RECREATE(list, struct help_index_element, ++nr + 1);

			list[nr].pos = pos;
			CREATE(list[nr].keyword, char, strlen(tmp) + 1);
			strcpy(list[nr].keyword, tmp);
		}
		/* skip the text */
		do
			fgets(buf, 81, fl);
		while (*buf != '#');
		if (*(buf + 1) == '~')
			break;
	}
	/* we might as well sort the stuff */
	do
	{
		issorted = 1;
		for (i = 0; i < nr; i++)
			if (str_cmp(list[i].keyword, list[i + 1].keyword) > 0)
			{
				mem = list[i];
				list[i] = list[i + 1];
				list[i + 1] = mem;
				issorted = 0;
			}
	}
	while (!issorted);

	*num = nr;
	return(list);
}



void page_string(struct descriptor_data *d, char *str, int keep_internal)
{
	if (!d)
		return;

	if (keep_internal)
	{
		CREATE(d->showstr_head, char, strlen(str) + 1);
		strcpy(d->showstr_head, str);
		d->showstr_point = d->showstr_head;
	}
	else
		d->showstr_point = str;

	show_string(d, "");
}



void show_string(struct descriptor_data *d, char *input)
{
	char buffer[MAX_STRING_LENGTH], buf[MAX_INPUT_LENGTH];
	register char *scan, *chk;
	int lines = 0, toggle = 1;

	one_argument(input, buf);

	if (*buf)
	{
		if (d->showstr_head)
		{
			free(d->showstr_head);
			d->showstr_head = 0;
		}
		d->showstr_point = 0;
		return;
	}

	/* show a chunk */
	for (scan = buffer;; scan++, d->showstr_point++)
		if((((*scan = *d->showstr_point) == '\n') || (*scan == '\r')) &&
			((toggle = -toggle) < 0))
			lines++;
		else if (!*scan || (lines >= 22))
		{
			*scan = '\0';
			SEND_TO_Q(buffer, d);

			/* see if this is the end (or near the end) of the string */
			for (chk = d->showstr_point; isspace(*chk); chk++);
			if (!*chk)
			{
				if (d->showstr_head)
				{
					free(d->showstr_head);
					d->showstr_head = 0;
				}
				d->showstr_point = 0;
			}
			return;
		}
}






void night_watchman(void)
{
	long tc;
	struct tm *t_info;

	extern int diku_shutdown;

	void send_to_all(char *messg);

	tc = time(0);
	t_info = localtime(&tc);

	if ((t_info->tm_hour == 8) && (t_info->tm_wday > 0) &&
		(t_info->tm_wday < 6))
		if (t_info->tm_min > 50)
		{
			log("Leaving the scene for the serious folks.");
			send_to_all("Closing down. Thank you for flying DikuMUD.\n\r");
			diku_shutdown = 1;
		}
		else if (t_info->tm_min > 40)
			send_to_all("ATTENTION: DikuMUD will shut down in 10 minutes.\n\r");
		else if (t_info->tm_min > 30)
			send_to_all("Warning: The game will close in 20 minutes.\n\r");
}


void check_reboot(void)
{
	long tc;
	struct tm *t_info;
	char dummy;
	FILE *boot;

	extern int diku_shutdown, reboot;

	tc = time(0);
	t_info = localtime(&tc);

	if ((t_info->tm_hour + 1) == REBOOT_AT && t_info->tm_min > 30)
		if (boot = fopen("./reboot", "r"))
		{
			if (t_info->tm_min > 50)
			{
				log("Reboot exists.");
				fread(&dummy, sizeof(dummy), 1, boot);
				if (!feof(boot))   /* the file is nonepty */
				{
					log("Reboot is nonempty.");

#if __linux__
					/* the script can't handle the signals */
					sigsetmask(sigprocmask(SIGUSR1) | sigprocmask(SIGUSR2) |
					sigprocmask(SIGINT) |	sigprocmask(SIGPIPE) | sigprocmask(SIGALRM) |
					sigprocmask(SIGTERM) | sigprocmask(SIGURG) | sigprocmask(SIGXCPU) |
					sigprocmask(SIGHUP) |	sigprocmask(SIGVTALRM));
#else
					sigsetmask(sigmask(SIGUSR1) | sigmask(SIGUSR2) |
					sigmask(SIGINT) |	sigmask(SIGPIPE) | sigmask(SIGALRM) |
					sigmask(SIGTERM) | sigmask(SIGURG) | sigmask(SIGXCPU) |
					sigmask(SIGHUP) |	sigmask(SIGVTALRM));
#endif

					if (system("./reboot"))
					{
						log("Reboot script terminated abnormally");
						send_to_all("The reboot was cancelled.\n\r");
						system("mv ./reboot reboot.FAILED");
						fclose(boot);
						sigsetmask(0);
						return;
					}
					else
						system("mv ./reboot reboot.SUCCEEDED");
					sigsetmask(0);
				}

				send_to_all("Automatic reboot. Come back in a little while.\n\r");
				diku_shutdown = reboot = 1;
			}
			else if (t_info->tm_min > 40)
				send_to_all("ATTENTION: DikuMUD will reboot in 10 minutes.\n\r");
			else if (t_info->tm_min > 30)
				send_to_all(
					"Warning: The game will close and reboot in 20 minutes.\n\r");

			fclose(boot);
		}
}


#define GR
#define NEW
#ifdef GR




int workhours()
{
	long tc;
	struct tm *t_info;

	tc = time(0);
	t_info = localtime(&tc);

	return((t_info->tm_wday > 0) && (t_info->tm_wday < 6) && (t_info->tm_hour >= 9)
		&& (t_info->tm_hour < 17));
}






/*
* This procedure is *heavily* system dependent. If your system is not set up
* properly for this particular way of reading the system load (It's weird all
* right - but I couldn't think of anything better), change it, or don't use -l.
* It shouldn't be necessary to use -l anyhow. It's oppressive and unchristian
* to harness man's desire to play. Who needs a friggin' degree, anyhow?
*/

int load(void)
{
	struct syslinfo {
		char	sl_date[12];	/* "Tue Sep 16\0" */
		char	sl_time[8];	/* "11:10\0" */
		char	sl_load1[6];	/* "12.0\0" */
		char	sl_load2[10];	/* "+2.3 14u\0" */
	} info;
	FILE *fl;
	int ld, i, sum;
	static int previous[5];
	static int p_point = -1;
	extern int slow_death;

	if (!(fl = fopen("/tmp/.sysline", "r")))
	{
		perror("sysline. (dying)");
		slow_death = 1;
		return(-1);
	}
	if (!fread(&info, sizeof(info), 1, fl))
	{
		perror("fread sysline (dying)");
		slow_death = 1;
		return(-1);
	}
	fclose(fl);

	if (p_point < 0)
	{
		previous[0] = atoi(info.sl_load1);
		for (i = 1; i< 5; i++)
			previous[i] = previous[0];
		p_point = 1;
		return(previous[0]);
	}
	else
	{
		/* put new figure in table */
		previous[p_point] = atoi(info.sl_load1);
		if (++p_point > 4)
			p_point = 0;

		for (i = 0, sum = 0; i < 5; i++)
			sum += previous[i];
		return((int) sum / 5);
	}
}




char *nogames(void)
{
	static char text[200];
	FILE *fl;

	if (fl = fopen("lib/nogames", "r"))
	{
		log("/usr/games/nogames exists");
		fgets(text, 200, fl);
		return(text);
		fclose(fl);
	}
	else
		return(0);
}


#ifdef OLD_COMA

void coma(void)
{
	extern struct descriptor_data *descriptor_list;
	extern int tics;

	void close_socket(struct descriptor_data *d);

	log("Entering comatose state");

	while (descriptor_list)
		close_socket(descriptor_list);

	do
	{
		sleep(300);
		tics = 1;
		if (workhours())
		{
			log("Working hours collision during coma. Exit.");
			exit(0);
		}
	}
	while (load() >= 6);

	log("Leaving coma");
}

#endif



/* emulate the game regulator */
void gr(int s)
{
	char *txt = 0, buf[1024];
	int ld = 0;
	static char *warnings[3] =
	{
		"If things don't look better within 3 minutes, the game will pause.\n\r",
		"The game will close temporarily 2 minutes from now.\n\r",
		"WARNING: The game will close in 1 minute.\n\r"
 	};
	static int wnr = 0;

	extern int slow_death, diku_shutdown;

	void send_to_all(char *messg);

	void coma(int s);

	if (((ld = load()) >= 6) || (txt = nogames()) || slow_death)
	{
		if (ld >= 6)
		{
			sprintf(buf, "The system load is greater than 6.0 (%d)\n\r", ld);
			send_to_all(buf);
		}
		else if (slow_death)
			send_to_all("The game is dying.\n\r");
		else
		{
			strcpy(buf,
				"Game playing is no longer permitted on this machine:\n\r");
			strcat(buf, txt);
			strcat(buf, "\n\r");
			send_to_all(buf);
		}

		if (wnr < 3)
			send_to_all(warnings[wnr++]);
		else
			if (ld >= 6)
			{
				coma(s);
				wnr = 0;
			}
			else
				diku_shutdown = 1;
	}
	else if (workhours())
		diku_shutdown = 1;				/* this shouldn't happen */
	else if (wnr)
	{
		send_to_all("Things look brighter now - you can continue playing.\n\r");
		wnr = 0;
	}
}



#endif