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Fix spy to reliably avoid spying same sector more than once

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spy() stored coordinates of sectors successfully spied in an array.
Since it didn't bother to normalize coordinates, it could spy sectors
near the "seams" of the world more than once.  The array was also
wastefully large.

Fix by using a sector bitmap instead, like do_look().
This commit is contained in:
Markus Armbruster 2008-08-23 15:17:44 -04:00
parent e9c7491449
commit dda0a4c82f
1 changed files with 12 additions and 46 deletions
Download patch file Download diff file Expand all files Collapse all files

58
src/lib/commands/spy.c
View file

@ -48,8 +48,6 @@
* format: spy <SECTS>
*/
static int check(coord *table, int *len, coord x, coord y);
static void insert(coord *table, int *len, coord x, coord y);
static void spy_report(struct sctstr *sp);
static void prplanes(int, int);
static void prunits(int, int);
@ -65,8 +63,7 @@ spy(void)
int military;
int btucost;
int i;
coord *table; /* sectors already seen */
int t_len = 0;
unsigned char *bitmap;
int nrecon;
struct nstr_sect nstr;
struct nstr_item ni;
@ -89,12 +86,13 @@ spy(void)
pr("You don't have the BTU's for spying on that scale!\n");
return RET_FAIL;
}
/*
* set up all the goodies we need later
* 6 = neighbors, 2 = x,y
*/
table = malloc((nsects + 1) * 6 * 2 * sizeof(coord));
memset(table, 0, (nsects + 1) * 6 * 2 * sizeof(coord));
bitmap = calloc(WORLD_SZ() / 8, 1);
if (!bitmap) {
logerror("malloc failed in do_look\n");
pr("Memory error. Tell the deity.\n");
return RET_FAIL;
}
pr("SPY report\n");
prdate();
pr(" old sct rd rl def\n");
@ -124,14 +122,8 @@ spy(void)
break;
nx = x + diroff[i][0];
ny = y + diroff[i][1];
/*
* if we've already seen the
* sector, don't bother checking it
* out.
*/
if (check(table, &t_len, nx, ny)) {
continue;
}
if (emp_getbit(nx, ny, bitmap))
continue; /* spied already */
getsect(nx, ny, &dsect);
if (player->owner || dsect.sct_type == SCT_WATER)
continue;
@ -166,7 +158,7 @@ spy(void)
}
/* spy report */
insert(table, &t_len, nx, ny);
emp_setbit(nx, ny, bitmap);
spy_report(&dsect);
changed += map_set(player->cnum, dsect.sct_x, dsect.sct_y,
dchr[dsect.sct_type].d_mnem, 0);
@ -182,7 +174,7 @@ spy(void)
if (changed)
writemap(player->cnum);
player->btused += btucost;
free(table);
free(bitmap);
return RET_OK;
}
@ -210,32 +202,6 @@ spy_report(struct sctstr *sp)
prplanes(sp->sct_x, sp->sct_y);
}
/*
* insert a key into the table.
*/
static void
insert(coord *table, int *len, coord x, coord y)
{
if (!check(table, len, x, y)) {
table[(*len)++] = x;
table[(*len)++] = y;
}
}
/*
* see if a key is in the bitmask table
*/
static int
check(coord *table, int *len, coord x, coord y)
{
int i;
for (i = 0; i < *len; i += 2)
if (table[i] == x && table[i + 1] == y)
return 1;
return 0;
}
static void
prunits(int x, int y)
{