*
* ---
*
- * file.c: Misc. operations on files
+ * file.c: Operations on Empire tables (`files' for historical reasons)
*
* Known contributors to this file:
* Dave Pare, 1989
* Steve McClure, 2000
+ * Markus Armbruster, 2005
*/
#include <errno.h>
#if !defined(_WIN32)
#include <unistd.h>
#endif
-#include "misc.h"
-#include "nsc.h"
-#include "file.h"
#include "common.h"
+#include "file.h"
#include "gen.h"
-
+#include "match.h"
+#include "misc.h"
+#include "nsc.h"
+#include "optlist.h"
static int fillcache(struct empfile *, int);
static int do_write(struct empfile *, void *, int, int);
-
/*
- * Open the binary file for table TYPE (EF_SECTOR, ...).
- * HOW are EFF_OPEN flags to control operation.
+ * Open the file-backed table TYPE (EF_SECTOR, ...).
+ * HOW are flags to control operation. Naturally, immutable flags are
+ * not permitted.
* Return non-zero on success, zero on failure.
* You must call ef_close() before the next ef_open().
*/
if (ef_check(type) < 0)
return 0;
- if (CANT_HAPPEN(how & ~EFF_OPEN))
- how &= EFF_OPEN;
+ if (CANT_HAPPEN(how & EFF_IMMUTABLE))
+ how &= ~EFF_IMMUTABLE;
+
+ /* open file */
ep = &empfile[type];
if (CANT_HAPPEN(ep->fd >= 0))
return 0;
logerror("Can't open %s (%s)", ep->file, strerror(errno));
return 0;
}
+
+ /* get file size */
fsiz = fsize(fd);
if (fsiz % ep->size) {
logerror("Can't open %s (file size not a multiple of record size %d)",
return 0;
}
ep->fids = fsiz / ep->size;
- if (how & EFF_MEM)
- ep->csize = ep->fids;
- else
- ep->csize = max(1, blksize(fd) / ep->size);
- size = ep->csize * ep->size;
- if (size) {
+
+ /* allocate cache */
+ if (ep->flags & EFF_STATIC) {
+ /* ep->cache already points to space for e->csize elements */
+ if (how & EFF_MEM) {
+ if (ep->fids > ep->csize) {
+ logerror("Can't open %s: file larger than %d bytes",
+ ep->file, ep->fids * ep->size);
+ close(fd);
+ return 0;
+ }
+ }
+ } else {
+ if (how & EFF_MEM)
+ ep->csize = ep->fids;
+ else
+ ep->csize = max(1, blksize(fd) / ep->size);
+ size = ep->csize * ep->size;
+ if (CANT_HAPPEN(ep->cache))
+ free(ep->cache);
ep->cache = malloc(size);
- if (ep->cache == NULL) {
+ if (ep->cache == NULL && size) {
logerror("Can't open %s: out of memory", ep->file);
close(fd);
return 0;
}
- } else {
- ep->cache = NULL;
}
ep->baseid = 0;
ep->cids = 0;
- ep->flags = (ep->flags & ~EFF_OPEN) | (how & ~EFF_CREATE);
+ ep->flags = (ep->flags & EFF_IMMUTABLE) | (how & ~EFF_CREATE);
ep->fd = fd;
+
+ /* map file into cache */
if ((how & EFF_MEM) && ep->fids) {
if (fillcache(ep, 0) != ep->fids) {
ep->cids = 0; /* prevent cache flush */
- ep->flags &= ~EFF_OPEN; /* maintain invariant */
+ ep->flags &= EFF_IMMUTABLE; /* maintain invariant */
ef_close(type);
return 0;
}
}
+
+ /*
+ * Could close fd if both EFF_RDONLY and EFF_MEM, but that doesn't
+ * happen, so don't bother.
+ */
+
return 1;
}
/*
- * Close the file containing objects of the type 'type', flushing the cache
- * if applicable.
+ * Close the file-backed table TYPE (EF_SECTOR, ...).
+ * Return non-zero on success, zero on failure.
*/
int
ef_close(int type)
retval = ef_flush(type);
ep = &empfile[type];
- ep->flags &= ~EFF_OPEN;
- free(ep->cache);
- ep->cache = NULL;
+ ep->flags &= EFF_IMMUTABLE;
+ if (!(ep->flags & EFF_STATIC)) {
+ free(ep->cache);
+ ep->cache = NULL;
+ }
if (close(ep->fd) < 0) {
logerror("Error closing %s (%s)", ep->name, strerror(errno));
retval = 0;
}
/*
- * Flush the cache of the file containing objects of type 'type' to disk.
+ * Flush file-backed table TYPE (EF_SECTOR, ...) to disk.
+ * Return non-zero on success, zero on failure.
*/
int
ef_flush(int type)
}
/*
- * Return a pointer the id 'id' of object of type 'type' in the cache.
+ * Return pointer to element ID in table TYPE if it exists, else NULL.
+ * The table must be fully cached, i.e. flags & EFF_MEM.
+ * The caller is responsible for flushing changes he makes.
*/
void *
ef_ptr(int type, int id)
if (ef_check(type) < 0)
return NULL;
-
ep = &empfile[type];
- if (CANT_HAPPEN(!(ep->flags & EFF_MEM)))
+ if (CANT_HAPPEN(!(ep->flags & EFF_MEM) || !ep->cache))
+ return NULL;
+ if (id < 0 || id >= ep->fids) {
+ CANT_HAPPEN(id != ep->fids);
return NULL;
- if (id < 0 || id >= ep->fids)
- return NULL; /* FIXME can this happen? */
+ }
return ep->cache + ep->size * id;
}
/*
- * buffered read. Tries to read a large number of items.
- * This system won't work if item size is > sizeof buffer area.
+ * Read element ID from table TYPE into buffer INTO.
+ * FIXME pass buffer size!
+ * Return non-zero on success, zero on failure.
*/
int
ef_read(int type, int id, void *into)
if (ef_check(type) < 0)
return 0;
ep = &empfile[type];
- if (id < 0)
+ if (CANT_HAPPEN(!ep->cache))
+ return 0;
+ if (id < 0 || id >= ep->fids) {
+ CANT_HAPPEN(id != ep->fids);
return 0;
+ }
+
if (ep->flags & EFF_MEM) {
- if (id >= ep->fids)
- return 0;
- from = ep->cache + (id * ep->size);
+ from = ep->cache + id * ep->size;
} else {
- if (id >= ep->fids) {
- ep->fids = fsize(ep->fd) / ep->size;
- if (id >= ep->fids)
- return 0;
- }
- if (ep->baseid + ep->cids <= id || ep->baseid > id)
+ if (ep->baseid + ep->cids <= id || ep->baseid > id) {
if (fillcache(ep, id) < 1)
return 0;
+ }
from = ep->cache + (id - ep->baseid) * ep->size;
}
memcpy(into, from, ep->size);
}
/*
- * buffered write. Modifies read cache (if applicable)
- * and writes through to disk.
+ * Write element ID into file-backed table TYPE from buffer FROM.
+ * FIXME pass buffer size!
+ * Write through cache straight to disk.
+ * Cannot write beyond the end of fully cached table (flags & EFF_MEM).
+ * Can write at the end of partially cached table.
+ * Return non-zero on success, zero on failure.
*/
int
ef_write(int type, int id, void *from)
if (ef_check(type) < 0)
return 0;
ep = &empfile[type];
- if (id > 65536) {
- /* largest unit id; this may bite us in large games */
- logerror("ef_write: type %d id %d is too large!\n", type, id);
- return 0;
- }
if (ep->prewrite)
ep->prewrite(id, from);
if (CANT_HAPPEN((ep->flags & EFF_MEM) ? id >= ep->fids : id > ep->fids))
}
/*
- * Grow the file containing objects of the type 'type' by 'count' objects.
+ * Extend the file-backed table TYPE by COUNT elements.
+ * Return non-zero on success, zero on failure.
*/
int
ef_extend(int type, int count)
/* FIXME lazy bastards... do this right */
/* XXX this will cause problems if there are ef_ptrs (to the
* old allocated structure) active when we do the re-open */
- how = ep->flags & EFF_OPEN;
+ how = ep->flags & ~EFF_IMMUTABLE;
ef_close(type);
ef_open(type, how);
} else {
return i == count;
}
-/*
- * Mark the cache for the file containing objects of type 'type' as unused.
- */
-void
-ef_zapcache(int type)
-{
- struct empfile *ep = &empfile[type];
- if ((ep->flags & EFF_MEM) == 0) {
- ep->cids = 0;
- ep->baseid = -1;
- }
-}
-
struct castr *
ef_cadef(int type)
{
}
/*
- * Search empfile[0..EF_MAX-1] for element named NAME.
- * Return its index in empfile[] if found, else -1.
+ * Search for a table matching NAME, return its table type.
+ * Return M_NOTFOUND if there are no matches, M_NOTUNIQUE if there are
+ * several.
*/
int
ef_byname(char *name)
{
- struct empfile *ef;
- int i;
- int len;
+ return stmtch(name, empfile, offsetof(struct empfile, name),
+ sizeof(empfile[0]));
+}
- len = strlen(name);
- for (i = 0; i < EF_MAX; i++) {
- ef = &empfile[i];
- if (strncmp(ef->name, name, min(len, strlen(ef->name))) == 0)
- return i;
+/*
+ * Search CHOICES[] for a table type matching NAME, return it.
+ * Return M_NOTFOUND if there are no matches, M_NOTUNIQUE if there are
+ * several.
+ * CHOICES[] must be terminated with a negative value.
+ */
+int
+ef_byname_from(char *name, int choices[])
+{
+ int res;
+ int *p;
+
+ res = M_NOTFOUND;
+ for (p = choices; *p >= 0; p++) {
+ if (ef_check(*p) < 0)
+ continue;
+ switch (mineq(name, empfile[*p].name)) {
+ case ME_MISMATCH:
+ break;
+ case ME_PARTIAL:
+ if (res >= 0)
+ return M_NOTUNIQUE;
+ res = *p;
+ break;
+ case ME_EXACT:
+ return *p;
+ }
}
- return -1;
+ return res;
}
char *
ef_nameof(int type)
{
- if (type < 0 || type >= EF_MAX)
- return "bad item type";
+ if (ef_check(type) < 0)
+ return "bad ef_type";
return empfile[type].name;
}
int
ef_check(int type)
{
- if (type < 0 || type >= EF_MAX) {
- logerror("ef_ptr: bad EF_type %d\n", type);
+ if (CANT_HAPPEN((unsigned)type >= EF_MAX))
return -1;
- }
return 0;
}
+/*
+ * Ensure file-backed table contains ID.
+ * If necessary, extend it in steps of COUNT elements.
+ * Return non-zero on success, zero on failure.
+ */
int
ef_ensure_space(int type, int id, int count)
{
+ if (ef_check(type) < 0)
+ return 0;
+ CANT_HAPPEN(id < 0);
+
while (id >= empfile[type].fids) {
if (!ef_extend(type, count))
return 0;
}
return 1;
}
+
+static void
+ef_fix_size(struct empfile *ep, int n)
+{
+ ep->cids = ep->fids = n;
+ ep->csize = n + 1;
+}
+
+static void
+ef_init_chr(int type, size_t size, ptrdiff_t name_offs)
+{
+ struct empfile *ep = &empfile[type];
+ char *p;
+
+ for (p = ep->cache;
+ *((char **)(p + name_offs)) && **((char **)(p + name_offs));
+ p += size) ;
+ ep->cids = ep->fids = (p - ep->cache) / size;
+}
+
+/*
+ * Initialize Empire tables.
+ * Must be called once, before using anything else from this module.
+ */
+void
+ef_init(void)
+{
+ struct castr *ca;
+ struct empfile *ep;
+ struct symbol *lup;
+ int i;
+
+ empfile[EF_MAP].size = empfile[EF_BMAP].size = (WORLD_X * WORLD_Y) / 2;
+
+ ef_init_chr(EF_SHIP_CHR,
+ sizeof(struct mchrstr), offsetof(struct mchrstr, m_name));
+ ef_init_chr(EF_PLANE_CHR,
+ sizeof(struct plchrstr), offsetof(struct plchrstr, pl_name));
+ ef_init_chr(EF_LAND_CHR,
+ sizeof(struct lchrstr), offsetof(struct lchrstr, l_name));
+ ef_init_chr(EF_NUKE_CHR,
+ sizeof(struct nchrstr), offsetof(struct nchrstr, n_name));
+
+ ca = (struct castr *)empfile[EF_META].cache;
+ for (i = 0; ca[i].ca_name; i++) ;
+ ef_fix_size(&empfile[EF_META], i);
+
+ for (ep = empfile; ep->uid >= 0; ep++) {
+ if (ep->cadef == symbol_ca) {
+ lup = (struct symbol *)ep->cache;
+ for (i = 0; lup[i].name; i++) ;
+ ef_fix_size(ep, i);
+ }
+ }
+}
projects / empserver / blobdiff