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(ef_nameof, ef_ensure_space): Oops on bad argument.

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(ef_check): Use CANT_HAPPEN().
This commit is contained in:
Markus Armbruster 2005-10-24 23:27:18 +00:00
parent 12b1427693
commit 889dfebaad
1 changed files with 39 additions and 17 deletions
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56
src/lib/common/file.c
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@ -25,11 +25,12 @@
*
* ---
*
* 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>
@ -50,9 +51,8 @@
static int fillcache(struct empfile *, int);
static int do_write(struct empfile *, void *, int, int);
/*
* Open the binary file for table TYPE (EF_SECTOR, ...).
* Open the file-backed table TYPE (EF_SECTOR, ...).
* HOW are EFF_OPEN flags to control operation.
* Return non-zero on success, zero on failure.
* You must call ef_close() before the next ef_open().
@ -67,6 +67,8 @@ ef_open(int type, int how)
return 0;
if (CANT_HAPPEN(how & ~EFF_OPEN))
how &= EFF_OPEN;
/* open file */
ep = &empfile[type];
if (CANT_HAPPEN(ep->fd >= 0))
return 0;
@ -82,6 +84,8 @@ ef_open(int type, int how)
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)",
@ -109,6 +113,8 @@ ef_open(int type, int how)
ep->cids = 0;
ep->flags = (ep->flags & ~EFF_OPEN) | (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 */
@ -117,12 +123,13 @@ ef_open(int type, int how)
return 0;
}
}
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)
@ -144,7 +151,8 @@ ef_close(int type)
}
/*
* 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)
@ -169,7 +177,9 @@ 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)
@ -187,8 +197,9 @@ ef_ptr(int type, int 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)
@ -304,8 +315,12 @@ do_write(struct empfile *ep, void *buf, int id, int count)
}
/*
* 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)
@ -337,7 +352,8 @@ ef_write(int type, int id, void *from)
}
/*
* Grow the file containing objects of the type 'type' by 'count' objects.
* Extend the file-backed table TYPE by COUNT elements.
* Return the ID of the first new element, or -1 on failure.
*/
int
ef_extend(int type, int count)
@ -425,24 +441,30 @@ ef_byname(char *name)
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;
while (id >= empfile[type].fids) {
if (!ef_extend(type, count))
return 0;