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/*
F I L E F O U N . C
With the MS-DOS implementation the received attribute is compared
to the request:
O_FILE: accepts only A_NORMAL, A_ARCH/A_READ with A_NORMAL accepted
O_DIR: accepts only A_SUBDIR
O_SUBDIR: accepts only A_SUBDIR, but not the . and ..
O_ALL: accepts all
Not yet supported: O_VOLID: accepts A_VOLID
*/
#include "icrssdef.h"
char *filefound()
{
register unsigned
request,
received;
received = ifs.find.attrib; /* use fast registers */
request = ifs.attrib;
/* First part: see if request */
/* matches attribute of entry */
if /* (list all accepted variants) */
(
! /* if not: */
(
(
(request & O_FILE) /* FILE requested, and */
&& /* an attribute received */
! /* indicating that it's no file */
(
received &
(A_SUBDIR | A_HIDDEN | A_SYSTEM | A_VOLID)
)
)
||
(
(request & (O_SUBDIR | O_DIR)) /* OR: any subdir requested */
&& /* and A_SUBDIR received */
(received & A_SUBDIR)
)
||
(
(request & O_ALL) /* OR: ALL requested */
&& /* and not volume label received */
!(received & A_VOLID)
)
)
)
return (NULL); /* then reject the entry */
/* Second part: O_SUBDIR (overruled by O_ALL / O_DIR) */
/* entries '.' and '..' are rejected */
if
(
!(request & (O_DIR | O_ALL)) /* not O_DIR / O_ALL requested, */
&& /* AND */
(request & O_SUBDIR) /* clean subdir requested */
&& /* AND */
(
!strcmp(ifs.find.name, ".") /* . or .. found */
||
!strcmp(ifs.find.name, "..")
)
)
return (NULL); /* then reject the entry */
return (ifs.find.name); /* return found name */
}
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