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38d65df90c
Unchecked strcpy/strcat can result in memory smashes if provided with overly long source arguments. Replacing these with the strl... functions protects against overruns of the destination memory. Requires changing the signature of various functions to pass destination storage size when destination argument is a pointer rather than something amenable to sizeof() operator.
71 lines
2.7 KiB
C
71 lines
2.7 KiB
C
#ifndef DIRDEFS_H
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#define DIRDEFS_H 1
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#include <sys/types.h> // for u_short, ino_t
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#include "lispemul.h" // for LispPTR
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#include "locfile.h" // for MAXNAMLEN
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/*
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* FINFO and FPROP are used to store the information of the enumerated files
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* and directories. They are arranged in a form of linked list. Each list is
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* corresponding to the each directory enumeration. All of the informations
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* Lisp needs are stored in the list. This list is in the emulator's address space
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* and can be specified by "ID" which is the interface between the emulator and Lisp
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* code. In this implementation, ID is represented as an integer and is actually
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* an index of the array of the lists.
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*
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* To avoid the overhead of the FINFO and FPROP structure dynamic allocation and
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* deallocation, some number of their instances are pre-allocated when the emulator
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* starts and managed in a free list. If all of the pre-allocated instances are in
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* use, new instances are allocated. The new instances are linked to the free list
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* when it is freed.
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*
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* As described above, the linked list result of the enumeration is stored in a
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* array for the subsequent request from Lisp. Lisp code requests the emulator to
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* release the list when it enumerated all of the entries in the list or the
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* enumerating operation is aborted.
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*/
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typedef struct fprop {
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unsigned length; /* Byte length of this file. */
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unsigned wdate; /* Written (Creation) date in Lisp sense. */
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unsigned rdate; /* Read date in Lisp sense. */
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unsigned protect; /* Protect mode of this file. */
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size_t au_len; /* Byte length of author. */
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char author[256]; /* Author in Lisp sense. */
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} FPROP;
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/* This structure has a pointer at each end to force alignment to
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be correct when a pointer is 8 bytes long. */
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typedef struct finfo {
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FPROP *prop; /* File properties Lisp needs. */
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char lname[MAXNAMLEN + 1]; /* Name in Lisp Format. */
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char no_ver_name[MAXNAMLEN + 1];
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/*
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* Name in UNIX Format. Does not
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* include Version field.
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* All lower case.
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*/
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size_t lname_len; /* Byte length of lname. */
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unsigned dirp; /* If 1, this file is a directory. */
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unsigned version; /* Version in Lisp sense. */
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ino_t ino; /* I-node number of this file. */
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struct finfo *next; /* Last entry is indicated by NULL pointer. */
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} FINFO;
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typedef struct dfinfo {
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FINFO *head; /* Head of the linked FINFO structures. */
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FINFO *next; /* FINFO structure generated next time. */
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} DFINFO;
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#ifdef DOS
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int make_old_version(char *old, size_t oldsize, char *file);
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#endif
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#ifdef FSDEBUG
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void print_finfo(FINFO *fp);
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#endif
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int init_finfo(void);
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LispPTR COM_gen_files(LispPTR *args);
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LispPTR COM_next_file(LispPTR *args);
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LispPTR COM_finish_finfo(LispPTR *args);
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#endif
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