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Amiga Games Extra 1996 June
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msd_dir.c
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C/C++ Source or Header
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1995-09-16
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5KB
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230 lines
/*
* @(#)msd_dir.c 1.4 87/11/06 Public Domain.
*
* A public domain implementation of BSD directory routines for
* MS-DOS. Written by Michael Rendell ({uunet,utai}michael@garfield),
* August 1897
*/
#include <sys/types.h>
#include <sys/stat.h>
#include "msd_dir.h"
#ifndef __TURBOC__
#include <malloc.h>
#else
#include <stdlib.h>
#endif
#include <string.h>
#include <dos.h>
#ifndef NULL
# define NULL 0
#endif /* NULL */
#ifndef MAXPATHLEN
# define MAXPATHLEN 255
#endif /* MAXPATHLEN */
/* attribute stuff */
#define A_RONLY 0x01
#define A_HIDDEN 0x02
#define A_SYSTEM 0x04
#define A_LABEL 0x08
#define A_DIR 0x10
#define A_ARCHIVE 0x20
/* dos call values */
#define DOSI_FINDF 0x4e
#define DOSI_FINDN 0x4f
#define DOSI_SDTA 0x1a
#define Newisnull(a, t) ((a = (t *) malloc(sizeof(t))) == (t *) NULL)
/* #define ATTRIBUTES (A_DIR | A_HIDDEN | A_SYSTEM) */
#define ATTRIBUTES (A_RONLY | A_SYSTEM | A_DIR)
/* what find first/next calls look use */
typedef struct
{
char d_buf[21];
char d_attribute;
unsigned short d_time;
unsigned short d_date;
long d_size;
char d_name[13];
}
Dta_buf;
static char *getdirent ();
static void mysetdta ();
static void free_dircontents ();
static Dta_buf dtabuf;
static Dta_buf *dtapnt = &dtabuf;
static union REGS reg, nreg;
#if defined(M_I86LM)
static struct SREGS sreg;
#endif
DIR *
opendir (name)
char *name;
{
struct stat statb;
DIR *dirp;
char c;
char *s;
struct _dircontents *dp;
char nbuf[MAXPATHLEN + 1];
if (stat (name, &statb) < 0 || (statb.st_mode & S_IFMT) != S_IFDIR)
return (DIR *) NULL;
if (Newisnull (dirp, DIR))
return (DIR *) NULL;
if (*name && (c = name[strlen (name) - 1]) != '\\' && c != '/')
(void) strcat (strcpy (nbuf, name), "\\*.*");
else
(void) strcat (strcpy (nbuf, name), "*.*");
dirp->dd_loc = 0;
mysetdta ();
dirp->dd_contents = dirp->dd_cp = (struct _dircontents *) NULL;
if ((s = getdirent (nbuf)) == (char *) NULL)
return dirp;
do
{
if (Newisnull (dp, struct _dircontents) || (dp->_d_entry =
malloc ((unsigned) (strlen (s) + 1))) == (char *) NULL)
{
if (dp)
free ((char *) dp);
free_dircontents (dirp->dd_contents);
return (DIR *) NULL;
}
if (dirp->dd_contents)
dirp->dd_cp = dirp->dd_cp->_d_next = dp;
else
dirp->dd_contents = dirp->dd_cp = dp;
(void) strcpy (dp->_d_entry, s);
dp->_d_next = (struct _dircontents *) NULL;
}
while ((s = getdirent ((char *) NULL)) != (char *) NULL);
dirp->dd_cp = dirp->dd_contents;
return dirp;
}
void
closedir (dirp)
DIR *dirp;
{
free_dircontents (dirp->dd_contents);
free ((char *) dirp);
}
struct dirent *
readdir (dirp)
DIR *dirp;
{
static struct dirent dp;
if (dirp->dd_cp == (struct _dircontents *) NULL)
return (struct dirent *) NULL;
dp.d_namlen = dp.d_reclen =
strlen (strcpy (dp.d_name, dirp->dd_cp->_d_entry));
strlwr (dp.d_name); /* JF */
dp.d_ino = 0;
dirp->dd_cp = dirp->dd_cp->_d_next;
dirp->dd_loc++;
return &dp;
}
void
seekdir (dirp, off)
DIR *dirp;
long off;
{
long i = off;
struct _dircontents *dp;
if (off < 0)
return;
for (dp = dirp->dd_contents; --i >= 0 && dp; dp = dp->_d_next)
;
dirp->dd_loc = off - (i + 1);
dirp->dd_cp = dp;
}
long
telldir (dirp)
DIR *dirp;
{
return dirp->dd_loc;
}
static void
free_dircontents (dp)
struct _dircontents *dp;
{
struct _dircontents *odp;
while (dp)
{
if (dp->_d_entry)
free (dp->_d_entry);
dp = (odp = dp)->_d_next;
free ((char *) odp);
}
}
static char *
getdirent (dir)
char *dir;
{
if (dir != (char *) NULL)
{ /* get first entry */
reg.h.ah = DOSI_FINDF;
reg.h.cl = ATTRIBUTES;
#if defined(M_I86LM)
reg.x.dx = FP_OFF (dir);
sreg.ds = FP_SEG (dir);
#else
reg.x.dx = (unsigned) dir;
#endif
}
else
{ /* get next entry */
reg.h.ah = DOSI_FINDN;
#if defined(M_I86LM)
reg.x.dx = FP_OFF (dtapnt);
sreg.ds = FP_SEG (dtapnt);
#else
reg.x.dx = (unsigned) dtapnt;
#endif
}
#if defined(M_I86LM)
intdosx (®, &nreg, &sreg);
#else
intdos (®, &nreg);
#endif
if (nreg.x.cflag)
return (char *) NULL;
return dtabuf.d_name;
}
static void
mysetdta ()
{
reg.h.ah = DOSI_SDTA;
#if defined(M_I86LM)
reg.x.dx = FP_OFF (dtapnt);
sreg.ds = FP_SEG (dtapnt);
intdosx (®, &nreg, &sreg);
#else
reg.x.dx = (int) dtapnt;
intdos (®, &nreg);
#endif
}