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/* $Header: directory.c,v 4.0 91/03/20 01:34:24 lwall Locked $
*
* (C) Copyright 1987, 1988, 1990 Diomidis Spinellis.
*
* You may distribute under the terms of the GNU General Public License
* as specified in the README file that comes with the perl 3.0 kit.
*
* $Log: directory.c,v $
* Revision 4.0 91/03/20 01:34:24 lwall
* 4.0 baseline.
*
* Revision 3.0.1.1 90/03/27 16:07:37 lwall
* patch16: MSDOS support
*
* Revision 1.3 90/03/16 22:39:40 dds
* Fixed malloc problem.
*
* Revision 1.2 88/07/23 00:08:39 dds
* Added inode non-zero filling.
*
* Revision 1.1 88/07/23 00:03:50 dds
* Initial revision
*
*/
/*
* UNIX compatible directory access functions
*/
#include <sys/types.h>
#include <sys/dir.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <dos.h>
#include <ctype.h>
/*
* File names are converted to lowercase if the
* CONVERT_TO_LOWER_CASE variable is defined.
*/
#define CONVERT_TO_LOWER_CASE
#define PATHLEN 65
#ifndef lint
static char rcsid[] = "$Header: directory.c,v 4.0 91/03/20 01:34:24 lwall Locked $";
#endif
DIR *
opendir(char *filename)
{
DIR *p;
char *oldresult, *result;
union REGS srv;
struct SREGS segregs;
register reslen = 0;
char scannamespc[PATHLEN];
char *scanname = scannamespc; /* To take address we need a pointer */
/*
* Structure used by the MS-DOS directory system calls.
*/
struct dir_buff {
char reserved[21]; /* Reserved for MS-DOS */
unsigned char attribute; /* Attribute */
unsigned int time; /* Time */
unsigned int date; /* Date */
long size; /* Size of file */
char fn[13]; /* Filename */
} buffspc, *buff = &buffspc;
if (!(p = (DIR *) malloc(sizeof(DIR))))
return NULL;
/* Initialize result to use realloc on it */
if (!(result = malloc(1))) {
free(p);
return NULL;
}
/* Create the search pattern */
strcpy(scanname, filename);
if (strchr("/\\", *(scanname + strlen(scanname) - 1)) == NULL)
strcat(scanname, "/*.*");
else
strcat(scanname, "*.*");
segread(&segregs);
#if ( defined(M_I86LM) || defined(M_I86CM) || defined(M_I86HM) )
segregs.ds = FP_SEG(buff);
srv.x.dx = FP_OFF(buff);
#else
srv.x.dx = (unsigned int) buff;
#endif
srv.h.ah = 0x1a; /* Set DTA to DS:DX */
intdosx(&srv, &srv, &segregs);
#if ( defined(M_I86LM) || defined(M_I86CM) || defined(M_I86HM) )
segregs.ds = FP_SEG(scanname);
srv.x.dx = FP_OFF(scanname);
#else
srv.x.dx = (unsigned int) scanname;
#endif
srv.x.cx = 0xff; /* Search mode */
for (srv.h.ah = 0x4e; !intdosx(&srv, &srv, &segregs); srv.h.ah = 0x4f) {
if ((result = (char *) realloc(result, reslen + strlen(buff->fn) + 1)) ==
NULL) {
free(p);
free(oldresult);
return NULL;
}
oldresult = result;
#ifdef CONVERT_TO_LOWER_CASE
strcpy(result + reslen, strlwr(buff->fn));
#else
strcpy(result + reslen, buff->fn);
#endif
reslen += strlen(buff->fn) + 1;
}
if (!(result = realloc(result, reslen + 1))) {
free(p);
free(oldresult);
return NULL;
} else {
p->start = result;
p->curr = result;
*(result + reslen) = '\0';
return p;
}
}
struct direct *
readdir(DIR *dirp)
{
char *p;
register len;
static dummy;
p = dirp->curr;
len = strlen(p);
if (*p) {
dirp->curr += len + 1;
strcpy(dirp->dirstr.d_name, p);
dirp->dirstr.d_namlen = len;
/* To fool programs */
dirp->dirstr.d_ino = ++dummy;
return &(dirp->dirstr);
} else
return NULL;
}
long
telldir(DIR *dirp)
{
return (long) dirp->curr; /* ouch! pointer to long cast */
}
void
seekdir(DIR *dirp, long loc)
{
dirp->curr = (char *) loc; /* ouch! long to pointer cast */
}
void
rewinddir(DIR *dirp)
{
dirp->curr = dirp->start;
}
void
closedir(DIR *dirp)
{
free(dirp->start);
free(dirp);
}
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