scsh-0.6/scsh/dirstuff1.c

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/* Here is stuff for interfacing to directories.
** Copyright (c) 1993, 1994 by Olin Shivers.
*/
#include <sys/types.h>
#include <stdio.h>
#include <dirent.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
/* Make sure our exports match up w/the implementation: */
#include "scheme48.h"
#include "dirstuff1.h"
s48_value directory_files(s48_value sch_dirname)
{
struct dirent *dirent;
DIR *d;
s48_value dirlist = S48_NULL;
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S48_DECLARE_GC_PROTECT(1);
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S48_GC_PROTECT_1(dirlist);
if( NULL == (d = opendir(s48_extract_string (sch_dirname))) )
s48_raise_os_error_1 (errno, sch_dirname);
while( NULL != (dirent = readdir(d)) ) {
if((strcmp(dirent->d_name,".") == 0) || (strcmp(dirent->d_name,"..") == 0))
continue;
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dirlist = s48_cons (s48_enter_string (dirent->d_name),
dirlist);
}
if (closedir(d) == -1)
s48_raise_os_error_1 (errno, sch_dirname);
S48_GC_UNPROTECT ();
return dirlist;
}
s48_value
scm_opendir(s48_value dirname)
{
DIR *dp;
s48_value res;
char *c_name;
c_name = s48_extract_string(dirname);
dp = opendir(c_name);
if (dp == NULL)
s48_raise_os_error_1(errno, dirname);
res = S48_MAKE_VALUE(DIR *);
S48_UNSAFE_EXTRACT_VALUE(res, DIR *) = dp;
return (res);
}
/*
* Interface to closedir.
* Note, it is ok to call closedir on an already closed directory.
*/
s48_value
scm_closedir(s48_value dirstream)
{
DIR **dpp;
dpp = S48_EXTRACT_VALUE_POINTER(dirstream, DIR *);
if (*dpp != (DIR *)NULL) {
int status = closedir(*dpp);
if (status == -1)
s48_raise_os_error_1(errno, dirstream);
*dpp = (DIR *)NULL;
}
return (S48_UNSPECIFIC);
}
/*
* Interface to readdir.
* If we have already read all the files that are in the directory,
* #F is returned. Otherwise, a string with the next file name.
* Note, "." and ".." are never returned.
*/
s48_value
scm_readdir(s48_value dirstream)
{
DIR **dpp;
struct dirent *dep;
char *name;
dpp = S48_EXTRACT_VALUE_POINTER(dirstream, DIR *);
if (*dpp == (DIR *)NULL)
s48_raise_argument_type_error(dirstream); /* not really correct error */
do {
errno = 0;
dep = readdir(*dpp);
if (dep == (struct dirent *)NULL) {
if (errno != 0)
s48_raise_os_error_1(errno, dirstream);
return (S48_FALSE);
}
name = dep->d_name;
} while ((name[0] == '.')
&& (name[1] == '\0' || (name[1] == '.' && name[2] == '\0')));
return s48_enter_string(name);
}
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void s48_init_dirstuff (){
S48_EXPORT_FUNCTION(directory_files);
S48_EXPORT_FUNCTION(scm_opendir);
S48_EXPORT_FUNCTION(scm_readdir);
S48_EXPORT_FUNCTION(scm_closedir);
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}