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/*
* Copyright (C) 2004 Internet Systems Consortium, Inc. ("ISC")
* Copyright (C) 1999-2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
* REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
* AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
* LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/* $ISC: dir.c,v 1.18.2.1.2.3 2004/03/08 09:04:55 marka Exp $ */
/* Principal Authors: DCL */
#include <config.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>
#include <isc/dir.h>
#include <isc/magic.h>
#include <isc/string.h>
#include <isc/util.h>
#include "errno2result.h"
#define ISC_DIR_MAGIC ISC_MAGIC('D', 'I', 'R', '*')
#define VALID_DIR(dir) ISC_MAGIC_VALID(dir, ISC_DIR_MAGIC)
void
isc_dir_init(isc_dir_t *dir) {
REQUIRE(dir != NULL);
dir->entry.name[0] = '\0';
dir->entry.length = 0;
dir->handle = NULL;
dir->magic = ISC_DIR_MAGIC;
}
/*
* Allocate workspace and open directory stream. If either one fails,
* NULL will be returned.
*/
isc_result_t
isc_dir_open(isc_dir_t *dir, const char *dirname) {
isc_result_t result = ISC_R_SUCCESS;
REQUIRE(VALID_DIR(dir));
REQUIRE(dirname != NULL);
/*
* Open stream.
*/
dir->handle = opendir(dirname);
if (dir->handle == NULL)
return isc__errno2result(errno);
return (result);
}
/*
* Return previously retrieved file or get next one. Unix's dirent has
* separate open and read functions, but the Win32 and DOS interfaces open
* the dir stream and reads the first file in one operation.
*/
isc_result_t
isc_dir_read(isc_dir_t *dir) {
struct dirent *entry;
REQUIRE(VALID_DIR(dir) && dir->handle != NULL);
/*
* Fetch next file in directory.
*/
entry = readdir(dir->handle);
if (entry == NULL)
return (ISC_R_NOMORE);
/*
* Make sure that the space for the name is long enough.
*/
if (sizeof(dir->entry.name) <= strlen(entry->d_name))
return (ISC_R_UNEXPECTED);
strlcpy(dir->entry.name, entry->d_name, sizeof(dir->entry.name));
/*
* Some dirents have d_namlen, but it is not portable.
*/
dir->entry.length = strlen(entry->d_name);
return (ISC_R_SUCCESS);
}
/*
* Close directory stream.
*/
void
isc_dir_close(isc_dir_t *dir) {
REQUIRE(VALID_DIR(dir) && dir->handle != NULL);
(void)closedir(dir->handle);
dir->handle = NULL;
}
/*
* Reposition directory stream at start.
*/
isc_result_t
isc_dir_reset(isc_dir_t *dir) {
REQUIRE(VALID_DIR(dir) && dir->handle != NULL);
rewinddir(dir->handle);
return (ISC_R_SUCCESS);
}
isc_result_t
isc_dir_chdir(const char *dirname) {
/*
* Change the current directory to 'dirname'.
*/
REQUIRE(dirname != NULL);
if (chdir(dirname) < 0)
return (isc__errno2result(errno));
return (ISC_R_SUCCESS);
}
isc_result_t
isc_dir_chroot(const char *dirname) {
REQUIRE(dirname != NULL);
if (chroot(dirname) < 0)
return (isc__errno2result(errno));
return (ISC_R_SUCCESS);
}
isc_result_t
isc_dir_createunique(char *templet) {
isc_result_t result;
char *x;
char *p;
int i;
int pid;
REQUIRE(templet != NULL);
/*
* mkdtemp is not portable, so this emulates it.
*/
pid = getpid();
/*
* Replace trailing Xs with the process-id, zero-filled.
*/
for (x = templet + strlen(templet) - 1; *x == 'X' && x >= templet;
x--, pid /= 10)
*x = pid % 10 + '0';
x++; /* Set x to start of ex-Xs. */
do {
i = mkdir(templet, 0700);
if (i == 0 || errno != EEXIST)
break;
/*
* The BSD algorithm.
*/
p = x;
while (*p != '\0') {
if (isdigit(*p & 0xff))
*p = 'a';
else if (*p != 'z')
++*p;
else {
/*
* Reset character and move to next.
*/
*p++ = 'a';
continue;
}
break;
}
if (*p == '\0') {
/*
* Tried all combinations. errno should already
* be EEXIST, but ensure it is anyway for
* isc__errno2result().
*/
errno = EEXIST;
break;
}
} while (1);
if (i == -1)
result = isc__errno2result(errno);
else
result = ISC_R_SUCCESS;
return (result);
}
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