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New functions isc_file_template(), isc_file_renameunique().

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isc_file_template() allows the caller to specify the prefix unlike
isc_file_mktemplate().  The later is now written using isc_file_template().
This commit is contained in:
Mark Andrews 2000-10-03 05:45:39 +00:00
parent a6368669a6
commit 9282d220f4
2 changed files with 52 additions and 6 deletions
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18
lib/isc/include/isc/file.h
View file

@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: file.h,v 1.11 2000/09/08 21:46:58 gson Exp $ */
/* $Id: file.h,v 1.12 2000/10/03 05:45:38 marka Exp $ */
#ifndef ISC_FILE_H
#define ISC_FILE_H 1
@ -171,6 +171,22 @@ isc_file_isabsolute(const char *filename);
* Return ISC_TRUE iff the given file name is absolute.
*/
isc_result_t
isc_file_template(const char *path, const char *templat, char *buf,
size_t buflen);
/*
* Create a OS specific template using 'path' to define the directory
* 'templat' to describe the filename and store the result in 'buf'
* such that path can be renamed to buf atomically.
*/
isc_result_t
isc_file_renameunique(const char *file, char *templet);
/*
* Rename 'file' using 'templet' as template for the new file name.
*/
/*
* XXX We should also have a isc_file_writeeopen() function
* for safely open a file in a publicly writable directory

40
lib/isc/unix/file.c
View file

@ -15,7 +15,7 @@
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/* $Id: file.c,v 1.22 2000/09/08 21:46:59 gson Exp $ */
/* $Id: file.c,v 1.23 2000/10/03 05:45:39 marka Exp $ */
#include <config.h>
@ -117,29 +117,59 @@ isc_file_settime(const char *file, isc_time_t *time) {
isc_result_t
isc_file_mktemplate(const char *path, char *buf, size_t buflen) {
return (isc_file_template(path, TEMPLATE, buf, buflen));
}
isc_result_t
isc_file_template(const char *path, const char *templat, char *buf,
size_t buflen) {
char *s;
REQUIRE(buf != NULL);
s = strrchr(templat, '/');
if (s != NULL)
templat = s + 1;
s = strrchr(path, '/');
if (s != NULL) {
if ((s - path + 1 + sizeof(TEMPLATE)) > buflen)
if ((s - path + 1 + strlen(templat) + 1) > buflen)
return (ISC_R_NOSPACE);
strncpy(buf, path, s - path + 1);
buf[s - path + 1] = '\0';
strcat(buf, TEMPLATE);
strcat(buf, templat);
} else {
if (sizeof(TEMPLATE) > buflen)
if ((strlen(templat) + 1) > buflen)
return (ISC_R_NOSPACE);
strcpy(buf, TEMPLATE);
strcpy(buf, templat);
}
return (ISC_R_SUCCESS);
}
isc_result_t
isc_file_renameunique(const char *file, char *templet) {
int fd = -1;
int res = 0;
isc_result_t result = ISC_R_SUCCESS;
fd = mkstemp(templet);
if (fd == -1) {
result = isc__errno2result(errno);
}
if (result == ISC_R_SUCCESS) {
res = rename(file, templet);
if (res != 0)
result = isc__errno2result(errno);
}
if (fd != -1)
close(fd);
return (result);
}
isc_result_t
isc_file_openunique(char *templet, FILE **fp) {
int fd;