/** Create a unique file with date and time in the name
*
* \param path_prefix Path and file name prefix.
* \param suffix File name suffix.
* \param name_out[out] Buffer for the resulting file name.
* \param name_len Number of bytes usable in name_out.
* \return stdio FILE pointer, or NULL on failure.
*
* Create and open a new file with the name concatenated from
* path_prefix, date and time, and suffix. If a file with this name
* already exists, an counter number is added to the end of the
* date and time sub-string. The counter is increased until a free file
* name is found.
*
* Once creating the file succeeds, the name of the file is in name_out.
* On failure, the contents of name_out are undefined and errno is set.
*/
FILE *
file_create_dated(const char *path_prefix, const char *suffix,
char *name_out, size_t name_len)
{
char timestr[128];
int ret;
int fd;
int cnt = 0;
if (current_time_str(timestr, sizeof(timestr), "%F_%H-%M-%S") < 0)
return NULL;
ret = snprintf(name_out, name_len, "%s%s%s",
path_prefix, timestr, suffix);
if (ret < 0 || (size_t)ret >= name_len) {
errno = ENOBUFS;
return NULL;
}
fd = create_file_excl(name_out);
while (fd == -1 && errno == EEXIST) {
cnt++;
ret = snprintf(name_out, name_len, "%s%s-%d%s",
path_prefix, timestr, cnt, suffix);
if (ret < 0 || (size_t)ret >= name_len) {
errno = ENOBUFS;
return NULL;
}
fd = create_file_excl(name_out);
}
if (fd == -1)
return NULL;
return fdopen(fd, "w");
}
void pkcs11_logger_log_separator(void)
{
char str_time[20];
current_time_str(str_time, sizeof(str_time));
pkcs11_logger_log("****************************** %s ***", str_time);
}