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118 lines
3.2 KiB
118 lines
3.2 KiB
/*
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* Copyright © 2015 Collabora, Ltd.
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*
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* Permission to use, copy, modify, distribute, and sell this software and
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* its documentation for any purpose is hereby granted without fee, provided
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* that the above copyright notice appear in all copies and that both that
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* copyright notice and this permission notice appear in supporting
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* documentation, and that the name of the copyright holders not be used in
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* advertising or publicity pertaining to distribution of the software
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* without specific, written prior permission. The copyright holders make
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* no representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS
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* SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS, IN NO EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY
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* SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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* RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
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* CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <errno.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include "file-util.h"
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static int
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current_time_str(char *str, size_t len, const char *fmt)
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{
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time_t t;
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struct tm *t_local;
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int ret;
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t = time(NULL);
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t_local = localtime(&t);
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if (!t_local) {
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errno = ETIME;
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return -1;
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}
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ret = strftime(str, len, fmt, t_local);
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if (ret == 0) {
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errno = ETIME;
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return -1;
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}
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return ret;
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}
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static int
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create_file_excl(const char *fname)
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{
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return open(fname, O_RDWR | O_CLOEXEC | O_CREAT | O_EXCL, 00666);
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}
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/** Create a unique file with date and time in the name
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*
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* \param path_prefix Path and file name prefix.
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* \param suffix File name suffix.
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* \param name_out[out] Buffer for the resulting file name.
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* \param name_len Number of bytes usable in name_out.
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* \return stdio FILE pointer, or NULL on failure.
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*
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* Create and open a new file with the name concatenated from
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* path_prefix, date and time, and suffix. If a file with this name
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* already exists, an counter number is added to the end of the
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* date and time sub-string. The counter is increased until a free file
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* name is found.
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*
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* Once creating the file succeeds, the name of the file is in name_out.
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* On failure, the contents of name_out are undefined and errno is set.
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*/
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FILE *
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file_create_dated(const char *path_prefix, const char *suffix,
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char *name_out, size_t name_len)
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{
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char timestr[128];
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int ret;
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int fd;
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int cnt = 0;
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if (current_time_str(timestr, sizeof(timestr), "%F_%H-%M-%S") < 0)
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return NULL;
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ret = snprintf(name_out, name_len, "%s%s%s",
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path_prefix, timestr, suffix);
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if (ret < 0 || (size_t)ret >= name_len) {
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errno = ENOBUFS;
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return NULL;
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}
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fd = create_file_excl(name_out);
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while (fd == -1 && errno == EEXIST) {
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cnt++;
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ret = snprintf(name_out, name_len, "%s%s-%d%s",
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path_prefix, timestr, cnt, suffix);
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if (ret < 0 || (size_t)ret >= name_len) {
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errno = ENOBUFS;
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return NULL;
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}
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fd = create_file_excl(name_out);
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}
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if (fd == -1)
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return NULL;
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return fdopen(fd, "w");
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}
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