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146 lines
3.7 KiB
146 lines
3.7 KiB
/*
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* Copyright © 2015 Collabora, Ltd.
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial
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* portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* 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 <stdlib.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 File path
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* \param prefix File name prefix.
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* \param suffix File name suffix.
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* \param[out] name_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, const char *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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int with_path;
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with_path = path && path[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%s%s",
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with_path ? path : "", with_path ? "/" : "",
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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%s%s-%d%s",
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with_path ? path : "", with_path ? "/" : "",
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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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char *
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file_name_with_datadir(const char *filename)
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{
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const char *base = getenv("WESTON_DATA_DIR");
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char *out;
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int len;
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if (base)
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len = asprintf(&out, "%s/%s", base, filename);
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else
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len = asprintf(&out, "%s/weston/%s", DATADIR, filename);
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if (len == -1)
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return NULL;
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return out;
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}
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