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file-util: allow specifying path separately in file_create_dated()

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Instead of assuming the file prefix contains the path and filename
prefix, give these two items separately.

A NULL or empty string path may still be given to refer to the current
directory.

Signed-off-by: Aleksander Morgado <aleksander@aleksander.es>
Reviewed-by: Daniel Stone <daniels@collabora.com>
This commit is contained in:
Aleksander Morgado
2018-01-23 01:05:21 +01:00
committed by Daniel Stone
parent e3c2a76d8f
commit 72032accbf
4 changed files with 16 additions and 10 deletions
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shared/file-util.c
+13 -7
View File
@@ -66,14 +66,15 @@ create_file_excl(const char *fname)
/** Create a unique file with date and time in the name
*
* \param path_prefix Path and file name prefix.
* \param path File path
* \param prefix 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
* 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.
@@ -82,19 +83,23 @@ create_file_excl(const char *fname)
* On failure, the contents of name_out are undefined and errno is set.
*/
FILE *
file_create_dated(const char *path_prefix, const char *suffix,
file_create_dated(const char *path, const char *prefix, const char *suffix,
char *name_out, size_t name_len)
{
char timestr[128];
int ret;
int fd;
int cnt = 0;
int with_path;
with_path = path && path[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);
ret = snprintf(name_out, name_len, "%s%s%s%s%s",
with_path ? path : "", with_path ? "/" : "",
prefix, timestr, suffix);
if (ret < 0 || (size_t)ret >= name_len) {
errno = ENOBUFS;
return NULL;
@@ -105,8 +110,9 @@ file_create_dated(const char *path_prefix, const char *suffix,
while (fd == -1 && errno == EEXIST) {
cnt++;
ret = snprintf(name_out, name_len, "%s%s-%d%s",
path_prefix, timestr, cnt, suffix);
ret = snprintf(name_out, name_len, "%s%s%s%s-%d%s",
with_path ? path : "", with_path ? "/" : "",
prefix, timestr, cnt, suffix);
if (ret < 0 || (size_t)ret >= name_len) {
errno = ENOBUFS;
return NULL;
shared/file-util.h
+1 -1
View File
@@ -33,7 +33,7 @@ extern "C" {
#include <stdio.h>
FILE *
file_create_dated(const char *path_prefix, const char *suffix,
file_create_dated(const char *path, const char *prefix, const char *suffix,
char *name_out, size_t name_len);
char *