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refactor(fileio.c): refactor vim_rename()

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This commit is contained in:
Lewis Russell 2023-01-30 13:03:10 +00:00
parent b7d09695c4
commit 99149153c4
1 changed files with 36 additions and 37 deletions
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73
src/nvim/fileio.c
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@ -4410,6 +4410,38 @@ int put_time(FILE *fd, time_t time_)
return fwrite(buf, sizeof(uint8_t), ARRAY_SIZE(buf), fd) == 1 ? OK : FAIL;
}
static int rename_with_tmp(const char *const from, const char *const to)
{
// Find a name that doesn't exist and is in the same directory.
// Rename "from" to "tempname" and then rename "tempname" to "to".
if (strlen(from) >= MAXPATHL - 5) {
return -1;
}
char tempname[MAXPATHL + 1];
STRCPY(tempname, from);
for (int n = 123; n < 99999; n++) {
char *tail = path_tail(tempname);
snprintf(tail, (size_t)((MAXPATHL + 1) - (tail - tempname - 1)), "%d", n);
if (!os_path_exists(tempname)) {
if (os_rename(from, tempname) == OK) {
if (os_rename(tempname, to) == OK) {
return 0;
}
// Strange, the second step failed. Try moving the
// file back and return failure.
(void)os_rename(tempname, from);
return -1;
}
// If it fails for one temp name it will most likely fail
// for any temp name, give up.
return -1;
}
}
return -1;
}
/// os_rename() only works if both files are on the same file system, this
/// function will (attempts to?) copy the file across if rename fails -- webb
///
@ -4417,12 +4449,7 @@ int put_time(FILE *fd, time_t time_)
int vim_rename(const char *from, const char *to)
FUNC_ATTR_NONNULL_ALL
{
int fd_in;
int fd_out;
char *errmsg = NULL;
#ifdef HAVE_ACL
vim_acl_T acl; // ACL from original file
#endif
bool use_tmp_file = false;
// When the names are identical, there is nothing to do. When they refer
@ -4453,34 +4480,7 @@ int vim_rename(const char *from, const char *to)
}
if (use_tmp_file) {
char tempname[MAXPATHL + 1];
// Find a name that doesn't exist and is in the same directory.
// Rename "from" to "tempname" and then rename "tempname" to "to".
if (strlen(from) >= MAXPATHL - 5) {
return -1;
}
STRCPY(tempname, from);
for (int n = 123; n < 99999; n++) {
char *tail = path_tail(tempname);
snprintf(tail, (size_t)((MAXPATHL + 1) - (tail - tempname - 1)), "%d", n);
if (!os_path_exists(tempname)) {
if (os_rename(from, tempname) == OK) {
if (os_rename(tempname, to) == OK) {
return 0;
}
// Strange, the second step failed. Try moving the
// file back and return failure.
(void)os_rename(tempname, from);
return -1;
}
// If it fails for one temp name it will most likely fail
// for any temp name, give up.
return -1;
}
}
return -1;
return rename_with_tmp(from, to);
}
// Delete the "to" file, this is required on some systems to make the
@ -4498,9 +4498,9 @@ int vim_rename(const char *from, const char *to)
long perm = os_getperm(from);
#ifdef HAVE_ACL
// For systems that support ACL: get the ACL from the original file.
acl = os_get_acl(from);
vim_acl_T acl = os_get_acl(from);
#endif
fd_in = os_open((char *)from, O_RDONLY, 0);
int fd_in = os_open((char *)from, O_RDONLY, 0);
if (fd_in < 0) {
#ifdef HAVE_ACL
os_free_acl(acl);
@ -4509,8 +4509,7 @@ int vim_rename(const char *from, const char *to)
}
// Create the new file with same permissions as the original.
fd_out = os_open((char *)to,
O_CREAT|O_EXCL|O_WRONLY|O_NOFOLLOW, (int)perm);
int fd_out = os_open((char *)to, O_CREAT|O_EXCL|O_WRONLY|O_NOFOLLOW, (int)perm);
if (fd_out < 0) {
close(fd_in);
#ifdef HAVE_ACL