char *
find_backup_file_name (char const *file, enum backup_type backup_type)
{
size_t filelen = strlen (file);
char *s;
size_t ssize;
bool simple = true;
/* Initialize the default simple backup suffix. */
if (! simple_backup_suffix)
{
char const *env_suffix = getenv ("SIMPLE_BACKUP_SUFFIX");
if (env_suffix && *env_suffix)
simple_backup_suffix = env_suffix;
else
simple_backup_suffix = "~";
}
/* Allow room for simple or ".~N~" backups. The guess must be at
least sizeof ".~1~", but otherwise will be adjusted as needed. */
size_t simple_backup_suffix_size = strlen (simple_backup_suffix) + 1;
size_t backup_suffix_size_guess = simple_backup_suffix_size;
enum { GUESS = sizeof ".~12345~" };
if (backup_suffix_size_guess < GUESS)
backup_suffix_size_guess = GUESS;
ssize = filelen + backup_suffix_size_guess + 1;
s = xmalloc (ssize);
memcpy (s, file, filelen + 1);
if (backup_type != simple_backups)
switch (numbered_backup (&s, ssize, filelen))
{
case BACKUP_IS_SAME_LENGTH:
return s;
case BACKUP_IS_LONGER:
simple = false;
break;
case BACKUP_IS_NEW:
simple = (backup_type == numbered_existing_backups);
break;
}
if (simple)
memcpy (s + filelen, simple_backup_suffix, simple_backup_suffix_size);
check_extension (s, filelen, '~');
return s;
}
char *
find_backup_file_name (char const *file, enum backup_type backup_type)
{
size_t filelen = strlen (file);
char *s;
size_t ssize;
bool simple = true;
/* Allow room for simple or ".~N~" backups. The guess must be at
least sizeof ".~1~", but otherwise will be adjusted as needed. */
size_t simple_backup_suffix_size = strlen (simple_backup_suffix) + 1;
size_t backup_suffix_size_guess = simple_backup_suffix_size;
enum { GUESS = sizeof ".~12345~" };
if (HAVE_DIR && backup_suffix_size_guess < GUESS)
backup_suffix_size_guess = GUESS;
ssize = filelen + backup_suffix_size_guess + 1;
s = xmalloc (ssize);
memcpy (s, file, filelen + 1);
#if HAVE_DIR
if (backup_type != simple_backups)
switch (numbered_backup (&s, ssize, filelen))
{
case BACKUP_IS_SAME_LENGTH:
return s;
case BACKUP_IS_LONGER:
simple = false;
break;
case BACKUP_IS_NEW:
simple = (backup_type == numbered_existing_backups);
break;
}
#endif
if (simple)
memcpy (s + filelen, simple_backup_suffix, simple_backup_suffix_size);
check_extension (s, filelen, '~');
return s;
}
