diff options
Diffstat (limited to 'src/lib/fs/files.c')
| -rw-r--r-- | src/lib/fs/files.c | 38 |
1 files changed, 37 insertions, 1 deletions
diff --git a/src/lib/fs/files.c b/src/lib/fs/files.c index ec7dbca0e9..aff78db718 100644 --- a/src/lib/fs/files.c +++ b/src/lib/fs/files.c @@ -1,6 +1,6 @@ /* Copyright (c) 2003-2004, Roger Dingledine * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. - * Copyright (c) 2007-2019, The Tor Project, Inc. */ + * Copyright (c) 2007-2020, The Tor Project, Inc. */ /* See LICENSE for licensing information */ /** @@ -247,6 +247,22 @@ file_status(const char *fname) } } +/** Returns true if <b>file_type</b> represents an existing file (even if + * empty). Returns false otherwise. */ +bool +is_file(file_status_t file_type) +{ + return file_type != FN_ERROR && file_type != FN_NOENT && file_type != FN_DIR; +} + +/** Returns true if <b>file_type</b> represents an existing directory. Returns + * false otherwise. */ +bool +is_dir(file_status_t file_type) +{ + return file_type == FN_DIR; +} + /** Create a file named <b>fname</b> with the contents <b>str</b>. Overwrite * the previous <b>fname</b> if possible. Return 0 on success, -1 on failure. * @@ -718,6 +734,26 @@ read_file_to_str, (const char *filename, int flags, struct stat *stat_out)) return string; } +/** Attempt to read a file <b>fname</b>. If the file's contents is + * equal to the string <b>str</b>, return 0. Otherwise, attempt to + * overwrite the file with the contents of <b>str</b> and return + * the value of write_str_to_file(). + */ +int +write_str_to_file_if_not_equal(const char *fname, const char *str) +{ + char *fstr = read_file_to_str(fname, RFTS_IGNORE_MISSING, NULL); + int rv; + + if (!fstr || strcmp(str, fstr)) { + rv = write_str_to_file(fname, str, 0); + } else { + rv = 0; + } + tor_free(fstr); + return rv; +} + #if !defined(HAVE_GETDELIM) || defined(TOR_UNIT_TESTS) #include "ext/getdelim.c" #endif |