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Fri, 7 Jun 2024 02:38:46 -0400 (EDT) Received: by localhost (OpenSMTPD) with ESMTPSA id e8035734 (TLSv1.3:TLS_AES_256_GCM_SHA384:256:NO); Fri, 7 Jun 2024 06:38:46 +0000 (UTC) Date: Fri, 7 Jun 2024 08:38:44 +0200 From: Patrick Steinhardt To: git@vger.kernel.org Cc: Jeff King , Junio C Hamano , Eric Sunshine Subject: [PATCH v6 15/27] compat/win32: fix const-correctness with string constants Message-ID: <57402de20a36d1063c4abf0e0af3e3c3c647d868.1717740366.git.ps@pks.im> References: Precedence: bulk X-Mailing-List: git@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: Adjust various places in our Win32 compatibility layer where we are not assigning string constants to `const char *` variables. Signed-off-by: Patrick Steinhardt --- compat/basename.c | 16 ++++++++++++++-- compat/mingw.c | 28 ++++++++++++++++------------ compat/winansi.c | 2 +- 3 files changed, 31 insertions(+), 15 deletions(-) diff --git a/compat/basename.c b/compat/basename.c index 96bd9533b4..c33579ef61 100644 --- a/compat/basename.c +++ b/compat/basename.c @@ -10,7 +10,13 @@ char *gitbasename (char *path) skip_dos_drive_prefix(&path); if (!path || !*path) - return "."; + /* + * basename(3P) is mis-specified because it returns a + * non-constant pointer even though it is specified to return a + * pointer to internal memory at times. The cast is a result of + * that. + */ + return (char *) "."; for (base = path; *path; path++) { if (!is_dir_sep(*path)) @@ -34,7 +40,13 @@ char *gitdirname(char *path) int dos_drive_prefix; if (!p) - return "."; + /* + * dirname(3P) is mis-specified because it returns a + * non-constant pointer even though it is specified to return a + * pointer to internal memory at times. The cast is a result of + * that. + */ + return (char *) "."; if ((dos_drive_prefix = skip_dos_drive_prefix(&p)) && !*p) goto dot; diff --git a/compat/mingw.c b/compat/mingw.c index 6b06ea540f..d378cd04cb 100644 --- a/compat/mingw.c +++ b/compat/mingw.c @@ -2279,7 +2279,11 @@ struct passwd *getpwuid(int uid) p->pw_name = user_name; p->pw_gecos = get_extended_user_info(NameDisplay); if (!p->pw_gecos) - p->pw_gecos = "unknown"; + /* + * Data returned by getpwuid(3P) is treated as internal and + * must never be written to or freed. + */ + p->pw_gecos = (char *) "unknown"; p->pw_dir = NULL; initialized = 1; @@ -2800,16 +2804,16 @@ int is_path_owned_by_current_sid(const char *path, struct strbuf *report) strbuf_addf(report, "'%s' is on a file system that does " "not record ownership\n", path); } else if (report) { - LPSTR str1, str2, str3, str4, to_free1 = NULL, - to_free3 = NULL, to_local_free2 = NULL, - to_local_free4 = NULL; + PCSTR str1, str2, str3, str4; + LPSTR to_free1 = NULL, to_free3 = NULL, + to_local_free2 = NULL, to_local_free4 = NULL; - if (user_sid_to_user_name(sid, &str1)) - to_free1 = str1; + if (user_sid_to_user_name(sid, &to_free1)) + str1 = to_free1; else str1 = "(inconvertible)"; - if (ConvertSidToStringSidA(sid, &str2)) - to_local_free2 = str2; + if (ConvertSidToStringSidA(sid, &to_local_free2)) + str2 = to_local_free2; else str2 = "(inconvertible)"; @@ -2822,13 +2826,13 @@ int is_path_owned_by_current_sid(const char *path, struct strbuf *report) str4 = "(invalid)"; } else { if (user_sid_to_user_name(current_user_sid, - &str3)) - to_free3 = str3; + &to_free3)) + str3 = to_free3; else str3 = "(inconvertible)"; if (ConvertSidToStringSidA(current_user_sid, - &str4)) - to_local_free4 = str4; + &to_local_free4)) + str4 = to_local_free4; else str4 = "(inconvertible)"; } diff --git a/compat/winansi.c b/compat/winansi.c index f83610f684..575813bde8 100644 --- a/compat/winansi.c +++ b/compat/winansi.c @@ -139,7 +139,7 @@ static void write_console(unsigned char *str, size_t len) /* convert utf-8 to utf-16 */ int wlen = xutftowcsn(wbuf, (char*) str, ARRAY_SIZE(wbuf), len); if (wlen < 0) { - wchar_t *err = L"[invalid]"; + const wchar_t *err = L"[invalid]"; WriteConsoleW(console, err, wcslen(err), &dummy, NULL); return; }