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Use function format attribute where applicable

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Allow the compiler to verify the format string against the supplied
arguments.

    chage.c:239:51: warning: format not a string literal, format string not checked [-Wformat-nonliteral]
      239 |                 (void) strftime (buf, sizeof buf, format, tp);
          |                                                   ^~~~~~
This commit is contained in:
Christian Göttsche
2022-08-05 17:40:42 +02:00
committed by Serge Hallyn
parent 477c8e6f42
commit c6c8130db4
5 changed files with 7 additions and 11 deletions
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2
lib/defines.h
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@@ -320,8 +320,10 @@ extern char *strerror ();
/* To be used for verified unused parameters */
#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
# define unused __attribute__((unused))
# define format_attr(type, index, check) __attribute__((format (type, index, check)))
#else
# define unused
# define format_attr(type, index, check)
#endif
/* ! Arguments evaluated twice ! */

2
lib/selinux.c
View File

@@ -109,7 +109,7 @@ int reset_selinux_file_context (void)
/*
* Log callback for libselinux internal error reporting.
*/
__attribute__((__format__ (printf, 2, 3)))
format_attr(printf, 2, 3)
static int selinux_log_cb (int type, const char *fmt, ...) {
va_list ap;
char *buf;

1
lib/semanage.c
View File

@@ -27,6 +27,7 @@
#endif
format_attr(printf, 3, 4)
static void semanage_error_callback (unused void *varg,
semanage_handle_t *handle,
const char *fmt, ...)

3
libmisc/copydir.c
View File

@@ -91,7 +91,8 @@ static int fchown_if_needed (int fdst, const struct stat *statp,
/*
* error_acl - format the error messages for the ACL and EQ libraries.
*/
static void error_acl (struct error_context *ctx, const char *fmt, ...)
format_attr(printf, 2, 3)
static void error_acl (unused struct error_context *ctx, const char *fmt, ...)
{
va_list ap;
FILE *shadow_logfd = log_get_logfd();

10
src/chage.c
View File

@@ -223,20 +223,12 @@ static void print_date (time_t date)
{
struct tm *tp;
char buf[80];
char format[80];
if (iflg) {
(void) snprintf (format, 80, "%%Y-%%m-%%d");
}
else {
(void) snprintf (format, 80, "%%b %%d, %%Y");
}
tp = gmtime (&date);
if (NULL == tp) {
(void) printf ("time_t: %lu\n", (unsigned long)date);
} else {
(void) strftime (buf, sizeof buf, format, tp);
(void) strftime (buf, sizeof buf, iflg ? "%%Y-%%m-%%d" : "%%b %%d, %%Y", tp);
(void) puts (buf);
}
}