Merge "cutils: Add clang FORTIFY support"

** If the property read fails or returns an empty value, the default

** value is used (if nonnull).

*/

int property_get(const char *key, char *value, const char *default_value);

int property_get(const char *key, char *value, const char *default_value)

/* Sometimes we use not-Bionic with this, so we need this check. */

#if defined(__BIONIC_FORTIFY)

        __overloadable __RENAME_CLANG(property_get)

#endif

        ;

/* property_get_bool: returns the value of key coerced into a

** boolean. If the property is not set, then the default value is returned.

int property_list(void (*propfn)(const char *key, const char *value, void *cookie), void *cookie);

#if defined(__BIONIC_FORTIFY) && !defined(__clang__)

#if defined(__BIONIC_FORTIFY)

#define __property_get_err_str "property_get() called with too small of a buffer"

#if defined(__clang__)

/* Some projects use -Weverything; enable_if is clang-specific.

** FIXME: This is marked used because we'll otherwise get complaints about an

** unused static function. This is more robust than marking it unused, since

** -Wused-but-marked-unused is a thing that will complain if this function is

** actually used, thus making FORTIFY noisier when an error happens. It's going

** to go away anyway during our FORTIFY cleanup.

**/

#pragma clang diagnostic push

#pragma clang diagnostic ignored "-Wgcc-compat"

__BIONIC_ERROR_FUNCTION_VISIBILITY

int property_get(const char *key, char *value, const char *default_value)

        __overloadable

        __enable_if(__bos(value) != __BIONIC_FORTIFY_UNKNOWN_SIZE &&

                    __bos(value) < PROPERTY_VALUE_MAX, __property_get_err_str)

        __errorattr(__property_get_err_str)

        __attribute__((used));

#pragma clang diagnostic pop

/* No object size? No FORTIFY.

*/

#else /* defined(__clang__) */

extern int __property_get_real(const char *, char *, const char *)

    __asm__(__USER_LABEL_PREFIX__ "property_get");

__errordecl(__property_get_too_small_error, "property_get() called with too small of a buffer");

__errordecl(__property_get_too_small_error, __property_get_err_str);

__BIONIC_FORTIFY_INLINE

int property_get(const char *key, char *value, const char *default_value) {

    return __property_get_real(key, value, default_value);

}

#endif

#endif /* defined(__clang__) */

#undef __property_get_err_str

#endif /* defined(__BIONIC_FORTIFY) */

#ifdef __cplusplus

}