diff options
Diffstat (limited to 'libgamma_get_crtc_information.c')
| -rw-r--r-- | libgamma_get_crtc_information.c | 27 |
1 files changed, 25 insertions, 2 deletions
diff --git a/libgamma_get_crtc_information.c b/libgamma_get_crtc_information.c index 5c7e2fe..58011dd 100644 --- a/libgamma_get_crtc_information.c +++ b/libgamma_get_crtc_information.c @@ -6,23 +6,46 @@ * Read information about a CRTC * * @param this Instance of a data structure to fill with the information about the CRTC + * @param size Should be `sizeof(*this)`, used to let the library know which version + * of the structure is used so that it does not write outside of it * @param crtc The state of the CRTC whose information should be read * @param fields OR:ed identifiers for the information about the CRTC that should be read * @return Zero on success, -1 on error; on error refer to the error reports in `this` */ int -libgamma_get_crtc_information(libgamma_crtc_information_t *restrict this, libgamma_crtc_state_t *restrict crtc, int32_t fields) +libgamma_get_crtc_information(libgamma_crtc_information_t *restrict this, size_t size, + libgamma_crtc_state_t *restrict crtc, unsigned long long fields) { + libgamma_crtc_information_t info_; + int r, (*func)(libgamma_crtc_information_t *restrict, libgamma_crtc_state_t *restrict, unsigned long long); + this->edid = NULL; this->connector_name = NULL; switch (crtc->partition->site->method) { #define X(CONST, CNAME, ...)\ case CONST:\ - return libgamma_##CNAME##_get_crtc_information(this, crtc, fields); + func = libgamma_##CNAME##_get_crtc_information;\ + break; LIST_AVAILABLE_METHODS(X) #undef X default: return LIBGAMMA_NO_SUCH_ADJUSTMENT_METHOD; } + + if (size == sizeof(info_)) { + r = func(this, crtc, fields); + this->struct_version = LIBGAMMA_CRTC_INFORMATION_STRUCT_VERSION; + return r; + } else { + info_.struct_version = LIBGAMMA_CRTC_INFORMATION_STRUCT_VERSION; + r = func(&info_, crtc, fields); + if (size < sizeof(info_)) { + memcpy(this, &info_, size); + } else { + memcpy(this, &info_, sizeof(info_)); + memset(&((char *)this)[size], 0, size - sizeof(info_)); + } + return r; + } } |