diff options
Diffstat (limited to 'src/libgamma-facade.c')
| -rw-r--r-- | src/libgamma-facade.c | 32 |
1 files changed, 18 insertions, 14 deletions
diff --git a/src/libgamma-facade.c b/src/libgamma-facade.c index 25a7ba8..528a2fd 100644 --- a/src/libgamma-facade.c +++ b/src/libgamma-facade.c @@ -159,6 +159,9 @@ static int libgamma_list_method_test(int method, int operation) * List available adjustment methods by their order of preference based on the environment * * @param methods Output array of methods, should be able to hold `GAMMA_METHOD_COUNT` elements + * @þaram buf_size The number of elements that fits in `methods`, it should be `GAMMA_METHOD_COUNT`, + * This is used to avoid writing outside the output buffer if this library adds new + * adjustment methods without the users of the library recompiling * @param operation Allowed values: * 0: Methods that the environment suggests will work, excluding fake. * 1: Methods that the environment suggests will work, including fake. @@ -166,9 +169,10 @@ static int libgamma_list_method_test(int method, int operation) * 3: All real methods. * 4: All methods. * Other values invoke undefined behaviour. - * @return The number of element that have been stored in `methods` + * @return The number of element that have been stored in `methods`, or should + * have been stored if the buffer was large enought */ -size_t libgamma_list_methods(int* restrict methods, int operation) +size_t libgamma_list_methods(int* restrict methods, size_t buf_size, int operation) { #ifdef HAVE_NO_GAMMA_METHODS (void) methods; @@ -178,28 +182,28 @@ size_t libgamma_list_methods(int* restrict methods, int operation) size_t n = 0; #ifdef HAVE_GAMMA_METHOD_X_RANDR - if (libgamma_list_method_test(GAMMA_METHOD_X_RANDR, operation)) - methods[n++] = GAMMA_METHOD_X_RANDR; + if (libgamma_list_method_test(GAMMA_METHOD_X_RANDR, operation) && (n++ < buf_size)) + methods[n - 1] = GAMMA_METHOD_X_RANDR; #endif #ifdef HAVE_GAMMA_METHOD_X_VIDMODE - if (libgamma_list_method_test(GAMMA_METHOD_X_VIDMODE, operation)) - methods[n++] = GAMMA_METHOD_X_VIDMODE; + if (libgamma_list_method_test(GAMMA_METHOD_X_VIDMODE, operation) && (n++ < buf_size)) + methods[n - 1] = GAMMA_METHOD_X_VIDMODE; #endif #ifdef HAVE_GAMMA_METHOD_LINUX_DRM - if (libgamma_list_method_test(GAMMA_METHOD_LINUX_DRM, operation)) - methods[n++] = GAMMA_METHOD_LINUX_DRM; + if (libgamma_list_method_test(GAMMA_METHOD_LINUX_DRM, operation) && (n++ < buf_size)) + methods[n - 1] = GAMMA_METHOD_LINUX_DRM; #endif #ifdef HAVE_GAMMA_METHOD_W32_GDI - if (libgamma_list_method_test(GAMMA_METHOD_W32_GDI, operation)) - methods[n++] = GAMMA_METHOD_W32_GDI; + if (libgamma_list_method_test(GAMMA_METHOD_W32_GDI, operation) && (n++ < buf_size)) + methods[n - 1] = GAMMA_METHOD_W32_GDI; #endif #ifdef HAVE_GAMMA_METHOD_QUARTZ_CORE_GRAPHICS - if (libgamma_list_method_test(GAMMA_METHOD_QUARTZ_CORE_GRAPHICS, operation)) - methods[n++] = GAMMA_METHOD_QUARTZ_CORE_GRAPHICS; + if (libgamma_list_method_test(GAMMA_METHOD_QUARTZ_CORE_GRAPHICS, operation) && (n++ < buf_size)) + methods[n - 1] = GAMMA_METHOD_QUARTZ_CORE_GRAPHICS; #endif #ifdef HAVE_GAMMA_METHOD_DUMMY - if (libgamma_list_method_test(GAMMA_METHOD_DUMMY, operation)) - methods[n++] = GAMMA_METHOD_DUMMY; + if (libgamma_list_method_test(GAMMA_METHOD_DUMMY, operation) && (n++ < buf_size)) + methods[n - 1] = GAMMA_METHOD_DUMMY; #endif return n; |