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-rw-r--r--src/libgamma-facade.c32
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;