/tmp/SlicerFreeSurfer/FreeSurfer/vtkFSSurfaceAnnotationReader.cxx: In member function ‘int vtkFSSurfaceAnnotationReader::ReadFSAnnotation()’:
/tmp/SlicerFreeSurfer/FreeSurfer/vtkFSSurfaceAnnotationReader.cxx:353:26: warning: passing argument 1 to restrict-qualified parameter aliases with argument 3 [-Wrestrict]
353 | sprintf (this->NamesList, "%s%3d {%s} ", this->NamesList,
| ~~~~~~^~~~~~~~~
This warning suggests that there is a potential issue with the use of the restrict
keyword in the function argument, and it is causing an aliasing problem.
The restrict
keyword is a C99 feature that tells the compiler that a particular pointer argument is not aliased by any other pointer in the same scope. In other words, if you use the restrict
keyword, you're telling the compiler that the pointer passed as an argument does not point to the same memory location as any other pointer passed to the same function.
In your case, passing this->NamesList
as the first argument to sprintf
with %s
format specifier is causing the warning. The %s
format specifier expects a null-terminated string, and since the sprintf
function can write to the memory location pointed to by this->NamesList
, it is possible that it can also write to memory locations pointed to by other pointers. This violates the restrict
keyword, which is meant to prevent such aliasing.
To fix this warning, you should consider using a different approach to write to this->NamesList
. You can either remove the restrict
keyword from the function argument, or you can use a temporary buffer to store the formatted string and then copy it to this->NamesList
using strcpy
or strncpy
. Here is an example of the second approach:
char tempBuffer[256]; // temporary buffer to store the formatted string
sprintf(tempBuffer, "%s%3d {%s} ", this->NamesList, someNumber, someString);
strncpy(this->NamesList, tempBuffer, sizeof(this->NamesList));
this->NamesList[sizeof(this->NamesList)-1] = '\0'; // make sure the string is null-terminated
In this example, we use sprintf
to format the string into tempBuffer
, and then we use strncpy
to copy the formatted string to this->NamesList
. We also make sure that the string is null-terminated by setting the last character to '\0'. This approach avoids the aliasing issue and should fix the warning.