Also ensure filename is a sufficiently long string to hold any possible output from the format.
> On Jul 12, 2024, at 6:53 AM, Matthew Knepley <knep...@gmail.com> wrote: > > This Message Is From an External Sender > This message came from outside your organization. > On Fri, Jul 12, 2024 at 2:26 AM Ivan Luthfi <ivanluth...@gmail.com > <mailto:ivanluth...@gmail.com>> wrote: >> This Message Is From an External Sender >> This message came from outside your organization. >> >> I have warning: >> >> FormatFunction.c: In function 'ComputeStiffnessMatrix': >> FormatFunction.c:128:46: warning: '%d' directive writing between 1 and 11 >> bytes into a region of size between 0 and 99 [-Wformat-overflow] >> (line128) sprintf(filename, "%sc%d_N%dM%d_permeability.log", >> up->problem_description, up->problem_flag, up->Nx, up->Mx) >> >> do you know why this warning appear? and how to fix it. > > You are writing a PetscInt into the spot for an int. You can > > 1) Cast to int: > > sprintf(filename, "%sc%d_N%dM%d_permeability.log", up->problem_description, > up->problem_flag, (int)up->Nx, (int)up->Mx) > > 2) Use the custom format > > sprintf(filename, "%sc%d_N%" PetscInt_FMT "M%" PetscInt_FMT > "_permeability.log", up->problem_description, up->problem_flag, up->Nx, > up->Mx) > > Thanks, > > Matt > >> -- >> Best regards, >> -- > > > -- > What most experimenters take for granted before they begin their experiments > is infinitely more interesting than any results to which their experiments > lead. > -- Norbert Wiener > > https://urldefense.us/v3/__https://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!dMw87FGcY2KugOvdL79R4oeCp3123y3KJM7PolI9-vEhud2d9hXWYW_Us21eQGtkLa2GeY8mG9eiTO7R0_03y2w$ > > <https://urldefense.us/v3/__http://www.cse.buffalo.edu/*knepley/__;fg!!G_uCfscf7eWS!YNtOwQCCJYLu6JV0ph8gXnJeFhrQXAiTdZyhV_C0bBut_pZLBhsZw-xORAasjijkRzFe_0udBt4lKX2xYfz0$>
