425 png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,  in png_create_write_struct()  argument
429    return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,  in png_create_write_struct()
435 png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,  in png_create_write_struct_2()  argument
496      if(user_png_ver[i] != png_libpng_ver[i])  in png_create_write_struct_2()
507      if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||  in png_create_write_struct_2()
508          (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||  in png_create_write_struct_2()
509          (user_png_ver[0] == '0' && user_png_ver[2] < '9'))  in png_create_write_struct_2()
513         if (user_png_ver)  in png_create_write_struct_2()
517              user_png_ver);  in png_create_write_struct_2()
574 png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,  in png_write_init_2()  argument
585       if (user_png_ver)  in png_write_init_2()
589            user_png_ver);  in png_write_init_2()
616    png_write_init_3(&png_ptr, user_png_ver, png_struct_size);  in png_write_init_2()
622 png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,  in png_write_init_3()  argument
637      if (user_png_ver[i] != png_libpng_ver[i])  in png_write_init_3()