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Macro-sation error

emmalee last edited by
Why isn't this code fragment compiled?
```
#define container_of(ptr, type, field_name) ( \
(type *) ((char *) (ptr) - offsetof(type, field_name)))
```
Makes a mistake.
C:\list.h:37: error: expected expression before ')' token (type *)((char *) (ptr) - offsetof(type, field_name)) ^
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J
jules last edited by
Try this one.
```
#define container_of(field_addr,type,field_name)    \
  ((type *)((char *)field_addr -                    \
            (char *)&((type *)0)->field_name))
```
I'm working.
After the pastebine came up, everything came to the spot.
Both macroes are working, but you have to compil. gcc -std=gnu99 ... No. -std=c99as the operator typeof() is the extension of GNU and is not accepted in C99.
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You should publish the entire code; however, I will give you an example code:int main () { int op; char virusname[50]; printf("Please, select your language\n1. English\n2.Spanish\n"); scanf("%d", &op); if(op == 1) { printf("Por favor dime el nombre de tu virus:\n"); gets(virusName); } else { //código en inglés. } return 0; } That code will have the same problem and that's why the keyboard buffer is dirty. That is, when you ask the user to enter a language, the scanf function will run and leave a line jump (\n) in the buffer. Then when the function gets executed, it will not pause the program because the buffer must be empty. In C we could clean the buffer this way:while((ch = getchar()) != '\n' && ch != EOF); The correct code would be like this:int main () { int op; char virusname[50]; printf("Please, select your language\n1. English\n2.Spanish\n"); scanf("%d", &op); //Limpiamos el búfer stdin después del scanf. while((ch = getchar()) != '\n' && ch != EOF); if(op == 1) { printf("Por favor dime el nombre de tu virus:\n"); gets(virusName); } else { //código en inglés. } return 0; } That way, the function gets now will pause the program and you will have no problem.Now I recommend not to use the gets function to read strings, since it does not allow you to specify the size of the buffer and therefore, a buffer overflow might occur. For example:The size of the arrangement virusname is 50 characters, if the user enters more than 50, the buffer will be overwhelmed (virusname) and this can cause overwriting of memory or make the program crash instantly.A possible solution is to use the function fgets:printf("Por favor dime el nombre de tu virus:\n"); fgets(virusName, sizeof virusname, stdin); Now, in order not to be writing much, you could shorten the code more by using a macro:#define fgets_(str) fgets(str, sizeof str, stdin) Usage mode:printf("Por favor dime el nombre de tu virus:\n"); fgets_(virusName); And so you save yourself from writing sizeof and stdin.
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Macro-sation error

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