struct producing errors in C

Question

I am getting strange compilation errors from trying to create a struct in C.

Here is my code:

#define ALIGNMENT 8

/* rounds up to the nearest multiple of ALIGNMENT */
#define ALIGN(size) (((size) + (ALIGNMENT-1)) & ~0x7)

#define SIZE_T_SIZE (ALIGN(sizeof(size_t)))

#define BLK_HDR_SIZE ALIGN(sizeof(blockHdr))


typdef struct header {
    size_t size;
    blockHdr *next_p;
    blockHdr *prior_p;
} blockHdr;

This is the error message:

 mm.c:49:8: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘struct’
 typdef struct header {
        ^
make: *** [mm.o] Error 1

I am baffled by this error. Is there something wrong with my code, or is there a more serious issue?

Look at the order of your typedef declaration and your variable declaration. You also have a typo in typdef — Ed Swangren
– Ed Swangren, Commented Nov 14, 2014 at 5:22
typdef? Is it a typo in this question or in your original code? — Yu Hao
– Yu Hao, Commented Nov 14, 2014 at 5:23
I sat there and stared at this for half an hour and dug into various places. — mrQWERTY
– mrQWERTY, Commented Nov 14, 2014 at 5:24

Ed Swangren · Accepted Answer · 2014-11-14 05:49:17Z

3

You have a typo in typdef. Next, you'll get an error about blockHdr not being defined.

The correct definition is:

typedef struct header {
    size_t size;
    struct header *next_p;
    struct header *prior_p;
} blockHdr;

You can't use the typedef before it is declared. You have to use the actual structure name.

edited Nov 14, 2014 at 5:49

answered Nov 14, 2014 at 5:24

Ed Swangren

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Comments

Achyuta Aich · Accepted Answer · 2014-11-14 05:24:22Z

1

I think that that instead of

typdef struct header

it should be

typedef struct header

answered Nov 14, 2014 at 5:24

Achyuta Aich

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1 Comment

Ed Swangren Over a year ago

He's going to have another problem after that

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