CODEWITHSUNDEEP
ccompilation
Asam Padeh
Asam Padeh

Reputation: 145

Initialise array inside struct in C

I wants to initialise an array of struct variable, while the struct itself consists of array of bytes

struct my_bytes {
    u8 byte[128];
};

struct my_bytes data[] = {
    { 0x12, 0x34, 0x56, 0x78 },
    { 0x13, 0x35, 0x57, 0x79 },
    { 0x14, 0x36, 0x58, 0x7a },
};

Compile is fine in native gcc 4.8.5 but error in other compiler/environment Is there another way to initialise data?

Error message

it_sram.c:200:3: error: missing braces around initializer [-Werror=missing-braces]
it_sram.c:200:3: error: (near initialization for 'data[0].byte') [-Werror=missing-braces]
it_sram.c:199:18: error: unused variable 'data' [-Werror=unused-variable]
it_sram.c: At top level:
cc1: error: unrecognized command line option "-Wno-misleading-indentation" [-Werror]
cc1: all warnings being treated as errors

Upvotes: 0

Views: 91

Answers (2)

Some programmer dude
Some programmer dude

Reputation: 409176

You need two pairs of curcly braces {}:

struct my_bytes data[] = {
    { { 0x12, 0x34, 0x56, 0x78 } },
    { { 0x13, 0x35, 0x57, 0x79 } },
    { { 0x14, 0x36, 0x58, 0x7a } },
};

The outer is for the structure, the inner for the array.

Upvotes: 2

bruno
bruno

Reputation: 32586

you missed a level of {}

struct my_bytes data[] = {
  {{ 0x12, 0x34, 0x56, 0x78 } },
  {{ 0x13, 0x35, 0x57, 0x79 } },
  {{ 0x14, 0x36, 0x58, 0x7a } },
};

to have that more visible if I change the struct to be :

struct my_bytes {
  u8 byte[128];
  int a;
};

you need something like that :

struct my_bytes data[] = {
  {{ 0x12, 0x34, 0x56, 0x78 }, 1 },
  {{ 0x13, 0x35, 0x57, 0x79 }, 2 },
  {{ 0x14, 0x36, 0x58, 0x7a }, 3 },
};

Upvotes: 2

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