How to initialize a structure pointer with another structure pointer inside by C?

Question

I try to initialize a structure pointer with another structure pointer inside by C programming, otherwise i get the segmentation fault. The structure is defined as below:

`struct gfcontext_t{
    char *fileContent;
    size_t fileLength;
    char *response;
    int socket_hd;
};

struct gfserver_t{
    char *serverName;
    int serverPort;
    int maxConnection;
    ssize_t (*handler)(struct gfcontext_t *, char *, void * );
    struct gfcontext_t *ctx;
    int status;
};

The initialization is give inside a function:

gfserver_t * gfserver_create(){
    struct gfserver_t *gfs;
    gfs=(gfserver_t*) malloc(sizeof(struct gfserver_t));
    ......//how to do the initialization?
    return gfs;
}`

Standard Warning : Please do not cast the return value of malloc() and family in C. — Sourav Ghosh
– Sourav Ghosh, Commented Jun 4, 2015 at 13:07
//how to do the initialization?...show existing efforts please — Sourav Ghosh
– Sourav Ghosh, Commented Jun 4, 2015 at 13:08
Standard Warning #2: Please do not use a C++ compiler to compile C code. If you need to use some C code in your C++ project, compile the C code (using a C compiler) as a static or dynamic object file, and then link that object file into your C++ project when you're compiling your C++ code (using a C++ compiler). — autistic
– autistic, Commented Jun 4, 2015 at 13:40
@undefinedbehaviour isn't that a bit overkill, if the code is in the C/C++ subset ? — Quentin
– Quentin, Commented Jun 4, 2015 at 13:44
@undefinedbehaviour Sorry but how did you know OP uses a C++ compiler? — Sourav Ghosh
– Sourav Ghosh, Commented Jun 4, 2015 at 13:48

axxis · Accepted Answer · 2015-06-04 13:41:30Z

1

Use:
gfs->ctx = malloc(sizeof(struct gfcontext_t));
or if you also want to initialize the gfcontext_t members to null
gfs->ctx = calloc(1, sizeof(struct gfcontext_t));

answered Jun 4, 2015 at 13:41

axxis

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2 Comments

JeremyP Over a year ago

Or gfs->ctx = calloc(1, sizeof *gfs->ctx);

axxis Over a year ago

@JeremyP Right, this is even better since you don't have to care about the type of ctx :-)

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