Dynamic Code in C

Question

I have the following codeblock I'm using for German verb drills:

if (strcmp(*option, "sein") == 0)
    *option = linie.sein;

if (strcmp(*option, "haben") == 0)
    *option = linie.haben;

if (strcmp(*option, "possessiv") == 0)
    *option = linie.possessiv;

if (strcmp(*option, "reflexiv") == 0)
    *option = linie.reflexiv;

if (strcmp(*option, "accusativ") == 0)
    *option = linie.accusativ;

if (strcmp(*option, "dativ") == 0)
    *option = linie.dativ;

However I would like to condense it to something like:

*option = linie.(*option);

Or perhaps:

*option = linie.(*option)();

Unfortunately neither of these work. Any ideas?

Edit @dasblinkenlight:

typedef struct
{
    char subjekt[20];
    char sein[20];
    char haben[20];
    char possessiv[20];
    char reflexiv[20];
    char accusativ[20];
    char dativ[20];
} satz;

satz linie =
{
    .subjekt = "",
    .sein = "",
    .haben = "",
    .possessiv = "",
    .reflexiv = "",
    .accusativ = "",
    .dativ = ""
};

char *option = argv[1];

Answer 1

Kirilenko's answer is a good one and works well for short structures like yours. However, for longer structures, maintaining all of the strcmp calls can be cumbersome. To solve this, you can define a relationship between the keyword you are trying to match and the offset of the corresponding element in your structure.

struct relation
{
    char keyword[20];
    int offset;
};

Then you can use the offsetof macro (in stddef.h) to link the keyword to its position in your structure.

#define REL_LEN (7)

struct relation rel[REL_LEN] = {
    {"subjekt", offsetof(satz, subjekt) },
    {"sein", offsetof(satz, sein) },
    {"haben", offsetof(satz, haben) },
    {"possessiv", offsetof(satz, possessiv) },
    {"reflexiv", offsetof(satz, reflexiv) },
    {"accusativ", offsetof(satz, accusativ) },
    {"dativ", offsetof(satz, dativ) }
};

Finally, the function to retrieve your character string using the mapping above could look something like this.

char *lookup_keyword(const satz *linie, const char *option, 
                     const struct relation *rel, size_t rel_size)
{
    int i;
    char *pchar = (char *)linie;

    for (i=0; i<rel_size; i++)
    {
        if (strcmp(option, rel->keyword) == 0)
        {
            pchar += rel->offset;
            return pchar;
        }
        rel++;
    }
    printf("Error: no mapping found matching %s!\n", option);
    return "";
}

And you can invoke it like so

char *option = argv[1];

printf("Result for %s: %s\n", option, 
       lookup_keyword(&linie, option, rel, REL_LEN));