将比较函数写入 qsort 以按指定字段对结构数组进行排序？

Question

I have the following struct:

struct Variant{
    char name[50];
    int age;
    long long int temporal_aura;
    char timeline[50];
    char status;
};

I'll have an array of structs and I want to sort it by any of the fields above (name, age, temporal_aura, timeline, status). The field used to sort the array will be given by the user. For example:

void sort_struct(Variant **variants, int n, char *field){
    if(!strcmp(field,"name"))
        qsort(variants, n, sizeof(Variant), compare);

    if(!strcmp(field,"age"))
        qsort(variants, n, sizeof(Variant), compare);

    if(!strcmp(field,"temporal_aura"))
        qsort(variants, n, sizeof(Variant), compare);

    if(!strcmp(field,"timeline"))
        qsort(variants, n, sizeof(Variant), compare);

    if(!strcmp(field,"status"))
        qsort(variants, n, sizeof(Variant), compare);
}

My problem is: will I have to write a compare function to each member of the struct? Is there any way to optimize a compare function to this code?

Answer 1

will I have to write a compare function to each member of the struct?

Yes.
(Unless you want a dirty "pass info in a global variable" solution).

Research qsort_r() for a qsort() alternative.

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BTW, I would have expected qsort(variants, n, sizeof(Variant*), compare); (note: the * ) or better as qsort(variants, n, sizeof *variants, compare);