options_interface.c

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#include <errno.h>
#include <stdlib.h>
#include <stdio.h>

/* Cavillo (non impatta la portabilità. */
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif

#include <string.h>
#include "options.h"

struct option* options_allocate(int n) {
        n += 2; /* better safe than sorry */
        struct option* ops = malloc(sizeof(struct option)*n);
        int i; for(i=0;i<n;i++) {
                ops[i].name = 0;
                ops[i].type = (enum option_type) 0xbeef;
                ops[i].desc = 0;
                ops[i].value_pointer = 0;
                ops[i].set_pointer = 0;
        }
        return ops;
}

/* Find next empty slot in the array. XXX farlo meglio */
struct option* options_next_empty(struct option*ops) {
        int i; for(i=0;;i++) {
                if(ops[i].name == 0)
                 return ops+i;
        }
}

char * strdup_(const char *s);

void options_int(struct option*ops, const char* name, int *p, int def_value, const char*desc) {
        struct option* o =  options_next_empty(ops);
        o->name = strdup_(name);
        o->value_pointer = p;
        o->set_pointer = 0;
        o->desc = strdup_(desc);
        o->type = OPTION_INT;
        *p = def_value;
}

void options_alternative(struct option*ops, const char*name, struct option_alternative* alt,
        int*value, const char*desc) {
        struct option* o =  options_next_empty(ops);
        o->name = strdup_(name);
        o->value_pointer = value;
        o->set_pointer = 0;
        o->desc = strdup_(desc);
        o->type = OPTION_ALTERNATIVE;
        o->alternative = alt;
        *value = alt[0].value;
}


void options_double (struct option*ops, const char* name, double *p, double def_value, const char*desc){
        struct option* o =  options_next_empty(ops);
        o->name = strdup_(name);
        o->value_pointer = p;
        o->set_pointer = 0;
        o->desc = strdup_(desc);
        o->type = OPTION_DOUBLE;
        *p = def_value;
}

void options_string (struct option*ops, const char* name, const char** p,const char*def_value,const char*desc){
        struct option* o =  options_next_empty(ops);
        o->name = strdup_(name);
        o->value_pointer = p;
        o->set_pointer = 0;
        o->desc = strdup_(desc);
        o->type = OPTION_STRING;
        *p = def_value;
}