options.h

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#ifndef H_OPTIONS
#define H_OPTIONS

#include <stdio.h>

#ifdef __cplusplus
extern "C" {
#endif


        /* Sets the banner for the help message. (pointer is kept) */
        void options_banner(const char*message);

        struct option;
        struct option_alternative;

        struct option* options_allocate(int n);

        void options_int    (struct option*, const char* name,  
                int *p,  int def_value, const char*desc);

        void options_double (struct option*, const char* name,  
                double *p, double def_value, const char*desc);

        void options_string (struct option*, const char* name, 
                const char** p,const char*def_balue,const char*desc);

        void options_alternative(struct option*, const char*name, struct option_alternative*alt,
                int*value, const char*desc);

        int options_parse_args(struct option*ops, int argc, const char* argv[]);

        int options_parse_file(struct option*ops, const char*pwd, const char*file);

        void options_print_help(struct option*ops, FILE*where);


enum option_type { OPTION_STRING=0, OPTION_INT=1, OPTION_DOUBLE=2, OPTION_ALTERNATIVE=3 };
 
#define OPTIONS_NAME_MAXSIZE 32
#define OPTIONS_VALUE_MAXSIZE 256


struct option {
        const char * name;
        const char * desc;

        enum option_type type;
        
        void * value_pointer;


        int * set_pointer;
        
        struct option_alternative * alternative;
};

struct option_alternative { 
        const char *label;
        int value;
        const char *desc;
}; 


struct option * options_find(struct option*ops, const char * name);

int options_requires_argument(struct option*o);

void options_set_passed(struct option*o);

int options_try_pair(struct option*ops, const char*name, const char*value);

int options_set(struct option*op, const char*value);

int options_valid(struct option*op);

void options_dump(struct option * options, FILE*f, int write_desc);

int options_parse_stream(struct option*ops, const char*pwd, FILE*file);

char * strdup_(const char *s);
int get_double(double*p, const char*s);
int get_int(int*p, const char*s);
/* Find next empty slot in the array. XXX farlo meglio */
struct option* options_next_empty(struct option*ops);



#ifdef __cplusplus
}
#endif



#endif