* where "type" is the type of the @arg argument. The first argument to the
* @cb is the argument found on the commandline.
*
- * Similarly, if @show is not NULL, it should be of type "void show(char *,
- * size_t len, const type *)". It should write up to len bytes into the first
- * argument; unless it uses the entire len bytes it should nul-terminate that
+ * Similarly, if @show is not NULL, it should be of type "bool show(char *,
+ * size_t len, const type *)". If there is no default, it should return false,
+ * otherwise it should write up to len bytes into the first argument and
+ * return true; unless it uses the entire len bytes it should nul-terminate that
* buffer.
*
* Any number of equivalent short or long options can be listed in @names,
char *opt_set_bool(bool *b);
/* Sets @b based on arg: (yes/no/true/false). */
char *opt_set_bool_arg(const char *arg, bool *b);
-void opt_show_bool(char *buf, size_t len, const bool *b);
+bool opt_show_bool(char *buf, size_t len, const bool *b);
/* The inverse */
char *opt_set_invbool(bool *b);
-void opt_show_invbool(char *buf, size_t len, const bool *b);
+bool opt_show_invbool(char *buf, size_t len, const bool *b);
/* Sets @b based on !arg: (yes/no/true/false). */
char *opt_set_invbool_arg(const char *arg, bool *b);
/* Set a char *. */
char *opt_set_charp(const char *arg, char **p);
-void opt_show_charp(char *buf, size_t len, char *const *p);
+/* If *p is NULL, this returns false (i.e. doesn't show a default) */
+bool opt_show_charp(char *buf, size_t len, char *const *p);
/* Set an integer value, various forms. Sets to 1 on arg == NULL. */
char *opt_set_intval(const char *arg, int *i);
-void opt_show_intval(char *buf, size_t len, const int *i);
+bool opt_show_intval(char *buf, size_t len, const int *i);
char *opt_set_uintval(const char *arg, unsigned int *ui);
-void opt_show_uintval(char *buf, size_t len, const unsigned int *ui);
+bool opt_show_uintval(char *buf, size_t len, const unsigned int *ui);
char *opt_set_longval(const char *arg, long *l);
-void opt_show_longval(char *buf, size_t len, const long *l);
+bool opt_show_longval(char *buf, size_t len, const long *l);
char *opt_set_ulongval(const char *arg, unsigned long *ul);
-void opt_show_ulongval(char *buf, size_t len, const unsigned long *ul);
+bool opt_show_ulongval(char *buf, size_t len, const unsigned long *ul);
/* Set an floating point value, various forms. */
char *opt_set_floatval(const char *arg, float *f);
-void opt_show_floatval(char *buf, size_t len, const float *f);
+bool opt_show_floatval(char *buf, size_t len, const float *f);
char *opt_set_doubleval(const char *arg, double *d);
-void opt_show_doubleval(char *buf, size_t len, const double *d);
+bool opt_show_doubleval(char *buf, size_t len, const double *d);
/* the following setting functions accept k, M, G, T, P, or E suffixes, which
multiplies the numeric value by the corresponding power of 1000 or 1024
char *opt_set_ulonglongval_si(const char *arg, unsigned long long *ll);
-void opt_show_intval_bi(char *buf, size_t len, const int *x);
-void opt_show_longval_bi(char *buf, size_t len, const long *x);
-void opt_show_longlongval_bi(char *buf, size_t len, const long long *x);
-void opt_show_uintval_bi(char *buf, size_t len, const unsigned int *x);
-void opt_show_ulongval_bi(char *buf, size_t len, const unsigned long *x);
-void opt_show_ulonglongval_bi(char *buf, size_t len, const unsigned long long *x);
+bool opt_show_intval_bi(char *buf, size_t len, const int *x);
+bool opt_show_longval_bi(char *buf, size_t len, const long *x);
+bool opt_show_longlongval_bi(char *buf, size_t len, const long long *x);
+bool opt_show_uintval_bi(char *buf, size_t len, const unsigned int *x);
+bool opt_show_ulongval_bi(char *buf, size_t len, const unsigned long *x);
+bool opt_show_ulonglongval_bi(char *buf, size_t len, const unsigned long long *x);
-void opt_show_intval_si(char *buf, size_t len, const int *x);
-void opt_show_longval_si(char *buf, size_t len, const long *x);
-void opt_show_longlongval_si(char *buf, size_t len, const long long *x);
-void opt_show_uintval_si(char *buf, size_t len, const unsigned int *x);
-void opt_show_ulongval_si(char *buf, size_t len, const unsigned long *x);
-void opt_show_ulonglongval_si(char *buf, size_t len, const unsigned long long *x);
+bool opt_show_intval_si(char *buf, size_t len, const int *x);
+bool opt_show_longval_si(char *buf, size_t len, const long *x);
+bool opt_show_longlongval_si(char *buf, size_t len, const long long *x);
+bool opt_show_uintval_si(char *buf, size_t len, const unsigned int *x);
+bool opt_show_ulongval_si(char *buf, size_t len, const unsigned long *x);
+bool opt_show_ulonglongval_si(char *buf, size_t len, const unsigned long long *x);
enum opt_type type;
char *(*cb)(void *arg); /* OPT_NOARG */
char *(*cb_arg)(const char *optarg, void *arg); /* OPT_HASARG */
- void (*show)(char *buf, size_t len, const void *arg);
+ bool (*show)(char *buf, size_t len, const void *arg);
union {
const void *carg;
void *arg;
char *(*)(const char *, const typeof(*(arg))*), \
char *(*)(const char *, const void *), \
(cb)), \
- typesafe_cb_cast(void (*)(char *buf, size_t, const void *), \
- void (*)(char *buf, size_t, const typeof(*(arg))*), (show))
+ typesafe_cb_cast(bool (*)(char *buf, size_t, const void *), \
+ bool (*)(char *buf, size_t, const typeof(*(arg))*), (show))
/* Non-typesafe register function. */
void _opt_register(const char *names, enum opt_type type,
char *(*cb)(void *arg),
char *(*cb_arg)(const char *optarg, void *arg),
- void (*show)(char *buf, size_t len, const void *arg),
+ bool (*show)(char *buf, size_t len, const void *arg),
const void *arg, const char *desc);
/* We use this to get typechecking for OPT_SUBTABLE */