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/*
* No copyright is claimed. This code is in the public domain; do with
* it what you wish.
*/
#ifndef UTIL_LINUX_OPTUTILS_H
#define UTIL_LINUX_OPTUTILS_H
#include <assert.h>
#include "c.h"
#include "nls.h"
#include "cctype.h"
/*
* Converts the short option @c to the corresponding long option from @opts, or
* returns NULL.
*/
static inline const char *ul_get_longopt(const struct option *opts, int c)
{
const struct option *o;
assert(!(opts == NULL));
for (o = opts; o->name; o++)
if (o->val == c)
return o->name;
return NULL;
}
/*
* Converts the short options @c to "%c" or "0x<hex>" if not printable.
*/
static inline const char *ul_get_shortopt(char *buf, size_t bufsz, int c)
{
if (c_isgraph(c))
snprintf(buf, bufsz, "%c", c);
else
snprintf(buf, bufsz, "<0x%02x>", c); /* should not happen */
return buf;
}
#ifndef OPTUTILS_EXIT_CODE
# define OPTUTILS_EXIT_CODE EXIT_FAILURE
#endif
/*
* Check collisions between options.
*
* The conflicts between options are described in ul_excl_t array. The
* array contains groups of mutually exclusive options. For example
*
* static const ul_excl_t excl[] = {
* { 'Z','b','c' }, // first group
* { 'b','x' }, // second group
* { 0 }
* };
*
* int excl_st[ARRAY_SIZE(excl)] = UL_EXCL_STATUS_INIT;
*
* while ((c = getopt_long(argc, argv, "Zbcx", longopts, NULL)) != -1) {
*
* err_exclusive_options(c, longopts, excl, excl_st);
*
* switch (c) {
* case 'Z':
* ....
* }
* }
*
* The array excl[] defines two groups of the mutually exclusive options. The
* option '-b' is in the both groups.
*
* Note that the options in the group have to be in ASCII order (ABC..abc..) and
* groups have to be also in ASCII order.
*
* The maximal number of the options in the group is 15 (size of the array is
* 16, last is zero).
*
* The current status of options is stored in excl_st array. The size of the array
* must be the same as number of the groups in the ul_excl_t array.
*
* If you're unsure then see sys-utils/mount.c or misc-utils/findmnt.c.
*/
#define UL_EXCL_STATUS_INIT { 0 }
typedef int ul_excl_t[16];
static inline void err_exclusive_options(
int c,
const struct option *opts,
const ul_excl_t *excl,
int *status)
{
int e;
for (e = 0; excl[e][0] && excl[e][0] <= c; e++) {
const int *op = excl[e];
for (; *op && *op <= c; op++) {
if (*op != c)
continue;
if (status[e] == 0)
status[e] = c;
else if (status[e] != c) {
const char *a = ul_get_longopt(opts, status[e]);
const char *b = ul_get_longopt(opts, c);
char buf[16]; /* short option in hex */
errx(OPTUTILS_EXIT_CODE,
_("options %s%s and %s%s cannot be combined"),
a ? "--" : "-",
a ? a : ul_get_shortopt(buf, sizeof(buf), status[e]),
b ? "--" : "-",
b ? b : ul_get_shortopt(buf, sizeof(buf), c));
}
break;
}
}
}
#endif
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