[thirdparty/util-linux.git] / clockB / shhopt.c

/* $Id: shhopt.c,v 2.2 1997/07/06 23:11:55 aebr Exp $ */
/**************************************************************************
 *
 *  FILE            shhopt.c
 *
 *  DESCRIPTION     Functions for parsing command line arguments. Values
 *                  of miscellaneous types may be stored in variables,
 *                  or passed to functions as specified.
 *
 *  REQUIREMENTS    Some systems lack the ANSI C -function strtoul. If your
 *                  system is one of those, you'll ned to write one yourself,
 *                  or get the GNU liberty-library (from prep.ai.mit.edu).
 *
 *  WRITTEN BY      Sverre H. Huseby <sverrehu@ifi.uio.no>
 *
 **************************************************************************/

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include <errno.h>

#include "shhopt.h"

/**************************************************************************
 *                                                                        *
 *                       P R I V A T E    D A T A                         *
 *                                                                        *
 **************************************************************************/

static void optFatalFunc(const char *, ...);
static void (*optFatal)(const char *format, ...) = optFatalFunc;


/**************************************************************************
 *                                                                        *
 *                   P R I V A T E    F U N C T I O N S                   *
 *                                                                        *
 **************************************************************************/

/*-------------------------------------------------------------------------
 *
 *  NAME          optFatalFunc
 *
 *  FUNCTION      Show given message and abort the program.
 *
 *  INPUT         format, ...
 *                        Arguments used as with printf().
 *
 *  RETURNS       Never returns. The program is aborted.
 *
 */
void optFatalFunc(const char *format, ...)
{
    va_list ap;

    fflush(stdout);
    va_start(ap, format);
    vfprintf(stderr, format, ap);
    va_end(ap);
    exit(99);
}


/*-------------------------------------------------------------------------
 *
 *  NAME          optStructCount
 *
 *  FUNCTION      Get number of options in a optStruct.
 *
 *  INPUT         opt     array of possible options.
 *
 *  RETURNS       Number of options in the given array.
 *
 *  DESCRIPTION   Count elements in an optStruct-array. The strcture must
 *                be ended using an element of type OPT_END.
 *
 */
static int optStructCount(const optStruct opt[])
{
    int ret = 0;

    while (opt[ret].type != OPT_END)
        ++ret;
    return ret;
}


/*-------------------------------------------------------------------------
 *
 *  NAME          optMatch
 *
 *  FUNCTION      Find a matching option.
 *
 *  INPUT         opt     array of possible options.
 *                s       string to match, without `-' or `--'.
 *                lng     match long option, otherwise short.
 *
 *  RETURNS       Index to the option if found, -1 if not found.
 *
 *  DESCRIPTION   Short options are matched from the first character in
 *                the given string.
 *
 */
static int optMatch(const optStruct opt[], const char *s, int lng)
{
    int  nopt, q, matchlen = 0;
    char *p;

    nopt = optStructCount(opt);
    if (lng) {
	if ((p = strchr(s, '=')) != NULL)
	    matchlen = p - s;
	else
	    matchlen = strlen(s);
    }
    for (q = 0; q < nopt; q++) {
	if (lng) {
	    if (!opt[q].longName)
		continue;
	    if (strncmp(s, opt[q].longName, matchlen) == 0)
		return q;
	} else {
	    if (!opt[q].shortName)
		continue;
	    if (*s == opt[q].shortName)
		return q;
	}
    }
    return -1;
}


/*-------------------------------------------------------------------------
 *
 *  NAME          optString
 *
 *  FUNCTION      Return a (static) string with the option name.
 *
 *  INPUT         opt     the option to stringify.
 *                lng     is it a long option?
 *
 *  RETURNS       Pointer to static string.
 *
 */
static char *optString(const optStruct *opt, int lng)
{
    static char ret[31];

    if (lng) {
	strcpy(ret, "--");
	strncpy(ret + 2, opt->longName, 28);
    } else {
	ret[0] = '-';
	ret[1] = opt->shortName;
	ret[2] = '\0';
    }
    return ret;
}


/*-------------------------------------------------------------------------
 *
 *  NAME          optNeedsArgument
 *
 *  FUNCTION      Check if an option requires an argument.
 *
 *  INPUT         opt     the option to check.
 *
 *  RETURNS       Boolean value.
 *
 */
static int optNeedsArgument(const optStruct *opt)
{
    return opt->type == OPT_STRING
	|| opt->type == OPT_INT
	|| opt->type == OPT_UINT
	|| opt->type == OPT_LONG
	|| opt->type == OPT_ULONG;
}


/*-------------------------------------------------------------------------
 *
 *  NAME          argvRemove
 *
 *  FUNCTION      Remove an entry from an argv-array.
 *
 *  INPUT         argc    pointer to number of options.
 *                argv    array of option-/argument-strings.
 *                i       index of option to remove.
 *
 *  OUTPUT        argc    new argument count.
 *                argv    array with given argument removed.
 *
 */
static void argvRemove(int *argc, char *argv[], int i)
{
    if (i >= *argc)
        return;
    while (i++ < *argc)
        argv[i - 1] = argv[i];
    --*argc;
}


/*-------------------------------------------------------------------------
 *
 *  NAME          optExecute
 *
 *  FUNCTION      Perform the action of an option.
 *
 *  INPUT         opt     array of possible options.
 *                arg     argument to option, if it applies.
 *                lng     was the option given as a long option?
 *
 *  RETURNS       Nothing. Aborts in case of error.
 *
 */
void optExecute(const optStruct *opt, char *arg, int lng)
{
    switch (opt->type) {
      case OPT_FLAG:
	if (opt->flags & OPT_CALLFUNC)
	    ((void (*)(void)) opt->arg)();
	else
	    *((int *) opt->arg) = 1;
	break;

      case OPT_STRING:
	if (opt->flags & OPT_CALLFUNC)
	    ((void (*)(char *)) opt->arg)(arg);
	else
	    *((char **) opt->arg) = arg;
	break;

      case OPT_INT:
      case OPT_LONG: {
	  long tmp;
	  char *e;
	  
	  tmp = strtol(arg, &e, 10);
	  if (*e)
	      optFatal("invalid number `%s'\n", arg);
	  if (errno == ERANGE
	      || (opt->type == OPT_INT && (tmp > INT_MAX || tmp < INT_MIN)))
	      optFatal("number `%s' to `%s' out of range\n",
		       arg, optString(opt, lng));
	  if (opt->type == OPT_INT) {
	      if (opt->flags & OPT_CALLFUNC)
		  ((void (*)(int)) opt->arg)((int) tmp);
	      else
		  *((int *) opt->arg) = (int) tmp;
	  } else /* OPT_LONG */ {
	      if (opt->flags & OPT_CALLFUNC)
		  ((void (*)(long)) opt->arg)(tmp);
	      else
		  *((long *) opt->arg) = tmp;
	  }
	  break;
      }
	
      case OPT_UINT:
      case OPT_ULONG: {
	  unsigned long tmp;
	  char *e;
	  
	  tmp = strtoul(arg, &e, 10);
	  if (*e)
	      optFatal("invalid number `%s'\n", arg);
	  if (errno == ERANGE
	      || (opt->type == OPT_UINT && tmp > UINT_MAX))
	      optFatal("number `%s' to `%s' out of range\n",
		       arg, optString(opt, lng));
	  if (opt->type == OPT_UINT) {
	      if (opt->flags & OPT_CALLFUNC)
		  ((void (*)(unsigned)) opt->arg)((unsigned) tmp);
	      else
		  *((unsigned *) opt->arg) = (unsigned) tmp;
	  } else /* OPT_ULONG */ {
	      if (opt->flags & OPT_CALLFUNC)
		  ((void (*)(unsigned long)) opt->arg)(tmp);
	      else
		  *((unsigned long *) opt->arg) = tmp;
	  }
	  break;
      }

      default:
	break;
    }
}


/**************************************************************************
 *                                                                        *
 *                    P U B L I C    F U N C T I O N S                    *
 *                                                                        *
 **************************************************************************/

/*-------------------------------------------------------------------------
 *
 *  NAME          optSetFatalFunc
 *
 *  FUNCTION      Set function used to display error message and exit.
 *
 *  SYNOPSIS      #include "shhmsg.h"
 *                void optSetFatalFunc(void (*f)(const char *, ...));
 *
 *  INPUT         f       function accepting printf()'like parameters,
 *                        that _must_ abort the program.
 *
 */
void optSetFatalFunc(void (*f)(const char *, ...))
{
    optFatal = f;
}


/*-------------------------------------------------------------------------
 *
 *  NAME          optParseOptions
 *
 *  FUNCTION      Parse commandline options.
 *
 *  SYNOPSIS      #include "shhopt.h"
 *                void optParseOptions(int *argc, char *argv[],
 *                                     const optStruct opt[], int allowNegNum);
 *
 *  INPUT         argc    Pointer to number of options.
 *                argv    Array of option-/argument-strings.
 *                opt     Array of possible options.
 *                allowNegNum
 *                        a negative number is not to be taken as
 *                        an option.
 *
 *  OUTPUT        argc    new argument count.
 *                argv    array with arguments removed.
 *
 *  RETURNS       Nothing. Aborts in case of error.
 *
 *  DESCRIPTION   This function checks each option in the argv-array
 *                against strings in the opt-array, and `executes' any
 *                matching action. Any arguments to the options are
 *                extracted and stored in the variables or passed to
 *                functions pointed to by entries in opt.
 *
 *                Options and arguments used are removed from the argv-
 *                array, and argc is decreased accordingly.
 *
 *                Any error leads to program abortion.
 *
 */
void optParseOptions(int *argc, char *argv[],
		     const optStruct opt[], int allowNegNum)
{
    int  ai,        /* argv index. */
         optarg,    /* argv index of option argument, or -1 if none. */
         mi,        /* Match index in opt. */
         done;
    char *arg,      /* Pointer to argument to an option. */
         *o,        /* pointer to an option character */
         *p;

    /*
     *  Loop through all arguments.
     */
    for (ai = 0; ai < *argc; ) {
	/*
	 *  "--" indicates that the rest of the argv-array does not
	 *  contain options.
	 */
	if (strcmp(argv[ai], "--") == 0) {
            argvRemove(argc, argv, ai);
	    break;
	}

	if (allowNegNum && argv[ai][0] == '-' && isdigit(argv[ai][1])) {
	    ++ai;
	    continue;
	} else if (strncmp(argv[ai], "--", 2) == 0) {
	    /* long option */
	    /* find matching option */
	    if ((mi = optMatch(opt, argv[ai] + 2, 1)) < 0)
		optFatal("unrecognized option `%s'\n", argv[ai]);

	    /* possibly locate the argument to this option. */
	    arg = NULL;
	    if ((p = strchr(argv[ai], '=')) != NULL)
		arg = p + 1;
	    
	    /* does this option take an argument? */
	    optarg = -1;
	    if (optNeedsArgument(&opt[mi])) {
		/* option needs an argument. find it. */
		if (!arg) {
		    if ((optarg = ai + 1) == *argc)
			optFatal("option `%s' requires an argument\n",
				 optString(&opt[mi], 1));
		    arg = argv[optarg];
		}
	    } else {
		if (arg)
		    optFatal("option `%s' doesn't allow an argument\n",
			     optString(&opt[mi], 1));
	    }
	    /* perform the action of this option. */
	    optExecute(&opt[mi], arg, 1);
	    /* remove option and any argument from the argv-array. */
            if (optarg >= 0)
                argvRemove(argc, argv, ai);
            argvRemove(argc, argv, ai);
	} else if (*argv[ai] == '-') {
	    /* A dash by itself is not considered an option. */
	    if (argv[ai][1] == '\0') {
		++ai;
		continue;
	    }
	    /* Short option(s) following */
	    o = argv[ai] + 1;
	    done = 0;
	    optarg = -1;
	    while (*o && !done) {
		/* find matching option */
		if ((mi = optMatch(opt, o, 0)) < 0)
		    optFatal("unrecognized option `-%c'\n", *o);

		/* does this option take an argument? */
		optarg = -1;
		arg = NULL;
		if (optNeedsArgument(&opt[mi])) {
		    /* option needs an argument. find it. */
		    arg = o + 1;
		    if (!*arg) {
			if ((optarg = ai + 1) == *argc)
			    optFatal("option `%s' requires an argument\n",
				     optString(&opt[mi], 0));
			arg = argv[optarg];
		    }
		    done = 1;
		}
		/* perform the action of this option. */
		optExecute(&opt[mi], arg, 0);
		++o;
	    }
	    /* remove option and any argument from the argv-array. */
            if (optarg >= 0)
                argvRemove(argc, argv, ai);
            argvRemove(argc, argv, ai);
	} else {
	    /* a non-option argument */
	    ++ai;
	}
    }
}
Commit	Line	Data
fd6b7a7f KZ	1	/* $Id: shhopt.c,v 2.2 1997/07/06 23:11:55 aebr Exp $ */
	2	/**************************************************************************
	3	*
	4	* FILE shhopt.c
	5	*
	6	* DESCRIPTION Functions for parsing command line arguments. Values
	7	* of miscellaneous types may be stored in variables,
	8	* or passed to functions as specified.
	9	*
	10	* REQUIREMENTS Some systems lack the ANSI C -function strtoul. If your
	11	* system is one of those, you'll ned to write one yourself,
	12	* or get the GNU liberty-library (from prep.ai.mit.edu).
	13	*
	14	* WRITTEN BY Sverre H. Huseby <sverrehu@ifi.uio.no>
	15	*
	16	**************************************************************************/
	17
	18	#include <stdio.h>
	19	#include <stdlib.h>
	20	#include <stdarg.h>
	21	#include <string.h>
	22	#include <ctype.h>
	23	#include <limits.h>
	24	#include <errno.h>
	25
	26	#include "shhopt.h"
	27
	28	/**************************************************************************
	29	* *
	30	* P R I V A T E D A T A *
	31	* *
	32	**************************************************************************/
	33
	34	static void optFatalFunc(const char *, ...);
	35	static void (optFatal)(const char format, ...) = optFatalFunc;
	36
	37
	38
	39	/**************************************************************************
	40	* *
	41	* P R I V A T E F U N C T I O N S *
	42	* *
	43	**************************************************************************/
	44
	45	/*-------------------------------------------------------------------------
	46	*
	47	* NAME optFatalFunc
	48	*
	49	* FUNCTION Show given message and abort the program.
	50	*
	51	* INPUT format, ...
	52	* Arguments used as with printf().
	53	*
	54	* RETURNS Never returns. The program is aborted.
	55	*
	56	*/
	57	void optFatalFunc(const char *format, ...)
	58	{
	59	va_list ap;
	60
	61	fflush(stdout);
	62	va_start(ap, format);
	63	vfprintf(stderr, format, ap);
	64	va_end(ap);
65	exit(99);
66	}
67
68
69
70	/*-------------------------------------------------------------------------
71	*
72	* NAME optStructCount
73	*
74	* FUNCTION Get number of options in a optStruct.
75	*
76	* INPUT opt array of possible options.
77	*
78	* RETURNS Number of options in the given array.
79	*
80	* DESCRIPTION Count elements in an optStruct-array. The strcture must
81	* be ended using an element of type OPT_END.
82	*
83	*/
84	static int optStructCount(const optStruct opt[])
85	{
86	int ret = 0;
87
88	while (opt[ret].type != OPT_END)
89	++ret;
90	return ret;
91	}
92
93
94
95	/*-------------------------------------------------------------------------
96	*
97	* NAME optMatch
98	*
99	* FUNCTION Find a matching option.
100	*
101	* INPUT opt array of possible options.
102	* s string to match, without `-' or `--'.
103	* lng match long option, otherwise short.
104	*
105	* RETURNS Index to the option if found, -1 if not found.
106	*
107	* DESCRIPTION Short options are matched from the first character in
108	* the given string.
109	*
110	*/
111	static int optMatch(const optStruct opt[], const char *s, int lng)
112	{
113	int nopt, q, matchlen = 0;
114	char *p;
115
116	nopt = optStructCount(opt);
117	if (lng) {
118	if ((p = strchr(s, '=')) != NULL)
119	matchlen = p - s;
120	else
121	matchlen = strlen(s);
122	}
123	for (q = 0; q < nopt; q++) {
124	if (lng) {
125	if (!opt[q].longName)
126	continue;
127	if (strncmp(s, opt[q].longName, matchlen) == 0)
128	return q;
129	} else {
130	if (!opt[q].shortName)
131	continue;
132	if (*s == opt[q].shortName)
133	return q;
134	}
135	}
136	return -1;
137	}
138
139
140
141	/*-------------------------------------------------------------------------
142	*
143	* NAME optString
144	*
145	* FUNCTION Return a (static) string with the option name.
146	*
147	* INPUT opt the option to stringify.
148	* lng is it a long option?
149	*
150	* RETURNS Pointer to static string.
151	*
152	*/
153	static char optString(const optStruct opt, int lng)
154	{
155	static char ret[31];
156
157	if (lng) {
158	strcpy(ret, "--");
159	strncpy(ret + 2, opt->longName, 28);
160	} else {
161	ret[0] = '-';
162	ret[1] = opt->shortName;
163	ret[2] = '\0';
164	}
165	return ret;
166	}
167
168
169
170	/*-------------------------------------------------------------------------
171	*
172	* NAME optNeedsArgument
173	*
174	* FUNCTION Check if an option requires an argument.
175	*
176	* INPUT opt the option to check.
177	*
178	* RETURNS Boolean value.
179	*
180	*/
181	static int optNeedsArgument(const optStruct *opt)
182	{
183	return opt->type == OPT_STRING
184	\|\| opt->type == OPT_INT
185	\|\| opt->type == OPT_UINT
186	\|\| opt->type == OPT_LONG
187	\|\| opt->type == OPT_ULONG;
188	}
189
190
191
192	/*-------------------------------------------------------------------------
193	*
194	* NAME argvRemove
195	*
196	* FUNCTION Remove an entry from an argv-array.
197	*
198	* INPUT argc pointer to number of options.
199	* argv array of option-/argument-strings.
200	* i index of option to remove.
201	*
202	* OUTPUT argc new argument count.
203	* argv array with given argument removed.
204	*
205	*/
206	static void argvRemove(int argc, char argv[], int i)
207	{
208	if (i >= *argc)
209	return;
210	while (i++ < *argc)
211	argv[i - 1] = argv[i];
212	--*argc;
213	}
214
215
216
217	/*-------------------------------------------------------------------------
218	*
219	* NAME optExecute
220	*
221	* FUNCTION Perform the action of an option.
222	*
223	* INPUT opt array of possible options.
224	* arg argument to option, if it applies.
225	* lng was the option given as a long option?
226	*
227	* RETURNS Nothing. Aborts in case of error.
228	*
229	*/
230	void optExecute(const optStruct opt, char arg, int lng)
231	{
232	switch (opt->type) {
233	case OPT_FLAG:
234	if (opt->flags & OPT_CALLFUNC)
235	((void (*)(void)) opt->arg)();
236	else
237	((int ) opt->arg) = 1;
238	break;
239
240	case OPT_STRING:
241	if (opt->flags & OPT_CALLFUNC)
242	((void ()(char )) opt->arg)(arg);
243	else
244	((char *) opt->arg) = arg;
245	break;
246
247	case OPT_INT:
248	case OPT_LONG: {
249	long tmp;
250	char *e;
251
252	tmp = strtol(arg, &e, 10);
253	if (*e)
254	optFatal("invalid number `%s'\n", arg);
255	if (errno == ERANGE
256	\|\| (opt->type == OPT_INT && (tmp > INT_MAX \|\| tmp < INT_MIN)))
257	optFatal("number `%s' to `%s' out of range\n",
258	arg, optString(opt, lng));
259	if (opt->type == OPT_INT) {
260	if (opt->flags & OPT_CALLFUNC)
261	((void (*)(int)) opt->arg)((int) tmp);
262	else
263	((int ) opt->arg) = (int) tmp;
264	} else /* OPT_LONG */ {
265	if (opt->flags & OPT_CALLFUNC)
266	((void (*)(long)) opt->arg)(tmp);
267	else
268	((long ) opt->arg) = tmp;
269	}
270	break;
271	}
272
273	case OPT_UINT:
274	case OPT_ULONG: {
275	unsigned long tmp;
276	char *e;
277
278	tmp = strtoul(arg, &e, 10);
279	if (*e)
280	optFatal("invalid number `%s'\n", arg);
281	if (errno == ERANGE
282	\|\| (opt->type == OPT_UINT && tmp > UINT_MAX))
283	optFatal("number `%s' to `%s' out of range\n",
284	arg, optString(opt, lng));
285	if (opt->type == OPT_UINT) {
286	if (opt->flags & OPT_CALLFUNC)
287	((void (*)(unsigned)) opt->arg)((unsigned) tmp);
288	else
289	((unsigned ) opt->arg) = (unsigned) tmp;
290	} else /* OPT_ULONG */ {
291	if (opt->flags & OPT_CALLFUNC)
292	((void (*)(unsigned long)) opt->arg)(tmp);
293	else
294	((unsigned long ) opt->arg) = tmp;
295	}
296	break;
297	}
298
299	default:
300	break;
301	}
302	}
303
304
305
306	/**************************************************************************
307	* *
308	* P U B L I C F U N C T I O N S *
309	* *
310	**************************************************************************/
311
312	/*-------------------------------------------------------------------------
313	*
314	* NAME optSetFatalFunc
315	*
316	* FUNCTION Set function used to display error message and exit.
317	*
318	* SYNOPSIS #include "shhmsg.h"
319	* void optSetFatalFunc(void (f)(const char , ...));
320	*
321	* INPUT f function accepting printf()'like parameters,
322	* that _must_ abort the program.
323	*
324	*/
325	void optSetFatalFunc(void (f)(const char , ...))
326	{
327	optFatal = f;
328	}
329
330
331
332	/*-------------------------------------------------------------------------
333	*
334	* NAME optParseOptions
335	*
336	* FUNCTION Parse commandline options.
337	*
338	* SYNOPSIS #include "shhopt.h"
339	* void optParseOptions(int argc, char argv[],
340	* const optStruct opt[], int allowNegNum);
341	*
342	* INPUT argc Pointer to number of options.
343	* argv Array of option-/argument-strings.
344	* opt Array of possible options.
345	* allowNegNum
346	* a negative number is not to be taken as
347	* an option.
348	*
349	* OUTPUT argc new argument count.
350	* argv array with arguments removed.
351	*
352	* RETURNS Nothing. Aborts in case of error.
353	*
354	* DESCRIPTION This function checks each option in the argv-array
355	* against strings in the opt-array, and `executes' any
356	* matching action. Any arguments to the options are
357	* extracted and stored in the variables or passed to
358	* functions pointed to by entries in opt.
359	*
360	* Options and arguments used are removed from the argv-
361	* array, and argc is decreased accordingly.
362	*
363	* Any error leads to program abortion.
364	*
365	*/
366	void optParseOptions(int argc, char argv[],
367	const optStruct opt[], int allowNegNum)
368	{
369	int ai, /* argv index. */
370	optarg, /* argv index of option argument, or -1 if none. */
371	mi, /* Match index in opt. */
372	done;
373	char arg, / Pointer to argument to an option. */
374	o, / pointer to an option character */
375	*p;
376
377	/*
378	* Loop through all arguments.
379	*/
380	for (ai = 0; ai < *argc; ) {
381	/*
382	* "--" indicates that the rest of the argv-array does not
383	* contain options.
384	*/
385	if (strcmp(argv[ai], "--") == 0) {
386	argvRemove(argc, argv, ai);
387	break;
388	}
389
390	if (allowNegNum && argv[ai][0] == '-' && isdigit(argv[ai][1])) {
391	++ai;
392	continue;
393	} else if (strncmp(argv[ai], "--", 2) == 0) {
394	/* long option */
395	/* find matching option */
396	if ((mi = optMatch(opt, argv[ai] + 2, 1)) < 0)
397	optFatal("unrecognized option `%s'\n", argv[ai]);
398
399	/* possibly locate the argument to this option. */
400	arg = NULL;
401	if ((p = strchr(argv[ai], '=')) != NULL)
402	arg = p + 1;
403
404	/* does this option take an argument? */
405	optarg = -1;
406	if (optNeedsArgument(&opt[mi])) {
407	/* option needs an argument. find it. */
408	if (!arg) {
409	if ((optarg = ai + 1) == *argc)
410	optFatal("option `%s' requires an argument\n",
411	optString(&opt[mi], 1));
412	arg = argv[optarg];
413	}
414	} else {
415	if (arg)
416	optFatal("option `%s' doesn't allow an argument\n",
417	optString(&opt[mi], 1));
418	}
419	/* perform the action of this option. */
420	optExecute(&opt[mi], arg, 1);
421	/* remove option and any argument from the argv-array. */
422	if (optarg >= 0)
423	argvRemove(argc, argv, ai);
424	argvRemove(argc, argv, ai);
425	} else if (*argv[ai] == '-') {
426	/* A dash by itself is not considered an option. */
427	if (argv[ai][1] == '\0') {
428	++ai;
429	continue;
430	}
431	/* Short option(s) following */
432	o = argv[ai] + 1;
433	done = 0;
434	optarg = -1;
435	while (*o && !done) {
436	/* find matching option */
437	if ((mi = optMatch(opt, o, 0)) < 0)
438	optFatal("unrecognized option `-%c'\n", *o);
439
440	/* does this option take an argument? */
441	optarg = -1;
442	arg = NULL;
443	if (optNeedsArgument(&opt[mi])) {
444	/* option needs an argument. find it. */
445	arg = o + 1;
446	if (!*arg) {
447	if ((optarg = ai + 1) == *argc)
448	optFatal("option `%s' requires an argument\n",
449	optString(&opt[mi], 0));
450	arg = argv[optarg];
451	}
452	done = 1;
453	}
454	/* perform the action of this option. */
455	optExecute(&opt[mi], arg, 0);
456	++o;
457	}
458	/* remove option and any argument from the argv-array. */
459	if (optarg >= 0)
460	argvRemove(argc, argv, ai);
461	argvRemove(argc, argv, ai);
462	} else {
463	/* a non-option argument */
464	++ai;
465	}
466	}
467	}