aboutsummaryrefslogtreecommitdiff
path: root/util-linux/getopt.c
blob: 74e7235eafa5a94ffc71d41c1aa572daf95c0f5f (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
/* vi: set sw=4 ts=4: */
/*
 * getopt.c - Enhanced implementation of BSD getopt(1)
 *   Copyright (c) 1997, 1998, 1999, 2000  Frodo Looijaard <frodol@dds.nl>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

/*
 * Version 1.0-b4: Tue Sep 23 1997. First public release.
 * Version 1.0: Wed Nov 19 1997.
 *   Bumped up the version number to 1.0
 *   Fixed minor typo (CSH instead of TCSH)
 * Version 1.0.1: Tue Jun 3 1998
 *   Fixed sizeof instead of strlen bug
 *   Bumped up the version number to 1.0.1
 * Version 1.0.2: Thu Jun 11 1998 (not present)
 *   Fixed gcc-2.8.1 warnings
 *   Fixed --version/-V option (not present)
 * Version 1.0.5: Tue Jun 22 1999
 *   Make -u option work (not present)
 * Version 1.0.6: Tue Jun 27 2000
 *   No important changes
 * Version 1.1.0: Tue Jun 30 2000
 *   Added NLS support (partly written by Arkadiusz Mi<B6>kiewicz
 *     <misiek@misiek.eu.org>)
 * Ported to Busybox - Alfred M. Szmidt <ams@trillian.itslinux.org>
 *  Removed --version/-V and --help/-h in
 *  Removed parse_error(), using bb_error_msg() from Busybox instead
 *  Replaced our_malloc with xmalloc and our_realloc with xrealloc
 *
 */

#include "busybox.h"
#include <getopt.h>

/* NON_OPT is the code that is returned when a non-option is found in '+'
   mode */
enum {
	NON_OPT = 1,
/* LONG_OPT is the code that is returned when a long option is found. */
	LONG_OPT = 2
};

/* The shells recognized. */
typedef enum {BASH,TCSH} shell_t;


/* Some global variables that tells us how to parse. */
static shell_t shell=BASH; /* The shell we generate output for. */
static int quiet_errors; /* 0 is not quiet. */
static int quiet_output; /* 0 is not quiet. */
static int quote=1; /* 1 is do quote. */
static int alternative; /* 0 is getopt_long, 1 is getopt_long_only */

/* Function prototypes */
static const char *normalize(const char *arg);
static int generate_output(char **argv,int argc,const char *optstr,
		const struct option *longopts);
static void add_long_options(char *options);
static void add_longopt(const char *name,int has_arg);
static void set_shell(const char *new_shell);


/*
 * This function 'normalizes' a single argument: it puts single quotes around
 * it and escapes other special characters. If quote is false, it just
 * returns its argument.
 * Bash only needs special treatment for single quotes; tcsh also recognizes
 * exclamation marks within single quotes, and nukes whitespace.
 * This function returns a pointer to a buffer that is overwritten by
 * each call.
 */
const char *normalize(const char *arg)
{
	static char *BUFFER=NULL;
	const char *argptr=arg;
	char *bufptr;

	free(BUFFER);

	if (!quote) { /* Just copy arg */
		BUFFER=xstrdup(arg);
		return BUFFER;
	}

	/* Each character in arg may take up to four characters in the result:
	   For a quote we need a closing quote, a backslash, a quote and an
	   opening quote! We need also the global opening and closing quote,
	   and one extra character for '\0'. */
	BUFFER=xmalloc(strlen(arg)*4+3);

	bufptr=BUFFER;
	*bufptr++='\'';

	while (*argptr) {
		if (*argptr == '\'') {
			/* Quote: replace it with: '\'' */
			*bufptr++='\'';
			*bufptr++='\\';
			*bufptr++='\'';
			*bufptr++='\'';
		} else if (shell==TCSH && *argptr=='!') {
			/* Exclamation mark: replace it with: \! */
			*bufptr++='\'';
			*bufptr++='\\';
			*bufptr++='!';
			*bufptr++='\'';
		} else if (shell==TCSH && *argptr=='\n') {
			/* Newline: replace it with: \n */
			*bufptr++='\\';
			*bufptr++='n';
		} else if (shell==TCSH && isspace(*argptr)) {
			/* Non-newline whitespace: replace it with \<ws> */
			*bufptr++='\'';
			*bufptr++='\\';
			*bufptr++=*argptr;
			*bufptr++='\'';
		} else
			/* Just copy */
			*bufptr++=*argptr;
		argptr++;
	}
	*bufptr++='\'';
	*bufptr++='\0';
	return BUFFER;
}

/*
 * Generate the output. argv[0] is the program name (used for reporting errors).
 * argv[1..] contains the options to be parsed. argc must be the number of
 * elements in argv (ie. 1 if there are no options, only the program name),
 * optstr must contain the short options, and longopts the long options.
 * Other settings are found in global variables.
 */
int generate_output(char **argv,int argc,const char *optstr,
		const struct option *longopts)
{
	int exit_code = 0; /* We assume everything will be OK */
	int opt;
	int longindex;
	const char *charptr;

	if (quiet_errors) /* No error reporting from getopt(3) */
		opterr=0;
	optind=0; /* Reset getopt(3) */

	while ((opt = (alternative?
			getopt_long_only(argc,argv,optstr,longopts,&longindex):
			getopt_long(argc,argv,optstr,longopts,&longindex)))
	       != EOF)
		if (opt == '?' || opt == ':' )
			exit_code = 1;
		else if (!quiet_output) {
			if (opt == LONG_OPT) {
				printf(" --%s",longopts[longindex].name);
				if (longopts[longindex].has_arg)
					printf(" %s",
						normalize(optarg?optarg:""));
			} else if (opt == NON_OPT)
				printf(" %s",normalize(optarg));
			else {
				printf(" -%c",opt);
				charptr = strchr(optstr,opt);
				if (charptr != NULL && *++charptr == ':')
					printf(" %s",
						normalize(optarg?optarg:""));
			}
		}

	if (! quiet_output) {
		printf(" --");
		while (optind < argc)
			printf(" %s",normalize(argv[optind++]));
		puts("");
	}
	return exit_code;
}

static struct option *long_options;
static int long_options_length; /* Length of array */
static int long_options_nr; /* Nr of used elements in array */
enum { LONG_OPTIONS_INCR = 10 };
#define init_longopt() add_longopt(NULL,0)

/* Register a long option. The contents of name is copied. */
void add_longopt(const char *name, int has_arg)
{
	if (!name) { /* init */
		free(long_options);
		long_options=NULL;
		long_options_length=0;
		long_options_nr=0;
	}

	if (long_options_nr == long_options_length) {
		long_options_length += LONG_OPTIONS_INCR;
		long_options=xrealloc(long_options,
					 sizeof(struct option) *
					 long_options_length);
	}

	long_options[long_options_nr].name=NULL;
	long_options[long_options_nr].has_arg=0;
	long_options[long_options_nr].flag=NULL;
	long_options[long_options_nr].val=0;

	if (long_options_nr) { /* Not for init! */
		long_options[long_options_nr-1].has_arg=has_arg;
		long_options[long_options_nr-1].flag=NULL;
		long_options[long_options_nr-1].val=LONG_OPT;
		long_options[long_options_nr-1].name=xstrdup(name);
	}
	long_options_nr++;
}


/*
 * Register several long options. options is a string of long options,
 * separated by commas or whitespace.
 * This nukes options!
 */
void add_long_options(char *options)
{
	int arg_opt, tlen;
	char *tokptr=strtok(options,", \t\n");
	while (tokptr) {
		arg_opt=no_argument;
		tlen=strlen(tokptr);
		if (tlen > 0) {
			if (tokptr[tlen-1] == ':') {
				if (tlen > 1 && tokptr[tlen-2] == ':') {
					tokptr[tlen-2]='\0';
					tlen -= 2;
					arg_opt=optional_argument;
				} else {
					tokptr[tlen-1]='\0';
					tlen -= 1;
					arg_opt=required_argument;
				}
				if (tlen == 0)
					bb_error_msg("empty long option after -l or --long argument");
			}
			add_longopt(tokptr,arg_opt);
		}
		tokptr=strtok(NULL,", \t\n");
	}
}

void set_shell(const char *new_shell)
{
	if (!strcmp(new_shell,"bash"))
		shell=BASH;
	else if (!strcmp(new_shell,"tcsh"))
		shell=TCSH;
	else if (!strcmp(new_shell,"sh"))
		shell=BASH;
	else if (!strcmp(new_shell,"csh"))
		shell=TCSH;
	else
		bb_error_msg("unknown shell after -s or --shell argument");
}


/* Exit codes:
 *   0) No errors, successful operation.
 *   1) getopt(3) returned an error.
 *   2) A problem with parameter parsing for getopt(1).
 *   3) Internal error, out of memory
 *   4) Returned for -T
 */

static const struct option longopts[]=
{
	{"options",required_argument,NULL,'o'},
	{"longoptions",required_argument,NULL,'l'},
	{"quiet",no_argument,NULL,'q'},
	{"quiet-output",no_argument,NULL,'Q'},
	{"shell",required_argument,NULL,'s'},
	{"test",no_argument,NULL,'T'},
	{"unquoted",no_argument,NULL,'u'},
	{"alternative",no_argument,NULL,'a'},
	{"name",required_argument,NULL,'n'},
	{NULL,0,NULL,0}
};

/* Stop scanning as soon as a non-option argument is found! */
static const char shortopts[]="+ao:l:n:qQs:Tu";


int getopt_main(int argc, char **argv);
int getopt_main(int argc, char **argv)
{
	const char *optstr = NULL;
	char *name = NULL;
	int opt;
	int compatible=0;

	init_longopt();

	if (getenv("GETOPT_COMPATIBLE"))
		compatible=1;

	if (argc == 1) {
		if (compatible) {
			/* For some reason, the original getopt gave no error
			   when there were no arguments. */
			printf(" --\n");
			return 0;
		} else
			bb_error_msg_and_die("missing optstring argument");
	}

	if (argv[1][0] != '-' || compatible) {
		char *s;

		quote=0;
		s=xmalloc(strlen(argv[1])+1);
		strcpy(s,argv[1]+strspn(argv[1],"-+"));
		argv[1]=argv[0];
		return generate_output(argv+1,argc-1,s,long_options);
	}

	while ((opt = getopt_long(argc,argv,shortopts,longopts,NULL)) != EOF)
		switch (opt) {
		case 'a':
			alternative=1;
			break;
		case 'o':
			optstr = optarg;
			break;
		case 'l':
			add_long_options(optarg);
			break;
		case 'n':
			name = optarg;
			break;
		case 'q':
			quiet_errors=1;
			break;
		case 'Q':
			quiet_output=1;
			break;
		case 's':
			set_shell(optarg);
			break;
		case 'T':
			return 4;
		case 'u':
			quote=0;
			break;
		default:
			bb_show_usage();
		}

	if (!optstr) {
		if (optind >= argc)
			bb_error_msg_and_die("missing optstring argument");
		else optstr=argv[optind++];
	}
	if (name)
		argv[optind-1]=name;
	else
		argv[optind-1]=argv[0];
	return generate_output(argv+optind-1,argc-optind+1,optstr,long_options);
}