1 /* vi: set sw=4 ts=4: */
3 * getopt.c - Enhanced implementation of BSD getopt(1)
4 * Copyright (c) 1997, 1998, 1999, 2000 Frodo Looijaard <frodol@dds.nl>
6 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10 * Version 1.0-b4: Tue Sep 23 1997. First public release.
11 * Version 1.0: Wed Nov 19 1997.
12 * Bumped up the version number to 1.0
13 * Fixed minor typo (CSH instead of TCSH)
14 * Version 1.0.1: Tue Jun 3 1998
15 * Fixed sizeof instead of strlen bug
16 * Bumped up the version number to 1.0.1
17 * Version 1.0.2: Thu Jun 11 1998 (not present)
18 * Fixed gcc-2.8.1 warnings
19 * Fixed --version/-V option (not present)
20 * Version 1.0.5: Tue Jun 22 1999
21 * Make -u option work (not present)
22 * Version 1.0.6: Tue Jun 27 2000
23 * No important changes
24 * Version 1.1.0: Tue Jun 30 2000
25 * Added NLS support (partly written by Arkadiusz Mi<B6>kiewicz
26 * <misiek@misiek.eu.org>)
27 * Ported to Busybox - Alfred M. Szmidt <ams@trillian.itslinux.org>
28 * Removed --version/-V and --help/-h in
29 * Removed parse_error(), using bb_error_msg() from Busybox instead
30 * Replaced our_malloc with xmalloc and our_realloc with xrealloc
37 /* NON_OPT is the code that is returned when a non-option is found in '+'
41 /* LONG_OPT is the code that is returned when a long option is found. */
45 /* For finding activated option flags. Must match getopt32 call! */
56 SHELL_IS_TCSH = 0x8000, /* hijack this bit for other purposes */
59 /* 0 is getopt_long, 1 is getopt_long_only */
60 #define alternative (option_mask32 & OPT_a)
62 #define quiet_errors (option_mask32 & OPT_q)
63 #define quiet_output (option_mask32 & OPT_Q)
64 #define quote (!(option_mask32 & OPT_u))
65 #define shell_TCSH (option_mask32 & SHELL_IS_TCSH)
68 * This function 'normalizes' a single argument: it puts single quotes around
69 * it and escapes other special characters. If quote is false, it just
70 * returns its argument.
71 * Bash only needs special treatment for single quotes; tcsh also recognizes
72 * exclamation marks within single quotes, and nukes whitespace.
73 * This function returns a pointer to a buffer that is overwritten by
76 static const char *normalize(const char *arg)
79 #if ENABLE_FEATURE_CLEAN_UP
80 static char *BUFFER = NULL;
86 if (!quote) { /* Just copy arg */
87 BUFFER = xstrdup(arg);
91 /* Each character in arg may take up to four characters in the result:
92 For a quote we need a closing quote, a backslash, a quote and an
93 opening quote! We need also the global opening and closing quote,
94 and one extra character for '\0'. */
95 BUFFER = xmalloc(strlen(arg)*4 + 3);
102 /* Quote: replace it with: '\'' */
107 } else if (shell_TCSH && *arg == '!') {
108 /* Exclamation mark: replace it with: \! */
113 } else if (shell_TCSH && *arg == '\n') {
114 /* Newline: replace it with: \n */
117 } else if (shell_TCSH && isspace(*arg)) {
118 /* Non-newline whitespace: replace it with \<ws> */
134 * Generate the output. argv[0] is the program name (used for reporting errors).
135 * argv[1..] contains the options to be parsed. argc must be the number of
136 * elements in argv (ie. 1 if there are no options, only the program name),
137 * optstr must contain the short options, and longopts the long options.
138 * Other settings are found in global variables.
140 static int generate_output(char * argv[],int argc,const char *optstr,
141 const struct option *longopts)
143 int exit_code = 0; /* We assume everything will be OK */
148 if (quiet_errors) /* No error reporting from getopt(3) */
150 optind = 0; /* Reset getopt(3) */
152 while ((opt = (alternative ?
153 getopt_long_only(argc,argv,optstr,longopts,&longindex) :
154 getopt_long(argc,argv,optstr,longopts,&longindex)))
156 if (opt == '?' || opt == ':' )
158 else if (!quiet_output) {
159 if (opt == LONG_OPT) {
160 printf(" --%s", longopts[longindex].name);
161 if (longopts[longindex].has_arg)
163 normalize(optarg ? optarg : ""));
164 } else if (opt == NON_OPT)
165 printf(" %s", normalize(optarg));
168 charptr = strchr(optstr,opt);
169 if (charptr != NULL && *++charptr == ':')
171 normalize(optarg ? optarg : ""));
177 while (optind < argc)
178 printf(" %s", normalize(argv[optind++]));
185 * Register several long options. options is a string of long options,
186 * separated by commas or whitespace.
187 * This nukes options!
189 static struct option *add_long_options(struct option *long_options, char *options)
193 char *tokptr = strtok(options, ", \t\n");
196 while (long_options[long_nr].name)
200 arg_opt = no_argument;
201 tlen = strlen(tokptr);
204 if (tokptr[tlen] == ':') {
205 arg_opt = required_argument;
206 if (tlen && tokptr[tlen-1] == ':') {
208 arg_opt = optional_argument;
212 bb_error_msg_and_die("empty long option specified");
214 long_options = xrealloc(long_options,
215 sizeof(long_options[0]) * (long_nr+2));
216 long_options[long_nr].has_arg = arg_opt;
217 long_options[long_nr].flag = NULL;
218 long_options[long_nr].val = LONG_OPT;
219 long_options[long_nr].name = xstrdup(tokptr);
221 memset(&long_options[long_nr], 0, sizeof(long_options[0]));
223 tokptr = strtok(NULL, ", \t\n");
228 static void set_shell(const char *new_shell)
230 if (!strcmp(new_shell,"bash") || !strcmp(new_shell,"sh"))
232 if (!strcmp(new_shell,"tcsh") || !strcmp(new_shell,"csh"))
233 option_mask32 |= SHELL_IS_TCSH;
235 bb_error_msg("unknown shell '%s', assuming bash", new_shell);
240 * 0) No errors, successful operation.
241 * 1) getopt(3) returned an error.
242 * 2) A problem with parameter parsing for getopt(1).
243 * 3) Internal error, out of memory
247 #if ENABLE_GETOPT_LONG
248 static const struct option longopts[] = {
249 { "options", required_argument, NULL, 'o' },
250 { "longoptions", required_argument, NULL, 'l' },
251 { "quiet", no_argument, NULL, 'q' },
252 { "quiet-output", no_argument, NULL, 'Q' },
253 { "shell", required_argument, NULL, 's' },
254 { "test", no_argument, NULL, 'T' },
255 { "unquoted", no_argument, NULL, 'u' },
256 { "alternative", no_argument, NULL, 'a' },
257 { "name", required_argument, NULL, 'n' },
262 int getopt_main(int argc, char *argv[]);
263 int getopt_main(int argc, char *argv[])
265 struct option *long_options = NULL;
269 const char *compatible;
271 #if ENABLE_GETOPT_LONG
272 llist_t *l_arg = NULL;
275 compatible = getenv("GETOPT_COMPATIBLE"); /* used as yes/no flag */
279 /* For some reason, the original getopt gave no error
280 when there were no arguments. */
284 bb_error_msg_and_die("missing optstring argument");
287 if (argv[1][0] != '-' || compatible) {
290 option_mask32 |= OPT_u; /* quoting off */
291 s = xstrdup(argv[1] + strspn(argv[1], "-+"));
293 return generate_output(argv+1, argc-1, s, long_options);
296 #if !ENABLE_GETOPT_LONG
297 opt = getopt32(argc, argv, "+o:n:qQs:Tu", &optstr, &name, &s_arg);
299 applet_long_options = longopts;
300 opt_complementary = "?:l::";
301 opt = getopt32(argc, argv, "+o:n:qQs:Tual:",
302 &optstr, &name, &s_arg, &l_arg);
303 /* Effectuate the read options for the applet itself */
305 long_options = add_long_options(long_options, l_arg->data);
318 /* All options controlling the applet have now been parsed */
321 bb_error_msg_and_die("missing optstring argument");
322 optstr = argv[optind++];
325 argv[optind-1] = name ? name : argv[0];
326 return generate_output(argv+optind-1, argc-optind+1, optstr, long_options);