Contents of /trunk/mkinitrd-magellan/busybox/util-linux/getopt.c
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
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Sun May 30 11:32:42 2010 UTC (14 years, 4 months ago) by niro
File MIME type: text/plain
File size: 9563 byte(s)
-updated to busybox-1.16.1 and enabled blkid/uuid support in default config
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * getopt.c - Enhanced implementation of BSD getopt(1) |
4 | * Copyright (c) 1997, 1998, 1999, 2000 Frodo Looijaard <frodol@dds.nl> |
5 | * |
6 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. |
7 | */ |
8 | |
9 | /* |
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 Mickiewicz |
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 |
31 | * |
32 | */ |
33 | |
34 | #include <getopt.h> |
35 | #include "libbb.h" |
36 | |
37 | /* NON_OPT is the code that is returned when a non-option is found in '+' |
38 | mode */ |
39 | enum { |
40 | NON_OPT = 1, |
41 | #if ENABLE_FEATURE_GETOPT_LONG |
42 | /* LONG_OPT is the code that is returned when a long option is found. */ |
43 | LONG_OPT = 2 |
44 | #endif |
45 | }; |
46 | |
47 | /* For finding activated option flags. Must match getopt32 call! */ |
48 | enum { |
49 | OPT_o = 0x1, // -o |
50 | OPT_n = 0x2, // -n |
51 | OPT_q = 0x4, // -q |
52 | OPT_Q = 0x8, // -Q |
53 | OPT_s = 0x10, // -s |
54 | OPT_T = 0x20, // -T |
55 | OPT_u = 0x40, // -u |
56 | #if ENABLE_FEATURE_GETOPT_LONG |
57 | OPT_a = 0x80, // -a |
58 | OPT_l = 0x100, // -l |
59 | #endif |
60 | SHELL_IS_TCSH = 0x8000, /* hijack this bit for other purposes */ |
61 | }; |
62 | |
63 | /* 0 is getopt_long, 1 is getopt_long_only */ |
64 | #define alternative (option_mask32 & OPT_a) |
65 | |
66 | #define quiet_errors (option_mask32 & OPT_q) |
67 | #define quiet_output (option_mask32 & OPT_Q) |
68 | #define quote (!(option_mask32 & OPT_u)) |
69 | #define shell_TCSH (option_mask32 & SHELL_IS_TCSH) |
70 | |
71 | /* |
72 | * This function 'normalizes' a single argument: it puts single quotes around |
73 | * it and escapes other special characters. If quote is false, it just |
74 | * returns its argument. |
75 | * Bash only needs special treatment for single quotes; tcsh also recognizes |
76 | * exclamation marks within single quotes, and nukes whitespace. |
77 | * This function returns a pointer to a buffer that is overwritten by |
78 | * each call. |
79 | */ |
80 | static const char *normalize(const char *arg) |
81 | { |
82 | char *bufptr; |
83 | #if ENABLE_FEATURE_CLEAN_UP |
84 | static char *BUFFER = NULL; |
85 | free(BUFFER); |
86 | #else |
87 | char *BUFFER; |
88 | #endif |
89 | |
90 | if (!quote) { /* Just copy arg */ |
91 | BUFFER = xstrdup(arg); |
92 | return BUFFER; |
93 | } |
94 | |
95 | /* Each character in arg may take up to four characters in the result: |
96 | For a quote we need a closing quote, a backslash, a quote and an |
97 | opening quote! We need also the global opening and closing quote, |
98 | and one extra character for '\0'. */ |
99 | BUFFER = xmalloc(strlen(arg)*4 + 3); |
100 | |
101 | bufptr = BUFFER; |
102 | *bufptr ++= '\''; |
103 | |
104 | while (*arg) { |
105 | if (*arg == '\'') { |
106 | /* Quote: replace it with: '\'' */ |
107 | *bufptr ++= '\''; |
108 | *bufptr ++= '\\'; |
109 | *bufptr ++= '\''; |
110 | *bufptr ++= '\''; |
111 | } else if (shell_TCSH && *arg == '!') { |
112 | /* Exclamation mark: replace it with: \! */ |
113 | *bufptr ++= '\''; |
114 | *bufptr ++= '\\'; |
115 | *bufptr ++= '!'; |
116 | *bufptr ++= '\''; |
117 | } else if (shell_TCSH && *arg == '\n') { |
118 | /* Newline: replace it with: \n */ |
119 | *bufptr ++= '\\'; |
120 | *bufptr ++= 'n'; |
121 | } else if (shell_TCSH && isspace(*arg)) { |
122 | /* Non-newline whitespace: replace it with \<ws> */ |
123 | *bufptr ++= '\''; |
124 | *bufptr ++= '\\'; |
125 | *bufptr ++= *arg; |
126 | *bufptr ++= '\''; |
127 | } else |
128 | /* Just copy */ |
129 | *bufptr ++= *arg; |
130 | arg++; |
131 | } |
132 | *bufptr ++= '\''; |
133 | *bufptr ++= '\0'; |
134 | return BUFFER; |
135 | } |
136 | |
137 | /* |
138 | * Generate the output. argv[0] is the program name (used for reporting errors). |
139 | * argv[1..] contains the options to be parsed. argc must be the number of |
140 | * elements in argv (ie. 1 if there are no options, only the program name), |
141 | * optstr must contain the short options, and longopts the long options. |
142 | * Other settings are found in global variables. |
143 | */ |
144 | #if !ENABLE_FEATURE_GETOPT_LONG |
145 | #define generate_output(argv,argc,optstr,longopts) \ |
146 | generate_output(argv,argc,optstr) |
147 | #endif |
148 | static int generate_output(char **argv, int argc, const char *optstr, const struct option *longopts) |
149 | { |
150 | int exit_code = 0; /* We assume everything will be OK */ |
151 | int opt; |
152 | #if ENABLE_FEATURE_GETOPT_LONG |
153 | int longindex; |
154 | #endif |
155 | const char *charptr; |
156 | |
157 | if (quiet_errors) /* No error reporting from getopt(3) */ |
158 | opterr = 0; |
159 | |
160 | /* We used it already in main() in getopt32(), |
161 | * we *must* reset getopt(3): */ |
162 | #ifdef __GLIBC__ |
163 | optind = 0; |
164 | #else /* BSD style */ |
165 | optind = 1; |
166 | /* optreset = 1; */ |
167 | #endif |
168 | |
169 | while (1) { |
170 | opt = |
171 | #if ENABLE_FEATURE_GETOPT_LONG |
172 | alternative ? |
173 | getopt_long_only(argc, argv, optstr, longopts, &longindex) : |
174 | getopt_long(argc, argv, optstr, longopts, &longindex); |
175 | #else |
176 | getopt(argc, argv, optstr); |
177 | #endif |
178 | if (opt == -1) |
179 | break; |
180 | if (opt == '?' || opt == ':' ) |
181 | exit_code = 1; |
182 | else if (!quiet_output) { |
183 | #if ENABLE_FEATURE_GETOPT_LONG |
184 | if (opt == LONG_OPT) { |
185 | printf(" --%s", longopts[longindex].name); |
186 | if (longopts[longindex].has_arg) |
187 | printf(" %s", |
188 | normalize(optarg ? optarg : "")); |
189 | } else |
190 | #endif |
191 | if (opt == NON_OPT) |
192 | printf(" %s", normalize(optarg)); |
193 | else { |
194 | printf(" -%c", opt); |
195 | charptr = strchr(optstr, opt); |
196 | if (charptr != NULL && *++charptr == ':') |
197 | printf(" %s", |
198 | normalize(optarg ? optarg : "")); |
199 | } |
200 | } |
201 | } |
202 | |
203 | if (!quiet_output) { |
204 | printf(" --"); |
205 | while (optind < argc) |
206 | printf(" %s", normalize(argv[optind++])); |
207 | bb_putchar('\n'); |
208 | } |
209 | return exit_code; |
210 | } |
211 | |
212 | #if ENABLE_FEATURE_GETOPT_LONG |
213 | /* |
214 | * Register several long options. options is a string of long options, |
215 | * separated by commas or whitespace. |
216 | * This nukes options! |
217 | */ |
218 | static struct option *add_long_options(struct option *long_options, char *options) |
219 | { |
220 | int long_nr = 0; |
221 | int arg_opt, tlen; |
222 | char *tokptr = strtok(options, ", \t\n"); |
223 | |
224 | if (long_options) |
225 | while (long_options[long_nr].name) |
226 | long_nr++; |
227 | |
228 | while (tokptr) { |
229 | arg_opt = no_argument; |
230 | tlen = strlen(tokptr); |
231 | if (tlen) { |
232 | tlen--; |
233 | if (tokptr[tlen] == ':') { |
234 | arg_opt = required_argument; |
235 | if (tlen && tokptr[tlen-1] == ':') { |
236 | tlen--; |
237 | arg_opt = optional_argument; |
238 | } |
239 | tokptr[tlen] = '\0'; |
240 | if (tlen == 0) |
241 | bb_error_msg_and_die("empty long option specified"); |
242 | } |
243 | long_options = xrealloc_vector(long_options, 4, long_nr); |
244 | long_options[long_nr].has_arg = arg_opt; |
245 | /*long_options[long_nr].flag = NULL; - xrealloc_vector did it */ |
246 | long_options[long_nr].val = LONG_OPT; |
247 | long_options[long_nr].name = xstrdup(tokptr); |
248 | long_nr++; |
249 | /*memset(&long_options[long_nr], 0, sizeof(long_options[0])); - xrealloc_vector did it */ |
250 | } |
251 | tokptr = strtok(NULL, ", \t\n"); |
252 | } |
253 | return long_options; |
254 | } |
255 | #endif |
256 | |
257 | static void set_shell(const char *new_shell) |
258 | { |
259 | if (!strcmp(new_shell, "bash") || !strcmp(new_shell, "sh")) |
260 | return; |
261 | if (!strcmp(new_shell, "tcsh") || !strcmp(new_shell, "csh")) |
262 | option_mask32 |= SHELL_IS_TCSH; |
263 | else |
264 | bb_error_msg("unknown shell '%s', assuming bash", new_shell); |
265 | } |
266 | |
267 | |
268 | /* Exit codes: |
269 | * 0) No errors, successful operation. |
270 | * 1) getopt(3) returned an error. |
271 | * 2) A problem with parameter parsing for getopt(1). |
272 | * 3) Internal error, out of memory |
273 | * 4) Returned for -T |
274 | */ |
275 | |
276 | #if ENABLE_FEATURE_GETOPT_LONG |
277 | static const char getopt_longopts[] ALIGN1 = |
278 | "options\0" Required_argument "o" |
279 | "longoptions\0" Required_argument "l" |
280 | "quiet\0" No_argument "q" |
281 | "quiet-output\0" No_argument "Q" |
282 | "shell\0" Required_argument "s" |
283 | "test\0" No_argument "T" |
284 | "unquoted\0" No_argument "u" |
285 | "alternative\0" No_argument "a" |
286 | "name\0" Required_argument "n" |
287 | ; |
288 | #endif |
289 | |
290 | int getopt_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
291 | int getopt_main(int argc, char **argv) |
292 | { |
293 | char *optstr = NULL; |
294 | char *name = NULL; |
295 | unsigned opt; |
296 | const char *compatible; |
297 | char *s_arg; |
298 | #if ENABLE_FEATURE_GETOPT_LONG |
299 | struct option *long_options = NULL; |
300 | llist_t *l_arg = NULL; |
301 | #endif |
302 | |
303 | compatible = getenv("GETOPT_COMPATIBLE"); /* used as yes/no flag */ |
304 | |
305 | if (argc == 1) { |
306 | if (compatible) { |
307 | /* For some reason, the original getopt gave no error |
308 | when there were no arguments. */ |
309 | printf(" --\n"); |
310 | return 0; |
311 | } |
312 | bb_error_msg_and_die("missing optstring argument"); |
313 | } |
314 | |
315 | if (argv[1][0] != '-' || compatible) { |
316 | char *s; |
317 | |
318 | option_mask32 |= OPT_u; /* quoting off */ |
319 | s = xstrdup(argv[1] + strspn(argv[1], "-+")); |
320 | argv[1] = argv[0]; |
321 | return generate_output(argv+1, argc-1, s, long_options); |
322 | } |
323 | |
324 | #if !ENABLE_FEATURE_GETOPT_LONG |
325 | opt = getopt32(argv, "+o:n:qQs:Tu", &optstr, &name, &s_arg); |
326 | #else |
327 | applet_long_options = getopt_longopts; |
328 | opt_complementary = "l::"; |
329 | opt = getopt32(argv, "+o:n:qQs:Tual:", |
330 | &optstr, &name, &s_arg, &l_arg); |
331 | /* Effectuate the read options for the applet itself */ |
332 | while (l_arg) { |
333 | long_options = add_long_options(long_options, llist_pop(&l_arg)); |
334 | } |
335 | #endif |
336 | |
337 | if (opt & OPT_s) { |
338 | set_shell(s_arg); |
339 | } |
340 | |
341 | if (opt & OPT_T) { |
342 | return 4; |
343 | } |
344 | |
345 | /* All options controlling the applet have now been parsed */ |
346 | if (!optstr) { |
347 | if (optind >= argc) |
348 | bb_error_msg_and_die("missing optstring argument"); |
349 | optstr = argv[optind++]; |
350 | } |
351 | |
352 | argv[optind-1] = name ? name : argv[0]; |
353 | return generate_output(argv+optind-1, argc-optind+1, optstr, long_options); |
354 | } |