Contents of /trunk/mkinitrd-magellan/busybox/util-linux/getopt.c
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Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
File size: 9527 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
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 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 |
31 | * |
32 | */ |
33 | |
34 | #include "busybox.h" |
35 | #include <getopt.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 | /* LONG_OPT is the code that is returned when a long option is found. */ |
42 | LONG_OPT = 2 |
43 | }; |
44 | |
45 | /* The shells recognized. */ |
46 | typedef enum {BASH,TCSH} shell_t; |
47 | |
48 | |
49 | /* Some global variables that tells us how to parse. */ |
50 | static shell_t shell=BASH; /* The shell we generate output for. */ |
51 | static int quiet_errors; /* 0 is not quiet. */ |
52 | static int quiet_output; /* 0 is not quiet. */ |
53 | static int quote=1; /* 1 is do quote. */ |
54 | static int alternative; /* 0 is getopt_long, 1 is getopt_long_only */ |
55 | |
56 | /* Function prototypes */ |
57 | static const char *normalize(const char *arg); |
58 | static int generate_output(char * argv[],int argc,const char *optstr, |
59 | const struct option *longopts); |
60 | static void add_long_options(char *options); |
61 | static void add_longopt(const char *name,int has_arg); |
62 | static void set_shell(const char *new_shell); |
63 | |
64 | |
65 | /* |
66 | * This function 'normalizes' a single argument: it puts single quotes around |
67 | * it and escapes other special characters. If quote is false, it just |
68 | * returns its argument. |
69 | * Bash only needs special treatment for single quotes; tcsh also recognizes |
70 | * exclamation marks within single quotes, and nukes whitespace. |
71 | * This function returns a pointer to a buffer that is overwritten by |
72 | * each call. |
73 | */ |
74 | const char *normalize(const char *arg) |
75 | { |
76 | static char *BUFFER=NULL; |
77 | const char *argptr=arg; |
78 | char *bufptr; |
79 | |
80 | free(BUFFER); |
81 | |
82 | if (!quote) { /* Just copy arg */ |
83 | BUFFER=xstrdup(arg); |
84 | return BUFFER; |
85 | } |
86 | |
87 | /* Each character in arg may take up to four characters in the result: |
88 | For a quote we need a closing quote, a backslash, a quote and an |
89 | opening quote! We need also the global opening and closing quote, |
90 | and one extra character for '\0'. */ |
91 | BUFFER=xmalloc(strlen(arg)*4+3); |
92 | |
93 | bufptr=BUFFER; |
94 | *bufptr++='\''; |
95 | |
96 | while (*argptr) { |
97 | if (*argptr == '\'') { |
98 | /* Quote: replace it with: '\'' */ |
99 | *bufptr++='\''; |
100 | *bufptr++='\\'; |
101 | *bufptr++='\''; |
102 | *bufptr++='\''; |
103 | } else if (shell==TCSH && *argptr=='!') { |
104 | /* Exclamation mark: replace it with: \! */ |
105 | *bufptr++='\''; |
106 | *bufptr++='\\'; |
107 | *bufptr++='!'; |
108 | *bufptr++='\''; |
109 | } else if (shell==TCSH && *argptr=='\n') { |
110 | /* Newline: replace it with: \n */ |
111 | *bufptr++='\\'; |
112 | *bufptr++='n'; |
113 | } else if (shell==TCSH && isspace(*argptr)) { |
114 | /* Non-newline whitespace: replace it with \<ws> */ |
115 | *bufptr++='\''; |
116 | *bufptr++='\\'; |
117 | *bufptr++=*argptr; |
118 | *bufptr++='\''; |
119 | } else |
120 | /* Just copy */ |
121 | *bufptr++=*argptr; |
122 | argptr++; |
123 | } |
124 | *bufptr++='\''; |
125 | *bufptr++='\0'; |
126 | return BUFFER; |
127 | } |
128 | |
129 | /* |
130 | * Generate the output. argv[0] is the program name (used for reporting errors). |
131 | * argv[1..] contains the options to be parsed. argc must be the number of |
132 | * elements in argv (ie. 1 if there are no options, only the program name), |
133 | * optstr must contain the short options, and longopts the long options. |
134 | * Other settings are found in global variables. |
135 | */ |
136 | int generate_output(char * argv[],int argc,const char *optstr, |
137 | const struct option *longopts) |
138 | { |
139 | int exit_code = 0; /* We assume everything will be OK */ |
140 | int opt; |
141 | int longindex; |
142 | const char *charptr; |
143 | |
144 | if (quiet_errors) /* No error reporting from getopt(3) */ |
145 | opterr=0; |
146 | optind=0; /* Reset getopt(3) */ |
147 | |
148 | while ((opt = (alternative? |
149 | getopt_long_only(argc,argv,optstr,longopts,&longindex): |
150 | getopt_long(argc,argv,optstr,longopts,&longindex))) |
151 | != EOF) |
152 | if (opt == '?' || opt == ':' ) |
153 | exit_code = 1; |
154 | else if (!quiet_output) { |
155 | if (opt == LONG_OPT) { |
156 | printf(" --%s",longopts[longindex].name); |
157 | if (longopts[longindex].has_arg) |
158 | printf(" %s", |
159 | normalize(optarg?optarg:"")); |
160 | } else if (opt == NON_OPT) |
161 | printf(" %s",normalize(optarg)); |
162 | else { |
163 | printf(" -%c",opt); |
164 | charptr = strchr(optstr,opt); |
165 | if (charptr != NULL && *++charptr == ':') |
166 | printf(" %s", |
167 | normalize(optarg?optarg:"")); |
168 | } |
169 | } |
170 | |
171 | if (! quiet_output) { |
172 | printf(" --"); |
173 | while (optind < argc) |
174 | printf(" %s",normalize(argv[optind++])); |
175 | puts(""); |
176 | } |
177 | return exit_code; |
178 | } |
179 | |
180 | static struct option *long_options; |
181 | static int long_options_length; /* Length of array */ |
182 | static int long_options_nr; /* Nr of used elements in array */ |
183 | enum { LONG_OPTIONS_INCR = 10 }; |
184 | #define init_longopt() add_longopt(NULL,0) |
185 | |
186 | /* Register a long option. The contents of name is copied. */ |
187 | void add_longopt(const char *name, int has_arg) |
188 | { |
189 | if (!name) { /* init */ |
190 | free(long_options); |
191 | long_options=NULL; |
192 | long_options_length=0; |
193 | long_options_nr=0; |
194 | } |
195 | |
196 | if (long_options_nr == long_options_length) { |
197 | long_options_length += LONG_OPTIONS_INCR; |
198 | long_options=xrealloc(long_options, |
199 | sizeof(struct option) * |
200 | long_options_length); |
201 | } |
202 | |
203 | long_options[long_options_nr].name=NULL; |
204 | long_options[long_options_nr].has_arg=0; |
205 | long_options[long_options_nr].flag=NULL; |
206 | long_options[long_options_nr].val=0; |
207 | |
208 | if (long_options_nr) { /* Not for init! */ |
209 | long_options[long_options_nr-1].has_arg=has_arg; |
210 | long_options[long_options_nr-1].flag=NULL; |
211 | long_options[long_options_nr-1].val=LONG_OPT; |
212 | long_options[long_options_nr-1].name=xstrdup(name); |
213 | } |
214 | long_options_nr++; |
215 | } |
216 | |
217 | |
218 | /* |
219 | * Register several long options. options is a string of long options, |
220 | * separated by commas or whitespace. |
221 | * This nukes options! |
222 | */ |
223 | void add_long_options(char *options) |
224 | { |
225 | int arg_opt, tlen; |
226 | char *tokptr=strtok(options,", \t\n"); |
227 | while (tokptr) { |
228 | arg_opt=no_argument; |
229 | tlen=strlen(tokptr); |
230 | if (tlen > 0) { |
231 | if (tokptr[tlen-1] == ':') { |
232 | if (tlen > 1 && tokptr[tlen-2] == ':') { |
233 | tokptr[tlen-2]='\0'; |
234 | tlen -= 2; |
235 | arg_opt=optional_argument; |
236 | } else { |
237 | tokptr[tlen-1]='\0'; |
238 | tlen -= 1; |
239 | arg_opt=required_argument; |
240 | } |
241 | if (tlen == 0) |
242 | bb_error_msg("empty long option after -l or --long argument"); |
243 | } |
244 | add_longopt(tokptr,arg_opt); |
245 | } |
246 | tokptr=strtok(NULL,", \t\n"); |
247 | } |
248 | } |
249 | |
250 | void set_shell(const char *new_shell) |
251 | { |
252 | if (!strcmp(new_shell,"bash")) |
253 | shell=BASH; |
254 | else if (!strcmp(new_shell,"tcsh")) |
255 | shell=TCSH; |
256 | else if (!strcmp(new_shell,"sh")) |
257 | shell=BASH; |
258 | else if (!strcmp(new_shell,"csh")) |
259 | shell=TCSH; |
260 | else |
261 | bb_error_msg("unknown shell after -s or --shell argument"); |
262 | } |
263 | |
264 | |
265 | /* Exit codes: |
266 | * 0) No errors, successful operation. |
267 | * 1) getopt(3) returned an error. |
268 | * 2) A problem with parameter parsing for getopt(1). |
269 | * 3) Internal error, out of memory |
270 | * 4) Returned for -T |
271 | */ |
272 | |
273 | static const struct option longopts[]= |
274 | { |
275 | {"options",required_argument,NULL,'o'}, |
276 | {"longoptions",required_argument,NULL,'l'}, |
277 | {"quiet",no_argument,NULL,'q'}, |
278 | {"quiet-output",no_argument,NULL,'Q'}, |
279 | {"shell",required_argument,NULL,'s'}, |
280 | {"test",no_argument,NULL,'T'}, |
281 | {"unquoted",no_argument,NULL,'u'}, |
282 | {"alternative",no_argument,NULL,'a'}, |
283 | {"name",required_argument,NULL,'n'}, |
284 | {NULL,0,NULL,0} |
285 | }; |
286 | |
287 | /* Stop scanning as soon as a non-option argument is found! */ |
288 | static const char shortopts[]="+ao:l:n:qQs:Tu"; |
289 | |
290 | |
291 | int getopt_main(int argc, char *argv[]) |
292 | { |
293 | const char *optstr = NULL; |
294 | char *name = NULL; |
295 | int opt; |
296 | int compatible=0; |
297 | |
298 | init_longopt(); |
299 | |
300 | if (getenv("GETOPT_COMPATIBLE")) |
301 | compatible=1; |
302 | |
303 | if (argc == 1) { |
304 | if (compatible) { |
305 | /* For some reason, the original getopt gave no error |
306 | when there were no arguments. */ |
307 | printf(" --\n"); |
308 | return 0; |
309 | } else |
310 | bb_error_msg_and_die("missing optstring argument"); |
311 | } |
312 | |
313 | if (argv[1][0] != '-' || compatible) { |
314 | char *s; |
315 | |
316 | quote=0; |
317 | s=xmalloc(strlen(argv[1])+1); |
318 | strcpy(s,argv[1]+strspn(argv[1],"-+")); |
319 | argv[1]=argv[0]; |
320 | return generate_output(argv+1,argc-1,s,long_options); |
321 | } |
322 | |
323 | while ((opt = getopt_long(argc,argv,shortopts,longopts,NULL)) != EOF) |
324 | switch (opt) { |
325 | case 'a': |
326 | alternative=1; |
327 | break; |
328 | case 'o': |
329 | optstr = optarg; |
330 | break; |
331 | case 'l': |
332 | add_long_options(optarg); |
333 | break; |
334 | case 'n': |
335 | name = optarg; |
336 | break; |
337 | case 'q': |
338 | quiet_errors=1; |
339 | break; |
340 | case 'Q': |
341 | quiet_output=1; |
342 | break; |
343 | case 's': |
344 | set_shell(optarg); |
345 | break; |
346 | case 'T': |
347 | return 4; |
348 | case 'u': |
349 | quote=0; |
350 | break; |
351 | default: |
352 | bb_show_usage(); |
353 | } |
354 | |
355 | if (!optstr) { |
356 | if (optind >= argc) |
357 | bb_error_msg_and_die("missing optstring argument"); |
358 | else optstr=argv[optind++]; |
359 | } |
360 | if (name) |
361 | argv[optind-1]=name; |
362 | else |
363 | argv[optind-1]=argv[0]; |
364 | return generate_output(argv+optind-1,argc-optind+1,optstr,long_options); |
365 | } |