Annotation of /trunk/mkinitrd-magellan/busybox/coreutils/cut.c
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Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (16 years, 8 months ago) by niro
File MIME type: text/plain
File size: 7978 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 | niro | 532 | /* vi: set sw=4 ts=4: */ |
2 | /* | ||
3 | * cut.c - minimalist version of cut | ||
4 | * | ||
5 | * Copyright (C) 1999,2000,2001 by Lineo, inc. | ||
6 | * Written by Mark Whitley <markw@codepoet.org> | ||
7 | * debloated by Bernhard Fischer | ||
8 | * | ||
9 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. | ||
10 | */ | ||
11 | |||
12 | #include "busybox.h" | ||
13 | |||
14 | /* option vars */ | ||
15 | static const char optstring[] = "b:c:f:d:sn"; | ||
16 | #define CUT_OPT_BYTE_FLGS (1<<0) | ||
17 | #define CUT_OPT_CHAR_FLGS (1<<1) | ||
18 | #define CUT_OPT_FIELDS_FLGS (1<<2) | ||
19 | #define CUT_OPT_DELIM_FLGS (1<<3) | ||
20 | #define CUT_OPT_SUPPRESS_FLGS (1<<4) | ||
21 | |||
22 | static char delim = '\t'; /* delimiter, default is tab */ | ||
23 | |||
24 | struct cut_list { | ||
25 | int startpos; | ||
26 | int endpos; | ||
27 | }; | ||
28 | |||
29 | enum { | ||
30 | BOL = 0, | ||
31 | EOL = INT_MAX, | ||
32 | NON_RANGE = -1 | ||
33 | }; | ||
34 | |||
35 | /* growable array holding a series of lists */ | ||
36 | static struct cut_list *cut_lists; | ||
37 | static unsigned int nlists; /* number of elements in above list */ | ||
38 | |||
39 | |||
40 | static int cmpfunc(const void *a, const void *b) | ||
41 | { | ||
42 | return (((struct cut_list *) a)->startpos - | ||
43 | ((struct cut_list *) b)->startpos); | ||
44 | |||
45 | } | ||
46 | |||
47 | static void cut_file(FILE * file) | ||
48 | { | ||
49 | char *line = NULL; | ||
50 | unsigned int linenum = 0; /* keep these zero-based to be consistent */ | ||
51 | |||
52 | /* go through every line in the file */ | ||
53 | while ((line = xmalloc_getline(file)) != NULL) { | ||
54 | |||
55 | /* set up a list so we can keep track of what's been printed */ | ||
56 | char * printed = xzalloc(strlen(line) * sizeof(char)); | ||
57 | char * orig_line = line; | ||
58 | unsigned int cl_pos = 0; | ||
59 | int spos; | ||
60 | |||
61 | /* cut based on chars/bytes XXX: only works when sizeof(char) == byte */ | ||
62 | if (option_mask32 & (CUT_OPT_CHAR_FLGS | CUT_OPT_BYTE_FLGS)) { | ||
63 | /* print the chars specified in each cut list */ | ||
64 | for (; cl_pos < nlists; cl_pos++) { | ||
65 | spos = cut_lists[cl_pos].startpos; | ||
66 | while (spos < strlen(line)) { | ||
67 | if (!printed[spos]) { | ||
68 | printed[spos] = 'X'; | ||
69 | putchar(line[spos]); | ||
70 | } | ||
71 | spos++; | ||
72 | if (spos > cut_lists[cl_pos].endpos | ||
73 | || cut_lists[cl_pos].endpos == NON_RANGE) | ||
74 | break; | ||
75 | } | ||
76 | } | ||
77 | } else if (delim == '\n') { /* cut by lines */ | ||
78 | spos = cut_lists[cl_pos].startpos; | ||
79 | |||
80 | /* get out if we have no more lists to process or if the lines | ||
81 | * are lower than what we're interested in */ | ||
82 | if (linenum < spos || cl_pos >= nlists) | ||
83 | goto next_line; | ||
84 | |||
85 | /* if the line we're looking for is lower than the one we were | ||
86 | * passed, it means we displayed it already, so move on */ | ||
87 | while (spos < linenum) { | ||
88 | spos++; | ||
89 | /* go to the next list if we're at the end of this one */ | ||
90 | if (spos > cut_lists[cl_pos].endpos | ||
91 | || cut_lists[cl_pos].endpos == NON_RANGE) { | ||
92 | cl_pos++; | ||
93 | /* get out if there's no more lists to process */ | ||
94 | if (cl_pos >= nlists) | ||
95 | goto next_line; | ||
96 | spos = cut_lists[cl_pos].startpos; | ||
97 | /* get out if the current line is lower than the one | ||
98 | * we just became interested in */ | ||
99 | if (linenum < spos) | ||
100 | goto next_line; | ||
101 | } | ||
102 | } | ||
103 | |||
104 | /* If we made it here, it means we've found the line we're | ||
105 | * looking for, so print it */ | ||
106 | puts(line); | ||
107 | goto next_line; | ||
108 | } else { /* cut by fields */ | ||
109 | int ndelim = -1; /* zero-based / one-based problem */ | ||
110 | int nfields_printed = 0; | ||
111 | char *field = NULL; | ||
112 | const char delimiter[2] = { delim, 0 }; | ||
113 | |||
114 | /* does this line contain any delimiters? */ | ||
115 | if (strchr(line, delim) == NULL) { | ||
116 | if (!(option_mask32 & CUT_OPT_SUPPRESS_FLGS)) | ||
117 | puts(line); | ||
118 | goto next_line; | ||
119 | } | ||
120 | |||
121 | /* process each list on this line, for as long as we've got | ||
122 | * a line to process */ | ||
123 | for (; cl_pos < nlists && line; cl_pos++) { | ||
124 | spos = cut_lists[cl_pos].startpos; | ||
125 | do { | ||
126 | /* find the field we're looking for */ | ||
127 | while (line && ndelim < spos) { | ||
128 | field = strsep(&line, delimiter); | ||
129 | ndelim++; | ||
130 | } | ||
131 | |||
132 | /* we found it, and it hasn't been printed yet */ | ||
133 | if (field && ndelim == spos && !printed[ndelim]) { | ||
134 | /* if this isn't our first time through, we need to | ||
135 | * print the delimiter after the last field that was | ||
136 | * printed */ | ||
137 | if (nfields_printed > 0) | ||
138 | putchar(delim); | ||
139 | fputs(field, stdout); | ||
140 | printed[ndelim] = 'X'; | ||
141 | nfields_printed++; /* shouldn't overflow.. */ | ||
142 | } | ||
143 | |||
144 | spos++; | ||
145 | |||
146 | /* keep going as long as we have a line to work with, | ||
147 | * this is a list, and we're not at the end of that | ||
148 | * list */ | ||
149 | } while (spos <= cut_lists[cl_pos].endpos && line | ||
150 | && cut_lists[cl_pos].endpos != NON_RANGE); | ||
151 | } | ||
152 | } | ||
153 | /* if we printed anything at all, we need to finish it with a | ||
154 | * newline cuz we were handed a chomped line */ | ||
155 | putchar('\n'); | ||
156 | next_line: | ||
157 | linenum++; | ||
158 | free(printed); | ||
159 | free(orig_line); | ||
160 | } | ||
161 | } | ||
162 | |||
163 | static const char _op_on_field[] = " only when operating on fields"; | ||
164 | |||
165 | int cut_main(int argc, char **argv) | ||
166 | { | ||
167 | char *sopt, *ltok; | ||
168 | |||
169 | opt_complementary = "b--bcf:c--bcf:f--bcf"; | ||
170 | getopt32(argc, argv, optstring, &sopt, &sopt, &sopt, <ok); | ||
171 | // argc -= optind; | ||
172 | argv += optind; | ||
173 | if (!(option_mask32 & (CUT_OPT_BYTE_FLGS | CUT_OPT_CHAR_FLGS | CUT_OPT_FIELDS_FLGS))) | ||
174 | bb_error_msg_and_die("expected a list of bytes, characters, or fields"); | ||
175 | if (option_mask32 & BB_GETOPT_ERROR) | ||
176 | bb_error_msg_and_die("only one type of list may be specified"); | ||
177 | |||
178 | if (option_mask32 & CUT_OPT_DELIM_FLGS) { | ||
179 | if (strlen(ltok) > 1) { | ||
180 | bb_error_msg_and_die("the delimiter must be a single character"); | ||
181 | } | ||
182 | delim = ltok[0]; | ||
183 | } | ||
184 | |||
185 | /* non-field (char or byte) cutting has some special handling */ | ||
186 | if (!(option_mask32 & CUT_OPT_FIELDS_FLGS)) { | ||
187 | if (option_mask32 & CUT_OPT_SUPPRESS_FLGS) { | ||
188 | bb_error_msg_and_die | ||
189 | ("suppressing non-delimited lines makes sense%s", | ||
190 | _op_on_field); | ||
191 | } | ||
192 | if (delim != '\t') { | ||
193 | bb_error_msg_and_die | ||
194 | ("a delimiter may be specified%s", _op_on_field); | ||
195 | } | ||
196 | } | ||
197 | |||
198 | /* | ||
199 | * parse list and put values into startpos and endpos. | ||
200 | * valid list formats: N, N-, N-M, -M | ||
201 | * more than one list can be separated by commas | ||
202 | */ | ||
203 | { | ||
204 | char *ntok; | ||
205 | int s = 0, e = 0; | ||
206 | |||
207 | /* take apart the lists, one by one (they are separated with commas */ | ||
208 | while ((ltok = strsep(&sopt, ",")) != NULL) { | ||
209 | |||
210 | /* it's actually legal to pass an empty list */ | ||
211 | if (strlen(ltok) == 0) | ||
212 | continue; | ||
213 | |||
214 | /* get the start pos */ | ||
215 | ntok = strsep(<ok, "-"); | ||
216 | if (ntok == NULL) { | ||
217 | bb_error_msg | ||
218 | ("internal error: ntok is null for start pos!?\n"); | ||
219 | } else if (strlen(ntok) == 0) { | ||
220 | s = BOL; | ||
221 | } else { | ||
222 | s = xatoi_u(ntok); | ||
223 | /* account for the fact that arrays are zero based, while | ||
224 | * the user expects the first char on the line to be char #1 */ | ||
225 | if (s != 0) | ||
226 | s--; | ||
227 | } | ||
228 | |||
229 | /* get the end pos */ | ||
230 | ntok = strsep(<ok, "-"); | ||
231 | if (ntok == NULL) { | ||
232 | e = NON_RANGE; | ||
233 | } else if (strlen(ntok) == 0) { | ||
234 | e = EOL; | ||
235 | } else { | ||
236 | e = xatoi_u(ntok); | ||
237 | /* if the user specified and end position of 0, that means "til the | ||
238 | * end of the line */ | ||
239 | if (e == 0) | ||
240 | e = EOL; | ||
241 | e--; /* again, arrays are zero based, lines are 1 based */ | ||
242 | if (e == s) | ||
243 | e = NON_RANGE; | ||
244 | } | ||
245 | |||
246 | /* if there's something left to tokenize, the user passed | ||
247 | * an invalid list */ | ||
248 | if (ltok) | ||
249 | bb_error_msg_and_die("invalid byte or field list"); | ||
250 | |||
251 | /* add the new list */ | ||
252 | cut_lists = xrealloc(cut_lists, sizeof(struct cut_list) * (++nlists)); | ||
253 | cut_lists[nlists-1].startpos = s; | ||
254 | cut_lists[nlists-1].endpos = e; | ||
255 | } | ||
256 | |||
257 | /* make sure we got some cut positions out of all that */ | ||
258 | if (nlists == 0) | ||
259 | bb_error_msg_and_die("missing list of positions"); | ||
260 | |||
261 | /* now that the lists are parsed, we need to sort them to make life | ||
262 | * easier on us when it comes time to print the chars / fields / lines | ||
263 | */ | ||
264 | qsort(cut_lists, nlists, sizeof(struct cut_list), cmpfunc); | ||
265 | } | ||
266 | |||
267 | /* argv[0..argc-1] should be names of file to process. If no | ||
268 | * files were specified or '-' was specified, take input from stdin. | ||
269 | * Otherwise, we process all the files specified. */ | ||
270 | if (argv[0] == NULL || LONE_DASH(argv[0])) { | ||
271 | cut_file(stdin); | ||
272 | } else { | ||
273 | FILE *file; | ||
274 | |||
275 | do { | ||
276 | file = fopen_or_warn(argv[0], "r"); | ||
277 | if (file) { | ||
278 | cut_file(file); | ||
279 | fclose(file); | ||
280 | } | ||
281 | } while (*++argv); | ||
282 | } | ||
283 | if (ENABLE_FEATURE_CLEAN_UP) | ||
284 | free(cut_lists); | ||
285 | return EXIT_SUCCESS; | ||
286 | } |