1 /* vi: set sw=4 ts=4: */
3 * cut.c - minimalist version of cut
5 * Copyright (C) 1999,2000,2001 by Lineo, inc.
6 * Written by Mark Whitley <markw@codepoet.org>
7 * debloated by Bernhard Fischer
9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
14 /* This is a NOEXEC applet. Be very careful! */
18 static const char optstring[] ALIGN1 = "b:c:f:d:sn";
19 #define CUT_OPT_BYTE_FLGS (1<<0)
20 #define CUT_OPT_CHAR_FLGS (1<<1)
21 #define CUT_OPT_FIELDS_FLGS (1<<2)
22 #define CUT_OPT_DELIM_FLGS (1<<3)
23 #define CUT_OPT_SUPPRESS_FLGS (1<<4)
25 static char delim = '\t'; /* delimiter, default is tab */
38 /* growable array holding a series of lists */
39 static struct cut_list *cut_lists;
40 static unsigned int nlists; /* number of elements in above list */
43 static int cmpfunc(const void *a, const void *b)
45 return (((struct cut_list *) a)->startpos -
46 ((struct cut_list *) b)->startpos);
50 static void cut_file(FILE * file)
53 unsigned int linenum = 0; /* keep these zero-based to be consistent */
55 /* go through every line in the file */
56 while ((line = xmalloc_getline(file)) != NULL) {
58 /* set up a list so we can keep track of what's been printed */
59 char * printed = xzalloc(strlen(line) * sizeof(char));
60 char * orig_line = line;
61 unsigned int cl_pos = 0;
64 /* cut based on chars/bytes XXX: only works when sizeof(char) == byte */
65 if (option_mask32 & (CUT_OPT_CHAR_FLGS | CUT_OPT_BYTE_FLGS)) {
66 /* print the chars specified in each cut list */
67 for (; cl_pos < nlists; cl_pos++) {
68 spos = cut_lists[cl_pos].startpos;
69 while (spos < strlen(line)) {
75 if (spos > cut_lists[cl_pos].endpos
76 || cut_lists[cl_pos].endpos == NON_RANGE)
80 } else if (delim == '\n') { /* cut by lines */
81 spos = cut_lists[cl_pos].startpos;
83 /* get out if we have no more lists to process or if the lines
84 * are lower than what we're interested in */
85 if (linenum < spos || cl_pos >= nlists)
88 /* if the line we're looking for is lower than the one we were
89 * passed, it means we displayed it already, so move on */
90 while (spos < linenum) {
92 /* go to the next list if we're at the end of this one */
93 if (spos > cut_lists[cl_pos].endpos
94 || cut_lists[cl_pos].endpos == NON_RANGE) {
96 /* get out if there's no more lists to process */
99 spos = cut_lists[cl_pos].startpos;
100 /* get out if the current line is lower than the one
101 * we just became interested in */
107 /* If we made it here, it means we've found the line we're
108 * looking for, so print it */
111 } else { /* cut by fields */
112 int ndelim = -1; /* zero-based / one-based problem */
113 int nfields_printed = 0;
115 const char delimiter[2] = { delim, 0 };
117 /* does this line contain any delimiters? */
118 if (strchr(line, delim) == NULL) {
119 if (!(option_mask32 & CUT_OPT_SUPPRESS_FLGS))
124 /* process each list on this line, for as long as we've got
125 * a line to process */
126 for (; cl_pos < nlists && line; cl_pos++) {
127 spos = cut_lists[cl_pos].startpos;
129 /* find the field we're looking for */
130 while (line && ndelim < spos) {
131 field = strsep(&line, delimiter);
135 /* we found it, and it hasn't been printed yet */
136 if (field && ndelim == spos && !printed[ndelim]) {
137 /* if this isn't our first time through, we need to
138 * print the delimiter after the last field that was
140 if (nfields_printed > 0)
142 fputs(field, stdout);
143 printed[ndelim] = 'X';
144 nfields_printed++; /* shouldn't overflow.. */
149 /* keep going as long as we have a line to work with,
150 * this is a list, and we're not at the end of that
152 } while (spos <= cut_lists[cl_pos].endpos && line
153 && cut_lists[cl_pos].endpos != NON_RANGE);
156 /* if we printed anything at all, we need to finish it with a
157 * newline cuz we were handed a chomped line */
166 static const char _op_on_field[] ALIGN1 = " only when operating on fields";
168 int cut_main(int argc, char **argv);
169 int cut_main(int argc, char **argv)
173 opt_complementary = "b--bcf:c--bcf:f--bcf";
174 getopt32(argv, optstring, &sopt, &sopt, &sopt, <ok);
177 if (!(option_mask32 & (CUT_OPT_BYTE_FLGS | CUT_OPT_CHAR_FLGS | CUT_OPT_FIELDS_FLGS)))
178 bb_error_msg_and_die("expected a list of bytes, characters, or fields");
180 if (option_mask32 & CUT_OPT_DELIM_FLGS) {
181 if (strlen(ltok) > 1) {
182 bb_error_msg_and_die("the delimiter must be a single character");
187 /* non-field (char or byte) cutting has some special handling */
188 if (!(option_mask32 & CUT_OPT_FIELDS_FLGS)) {
189 if (option_mask32 & CUT_OPT_SUPPRESS_FLGS) {
191 ("suppressing non-delimited lines makes sense%s",
196 ("a delimiter may be specified%s", _op_on_field);
201 * parse list and put values into startpos and endpos.
202 * valid list formats: N, N-, N-M, -M
203 * more than one list can be separated by commas
209 /* take apart the lists, one by one (they are separated with commas */
210 while ((ltok = strsep(&sopt, ",")) != NULL) {
212 /* it's actually legal to pass an empty list */
213 if (strlen(ltok) == 0)
216 /* get the start pos */
217 ntok = strsep(<ok, "-");
220 ("internal error: ntok is null for start pos!?\n");
221 } else if (strlen(ntok) == 0) {
225 /* account for the fact that arrays are zero based, while
226 * the user expects the first char on the line to be char #1 */
231 /* get the end pos */
232 ntok = strsep(<ok, "-");
235 } else if (strlen(ntok) == 0) {
239 /* if the user specified and end position of 0, that means "til the
243 e--; /* again, arrays are zero based, lines are 1 based */
248 /* if there's something left to tokenize, the user passed
251 bb_error_msg_and_die("invalid byte or field list");
253 /* add the new list */
254 cut_lists = xrealloc(cut_lists, sizeof(struct cut_list) * (++nlists));
255 cut_lists[nlists-1].startpos = s;
256 cut_lists[nlists-1].endpos = e;
259 /* make sure we got some cut positions out of all that */
261 bb_error_msg_and_die("missing list of positions");
263 /* now that the lists are parsed, we need to sort them to make life
264 * easier on us when it comes time to print the chars / fields / lines
266 qsort(cut_lists, nlists, sizeof(struct cut_list), cmpfunc);
269 /* argv[0..argc-1] should be names of file to process. If no
270 * files were specified or '-' was specified, take input from stdin.
271 * Otherwise, we process all the files specified. */
272 if (argv[0] == NULL || LONE_DASH(argv[0])) {
278 file = fopen_or_warn(argv[0], "r");
285 if (ENABLE_FEATURE_CLEAN_UP)