1 /* vi: set sw=4 ts=4: */
3 * SuS3 compliant sort implementation for busybox
5 * Copyright (C) 2004 by Rob Landley <rob@landley.net>
7 * MAINTAINER: Rob Landley <rob@landley.net>
9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
11 * See SuS3 sort standard at:
12 * http://www.opengroup.org/onlinepubs/007904975/utilities/sort.html
17 /* This is a NOEXEC applet. Be very careful! */
21 sort [-m][-o output][-bdfinru][-t char][-k keydef]... [file...]
22 sort -c [-bdfinru][-t char][-k keydef][file]
25 /* These are sort types */
26 static const char OPT_STR[] ALIGN1 = "ngMucszbrdfimS:T:o:k:t:";
28 FLAG_n = 1, /* Numeric sort */
29 FLAG_g = 2, /* Sort using strtod() */
30 FLAG_M = 4, /* Sort date */
31 /* ucsz apply to root level only, not keys. b at root level implies bb */
32 FLAG_u = 8, /* Unique */
33 FLAG_c = 0x10, /* Check: no output, exit(!ordered) */
34 FLAG_s = 0x20, /* Stable sort, no ascii fallback at end */
35 FLAG_z = 0x40, /* Input is null terminated, not \n */
36 /* These can be applied to search keys, the previous four can't */
37 FLAG_b = 0x80, /* Ignore leading blanks */
38 FLAG_r = 0x100, /* Reverse */
39 FLAG_d = 0x200, /* Ignore !(isalnum()|isspace()) */
40 FLAG_f = 0x400, /* Force uppercase */
41 FLAG_i = 0x800, /* Ignore !isprint() */
42 FLAG_m = 0x1000, /* ignored: merge already sorted files; do not sort */
43 FLAG_S = 0x2000, /* ignored: -S, --buffer-size=SIZE */
44 FLAG_T = 0x4000, /* ignored: -T, --temporary-directory=DIR */
48 FLAG_bb = 0x80000000, /* Ignore trailing blanks */
51 #if ENABLE_FEATURE_SORT_BIG
52 static char key_separator;
54 static struct sort_key {
55 struct sort_key *next_key; /* linked list */
56 unsigned range[4]; /* start word, start char, end word, end char */
60 static char *get_key(char *str, struct sort_key *key, int flags)
62 int start = 0, end = 0, len, i, j;
64 /* Special case whole string, so we don't have to make a copy */
65 if (key->range[0] == 1 && !key->range[1] && !key->range[2] && !key->range[3]
66 && !(flags & (FLAG_b | FLAG_d | FLAG_f | FLAG_i | FLAG_bb))
71 /* Find start of key on first pass, end on second pass */
73 for (j = 0; j < 2; j++) {
76 /* Loop through fields */
79 for (i = 1; i < key->range[2*j] + j; i++) {
81 /* Skip body of key and separator */
83 if (str[end++] == key_separator)
87 /* Skip leading blanks */
88 while (isspace(str[end]))
90 /* Skip body of key */
92 if (isspace(str[end]))
101 /* Strip leading whitespace if necessary */
102 //XXX: skip_whitespace()
104 while (isspace(str[start])) start++;
105 /* Strip trailing whitespace if necessary */
107 while (end > start && isspace(str[end-1])) end--;
108 /* Handle offsets on start and end */
110 end += key->range[3] - 1;
111 if (end > len) end = len;
114 start += key->range[1] - 1;
115 if (start > len) start = len;
118 if (end < start) end = start;
119 str = xstrndup(str+start, end-start);
121 if (flags & FLAG_d) {
122 for (start = end = 0; str[end]; end++)
123 if (isspace(str[end]) || isalnum(str[end]))
124 str[start++] = str[end];
128 if (flags & FLAG_i) {
129 for (start = end = 0; str[end]; end++)
130 if (isprint(str[end]))
131 str[start++] = str[end];
136 for (i = 0; str[i]; i++)
137 str[i] = toupper(str[i]);
142 static struct sort_key *add_key(void)
144 struct sort_key **pkey = &key_list;
146 pkey = &((*pkey)->next_key);
147 return *pkey = xzalloc(sizeof(struct sort_key));
150 #define GET_LINE(fp) \
151 ((option_mask32 & FLAG_z) \
152 ? bb_get_chunk_from_file(fp, NULL) \
153 : xmalloc_getline(fp))
155 #define GET_LINE(fp) xmalloc_getline(fp)
158 /* Iterate through keys list and perform comparisons */
159 static int compare_keys(const void *xarg, const void *yarg)
161 int flags = option_mask32, retval = 0;
164 #if ENABLE_FEATURE_SORT_BIG
165 struct sort_key *key;
167 for (key = key_list; !retval && key; key = key->next_key) {
168 flags = key->flags ? key->flags : option_mask32;
169 /* Chop out and modify key chunks, handling -dfib */
170 x = get_key(*(char **)xarg, key, flags);
171 y = get_key(*(char **)yarg, key, flags);
173 /* This curly bracket serves no purpose but to match the nesting
174 level of the for () loop we're not using */
179 /* Perform actual comparison */
182 bb_error_msg_and_die("unknown sort type");
186 #if ENABLE_LOCALE_SUPPORT
187 retval = strcoll(x, y);
189 retval = strcmp(x, y);
192 #if ENABLE_FEATURE_SORT_BIG
195 double dx = strtod(x, &xx);
196 double dy = strtod(y, &yy);
197 /* not numbers < NaN < -infinity < numbers < +infinity) */
199 retval = (y == yy ? 0 : -1);
202 /* Check for isnan */
204 retval = (dy != dy) ? 0 : -1;
207 /* Check for infinity. Could underflow, but it avoids libm. */
208 else if (1.0 / dx == 0.0) {
210 retval = (1.0 / dy == 0.0 && dy < 0) ? 0 : -1;
212 retval = (1.0 / dy == 0.0 && dy > 0) ? 0 : 1;
213 } else if (1.0 / dy == 0.0)
214 retval = (dy < 0) ? 1 : -1;
216 retval = (dx > dy) ? 1 : ((dx < dy) ? -1 : 0);
224 xx = strptime(x, "%b", &thyme);
226 yy = strptime(y, "%b", &thyme);
228 retval = (!yy) ? 0 : -1;
232 retval = (dx == thyme.tm_mon) ? 0 : dx - thyme.tm_mon;
235 /* Full floating point version of -n */
239 retval = (dx > dy) ? 1 : ((dx < dy) ? -1 : 0);
243 /* Free key copies. */
244 if (x != *(char **)xarg) free(x);
245 if (y != *(char **)yarg) free(y);
246 /* if (retval) break; - done by for () anyway */
248 /* Integer version of -n for tiny systems */
250 retval = atoi(x) - atoi(y);
256 /* Perform fallback sort if necessary */
257 if (!retval && !(option_mask32 & FLAG_s))
258 retval = strcmp(*(char **)xarg, *(char **)yarg);
260 if (flags & FLAG_r) return -retval;
264 #if ENABLE_FEATURE_SORT_BIG
265 static unsigned str2u(char **str)
268 if (!isdigit((*str)[0]))
269 bb_error_msg_and_die("bad field specification");
270 lu = strtoul(*str, str, 10);
271 if ((sizeof(long) > sizeof(int) && lu > INT_MAX) || !lu)
272 bb_error_msg_and_die("bad field specification");
277 int sort_main(int argc, char **argv);
278 int sort_main(int argc, char **argv)
280 FILE *fp, *outfile = stdout;
281 char *line, **lines = NULL;
282 char *str_ignored, *str_o, *str_t;
283 llist_t *lst_k = NULL;
287 xfunc_error_retval = 2;
289 /* Parse command line options */
290 /* -o and -t can be given at most once */
291 opt_complementary = "o--o:t--t:" /* -t, -o: maximum one of each */
292 "k::"; /* -k takes list */
293 getopt32(argv, OPT_STR, &str_ignored, &str_ignored, &str_o, &lst_k, &str_t);
294 #if ENABLE_FEATURE_SORT_BIG
295 if (option_mask32 & FLAG_o) outfile = xfopen(str_o, "w");
296 if (option_mask32 & FLAG_t) {
297 if (!str_t[0] || str_t[1])
298 bb_error_msg_and_die("bad -t parameter");
299 key_separator = str_t[0];
305 FLAG_n | /* Numeric sort */
306 FLAG_g | /* Sort using strtod() */
307 FLAG_M | /* Sort date */
308 FLAG_b | /* Ignore leading blanks */
309 FLAG_r | /* Reverse */
310 FLAG_d | /* Ignore !(isalnum()|isspace()) */
311 FLAG_f | /* Force uppercase */
312 FLAG_i | /* Ignore !isprint() */
315 struct sort_key *key = add_key();
316 char *str_k = lst_k->data;
319 i = 0; /* i==0 before comma, 1 after (-k3,6) */
322 /* Cannot use bb_strtou - suffix can be a letter */
323 key->range[2*i] = str2u(&str_k);
326 key->range[2*i+1] = str2u(&str_k);
329 if (*str_k == ',' && !i++) {
332 } /* no else needed: fall through to syntax error
333 because comma isn't in OPT_STR */
334 temp2 = strchr(OPT_STR, *str_k);
336 bb_error_msg_and_die("unknown key option");
337 flag = 1 << (temp2 - OPT_STR);
338 if (flag & ~FLAG_allowed_for_k)
339 bb_error_msg_and_die("unknown sort type");
340 /* b after ',' means strip _trailing_ space */
341 if (i && flag == FLAG_b) flag = FLAG_bb;
346 /* leaking lst_k... */
350 /* global b strips leading and trailing spaces */
351 if (option_mask32 & FLAG_b) option_mask32 |= FLAG_bb;
353 /* Open input files and read data */
354 for (i = argv[optind] ? optind : optind-1; argv[i]; i++) {
356 if (i >= optind && NOT_LONE_DASH(argv[i]))
357 fp = xfopen(argv[i], "r");
361 if (!(linecount & 63))
362 lines = xrealloc(lines, sizeof(char *) * (linecount + 64));
363 lines[linecount++] = line;
367 #if ENABLE_FEATURE_SORT_BIG
368 /* if no key, perform alphabetic sort */
370 add_key()->range[0] = 1;
372 if (option_mask32 & FLAG_c) {
373 int j = (option_mask32 & FLAG_u) ? -1 : 0;
374 for (i = 1; i < linecount; i++)
375 if (compare_keys(&lines[i-1], &lines[i]) > j) {
376 fprintf(stderr, "Check line %d\n", i);
382 /* Perform the actual sort */
383 qsort(lines, linecount, sizeof(char *), compare_keys);
385 if (option_mask32 & FLAG_u) {
387 /* coreutils 6.3 drop lines for which only key is the same */
388 /* -- disabling last-resort compare... */
389 option_mask32 |= FLAG_s;
390 for (i = 1; i < linecount; i++) {
391 if (!compare_keys(&lines[flag], &lines[i]))
394 lines[++flag] = lines[i];
396 if (linecount) linecount = flag+1;
399 for (i = 0; i < linecount; i++)
400 fprintf(outfile, "%s\n", lines[i]);
402 fflush_stdout_and_exit(EXIT_SUCCESS);