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 source tree.
11 * See SuS3 sort standard at:
12 * http://www.opengroup.org/onlinepubs/007904975/utilities/sort.html
15 //usage:#define sort_trivial_usage
17 //usage: IF_FEATURE_SORT_BIG("gMcszbdfiokt] [-o FILE] [-k start[.offset][opts][,end[.offset][opts]] [-t CHAR")
18 //usage: "] [FILE]..."
19 //usage:#define sort_full_usage "\n\n"
20 //usage: "Sort lines of text\n"
21 //usage: IF_FEATURE_SORT_BIG(
22 //usage: "\n -o FILE Output to FILE"
23 //usage: "\n -c Check whether input is sorted"
24 //usage: "\n -b Ignore leading blanks"
25 //usage: "\n -f Ignore case"
26 //usage: "\n -i Ignore unprintable characters"
27 //usage: "\n -d Dictionary order (blank or alphanumeric only)"
28 //usage: "\n -g General numerical sort"
29 //usage: "\n -M Sort month"
31 //-h, --human-numeric-sort: compare human readable numbers (e.g., 2K 1G)
32 //usage: "\n -n Sort numbers"
33 //usage: IF_FEATURE_SORT_BIG(
34 //usage: "\n -t CHAR Field separator"
35 //usage: "\n -k N[,M] Sort by Nth field"
37 //usage: "\n -r Reverse sort order"
38 //usage: IF_FEATURE_SORT_BIG(
39 //usage: "\n -s Stable (don't sort ties alphabetically)"
41 //usage: "\n -u Suppress duplicate lines"
42 //usage: IF_FEATURE_SORT_BIG(
43 //usage: "\n -z Lines are terminated by NUL, not newline"
44 ////usage: "\n -m Ignored for GNU compatibility"
45 ////usage: "\n -S BUFSZ Ignored for GNU compatibility"
46 ////usage: "\n -T TMPDIR Ignored for GNU compatibility"
49 //usage:#define sort_example_usage
50 //usage: "$ echo -e \"e\\nf\\nb\\nd\\nc\\na\" | sort\n"
57 //usage: IF_FEATURE_SORT_BIG(
58 //usage: "$ echo -e \"c 3\\nb 2\\nd 2\" | $SORT -k 2,2n -k 1,1r\n"
67 /* This is a NOEXEC applet. Be very careful! */
71 sort [-m][-o output][-bdfinru][-t char][-k keydef]... [file...]
72 sort -c [-bdfinru][-t char][-k keydef][file]
75 /* These are sort types */
76 static const char OPT_STR[] ALIGN1 = "ngMucszbrdfimS:T:o:k:t:";
78 FLAG_n = 1, /* Numeric sort */
79 FLAG_g = 2, /* Sort using strtod() */
80 FLAG_M = 4, /* Sort date */
81 /* ucsz apply to root level only, not keys. b at root level implies bb */
82 FLAG_u = 8, /* Unique */
83 FLAG_c = 0x10, /* Check: no output, exit(!ordered) */
84 FLAG_s = 0x20, /* Stable sort, no ascii fallback at end */
85 FLAG_z = 0x40, /* Input and output is NUL terminated, not \n */
86 /* These can be applied to search keys, the previous four can't */
87 FLAG_b = 0x80, /* Ignore leading blanks */
88 FLAG_r = 0x100, /* Reverse */
89 FLAG_d = 0x200, /* Ignore !(isalnum()|isspace()) */
90 FLAG_f = 0x400, /* Force uppercase */
91 FLAG_i = 0x800, /* Ignore !isprint() */
92 FLAG_m = 0x1000, /* ignored: merge already sorted files; do not sort */
93 FLAG_S = 0x2000, /* ignored: -S, --buffer-size=SIZE */
94 FLAG_T = 0x4000, /* ignored: -T, --temporary-directory=DIR */
98 FLAG_bb = 0x80000000, /* Ignore trailing blanks */
101 #if ENABLE_FEATURE_SORT_BIG
102 static char key_separator;
104 static struct sort_key {
105 struct sort_key *next_key; /* linked list */
106 unsigned range[4]; /* start word, start char, end word, end char */
110 static char *get_key(char *str, struct sort_key *key, int flags)
112 int start = start; /* for compiler */
117 /* Special case whole string, so we don't have to make a copy */
118 if (key->range[0] == 1 && !key->range[1] && !key->range[2] && !key->range[3]
119 && !(flags & (FLAG_b | FLAG_d | FLAG_f | FLAG_i | FLAG_bb))
124 /* Find start of key on first pass, end on second pass */
126 for (j = 0; j < 2; j++) {
127 if (!key->range[2*j])
129 /* Loop through fields */
131 unsigned char ch = 0;
134 for (i = 1; i < key->range[2*j] + j; i++) {
136 /* Skip body of key and separator */
137 while ((ch = str[end]) != '\0') {
139 if (ch == key_separator)
143 /* Skip leading blanks */
144 while (isspace(str[end]))
146 /* Skip body of key */
147 while (str[end] != '\0') {
148 if (isspace(str[end]))
154 /* Remove last delim: "abc:def:" => "abc:def" */
156 //if (str[end-1] != key_separator)
157 // bb_error_msg(_and_die("BUG! "
158 // "str[start:%d,end:%d]:'%.*s'",
159 // start, end, (int)(end-start), &str[start]);
165 /* Strip leading whitespace if necessary */
167 /* not using skip_whitespace() for speed */
168 while (isspace(str[start])) start++;
169 /* Strip trailing whitespace if necessary */
171 while (end > start && isspace(str[end-1])) end--;
172 /* -kSTART,N.ENDCHAR: honor ENDCHAR (1-based) */
175 if (end > len) end = len;
177 /* -kN.STARTCHAR[,...]: honor STARTCHAR (1-based) */
179 start += key->range[1] - 1;
180 if (start > len) start = len;
185 str = xstrndup(str+start, end-start);
187 if (flags & FLAG_d) {
188 for (start = end = 0; str[end]; end++)
189 if (isspace(str[end]) || isalnum(str[end]))
190 str[start++] = str[end];
194 if (flags & FLAG_i) {
195 for (start = end = 0; str[end]; end++)
196 if (isprint_asciionly(str[end]))
197 str[start++] = str[end];
202 for (i = 0; str[i]; i++)
203 str[i] = toupper(str[i]);
208 static struct sort_key *add_key(void)
210 struct sort_key **pkey = &key_list;
212 pkey = &((*pkey)->next_key);
213 return *pkey = xzalloc(sizeof(struct sort_key));
216 #define GET_LINE(fp) \
217 ((option_mask32 & FLAG_z) \
218 ? bb_get_chunk_from_file(fp, NULL) \
219 : xmalloc_fgetline(fp))
221 #define GET_LINE(fp) xmalloc_fgetline(fp)
224 /* Iterate through keys list and perform comparisons */
225 static int compare_keys(const void *xarg, const void *yarg)
227 int flags = option_mask32, retval = 0;
230 #if ENABLE_FEATURE_SORT_BIG
231 struct sort_key *key;
233 for (key = key_list; !retval && key; key = key->next_key) {
234 flags = key->flags ? key->flags : option_mask32;
235 /* Chop out and modify key chunks, handling -dfib */
236 x = get_key(*(char **)xarg, key, flags);
237 y = get_key(*(char **)yarg, key, flags);
239 /* This curly bracket serves no purpose but to match the nesting
240 * level of the for () loop we're not using */
245 /* Perform actual comparison */
246 switch (flags & (FLAG_n | FLAG_M | FLAG_g)) {
248 bb_error_msg_and_die("unknown sort type");
252 #if ENABLE_LOCALE_SUPPORT
253 retval = strcoll(x, y);
255 retval = strcmp(x, y);
258 #if ENABLE_FEATURE_SORT_BIG
261 double dx = strtod(x, &xx);
262 double dy = strtod(y, &yy);
263 /* not numbers < NaN < -infinity < numbers < +infinity) */
265 retval = (y == yy ? 0 : -1);
268 /* Check for isnan */
270 retval = (dy != dy) ? 0 : -1;
273 /* Check for infinity. Could underflow, but it avoids libm. */
274 else if (1.0 / dx == 0.0) {
276 retval = (1.0 / dy == 0.0 && dy < 0) ? 0 : -1;
278 retval = (1.0 / dy == 0.0 && dy > 0) ? 0 : 1;
279 } else if (1.0 / dy == 0.0)
280 retval = (dy < 0) ? 1 : -1;
282 retval = (dx > dy) ? 1 : ((dx < dy) ? -1 : 0);
290 xx = strptime(x, "%b", &thyme);
292 yy = strptime(y, "%b", &thyme);
294 retval = (!yy) ? 0 : -1;
298 retval = dx - thyme.tm_mon;
301 /* Full floating point version of -n */
305 retval = (dx > dy) ? 1 : ((dx < dy) ? -1 : 0);
309 /* Free key copies. */
310 if (x != *(char **)xarg) free(x);
311 if (y != *(char **)yarg) free(y);
312 /* if (retval) break; - done by for () anyway */
314 /* Integer version of -n for tiny systems */
316 retval = atoi(x) - atoi(y);
322 /* Perform fallback sort if necessary */
323 if (!retval && !(option_mask32 & FLAG_s)) {
324 flags = option_mask32;
325 retval = strcmp(*(char **)xarg, *(char **)yarg);
334 #if ENABLE_FEATURE_SORT_BIG
335 static unsigned str2u(char **str)
338 if (!isdigit((*str)[0]))
339 bb_error_msg_and_die("bad field specification");
340 lu = strtoul(*str, str, 10);
341 if ((sizeof(long) > sizeof(int) && lu > INT_MAX) || !lu)
342 bb_error_msg_and_die("bad field specification");
347 int sort_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
348 int sort_main(int argc UNUSED_PARAM, char **argv)
351 char *str_ignored, *str_o, *str_t;
352 llist_t *lst_k = NULL;
357 xfunc_error_retval = 2;
359 /* Parse command line options */
360 /* -o and -t can be given at most once */
361 opt_complementary = "o--o:t--t:" /* -t, -o: at most one of each */
362 "k::"; /* -k takes list */
363 opts = getopt32(argv, OPT_STR, &str_ignored, &str_ignored, &str_o, &lst_k, &str_t);
364 /* global b strips leading and trailing spaces */
366 option_mask32 |= FLAG_bb;
367 #if ENABLE_FEATURE_SORT_BIG
369 if (!str_t[0] || str_t[1])
370 bb_error_msg_and_die("bad -t parameter");
371 key_separator = str_t[0];
373 /* note: below this point we use option_mask32, not opts,
374 * since that reduces register pressure and makes code smaller */
380 FLAG_n | /* Numeric sort */
381 FLAG_g | /* Sort using strtod() */
382 FLAG_M | /* Sort date */
383 FLAG_b | /* Ignore leading blanks */
384 FLAG_r | /* Reverse */
385 FLAG_d | /* Ignore !(isalnum()|isspace()) */
386 FLAG_f | /* Force uppercase */
387 FLAG_i | /* Ignore !isprint() */
390 struct sort_key *key = add_key();
391 char *str_k = llist_pop(&lst_k);
393 i = 0; /* i==0 before comma, 1 after (-k3,6) */
396 /* Cannot use bb_strtou - suffix can be a letter */
397 key->range[2*i] = str2u(&str_k);
400 key->range[2*i+1] = str2u(&str_k);
406 if (*str_k == ',' && !i++) {
409 } /* no else needed: fall through to syntax error
410 because comma isn't in OPT_STR */
411 idx = strchr(OPT_STR, *str_k);
413 bb_error_msg_and_die("unknown key option");
414 flag = 1 << (idx - OPT_STR);
415 if (flag & ~FLAG_allowed_for_k)
416 bb_error_msg_and_die("unknown sort type");
417 /* b after ',' means strip _trailing_ space */
418 if (i && flag == FLAG_b)
427 /* Open input files and read data */
430 *--argv = (char*)"-";
434 /* coreutils 6.9 compat: abort on first open error,
435 * do not continue to next file: */
436 FILE *fp = xfopen_stdin(*argv);
441 lines = xrealloc_vector(lines, 6, linecount);
442 lines[linecount++] = line;
444 fclose_if_not_stdin(fp);
447 #if ENABLE_FEATURE_SORT_BIG
448 /* If no key, perform alphabetic sort */
450 add_key()->range[0] = 1;
452 if (option_mask32 & FLAG_c) {
453 int j = (option_mask32 & FLAG_u) ? -1 : 0;
454 for (i = 1; i < linecount; i++) {
455 if (compare_keys(&lines[i-1], &lines[i]) > j) {
456 fprintf(stderr, "Check line %u\n", i);
463 /* Perform the actual sort */
464 qsort(lines, linecount, sizeof(lines[0]), compare_keys);
467 if (option_mask32 & FLAG_u) {
469 /* coreutils 6.3 drop lines for which only key is the same */
470 /* -- disabling last-resort compare... */
471 option_mask32 |= FLAG_s;
472 for (i = 1; i < linecount; i++) {
473 if (compare_keys(&lines[j], &lines[i]) == 0)
476 lines[++j] = lines[i];
483 #if ENABLE_FEATURE_SORT_BIG
484 /* Open output file _after_ we read all input ones */
485 if (option_mask32 & FLAG_o)
486 xmove_fd(xopen(str_o, O_WRONLY|O_CREAT|O_TRUNC), STDOUT_FILENO);
489 int ch = (option_mask32 & FLAG_z) ? '\0' : '\n';
490 for (i = 0; i < linecount; i++)
491 printf("%s%c", lines[i], ch);
494 fflush_stdout_and_exit(EXIT_SUCCESS);