aboutsummaryrefslogtreecommitdiff
path: root/coreutils/sort.c
blob: c7abc3355124db63c4cf1cad67e1be11426c145c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
/* vi: set sw=4 ts=4: */
/*
 * SuS3 compliant sort implementation for busybox
 *
 * Copyright (C) 2004 by Rob Landley <rob@landley.net>
 *
 * MAINTAINER: Rob Landley <rob@landley.net>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 *
 * See SuS3 sort standard at:
 * http://www.opengroup.org/onlinepubs/007904975/utilities/sort.html
 */

#include "busybox.h"

/*
	sort [-m][-o output][-bdfinru][-t char][-k keydef]... [file...]
	sort -c [-bdfinru][-t char][-k keydef][file]
*/

/* These are sort types */
static const char OPT_STR[] = "ngMucszbrdfimS:T:o:k:t:";
enum {
	FLAG_n  = 1,            /* Numeric sort */
	FLAG_g  = 2,            /* Sort using strtod() */
	FLAG_M  = 4,            /* Sort date */
/* ucsz apply to root level only, not keys.  b at root level implies bb */
	FLAG_u  = 8,            /* Unique */
	FLAG_c  = 0x10,         /* Check: no output, exit(!ordered) */
	FLAG_s  = 0x20,         /* Stable sort, no ascii fallback at end */
	FLAG_z  = 0x40,         /* Input is null terminated, not \n */
/* These can be applied to search keys, the previous four can't */
	FLAG_b  = 0x80,         /* Ignore leading blanks */
	FLAG_r  = 0x100,        /* Reverse */
	FLAG_d  = 0x200,        /* Ignore !(isalnum()|isspace()) */
	FLAG_f  = 0x400,        /* Force uppercase */
	FLAG_i  = 0x800,        /* Ignore !isprint() */
	FLAG_m  = 0x1000,       /* ignored: merge already sorted files; do not sort */
	FLAG_S  = 0x2000,       /* ignored: -S, --buffer-size=SIZE */
	FLAG_T  = 0x4000,       /* ignored: -T, --temporary-directory=DIR */
	FLAG_o  = 0x8000,
	FLAG_k  = 0x10000,
	FLAG_t  = 0x20000,
	FLAG_bb = 0x80000000,   /* Ignore trailing blanks  */
};

#if ENABLE_FEATURE_SORT_BIG
static char key_separator;

static struct sort_key {
	struct sort_key *next_key;	/* linked list */
	unsigned range[4];	/* start word, start char, end word, end char */
	unsigned flags;
} *key_list;

static char *get_key(char *str, struct sort_key *key, int flags)
{
	int start = 0, end = 0, len, i, j;

	/* Special case whole string, so we don't have to make a copy */
	if (key->range[0] == 1 && !key->range[1] && !key->range[2] && !key->range[3]
	 && !(flags & (FLAG_b | FLAG_d | FLAG_f | FLAG_i | FLAG_bb))
	) {
		return str;
	}

	/* Find start of key on first pass, end on second pass */
	len = strlen(str);
	for (j = 0; j < 2; j++) {
		if (!key->range[2*j])
			end = len;
		/* Loop through fields */
		else {
			end = 0;
			for (i = 1; i < key->range[2*j] + j; i++) {
				if (key_separator) {
					/* Skip first separator */
					while (str[end] == key_separator)
						end++;
					/* Skip body of key */
					while (str[end]) {
						if (str[end] == key_separator)
							break;
						end++;
					}
				} else {
					/* Skip leading blanks */
					while (isspace(str[end]))
						end++;
					/* Skip body of key */
					while (str[end]) {
						if (isspace(str[end]))
							break;
						end++;
					}
				}
			}
		}
		if (!j) start = end;
	}
	/* Key with explicit separator starts after separator */
	if (key_separator && str[start] == key_separator)
		start++;
	/* Strip leading whitespace if necessary */
//XXX: skip_whitespace()
	if (flags & FLAG_b)
		while (isspace(str[start])) start++;
	/* Strip trailing whitespace if necessary */
	if (flags & FLAG_bb)
		while (end > start && isspace(str[end-1])) end--;
	/* Handle offsets on start and end */
	if (key->range[3]) {
		end += key->range[3] - 1;
		if (end > len) end = len;
	}
	if (key->range[1]) {
		start += key->range[1] - 1;
		if (start > len) start = len;
	}
	/* Make the copy */
	if (end < start) end = start;
	str = xstrndup(str+start, end-start);
	/* Handle -d */
	if (flags & FLAG_d) {
		for (start = end = 0; str[end]; end++)
			if (isspace(str[end]) || isalnum(str[end]))
				str[start++] = str[end];
		str[start] = '\0';
	}
	/* Handle -i */
	if (flags & FLAG_i) {
		for (start = end = 0; str[end]; end++)
			if (isprint(str[end]))
				str[start++] = str[end];
		str[start] = '\0';
	}
	/* Handle -f */
	if (flags & FLAG_f)
		for (i = 0; str[i]; i++)
			str[i] = toupper(str[i]);

	return str;
}

static struct sort_key *add_key(void)
{
	struct sort_key **pkey = &key_list;
	while (*pkey)
		pkey = &((*pkey)->next_key);
	return *pkey = xzalloc(sizeof(struct sort_key));
}

#define GET_LINE(fp) \
	((option_mask32 & FLAG_z) \
	? bb_get_chunk_from_file(fp, NULL) \
	: xmalloc_getline(fp))
#else
#define GET_LINE(fp) xmalloc_getline(fp)
#endif

/* Iterate through keys list and perform comparisons */
static int compare_keys(const void *xarg, const void *yarg)
{
	int flags = option_mask32, retval = 0;
	char *x, *y;

#if ENABLE_FEATURE_SORT_BIG
	struct sort_key *key;

	for (key = key_list; !retval && key; key = key->next_key) {
		flags = key->flags ? key->flags : option_mask32;
		/* Chop out and modify key chunks, handling -dfib */
		x = get_key(*(char **)xarg, key, flags);
		y = get_key(*(char **)yarg, key, flags);
#else
	/* This curly bracket serves no purpose but to match the nesting
	   level of the for () loop we're not using */
	{
		x = *(char **)xarg;
		y = *(char **)yarg;
#endif
		/* Perform actual comparison */
		switch (flags & 7) {
		default:
			bb_error_msg_and_die("unknown sort type");
			break;
		/* Ascii sort */
		case 0:
#if ENABLE_LOCALE_SUPPORT
			retval = strcoll(x, y);
#else
			retval = strcmp(x, y);
#endif
			break;
#if ENABLE_FEATURE_SORT_BIG
		case FLAG_g: {
			char *xx, *yy;
			double dx = strtod(x, &xx);
			double dy = strtod(y, &yy);
			/* not numbers < NaN < -infinity < numbers < +infinity) */
			if (x == xx)
				retval = (y == yy ? 0 : -1);
			else if (y == yy)
				retval = 1;
			/* Check for isnan */
			else if (dx != dx)
				retval = (dy != dy) ? 0 : -1;
			else if (dy != dy)
				retval = 1;
			/* Check for infinity.  Could underflow, but it avoids libm. */
			else if (1.0 / dx == 0.0) {
				if (dx < 0)
					retval = (1.0 / dy == 0.0 && dy < 0) ? 0 : -1;
				else
					retval = (1.0 / dy == 0.0 && dy > 0) ? 0 : 1;
			} else if (1.0 / dy == 0.0)
				retval = (dy < 0) ? 1 : -1;
			else
				retval = (dx > dy) ? 1 : ((dx < dy) ? -1 : 0);
			break;
		}
		case FLAG_M: {
			struct tm thyme;
			int dx;
			char *xx, *yy;

			xx = strptime(x, "%b", &thyme);
			dx = thyme.tm_mon;
			yy = strptime(y, "%b", &thyme);
			if (!xx)
				retval = (!yy) ? 0 : -1;
			else if (!yy)
				retval = 1;
			else
				retval = (dx == thyme.tm_mon) ? 0 : dx - thyme.tm_mon;
			break;
		}
		/* Full floating point version of -n */
		case FLAG_n: {
			double dx = atof(x);
			double dy = atof(y);
			retval = (dx > dy) ? 1 : ((dx < dy) ? -1 : 0);
			break;
		}
		} /* switch */
		/* Free key copies. */
		if (x != *(char **)xarg) free(x);
		if (y != *(char **)yarg) free(y);
		/* if (retval) break; - done by for () anyway */
#else
		/* Integer version of -n for tiny systems */
		case FLAG_n:
			retval = atoi(x) - atoi(y);
			break;
		} /* switch */
#endif
	} /* for */

	/* Perform fallback sort if necessary */
	if (!retval && !(option_mask32 & FLAG_s))
		retval = strcmp(*(char **)xarg, *(char **)yarg);

	if (flags & FLAG_r) return -retval;
	return retval;
}

#if ENABLE_FEATURE_SORT_BIG
static unsigned str2u(char **str)
{
	unsigned long lu;
	if (!isdigit((*str)[0]))
		bb_error_msg_and_die("bad field specification");
	lu = strtoul(*str, str, 10);
	if ((sizeof(long) > sizeof(int) && lu > INT_MAX) || !lu)
		bb_error_msg_and_die("bad field specification");
	return lu;
}
#endif

int sort_main(int argc, char **argv)
{
	FILE *fp, *outfile = stdout;
	char *line, **lines = NULL;
	char *str_ignored, *str_o, *str_k, *str_t;
	int i, flag;
	int linecount = 0;

	xfunc_error_retval = 2;

	/* Parse command line options */
	/* -o and -t can be given at most once */
	opt_complementary = "?:o--o:t--t";
	getopt32(argc, argv, OPT_STR, &str_ignored, &str_ignored, &str_o, &str_k, &str_t);
#if ENABLE_FEATURE_SORT_BIG
	if (option_mask32 & FLAG_o) outfile = xfopen(str_o, "w");
	if (option_mask32 & FLAG_t) {
		if (!str_t[0] || str_t[1])
			bb_error_msg_and_die("bad -t parameter");
		key_separator = str_t[0];
	}
	/* parse sort key */
	if (option_mask32 & FLAG_k) {
		enum {
			FLAG_allowed_for_k =
				FLAG_n | /* Numeric sort */
				FLAG_g | /* Sort using strtod() */
				FLAG_M | /* Sort date */
				FLAG_b | /* Ignore leading blanks */
				FLAG_r | /* Reverse */
				FLAG_d | /* Ignore !(isalnum()|isspace()) */
				FLAG_f | /* Force uppercase */
				FLAG_i | /* Ignore !isprint() */
			0
		};
		struct sort_key *key = add_key();
		const char *temp2;

		i = 0; /* i==0 before comma, 1 after (-k3,6) */
		while (*str_k) {
			/* Start of range */
			/* Cannot use bb_strtou - suffix can be a letter */
			key->range[2*i] = str2u(&str_k);
			if (*str_k == '.') {
				str_k++;
				key->range[2*i+1] = str2u(&str_k);
			}
			while (*str_k) {
				if (*str_k == ',' && !i++) {
					str_k++;
					break;
				} /* no else needed: fall through to syntax error
					 because comma isn't in OPT_STR */
				temp2 = strchr(OPT_STR, *str_k);
				if (!temp2)
					bb_error_msg_and_die("unknown key option");
				flag = 1 << (temp2 - OPT_STR);
				if (flag & ~FLAG_allowed_for_k)
					bb_error_msg_and_die("unknown sort type");
				/* b after ',' means strip _trailing_ space */
				if (i && flag == FLAG_b) flag = FLAG_bb;
				key->flags |= flag;
				str_k++;
			}
		}
	}
#endif
	/* global b strips leading and trailing spaces */
	if (option_mask32 & FLAG_b) option_mask32 |= FLAG_bb;

	/* Open input files and read data */
	for (i = argv[optind] ? optind : optind-1; argv[i]; i++) {
		fp = stdin;
		if (i >= optind && NOT_LONE_DASH(argv[i]))
			fp = xfopen(argv[i], "r");
		for (;;) {
			line = GET_LINE(fp);
			if (!line) break;
			if (!(linecount & 63))
				lines = xrealloc(lines, sizeof(char *) * (linecount + 64));
			lines[linecount++] = line;
		}
		fclose(fp);
	}
#if ENABLE_FEATURE_SORT_BIG
	/* if no key, perform alphabetic sort */
	if (!key_list)
		add_key()->range[0] = 1;
	/* handle -c */
	if (option_mask32 & FLAG_c) {
		int j = (option_mask32 & FLAG_u) ? -1 : 0;
		for (i = 1; i < linecount; i++)
			if (compare_keys(&lines[i-1], &lines[i]) > j) {
				fprintf(stderr, "Check line %d\n", i);
				return 1;
			}
		return 0;
	}
#endif
	/* Perform the actual sort */
	qsort(lines, linecount, sizeof(char *), compare_keys);
	/* handle -u */
	if (option_mask32 & FLAG_u) {
		flag = 0;
		/* coreutils 6.3 drop lines for which only key is the same */
		/* -- disabling last-resort compare... */
		option_mask32 |= FLAG_s;
		for (i = 1; i < linecount; i++) {
			if (!compare_keys(&lines[flag], &lines[i]))
				free(lines[i]);
			else
				lines[++flag] = lines[i];
		}
		if (linecount) linecount = flag+1;
	}
	/* Print it */
	for (i = 0; i < linecount; i++)
		fprintf(outfile, "%s\n", lines[i]);

	fflush_stdout_and_exit(EXIT_SUCCESS);
}