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("gMcszbdfimSTokt] [-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 -b Ignore leading blanks"
23 //usage: "\n -c Check whether input is sorted"
24 //usage: "\n -d Dictionary order (blank or alphanumeric only)"
25 //usage: "\n -f Ignore case"
26 //usage: "\n -g General numerical sort"
27 //usage: "\n -i Ignore unprintable characters"
28 //usage: "\n -k Sort key"
29 //usage: "\n -M Sort month"
31 //usage: "\n -n Sort numbers"
32 //usage: IF_FEATURE_SORT_BIG(
33 //usage: "\n -o Output to file"
34 //usage: "\n -k Sort by key"
35 //usage: "\n -t CHAR Key separator"
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 -mST Ignored for GNU compatibility")
46 //usage:#define sort_example_usage
47 //usage: "$ echo -e \"e\\nf\\nb\\nd\\nc\\na\" | sort\n"
54 //usage: IF_FEATURE_SORT_BIG(
55 //usage: "$ echo -e \"c 3\\nb 2\\nd 2\" | $SORT -k 2,2n -k 1,1r\n"
64 /* This is a NOEXEC applet. Be very careful! */
68 sort [-m][-o output][-bdfinru][-t char][-k keydef]... [file...]
69 sort -c [-bdfinru][-t char][-k keydef][file]
72 /* These are sort types */
73 static const char OPT_STR
[] ALIGN1
= "ngMucszbrdfimS:T:o:k:t:";
75 FLAG_n
= 1, /* Numeric sort */
76 FLAG_g
= 2, /* Sort using strtod() */
77 FLAG_M
= 4, /* Sort date */
78 /* ucsz apply to root level only, not keys. b at root level implies bb */
79 FLAG_u
= 8, /* Unique */
80 FLAG_c
= 0x10, /* Check: no output, exit(!ordered) */
81 FLAG_s
= 0x20, /* Stable sort, no ascii fallback at end */
82 FLAG_z
= 0x40, /* Input and output is NUL terminated, not \n */
83 /* These can be applied to search keys, the previous four can't */
84 FLAG_b
= 0x80, /* Ignore leading blanks */
85 FLAG_r
= 0x100, /* Reverse */
86 FLAG_d
= 0x200, /* Ignore !(isalnum()|isspace()) */
87 FLAG_f
= 0x400, /* Force uppercase */
88 FLAG_i
= 0x800, /* Ignore !isprint() */
89 FLAG_m
= 0x1000, /* ignored: merge already sorted files; do not sort */
90 FLAG_S
= 0x2000, /* ignored: -S, --buffer-size=SIZE */
91 FLAG_T
= 0x4000, /* ignored: -T, --temporary-directory=DIR */
95 FLAG_bb
= 0x80000000, /* Ignore trailing blanks */
98 #if ENABLE_FEATURE_SORT_BIG
99 static char key_separator
;
101 static struct sort_key
{
102 struct sort_key
*next_key
; /* linked list */
103 unsigned range
[4]; /* start word, start char, end word, end char */
107 static char *get_key(char *str
, struct sort_key
*key
, int flags
)
109 int start
= 0, end
= 0, len
, j
;
112 /* Special case whole string, so we don't have to make a copy */
113 if (key
->range
[0] == 1 && !key
->range
[1] && !key
->range
[2] && !key
->range
[3]
114 && !(flags
& (FLAG_b
| FLAG_d
| FLAG_f
| FLAG_i
| FLAG_bb
))
119 /* Find start of key on first pass, end on second pass */
121 for (j
= 0; j
< 2; j
++) {
122 if (!key
->range
[2*j
])
124 /* Loop through fields */
127 for (i
= 1; i
< key
->range
[2*j
] + j
; i
++) {
129 /* Skip body of key and separator */
131 if (str
[end
++] == key_separator
)
135 /* Skip leading blanks */
136 while (isspace(str
[end
]))
138 /* Skip body of key */
140 if (isspace(str
[end
]))
149 /* Strip leading whitespace if necessary */
150 //XXX: skip_whitespace()
152 while (isspace(str
[start
])) start
++;
153 /* Strip trailing whitespace if necessary */
155 while (end
> start
&& isspace(str
[end
-1])) end
--;
156 /* Handle offsets on start and end */
158 end
+= key
->range
[3] - 1;
159 if (end
> len
) end
= len
;
162 start
+= key
->range
[1] - 1;
163 if (start
> len
) start
= len
;
166 if (end
< start
) end
= start
;
167 str
= xstrndup(str
+start
, end
-start
);
169 if (flags
& FLAG_d
) {
170 for (start
= end
= 0; str
[end
]; end
++)
171 if (isspace(str
[end
]) || isalnum(str
[end
]))
172 str
[start
++] = str
[end
];
176 if (flags
& FLAG_i
) {
177 for (start
= end
= 0; str
[end
]; end
++)
178 if (isprint_asciionly(str
[end
]))
179 str
[start
++] = str
[end
];
184 for (i
= 0; str
[i
]; i
++)
185 str
[i
] = toupper(str
[i
]);
190 static struct sort_key
*add_key(void)
192 struct sort_key
**pkey
= &key_list
;
194 pkey
= &((*pkey
)->next_key
);
195 return *pkey
= xzalloc(sizeof(struct sort_key
));
198 #define GET_LINE(fp) \
199 ((option_mask32 & FLAG_z) \
200 ? bb_get_chunk_from_file(fp, NULL) \
201 : xmalloc_fgetline(fp))
203 #define GET_LINE(fp) xmalloc_fgetline(fp)
206 /* Iterate through keys list and perform comparisons */
207 static int compare_keys(const void *xarg
, const void *yarg
)
209 int flags
= option_mask32
, retval
= 0;
212 #if ENABLE_FEATURE_SORT_BIG
213 struct sort_key
*key
;
215 for (key
= key_list
; !retval
&& key
; key
= key
->next_key
) {
216 flags
= key
->flags
? key
->flags
: option_mask32
;
217 /* Chop out and modify key chunks, handling -dfib */
218 x
= get_key(*(char **)xarg
, key
, flags
);
219 y
= get_key(*(char **)yarg
, key
, flags
);
221 /* This curly bracket serves no purpose but to match the nesting
222 * level of the for () loop we're not using */
227 /* Perform actual comparison */
228 switch (flags
& (FLAG_n
| FLAG_M
| FLAG_g
)) {
230 bb_error_msg_and_die("unknown sort type");
234 #if ENABLE_LOCALE_SUPPORT
235 retval
= strcoll(x
, y
);
237 retval
= strcmp(x
, y
);
240 #if ENABLE_FEATURE_SORT_BIG
243 double dx
= strtod(x
, &xx
);
244 double dy
= strtod(y
, &yy
);
245 /* not numbers < NaN < -infinity < numbers < +infinity) */
247 retval
= (y
== yy
? 0 : -1);
250 /* Check for isnan */
252 retval
= (dy
!= dy
) ? 0 : -1;
255 /* Check for infinity. Could underflow, but it avoids libm. */
256 else if (1.0 / dx
== 0.0) {
258 retval
= (1.0 / dy
== 0.0 && dy
< 0) ? 0 : -1;
260 retval
= (1.0 / dy
== 0.0 && dy
> 0) ? 0 : 1;
261 } else if (1.0 / dy
== 0.0)
262 retval
= (dy
< 0) ? 1 : -1;
264 retval
= (dx
> dy
) ? 1 : ((dx
< dy
) ? -1 : 0);
272 xx
= strptime(x
, "%b", &thyme
);
274 yy
= strptime(y
, "%b", &thyme
);
276 retval
= (!yy
) ? 0 : -1;
280 retval
= (dx
== thyme
.tm_mon
) ? 0 : dx
- thyme
.tm_mon
;
283 /* Full floating point version of -n */
287 retval
= (dx
> dy
) ? 1 : ((dx
< dy
) ? -1 : 0);
291 /* Free key copies. */
292 if (x
!= *(char **)xarg
) free(x
);
293 if (y
!= *(char **)yarg
) free(y
);
294 /* if (retval) break; - done by for () anyway */
296 /* Integer version of -n for tiny systems */
298 retval
= atoi(x
) - atoi(y
);
304 /* Perform fallback sort if necessary */
305 if (!retval
&& !(option_mask32
& FLAG_s
)) {
306 retval
= strcmp(*(char **)xarg
, *(char **)yarg
);
307 flags
= option_mask32
;
316 #if ENABLE_FEATURE_SORT_BIG
317 static unsigned str2u(char **str
)
320 if (!isdigit((*str
)[0]))
321 bb_error_msg_and_die("bad field specification");
322 lu
= strtoul(*str
, str
, 10);
323 if ((sizeof(long) > sizeof(int) && lu
> INT_MAX
) || !lu
)
324 bb_error_msg_and_die("bad field specification");
329 int sort_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
330 int sort_main(int argc UNUSED_PARAM
, char **argv
)
333 char *str_ignored
, *str_o
, *str_t
;
334 llist_t
*lst_k
= NULL
;
339 xfunc_error_retval
= 2;
341 /* Parse command line options */
342 /* -o and -t can be given at most once */
343 opt_complementary
= "o--o:t--t:" /* -t, -o: at most one of each */
344 "k::"; /* -k takes list */
345 opts
= getopt32(argv
, OPT_STR
, &str_ignored
, &str_ignored
, &str_o
, &lst_k
, &str_t
);
346 /* global b strips leading and trailing spaces */
348 option_mask32
|= FLAG_bb
;
349 #if ENABLE_FEATURE_SORT_BIG
351 if (!str_t
[0] || str_t
[1])
352 bb_error_msg_and_die("bad -t parameter");
353 key_separator
= str_t
[0];
355 /* note: below this point we use option_mask32, not opts,
356 * since that reduces register pressure and makes code smaller */
362 FLAG_n
| /* Numeric sort */
363 FLAG_g
| /* Sort using strtod() */
364 FLAG_M
| /* Sort date */
365 FLAG_b
| /* Ignore leading blanks */
366 FLAG_r
| /* Reverse */
367 FLAG_d
| /* Ignore !(isalnum()|isspace()) */
368 FLAG_f
| /* Force uppercase */
369 FLAG_i
| /* Ignore !isprint() */
372 struct sort_key
*key
= add_key();
373 char *str_k
= llist_pop(&lst_k
);
375 i
= 0; /* i==0 before comma, 1 after (-k3,6) */
378 /* Cannot use bb_strtou - suffix can be a letter */
379 key
->range
[2*i
] = str2u(&str_k
);
382 key
->range
[2*i
+1] = str2u(&str_k
);
387 if (*str_k
== ',' && !i
++) {
390 } /* no else needed: fall through to syntax error
391 because comma isn't in OPT_STR */
392 temp2
= strchr(OPT_STR
, *str_k
);
394 bb_error_msg_and_die("unknown key option");
395 flag
= 1 << (temp2
- OPT_STR
);
396 if (flag
& ~FLAG_allowed_for_k
)
397 bb_error_msg_and_die("unknown sort type");
398 /* b after ',' means strip _trailing_ space */
399 if (i
&& flag
== FLAG_b
)
408 /* Open input files and read data */
411 *--argv
= (char*)"-";
415 /* coreutils 6.9 compat: abort on first open error,
416 * do not continue to next file: */
417 FILE *fp
= xfopen_stdin(*argv
);
422 lines
= xrealloc_vector(lines
, 6, linecount
);
423 lines
[linecount
++] = line
;
425 fclose_if_not_stdin(fp
);
428 #if ENABLE_FEATURE_SORT_BIG
429 /* if no key, perform alphabetic sort */
431 add_key()->range
[0] = 1;
433 if (option_mask32
& FLAG_c
) {
434 int j
= (option_mask32
& FLAG_u
) ? -1 : 0;
435 for (i
= 1; i
< linecount
; i
++) {
436 if (compare_keys(&lines
[i
-1], &lines
[i
]) > j
) {
437 fprintf(stderr
, "Check line %u\n", i
);
444 /* Perform the actual sort */
445 qsort(lines
, linecount
, sizeof(lines
[0]), compare_keys
);
447 if (option_mask32
& FLAG_u
) {
449 /* coreutils 6.3 drop lines for which only key is the same */
450 /* -- disabling last-resort compare... */
451 option_mask32
|= FLAG_s
;
452 for (i
= 1; i
< linecount
; i
++) {
453 if (compare_keys(&lines
[flag
], &lines
[i
]) == 0)
456 lines
[++flag
] = lines
[i
];
463 #if ENABLE_FEATURE_SORT_BIG
464 /* Open output file _after_ we read all input ones */
465 if (option_mask32
& FLAG_o
)
466 xmove_fd(xopen(str_o
, O_WRONLY
|O_CREAT
|O_TRUNC
), STDOUT_FILENO
);
468 flag
= (option_mask32
& FLAG_z
) ? '\0' : '\n';
469 for (i
= 0; i
< linecount
; i
++)
470 printf("%s%c", lines
[i
], flag
);
472 fflush_stdout_and_exit(EXIT_SUCCESS
);