source: MondoRescue/branches/stable/mindi-busybox/coreutils/sort.c@ 821

Last change on this file since 821 was 821, checked in by Bruno Cornec, 18 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 8.9 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * SuS3 compliant sort implementation for busybox
4 *
5 * Copyright (C) 2004 by Rob Landley <rob@landley.net>
6 *
7 * MAINTAINER: Rob Landley <rob@landley.net>
8 *
9 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10 *
11 * See SuS3 sort standard at:
12 * http://www.opengroup.org/onlinepubs/007904975/utilities/sort.html
13 */
14
15#include <ctype.h>
16#include <math.h>
17#include <stdio.h>
18#include <stdlib.h>
19#include <string.h>
20#include <time.h>
21#include <unistd.h>
22#include "busybox.h"
23
24static int global_flags;
25
26/*
27 sort [-m][-o output][-bdfinru][-t char][-k keydef]... [file...]
28 sort -c [-bdfinru][-t char][-k keydef][file]
29*/
30
31/* These are sort types */
32#define FLAG_n 1 /* Numeric sort */
33#define FLAG_g 2 /* Sort using strtod() */
34#define FLAG_M 4 /* Sort date */
35/* ucsz apply to root level only, not keys. b at root level implies bb */
36#define FLAG_u 8 /* Unique */
37#define FLAG_c 16 /* Check: no output, exit(!ordered) */
38#define FLAG_s 32 /* Stable sort, no ascii fallback at end */
39#define FLAG_z 64 /* Input is null terminated, not \n */
40/* These can be applied to search keys, the previous four can't */
41#define FLAG_b 128 /* Ignore leading blanks */
42#define FLAG_r 256 /* Reverse */
43#define FLAG_d 512 /* Ignore !(isalnum()|isspace()) */
44#define FLAG_f 1024 /* Force uppercase */
45#define FLAG_i 2048 /* Ignore !isprint() */
46#define FLAG_bb 32768 /* Ignore trailing blanks */
47
48
49#ifdef CONFIG_FEATURE_SORT_BIG
50static char key_separator;
51
52static struct sort_key
53{
54 struct sort_key *next_key; /* linked list */
55 unsigned short range[4]; /* start word, start char, end word, end char */
56 int flags;
57} *key_list;
58
59static char *get_key(char *str, struct sort_key *key, int flags)
60{
61 int start=0,end,len,i,j;
62
63 /* Special case whole string, so we don't have to make a copy */
64 if(key->range[0]==1 && !key->range[1] && !key->range[2] && !key->range[3]
65 && !(flags&(FLAG_b&FLAG_d&FLAG_f&FLAG_i&FLAG_bb))) return str;
66 /* Find start of key on first pass, end on second pass*/
67 len=strlen(str);
68
69 for(j=0;j<2;j++) {
70 if(!key->range[2*j]) end=len;
71 /* Loop through fields */
72 else {
73 end=0;
74 for(i=1;i<key->range[2*j]+j;i++) {
75 /* Skip leading blanks or first separator */
76 if(str[end]) {
77 if(!key_separator && isspace(str[end]))
78 while(isspace(str[end])) end++;
79 }
80 /* Skip body of key */
81 for(;str[end];end++) {
82 if(key_separator) {
83 if(str[end]==key_separator) break;
84 } else if(isspace(str[end])) break;
85 }
86 }
87 }
88 if(!j) start=end;
89 }
90 /* Key with explicit separator starts after separator */
91 if(key_separator && str[start]==key_separator) start++;
92 /* Strip leading whitespace if necessary */
93 if(flags&FLAG_b) while(isspace(str[start])) start++;
94 /* Strip trailing whitespace if necessary */
95 if(flags&FLAG_bb) while(end>start && isspace(str[end-1])) end--;
96 /* Handle offsets on start and end */
97 if(key->range[3]) {
98 end+=key->range[3]-1;
99 if(end>len) end=len;
100 }
101 if(key->range[1]) {
102 start+=key->range[1]-1;
103 if(start>len) start=len;
104 }
105 /* Make the copy */
106 if(end<start) end=start;
107 str=bb_xstrndup(str+start,end-start);
108 /* Handle -d */
109 if(flags&FLAG_d) {
110 for(start=end=0;str[end];end++)
111 if(isspace(str[end]) || isalnum(str[end])) str[start++]=str[end];
112 str[start]=0;
113 }
114 /* Handle -i */
115 if(flags&FLAG_i) {
116 for(start=end=0;str[end];end++)
117 if(isprint(str[end])) str[start++]=str[end];
118 str[start]=0;
119 }
120 /* Handle -f */
121 if(flags*FLAG_f) for(i=0;str[i];i++) str[i]=toupper(str[i]);
122
123 return str;
124}
125
126static struct sort_key *add_key(void)
127{
128 struct sort_key **pkey=&key_list;
129 while(*pkey) pkey=&((*pkey)->next_key);
130 return *pkey=xcalloc(1,sizeof(struct sort_key));
131}
132
133#define GET_LINE(fp) (global_flags&FLAG_z) ? bb_get_chunk_from_file(fp,NULL) \
134 : bb_get_chomped_line_from_file(fp)
135#else
136#define GET_LINE(fp) bb_get_chomped_line_from_file(fp)
137#endif
138
139/* Iterate through keys list and perform comparisons */
140static int compare_keys(const void *xarg, const void *yarg)
141{
142 int flags=global_flags,retval=0;
143 char *x,*y;
144
145#ifdef CONFIG_FEATURE_SORT_BIG
146 struct sort_key *key;
147
148 for(key=key_list;!retval && key;key=key->next_key) {
149 flags=(key->flags) ? key->flags : global_flags;
150 /* Chop out and modify key chunks, handling -dfib */
151 x=get_key(*(char **)xarg,key,flags);
152 y=get_key(*(char **)yarg,key,flags);
153#else
154 /* This curly bracket serves no purpose but to match the nesting
155 level of the for() loop we're not using */
156 {
157 x=*(char **)xarg;
158 y=*(char **)yarg;
159#endif
160 /* Perform actual comparison */
161 switch(flags&7) {
162 default:
163 bb_error_msg_and_die("Unknown sort type.");
164 break;
165 /* Ascii sort */
166 case 0:
167 retval=strcmp(x,y);
168 break;
169#ifdef CONFIG_FEATURE_SORT_BIG
170 case FLAG_g:
171 {
172 char *xx,*yy;
173 double dx=strtod(x,&xx), dy=strtod(y,&yy);
174 /* not numbers < NaN < -infinity < numbers < +infinity) */
175 if(x==xx) retval=(y==yy ? 0 : -1);
176 else if(y==yy) retval=1;
177 /* Check for isnan */
178 else if(dx != dx) retval = (dy != dy) ? 0 : -1;
179 else if(dy != dy) retval = 1;
180 /* Check for infinity. Could underflow, but it avoids libm. */
181 else if(1.0/dx == 0.0) {
182 if(dx<0) retval=((1.0/dy == 0.0 && dy<0) ? 0 : -1);
183 else retval=((1.0/dy == 0.0 && dy>0) ? 0 : 1);
184 } else if(1.0/dy == 0.0) retval=dy<0 ? 1 : -1;
185 else retval=dx>dy ? 1 : (dx<dy ? -1 : 0);
186 break;
187 }
188 case FLAG_M:
189 {
190 struct tm thyme;
191 int dx;
192 char *xx,*yy;
193
194 xx=strptime(x,"%b",&thyme);
195 dx=thyme.tm_mon;
196 yy=strptime(y,"%b",&thyme);
197 if(!xx) retval=(!yy ? 0 : -1);
198 else if(!yy) retval=1;
199 else retval=(dx==thyme.tm_mon ? 0 : dx-thyme.tm_mon);
200 break;
201 }
202 /* Full floating point version of -n */
203 case FLAG_n:
204 {
205 double dx=atof(x),dy=atof(y);
206 retval=dx>dy ? 1 : (dx<dy ? -1 : 0);
207 break;
208 }
209 }
210 /* Free key copies. */
211 if(x!=*(char **)xarg) free(x);
212 if(y!=*(char **)yarg) free(y);
213 if(retval) break;
214#else
215 /* Integer version of -n for tiny systems */
216 case FLAG_n:
217 retval=atoi(x)-atoi(y);
218 break;
219 }
220#endif
221 }
222 /* Perform fallback sort if necessary */
223 if(!retval && !(global_flags&FLAG_s))
224 retval=strcmp(*(char **)xarg, *(char **)yarg);
225//dprintf(2,"reverse=%d\n",flags&FLAG_r);
226 return ((flags&FLAG_r)?-1:1)*retval;
227}
228
229int sort_main(int argc, char **argv)
230{
231 FILE *fp,*outfile=NULL;
232 int linecount=0,i,flag;
233 char *line,**lines=NULL,*optlist="ngMucszbrdfimS:T:o:k:t:";
234 int c;
235
236 bb_default_error_retval = 2;
237 /* Parse command line options */
238 while((c=getopt(argc,argv,optlist))>0) {
239 line=strchr(optlist,c);
240 if(!line) bb_show_usage();
241 switch(*line) {
242#ifdef CONFIG_FEATURE_SORT_BIG
243 case 'o':
244 if(outfile) bb_error_msg_and_die("Too many -o.");
245 outfile=bb_xfopen(optarg,"w");
246 break;
247 case 't':
248 if(key_separator || optarg[1])
249 bb_error_msg_and_die("Too many -t.");
250 key_separator=*optarg;
251 break;
252 /* parse sort key */
253 case 'k':
254 {
255 struct sort_key *key=add_key();
256 char *temp, *temp2;
257
258 temp=optarg;
259 for(i=0;*temp;) {
260 /* Start of range */
261 key->range[2*i]=(unsigned short)strtol(temp,&temp,10);
262 if(*temp=='.')
263 key->range[(2*i)+1]=(unsigned short)strtol(temp+1,&temp,10);
264 for(;*temp;temp++) {
265 if(*temp==',' && !i++) {
266 temp++;
267 break;
268 } /* no else needed: fall through to syntax error
269 because comma isn't in optlist */
270 temp2=strchr(optlist,*temp);
271 flag=(1<<(temp2-optlist));
272 if(!temp2 || (flag>FLAG_M && flag<FLAG_b))
273 bb_error_msg_and_die("Unknown key option.");
274 /* b after , means strip _trailing_ space */
275 if(i && flag==FLAG_b) flag=FLAG_bb;
276 key->flags|=flag;
277 }
278 }
279 break;
280 }
281#endif
282 default:
283 global_flags|=(1<<(line-optlist));
284 /* global b strips leading and trailing spaces */
285 if(global_flags&FLAG_b) global_flags|=FLAG_bb;
286 break;
287 }
288 }
289 /* Open input files and read data */
290 for(i=argv[optind] ? optind : optind-1;argv[i];i++) {
291 if(i<optind || (*argv[i]=='-' && !argv[i][1])) fp=stdin;
292 else fp=bb_xfopen(argv[i],"r");
293 for(;;) {
294 line=GET_LINE(fp);
295 if(!line) break;
296 if(!(linecount&63))
297 lines=xrealloc(lines, sizeof(char *)*(linecount+64));
298 lines[linecount++]=line;
299 }
300 fclose(fp);
301 }
302#ifdef CONFIG_FEATURE_SORT_BIG
303 /* if no key, perform alphabetic sort */
304 if(!key_list) add_key()->range[0]=1;
305 /* handle -c */
306 if(global_flags&FLAG_c) {
307 int j=(global_flags&FLAG_u) ? -1 : 0;
308 for(i=1;i<linecount;i++)
309 if(compare_keys(&lines[i-1],&lines[i])>j) {
310 fprintf(stderr,"Check line %d\n",i);
311 return 1;
312 }
313 return 0;
314 }
315#endif
316 /* Perform the actual sort */
317 qsort(lines,linecount,sizeof(char *),compare_keys);
318 /* handle -u */
319 if(global_flags&FLAG_u) {
320 for(flag=0,i=1;i<linecount;i++) {
321 if(!compare_keys(&lines[flag],&lines[i])) free(lines[i]);
322 else lines[++flag]=lines[i];
323 }
324 if(linecount) linecount=flag+1;
325 }
326 /* Print it */
327 if(!outfile) outfile=stdout;
328 for(i=0;i<linecount;i++) fprintf(outfile,"%s\n",lines[i]);
329 bb_fflush_stdout_and_exit(EXIT_SUCCESS);
330}
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