+/* vi: set sw=4 ts=4: */
/*
- * Mini sort implementation for busybox
+ * SuS3 compliant sort implementation for busybox
*
+ * Copyright (C) 2004 by Rob Landley <rob@landley.net>
*
- * Copyright (C) 1999 by Lineo, inc.
- * Written by John Beppu <beppu@lineo.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * 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 "internal.h"
-#include <sys/types.h>
-#include <fcntl.h>
-#include <dirent.h>
+#include <ctype.h>
+#include <math.h>
#include <stdio.h>
-#include <errno.h>
-
-static const char sort_usage[] =
-"sort [OPTION]... [FILE]...\n\n"
-;
-
-/* typedefs _______________________________________________________________ */
-
-/* line node */
-typedef struct Line {
- char *data; /* line data */
- struct Line *next; /* pointer to next line node */
-} Line;
-
-/* singly-linked list of lines */
-typedef struct {
- int len; /* number of Lines */
- Line **sorted; /* array fed to qsort */
-
- Line *head; /* head of List */
- Line *current; /* current Line */
-} List;
-
-/* comparison function */
-typedef int (Compare)(const void *, const void *);
-
-
-/* methods ________________________________________________________________ */
-
-static const int max = 1024;
-
-/* mallocate Line */
-static Line *
-line_alloc()
-{
- Line *self;
- self = malloc(1 * sizeof(Line));
- return self;
-}
-
-/* Initialize Line with string */
-static Line *
-line_init(Line *self, const char *string)
-{
- self->data = malloc((strlen(string) + 1) * sizeof(char));
- if (self->data == NULL) { return NULL; }
- strcpy(self->data, string);
- self->next = NULL;
- return self;
-}
-
-/* Construct Line from FILE* */
-static Line *
-line_newFromFile(FILE *src)
-{
- char buffer[max];
- Line *self;
-
- if (fgets(buffer, max, src)) {
- self = line_alloc();
- if (self == NULL) { return NULL; }
- line_init(self, buffer);
- return self;
- }
- return NULL;
-}
-
-/* Line destructor */
-static Line *
-line_release(Line *self)
-{
- if (self->data) {
- free(self->data);
- free(self);
- }
- return self;
-}
-
-
-/* Comparison */
-
-/* ascii order */
-static int
-compare_ascii(const void *a, const void *b)
-{
- Line **doh;
- Line *x, *y;
-
- doh = (Line **) a;
- x = *doh;
- doh = (Line **) b;
- y = *doh;
-
- // fprintf(stdout, "> %p: %s< %p: %s", x, x->data, y, y->data);
- return strcmp(x->data, y->data);
-}
-
-/* numeric order */
-static int
-compare_numeric(const void *a, const void *b)
-{
- Line **doh;
- Line *x, *y;
- int xint, yint;
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+#include "busybox.h"
- doh = (Line **) a;
- x = *doh;
- doh = (Line **) b;
- y = *doh;
+static int global_flags;
- xint = strtoul(x->data, NULL, 10);
- yint = strtoul(y->data, NULL, 10);
-
- return (xint - yint);
-}
-
-
-/* List */
-
-/* */
-static List *
-list_init(List *self)
+/*
+ sort [-m][-o output][-bdfinru][-t char][-k keydef]... [file...]
+ sort -c [-bdfinru][-t char][-k keydef][file]
+*/
+
+/* These are sort types */
+#define FLAG_n 1 /* Numeric sort */
+#define FLAG_g 2 /* Sort using strtod() */
+#define FLAG_M 4 /* Sort date */
+/* ucsz apply to root level only, not keys. b at root level implies bb */
+#define FLAG_u 8 /* Unique */
+#define FLAG_c 16 /* Check: no output, exit(!ordered) */
+#define FLAG_s 32 /* Stable sort, no ascii fallback at end */
+#define FLAG_z 64 /* Input is null terminated, not \n */
+/* These can be applied to search keys, the previous four can't */
+#define FLAG_b 128 /* Ignore leading blanks */
+#define FLAG_r 256 /* Reverse */
+#define FLAG_d 512 /* Ignore !(isalnum()|isspace()) */
+#define FLAG_f 1024 /* Force uppercase */
+#define FLAG_i 2048 /* Ignore !isprint() */
+#define FLAG_bb 32768 /* Ignore trailing blanks */
+
+
+#ifdef CONFIG_FEATURE_SORT_BIG
+static char key_separator;
+
+static struct sort_key
{
- self->len = 0;
- self->sorted = NULL;
- self->head = NULL;
- self->current = NULL;
- return self;
-}
+ struct sort_key *next_key; /* linked list */
+ unsigned short range[4]; /* start word, start char, end word, end char */
+ int flags;
+} *key_list;
-/* for simplicity, the List gains ownership of the line */
-static List *
-list_insert(List *self, Line *line)
+static char *get_key(char *str, struct sort_key *key, int flags)
{
- if (line == NULL) { return NULL; }
-
- /* first insertion */
- if (self->head == NULL) {
- self->head = line;
- self->current = line;
+ int start=0,end,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++) {
+ /* Skip leading blanks or first separator */
+ if(str[end]) {
+ if(key_separator) {
+ if(str[end]==key_separator) end++;
+ } else if(isspace(str[end]))
+ while(isspace(str[end])) end++;
+ }
+ /* Skip body of key */
+ for(;str[end];end++) {
+ if(key_separator) {
+ if(str[end]==key_separator) break;
+ } else if(isspace(str[end])) break;
+ }
+ }
+ }
+ if(!j) start=end;
+ }
+ /* Key with explicit separator starts after separator */
+ if(key_separator && str[start]==key_separator) start++;
+ /* Strip leading whitespace if necessary */
+ 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=bb_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]);
- /* all subsequent insertions */
- } else {
- self->current->next = line;
- self->current = line;
- }
- self->len++;
- return self;
+ return str;
}
-/* order the list according to compare() */
-static List *
-list_sort(List *self, Compare *compare)
+static struct sort_key *add_key(void)
{
- int i;
- Line *line;
-
- /* mallocate array of Line*s */
- self->sorted = (Line **) malloc(self->len * sizeof(Line*));
- if (self->sorted == NULL) { return NULL; }
-
- /* fill array w/ List's contents */
- i = 0;
- line = self->head;
- while (line) {
- self->sorted[i++] = line;
- line = line->next;
- }
-
- /* apply qsort */
- qsort(self->sorted, self->len, sizeof(Line*), compare);
- return self;
+ struct sort_key **pkey=&key_list;
+ while(*pkey) pkey=&((*pkey)->next_key);
+ return *pkey=xcalloc(1,sizeof(struct sort_key));
}
-/* precondition: list must be sorted */
-static List *
-list_writeToFile(List *self, FILE* dst)
-{
- int i;
- Line **line = self->sorted;
-
- if (self->sorted == NULL) { return NULL; }
- for (i = 0; i < self->len; i++) {
- fprintf(dst, "%s", line[i]->data);
- }
- return self;
-}
+#define GET_LINE(fp) (global_flags&FLAG_z) ? bb_get_chunk_from_file(fp,NULL) \
+ : bb_get_chomped_line_from_file(fp)
+#else
+#define GET_LINE(fp) bb_get_chomped_line_from_file(fp)
+#endif
-/* deallocate */
-static void
-list_release(List *self)
+/* Iterate through keys list and perform comparisons */
+static int compare_keys(const void *xarg, const void *yarg)
{
- Line *i;
- Line *die;
-
- i = self->head;
- while (i) {
- die = i;
- i = die->next;
- line_release(die);
- }
+ int flags=global_flags,retval=0;
+ char *x,*y;
+
+#ifdef CONFIG_FEATURE_SORT_BIG
+ struct sort_key *key;
+
+ for(key=key_list;!retval && key;key=key->next_key) {
+ flags=(key->flags) ? key->flags : global_flags;
+ /* 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:
+ retval=strcmp(x,y);
+ break;
+#ifdef CONFIG_FEATURE_SORT_BIG
+ case FLAG_g:
+ {
+ char *xx,*yy;
+ double dx=strtod(x,&xx), 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),dy=atof(y);
+ retval=dx>dy ? 1 : (dx<dy ? -1 : 0);
+ break;
+ }
+ }
+ /* Free key copies. */
+ if(x!=*(char **)xarg) free(x);
+ if(y!=*(char **)yarg) free(y);
+ if(retval) break;
+#else
+ /* Integer version of -n for tiny systems */
+ case FLAG_n:
+ retval=atoi(x)-atoi(y);
+ break;
+ }
+#endif
+ }
+ /* Perform fallback sort if necessary */
+ if(!retval && !(global_flags&FLAG_s))
+ retval=strcmp(*(char **)xarg, *(char **)yarg);
+//dprintf(2,"reverse=%d\n",flags&FLAG_r);
+ return ((flags&FLAG_r)?-1:1)*retval;
}
-
-/*
- * I need a list
- * to insert lines into
- * then I need to sort this list
- * and finally print it
- */
-
-int
-sort_main(int argc, char **argv)
+int sort_main(int argc, char **argv)
{
- int i;
- char opt;
- List list;
- Line *l;
- Compare *compare;
-
- /* init */
- compare = compare_ascii;
- list_init(&list);
-
- /* parse argv[] */
- for (i = 1; i < argc; i++) {
- if (argv[i][0] == '-') {
- opt = argv[i][1];
- switch (opt) {
- case 'g':
- /* what's the diff between -g && -n? */
- compare = compare_numeric;
- break;
- case 'h':
- usage(sort_usage);
- break;
- case 'n':
- /* what's the diff between -g && -n? */
- compare = compare_numeric;
- break;
- case 'r':
- /* reverse */
- break;
- default:
- fprintf(stderr, "sort: invalid option -- %c\n", opt);
- usage(sort_usage);
- }
- } else {
- break;
+ FILE *fp,*outfile=NULL;
+ int linecount=0,i,flag;
+ char *line,**lines=NULL,*optlist="ngMucszbrdfimS:T:o:k:t:";
+ int c;
+
+ bb_default_error_retval = 2;
+ /* Parse command line options */
+ while((c=getopt(argc,argv,optlist))>0) {
+ line=strchr(optlist,c);
+ if(!line) bb_show_usage();
+ switch(*line) {
+#ifdef CONFIG_FEATURE_SORT_BIG
+ case 'o':
+ if(outfile) bb_error_msg_and_die("Too many -o.");
+ outfile=bb_xfopen(optarg,"w");
+ break;
+ case 't':
+ if(key_separator || optarg[1])
+ bb_error_msg_and_die("Too many -t.");
+ key_separator=*optarg;
+ break;
+ /* parse sort key */
+ case 'k':
+ {
+ struct sort_key *key=add_key();
+ char *temp, *temp2;
+
+ temp=optarg;
+ for(i=0;*temp;) {
+ /* Start of range */
+ key->range[2*i]=(unsigned short)strtol(temp,&temp,10);
+ if(*temp=='.')
+ key->range[(2*i)+1]=(unsigned short)strtol(temp+1,&temp,10);
+ for(;*temp;temp++) {
+ if(*temp==',' && !i++) {
+ temp++;
+ break;
+ } /* no else needed: fall through to syntax error
+ because comma isn't in optlist */
+ temp2=strchr(optlist,*temp);
+ flag=(1<<(temp2-optlist));
+ if(!temp2 || (flag>FLAG_M && flag<FLAG_b))
+ bb_error_msg_and_die("Unknown key option.");
+ /* b after , means strip _trailing_ space */
+ if(i && flag==FLAG_b) flag=FLAG_bb;
+ key->flags|=flag;
+ }
+ }
+ break;
+ }
+#endif
+ default:
+ global_flags|=(1<<(line-optlist));
+ /* global b strips leading and trailing spaces */
+ if(global_flags&FLAG_b) global_flags|=FLAG_bb;
+ break;
+ }
}
- }
-
- /* this could be factored better */
-
- /* work w/ stdin */
- if (i >= argc) {
- while ( (l = line_newFromFile(stdin))) {
- list_insert(&list, l);
+ /* Open input files and read data */
+ for(i=argv[optind] ? optind : optind-1;argv[i];i++) {
+ if(i<optind || (*argv[i]=='-' && !argv[i][1])) fp=stdin;
+ else fp=bb_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);
}
- list_sort(&list, compare);
- list_writeToFile(&list, stdout);
- list_release(&list);
-
- /* work w/ what's left in argv[] */
- } else {
- FILE *src;
-
- for ( ; i < argc; i++) {
- src = fopen(argv[i], "r");
- if (src == NULL) { break; }
- while ( (l = line_newFromFile(src))) {
- list_insert(&list, l);
- }
- fclose(src);
+#ifdef CONFIG_FEATURE_SORT_BIG
+ /* if no key, perform alphabetic sort */
+ if(!key_list) add_key()->range[0]=1;
+ /* handle -c */
+ if(global_flags&FLAG_c) {
+ int j=(global_flags&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;
}
- list_sort(&list, compare);
- list_writeToFile(&list, stdout);
- list_release(&list);
- }
-
- exit(0);
+#endif
+ /* Perform the actual sort */
+ qsort(lines,linecount,sizeof(char *),compare_keys);
+ /* handle -u */
+ if(global_flags&FLAG_u) {
+ for(flag=0,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 */
+ if(!outfile) outfile=stdout;
+ for(i=0;i<linecount;i++) fprintf(outfile,"%s\n",lines[i]);
+ bb_fflush_stdout_and_exit(EXIT_SUCCESS);
}
-
-/* $Id: sort.c,v 1.9 2000/01/23 18:19:02 erik Exp $ */
projects / oweals / busybox.git / blobdiff