331 lines
8.8 KiB
C
331 lines
8.8 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* SuS3 compliant sort implementation for busybox
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*
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* Copyright (C) 2004 by Rob Landley <rob@landley.net>
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*
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* MAINTAINER: Rob Landley <rob@landley.net>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*
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* See SuS3 sort standard at:
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* http://www.opengroup.org/onlinepubs/007904975/utilities/sort.html
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*/
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#include <ctype.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include "busybox.h"
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static int global_flags;
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/*
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sort [-m][-o output][-bdfinru][-t char][-k keydef]... [file...]
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sort -c [-bdfinru][-t char][-k keydef][file]
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*/
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/* These are sort types */
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#define FLAG_n 1 /* Numeric sort */
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#define FLAG_g 2 /* Sort using strtod() */
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#define FLAG_M 4 /* Sort date */
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/* ucsz apply to root level only, not keys. b at root level implies bb */
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#define FLAG_u 8 /* Unique */
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#define FLAG_c 16 /* Check: no output, exit(!ordered) */
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#define FLAG_s 32 /* Stable sort, no ascii fallback at end */
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#define FLAG_z 64 /* Input is null terminated, not \n */
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/* These can be applied to search keys, the previous four can't */
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#define FLAG_b 128 /* Ignore leading blanks */
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#define FLAG_r 256 /* Reverse */
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#define FLAG_d 512 /* Ignore !(isalnum()|isspace()) */
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#define FLAG_f 1024 /* Force uppercase */
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#define FLAG_i 2048 /* Ignore !isprint() */
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#define FLAG_bb 32768 /* Ignore trailing blanks */
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#ifdef CONFIG_FEATURE_SORT_BIG
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static char key_separator;
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static struct sort_key
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{
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struct sort_key *next_key; /* linked list */
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unsigned short range[4]; /* start word, start char, end word, end char */
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int flags;
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} *key_list;
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static char *get_key(char *str, struct sort_key *key, int flags)
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{
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int start=0,end,len,i,j;
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/* Special case whole string, so we don't have to make a copy */
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if(key->range[0]==1 && !key->range[1] && !key->range[2] && !key->range[3]
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&& !(flags&(FLAG_b&FLAG_d&FLAG_f&FLAG_i&FLAG_bb))) return str;
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/* Find start of key on first pass, end on second pass*/
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len=strlen(str);
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for(j=0;j<2;j++) {
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if(!key->range[2*j]) end=len;
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/* Loop through fields */
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else {
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end=0;
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for(i=1;i<key->range[2*j]+j;i++) {
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/* Skip leading blanks or first separator */
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if(str[end]) {
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if(key_separator) {
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if(str[end]==key_separator) end++;
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} else if(isspace(str[end]))
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while(isspace(str[end])) end++;
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}
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/* Skip body of key */
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for(;str[end];end++) {
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if(key_separator) {
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if(str[end]==key_separator) break;
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} else if(isspace(str[end])) break;
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}
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}
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}
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if(!j) start=end;
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}
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/* Key with explicit separator starts after separator */
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if(key_separator && str[start]==key_separator) start++;
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/* Strip leading whitespace if necessary */
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if(flags&FLAG_b) while(isspace(str[start])) start++;
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/* Strip trailing whitespace if necessary */
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if(flags&FLAG_bb) while(end>start && isspace(str[end-1])) end--;
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/* Handle offsets on start and end */
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if(key->range[3]) {
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end+=key->range[3]-1;
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if(end>len) end=len;
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}
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if(key->range[1]) {
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start+=key->range[1]-1;
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if(start>len) start=len;
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}
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/* Make the copy */
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if(end<start) end=start;
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str=bb_xstrndup(str+start,end-start);
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/* Handle -d */
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if(flags&FLAG_d) {
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for(start=end=0;str[end];end++)
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if(isspace(str[end]) || isalnum(str[end])) str[start++]=str[end];
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str[start]=0;
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}
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/* Handle -i */
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if(flags&FLAG_i) {
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for(start=end=0;str[end];end++)
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if(isprint(str[end])) str[start++]=str[end];
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str[start]=0;
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}
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/* Handle -f */
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if(flags*FLAG_f) for(i=0;str[i];i++) str[i]=toupper(str[i]);
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return str;
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}
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static struct sort_key *add_key(void)
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{
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struct sort_key **pkey=&key_list;
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while(*pkey) pkey=&((*pkey)->next_key);
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return *pkey=xcalloc(1,sizeof(struct sort_key));
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}
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#define GET_LINE(fp) (global_flags&FLAG_z) ? bb_get_chunk_from_file(fp,NULL) \
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: bb_get_chomped_line_from_file(fp)
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#else
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#define GET_LINE(fp) bb_get_chomped_line_from_file(fp)
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#endif
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/* Iterate through keys list and perform comparisons */
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static int compare_keys(const void *xarg, const void *yarg)
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{
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int flags=global_flags,retval=0;
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char *x,*y;
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#ifdef CONFIG_FEATURE_SORT_BIG
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struct sort_key *key;
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for(key=key_list;!retval && key;key=key->next_key) {
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flags=(key->flags) ? key->flags : global_flags;
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/* Chop out and modify key chunks, handling -dfib */
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x=get_key(*(char **)xarg,key,flags);
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y=get_key(*(char **)yarg,key,flags);
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#else
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/* This curly bracket serves no purpose but to match the nesting
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level of the for() loop we're not using */
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{
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x=*(char **)xarg;
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y=*(char **)yarg;
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#endif
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/* Perform actual comparison */
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switch(flags&7) {
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default:
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bb_error_msg_and_die("Unknown sort type.");
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break;
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/* Ascii sort */
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case 0:
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retval=strcmp(x,y);
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break;
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#ifdef CONFIG_FEATURE_SORT_BIG
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case FLAG_g:
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{
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char *xx,*yy;
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double dx=strtod(x,&xx), dy=strtod(y,&yy);
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/* not numbers < NaN < -infinity < numbers < +infinity) */
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if(x==xx) retval=(y==yy ? 0 : -1);
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else if(y==yy) retval=1;
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else if(isnan(dx)) retval=isnan(dy) ? 0 : -1;
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else if(isnan(dy)) retval=1;
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else if(isinf(dx)) {
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if(dx<0) retval=((isinf(dy) && dy<0) ? 0 : -1);
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else retval=((isinf(dy) && dy>0) ? 0 : 1);
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} else if(isinf(dy)) retval=dy<0 ? 1 : -1;
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else retval=dx>dy ? 1 : (dx<dy ? -1 : 0);
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break;
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}
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case FLAG_M:
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{
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struct tm thyme;
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int dx;
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char *xx,*yy;
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xx=strptime(x,"%b",&thyme);
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dx=thyme.tm_mon;
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yy=strptime(y,"%b",&thyme);
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if(!xx) retval=(!yy ? 0 : -1);
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else if(!yy) retval=1;
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else retval=(dx==thyme.tm_mon ? 0 : dx-thyme.tm_mon);
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break;
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}
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/* Full floating point version of -n */
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case FLAG_n:
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{
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double dx=atof(x),dy=atof(y);
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retval=dx>dy ? 1 : (dx<dy ? -1 : 0);
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break;
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}
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}
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/* Free key copies. */
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if(x!=*(char **)xarg) free(x);
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if(y!=*(char **)yarg) free(y);
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if(retval) break;
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#else
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/* Integer version of -n for tiny systems */
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case FLAG_n:
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retval=atoi(x)-atoi(y);
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break;
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}
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#endif
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}
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/* Perform fallback sort if necessary */
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if(!retval && !(global_flags&FLAG_s))
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retval=strcmp(*(char **)xarg, *(char **)yarg);
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//dprintf(2,"reverse=%d\n",flags&FLAG_r);
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return ((flags&FLAG_r)?-1:1)*retval;
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}
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int sort_main(int argc, char **argv)
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{
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FILE *fp,*outfile=NULL;
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int linecount=0,i,flag;
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char *line,**lines=NULL,*optlist="ngMucszbrdfimS:T:o:k:t:";
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int c;
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bb_default_error_retval = 2;
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/* Parse command line options */
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while((c=getopt(argc,argv,optlist))>0) {
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line=index(optlist,c);
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if(!line) bb_show_usage();
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switch(*line) {
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#ifdef CONFIG_FEATURE_SORT_BIG
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case 'o':
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if(outfile) bb_error_msg_and_die("Too many -o.");
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outfile=bb_xfopen(optarg,"w");
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break;
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case 't':
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if(key_separator || optarg[1])
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bb_error_msg_and_die("Too many -t.");
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key_separator=*optarg;
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break;
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/* parse sort key */
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case 'k':
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{
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struct sort_key *key=add_key();
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char *temp, *temp2;
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temp=optarg;
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for(i=0;*temp;) {
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/* Start of range */
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key->range[2*i]=(unsigned short)strtol(temp,&temp,10);
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if(*temp=='.')
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key->range[(2*i)+1]=(unsigned short)strtol(temp+1,&temp,10);
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for(;*temp;temp++) {
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if(*temp==',' && !i++) {
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temp++;
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break;
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} /* no else needed: fall through to syntax error
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because comma isn't in optlist */
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temp2=index(optlist,*temp);
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flag=(1<<(temp2-optlist));
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if(!temp2 || (flag>FLAG_M && flag<FLAG_b))
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bb_error_msg_and_die("Unknown key option.");
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/* b after , means strip _trailing_ space */
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if(i && flag==FLAG_b) flag=FLAG_bb;
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key->flags|=flag;
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}
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}
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break;
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}
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#endif
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default:
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global_flags|=(1<<(line-optlist));
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/* global b strips leading and trailing spaces */
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if(global_flags&FLAG_b) global_flags|=FLAG_bb;
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break;
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}
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}
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/* Open input files and read data */
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for(i=argv[optind] ? optind : optind-1;argv[i];i++) {
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if(i<optind || (*argv[i]=='-' && !argv[i][1])) fp=stdin;
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else fp=bb_xfopen(argv[i],"r");
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for(;;) {
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line=GET_LINE(fp);
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if(!line) break;
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if(!(linecount&63))
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lines=xrealloc(lines, sizeof(char *)*(linecount+64));
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lines[linecount++]=line;
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}
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fclose(fp);
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}
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#ifdef CONFIG_FEATURE_SORT_BIG
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/* if no key, perform alphabetic sort */
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if(!key_list) add_key()->range[0]=1;
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/* handle -c */
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if(global_flags&FLAG_c) {
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int j=(global_flags&FLAG_u) ? -1 : 0;
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for(i=1;i<linecount;i++)
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if(compare_keys(&lines[i-1],&lines[i])>j) {
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fprintf(stderr,"Check line %d\n",i);
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return 1;
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}
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return 0;
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}
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#endif
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/* Perform the actual sort */
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qsort(lines,linecount,sizeof(char *),compare_keys);
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/* handle -u */
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if(global_flags&FLAG_u) {
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for(flag=0,i=1;i<linecount;i++) {
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if(!compare_keys(&lines[flag],&lines[i])) free(lines[i]);
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else lines[++flag]=lines[i];
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}
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if(linecount) linecount=flag+1;
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}
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/* Print it */
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if(!outfile) outfile=stdout;
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for(i=0;i<linecount;i++) fprintf(outfile,"%s\n",lines[i]);
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bb_fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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