641 lines
17 KiB
C
641 lines
17 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 source tree.
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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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//config:config SORT
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//config: bool "sort (7.4 kb)"
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//config: default y
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//config: help
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//config: sort is used to sort lines of text in specified files.
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//config:
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//config:config FEATURE_SORT_BIG
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//config: bool "Full SuSv3 compliant sort (support -ktcbdfiozgM)"
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//config: default y
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//config: depends on SORT
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//config: help
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//config: Without this, sort only supports -r, -u, -s, and an integer version
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//config: of -n. Selecting this adds sort keys, floating point support, and
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//config: more. This adds a little over 3k to a nonstatic build on x86.
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//config:
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//config: The SuSv3 sort standard is available at:
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//config: http://www.opengroup.org/onlinepubs/007904975/utilities/sort.html
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//config:
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//config:config FEATURE_SORT_OPTIMIZE_MEMORY
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//config: bool "Use less memory (but might be slower)"
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//config: default n # defaults to N since we are size-paranoid tribe
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//config: depends on SORT
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//config: help
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//config: Attempt to use less memory (by storing only one copy
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//config: of duplicated lines, and such). Useful if you work on huge files.
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//applet:IF_SORT(APPLET_NOEXEC(sort, sort, BB_DIR_USR_BIN, BB_SUID_DROP, sort))
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//kbuild:lib-$(CONFIG_SORT) += sort.o
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//usage:#define sort_trivial_usage
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//usage: "[-nru"
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//usage: IF_FEATURE_SORT_BIG("gMcszbdfiokt] [-o FILE] [-k start[.offset][opts][,end[.offset][opts]] [-t CHAR")
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//usage: "] [FILE]..."
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//usage:#define sort_full_usage "\n\n"
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//usage: "Sort lines of text\n"
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//usage: IF_FEATURE_SORT_BIG(
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//usage: "\n -o FILE Output to FILE"
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//usage: "\n -c Check whether input is sorted"
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//usage: "\n -b Ignore leading blanks"
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//usage: "\n -f Ignore case"
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//usage: "\n -i Ignore unprintable characters"
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//usage: "\n -d Dictionary order (blank or alphanumeric only)"
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//usage: )
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//-h, --human-numeric-sort: compare human readable numbers (e.g., 2K 1G)
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//usage: "\n -n Sort numbers"
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//usage: IF_FEATURE_SORT_BIG(
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//usage: "\n -g General numerical sort"
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//usage: "\n -M Sort month"
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//usage: "\n -t CHAR Field separator"
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//usage: "\n -k N[,M] Sort by Nth field"
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//usage: )
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//usage: "\n -r Reverse sort order"
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//usage: "\n -s Stable (don't sort ties alphabetically)"
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//usage: "\n -u Suppress duplicate lines"
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//usage: IF_FEATURE_SORT_BIG(
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//usage: "\n -z Lines are terminated by NUL, not newline"
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///////: "\n -m Ignored for GNU compatibility"
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///////: "\n -S BUFSZ Ignored for GNU compatibility"
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///////: "\n -T TMPDIR Ignored for GNU compatibility"
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//usage: )
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//usage:
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//usage:#define sort_example_usage
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//usage: "$ echo -e \"e\\nf\\nb\\nd\\nc\\na\" | sort\n"
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//usage: "a\n"
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//usage: "b\n"
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//usage: "c\n"
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//usage: "d\n"
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//usage: "e\n"
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//usage: "f\n"
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//usage: IF_FEATURE_SORT_BIG(
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//usage: "$ echo -e \"c 3\\nb 2\\nd 2\" | $SORT -k 2,2n -k 1,1r\n"
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//usage: "d 2\n"
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//usage: "b 2\n"
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//usage: "c 3\n"
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//usage: )
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//usage: ""
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#include "libbb.h"
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/* These are sort types */
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enum {
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FLAG_n = 1, /* Numeric sort */
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FLAG_g = 2, /* Sort using strtod() */
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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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FLAG_u = 8, /* Unique */
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FLAG_c = 0x10, /* Check: no output, exit(!ordered) */
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FLAG_s = 0x20, /* Stable sort, no ascii fallback at end */
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FLAG_z = 0x40, /* Input and output is NUL terminated, not \n */
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/* These can be applied to search keys, the previous four can't */
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FLAG_b = 0x80, /* Ignore leading blanks */
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FLAG_r = 0x100, /* Reverse */
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FLAG_d = 0x200, /* Ignore !(isalnum()|isspace()) */
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FLAG_f = 0x400, /* Force uppercase */
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FLAG_i = 0x800, /* Ignore !isprint() */
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FLAG_m = 0x1000, /* ignored: merge already sorted files; do not sort */
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FLAG_S = 0x2000, /* ignored: -S, --buffer-size=SIZE */
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FLAG_T = 0x4000, /* ignored: -T, --temporary-directory=DIR */
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FLAG_o = 0x8000,
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FLAG_k = 0x10000,
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FLAG_t = 0x20000,
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FLAG_bb = 0x80000000, /* Ignore trailing blanks */
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FLAG_no_tie_break = 0x40000000,
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};
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static const char sort_opt_str[] ALIGN1 = "^"
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"ngMucszbrdfimS:T:o:k:*t:"
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"\0" "o--o:t--t"/*-t, -o: at most one of each*/;
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/*
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* OPT_STR must not be string literal, needs to have stable address:
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* code uses "strchr(OPT_STR,c) - OPT_STR" idiom.
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*/
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#define OPT_STR (sort_opt_str + 1)
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#if ENABLE_FEATURE_SORT_BIG
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static char key_separator;
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static struct sort_key {
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struct sort_key *next_key; /* linked list */
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unsigned range[4]; /* start word, start char, end word, end char */
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unsigned flags;
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} *key_list;
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/* This is a NOEXEC applet. Be very careful! */
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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 = start; /* for compiler */
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int end;
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int len, j;
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unsigned i;
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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))
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) {
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return str;
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}
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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])
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end = len;
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/* Loop through fields */
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else {
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unsigned char ch = 0;
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end = 0;
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for (i = 1; i < key->range[2*j] + j; i++) {
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if (key_separator) {
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/* Skip body of key and separator */
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while ((ch = str[end]) != '\0') {
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end++;
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if (ch == key_separator)
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break;
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}
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} else {
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/* Skip leading blanks */
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while (isspace(str[end]))
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end++;
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/* Skip body of key */
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while (str[end] != '\0') {
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if (isspace(str[end]))
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break;
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end++;
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}
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}
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}
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/* Remove last delim: "abc:def:" => "abc:def" */
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if (j && ch) {
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//if (str[end-1] != key_separator)
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// bb_error_msg(_and_die("BUG! "
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// "str[start:%d,end:%d]:'%.*s'",
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// start, end, (int)(end-start), &str[start]);
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end--;
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}
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}
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if (!j) start = end;
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}
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/* Strip leading whitespace if necessary */
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if (flags & FLAG_b)
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/* not using skip_whitespace() for speed */
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while (isspace(str[start])) start++;
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/* Strip trailing whitespace if necessary */
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if (flags & FLAG_bb)
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while (end > start && isspace(str[end-1])) end--;
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/* -kSTART,N.ENDCHAR: honor ENDCHAR (1-based) */
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if (key->range[3]) {
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end = key->range[3];
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if (end > len) end = len;
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}
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/* -kN.STARTCHAR[,...]: honor STARTCHAR (1-based) */
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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)
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end = start;
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str = 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]))
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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_asciionly(str[end]))
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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)
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for (i = 0; str[i]; i++)
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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)
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pkey = &((*pkey)->next_key);
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return *pkey = xzalloc(sizeof(struct sort_key));
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}
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#define GET_LINE(fp) \
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((option_mask32 & FLAG_z) \
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? bb_get_chunk_from_file(fp, NULL) \
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: xmalloc_fgetline(fp))
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#else
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#define GET_LINE(fp) xmalloc_fgetline(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 = option_mask32, retval = 0;
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char *x, *y;
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#if ENABLE_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 : option_mask32;
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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 & (FLAG_n | FLAG_M | FLAG_g)) {
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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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#if ENABLE_LOCALE_SUPPORT
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retval = strcoll(x, y);
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#else
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retval = strcmp(x, y);
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#endif
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break;
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#if ENABLE_FEATURE_SORT_BIG
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case FLAG_g: {
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char *xx, *yy;
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double dx = strtod(x, &xx);
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double dy = strtod(y, &yy);
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/* not numbers < NaN < -infinity < numbers < +infinity) */
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if (x == xx)
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retval = (y == yy ? 0 : -1);
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else if (y == yy)
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retval = 1;
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/* Check for isnan */
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else if (dx != dx)
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retval = (dy != dy) ? 0 : -1;
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else if (dy != dy)
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retval = 1;
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/* Check for infinity. Could underflow, but it avoids libm. */
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else if (1.0 / dx == 0.0) {
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if (dx < 0)
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retval = (1.0 / dy == 0.0 && dy < 0) ? 0 : -1;
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else
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retval = (1.0 / dy == 0.0 && dy > 0) ? 0 : 1;
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} else if (1.0 / dy == 0.0)
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retval = (dy < 0) ? 1 : -1;
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else
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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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case FLAG_M: {
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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)
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retval = (!yy) ? 0 : -1;
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else if (!yy)
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retval = 1;
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else
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retval = 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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double dx = atof(x);
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double 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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} /* switch */
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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; - done by for () anyway */
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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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} /* switch */
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#endif
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} /* for */
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if (retval == 0) {
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/* So far lines are "the same" */
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if (option_mask32 & FLAG_s) {
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/* "Stable sort": later line is "greater than",
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* IOW: do not allow qsort() to swap equal lines.
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*/
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uint32_t *p32;
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uint32_t x32, y32;
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char *line;
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unsigned len;
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line = *(char**)xarg;
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len = (strlen(line) + 4) & (~3u);
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p32 = (void*)(line + len);
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x32 = *p32;
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line = *(char**)yarg;
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len = (strlen(line) + 4) & (~3u);
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p32 = (void*)(line + len);
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y32 = *p32;
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/* If x > y, 1, else -1 */
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retval = (x32 > y32) * 2 - 1;
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} else
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if (!(option_mask32 & FLAG_no_tie_break)) {
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/* fallback sort */
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flags = option_mask32;
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retval = strcmp(*(char **)xarg, *(char **)yarg);
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}
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}
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if (flags & FLAG_r)
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return -retval;
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return retval;
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}
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#if ENABLE_FEATURE_SORT_BIG
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static unsigned str2u(char **str)
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{
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unsigned long lu;
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if (!isdigit((*str)[0]))
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bb_error_msg_and_die("bad field specification");
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lu = strtoul(*str, str, 10);
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if ((sizeof(long) > sizeof(int) && lu > INT_MAX) || !lu)
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bb_error_msg_and_die("bad field specification");
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return lu;
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}
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#endif
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int sort_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int sort_main(int argc UNUSED_PARAM, char **argv)
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{
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char **lines;
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char *str_ignored, *str_o, *str_t;
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llist_t *lst_k = NULL;
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int i;
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int linecount;
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unsigned opts;
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#if ENABLE_FEATURE_SORT_OPTIMIZE_MEMORY
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bool can_drop_dups;
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size_t prev_len = 0;
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/* Postpone optimizing if the input is small, < 16k lines:
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* even just free()ing duplicate lines takes time.
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*/
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size_t count_to_optimize_dups = 0x3fff;
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#endif
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xfunc_error_retval = 2;
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/* Parse command line options */
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opts = getopt32(argv,
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sort_opt_str,
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&str_ignored, &str_ignored, &str_o, &lst_k, &str_t
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);
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#if ENABLE_FEATURE_SORT_OPTIMIZE_MEMORY
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/* Can drop dups only if -u but no "complicating" options,
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* IOW: if we do a full line compares. Safe options:
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* -o FILE Output to FILE
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* -z Lines are terminated by NUL, not newline
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* -r Reverse sort order
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* -s Stable (don't sort ties alphabetically)
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* Not sure about these:
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* -b Ignore leading blanks
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* -f Ignore case
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* -i Ignore unprintable characters
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* -d Dictionary order (blank or alphanumeric only)
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* -n Sort numbers
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* -g General numerical sort
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* -M Sort month
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*/
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can_drop_dups = ((opts & ~(FLAG_o|FLAG_z|FLAG_r|FLAG_s)) == FLAG_u);
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/* Stable sort needs every line to be uniquely allocated,
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* disable optimization to reuse strings:
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*/
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if (opts & FLAG_s)
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count_to_optimize_dups = (size_t)-1L;
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#endif
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/* global b strips leading and trailing spaces */
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if (opts & FLAG_b)
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option_mask32 |= FLAG_bb;
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#if ENABLE_FEATURE_SORT_BIG
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if (opts & FLAG_t) {
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if (!str_t[0] || str_t[1])
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bb_error_msg_and_die("bad -t parameter");
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key_separator = str_t[0];
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}
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/* note: below this point we use option_mask32, not opts,
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* since that reduces register pressure and makes code smaller */
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/* Parse sort key */
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while (lst_k) {
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enum {
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FLAG_allowed_for_k =
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FLAG_n | /* Numeric sort */
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FLAG_g | /* Sort using strtod() */
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FLAG_M | /* Sort date */
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FLAG_b | /* Ignore leading blanks */
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FLAG_r | /* Reverse */
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FLAG_d | /* Ignore !(isalnum()|isspace()) */
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FLAG_f | /* Force uppercase */
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FLAG_i | /* Ignore !isprint() */
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0
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};
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struct sort_key *key = add_key();
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char *str_k = llist_pop(&lst_k);
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|
|
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) {
|
|
int flag;
|
|
const char *idx;
|
|
|
|
if (*str_k == ',' && !i++) {
|
|
str_k++;
|
|
break;
|
|
} /* no else needed: fall through to syntax error
|
|
because comma isn't in OPT_STR */
|
|
idx = strchr(OPT_STR, *str_k);
|
|
if (!idx)
|
|
bb_error_msg_and_die("unknown key option");
|
|
flag = 1 << (idx - 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
|
|
|
|
/* Open input files and read data */
|
|
argv += optind;
|
|
if (!*argv)
|
|
*--argv = (char*)"-";
|
|
linecount = 0;
|
|
lines = NULL;
|
|
do {
|
|
/* coreutils 6.9 compat: abort on first open error,
|
|
* do not continue to next file: */
|
|
FILE *fp = xfopen_stdin(*argv);
|
|
for (;;) {
|
|
char *line = GET_LINE(fp);
|
|
if (!line)
|
|
break;
|
|
|
|
#if ENABLE_FEATURE_SORT_OPTIMIZE_MEMORY
|
|
if (count_to_optimize_dups != 0)
|
|
count_to_optimize_dups--;
|
|
if (count_to_optimize_dups == 0) {
|
|
size_t len;
|
|
char *new_line;
|
|
char first = *line;
|
|
|
|
/* On kernel/linux/arch/ *.[ch] files,
|
|
* this reduces memory usage by 6%.
|
|
* yes | head -99999999 | sort
|
|
* goes down from 1900Mb to 380 Mb.
|
|
*/
|
|
if (first == '\0' || first == '\n') {
|
|
len = !(first == '\0');
|
|
new_line = (char*)"\n" + 1 - len;
|
|
goto replace;
|
|
}
|
|
len = strlen(line);
|
|
if (len <= prev_len) {
|
|
new_line = lines[linecount-1] + (prev_len - len);
|
|
if (strcmp(line, new_line) == 0) {
|
|
if (can_drop_dups && prev_len == len) {
|
|
free(line);
|
|
continue;
|
|
}
|
|
replace:
|
|
free(line);
|
|
line = new_line;
|
|
}
|
|
}
|
|
prev_len = len;
|
|
}
|
|
#else
|
|
//TODO: lighter version which only drops total dups if can_drop_dups == true
|
|
#endif
|
|
lines = xrealloc_vector(lines, 6, linecount);
|
|
lines[linecount++] = line;
|
|
}
|
|
fclose_if_not_stdin(fp);
|
|
} while (*++argv);
|
|
|
|
#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 %u\n", i);
|
|
return EXIT_FAILURE;
|
|
}
|
|
}
|
|
return EXIT_SUCCESS;
|
|
}
|
|
#endif
|
|
|
|
/* For stable sort, store original line position beyond terminating NUL */
|
|
if (option_mask32 & FLAG_s) {
|
|
for (i = 0; i < linecount; i++) {
|
|
uint32_t *p32;
|
|
char *line;
|
|
unsigned len;
|
|
|
|
line = lines[i];
|
|
len = (strlen(line) + 4) & (~3u);
|
|
lines[i] = line = xrealloc(line, len + 4);
|
|
p32 = (void*)(line + len);
|
|
*p32 = i;
|
|
}
|
|
/*option_mask32 |= FLAG_no_tie_break;*/
|
|
/* ^^^redundant: if FLAG_s, compare_keys() does no tie break */
|
|
}
|
|
|
|
/* Perform the actual sort */
|
|
qsort(lines, linecount, sizeof(lines[0]), compare_keys);
|
|
|
|
/* Handle -u */
|
|
if (option_mask32 & FLAG_u) {
|
|
int j = 0;
|
|
/* coreutils 6.3 drop lines for which only key is the same
|
|
* -- disabling last-resort compare, or else compare_keys()
|
|
* will be the same only for completely identical lines.
|
|
*/
|
|
option_mask32 |= FLAG_no_tie_break;
|
|
for (i = 1; i < linecount; i++) {
|
|
if (compare_keys(&lines[j], &lines[i]) == 0)
|
|
free(lines[i]);
|
|
else
|
|
lines[++j] = lines[i];
|
|
}
|
|
if (linecount)
|
|
linecount = j+1;
|
|
}
|
|
|
|
/* Print it */
|
|
#if ENABLE_FEATURE_SORT_BIG
|
|
/* Open output file _after_ we read all input ones */
|
|
if (option_mask32 & FLAG_o)
|
|
xmove_fd(xopen(str_o, O_WRONLY|O_CREAT|O_TRUNC), STDOUT_FILENO);
|
|
#endif
|
|
{
|
|
int ch = (option_mask32 & FLAG_z) ? '\0' : '\n';
|
|
for (i = 0; i < linecount; i++)
|
|
printf("%s%c", lines[i], ch);
|
|
}
|
|
|
|
fflush_stdout_and_exit(EXIT_SUCCESS);
|
|
}
|