//config: sort is used to sort lines of text in specified files.
//config:
//config:config FEATURE_SORT_BIG
-//config: bool "Full SuSv3 compliant sort (support -ktcsbdfiozgM)"
+//config: bool "Full SuSv3 compliant sort (support -ktcbdfiogM)"
//config: default y
//config: depends on SORT
//config: help
-//config: Without this, sort only supports -r, -u, and an integer version
+//config: Without this, sort only supports -rusz, and an integer version
//config: of -n. Selecting this adds sort keys, floating point support, and
//config: more. This adds a little over 3k to a nonstatic build on x86.
//config:
//config: The SuSv3 sort standard is available at:
//config: http://www.opengroup.org/onlinepubs/007904975/utilities/sort.html
+//config:
+//config:config FEATURE_SORT_OPTIMIZE_MEMORY
+//config: bool "Use less memory (but might be slower)"
+//config: default n # defaults to N since we are size-paranoid tribe
+//config: depends on SORT
+//config: help
+//config: Attempt to use less memory (by storing only one copy
+//config: of duplicated lines, and such). Useful if you work on huge files.
//applet:IF_SORT(APPLET_NOEXEC(sort, sort, BB_DIR_USR_BIN, BB_SUID_DROP, sort))
//usage: "\n -f Ignore case"
//usage: "\n -i Ignore unprintable characters"
//usage: "\n -d Dictionary order (blank or alphanumeric only)"
-//usage: "\n -g General numerical sort"
-//usage: "\n -M Sort month"
//usage: )
//-h, --human-numeric-sort: compare human readable numbers (e.g., 2K 1G)
//usage: "\n -n Sort numbers"
//usage: IF_FEATURE_SORT_BIG(
+//usage: "\n -g General numerical sort"
+//usage: "\n -M Sort month"
+//usage: "\n -V Sort version"
//usage: "\n -t CHAR Field separator"
//usage: "\n -k N[,M] Sort by Nth field"
//usage: )
//usage: "\n -r Reverse sort order"
-//usage: IF_FEATURE_SORT_BIG(
//usage: "\n -s Stable (don't sort ties alphabetically)"
-//usage: )
//usage: "\n -u Suppress duplicate lines"
-//usage: IF_FEATURE_SORT_BIG(
//usage: "\n -z Lines are terminated by NUL, not newline"
///////: "\n -m Ignored for GNU compatibility"
///////: "\n -S BUFSZ Ignored for GNU compatibility"
///////: "\n -T TMPDIR Ignored for GNU compatibility"
-//usage: )
//usage:
//usage:#define sort_example_usage
//usage: "$ echo -e \"e\\nf\\nb\\nd\\nc\\na\" | sort\n"
#include "libbb.h"
-/* This is a NOEXEC applet. Be very careful! */
-
-
-/*
- sort [-m][-o output][-bdfinru][-t char][-k keydef]... [file...]
- sort -c [-bdfinru][-t char][-k keydef][file]
-*/
-
/* These are sort types */
-#define OPT_STR "ngMucszbrdfimS:T:o:k:*t:"
enum {
- FLAG_n = 1, /* Numeric sort */
- FLAG_g = 2, /* Sort using strtod() */
- FLAG_M = 4, /* Sort date */
+ FLAG_n = 1 << 0, /* Numeric sort */
+ FLAG_g = 1 << 1, /* Sort using strtod() */
+ FLAG_M = 1 << 2, /* Sort date */
+ FLAG_V = 1 << 3, /* Sort version */
/* ucsz apply to root level only, not keys. b at root level implies bb */
- FLAG_u = 8, /* Unique */
- FLAG_c = 0x10, /* Check: no output, exit(!ordered) */
- FLAG_s = 0x20, /* Stable sort, no ascii fallback at end */
- FLAG_z = 0x40, /* Input and output is NUL terminated, not \n */
+ FLAG_u = 1 << 4, /* Unique */
+ FLAG_c = 1 << 5, /* Check: no output, exit(!ordered) */
+ FLAG_s = 1 << 6, /* Stable sort, no ascii fallback at end */
+ FLAG_z = 1 << 7, /* Input and output is NUL terminated, not \n */
/* These can be applied to search keys, the previous four can't */
- FLAG_b = 0x80, /* Ignore leading blanks */
- FLAG_r = 0x100, /* Reverse */
- FLAG_d = 0x200, /* Ignore !(isalnum()|isspace()) */
- FLAG_f = 0x400, /* Force uppercase */
- FLAG_i = 0x800, /* Ignore !isprint() */
- FLAG_m = 0x1000, /* ignored: merge already sorted files; do not sort */
- FLAG_S = 0x2000, /* ignored: -S, --buffer-size=SIZE */
- FLAG_T = 0x4000, /* ignored: -T, --temporary-directory=DIR */
- FLAG_o = 0x8000,
- FLAG_k = 0x10000,
- FLAG_t = 0x20000,
+ FLAG_b = 1 << 8, /* Ignore leading blanks */
+ FLAG_r = 1 << 9, /* Reverse */
+ FLAG_d = 1 << 10, /* Ignore !(isalnum()|isspace()) */
+ FLAG_f = 1 << 11, /* Force uppercase */
+ FLAG_i = 1 << 12, /* Ignore !isprint() */
+ FLAG_m = 1 << 13, /* ignored: merge already sorted files; do not sort */
+ FLAG_S = 1 << 14, /* ignored: -S, --buffer-size=SIZE */
+ FLAG_T = 1 << 15, /* ignored: -T, --temporary-directory=DIR */
+ FLAG_o = 1 << 16,
+ FLAG_k = 1 << 17,
+ FLAG_t = 1 << 18,
FLAG_bb = 0x80000000, /* Ignore trailing blanks */
FLAG_no_tie_break = 0x40000000,
};
+static const char sort_opt_str[] ALIGN1 = "^"
+ "ngMVucszbrdfimS:T:o:k:*t:"
+ "\0" "o--o:t--t"/*-t, -o: at most one of each*/;
+/*
+ * OPT_STR must not be string literal, needs to have stable address:
+ * code uses "strchr(OPT_STR,c) - OPT_STR" idiom.
+ */
+#define OPT_STR (sort_opt_str + 1)
+
#if ENABLE_FEATURE_SORT_BIG
static char key_separator;
unsigned flags;
} *key_list;
+
+/* This is a NOEXEC applet. Be very careful! */
+
+
static char *get_key(char *str, struct sort_key *key, int flags)
{
int start = start; /* for compiler */
y = *(char **)yarg;
#endif
/* Perform actual comparison */
- switch (flags & (FLAG_n | FLAG_M | FLAG_g)) {
+ switch (flags & (FLAG_n | FLAG_g | FLAG_M | FLAG_V)) {
default:
bb_error_msg_and_die("unknown sort type");
break;
+#if defined(HAVE_STRVERSCMP) && HAVE_STRVERSCMP == 1
+ case FLAG_V:
+ retval = strverscmp(x, y);
+ break;
+#endif
/* Ascii sort */
case 0:
#if ENABLE_LOCALE_SUPPORT
int i;
int linecount;
unsigned opts;
+#if ENABLE_FEATURE_SORT_OPTIMIZE_MEMORY
+ bool can_drop_dups;
+ size_t prev_len = 0;
+ char *prev_line = (char*) "";
+ /* Postpone optimizing if the input is small, < 16k lines:
+ * even just free()ing duplicate lines takes time.
+ */
+ size_t count_to_optimize_dups = 0x3fff;
+#endif
xfunc_error_retval = 2;
/* Parse command line options */
- opts = getopt32(argv, "^"
- OPT_STR
- "\0" "o--o:t--t"/*-t, -o: at most one of each*/,
+ opts = getopt32(argv,
+ sort_opt_str,
&str_ignored, &str_ignored, &str_o, &lst_k, &str_t
);
+#if ENABLE_FEATURE_SORT_OPTIMIZE_MEMORY
+ /* Can drop dups only if -u but no "complicating" options,
+ * IOW: if we do a full line compares. Safe options:
+ * -o FILE Output to FILE
+ * -z Lines are terminated by NUL, not newline
+ * -r Reverse sort order
+ * -s Stable (don't sort ties alphabetically)
+ * Not sure about these:
+ * -b Ignore leading blanks
+ * -f Ignore case
+ * -i Ignore unprintable characters
+ * -d Dictionary order (blank or alphanumeric only)
+ * -n Sort numbers
+ * -g General numerical sort
+ * -M Sort month
+ */
+ can_drop_dups = ((opts & ~(FLAG_o|FLAG_z|FLAG_r|FLAG_s)) == FLAG_u);
+ /* Stable sort needs every line to be uniquely allocated,
+ * disable optimization to reuse strings:
+ */
+ if (opts & FLAG_s)
+ count_to_optimize_dups = (size_t)-1L;
+#endif
/* global b strips leading and trailing spaces */
if (opts & FLAG_b)
option_mask32 |= FLAG_bb;
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;
+
+ /* On kernel/linux/arch/ *.[ch] files,
+ * this reduces memory usage by 6%.
+ * yes | head -99999999 | sort
+ * goes down from 1900Mb to 380 Mb.
+ */
+ len = strlen(line);
+ if (len <= prev_len) {
+ new_line = prev_line + (prev_len - len);
+ if (strcmp(line, new_line) == 0) {
+ /* it's a tail of the prev line */
+ if (can_drop_dups && prev_len == len) {
+ /* it's identical to prev line */
+ free(line);
+ continue;
+ }
+ free(line);
+ line = new_line;
+ /* continue using longer prev_line
+ * for future tail tests.
+ */
+ goto skip;
+ }
+ }
+ prev_len = len;
+ prev_line = line;
+ skip: ;
+ }
+#else
+//TODO: lighter version which only drops total dups if can_drop_dups == true
+#endif
lines = xrealloc_vector(lines, 6, linecount);
lines[linecount++] = line;
}