* Mini sort implementation for busybox
*
*
- * Copyright (C) 1999,2000 by Lineo, inc.
- * Written by John Beppu <beppu@lineo.com>
+ * Copyright (C) 2000 by Matt Kraai <kraai@alumni.carnegiemellon.edu>
*
* 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
*
*/
-#include "internal.h"
-#include <sys/types.h>
-#include <fcntl.h>
-#include <dirent.h>
-#include <stdio.h>
-#include <errno.h>
+#include <getopt.h>
+#include <string.h>
+#include <stdlib.h>
+#include "busybox.h"
-static const char sort_usage[] = "sort [-n]"
-#ifdef BB_FEATURE_SORT_REVERSE
-" [-r]"
-#endif
-" [FILE]...\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
-"\nSorts lines of text in the specified files\n"
-#endif
-;
-
-#ifdef BB_FEATURE_SORT_REVERSE
-#define APPLY_REVERSE(x) (reverse ? -(x) : (x))
-static int reverse = 0;
-#else
-#define APPLY_REVERSE(x) (x)
-#endif
-
-/* 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()
+static int compare_ascii(const void *x, const void *y)
{
- Line *self;
- self = malloc(1 * sizeof(Line));
- return self;
-}
-
-/* Construct Line from FILE* */
-static Line *line_newFromFile(FILE * src)
-{
- Line *self;
- char *cstring = NULL;
-
- if ((cstring = cstring_lineFromFile(src))) {
- self = line_alloc();
- if (self == NULL) {
- return NULL;
- }
- self->data = cstring;
- self->next = NULL;
- return self;
- }
- return NULL;
+ return strcmp(*(char **)x, *(char **)y);
}
-/* Line destructor */
-static Line *line_release(Line * self)
+static int compare_numeric(const void *x, const void *y)
{
- if (self->data) {
- free(self->data);
- free(self);
- }
- return self;
+ int z = atoi(*(char **)x) - atoi(*(char **)y);
+ return z ? z : strcmp(*(char **)x, *(char **)y);
}
-
-/* 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 APPLY_REVERSE(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;
-
- doh = (Line **) a;
- x = *doh;
- doh = (Line **) b;
- y = *doh;
-
- xint = strtoul(x->data, NULL, 10);
- yint = strtoul(y->data, NULL, 10);
-
- return APPLY_REVERSE(xint - yint);
-}
-
-
-/* List */
-
-/* */
-static List *list_init(List * self)
-{
- self->len = 0;
- self->sorted = NULL;
- self->head = NULL;
- self->current = NULL;
- return self;
-}
-
-/* for simplicity, the List gains ownership of the line */
-static List *list_insert(List * self, Line * line)
-{
- if (line == NULL) {
- return NULL;
- }
-
- /* first insertion */
- if (self->head == NULL) {
- self->head = line;
- self->current = line;
-
- /* all subsequent insertions */
- } else {
- self->current->next = line;
- self->current = line;
- }
- self->len++;
- return self;
-}
-
-/* order the list according to compare() */
-static List *list_sort(List * self, Compare * compare)
-{
- 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;
-}
-
-/* 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;
-}
-
-/* deallocate */
-static void list_release(List * self)
-{
- Line *i;
- Line *die;
-
- i = self->head;
- while (i) {
- die = i;
- i = die->next;
- line_release(die);
- }
-}
-
-
-
int sort_main(int argc, char **argv)
{
- int i;
- char opt;
- List list;
- Line *l;
- Compare *compare;
-
- /* init */
- compare = compare_ascii;
- list_init(&list);
+ FILE *fp;
+ char *line, **lines = NULL;
+ int i, opt, nlines = 0;
+ int (*compare)(const void *, const void *) = compare_ascii;
+#ifdef CONFIG_FEATURE_SORT_REVERSE
+ int reverse = FALSE;
+#endif
+#ifdef CONFIG_FEATURE_SORT_UNIQUE
+ int unique = FALSE;
+#endif
- /* parse argv[] */
- for (i = 1; i < argc; i++) {
- if (argv[i][0] == '-') {
- opt = argv[i][1];
- switch (opt) {
- case 'h':
- usage(sort_usage);
- break;
+ while ((opt = getopt(argc, argv, "nru")) != -1) {
+ switch (opt) {
case 'n':
- /* numeric comparison */
compare = compare_numeric;
break;
-#ifdef BB_FEATURE_SORT_REVERSE
+#ifdef CONFIG_FEATURE_SORT_REVERSE
case 'r':
- /* reverse */
- reverse = 1;
+ reverse = TRUE;
+ break;
+#endif
+#ifdef CONFIG_FEATURE_SORT_UNIQUE
+ case 'u':
+ unique = TRUE;
break;
#endif
default:
- fprintf(stderr, "sort: invalid option -- %c\n", opt);
- usage(sort_usage);
- }
- } else {
- break;
+ show_usage();
}
}
- /* this could be factored better */
-
- /* work w/ stdin */
- if (i >= argc) {
- while ((l = line_newFromFile(stdin))) {
- list_insert(&list, l);
- }
- 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);
+ /* read the input */
+ for (i = optind; i == optind || i < argc; i++) {
+ if (argv[i] == NULL)
+ fp = stdin;
+ else
+ fp = xfopen(argv[i], "r");
+
+ while ((line = get_line_from_file(fp)) != NULL) {
+ lines = xrealloc(lines, sizeof(char *) * (nlines + 1));
+ chomp(line);
+ lines[nlines++] = line;
}
- list_sort(&list, compare);
- list_writeToFile(&list, stdout);
- list_release(&list);
}
- return(0);
-}
+ /* sort it */
+ qsort(lines, nlines, sizeof(char *), compare);
-/* $Id: sort.c,v 1.17 2000/06/19 17:25:40 andersen Exp $ */
+ /* print it */
+#ifdef CONFIG_FEATURE_SORT_REVERSE
+ if (reverse) {
+ for (i = --nlines; 0 <= i; i--)
+#ifdef CONFIG_FEATURE_SORT_UNIQUE
+ if((!unique) || (i == nlines) || (strcmp(lines[i + 1], lines[i])))
+#endif
+ puts(lines[i]);
+ } else
+#endif
+ for (i = 0; i < nlines; i++)
+#ifdef CONFIG_FEATURE_SORT_UNIQUE
+ if((!unique) || (!i) || (strcmp(lines[i - 1], lines[i])))
+#endif
+ puts(lines[i]);
+ return EXIT_SUCCESS;
+}
projects / oweals / busybox.git / blobdiff