* Mini uniq implementation for busybox
*
*
- * Copyright (C) 1999,2000 by Lineo, inc.
+ * Copyright (C) 1999,2000,2001 by Lineo, inc.
* Written by John Beppu <beppu@lineo.com>
+ * Rewritten 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 <stdio.h>
#include <string.h>
+#include <getopt.h>
#include <errno.h>
+#include <stdlib.h>
+#include "busybox.h"
-static const char uniq_usage[] =
- "uniq [OPTION]... [INPUT [OUTPUT]]\n"
-#ifndef BB_FEATURE_TRIVIAL_HELP
- "\nDiscard all but one of successive identical lines from INPUT\n"
- "(or standard input), writing to OUTPUT (or standard output).\n"
-#endif
- ;
+static int print_count;
+static int print_uniq = 1;
+static int print_duplicates = 1;
-/* max chars in line */
-#define UNIQ_MAX 4096
-
-typedef void (Print) (FILE *, const char *);
-
-typedef int (Decide) (const char *, const char *);
-
-/* container for two lines to be compared */
-typedef struct {
- char *a;
- char *b;
- int recurrence;
- FILE *in;
- FILE *out;
- void *func;
-} Subject;
-
-/* set up all the variables of a uniq operation */
-static Subject *subject_init(Subject * self, FILE * in, FILE * out,
- void *func)
-{
- self->a = NULL;
- self->b = NULL;
- self->in = in;
- self->out = out;
- self->func = func;
- self->recurrence = 0;
- return self;
-}
-
-/* point a and b to the appropriate lines;
- * count the recurrences (if any) of a string;
- */
-static Subject *subject_next(Subject * self)
+static void print_line(char *line, int count, FILE *fp)
{
- /* tmp line holders */
- static char line[2][UNIQ_MAX];
- static int alternator = 0;
-
- if (fgets(line[alternator], UNIQ_MAX, self->in)) {
- self->a = self->b;
- self->b = line[alternator];
- alternator ^= 1;
- return self;
+ if ((print_duplicates && count > 1) || (print_uniq && count == 1)) {
+ if (print_count)
+ fprintf(fp, "%7d\t%s", count, line);
+ else
+ fputs(line, fp);
}
-
- return NULL;
-}
-
-static Subject *subject_last(Subject * self)
-{
- self->a = self->b;
- self->b = NULL;
- return self;
}
-static Subject *subject_study(Subject * self)
-{
- if (self->a == NULL) {
- return self;
- }
- if (self->b == NULL) {
- fprintf(self->out, "%s", self->a);
- return self;
- }
- if (strcmp(self->a, self->b) == 0) {
- self->recurrence++;
- } else {
- fprintf(self->out, "%s", self->a);
- self->recurrence = 0;
- }
- return self;
-}
-
-static int
-set_file_pointers(int schema, FILE ** in, FILE ** out, char **argv)
-{
- switch (schema) {
- case 0:
- *in = stdin;
- *out = stdout;
- break;
- case 1:
- *in = fopen(argv[0], "r");
- *out = stdout;
- break;
- case 2:
- *in = fopen(argv[0], "r");
- *out = fopen(argv[1], "w");
- break;
- }
- if (*in == NULL) {
- fprintf(stderr, "uniq: %s: %s\n", argv[0], strerror(errno));
- return errno;
- }
- if (*out == NULL) {
- fprintf(stderr, "uniq: %s: %s\n", argv[1], strerror(errno));
- return errno;
- }
- return 0;
-}
-
-
-/* one variable is the decision algo */
-/* another variable is the printing algo */
-
-/* I don't think I have to have more than a 1 line memory
- this is the one constant */
-
-/* it seems like GNU/uniq only takes one or two files as an option */
-
-/* ________________________________________________________________________ */
int uniq_main(int argc, char **argv)
{
- int i;
- char opt;
- FILE *in, *out;
- Subject s;
+ FILE *in = stdin, *out = stdout;
+ char *lastline = NULL, *input;
+ int opt, count = 0;
/* parse argv[] */
- for (i = 1; i < argc; i++) {
- if (argv[i][0] == '-') {
- opt = argv[i][1];
- switch (opt) {
- case '-':
- case 'h':
- usage(uniq_usage);
- default:
- usage(uniq_usage);
- }
- } else {
- break;
+ while ((opt = getopt(argc, argv, "cdu")) > 0) {
+ switch (opt) {
+ case 'c':
+ print_count = 1;
+ break;
+ case 'd':
+ print_duplicates = 1;
+ print_uniq = 0;
+ break;
+ case 'u':
+ print_duplicates = 0;
+ print_uniq = 1;
+ break;
}
}
- /* 0 src: stdin; dst: stdout */
- /* 1 src: file; dst: stdout */
- /* 2 src: file; dst: file */
- if (set_file_pointers((argc - 1), &in, &out, &argv[i])) {
- exit(1);
+ if (argv[optind] != NULL) {
+ in = xfopen(argv[optind], "r");
+ if (argv[optind+1] != NULL)
+ out = xfopen(argv[optind+1], "w");
}
- subject_init(&s, in, out, NULL);
- while (subject_next(&s)) {
- subject_study(&s);
+ while ((input = get_line_from_file(in)) != NULL) {
+ if (lastline == NULL || strcmp(input, lastline) != 0) {
+ print_line(lastline, count, out);
+ free(lastline);
+ lastline = input;
+ count = 0;
+ }
+ count++;
}
- subject_last(&s);
- subject_study(&s);
+ print_line(lastline, count, out);
+ free(lastline);
- exit(0);
+ return EXIT_SUCCESS;
}
-
-/* $Id: uniq.c,v 1.10 2000/05/12 19:41:47 erik Exp $ */
projects / oweals / busybox.git / blobdiff