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1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * strings implementation for busybox
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4 | *
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5 | * Copyright Tito Ragusa <farmatito@tiscali.it>
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6 | *
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7 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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8 | */
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9 |
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10 | #include <getopt.h>
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11 |
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12 | #include "libbb.h"
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13 |
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14 | #define WHOLE_FILE 1
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15 | #define PRINT_NAME 2
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16 | #define PRINT_OFFSET 4
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17 | #define SIZE 8
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18 |
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19 | int strings_main(int argc, char **argv);
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20 | int strings_main(int argc, char **argv)
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21 | {
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22 | int n, c, status = EXIT_SUCCESS;
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23 | unsigned opt;
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24 | unsigned count;
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25 | off_t offset;
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26 | FILE *file = stdin;
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27 | char *string;
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28 | const char *fmt = "%s: ";
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29 | const char *n_arg = "4";
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30 |
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31 | opt = getopt32(argv, "afon:", &n_arg);
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32 | /* -a is our default behaviour */
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33 | /*argc -= optind;*/
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34 | argv += optind;
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35 |
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36 | n = xatou_range(n_arg, 1, INT_MAX);
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37 | string = xzalloc(n + 1);
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38 | n--;
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39 |
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40 | if (!*argv) {
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41 | fmt = "{%s}: ";
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42 | *--argv = (char *)bb_msg_standard_input;
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43 | goto PIPE;
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44 | }
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45 |
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46 | do {
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47 | file = fopen_or_warn(*argv, "r");
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48 | if (!file) {
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49 | status = EXIT_FAILURE;
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50 | continue;
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51 | }
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52 | PIPE:
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53 | offset = 0;
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54 | count = 0;
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55 | do {
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56 | c = fgetc(file);
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57 | if (isprint(c) || c == '\t') {
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58 | if (count > n) {
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59 | putchar(c);
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60 | } else {
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61 | string[count] = c;
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62 | if (count == n) {
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63 | if (opt & PRINT_NAME) {
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64 | printf(fmt, *argv);
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65 | }
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66 | if (opt & PRINT_OFFSET) {
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67 | printf("%7"OFF_FMT"o ", offset - n);
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68 | }
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69 | fputs(string, stdout);
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70 | }
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71 | count++;
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72 | }
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73 | } else {
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74 | if (count > n) {
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75 | putchar('\n');
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76 | }
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77 | count = 0;
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78 | }
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79 | offset++;
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80 | } while (c != EOF);
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81 | fclose_if_not_stdin(file);
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82 | } while (*++argv);
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83 |
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84 | if (ENABLE_FEATURE_CLEAN_UP)
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85 | free(string);
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86 |
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87 | fflush_stdout_and_exit(status);
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88 | }
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