blob: b040508b5d25c5cb50cdd5280fd7a1220c30fb65
1 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * strings implementation for busybox |
4 | * |
5 | * Copyright 2003 Tito Ragusa <farmatito@tiscali.it> |
6 | * |
7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
8 | */ |
9 | |
10 | //usage:#define strings_trivial_usage |
11 | //usage: "[-afo] [-n LEN] [FILE]..." |
12 | //usage:#define strings_full_usage "\n\n" |
13 | //usage: "Display printable strings in a binary file\n" |
14 | //usage: "\n -a Scan whole file (default)" |
15 | //usage: "\n -f Precede strings with filenames" |
16 | //usage: "\n -n LEN At least LEN characters form a string (default 4)" |
17 | //usage: "\n -o Precede strings with decimal offsets" |
18 | |
19 | #include "libbb.h" |
20 | |
21 | #define WHOLE_FILE 1 |
22 | #define PRINT_NAME 2 |
23 | #define PRINT_OFFSET 4 |
24 | #define SIZE 8 |
25 | |
26 | int strings_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
27 | int strings_main(int argc UNUSED_PARAM, char **argv) |
28 | { |
29 | int c, status = EXIT_SUCCESS; |
30 | unsigned n, count; |
31 | off_t offset; |
32 | FILE *file; |
33 | char *string; |
34 | const char *fmt = "%s: "; |
35 | const char *n_arg = "4"; |
36 | |
37 | getopt32(argv, "afon:", &n_arg); |
38 | /* -a is our default behaviour */ |
39 | /*argc -= optind;*/ |
40 | argv += optind; |
41 | |
42 | n = xatou_range(n_arg, 1, INT_MAX); |
43 | string = xzalloc(n + 1); |
44 | n--; |
45 | |
46 | if (!*argv) { |
47 | fmt = "{%s}: "; |
48 | *--argv = (char *)bb_msg_standard_input; |
49 | } |
50 | |
51 | do { |
52 | file = fopen_or_warn_stdin(*argv); |
53 | if (!file) { |
54 | status = EXIT_FAILURE; |
55 | continue; |
56 | } |
57 | offset = 0; |
58 | count = 0; |
59 | do { |
60 | c = fgetc(file); |
61 | if (isprint_asciionly(c) || c == '\t') { |
62 | if (count > n) { |
63 | bb_putchar(c); |
64 | } else { |
65 | string[count] = c; |
66 | if (count == n) { |
67 | if (option_mask32 & PRINT_NAME) { |
68 | printf(fmt, *argv); |
69 | } |
70 | if (option_mask32 & PRINT_OFFSET) { |
71 | printf("%7"OFF_FMT"o ", offset - n); |
72 | } |
73 | fputs(string, stdout); |
74 | } |
75 | count++; |
76 | } |
77 | } else { |
78 | if (count > n) { |
79 | bb_putchar('\n'); |
80 | } |
81 | count = 0; |
82 | } |
83 | offset++; |
84 | } while (c != EOF); |
85 | fclose_if_not_stdin(file); |
86 | } while (*++argv); |
87 | |
88 | if (ENABLE_FEATURE_CLEAN_UP) |
89 | free(string); |
90 | |
91 | fflush_stdout_and_exit(status); |
92 | } |
93 |