blob: edd0e667d4dec02c0ab5ff6e07ed23455f4cd56f
| 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 | //config:config STRINGS |
| 10 | //config: bool "strings" |
| 11 | //config: default y |
| 12 | //config: help |
| 13 | //config: strings prints the printable character sequences for each file |
| 14 | //config: specified. |
| 15 | |
| 16 | //applet:IF_STRINGS(APPLET(strings, BB_DIR_USR_BIN, BB_SUID_DROP)) |
| 17 | |
| 18 | //kbuild:lib-$(CONFIG_STRINGS) += strings.o |
| 19 | |
| 20 | //usage:#define strings_trivial_usage |
| 21 | //usage: "[-fo] [-t o/d/x] [-n LEN] [FILE]..." |
| 22 | //usage:#define strings_full_usage "\n\n" |
| 23 | //usage: "Display printable strings in a binary file\n" |
| 24 | //We usually don't bother user with "nop" options. They work, but are not shown: |
| 25 | ////usage: "\n -a Scan whole file (default)" |
| 26 | //unimplemented alternative is -d: Only strings from initialized, loaded data sections |
| 27 | //usage: "\n -f Precede strings with filenames" |
| 28 | //usage: "\n -o Precede strings with octal offsets" |
| 29 | //usage: "\n -t o/d/x Precede strings with offsets in base 8/10/16" |
| 30 | //usage: "\n -n LEN At least LEN characters form a string (default 4)" |
| 31 | |
| 32 | #include "libbb.h" |
| 33 | |
| 34 | #define WHOLE_FILE 1 |
| 35 | #define PRINT_NAME 2 |
| 36 | #define PRINT_OFFSET 4 |
| 37 | #define SIZE 8 |
| 38 | #define PRINT_RADIX 16 |
| 39 | |
| 40 | int strings_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 41 | int strings_main(int argc UNUSED_PARAM, char **argv) |
| 42 | { |
| 43 | int c, status = EXIT_SUCCESS; |
| 44 | unsigned n, count; |
| 45 | off_t offset; |
| 46 | FILE *file; |
| 47 | char *string; |
| 48 | const char *fmt = "%s: "; |
| 49 | const char *n_arg = "4"; |
| 50 | /* default for -o */ |
| 51 | const char *radix = "o"; |
| 52 | char *radix_fmt; |
| 53 | |
| 54 | getopt32(argv, "afon:t:", &n_arg, &radix); |
| 55 | /* -a is our default behaviour */ |
| 56 | /*argc -= optind;*/ |
| 57 | argv += optind; |
| 58 | |
| 59 | n = xatou_range(n_arg, 1, INT_MAX); |
| 60 | string = xzalloc(n + 1); |
| 61 | n--; |
| 62 | |
| 63 | if ((radix[0] != 'd' && radix[0] != 'o' && radix[0] != 'x') || radix[1] != 0) |
| 64 | bb_show_usage(); |
| 65 | |
| 66 | radix_fmt = xasprintf("%%7"OFF_FMT"%s ", radix); |
| 67 | |
| 68 | if (!*argv) { |
| 69 | fmt = "{%s}: "; |
| 70 | *--argv = (char *)bb_msg_standard_input; |
| 71 | } |
| 72 | |
| 73 | do { |
| 74 | file = fopen_or_warn_stdin(*argv); |
| 75 | if (!file) { |
| 76 | status = EXIT_FAILURE; |
| 77 | continue; |
| 78 | } |
| 79 | offset = 0; |
| 80 | count = 0; |
| 81 | do { |
| 82 | c = fgetc(file); |
| 83 | if (isprint_asciionly(c) || c == '\t') { |
| 84 | if (count > n) { |
| 85 | bb_putchar(c); |
| 86 | } else { |
| 87 | string[count] = c; |
| 88 | if (count == n) { |
| 89 | if (option_mask32 & PRINT_NAME) { |
| 90 | printf(fmt, *argv); |
| 91 | } |
| 92 | if (option_mask32 & (PRINT_OFFSET | PRINT_RADIX)) { |
| 93 | printf(radix_fmt, offset - n); |
| 94 | } |
| 95 | fputs(string, stdout); |
| 96 | } |
| 97 | count++; |
| 98 | } |
| 99 | } else { |
| 100 | if (count > n) { |
| 101 | bb_putchar('\n'); |
| 102 | } |
| 103 | count = 0; |
| 104 | } |
| 105 | offset++; |
| 106 | } while (c != EOF); |
| 107 | fclose_if_not_stdin(file); |
| 108 | } while (*++argv); |
| 109 | |
| 110 | if (ENABLE_FEATURE_CLEAN_UP) { |
| 111 | free(string); |
| 112 | free(radix_fmt); |
| 113 | } |
| 114 | |
| 115 | fflush_stdout_and_exit(status); |
| 116 | } |
| 117 |