LXR busybox/miscutils/strings.c

   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
  26int strings_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  27int strings_main(int argc UNUSED_PARAM, char **argv)
  28{
  29        int n, c, status = EXIT_SUCCESS;
  30        unsigned 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