LXR busybox/miscutils/strings.c

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