git.maemo.org Git - busybox4maemo/blob - 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 <getopt.h>
  11
  12 #include "libbb.h"
  13
  14 #define WHOLE_FILE              1
  15 #define PRINT_NAME              2
  16 #define PRINT_OFFSET    4
  17 #define SIZE                    8
  18
  19 int strings_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  20 int strings_main(int argc ATTRIBUTE_UNUSED, char **argv)
  21 {
  22         int n, c, status = EXIT_SUCCESS;
  23         unsigned opt;
  24         unsigned count;
  25         off_t offset;
  26         FILE *file;
  27         char *string;
  28         const char *fmt = "%s: ";
  29         const char *n_arg = "4";
  30
  31         opt = getopt32(argv, "afon:", &n_arg);
  32         /* -a is our default behaviour */
  33         /*argc -= optind;*/
  34         argv += optind;
  35
  36         n = xatou_range(n_arg, 1, INT_MAX);
  37         string = xzalloc(n + 1);
  38         n--;
  39
  40         if (!*argv) {
  41                 fmt = "{%s}: ";
  42                 *--argv = (char *)bb_msg_standard_input;
  43         }
  44
  45         do {
  46                 file = fopen_or_warn_stdin(*argv);
  47                 if (!file) {
  48                         status = EXIT_FAILURE;
  49                         continue;
  50                 }
  51                 offset = 0;
  52                 count = 0;
  53                 do {
  54                         c = fgetc(file);
  55                         if (isprint(c) || c == '\t') {
  56                                 if (count > n) {
  57                                         bb_putchar(c);
  58                                 } else {
  59                                         string[count] = c;
  60                                         if (count == n) {
  61                                                 if (opt & PRINT_NAME) {
  62                                                         printf(fmt, *argv);
  63                                                 }
  64                                                 if (opt & PRINT_OFFSET) {
  65                                                         printf("%7"OFF_FMT"o ", offset - n);
  66                                                 }
  67                                                 fputs(string, stdout);
  68                                         }
  69                                         count++;
  70                                 }
  71                         } else {
  72                                 if (count > n) {
  73                                         bb_putchar('\n');
  74                                 }
  75                                 count = 0;
  76                         }
  77                         offset++;
  78                 } while (c != EOF);
  79                 fclose_if_not_stdin(file);
  80         } while (*++argv);
  81
  82         if (ENABLE_FEATURE_CLEAN_UP)
  83                 free(string);
  84
  85         fflush_stdout_and_exit(status);
  86 }