source: MondoRescue/branches/2.2.5/mindi-busybox/miscutils/strings.c@ 1765

/* vi: set sw=4 ts=4: */
/*
 * strings implementation for busybox
 *
 * Copyright Tito Ragusa <farmatito@tiscali.it>
 *
 * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
 */

#include <getopt.h>

#include "libbb.h"

#define WHOLE_FILE      1
#define PRINT_NAME      2
#define PRINT_OFFSET    4
#define SIZE            8

int strings_main(int argc, char **argv);
int strings_main(int argc, char **argv)
{
    int n, c, status = EXIT_SUCCESS;
    unsigned opt;
    unsigned count;
    off_t offset;
    FILE *file = stdin;
    char *string;
    const char *fmt = "%s: ";
    const char *n_arg = "4";

    opt = getopt32(argv, "afon:", &n_arg);
    /* -a is our default behaviour */
    /*argc -= optind;*/
    argv += optind;

    n = xatou_range(n_arg, 1, INT_MAX);
    string = xzalloc(n + 1);
    n--;

    if (!*argv) {
        fmt = "{%s}: ";
        *--argv = (char *)bb_msg_standard_input;
        goto PIPE;
    }

    do {
        file = fopen_or_warn(*argv, "r");
        if (!file) {
            status = EXIT_FAILURE;
            continue;
        }
 PIPE:
        offset = 0;
        count = 0;
        do {
            c = fgetc(file);
            if (isprint(c) || c == '\t') {
                if (count > n) {
                    putchar(c);
                } else {
                    string[count] = c;
                    if (count == n) {
                        if (opt & PRINT_NAME) {
                            printf(fmt, *argv);
                        }
                        if (opt & PRINT_OFFSET) {
                            printf("%7"OFF_FMT"o ", offset - n);
                        }
                        fputs(string, stdout);
                    }
                    count++;
                }
            } else {
                if (count > n) {
                    putchar('\n');
                }
                count = 0;
            }
            offset++;
        } while (c != EOF);
        fclose_if_not_stdin(file);
    } while (*++argv);

    if (ENABLE_FEATURE_CLEAN_UP)
        free(string);

    fflush_stdout_and_exit(status);
}