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/* vi: set sw=4 ts=4: */
/*
* strings implementation for busybox
*
* Copyright 2003 Tito Ragusa <farmatito@tiscali.it>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
//config:config STRINGS
//config: bool "strings"
//config: default y
//config: help
//config: strings prints the printable character sequences for each file
//config: specified.
//applet:IF_STRINGS(APPLET(strings, BB_DIR_USR_BIN, BB_SUID_DROP))
//kbuild:lib-$(CONFIG_STRINGS) += strings.o
//usage:#define strings_trivial_usage
//usage: "[-fo] [-t o/d/x] [-n LEN] [FILE]..."
//usage:#define strings_full_usage "\n\n"
//usage: "Display printable strings in a binary file\n"
//We usually don't bother user with "nop" options. They work, but are not shown:
////usage: "\n -a Scan whole file (default)"
//unimplemented alternative is -d: Only strings from initialized, loaded data sections
//usage: "\n -f Precede strings with filenames"
//usage: "\n -o Precede strings with octal offsets"
//usage: "\n -t o/d/x Precede strings with offsets in base 8/10/16"
//usage: "\n -n LEN At least LEN characters form a string (default 4)"
#include "libbb.h"
#define WHOLE_FILE 1
#define PRINT_NAME 2
#define PRINT_OFFSET 4
#define SIZE 8
#define PRINT_RADIX 16
int strings_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int strings_main(int argc UNUSED_PARAM, char **argv)
{
int n, c, status = EXIT_SUCCESS;
unsigned count;
off_t offset;
FILE *file;
char *string;
const char *fmt = "%s: ";
const char *n_arg = "4";
/* default for -o */
const char *radix = "o";
char *radix_fmt;
getopt32(argv, "afon:t:", &n_arg, &radix);
/* -a is our default behaviour */
/*argc -= optind;*/
argv += optind;
n = xatou_range(n_arg, 1, INT_MAX);
string = xzalloc(n + 1);
n--;
if ((radix[0] != 'd' && radix[0] != 'o' && radix[0] != 'x') || radix[1] != 0)
bb_show_usage();
radix_fmt = xasprintf("%%7"OFF_FMT"%s ", radix);
if (!*argv) {
fmt = "{%s}: ";
*--argv = (char *)bb_msg_standard_input;
}
do {
file = fopen_or_warn_stdin(*argv);
if (!file) {
status = EXIT_FAILURE;
continue;
}
offset = 0;
count = 0;
do {
c = fgetc(file);
if (isprint_asciionly(c) || c == '\t') {
if (count > n) {
bb_putchar(c);
} else {
string[count] = c;
if (count == n) {
if (option_mask32 & PRINT_NAME) {
printf(fmt, *argv);
}
if (option_mask32 & (PRINT_OFFSET | PRINT_RADIX)) {
printf(radix_fmt, offset - n);
}
fputs(string, stdout);
}
count++;
}
} else {
if (count > n) {
bb_putchar('\n');
}
count = 0;
}
offset++;
} while (c != EOF);
fclose_if_not_stdin(file);
} while (*++argv);
if (ENABLE_FEATURE_CLEAN_UP) {
free(string);
free(radix_fmt);
}
fflush_stdout_and_exit(status);
}
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