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/*
* UNG's Not GNU
*
* Copyright (c) 2011, Jakob Kaivo <jakob@kaivo.net>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <getopt.h>
const char *strings_desc = "find printable strings in files";
const char *strings_inv = "strings [-a] [-t format] -[n number] [file...]";
static int strings(FILE * f, int number, char format)
{
char buf[BUFSIZ];
char tbuf[BUFSIZ];
int nread;
int offset = 0;
int i;
int count = 0;
while (!feof(f)) {
nread = fread(buf, sizeof(char), BUFSIZ, f);
for (i = 0; i < nread; i++) {
if (buf[i] == '\0' || buf[i] == '\n') {
if (count >= number) {
switch (format) {
case 'd':
printf("%d ", offset - count);
break;
case 'o':
printf("%o ", offset - count);
break;
case 'x':
printf("%x ", offset - count);
break;
default:
break;
}
fwrite(tbuf, sizeof(char), count,
stdout);
putchar('\n');
}
count = 0;
} else if (isprint(buf[i])) {
tbuf[count] = buf[i];
count++;
} else {
count = 0;
}
offset++;
}
}
return 0;
}
int main(int argc, char **argv)
{
int c;
int number = 4;
char format = 0;
char *end;
while ((c = getopt(argc, argv, ":an:t:")) != -1) {
switch (c) {
case 'a':
// Always scan the entire file
break;
case 'n':
number = strtol(optarg, &end, 10);
if (end != NULL && strlen(end) > 0)
return 1;
break;
case 't':
if (strlen(optarg) != 1)
return 1;
format = optarg[0];
break;
default:
return 1;
}
}
if ((format != 0 && format != 'd' && format != 'o' && format != 'x')
|| number < 1)
return 1;
if (optind >= argc) {
strings(stdin, number, format);
}
while (optind < argc) {
FILE *f = fopen(argv[optind], "r");
strings(f, number, format);
fclose(f);
optind++;
}
return 0;
}
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