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strings: Add -n len support

This commit is contained in:
sin 2015-02-17 13:46:48 +00:00
parent 8ce6d7091a
commit d8a89002d3
3 changed files with 48 additions and 40 deletions
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2
README
View File

@ -67,7 +67,7 @@ The following tools are implemented ('*' == finished, '#' == UTF-8 support,
sort no -m, -o, -d, -f, -i
=* split yes none
=* sponge non-posix none
strings no -n, -t
strings no -t
=* sync non-posix none
=* tail yes none
=* tar non-posix none

5
strings.1
View File

@ -7,6 +7,7 @@
.Sh SYNOPSIS
.Nm
.Op Fl a
.Op Fl n Ar len
.Op Ar file ...
.Sh DESCRIPTION
.Nm
@ -20,6 +21,10 @@ reads from stdin.
.Bl -tag -width Ds
.It Fl a
Scan files in their entirety. This is the default.
.It Fl n Ar len
Only print sequences that are at least
.Ar len
characters. The default is 4 characters.
.El
.Sh STANDARDS
.Nm

81
strings.c
View File

@ -1,48 +1,12 @@
/* See LICENSE file for copyright and license details. */
#include <ctype.h>
#include <stdio.h>
#include <stdlib.h>
#include "util.h"
static void dostrings(FILE *fp, const char *fname);
static void
usage(void)
{
eprintf("usage: %s [-a] [file ...]\n", argv0);
}
int
main(int argc, char *argv[])
{
FILE *fp;
int ret = 0;
ARGBEGIN {
case 'a':
break;
default:
usage();
} ARGEND;
if (argc == 0) {
dostrings(stdin, "<stdin>");
} else {
for (; argc > 0; argc--, argv++) {
if (!(fp = fopen(argv[0], "r"))) {
weprintf("fopen %s:", argv[0]);
ret = 1;
continue;
}
dostrings(fp, argv[0]);
fclose(fp);
}
}
return ret;
}
static void
dostrings(FILE *fp, const char *fname)
strings(FILE *fp, const char *fname, int len)
{
unsigned char buf[BUFSIZ];
int c, i = 0;
@ -52,7 +16,7 @@ dostrings(FILE *fp, const char *fname)
offset++;
if (isprint(c = getc(fp)))
buf[i++] = c;
if ((!isprint(c) && i >= 6) || i == sizeof(buf) - 1) {
if ((!isprint(c) && i >= len) || i == sizeof(buf) - 1) {
buf[i] = '\0';
printf("%8ld: %s\n", (long)offset - i - 1, buf);
i = 0;
@ -61,3 +25,42 @@ dostrings(FILE *fp, const char *fname)
if (ferror(fp))
eprintf("%s: read error:", fname);
}
static void
usage(void)
{
eprintf("usage: %s [-a] [-n len] [file ...]\n", argv0);
}
int
main(int argc, char *argv[])
{
FILE *fp;
int ret = 0;
int len = 4;
ARGBEGIN {
case 'a':
break;
case 'n':
len = estrtonum(EARGF(usage()), 1, INT_MAX);
break;
default:
usage();
} ARGEND;
if (argc == 0) {
strings(stdin, "<stdin>", len);
} else {
for (; argc > 0; argc--, argv++) {
if (!(fp = fopen(argv[0], "r"))) {
weprintf("fopen %s:", argv[0]);
ret = 1;
continue;
}
strings(fp, argv[0], len);
fclose(fp);
}
}
return ret;
}