sbase

suckless unix tools
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commit 0ed2a550037fdd96af7756639cf3210a20deb852
parent cd592c9f23ba822f506775c3bbd8d2185a089161
Author: sin <sin@2f30.org>
Date:   Wed Aug 14 10:41:55 +0100

Add strings(1)

Diffstat:
Makefile | 1+
strings.1 | 10++++++++++
strings.c | 56++++++++++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 67 insertions(+), 0 deletions(-)
diff --git a/Makefile b/Makefile @@ -70,6 +70,7 @@ SRC = \ sort.c \ split.c \ sponge.c \ + strings.c \ sync.c \ tail.c \ tar.c \ diff --git a/strings.1 b/strings.1 @@ -0,0 +1,10 @@ +.TH STRINGS 1 sbase\-VERSION +.SH NAME +strings \- print the strings of printable characters in files +.SH SYNOPSIS +.B strings +.IR [file...] +.SH DESCRIPTION +.B strings +prints the printable character sequences that are at least 6 characters +long. If no files are given then it uses stdin. diff --git a/strings.c b/strings.c @@ -0,0 +1,56 @@ +/* See LICENSE file for copyright and license details. */ +#include <stdio.h> +#include <stdlib.h> +#include <ctype.h> +#include "util.h" + +static void dostrings(FILE *fp, const char *fname); + +static void +usage(void) +{ + eprintf("usage: %s file\n", argv0); +} + +int +main(int argc, char *argv[]) +{ + FILE *fp; + + ARGBEGIN { + default: + usage(); + } ARGEND; + + if (argc > 0) { + if (!(fp = fopen(argv[0], "r"))) + eprintf("open %s:", argv[0]); + dostrings(fp, argv[0]); + fclose(fp); + } else { + dostrings(stdin, "<stdin>"); + } + + return 0; +} + +static void +dostrings(FILE *fp, const char *fname) +{ + unsigned char buf[BUFSIZ]; + int c, i = 0; + off_t offset = 0; + + do { + offset++; + if (isprint(c = getc(fp))) + buf[i++] = c; + if ((!isprint(c) && i >= 6) || i == sizeof(buf) - 1) { + buf[i] = '\0'; + printf("%8ld: %s\n", (long)offset - i - 1, buf); + i = 0; + } + } while (c != EOF); + if (ferror(fp)) + eprintf("%s: read error:", fname); +}