sbase

suckless unix tools
git clone git://git.2f30.org/sbase.git
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commit 43b8fa1a5820506dbf4cd49146b6f57a6de6e701
parent b55de3d1a257d5e0232e081e402532ef68fcedaf
Author: FRIGN <dev@frign.de>
Date:   Sat Jan 17 23:38:38 +0100

Add mandoc-manpage for cksum(1) and clean up code

and mark it as done in README.

Diffstat:
README | 2+-
cksum.1 | 36+++++++++++++++++++++++++++---------
cksum.c | 64+++++++++++++++++++++++++++++++---------------------------------
3 files changed, 59 insertions(+), 43 deletions(-)
diff --git a/README b/README @@ -15,7 +15,7 @@ The following tools are implemented (* == finished): * chmod yes none chown no -h, -H, -L, -P chroot non-posix none - cksum yes none +* cksum yes none * cmp yes none * cols non-posix none comm yes none diff --git a/cksum.1 b/cksum.1 @@ -1,9 +1,27 @@ -.TH CKSUM 1 sbase\-VERSION -.SH NAME -cksum \- print file checksums -.SH SYNOPSIS -.B cksum -.RI [ file ...] -.SH DESCRIPTION -.B cksum -calculates and prints a cyclic redundancy check (CRC) for each input file. +.Dd January 17, 2014 +.Dt CKSUM 1 sbase\-VERSION +.Sh NAME +.Nm cksum +.Nd compute file checksum +.Sh SYNOPSIS +.Nm cksum +.Op Ar file ... +.Sh DESCRIPTION +.Nm +calculates a cyclic redundancy check (CRC) of +.Ar file +according to +.St -iso8802-3 +and writes it, the file size in bytes and path to stdout. +.Pp +If no +.Ar file +is given, +.Nm +reads from stdin. +.Sh STANDARDS +The +.Nm +utility is compliant with the +.St -p1003.1-2008 +specification. diff --git a/cksum.c b/cksum.c @@ -7,14 +7,6 @@ #include "util.h" -static void cksum(FILE *, const char *); - -static void -usage(void) -{ - eprintf("usage: %s [files...]\n", argv0); -} - static const unsigned long crctab[] = { 0x00000000, 0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b, 0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6, @@ -69,31 +61,6 @@ static const unsigned long crctab[] = { 0x00000000, 0xa2f33668, 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4 }; -int -main(int argc, char *argv[]) -{ - FILE *fp; - - ARGBEGIN { - default: - usage(); - } ARGEND; - - if (argc == 0) { - cksum(stdin, NULL); - } else { - for (; argc > 0; argc--, argv++) { - if (!(fp = fopen(argv[0], "r"))) { - weprintf("fopen %s:", argv[0]); - continue; - } - cksum(fp, argv[0]); - fclose(fp); - } - } - return 0; -} - static void cksum(FILE *fp, const char *s) { @@ -118,3 +85,34 @@ cksum(FILE *fp, const char *s) printf(" %s", s); putchar('\n'); } + +static void +usage(void) +{ + eprintf("usage: %s [files ...]\n", argv0); +} + +int +main(int argc, char *argv[]) +{ + FILE *fp; + + ARGBEGIN { + default: + usage(); + } ARGEND; + + if (argc == 0) + cksum(stdin, NULL); + else { + for (; argc > 0; argc--, argv++) { + if (!(fp = fopen(argv[0], "r"))) { + weprintf("fopen %s:", argv[0]); + continue; + } + cksum(fp, argv[0]); + fclose(fp); + } + } + return 0; +}