Add a new command-line option "-n chunk_count", that splits the input
file into chunk_count smaller files. Each file will be size/chunk_count bytes large, with whatever spillover there is ending up in the chunk_counth file.
This commit is contained in:
jschauma
parent
7243a4e86c
commit
e1925bdef9
@ -1,4 +1,4 @@
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.\" $NetBSD: split.1,v 1.14 2006/12/24 08:35:21 wiz Exp $
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.\" $NetBSD: split.1,v 1.15 2007/05/31 01:35:35 jschauma Exp $
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.\"
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.\" Copyright (c) 1990, 1991, 1993, 1994
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.\" The Regents of the University of California. All rights reserved.
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@ -29,7 +29,7 @@
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.\"
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.\" @(#)split.1 8.3 (Berkeley) 4/16/94
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.\"
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.Dd July 10, 2003
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.Dd May 28, 2007
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.Dt SPLIT 1
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.Os
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.Sh NAME
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@ -41,6 +41,7 @@
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.Oo
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.Fl b Ar byte_count Ns Oo Li k|m Oc |
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.Fl l Ar line_count
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.Fl n Ar chunk_count
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.Oc
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.Op Ar file Op Ar name
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.Sh DESCRIPTION
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@ -81,6 +82,10 @@ megabyte pieces.
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Create smaller files
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.Ar line_count
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lines in length.
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.It Fl n
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Split file into
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.Ar chunk_count
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smaller files.
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.El
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.Pp
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If additional arguments are specified, the first is used as the name
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@ -1,4 +1,4 @@
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/* $NetBSD: split.c,v 1.21 2004/01/05 23:23:37 jmmv Exp $ */
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/* $NetBSD: split.c,v 1.22 2007/05/31 01:35:35 jschauma Exp $ */
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/*
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* Copyright (c) 1987, 1993, 1994
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@ -39,7 +39,7 @@ __COPYRIGHT("@(#) Copyright (c) 1987, 1993, 1994\n\
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#if 0
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static char sccsid[] = "@(#)split.c 8.3 (Berkeley) 4/25/94";
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#endif
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__RCSID("$NetBSD: split.c,v 1.21 2004/01/05 23:23:37 jmmv Exp $");
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__RCSID("$NetBSD: split.c,v 1.22 2007/05/31 01:35:35 jschauma Exp $");
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#endif /* not lint */
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#include <sys/param.h>
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@ -62,8 +62,9 @@ static size_t sfxlen = 2; /* suffix length. */
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int main(int, char **);
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static void newfile(void);
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static void split1(off_t);
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static void split1(off_t, int);
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static void split2(off_t);
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static void split3(off_t);
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static void usage(void) __attribute__((__noreturn__));
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static size_t bigwrite(int, void const *, size_t);
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@ -75,8 +76,9 @@ main(int argc, char *argv[])
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char const *base;
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off_t bytecnt = 0; /* Byte count to split on. */
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off_t numlines = 0; /* Line count to split on. */
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off_t chunks = 0; /* Number of chunks to split into. */
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while ((ch = getopt(argc, argv, "0123456789b:l:a:")) != -1)
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while ((ch = getopt(argc, argv, "0123456789b:l:a:n:")) != -1)
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switch (ch) {
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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@ -119,6 +121,12 @@ main(int argc, char *argv[])
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*ep != '\0')
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errx(1, "%s: illegal suffix length.", optarg);
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break;
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case 'n': /* Chunks. */
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if (!isdigit((unsigned char)optarg[0]) ||
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(chunks = (size_t)strtoul(optarg, &ep, 10)) == 0 ||
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*ep != '\0')
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errx(1, "%s: illegal number of chunks.", optarg);
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break;
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default:
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usage();
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}
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@ -143,12 +151,17 @@ main(int argc, char *argv[])
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if (numlines == 0)
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numlines = DEFLINE;
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else if (bytecnt)
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else if (bytecnt || chunks)
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usage();
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if (bytecnt && chunks)
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usage();
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if (bytecnt)
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split1(bytecnt);
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else
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split1(bytecnt, 0);
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else if (chunks)
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split3(chunks);
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else
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split2(numlines);
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return 0;
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@ -159,12 +172,15 @@ main(int argc, char *argv[])
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* Split the input by bytes.
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*/
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static void
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split1(off_t bytecnt)
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split1(off_t bytecnt, int maxcnt)
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{
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off_t bcnt;
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ssize_t dist, len;
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char *C;
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char bfr[MAXBSIZE];
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int nfiles;
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nfiles = 0;
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for (bcnt = 0;;)
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switch (len = read(ifd, bfr, MAXBSIZE)) {
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@ -176,8 +192,11 @@ split1(off_t bytecnt)
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/* NOTREACHED */
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default:
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if (!file_open) {
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newfile();
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file_open = 1;
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if (!maxcnt || (nfiles < maxcnt)) {
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newfile();
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nfiles++;
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file_open = 1;
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}
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}
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if (bcnt + len >= bytecnt) {
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/* LINTED: bytecnt - bcnt <= len */
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@ -188,14 +207,20 @@ split1(off_t bytecnt)
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for (C = bfr + dist; len >= bytecnt;
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/* LINTED: bytecnt <= len */
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len -= bytecnt, C += bytecnt) {
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newfile();
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if (!maxcnt || (nfiles < maxcnt)) {
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newfile();
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nfiles++;
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}
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/* LINTED: as above */
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if (bigwrite(ofd,
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C, bytecnt) != bytecnt)
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err(1, "write");
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}
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if (len) {
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newfile();
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if (!maxcnt || (nfiles < maxcnt)) {
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newfile();
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nfiles++;
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}
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/* LINTED: len >= 0 */
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if (bigwrite(ofd, C, len) != len)
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err(1, "write");
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@ -257,6 +282,29 @@ split2(off_t numlines)
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}
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}
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/*
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* split3 --
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* Split the input into specified number of chunks
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*/
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static void
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split3(off_t chunks)
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{
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struct stat sb;
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if (fstat(ifd, &sb) == -1) {
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err(1, "stat");
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/* NOTREACHED */
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}
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if (chunks > sb.st_size) {
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errx(1, "can't split into more than %d files",
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(int)sb.st_size);
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/* NOTREACHED */
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}
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split1(sb.st_size/chunks, chunks);
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}
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/*
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* newfile --
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* Open a new output file.
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@ -308,7 +356,7 @@ static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: %s [-b byte_count] [-l line_count] [-a suffix_length] "
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"usage: %s [-b byte_count] [-l line_count] [-n chunk_count] [-a suffix_length] "
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"[file [prefix]]\n", getprogname());
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exit(1);
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}
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