/* $NetBSD: split.c,v 1.27 2017/01/10 21:14:13 christos Exp $ */
/*
* Copyright (c) 1987, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/param.h>
#include <sys/stat.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <bsd/stdlib.h>
#include <string.h>
#include <unistd.h>
#define DEFLINE 1000 /* Default num lines per file. */
#define MAXBSIZE (64*1024)
#define DEFFILEMODE (S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH)
static int file_open; /* If a file open. */
static int ifd = STDIN_FILENO, ofd = -1; /* Input/output file descriptors. */
static char *fname; /* File name prefix. */
static size_t sfxlen = 2; /* suffix length. */
static void newfile(void);
static void split1(off_t, int);
static void split2(off_t);
static void split3(off_t);
static void usage(void);
static size_t bigwrite(int, void const *, size_t);
int
main(int argc, char *argv[])
{
int ch;
char *ep, *p;
char const *base;
off_t bytecnt = 0; /* Byte count to split on. */
off_t numlines = 0; /* Line count to split on. */
off_t chunks = 0; /* Number of chunks to split into. */
while ((ch = getopt(argc, argv, "0123456789b:l:a:n:")) != -1)
switch (ch) {
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
/*
* Undocumented kludge: split was originally designed
* to take a number after a dash.
*/
if (numlines == 0) {
p = argv[optind - 1];
if (p[0] == '-' && p[1] == ch && !p[2])
p++;
else
p = argv[optind] + 1;
numlines = strtoull(p, &ep, 10);
if (numlines == 0 || *ep != '\0')
errx(1, "%s: illegal line count.", p);
}
break;
case 'b': /* Byte count. */
if (!isdigit((unsigned char)optarg[0]) ||
(bytecnt = strtoull(optarg, &ep, 10)) == 0 ||
(*ep != '\0' && *ep != 'k' && *ep != 'm'))
errx(1, "%s: illegal byte count.", optarg);
if (*ep == 'k')
bytecnt *= 1024;
else if (*ep == 'm')
bytecnt *= 1024 * 1024;
break;
case 'l': /* Line count. */
if (numlines != 0)
usage();
if (!isdigit((unsigned char)optarg[0]) ||
(numlines = strtoull(optarg, &ep, 10)) == 0 ||
*ep != '\0')
errx(1, "%s: illegal line count.", optarg);
break;
case 'a': /* Suffix length. */
if (!isdigit((unsigned char)optarg[0]) ||
(sfxlen = (size_t)strtoul(optarg, &ep, 10)) == 0 ||
*ep != '\0')
errx(1, "%s: illegal suffix length.", optarg);
break;
case 'n': /* Chunks. */
if (!isdigit((unsigned char)optarg[0]) ||
(chunks = (size_t)strtoul(optarg, &ep, 10)) == 0 ||
*ep != '\0')
errx(1, "%s: illegal number of chunks.", optarg);
break;
default:
usage();
}
argv += optind;
argc -= optind;
if (*argv != NULL) {
if (strcmp(*argv, "-") != 0 &&
(ifd = open(*argv, O_RDONLY, 0)) < 0)
err(1, "%s", *argv);
++argv;
}
base = (*argv != NULL) ? *argv++ : "x";
if ((fname = malloc(strlen(base) + sfxlen + 1)) == NULL)
err(EXIT_FAILURE, NULL);
(void)strcpy(fname, base); /* File name prefix. */
if (*argv != NULL)
usage();
if (numlines == 0)
numlines = DEFLINE;
else if (bytecnt || chunks)
usage();
if (bytecnt && chunks)
usage();
if (bytecnt)
split1(bytecnt, 0);
else if (chunks)
split3(chunks);
else
split2(numlines);
return 0;
}
/*
* split1 --
* Split the input by bytes.
*/
static void
split1(off_t bytecnt, int maxcnt)
{
off_t bcnt;
ssize_t dist, len;
char *C;
char bfr[MAXBSIZE];
int nfiles;
nfiles = 0;
for (bcnt = 0;;)
switch (len = read(ifd, bfr, MAXBSIZE)) {
case 0:
exit(0);
/* NOTREACHED */
case -1:
err(1, "read");
/* NOTREACHED */
default:
if (!file_open) {
if (!maxcnt || (nfiles < maxcnt)) {
newfile();
nfiles++;
file_open = 1;
}
}
if (bcnt + len >= bytecnt) {
/* LINTED: bytecnt - bcnt <= len */
dist = bytecnt - bcnt;
if (bigwrite(ofd, bfr, dist) != (size_t)dist)
err(1, "write");
len -= dist;
for (C = bfr + dist; len >= bytecnt;
/* LINTED: bytecnt <= len */
len -= bytecnt, C += bytecnt) {
if (!maxcnt || (nfiles < maxcnt)) {
newfile();
nfiles++;
}
/* LINTED: as above */
if (bigwrite(ofd,
C, bytecnt) != (size_t)bytecnt)
err(1, "write");
}
if (len) {
if (!maxcnt || (nfiles < maxcnt)) {
newfile();
nfiles++;
}
/* LINTED: len >= 0 */
if (bigwrite(ofd, C, len) != (size_t)len)
err(1, "write");
} else
file_open = 0;
bcnt = len;
} else {
bcnt += len;
/* LINTED: len >= 0 */
if (bigwrite(ofd, bfr, len) != (size_t)len)
err(1, "write");
}
}
}
/*
* split2 --
* Split the input by lines.
*/
static void
split2(off_t numlines)
{
off_t lcnt;
size_t bcnt;
ssize_t len;
char *Ce, *Cs;
char bfr[MAXBSIZE];
for (lcnt = 0;;)
switch (len = read(ifd, bfr, MAXBSIZE)) {
case 0:
exit(0);
/* NOTREACHED */
case -1:
err(1, "read");
/* NOTREACHED */
default:
if (!file_open) {
newfile();
file_open = 1;
}
for (Cs = Ce = bfr; len--; Ce++)
if (*Ce == '\n' && ++lcnt == numlines) {
bcnt = Ce - Cs + 1;
if (bigwrite(ofd, Cs, bcnt) != (size_t)bcnt)
err(1, "write");
lcnt = 0;
Cs = Ce + 1;
if (len)
newfile();
else
file_open = 0;
}
if (Cs < Ce) {
bcnt = Ce - Cs;
if (bigwrite(ofd, Cs, bcnt) != (size_t)bcnt)
err(1, "write");
}
}
}
/*
* split3 --
* Split the input into specified number of chunks
*/
static void
split3(off_t chunks)
{
struct stat sb;
if (fstat(ifd, &sb) == -1) {
err(1, "stat");
/* NOTREACHED */
}
if (chunks > sb.st_size) {
errx(1, "can't split into more than %d files",
(int)sb.st_size);
/* NOTREACHED */
}
split1(sb.st_size/chunks, chunks);
}
/*
* newfile --
* Open a new output file.
*/
static void
newfile(void)
{
static int fnum;
static char *fpnt;
int quot, i;
if (ofd == -1) {
fpnt = fname + strlen(fname);
fpnt[sfxlen] = '\0';
} else if (close(ofd) != 0)
err(1, "%s", fname);
quot = fnum;
for (i = sfxlen - 1; i >= 0; i--) {
fpnt[i] = quot % 26 + 'a';
quot = quot / 26;
}
if (quot > 0)
errx(1, "too many files.");
++fnum;
if ((ofd = open(fname, O_WRONLY | O_CREAT | O_TRUNC, DEFFILEMODE)) < 0)
err(1, "%s", fname);
}
static size_t
bigwrite(int fd, const void *buf, size_t len)
{
const char *ptr = buf;
size_t sofar = 0;
ssize_t w;
while (len != 0) {
if ((w = write(fd, ptr, len)) == -1)
return sofar;
len -= w;
ptr += w;
sofar += w;
}
return sofar;
}
static void
usage(void)
{
(void)fprintf(stderr,
"usage: %s [-b byte_count] [-l line_count] [-n chunk_count] [-a suffix_length] "
"[file [prefix]]\n", getprogname());
exit(1);
}
