NetBSD/usr.bin/split/split.c

313 lines
7.5 KiB
C

/* $NetBSD: split.c,v 1.9 2003/03/20 14:12:50 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1987, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n");
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)split.c 8.3 (Berkeley) 4/25/94";
#endif
__RCSID("$NetBSD: split.c,v 1.9 2003/03/20 14:12:50 christos Exp $");
#endif /* not lint */
#include <sys/param.h>
#include <ctype.h>
#include <err.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define DEFLINE 1000 /* Default num lines per file. */
static int file_open; /* If a file open. */
static int ifd = -1, ofd = -1; /* Input/output file descriptors. */
static char fname[MAXPATHLEN]; /* File name prefix. */
int main(int, char **);
static void newfile(void);
static void split1(unsigned long long);
static void split2(unsigned long long);
static void usage(void) __attribute__((__noreturn__));
static unsigned long long bigwrite __P((int, const void *, unsigned long long));
int
main(int argc, char *argv[])
{
int ch;
char *ep, *p;
unsigned long long bytecnt = 0; /* Byte count to split on. */
unsigned long long numlines = 0;/* Line count to split on. */
while ((ch = getopt(argc, argv, "-0123456789b:l:")) != -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])
numlines = strtol(++p, &ep, 10);
else
numlines =
strtol(argv[optind] + 1, &ep, 10);
if (numlines <= 0 || *ep)
errx(1,
"%s: illegal line count.", optarg);
}
break;
case '-': /* Undocumented: historic stdin flag. */
if (ifd != -1)
usage();
ifd = 0;
break;
case 'b': /* Byte count. */
if ((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 ((numlines = strtoull(optarg, &ep, 10)) <= 0 || *ep)
errx(1, "%s: illegal line count.", optarg);
break;
default:
usage();
}
argv += optind;
argc -= optind;
if (*argv != NULL)
if (ifd == -1) { /* Input file. */
if ((ifd = open(*argv, O_RDONLY, 0)) < 0)
err(1, "%s", *argv);
++argv;
}
if (*argv != NULL) /* File name prefix. */
(void)strcpy(fname, *argv++);
if (*argv != NULL)
usage();
if (numlines == 0)
numlines = DEFLINE;
else if (bytecnt)
usage();
if (ifd == -1) /* Stdin by default. */
ifd = 0;
if (bytecnt) {
split1(bytecnt);
} else {
split2(numlines);
}
return 0;
}
/*
* split1 --
* Split the input by bytes.
*/
static void
split1(unsigned long long bytecnt)
{
unsigned long long bcnt, dist;
ssize_t len;
char *C;
char bfr[MAXBSIZE];
for (bcnt = 0;;)
switch (len = read(ifd, bfr, MAXBSIZE)) {
case 0:
exit(0);
case -1:
err(1, "read");
/* NOTREACHED */
default:
if (!file_open) {
newfile();
file_open = 1;
}
if (bcnt + len >= bytecnt) {
dist = bytecnt - bcnt;
if (bigwrite(ofd, bfr, dist) != dist)
err(1, "write");
len -= dist;
for (C = bfr + dist; len >= bytecnt;
len -= bytecnt, C += bytecnt) {
newfile();
if (bigwrite(ofd,
C, (int)bytecnt) != bytecnt)
err(1, "write");
}
if (len) {
newfile();
if (bigwrite(ofd, C, len) != len)
err(1, "write");
} else
file_open = 0;
bcnt = len;
} else {
bcnt += len;
if (bigwrite(ofd, bfr, len) != len)
err(1, "write");
}
}
}
/*
* split2 --
* Split the input by lines.
*/
static void
split2(unsigned long long numlines)
{
unsigned long long lcnt, bcnt;
ssize_t len;
char *Ce, *Cs;
char bfr[MAXBSIZE];
for (lcnt = 0;;)
switch (len = read(ifd, bfr, MAXBSIZE)) {
case 0:
exit(0);
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) != 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) != bcnt)
err(1, "write");
}
}
}
/*
* newfile --
* Open a new output file.
*/
static void
newfile(void)
{
static int fnum;
static int defname;
static char *fpnt;
if (ofd == -1) {
if (fname[0] == '\0') {
fname[0] = 'x';
fpnt = fname + 1;
defname = 1;
} else {
fpnt = fname + strlen(fname);
defname = 0;
}
ofd = fileno(stdout);
}
/*
* Hack to increase max files; original code wandered through
* magic characters. Maximum files is 3 * 26 * 26 == 2028
*/
#define MAXFILES 676
if (fnum == MAXFILES) {
if (!defname || fname[0] == 'z')
errx(1, "too many files.");
++fname[0];
fnum = 0;
}
fpnt[0] = fnum / 26 + 'a';
fpnt[1] = fnum % 26 + 'a';
++fnum;
if (!freopen(fname, "w", stdout))
err(1, "%s", fname);
}
static unsigned long long
bigwrite(int fd, const void *buf, unsigned long long len)
{
const char *ptr = buf;
unsigned long long sofar = 0;
while (len != 0) {
ssize_t w, nw = (len > INT_MAX) ? INT_MAX : (ssize_t)len;
if ((w = write(fd, ptr, nw)) == -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] [file [prefix]]\n", getprogname());
exit(1);
}