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-rw-r--r--usr.bin/split/split.c362
1 files changed, 362 insertions, 0 deletions
diff --git a/usr.bin/split/split.c b/usr.bin/split/split.c
new file mode 100644
index 0000000..e538da1
--- /dev/null
+++ b/usr.bin/split/split.c
@@ -0,0 +1,362 @@
+/* $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/cdefs.h>
+#ifndef lint
+__COPYRIGHT("@(#) Copyright (c) 1987, 1993, 1994\
+ The Regents of the University of California. All rights reserved.");
+#endif /* not lint */
+
+#ifndef lint
+#if 0
+static char sccsid[] = "@(#)split.c 8.3 (Berkeley) 4/25/94";
+#endif
+__RCSID("$NetBSD: split.c,v 1.27 2017/01/10 21:14:13 christos Exp $");
+#endif /* not lint */
+
+#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 <string.h>
+#include <unistd.h>
+
+#define DEFLINE 1000 /* Default num lines per file. */
+
+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) __dead;
+static void split2(off_t) __dead;
+static void split3(off_t) __dead;
+static void usage(void) __dead;
+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);
+}
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