354 lines
8.5 KiB
C
354 lines
8.5 KiB
C
/*
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* Copyright (c) 1987, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1987, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif
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#ifndef lint
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static const char sccsid[] = "@(#)split.c 8.2 (Berkeley) 4/16/94";
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#endif
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#include <sys/param.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <limits.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <regex.h>
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#include <sysexits.h>
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#define DEFLINE 1000 /* Default num lines per file. */
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off_t bytecnt; /* Byte count to split on. */
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long numlines; /* Line count to split on. */
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int file_open; /* If a file open. */
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int ifd = -1, ofd = -1; /* Input/output file descriptors. */
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char bfr[MAXBSIZE]; /* I/O buffer. */
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char fname[MAXPATHLEN]; /* File name prefix. */
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regex_t rgx;
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int pflag;
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long sufflen = 2; /* File name suffix length. */
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void newfile(void);
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void split1(void);
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void split2(void);
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static void usage(void);
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int
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main(int argc, char **argv)
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{
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intmax_t bytecnti;
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long scale;
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int ch;
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char *ep, *p;
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while ((ch = getopt(argc, argv, "-0123456789a:b:l:p:")) != -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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/*
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* Undocumented kludge: split was originally designed
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* to take a number after a dash.
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*/
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if (numlines == 0) {
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p = argv[optind - 1];
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if (p[0] == '-' && p[1] == ch && !p[2])
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numlines = strtol(++p, &ep, 10);
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else
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numlines =
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strtol(argv[optind] + 1, &ep, 10);
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if (numlines <= 0 || *ep)
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errx(EX_USAGE,
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"%s: illegal line count", optarg);
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}
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break;
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case '-': /* Undocumented: historic stdin flag. */
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if (ifd != -1)
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usage();
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ifd = 0;
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break;
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case 'a': /* Suffix length */
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if ((sufflen = strtol(optarg, &ep, 10)) <= 0 || *ep)
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errx(EX_USAGE,
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"%s: illegal suffix length", optarg);
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break;
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case 'b': /* Byte count. */
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errno = 0;
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if ((bytecnti = strtoimax(optarg, &ep, 10)) <= 0 ||
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(*ep != '\0' && *ep != 'k' && *ep != 'm') ||
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errno != 0)
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errx(EX_USAGE,
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"%s: illegal byte count", optarg);
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if (*ep == 'k')
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scale = 1024;
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else if (*ep == 'm')
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scale = 1024 * 1024;
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else
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scale = 1;
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if (bytecnti > OFF_MAX / scale)
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errx(EX_USAGE, "%s: offset too large", optarg);
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bytecnt = (off_t)(bytecnti * scale);
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break;
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case 'p' : /* pattern matching. */
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if (regcomp(&rgx, optarg, REG_EXTENDED|REG_NOSUB) != 0)
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errx(EX_USAGE, "%s: illegal regexp", optarg);
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pflag = 1;
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break;
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case 'l': /* Line count. */
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if (numlines != 0)
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usage();
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if ((numlines = strtol(optarg, &ep, 10)) <= 0 || *ep)
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errx(EX_USAGE,
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"%s: illegal line count", optarg);
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break;
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default:
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usage();
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}
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argv += optind;
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argc -= optind;
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if (*argv != NULL)
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if (ifd == -1) { /* Input file. */
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if (strcmp(*argv, "-") == 0)
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ifd = STDIN_FILENO;
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else if ((ifd = open(*argv, O_RDONLY, 0)) < 0)
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err(EX_NOINPUT, "%s", *argv);
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++argv;
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}
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if (*argv != NULL) /* File name prefix. */
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if (strlcpy(fname, *argv++, sizeof(fname)) >= sizeof(fname))
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errx(EX_USAGE, "file name prefix is too long");
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if (*argv != NULL)
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usage();
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if (strlen(fname) + (unsigned long)sufflen >= sizeof(fname))
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errx(EX_USAGE, "suffix is too long");
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if (pflag && (numlines != 0 || bytecnt != 0))
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usage();
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if (numlines == 0)
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numlines = DEFLINE;
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else if (bytecnt != 0)
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usage();
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if (ifd == -1) /* Stdin by default. */
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ifd = 0;
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if (bytecnt) {
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split1();
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exit (0);
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}
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split2();
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if (pflag)
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regfree(&rgx);
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exit(0);
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}
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/*
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* split1 --
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* Split the input by bytes.
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*/
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void
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split1(void)
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{
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off_t bcnt;
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char *C;
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ssize_t dist, len;
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for (bcnt = 0;;)
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switch ((len = read(ifd, bfr, MAXBSIZE))) {
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case 0:
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exit(0);
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case -1:
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err(EX_IOERR, "read");
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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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if (bcnt + len >= bytecnt) {
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dist = bytecnt - bcnt;
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if (write(ofd, bfr, dist) != dist)
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err(EX_IOERR, "write");
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len -= dist;
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for (C = bfr + dist; len >= bytecnt;
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len -= bytecnt, C += bytecnt) {
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newfile();
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if (write(ofd,
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C, bytecnt) != bytecnt)
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err(EX_IOERR, "write");
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}
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if (len != 0) {
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newfile();
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if (write(ofd, C, len) != len)
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err(EX_IOERR, "write");
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} else
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file_open = 0;
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bcnt = len;
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} else {
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bcnt += len;
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if (write(ofd, bfr, len) != len)
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err(EX_IOERR, "write");
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}
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}
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}
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/*
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* split2 --
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* Split the input by lines.
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*/
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void
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split2(void)
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{
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long lcnt = 0;
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FILE *infp;
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/* Stick a stream on top of input file descriptor */
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if ((infp = fdopen(ifd, "r")) == NULL)
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err(EX_NOINPUT, "fdopen");
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/* Process input one line at a time */
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while (fgets(bfr, sizeof(bfr), infp) != NULL) {
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const int len = strlen(bfr);
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/* If line is too long to deal with, just write it out */
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if (bfr[len - 1] != '\n')
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goto writeit;
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/* Check if we need to start a new file */
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if (pflag) {
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regmatch_t pmatch;
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pmatch.rm_so = 0;
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pmatch.rm_eo = len - 1;
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if (regexec(&rgx, bfr, 0, &pmatch, REG_STARTEND) == 0)
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newfile();
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} else if (lcnt++ == numlines) {
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newfile();
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lcnt = 1;
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}
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writeit:
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/* Open output file if needed */
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if (!file_open)
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newfile();
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/* Write out line */
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if (write(ofd, bfr, len) != len)
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err(EX_IOERR, "write");
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}
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/* EOF or error? */
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if (ferror(infp))
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err(EX_IOERR, "read");
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else
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exit(0);
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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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*/
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void
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newfile(void)
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{
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long i, maxfiles, tfnum;
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static long fnum;
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static int defname;
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static char *fpnt;
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if (ofd == -1) {
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if (fname[0] == '\0') {
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fname[0] = 'x';
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fpnt = fname + 1;
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defname = 1;
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} else {
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fpnt = fname + strlen(fname);
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defname = 0;
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}
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ofd = fileno(stdout);
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}
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/* maxfiles = 26^sufflen, but don't use libm. */
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for (maxfiles = 1, i = 0; i < sufflen; i++)
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if ((maxfiles *= 26) <= 0)
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errx(EX_USAGE, "suffix is too long (max %ld)", i);
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/*
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* Hack to increase max files; original code wandered through
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* magic characters.
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*/
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if (fnum == maxfiles) {
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if (!defname || fname[0] == 'z')
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errx(EX_DATAERR, "too many files");
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++fname[0];
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fnum = 0;
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}
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/* Generate suffix of sufflen letters */
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tfnum = fnum;
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i = sufflen - 1;
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do {
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fpnt[i] = tfnum % 26 + 'a';
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tfnum /= 26;
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} while (i-- > 0);
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fpnt[sufflen] = '\0';
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++fnum;
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if (!freopen(fname, "w", stdout))
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err(EX_IOERR, "%s", fname);
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file_open = 1;
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: split [-a sufflen] [-b byte_count] [-l line_count] [-p pattern]\n");
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(void)fprintf(stderr,
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" [file [prefix]]\n");
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exit(EX_USAGE);
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}
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