/src/freebsd/usr.bin/split/split.c
C | 394 lines | 292 code | 42 blank | 60 comment | 128 complexity | 5e8e63f8522455152b11327b1ee2c352 MD5 | raw file
Possible License(s): CC0-1.0, MIT, LGPL-2.0, LGPL-3.0, WTFPL, GPL-2.0, BSD-2-Clause, AGPL-3.0, CC-BY-SA-3.0, MPL-2.0, JSON, BSD-3-Clause-No-Nuclear-License-2014, LGPL-2.1, CPL-1.0, AGPL-1.0, 0BSD, ISC, Apache-2.0, GPL-3.0, IPL-1.0, MPL-2.0-no-copyleft-exception, BSD-3-Clause
- /*
- * 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.
- * 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>
- __FBSDID("$FreeBSD$");
- #ifndef lint
- static const char copyright[] =
- "@(#) Copyright (c) 1987, 1993, 1994\n\
- The Regents of the University of California. All rights reserved.\n";
- #endif
- #ifndef lint
- static const char sccsid[] = "@(#)split.c 8.2 (Berkeley) 4/16/94";
- #endif
- #include <sys/param.h>
- #include <sys/types.h>
- #include <sys/stat.h>
- #include <ctype.h>
- #include <err.h>
- #include <errno.h>
- #include <fcntl.h>
- #include <inttypes.h>
- #include <limits.h>
- #include <locale.h>
- #include <stdint.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include <regex.h>
- #include <sysexits.h>
- #define DEFLINE 1000 /* Default num lines per file. */
- static off_t bytecnt; /* Byte count to split on. */
- static off_t chunks = 0; /* Chunks count to split into. */
- static long numlines; /* Line count to split on. */
- static int file_open; /* If a file open. */
- static int ifd = -1, ofd = -1; /* Input/output file descriptors. */
- static char bfr[MAXBSIZE]; /* I/O buffer. */
- static char fname[MAXPATHLEN]; /* File name prefix. */
- static regex_t rgx;
- static int pflag;
- static long sufflen = 2; /* File name suffix length. */
- static void newfile(void);
- static void split1(void);
- static void split2(void);
- static void split3(void);
- static void usage(void);
- int
- main(int argc, char **argv)
- {
- intmax_t bytecnti;
- long scale;
- int ch;
- char *ep, *p;
- setlocale(LC_ALL, "");
- while ((ch = getopt(argc, argv, "0123456789a:b:l:n:p:")) != -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(EX_USAGE,
- "%s: illegal line count", optarg);
- }
- break;
- case 'a': /* Suffix length */
- if ((sufflen = strtol(optarg, &ep, 10)) <= 0 || *ep)
- errx(EX_USAGE,
- "%s: illegal suffix length", optarg);
- break;
- case 'b': /* Byte count. */
- errno = 0;
- if ((bytecnti = strtoimax(optarg, &ep, 10)) <= 0 ||
- strchr("kKmMgG", *ep) == NULL || errno != 0)
- errx(EX_USAGE,
- "%s: illegal byte count", optarg);
- if (*ep == 'k' || *ep == 'K')
- scale = 1024;
- else if (*ep == 'm' || *ep == 'M')
- scale = 1024 * 1024;
- else if (*ep == 'g' || *ep == 'G')
- scale = 1024 * 1024 * 1024;
- else
- scale = 1;
- if (bytecnti > OFF_MAX / scale)
- errx(EX_USAGE, "%s: offset too large", optarg);
- bytecnt = (off_t)(bytecnti * scale);
- break;
- case 'l': /* Line count. */
- if (numlines != 0)
- usage();
- if ((numlines = strtol(optarg, &ep, 10)) <= 0 || *ep)
- errx(EX_USAGE,
- "%s: illegal line count", optarg);
- break;
- case 'n': /* Chunks. */
- if (!isdigit((unsigned char)optarg[0]) ||
- (chunks = (size_t)strtoul(optarg, &ep, 10)) == 0 ||
- *ep != '\0') {
- errx(EX_USAGE, "%s: illegal number of chunks",
- optarg);
- }
- break;
- case 'p': /* pattern matching. */
- if (regcomp(&rgx, optarg, REG_EXTENDED|REG_NOSUB) != 0)
- errx(EX_USAGE, "%s: illegal regexp", optarg);
- pflag = 1;
- break;
- default:
- usage();
- }
- argv += optind;
- argc -= optind;
- if (*argv != NULL) { /* Input file. */
- if (strcmp(*argv, "-") == 0)
- ifd = STDIN_FILENO;
- else if ((ifd = open(*argv, O_RDONLY, 0)) < 0)
- err(EX_NOINPUT, "%s", *argv);
- ++argv;
- }
- if (*argv != NULL) /* File name prefix. */
- if (strlcpy(fname, *argv++, sizeof(fname)) >= sizeof(fname))
- errx(EX_USAGE, "file name prefix is too long");
- if (*argv != NULL)
- usage();
- if (strlen(fname) + (unsigned long)sufflen >= sizeof(fname))
- errx(EX_USAGE, "suffix is too long");
- if (pflag && (numlines != 0 || bytecnt != 0 || chunks != 0))
- usage();
- if (numlines == 0)
- numlines = DEFLINE;
- else if (bytecnt != 0 || chunks != 0)
- usage();
- if (bytecnt && chunks)
- usage();
- if (ifd == -1) /* Stdin by default. */
- ifd = 0;
- if (bytecnt) {
- split1();
- exit (0);
- } else if (chunks) {
- split3();
- exit (0);
- }
- split2();
- if (pflag)
- regfree(&rgx);
- exit(0);
- }
- /*
- * split1 --
- * Split the input by bytes.
- */
- static void
- split1(void)
- {
- off_t bcnt;
- char *C;
- ssize_t dist, len;
- int nfiles;
- nfiles = 0;
- for (bcnt = 0;;)
- switch ((len = read(ifd, bfr, MAXBSIZE))) {
- case 0:
- exit(0);
- case -1:
- err(EX_IOERR, "read");
- /* NOTREACHED */
- default:
- if (!file_open) {
- if (!chunks || (nfiles < chunks)) {
- newfile();
- nfiles++;
- }
- }
- if (bcnt + len >= bytecnt) {
- dist = bytecnt - bcnt;
- if (write(ofd, bfr, dist) != dist)
- err(EX_IOERR, "write");
- len -= dist;
- for (C = bfr + dist; len >= bytecnt;
- len -= bytecnt, C += bytecnt) {
- if (!chunks || (nfiles < chunks)) {
- newfile();
- nfiles++;
- }
- if (write(ofd,
- C, bytecnt) != bytecnt)
- err(EX_IOERR, "write");
- }
- if (len != 0) {
- if (!chunks || (nfiles < chunks)) {
- newfile();
- nfiles++;
- }
- if (write(ofd, C, len) != len)
- err(EX_IOERR, "write");
- } else
- file_open = 0;
- bcnt = len;
- } else {
- bcnt += len;
- if (write(ofd, bfr, len) != len)
- err(EX_IOERR, "write");
- }
- }
- }
- /*
- * split2 --
- * Split the input by lines.
- */
- static void
- split2(void)
- {
- long lcnt = 0;
- FILE *infp;
- /* Stick a stream on top of input file descriptor */
- if ((infp = fdopen(ifd, "r")) == NULL)
- err(EX_NOINPUT, "fdopen");
- /* Process input one line at a time */
- while (fgets(bfr, sizeof(bfr), infp) != NULL) {
- const int len = strlen(bfr);
- /* If line is too long to deal with, just write it out */
- if (bfr[len - 1] != '\n')
- goto writeit;
- /* Check if we need to start a new file */
- if (pflag) {
- regmatch_t pmatch;
- pmatch.rm_so = 0;
- pmatch.rm_eo = len - 1;
- if (regexec(&rgx, bfr, 0, &pmatch, REG_STARTEND) == 0)
- newfile();
- } else if (lcnt++ == numlines) {
- newfile();
- lcnt = 1;
- }
- writeit:
- /* Open output file if needed */
- if (!file_open)
- newfile();
- /* Write out line */
- if (write(ofd, bfr, len) != len)
- err(EX_IOERR, "write");
- }
- /* EOF or error? */
- if (ferror(infp))
- err(EX_IOERR, "read");
- else
- exit(0);
- }
- /*
- * split3 --
- * Split the input into specified number of chunks
- */
- static void
- split3(void)
- {
- 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 */
- }
- bytecnt = sb.st_size / chunks;
- split1();
- }
- /*
- * newfile --
- * Open a new output file.
- */
- static void
- newfile(void)
- {
- long i, maxfiles, tfnum;
- static long fnum;
- static char *fpnt;
- if (ofd == -1) {
- if (fname[0] == '\0') {
- fname[0] = 'x';
- fpnt = fname + 1;
- } else {
- fpnt = fname + strlen(fname);
- }
- ofd = fileno(stdout);
- }
- /* maxfiles = 26^sufflen, but don't use libm. */
- for (maxfiles = 1, i = 0; i < sufflen; i++)
- if ((maxfiles *= 26) <= 0)
- errx(EX_USAGE, "suffix is too long (max %ld)", i);
- if (fnum == maxfiles)
- errx(EX_DATAERR, "too many files");
- /* Generate suffix of sufflen letters */
- tfnum = fnum;
- i = sufflen - 1;
- do {
- fpnt[i] = tfnum % 26 + 'a';
- tfnum /= 26;
- } while (i-- > 0);
- fpnt[sufflen] = '\0';
- ++fnum;
- if (!freopen(fname, "w", stdout))
- err(EX_IOERR, "%s", fname);
- file_open = 1;
- }
- static void
- usage(void)
- {
- (void)fprintf(stderr,
- "usage: split [-l line_count] [-a suffix_length] [file [prefix]]\n"
- " split -b byte_count[K|k|M|m|G|g] [-a suffix_length] [file [prefix]]\n"
- " split -n chunk_count [-a suffix_length] [file [prefix]]\n"
- " split -p pattern [-a suffix_length] [file [prefix]]\n");
- exit(EX_USAGE);
- }