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Diffstat (limited to 'usr.bin/split/split.c')
-rw-r--r-- | usr.bin/split/split.c | 288 |
1 files changed, 288 insertions, 0 deletions
diff --git a/usr.bin/split/split.c b/usr.bin/split/split.c new file mode 100644 index 0000000..198532b --- /dev/null +++ b/usr.bin/split/split.c @@ -0,0 +1,288 @@ +/* + * 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. + */ + +#ifndef lint +static char copyright[] = +"@(#) Copyright (c) 1987, 1993, 1994\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)split.c 8.2 (Berkeley) 4/16/94"; +#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. */ + +long bytecnt; /* Byte count to split on. */ +long numlines; /* Line count to split on. */ +int file_open; /* If a file open. */ +int ifd = -1, ofd = -1; /* Input/output file descriptors. */ +char bfr[MAXBSIZE]; /* I/O buffer. */ +char fname[MAXPATHLEN]; /* File name prefix. */ + +void newfile __P((void)); +void split1 __P((void)); +void split2 __P((void)); +void usage __P((void)); + +int +main(argc, argv) + int argc; + char *argv[]; +{ + int ch; + char *ep, *p; + + while ((ch = getopt(argc, argv, "-0123456789b:l:")) != EOF) + 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 = strtol(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 *= 1048576; + break; + case 'l': /* Line count. */ + if (numlines != 0) + usage(); + if ((numlines = strtol(optarg, &ep, 10)) <= 0 || *p) + 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(); + exit (0); + } + split2(); + exit(0); +} + +/* + * split1 -- + * Split the input by bytes. + */ +void +split1() +{ + long bcnt; + int dist, len; + char *C; + + 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 (write(ofd, bfr, dist) != dist) + err(1, "write"); + len -= dist; + for (C = bfr + dist; len >= bytecnt; + len -= bytecnt, C += bytecnt) { + newfile(); + if (write(ofd, + C, (int)bytecnt) != bytecnt) + err(1, "write"); + } + if (len) { + newfile(); + if (write(ofd, C, len) != len) + err(1, "write"); + } else + file_open = 0; + bcnt = len; + } else { + bcnt += len; + if (write(ofd, bfr, len) != len) + err(1, "write"); + } + } +} + +/* + * split2 -- + * Split the input by lines. + */ +void +split2() +{ + long lcnt; + int len, bcnt; + char *Ce, *Cs; + + 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 (write(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 (write(ofd, Cs, bcnt) != bcnt) + err(1, "write"); + } + } +} + +/* + * newfile -- + * Open a new output file. + */ +void +newfile() +{ + static long 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); +} + +void +usage() +{ + (void)fprintf(stderr, +"usage: split [-b byte_count] [-l line_count] [file [prefix]]\n"); + exit(1); +} |