/* $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 #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 #include #include #include #include #include #include #include #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); }