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IABSD.fr/src/usr.bin/split/split.c
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/* $OpenBSD: split.c,v 1.23 2021/11/28 19:28:42 deraadt Exp $ */ /* $NetBSD: split.c,v 1.5 1995/08/31 22:22:05 jtc 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/types.h> #include <ctype.h> #include <err.h> #include <fcntl.h> #include <limits.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <regex.h> #define _MAXBSIZE (64 * 1024) #define DEFLINE 1000 /* Default num lines per file. */ ssize_t 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[PATH_MAX]; /* File name prefix. */ regex_t rgx; int pflag; int sufflen = 2; /* File name suffix length. */ void newfile(void); void split1(void); void split2(void); __dead void usage(void); int main(int argc, char *argv[]) { int ch, scale; char *ep, *p; const char *errstr; if (pledge("stdio rpath wpath cpath", NULL) == -1) err(1, "pledge"); while ((ch = getopt(argc, argv, "0123456789a:b:l: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(1, "%s: illegal line count", optarg); } break; case '-': /* Undocumented: historic stdin flag. */ if (ifd != -1) usage(); ifd = 0; break; case 'a': /* suffix length. */ sufflen = strtonum(optarg, 1, NAME_MAX, &errstr); if (errstr) errx(1, "%s: %s", optarg, errstr); 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') scale = 1024; else if (*ep == 'm') scale = 1048576; else scale = 1; if (bytecnt > SSIZE_MAX / scale) errx(1, "%s: byte count too large", optarg); bytecnt *= scale; break; case 'p' : /* pattern matching. */ if (regcomp(&rgx, optarg, REG_EXTENDED|REG_NOSUB) != 0) errx(1, "%s: illegal regexp", optarg); pflag = 1; break; case 'l': /* Line count. */ if (numlines != 0) usage(); if ((numlines = strtol(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) err(1, "%s", *argv); ++argv; } if (*argv != NULL) /* File name prefix. */ (void)strlcpy(fname, *argv++, sizeof(fname)); if (*argv != NULL) usage(); if (strlen(fname) + sufflen >= sizeof(fname)) errx(1, "suffix is too long"); if (pflag && (numlines != 0 || bytecnt != 0)) usage(); if (numlines == 0) numlines = DEFLINE; else if (bytecnt != 0) usage(); if (ifd == -1) /* Stdin by default. */ ifd = 0; if (bytecnt) { split1(); exit (0); } split2(); if (pflag) regfree(&rgx); exit(0); } /* * split1 -- * Split the input by bytes. */ void split1(void) { ssize_t bcnt, dist, len; char *C; for (bcnt = 0;;) switch ((len = read(ifd, bfr, sizeof(bfr)))) { case 0: exit(0); case -1: err(1, "read"); /* NOTREACHED */ default: if (!file_open) newfile(); 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, bytecnt) != bytecnt) err(1, "write"); } if (len != 0) { 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(void) { long lcnt = 0; FILE *infp; /* Stick a stream on top of input file descriptor */ if ((infp = fdopen(ifd, "r")) == NULL) err(1, "fdopen"); /* Process input one line at a time */ while (fgets(bfr, sizeof(bfr), infp) != NULL) { const int len = strlen(bfr); if (len == 0) continue; /* 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(1, "write"); } /* EOF or error? */ if (ferror(infp)) err(1, "read"); else exit(0); } /* * newfile -- * Open a new output file. */ void newfile(void) { static char *suffix, *sufftail; char *sptr; if (ofd == -1) { ofd = fileno(stdout); if (*fname == '\0') { *fname = 'x'; /* no name specified, use 'x' */ memset(fname + 1, 'a', sufflen); suffix = fname; sufflen++; /* treat 'x' as part of suffix */ } else { suffix = fname + strlen(fname); memset(suffix, 'a', sufflen); } suffix[sufflen] = '\0'; sufftail = suffix + sufflen - 1; } else { for (sptr = sufftail; sptr >= suffix; sptr--) { if (*sptr != 'z') { (*sptr)++; break; } else *sptr = 'a'; } if (sptr < suffix) errx(1, "too many files"); } if (!freopen(fname, "w", stdout)) err(1, "%s", fname); file_open = 1; } __dead void usage(void) { extern char *__progname; (void)fprintf(stderr, "usage: %s [-a suffix_length]\n" " [-b byte_count[k|m] | -l line_count | -p pattern] " "[file [name]]\n", __progname); exit(1); }