split.c revision 1.6
1 /* $NetBSD: split.c,v 1.6 1997/10/19 23:26:58 lukem Exp $ */ 2 3 /* 4 * Copyright (c) 1987, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 #include <sys/cdefs.h> 37 #ifndef lint 38 __COPYRIGHT("@(#) Copyright (c) 1987, 1993, 1994\n\ 39 The Regents of the University of California. All rights reserved.\n"); 40 #endif /* not lint */ 41 42 #ifndef lint 43 #if 0 44 static char sccsid[] = "@(#)split.c 8.3 (Berkeley) 4/25/94"; 45 #endif 46 __RCSID("$NetBSD: split.c,v 1.6 1997/10/19 23:26:58 lukem Exp $"); 47 #endif /* not lint */ 48 49 #include <sys/param.h> 50 51 #include <ctype.h> 52 #include <err.h> 53 #include <fcntl.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 #include <unistd.h> 58 59 #define DEFLINE 1000 /* Default num lines per file. */ 60 61 long bytecnt; /* Byte count to split on. */ 62 long numlines; /* Line count to split on. */ 63 int file_open; /* If a file open. */ 64 int ifd = -1, ofd = -1; /* Input/output file descriptors. */ 65 char bfr[MAXBSIZE]; /* I/O buffer. */ 66 char fname[MAXPATHLEN]; /* File name prefix. */ 67 68 int main __P((int, char **)); 69 void newfile __P((void)); 70 void split1 __P((void)); 71 void split2 __P((void)); 72 void usage __P((void)); 73 74 int 75 main(argc, argv) 76 int argc; 77 char *argv[]; 78 { 79 int ch; 80 char *ep, *p; 81 82 while ((ch = getopt(argc, argv, "-0123456789b:l:")) != -1) 83 switch (ch) { 84 case '0': case '1': case '2': case '3': case '4': 85 case '5': case '6': case '7': case '8': case '9': 86 /* 87 * Undocumented kludge: split was originally designed 88 * to take a number after a dash. 89 */ 90 if (numlines == 0) { 91 p = argv[optind - 1]; 92 if (p[0] == '-' && p[1] == ch && !p[2]) 93 numlines = strtol(++p, &ep, 10); 94 else 95 numlines = 96 strtol(argv[optind] + 1, &ep, 10); 97 if (numlines <= 0 || *ep) 98 errx(1, 99 "%s: illegal line count.", optarg); 100 } 101 break; 102 case '-': /* Undocumented: historic stdin flag. */ 103 if (ifd != -1) 104 usage(); 105 ifd = 0; 106 break; 107 case 'b': /* Byte count. */ 108 if ((bytecnt = strtol(optarg, &ep, 10)) <= 0 || 109 (*ep != '\0' && *ep != 'k' && *ep != 'm')) 110 errx(1, "%s: illegal byte count.", optarg); 111 if (*ep == 'k') 112 bytecnt *= 1024; 113 else if (*ep == 'm') 114 bytecnt *= 1048576; 115 break; 116 case 'l': /* Line count. */ 117 if (numlines != 0) 118 usage(); 119 if ((numlines = strtol(optarg, &ep, 10)) <= 0 || *ep) 120 errx(1, "%s: illegal line count.", optarg); 121 break; 122 default: 123 usage(); 124 } 125 argv += optind; 126 argc -= optind; 127 128 if (*argv != NULL) 129 if (ifd == -1) { /* Input file. */ 130 if ((ifd = open(*argv, O_RDONLY, 0)) < 0) 131 err(1, "%s", *argv); 132 ++argv; 133 } 134 if (*argv != NULL) /* File name prefix. */ 135 (void)strcpy(fname, *argv++); 136 if (*argv != NULL) 137 usage(); 138 139 if (numlines == 0) 140 numlines = DEFLINE; 141 else if (bytecnt) 142 usage(); 143 144 if (ifd == -1) /* Stdin by default. */ 145 ifd = 0; 146 147 if (bytecnt) { 148 split1(); 149 exit (0); 150 } 151 split2(); 152 exit(0); 153 } 154 155 /* 156 * split1 -- 157 * Split the input by bytes. 158 */ 159 void 160 split1() 161 { 162 long bcnt; 163 int dist, len; 164 char *C; 165 166 for (bcnt = 0;;) 167 switch (len = read(ifd, bfr, MAXBSIZE)) { 168 case 0: 169 exit(0); 170 case -1: 171 err(1, "read"); 172 /* NOTREACHED */ 173 default: 174 if (!file_open) { 175 newfile(); 176 file_open = 1; 177 } 178 if (bcnt + len >= bytecnt) { 179 dist = bytecnt - bcnt; 180 if (write(ofd, bfr, dist) != dist) 181 err(1, "write"); 182 len -= dist; 183 for (C = bfr + dist; len >= bytecnt; 184 len -= bytecnt, C += bytecnt) { 185 newfile(); 186 if (write(ofd, 187 C, (int)bytecnt) != bytecnt) 188 err(1, "write"); 189 } 190 if (len) { 191 newfile(); 192 if (write(ofd, C, len) != len) 193 err(1, "write"); 194 } else 195 file_open = 0; 196 bcnt = len; 197 } else { 198 bcnt += len; 199 if (write(ofd, bfr, len) != len) 200 err(1, "write"); 201 } 202 } 203 } 204 205 /* 206 * split2 -- 207 * Split the input by lines. 208 */ 209 void 210 split2() 211 { 212 long lcnt; 213 int len, bcnt; 214 char *Ce, *Cs; 215 216 for (lcnt = 0;;) 217 switch (len = read(ifd, bfr, MAXBSIZE)) { 218 case 0: 219 exit(0); 220 case -1: 221 err(1, "read"); 222 /* NOTREACHED */ 223 default: 224 if (!file_open) { 225 newfile(); 226 file_open = 1; 227 } 228 for (Cs = Ce = bfr; len--; Ce++) 229 if (*Ce == '\n' && ++lcnt == numlines) { 230 bcnt = Ce - Cs + 1; 231 if (write(ofd, Cs, bcnt) != bcnt) 232 err(1, "write"); 233 lcnt = 0; 234 Cs = Ce + 1; 235 if (len) 236 newfile(); 237 else 238 file_open = 0; 239 } 240 if (Cs < Ce) { 241 bcnt = Ce - Cs; 242 if (write(ofd, Cs, bcnt) != bcnt) 243 err(1, "write"); 244 } 245 } 246 } 247 248 /* 249 * newfile -- 250 * Open a new output file. 251 */ 252 void 253 newfile() 254 { 255 static long fnum; 256 static int defname; 257 static char *fpnt; 258 259 if (ofd == -1) { 260 if (fname[0] == '\0') { 261 fname[0] = 'x'; 262 fpnt = fname + 1; 263 defname = 1; 264 } else { 265 fpnt = fname + strlen(fname); 266 defname = 0; 267 } 268 ofd = fileno(stdout); 269 } 270 /* 271 * Hack to increase max files; original code wandered through 272 * magic characters. Maximum files is 3 * 26 * 26 == 2028 273 */ 274 #define MAXFILES 676 275 if (fnum == MAXFILES) { 276 if (!defname || fname[0] == 'z') 277 errx(1, "too many files."); 278 ++fname[0]; 279 fnum = 0; 280 } 281 fpnt[0] = fnum / 26 + 'a'; 282 fpnt[1] = fnum % 26 + 'a'; 283 ++fnum; 284 if (!freopen(fname, "w", stdout)) 285 err(1, "%s", fname); 286 } 287 288 void 289 usage() 290 { 291 (void)fprintf(stderr, 292 "usage: split [-b byte_count] [-l line_count] [file [prefix]]\n"); 293 exit(1); 294 } 295
Indexes created Tue Sep 23 07:09:52 GMT 2025