| 1 | /* |
| 2 | * Copyright (c) 1987 Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer in the |
| 12 | * documentation and/or other materials provided with the distribution. |
| 13 | * 3. All advertising materials mentioning features or use of this software |
| 14 | * must display the following acknowledgement: |
| 15 | * This product includes software developed by the University of |
| 16 | * California, Berkeley and its contributors. |
| 17 | * 4. Neither the name of the University nor the names of its contributors |
| 18 | * may be used to endorse or promote products derived from this software |
| 19 | * without specific prior written permission. |
| 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| 22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 31 | * SUCH DAMAGE. |
| 32 | */ |
| 33 | |
| 34 | #ifndef lint |
| 35 | char copyright[] = |
| 36 | "@(#) Copyright (c) 1987 Regents of the University of California.\n\ |
| 37 | All rights reserved.\n"; |
| 38 | #endif /* not lint */ |
| 39 | |
| 40 | #ifndef lint |
| 41 | static char sccsid[] = "@(#)split.c 4.8 (Berkeley) 6/1/90"; |
| 42 | #endif /* not lint */ |
| 43 | |
| 44 | #include <sys/param.h> |
| 45 | #include <sys/file.h> |
| 46 | #include <stdio.h> |
| 47 | #include <ctype.h> |
| 48 | |
| 49 | #define DEFLINE 1000 /* default num lines per file */ |
| 50 | #define ERR -1 /* general error */ |
| 51 | #define NO 0 /* no/false */ |
| 52 | #define OK 0 /* okay exit */ |
| 53 | #define YES 1 /* yes/true */ |
| 54 | |
| 55 | static long bytecnt, /* byte count to split on */ |
| 56 | numlines; /* lines in each file */ |
| 57 | static int ifd = ERR, /* input file descriptor */ |
| 58 | ofd = ERR; /* output file descriptor */ |
| 59 | static short file_open; /* if a file open */ |
| 60 | static char bfr[MAXBSIZE], /* I/O buffer */ |
| 61 | fname[MAXPATHLEN]; /* file name */ |
| 62 | |
| 63 | main(argc, argv) |
| 64 | int argc; |
| 65 | char **argv; |
| 66 | { |
| 67 | register int cnt; |
| 68 | long atol(); |
| 69 | char *strcpy(); |
| 70 | |
| 71 | for (cnt = 1; cnt < argc; ++cnt) { |
| 72 | if (argv[cnt][0] == '-') |
| 73 | switch(argv[cnt][1]) { |
| 74 | case 0: /* stdin by request */ |
| 75 | if (ifd != ERR) |
| 76 | usage(); |
| 77 | ifd = 0; |
| 78 | break; |
| 79 | case 'b': /* byte count split */ |
| 80 | if (numlines) |
| 81 | usage(); |
| 82 | if (!argv[cnt][2]) |
| 83 | bytecnt = atol(argv[++cnt]); |
| 84 | else |
| 85 | bytecnt = atol(argv[cnt] + 2); |
| 86 | if (bytecnt <= 0) { |
| 87 | fputs("split: byte count must be greater than zero.\n", stderr); |
| 88 | usage(); |
| 89 | } |
| 90 | break; |
| 91 | default: |
| 92 | if (!isdigit(argv[cnt][1]) || bytecnt) |
| 93 | usage(); |
| 94 | if ((numlines = atol(argv[cnt] + 1)) <= 0) { |
| 95 | fputs("split: line count must be greater than zero.\n", stderr); |
| 96 | usage(); |
| 97 | } |
| 98 | break; |
| 99 | } |
| 100 | else if (ifd == ERR) { /* input file */ |
| 101 | if ((ifd = open(argv[cnt], O_RDONLY, 0)) < 0) { |
| 102 | perror(argv[cnt]); |
| 103 | exit(1); |
| 104 | } |
| 105 | } |
| 106 | else if (!*fname) /* output file prefix */ |
| 107 | strcpy(fname, argv[cnt]); |
| 108 | else |
| 109 | usage(); |
| 110 | } |
| 111 | if (ifd == ERR) /* stdin by default */ |
| 112 | ifd = 0; |
| 113 | if (bytecnt) |
| 114 | split1(); |
| 115 | if (!numlines) |
| 116 | numlines = DEFLINE; |
| 117 | split2(); |
| 118 | exit(0); |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | * split1 -- |
| 123 | * split by bytes |
| 124 | */ |
| 125 | split1() |
| 126 | { |
| 127 | register long bcnt; |
| 128 | register int dist, len; |
| 129 | register char *C; |
| 130 | |
| 131 | for (bcnt = 0;;) |
| 132 | switch(len = read(ifd, bfr, MAXBSIZE)) { |
| 133 | case 0: |
| 134 | exit(OK); |
| 135 | case ERR: |
| 136 | perror("read"); |
| 137 | exit(1); |
| 138 | default: |
| 139 | if (!file_open) { |
| 140 | newfile(); |
| 141 | file_open = YES; |
| 142 | } |
| 143 | if (bcnt + len >= bytecnt) { |
| 144 | dist = bytecnt - bcnt; |
| 145 | if (write(ofd, bfr, dist) != dist) |
| 146 | wrerror(); |
| 147 | len -= dist; |
| 148 | for (C = bfr + dist; len >= bytecnt; len -= bytecnt, C += bytecnt) { |
| 149 | newfile(); |
| 150 | if (write(ofd, C, (int)bytecnt) != bytecnt) |
| 151 | wrerror(); |
| 152 | } |
| 153 | if (len) { |
| 154 | newfile(); |
| 155 | if (write(ofd, C, len) != len) |
| 156 | wrerror(); |
| 157 | } |
| 158 | else |
| 159 | file_open = NO; |
| 160 | bcnt = len; |
| 161 | } |
| 162 | else { |
| 163 | bcnt += len; |
| 164 | if (write(ofd, bfr, len) != len) |
| 165 | wrerror(); |
| 166 | } |
| 167 | } |
| 168 | } |
| 169 | |
| 170 | /* |
| 171 | * split2 -- |
| 172 | * split by lines |
| 173 | */ |
| 174 | split2() |
| 175 | { |
| 176 | register char *Ce, *Cs; |
| 177 | register long lcnt; |
| 178 | register int len, bcnt; |
| 179 | |
| 180 | for (lcnt = 0;;) |
| 181 | switch(len = read(ifd, bfr, MAXBSIZE)) { |
| 182 | case 0: |
| 183 | exit(0); |
| 184 | case ERR: |
| 185 | perror("read"); |
| 186 | exit(1); |
| 187 | default: |
| 188 | if (!file_open) { |
| 189 | newfile(); |
| 190 | file_open = YES; |
| 191 | } |
| 192 | for (Cs = Ce = bfr; len--; Ce++) |
| 193 | if (*Ce == '\n' && ++lcnt == numlines) { |
| 194 | bcnt = Ce - Cs + 1; |
| 195 | if (write(ofd, Cs, bcnt) != bcnt) |
| 196 | wrerror(); |
| 197 | lcnt = 0; |
| 198 | Cs = Ce + 1; |
| 199 | if (len) |
| 200 | newfile(); |
| 201 | else |
| 202 | file_open = NO; |
| 203 | } |
| 204 | if (Cs < Ce) { |
| 205 | bcnt = Ce - Cs; |
| 206 | if (write(ofd, Cs, bcnt) != bcnt) |
| 207 | wrerror(); |
| 208 | } |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * newfile -- |
| 214 | * open a new file |
| 215 | */ |
| 216 | newfile() |
| 217 | { |
| 218 | static long fnum; |
| 219 | static short defname; |
| 220 | static char *fpnt; |
| 221 | |
| 222 | if (ofd == ERR) { |
| 223 | if (fname[0]) { |
| 224 | fpnt = fname + strlen(fname); |
| 225 | defname = NO; |
| 226 | } |
| 227 | else { |
| 228 | fname[0] = 'x'; |
| 229 | fpnt = fname + 1; |
| 230 | defname = YES; |
| 231 | } |
| 232 | ofd = fileno(stdout); |
| 233 | } |
| 234 | /* |
| 235 | * hack to increase max files; original code just wandered through |
| 236 | * magic characters. Maximum files is 3 * 26 * 26 == 2028 |
| 237 | */ |
| 238 | #define MAXFILES 676 |
| 239 | if (fnum == MAXFILES) { |
| 240 | if (!defname || fname[0] == 'z') { |
| 241 | fputs("split: too many files.\n", stderr); |
| 242 | exit(1); |
| 243 | } |
| 244 | ++fname[0]; |
| 245 | fnum = 0; |
| 246 | } |
| 247 | fpnt[0] = fnum / 26 + 'a'; |
| 248 | fpnt[1] = fnum % 26 + 'a'; |
| 249 | ++fnum; |
| 250 | if (!freopen(fname, "w", stdout)) { |
| 251 | fprintf(stderr, "split: unable to write to %s.\n", fname); |
| 252 | exit(ERR); |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | /* |
| 257 | * usage -- |
| 258 | * print usage message and die |
| 259 | */ |
| 260 | usage() |
| 261 | { |
| 262 | fputs("usage: split [-] [-#] [-b byte_count] [file [prefix]]\n", stderr); |
| 263 | exit(1); |
| 264 | } |
| 265 | |
| 266 | /* |
| 267 | * wrerror -- |
| 268 | * write error |
| 269 | */ |
| 270 | wrerror() |
| 271 | { |
| 272 | perror("split: write"); |
| 273 | exit(1); |
| 274 | } |