Annotation of src/usr.bin/split/split.c, Revision 1.21
1.21 ! millert 1: /* $OpenBSD: split.c,v 1.20 2015/10/09 01:37:08 deraadt Exp $ */
1.1 deraadt 2: /* $NetBSD: split.c,v 1.5 1995/08/31 22:22:05 jtc Exp $ */
3:
4: /*
5: * Copyright (c) 1987, 1993, 1994
6: * The Regents of the University of California. All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
1.8 millert 16: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
1.18 deraadt 33: #include <sys/param.h> /* MAXBSIZE */
1.4 millert 34: #include <sys/types.h>
1.1 deraadt 35:
36: #include <ctype.h>
37: #include <err.h>
38: #include <fcntl.h>
1.13 millert 39: #include <limits.h>
1.1 deraadt 40: #include <stdio.h>
41: #include <stdlib.h>
42: #include <string.h>
43: #include <unistd.h>
1.4 millert 44: #include <regex.h>
1.1 deraadt 45:
46: #define DEFLINE 1000 /* Default num lines per file. */
47:
1.13 millert 48: ssize_t bytecnt; /* Byte count to split on. */
1.1 deraadt 49: long numlines; /* Line count to split on. */
50: int file_open; /* If a file open. */
51: int ifd = -1, ofd = -1; /* Input/output file descriptors. */
52: char bfr[MAXBSIZE]; /* I/O buffer. */
1.18 deraadt 53: char fname[PATH_MAX]; /* File name prefix. */
1.4 millert 54: regex_t rgx;
55: int pflag;
1.12 millert 56: int sufflen = 2; /* File name suffix length. */
1.1 deraadt 57:
1.6 millert 58: void newfile(void);
59: void split1(void);
60: void split2(void);
1.13 millert 61: __dead void usage(void);
1.1 deraadt 62:
63: int
1.9 deraadt 64: main(int argc, char *argv[])
1.1 deraadt 65: {
1.13 millert 66: int ch, scale;
1.1 deraadt 67: char *ep, *p;
1.12 millert 68: const char *errstr;
1.19 deraadt 69:
1.20 deraadt 70: if (pledge("stdio rpath wpath cpath", NULL) == -1)
71: err(1, "pledge");
1.1 deraadt 72:
1.12 millert 73: while ((ch = getopt(argc, argv, "0123456789a:b:l:p:-")) != -1)
1.1 deraadt 74: switch (ch) {
75: case '0': case '1': case '2': case '3': case '4':
76: case '5': case '6': case '7': case '8': case '9':
77: /*
78: * Undocumented kludge: split was originally designed
79: * to take a number after a dash.
80: */
81: if (numlines == 0) {
82: p = argv[optind - 1];
83: if (p[0] == '-' && p[1] == ch && !p[2])
84: numlines = strtol(++p, &ep, 10);
85: else
86: numlines =
87: strtol(argv[optind] + 1, &ep, 10);
88: if (numlines <= 0 || *ep)
1.21 ! millert 89: errx(1, "%s: illegal line count",
! 90: optarg);
1.1 deraadt 91: }
92: break;
93: case '-': /* Undocumented: historic stdin flag. */
94: if (ifd != -1)
95: usage();
96: ifd = 0;
97: break;
1.12 millert 98: case 'a': /* suffix length. */
99: sufflen = strtonum(optarg, 1, NAME_MAX, &errstr);
100: if (errstr)
1.21 ! millert 101: errx(1, "%s: %s", optarg, errstr);
1.12 millert 102: break;
1.1 deraadt 103: case 'b': /* Byte count. */
104: if ((bytecnt = strtol(optarg, &ep, 10)) <= 0 ||
1.4 millert 105: (*ep != '\0' && *ep != 'k' && *ep != 'm'))
1.21 ! millert 106: errx(1, "%s: illegal byte count", optarg);
1.1 deraadt 107: if (*ep == 'k')
1.13 millert 108: scale = 1024;
1.1 deraadt 109: else if (*ep == 'm')
1.13 millert 110: scale = 1048576;
111: else
112: scale = 1;
113: if (bytecnt > SSIZE_MAX / scale)
1.21 ! millert 114: errx(1, "%s: byte count too large", optarg);
1.13 millert 115: bytecnt *= scale;
1.1 deraadt 116: break;
1.4 millert 117: case 'p' : /* pattern matching. */
118: if (regcomp(&rgx, optarg, REG_EXTENDED|REG_NOSUB) != 0)
1.21 ! millert 119: errx(1, "%s: illegal regexp", optarg);
1.4 millert 120: pflag = 1;
121: break;
1.1 deraadt 122: case 'l': /* Line count. */
123: if (numlines != 0)
124: usage();
125: if ((numlines = strtol(optarg, &ep, 10)) <= 0 || *ep)
1.21 ! millert 126: errx(1, "%s: illegal line count", optarg);
1.1 deraadt 127: break;
128: default:
129: usage();
130: }
131: argv += optind;
132: argc -= optind;
133:
134: if (*argv != NULL)
135: if (ifd == -1) { /* Input file. */
136: if ((ifd = open(*argv, O_RDONLY, 0)) < 0)
1.21 ! millert 137: err(1, "%s", *argv);
1.1 deraadt 138: ++argv;
139: }
140: if (*argv != NULL) /* File name prefix. */
1.5 deraadt 141: (void)strlcpy(fname, *argv++, sizeof(fname));
1.1 deraadt 142: if (*argv != NULL)
143: usage();
144:
1.12 millert 145: if (strlen(fname) + sufflen >= sizeof(fname))
1.21 ! millert 146: errx(1, "suffix is too long");
1.4 millert 147: if (pflag && (numlines != 0 || bytecnt != 0))
148: usage();
149:
1.1 deraadt 150: if (numlines == 0)
151: numlines = DEFLINE;
1.4 millert 152: else if (bytecnt != 0)
1.1 deraadt 153: usage();
154:
155: if (ifd == -1) /* Stdin by default. */
156: ifd = 0;
157:
158: if (bytecnt) {
159: split1();
160: exit (0);
161: }
162: split2();
1.4 millert 163: if (pflag)
164: regfree(&rgx);
1.1 deraadt 165: exit(0);
166: }
167:
168: /*
169: * split1 --
170: * Split the input by bytes.
171: */
172: void
1.9 deraadt 173: split1(void)
1.1 deraadt 174: {
1.13 millert 175: ssize_t bcnt, dist, len;
1.1 deraadt 176: char *C;
177:
178: for (bcnt = 0;;)
1.4 millert 179: switch ((len = read(ifd, bfr, MAXBSIZE))) {
1.1 deraadt 180: case 0:
181: exit(0);
182: case -1:
1.21 ! millert 183: err(1, "read");
1.1 deraadt 184: /* NOTREACHED */
185: default:
1.4 millert 186: if (!file_open)
1.1 deraadt 187: newfile();
188: if (bcnt + len >= bytecnt) {
189: dist = bytecnt - bcnt;
190: if (write(ofd, bfr, dist) != dist)
1.21 ! millert 191: err(1, "write");
1.1 deraadt 192: len -= dist;
193: for (C = bfr + dist; len >= bytecnt;
194: len -= bytecnt, C += bytecnt) {
195: newfile();
1.13 millert 196: if (write(ofd, C, bytecnt) != bytecnt)
1.21 ! millert 197: err(1, "write");
1.1 deraadt 198: }
1.4 millert 199: if (len != 0) {
1.1 deraadt 200: newfile();
201: if (write(ofd, C, len) != len)
1.21 ! millert 202: err(1, "write");
1.1 deraadt 203: } else
204: file_open = 0;
205: bcnt = len;
206: } else {
207: bcnt += len;
208: if (write(ofd, bfr, len) != len)
1.21 ! millert 209: err(1, "write");
1.1 deraadt 210: }
211: }
212: }
213:
214: /*
215: * split2 --
216: * Split the input by lines.
217: */
218: void
1.9 deraadt 219: split2(void)
1.1 deraadt 220: {
1.4 millert 221: long lcnt = 0;
222: FILE *infp;
1.1 deraadt 223:
1.4 millert 224: /* Stick a stream on top of input file descriptor */
225: if ((infp = fdopen(ifd, "r")) == NULL)
1.21 ! millert 226: err(1, "fdopen");
1.4 millert 227:
228: /* Process input one line at a time */
229: while (fgets(bfr, sizeof(bfr), infp) != NULL) {
230: const int len = strlen(bfr);
1.15 chl 231:
232: if (len == 0)
233: continue;
1.4 millert 234:
235: /* If line is too long to deal with, just write it out */
236: if (bfr[len - 1] != '\n')
237: goto writeit;
238:
239: /* Check if we need to start a new file */
240: if (pflag) {
241: regmatch_t pmatch;
242:
243: pmatch.rm_so = 0;
244: pmatch.rm_eo = len - 1;
245: if (regexec(&rgx, bfr, 0, &pmatch, REG_STARTEND) == 0)
1.1 deraadt 246: newfile();
1.4 millert 247: } else if (lcnt++ == numlines) {
248: newfile();
249: lcnt = 1;
1.1 deraadt 250: }
1.4 millert 251:
252: writeit:
253: /* Open output file if needed */
254: if (!file_open)
255: newfile();
256:
257: /* Write out line */
258: if (write(ofd, bfr, len) != len)
1.21 ! millert 259: err(1, "write");
1.4 millert 260: }
261:
262: /* EOF or error? */
263: if (ferror(infp))
1.21 ! millert 264: err(1, "read");
1.4 millert 265: else
266: exit(0);
1.1 deraadt 267: }
268:
269: /*
270: * newfile --
271: * Open a new output file.
272: */
273: void
1.9 deraadt 274: newfile(void)
1.1 deraadt 275: {
1.12 millert 276: static char *suffix, *sufftail;
1.14 millert 277: char *sptr;
1.1 deraadt 278:
279: if (ofd == -1) {
1.14 millert 280: ofd = fileno(stdout);
281: if (*fname == '\0') {
282: *fname = 'x'; /* no name specified, use 'x' */
283: memset(fname + 1, 'a', sufflen);
284: suffix = fname;
285: sufflen++; /* treat 'x' as part of suffix */
1.1 deraadt 286: } else {
1.12 millert 287: suffix = fname + strlen(fname);
1.14 millert 288: memset(suffix, 'a', sufflen);
1.1 deraadt 289: }
1.12 millert 290: suffix[sufflen] = '\0';
291: sufftail = suffix + sufflen - 1;
1.14 millert 292: } else {
293: for (sptr = sufftail; sptr >= suffix; sptr--) {
294: if (*sptr != 'z') {
295: (*sptr)++;
1.12 millert 296: break;
1.14 millert 297: } else
298: *sptr = 'a';
1.12 millert 299: }
1.14 millert 300: if (sptr < suffix)
1.21 ! millert 301: errx(1, "too many files");
1.14 millert 302: }
1.12 millert 303:
1.1 deraadt 304: if (!freopen(fname, "w", stdout))
1.21 ! millert 305: err(1, "%s", fname);
1.4 millert 306: file_open = 1;
1.1 deraadt 307: }
308:
1.13 millert 309: __dead void
1.9 deraadt 310: usage(void)
1.1 deraadt 311: {
1.4 millert 312: extern char *__progname;
313:
1.16 sobrado 314: (void)fprintf(stderr, "usage: %s [-a suffix_length]\n"
315: " [-b byte_count[k|m] | -l line_count | -p pattern] "
316: "[file [name]]\n", __progname);
1.21 ! millert 317: exit(1);
1.1 deraadt 318: }
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