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1.4 ! fgsch 1: /* $OpenBSD: csplit.c,v 1.3 2006/07/17 22:28:11 deraadt Exp $ */
1.1 millert 2: /* $FreeBSD: src/usr.bin/csplit/csplit.c,v 1.9 2004/03/22 11:15:03 tjr Exp $ */
3:
4: /*-
5: * Copyright (c) 2002 Tim J. Robbins.
6: * 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.
16: *
17: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20: * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27: * SUCH DAMAGE.
28: */
29:
30: /*
31: * csplit -- split files based on context
32: *
33: * This utility splits its input into numbered output files by line number
34: * or by a regular expression. Regular expression matches have an optional
35: * offset with them, allowing the split to occur a specified number of
36: * lines before or after the match.
37: *
38: * To handle negative offsets, we stop reading when the match occurs and
39: * store the offset that the file should have been split at, then use
40: * this output file as input until all the "overflowed" lines have been read.
41: * The file is then closed and truncated to the correct length.
42: *
43: * We assume that the output files can be seeked upon (ie. they cannot be
44: * symlinks to named pipes or character devices), but make no such
45: * assumption about the input.
46: */
47:
48: #include <sys/types.h>
49:
50: #include <ctype.h>
51: #include <err.h>
52: #include <errno.h>
53: #include <limits.h>
54: #include <locale.h>
55: #include <regex.h>
56: #include <signal.h>
57: #include <stdint.h>
58: #include <stdio.h>
59: #include <stdlib.h>
60: #include <string.h>
61: #include <unistd.h>
62:
63: void cleanup(void);
64: void do_lineno(const char *);
65: void do_rexp(const char *);
1.4 ! fgsch 66: char *get_line(void);
1.1 millert 67: void handlesig(int);
68: FILE *newfile(void);
69: void toomuch(FILE *, long);
70: void usage(void);
71:
72: /*
73: * Command line options
74: */
75: const char *prefix; /* File name prefix */
76: long sufflen; /* Number of decimal digits for suffix */
77: int sflag; /* Suppress output of file names */
78: int kflag; /* Keep output if error occurs */
79:
80: /*
81: * Other miscellaneous globals (XXX too many)
82: */
83: long lineno; /* Current line number in input file */
84: long reps; /* Number of repetitions for this pattern */
85: long nfiles; /* Number of files output so far */
86: long maxfiles; /* Maximum number of files we can create */
87: char currfile[PATH_MAX]; /* Current output file */
88: const char *infn; /* Name of the input file */
89: FILE *infile; /* Input file handle */
90: FILE *overfile; /* Overflow file for toomuch() */
91: off_t truncofs; /* Offset this file should be truncated at */
92: int doclean; /* Should cleanup() remove output? */
93:
94: int
95: main(int argc, char *argv[])
96: {
97: struct sigaction sa;
98: long i;
99: int ch;
100: const char *expr;
101: char *ep, *p;
102: FILE *ofp;
103:
104: setlocale(LC_ALL, "");
105:
106: kflag = sflag = 0;
107: prefix = "xx";
108: sufflen = 2;
109: while ((ch = getopt(argc, argv, "f:kn:s")) != -1) {
110: switch (ch) {
111: case 'f':
112: prefix = optarg;
113: break;
114: case 'k':
115: kflag = 1;
116: break;
117: case 'n':
118: errno = 0;
119: sufflen = strtol(optarg, &ep, 10);
120: if (sufflen <= 0 || *ep != '\0' || errno != 0)
121: errx(1, "%s: bad suffix length", optarg);
122: break;
123: case 's':
124: sflag = 1;
125: break;
126: default:
127: usage();
128: /*NOTREACHED*/
129: }
130: }
131:
132: if (sufflen + strlen(prefix) >= PATH_MAX)
133: errx(1, "name too long");
134:
135: argc -= optind;
136: argv += optind;
137:
138: if ((infn = *argv++) == NULL)
139: usage();
140: if (strcmp(infn, "-") == 0) {
141: infile = stdin;
142: infn = "stdin";
143: } else if ((infile = fopen(infn, "r")) == NULL)
144: err(1, "%s", infn);
145:
146: if (!kflag) {
147: doclean = 1;
148: atexit(cleanup);
149: sa.sa_flags = 0;
150: sa.sa_handler = handlesig;
151: sigemptyset(&sa.sa_mask);
152: sigaddset(&sa.sa_mask, SIGHUP);
153: sigaddset(&sa.sa_mask, SIGINT);
154: sigaddset(&sa.sa_mask, SIGTERM);
155: sigaction(SIGHUP, &sa, NULL);
156: sigaction(SIGINT, &sa, NULL);
157: sigaction(SIGTERM, &sa, NULL);
158: }
159:
160: lineno = 0;
161: nfiles = 0;
162: truncofs = 0;
163: overfile = NULL;
164:
165: /* Ensure 10^sufflen < LONG_MAX. */
166: for (maxfiles = 1, i = 0; i < sufflen; i++) {
167: if (maxfiles > LONG_MAX / 10)
168: errx(1, "%ld: suffix too long (limit %ld)",
169: sufflen, i);
170: maxfiles *= 10;
171: }
172:
173: /* Create files based on supplied patterns. */
174: while (nfiles < maxfiles - 1 && (expr = *argv++) != NULL) {
175: /* Look ahead & see if this pattern has any repetitions. */
176: if (*argv != NULL && **argv == '{') {
177: errno = 0;
178: reps = strtol(*argv + 1, &ep, 10);
179: if (reps < 0 || *ep != '}' || errno != 0)
180: errx(1, "%s: bad repetition count", *argv + 1);
181: argv++;
182: } else
183: reps = 0;
184:
185: if (*expr == '/' || *expr == '%') {
186: do {
187: do_rexp(expr);
188: } while (reps-- != 0 && nfiles < maxfiles - 1);
189: } else if (isdigit((unsigned char)*expr))
190: do_lineno(expr);
191: else
192: errx(1, "%s: unrecognised pattern", expr);
193: }
194:
195: /* Copy the rest into a new file. */
196: if (!feof(infile)) {
197: ofp = newfile();
1.4 ! fgsch 198: while ((p = get_line()) != NULL && fputs(p, ofp) == 0)
1.1 millert 199: ;
200: if (!sflag)
201: printf("%jd\n", (intmax_t)ftello(ofp));
202: if (fclose(ofp) != 0)
203: err(1, "%s", currfile);
204: }
205:
206: toomuch(NULL, 0);
207: doclean = 0;
208:
209: return (0);
210: }
211:
212: void
213: usage(void)
214: {
215: extern char *__progname;
216:
217: fprintf(stderr,
218: "usage: %s [-ks] [-f prefix] [-n number] file args ...\n",
219: __progname);
220: exit(1);
221: }
222:
1.3 deraadt 223: /* ARGSUSED */
1.1 millert 224: void
225: handlesig(int sig)
226: {
227: const char msg[] = "csplit: caught signal, cleaning up\n";
228:
229: write(STDERR_FILENO, msg, sizeof(msg) - 1);
230: cleanup();
231: _exit(2);
232: }
233:
234: /* Create a new output file. */
235: FILE *
236: newfile(void)
237: {
238: FILE *fp;
239:
240: if ((size_t)snprintf(currfile, sizeof(currfile), "%s%0*ld", prefix,
241: (int)sufflen, nfiles) >= sizeof(currfile))
242: errx(1, "%s: %s", currfile, strerror(ENAMETOOLONG));
243: if ((fp = fopen(currfile, "w+")) == NULL)
244: err(1, "%s", currfile);
245: nfiles++;
246:
247: return (fp);
248: }
249:
250: /* Remove partial output, called before exiting. */
251: void
252: cleanup(void)
253: {
254: char fnbuf[PATH_MAX];
255: long i;
256:
257: if (!doclean)
258: return;
259:
260: /*
1.2 millert 261: * NOTE: One cannot portably assume to be able to call snprintf() from
262: * inside a signal handler. It is, however, safe to do on OpenBSD.
1.1 millert 263: */
264: for (i = 0; i < nfiles; i++) {
265: snprintf(fnbuf, sizeof(fnbuf), "%s%0*ld", prefix,
266: (int)sufflen, i);
267: unlink(fnbuf);
268: }
269: }
270:
271: /* Read a line from the input into a static buffer. */
272: char *
1.4 ! fgsch 273: get_line(void)
1.1 millert 274: {
275: static char lbuf[LINE_MAX];
276: FILE *src;
277:
278: src = overfile != NULL ? overfile : infile;
279:
280: again: if (fgets(lbuf, sizeof(lbuf), src) == NULL) {
281: if (src == overfile) {
282: src = infile;
283: goto again;
284: }
285: return (NULL);
286: }
287: if (ferror(src))
288: err(1, "%s", infn);
289: lineno++;
290:
291: return (lbuf);
292: }
293:
1.4 ! fgsch 294: /* Conceptually rewind the input (as obtained by get_line()) back `n' lines. */
1.1 millert 295: void
296: toomuch(FILE *ofp, long n)
297: {
298: char buf[BUFSIZ];
299: size_t i, nread;
300:
301: if (overfile != NULL) {
302: /*
303: * Truncate the previous file we overflowed into back to
304: * the correct length, close it.
305: */
306: if (fflush(overfile) != 0)
307: err(1, "overflow");
308: if (ftruncate(fileno(overfile), truncofs) != 0)
309: err(1, "overflow");
310: if (fclose(overfile) != 0)
311: err(1, "overflow");
312: overfile = NULL;
313: }
314:
315: if (n == 0)
316: /* Just tidying up */
317: return;
318:
319: lineno -= n;
320:
321: /*
322: * Wind the overflow file backwards to `n' lines before the
323: * current one.
324: */
325: do {
326: if (ftello(ofp) < (off_t)sizeof(buf))
327: rewind(ofp);
328: else
329: fseeko(ofp, -(off_t)sizeof(buf), SEEK_CUR);
330: if (ferror(ofp))
331: errx(1, "%s: can't seek", currfile);
332: if ((nread = fread(buf, 1, sizeof(buf), ofp)) == 0)
333: errx(1, "can't read overflowed output");
334: if (fseeko(ofp, -(off_t)nread, SEEK_CUR) != 0)
335: err(1, "%s", currfile);
336: for (i = 1; i <= nread; i++)
337: if (buf[nread - i] == '\n' && n-- == 0)
338: break;
339: if (ftello(ofp) == 0)
340: break;
341: } while (n > 0);
342: if (fseeko(ofp, (off_t)(nread - i + 1), SEEK_CUR) != 0)
343: err(1, "%s", currfile);
344:
345: /*
1.4 ! fgsch 346: * get_line() will read from here. Next call will truncate to
1.1 millert 347: * truncofs in this file.
348: */
349: overfile = ofp;
350: truncofs = ftello(overfile);
351: }
352:
353: /* Handle splits for /regexp/ and %regexp% patterns. */
354: void
355: do_rexp(const char *expr)
356: {
357: regex_t cre;
358: intmax_t nwritten;
359: long ofs;
360: int first;
361: char *ecopy, *ep, *p, *pofs, *re;
362: FILE *ofp;
363:
364: if ((ecopy = strdup(expr)) == NULL)
365: err(1, "strdup");
366:
367: re = ecopy + 1;
368: if ((pofs = strrchr(ecopy, *expr)) == NULL || pofs[-1] == '\\')
369: errx(1, "%s: missing trailing %c", expr, *expr);
370: *pofs++ = '\0';
371:
372: if (*pofs != '\0') {
373: errno = 0;
374: ofs = strtol(pofs, &ep, 10);
375: if (*ep != '\0' || errno != 0)
376: errx(1, "%s: bad offset", pofs);
377: } else
378: ofs = 0;
379:
380: if (regcomp(&cre, re, REG_BASIC|REG_NOSUB) != 0)
381: errx(1, "%s: bad regular expression", re);
382:
383: if (*expr == '/')
384: /* /regexp/: Save results to a file. */
385: ofp = newfile();
386: else {
387: /* %regexp%: Make a temporary file for overflow. */
388: if ((ofp = tmpfile()) == NULL)
389: err(1, "tmpfile");
390: }
391:
392: /* Read and output lines until we get a match. */
393: first = 1;
1.4 ! fgsch 394: while ((p = get_line()) != NULL) {
1.1 millert 395: if (fputs(p, ofp) != 0)
396: break;
397: if (!first && regexec(&cre, p, 0, NULL, 0) == 0)
398: break;
399: first = 0;
400: }
401:
402: if (p == NULL)
403: errx(1, "%s: no match", re);
404:
405: if (ofs <= 0) {
406: /*
407: * Negative (or zero) offset: throw back any lines we should
408: * not have read yet.
409: */
410: if (p != NULL) {
411: toomuch(ofp, -ofs + 1);
412: nwritten = (intmax_t)truncofs;
413: } else
414: nwritten = (intmax_t)ftello(ofp);
415: } else {
416: /*
417: * Positive offset: copy the requested number of lines
418: * after the match.
419: */
1.4 ! fgsch 420: while (--ofs > 0 && (p = get_line()) != NULL)
1.1 millert 421: fputs(p, ofp);
422: toomuch(NULL, 0);
423: nwritten = (intmax_t)ftello(ofp);
424: if (fclose(ofp) != 0)
425: err(1, "%s", currfile);
426: }
427:
428: if (!sflag && *expr == '/')
429: printf("%jd\n", nwritten);
430:
431: regfree(&cre);
432: free(ecopy);
433: }
434:
435: /* Handle splits based on line number. */
436: void
437: do_lineno(const char *expr)
438: {
439: long lastline, tgtline;
440: char *ep, *p;
441: FILE *ofp;
442:
443: errno = 0;
444: tgtline = strtol(expr, &ep, 10);
445: if (tgtline <= 0 || errno != 0 || *ep != '\0')
446: errx(1, "%s: bad line number", expr);
447: lastline = tgtline;
448: if (lastline <= lineno)
449: errx(1, "%s: can't go backwards", expr);
450:
451: while (nfiles < maxfiles - 1) {
452: ofp = newfile();
453: while (lineno + 1 != lastline) {
1.4 ! fgsch 454: if ((p = get_line()) == NULL)
1.1 millert 455: errx(1, "%ld: out of range", lastline);
456: if (fputs(p, ofp) != 0)
457: break;
458: }
459: if (!sflag)
460: printf("%jd\n", (intmax_t)ftello(ofp));
461: if (fclose(ofp) != 0)
462: err(1, "%s", currfile);
463: if (reps-- == 0)
464: break;
465: lastline += tgtline;
466: }
467: }