/usr.bin/sed/main.c

  1/*-
  2 * Copyright (c) 1992 Diomidis Spinellis.
  3 * Copyright (c) 1992, 1993
  4 *	The Regents of the University of California.  All rights reserved.
  5 *
  6 * This code is derived from software contributed to Berkeley by
  7 * Diomidis Spinellis of Imperial College, University of London.
  8 *
  9 * Redistribution and use in source and binary forms, with or without
 10 * modification, are permitted provided that the following conditions
 11 * are met:
 12 * 1. Redistributions of source code must retain the above copyright
 13 *    notice, this list of conditions and the following disclaimer.
 14 * 2. Redistributions in binary form must reproduce the above copyright
 15 *    notice, this list of conditions and the following disclaimer in the
 16 *    documentation and/or other materials provided with the distribution.
 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#include <sys/cdefs.h>
 35__FBSDID("$FreeBSD$");
 36
 37#ifndef lint
 38static const char copyright[] =
 39"@(#) Copyright (c) 1992, 1993\n\
 40	The Regents of the University of California.  All rights reserved.\n";
 41#endif
 42
 43#ifndef lint
 44static const char sccsid[] = "@(#)main.c	8.2 (Berkeley) 1/3/94";
 45#endif
 46
 47#include <sys/types.h>
 48#include <sys/mman.h>
 49#include <sys/param.h>
 50#include <sys/stat.h>
 51
 52#include <err.h>
 53#include <errno.h>
 54#include <fcntl.h>
 55#include <libgen.h>
 56#include <limits.h>
 57#include <locale.h>
 58#include <regex.h>
 59#include <stddef.h>
 60#include <stdio.h>
 61#include <stdlib.h>
 62#include <string.h>
 63#include <unistd.h>
 64
 65#include "defs.h"
 66#include "extern.h"
 67
 68/*
 69 * Linked list of units (strings and files) to be compiled
 70 */
 71struct s_compunit {
 72	struct s_compunit *next;
 73	enum e_cut {CU_FILE, CU_STRING} type;
 74	char *s;			/* Pointer to string or fname */
 75};
 76
 77/*
 78 * Linked list pointer to compilation units and pointer to current
 79 * next pointer.
 80 */
 81static struct s_compunit *script, **cu_nextp = &script;
 82
 83/*
 84 * Linked list of files to be processed
 85 */
 86struct s_flist {
 87	char *fname;
 88	struct s_flist *next;
 89};
 90
 91/*
 92 * Linked list pointer to files and pointer to current
 93 * next pointer.
 94 */
 95static struct s_flist *files, **fl_nextp = &files;
 96
 97FILE *infile;			/* Current input file */
 98FILE *outfile;			/* Current output file */
 99
100int aflag, eflag, nflag;
101int rflags = 0;
102static int rval;		/* Exit status */
103
104static int ispan;		/* Whether inplace editing spans across files */
105
106/*
107 * Current file and line number; line numbers restart across compilation
108 * units, but span across input files.  The latter is optional if editing
109 * in place.
110 */
111const char *fname;		/* File name. */
112const char *outfname;		/* Output file name */
113static char oldfname[PATH_MAX];	/* Old file name (for in-place editing) */
114static char tmpfname[PATH_MAX];	/* Temporary file name (for in-place editing) */
115static const char *inplace;	/* Inplace edit file extension. */
116u_long linenum;
117
118static void add_compunit(enum e_cut, char *);
119static void add_file(char *);
120static void usage(void);
121
122int
123main(int argc, char *argv[])
124{
125	int c, fflag;
126	char *temp_arg;
127
128	(void) setlocale(LC_ALL, "");
129
130	fflag = 0;
131	inplace = NULL;
132
133	while ((c = getopt(argc, argv, "EI:ae:f:i:lnr")) != -1)
134		switch (c) {
135		case 'r':		/* Gnu sed compat */
136		case 'E':
137			rflags = REG_EXTENDED;
138			break;
139		case 'I':
140			inplace = optarg;
141			ispan = 1;	/* span across input files */
142			break;
143		case 'a':
144			aflag = 1;
145			break;
146		case 'e':
147			eflag = 1;
148			if ((temp_arg = malloc(strlen(optarg) + 2)) == NULL)
149				err(1, "malloc");
150			strcpy(temp_arg, optarg);
151			strcat(temp_arg, "\n");
152			add_compunit(CU_STRING, temp_arg);
153			break;
154		case 'f':
155			fflag = 1;
156			add_compunit(CU_FILE, optarg);
157			break;
158		case 'i':
159			inplace = optarg;
160			ispan = 0;	/* don't span across input files */
161			break;
162		case 'l':
163			if(setlinebuf(stdout) != 0)
164				warnx("setlinebuf() failed");
165			break;
166		case 'n':
167			nflag = 1;
168			break;
169		default:
170		case '?':
171			usage();
172		}
173	argc -= optind;
174	argv += optind;
175
176	/* First usage case; script is the first arg */
177	if (!eflag && !fflag && *argv) {
178		add_compunit(CU_STRING, *argv);
179		argv++;
180	}
181
182	compile();
183
184	/* Continue with first and start second usage */
185	if (*argv)
186		for (; *argv; argv++)
187			add_file(*argv);
188	else
189		add_file(NULL);
190	process();
191	cfclose(prog, NULL);
192	if (fclose(stdout))
193		err(1, "stdout");
194	exit(rval);
195}
196
197static void
198usage(void)
199{
200	(void)fprintf(stderr, "%s\n%s\n",
201		"usage: sed script [-Ealn] [-i extension] [file ...]",
202		"       sed [-Ealn] [-i extension] [-e script] ... [-f script_file] ... [file ...]");
203	exit(1);
204}
205
206/*
207 * Like fgets, but go through the chain of compilation units chaining them
208 * together.  Empty strings and files are ignored.
209 */
210char *
211cu_fgets(char *buf, int n, int *more)
212{
213	static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
214	static FILE *f;		/* Current open file */
215	static char *s;		/* Current pointer inside string */
216	static char string_ident[30];
217	char *p;
218
219again:
220	switch (state) {
221	case ST_EOF:
222		if (script == NULL) {
223			if (more != NULL)
224				*more = 0;
225			return (NULL);
226		}
227		linenum = 0;
228		switch (script->type) {
229		case CU_FILE:
230			if ((f = fopen(script->s, "r")) == NULL)
231				err(1, "%s", script->s);
232			fname = script->s;
233			state = ST_FILE;
234			goto again;
235		case CU_STRING:
236			if (((size_t)snprintf(string_ident,
237			    sizeof(string_ident), "\"%s\"", script->s)) >=
238			    sizeof(string_ident) - 1)
239				(void)strcpy(string_ident +
240				    sizeof(string_ident) - 6, " ...\"");
241			fname = string_ident;
242			s = script->s;
243			state = ST_STRING;
244			goto again;
245		}
246	case ST_FILE:
247		if ((p = fgets(buf, n, f)) != NULL) {
248			linenum++;
249			if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
250				nflag = 1;
251			if (more != NULL)
252				*more = !feof(f);
253			return (p);
254		}
255		script = script->next;
256		(void)fclose(f);
257		state = ST_EOF;
258		goto again;
259	case ST_STRING:
260		if (linenum == 0 && s[0] == '#' && s[1] == 'n')
261			nflag = 1;
262		p = buf;
263		for (;;) {
264			if (n-- <= 1) {
265				*p = '\0';
266				linenum++;
267				if (more != NULL)
268					*more = 1;
269				return (buf);
270			}
271			switch (*s) {
272			case '\0':
273				state = ST_EOF;
274				if (s == script->s) {
275					script = script->next;
276					goto again;
277				} else {
278					script = script->next;
279					*p = '\0';
280					linenum++;
281					if (more != NULL)
282						*more = 0;
283					return (buf);
284				}
285			case '\n':
286				*p++ = '\n';
287				*p = '\0';
288				s++;
289				linenum++;
290				if (more != NULL)
291					*more = 0;
292				return (buf);
293			default:
294				*p++ = *s++;
295			}
296		}
297	}
298	/* NOTREACHED */
299	return (NULL);
300}
301
302/*
303 * Like fgets, but go through the list of files chaining them together.
304 * Set len to the length of the line.
305 */
306int
307mf_fgets(SPACE *sp, enum e_spflag spflag)
308{
309	struct stat sb;
310	size_t len;
311	char *p;
312	int c;
313	static int firstfile;
314
315	if (infile == NULL) {
316		/* stdin? */
317		if (files->fname == NULL) {
318			if (inplace != NULL)
319				errx(1, "-I or -i may not be used with stdin");
320			infile = stdin;
321			fname = "stdin";
322			outfile = stdout;
323			outfname = "stdout";
324		}
325		firstfile = 1;
326	}
327
328	for (;;) {
329		if (infile != NULL && (c = getc(infile)) != EOF) {
330			(void)ungetc(c, infile);
331			break;
332		}
333		/* If we are here then either eof or no files are open yet */
334		if (infile == stdin) {
335			sp->len = 0;
336			return (0);
337		}
338		if (infile != NULL) {
339			fclose(infile);
340			if (*oldfname != '\0') {
341				/* if there was a backup file, remove it */
342				unlink(oldfname);
343				/*
344				 * Backup the original.  Note that hard links
345				 * are not supported on all filesystems.
346				 */
347				if ((link(fname, oldfname) != 0) &&
348				   (rename(fname, oldfname) != 0)) {
349					warn("rename()");
350					if (*tmpfname)
351						unlink(tmpfname);
352					exit(1);
353				}
354				*oldfname = '\0';
355			}
356			if (*tmpfname != '\0') {
357				if (outfile != NULL && outfile != stdout)
358					if (fclose(outfile) != 0) {
359						warn("fclose()");
360						unlink(tmpfname);
361						exit(1);
362					}
363				outfile = NULL;
364				if (rename(tmpfname, fname) != 0) {
365					/* this should not happen really! */
366					warn("rename()");
367					unlink(tmpfname);
368					exit(1);
369				}
370				*tmpfname = '\0';
371			}
372			outfname = NULL;
373		}
374		if (firstfile == 0)
375			files = files->next;
376		else
377			firstfile = 0;
378		if (files == NULL) {
379			sp->len = 0;
380			return (0);
381		}
382		fname = files->fname;
383		if (inplace != NULL) {
384			if (lstat(fname, &sb) != 0)
385				err(1, "%s", fname);
386			if (!(sb.st_mode & S_IFREG))
387				errx(1, "%s: %s %s", fname,
388				    "in-place editing only",
389				    "works for regular files");
390			if (*inplace != '\0') {
391				strlcpy(oldfname, fname,
392				    sizeof(oldfname));
393				len = strlcat(oldfname, inplace,
394				    sizeof(oldfname));
395				if (len > sizeof(oldfname))
396					errx(1, "%s: name too long", fname);
397			}
398			len = snprintf(tmpfname, sizeof(tmpfname),
399			    "%s/.!%ld!%s", dirname(fname), (long)getpid(),
400			    basename(fname));
401			if (len >= sizeof(tmpfname))
402				errx(1, "%s: name too long", fname);
403			unlink(tmpfname);
404			if ((outfile = fopen(tmpfname, "w")) == NULL)
405				err(1, "%s", fname);
406			fchown(fileno(outfile), sb.st_uid, sb.st_gid);
407			fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
408			outfname = tmpfname;
409			if (!ispan) {
410				linenum = 0;
411				resetstate();
412			}
413		} else {
414			outfile = stdout;
415			outfname = "stdout";
416		}
417		if ((infile = fopen(fname, "r")) == NULL) {
418			warn("%s", fname);
419			rval = 1;
420			continue;
421		}
422	}
423	/*
424	 * We are here only when infile is open and we still have something
425	 * to read from it.
426	 *
427	 * Use fgetln so that we can handle essentially infinite input data.
428	 * Can't use the pointer into the stdio buffer as the process space
429	 * because the ungetc() can cause it to move.
430	 */
431	p = fgetln(infile, &len);
432	if (ferror(infile))
433		errx(1, "%s: %s", fname, strerror(errno ? errno : EIO));
434	if (len != 0 && p[len - 1] == '\n')
435		len--;
436	cspace(sp, p, len, spflag);
437
438	linenum++;
439
440	return (1);
441}
442
443/*
444 * Add a compilation unit to the linked list
445 */
446static void
447add_compunit(enum e_cut type, char *s)
448{
449	struct s_compunit *cu;
450
451	if ((cu = malloc(sizeof(struct s_compunit))) == NULL)
452		err(1, "malloc");
453	cu->type = type;
454	cu->s = s;
455	cu->next = NULL;
456	*cu_nextp = cu;
457	cu_nextp = &cu->next;
458}
459
460/*
461 * Add a file to the linked list
462 */
463static void
464add_file(char *s)
465{
466	struct s_flist *fp;
467
468	if ((fp = malloc(sizeof(struct s_flist))) == NULL)
469		err(1, "malloc");
470	fp->next = NULL;
471	*fl_nextp = fp;
472	fp->fname = s;
473	fl_nextp = &fp->next;
474}
475
476int
477lastline(void)
478{
479	int ch;
480
481	if (files->next != NULL && (inplace == NULL || ispan))
482		return (0);
483	if ((ch = getc(infile)) == EOF)
484		return (1);
485	ungetc(ch, infile);
486	return (0);
487}