Import NetBSD sed

third_party/sed/main.c

@@ -0,0 +1,559 @@
+/*	$NetBSD: main.c,v 1.36 2020/05/15 22:39:54 christos Exp $	*/
+
+/*-
+ * Copyright (c) 2013 Johann 'Myrkraverk' Oskarsson.
+ * Copyright (c) 1992 Diomidis Spinellis.
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by
+ * Diomidis Spinellis of Imperial College, University of London.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if HAVE_NBTOOL_CONFIG_H
+#include "nbtool_config.h"
+#endif
+
+#include <sys/cdefs.h>
+__RCSID("$NetBSD: main.c,v 1.36 2020/05/15 22:39:54 christos Exp $");
+#ifdef __FBSDID
+__FBSDID("$FreeBSD: head/usr.bin/sed/main.c 252231 2013-06-26 04:14:19Z pfg $");
+#endif
+
+#ifndef lint
+__COPYRIGHT("@(#) Copyright (c) 1992, 1993\
+	The Regents of the University of California.  All rights reserved.");
+#endif
+
+#if 0
+static const char sccsid[] = "@(#)main.c	8.2 (Berkeley) 1/3/94";
+#endif
+
+#include <sys/types.h>
+#include <sys/mman.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+
+#include <err.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <libgen.h>
+#include <limits.h>
+#include <locale.h>
+#include <regex.h>
+#include <stddef.h>
+#define _WITH_GETLINE
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "defs.h"
+#include "extern.h"
+
+/*
+ * Linked list of units (strings and files) to be compiled
+ */
+struct s_compunit {
+	struct s_compunit *next;
+	enum e_cut {CU_FILE, CU_STRING} type;
+	char *s;			/* Pointer to string or fname */
+};
+
+/*
+ * Linked list pointer to compilation units and pointer to current
+ * next pointer.
+ */
+static struct s_compunit *script, **cu_nextp = &script;
+
+/*
+ * Linked list of files to be processed
+ */
+struct s_flist {
+	char *fname;
+	struct s_flist *next;
+};
+
+/*
+ * Linked list pointer to files and pointer to current
+ * next pointer.
+ */
+static struct s_flist *files, **fl_nextp = &files;
+
+FILE *infile;			/* Current input file */
+FILE *outfile;			/* Current output file */
+
+int aflag, eflag, nflag;
+int rflags = 0;
+static int rval;		/* Exit status */
+
+static int ispan;		/* Whether inplace editing spans across files */
+
+/*
+ * Current file and line number; line numbers restart across compilation
+ * units, but span across input files.  The latter is optional if editing
+ * in place.
+ */
+const char *fname;		/* File name. */
+const char *outfname;		/* Output file name */
+static char oldfname[PATH_MAX];	/* Old file name (for in-place editing) */
+static char tmpfname[PATH_MAX];	/* Temporary file name (for in-place editing) */
+static const char *inplace;	/* Inplace edit file extension. */
+u_long linenum;
+
+static void add_compunit(enum e_cut, char *);
+static void add_file(char *);
+static void usage(void) __dead;
+
+int
+main(int argc, char *argv[])
+{
+	int c, fflag;
+	char *temp_arg;
+
+	setprogname(argv[0]);
+	(void) setlocale(LC_ALL, "");
+
+	fflag = 0;
+	inplace = NULL;
+
+	while ((c = getopt(argc, argv, "EI::ae:f:i::lnru")) != -1)
+		switch (c) {
+		case 'r':		/* Gnu sed compat */
+		case 'E':
+			rflags = REG_EXTENDED;
+			break;
+		case 'I':
+			inplace = optarg ? optarg : __UNCONST("");
+			ispan = 1;	/* span across input files */
+			break;
+		case 'a':
+			aflag = 1;
+			break;
+		case 'e':
+			eflag = 1;
+			temp_arg = xmalloc(strlen(optarg) + 2);
+			strcpy(temp_arg, optarg);
+			strcat(temp_arg, "\n");
+			add_compunit(CU_STRING, temp_arg);
+			break;
+		case 'f':
+			fflag = 1;
+			add_compunit(CU_FILE, optarg);
+			break;
+		case 'i':
+			inplace = optarg ? optarg : __UNCONST("");
+			ispan = 0;	/* don't span across input files */
+			break;
+		case 'l':
+#ifdef _IOLBF
+			c = setvbuf(stdout, NULL, _IOLBF, 0);
+#else
+			c = setlinebuf(stdout);
+#endif
+			if (c)
+				warn("setting line buffered output failed");
+			break;
+		case 'n':
+			nflag = 1;
+			break;
+		case 'u':
+#ifdef _IONBF
+			c = setvbuf(stdout, NULL, _IONBF, 0);
+#else
+			c = -1;
+			errno = EOPNOTSUPP;
+#endif
+			if (c)
+				warn("setting unbuffered output failed");
+			break;
+		default:
+		case '?':
+			usage();
+		}
+	argc -= optind;
+	argv += optind;
+
+	/* First usage case; script is the first arg */
+	if (!eflag && !fflag && *argv) {
+		add_compunit(CU_STRING, *argv);
+		argv++;
+	}
+
+	compile();
+
+	/* Continue with first and start second usage */
+	if (*argv)
+		for (; *argv; argv++)
+			add_file(*argv);
+	else
+		add_file(NULL);
+	process();
+	cfclose(prog, NULL);
+	if (fclose(stdout))
+		err(1, "stdout");
+	exit(rval);
+}
+
+static void
+usage(void)
+{
+	(void)fprintf(stderr,
+	    "Usage:  %s [-aElnru] command [file ...]\n"
+	    "\t%s [-aElnru] [-e command] [-f command_file] [-I[extension]]\n"
+	    "\t    [-i[extension]] [file ...]\n", getprogname(), getprogname());
+	exit(1);
+}
+
+/*
+ * Like fgets, but go through the chain of compilation units chaining them
+ * together.  Empty strings and files are ignored.
+ */
+char *
+cu_fgets(char *buf, int n, int *more)
+{
+	static enum {ST_EOF, ST_FILE, ST_STRING} state = ST_EOF;
+	static FILE *f;		/* Current open file */
+	static char *s;		/* Current pointer inside string */
+	static char string_ident[30];
+	char *p;
+
+again:
+	switch (state) {
+	case ST_EOF:
+		if (script == NULL) {
+			if (more != NULL)
+				*more = 0;
+			return (NULL);
+		}
+		linenum = 0;
+		switch (script->type) {
+		case CU_FILE:
+			if ((f = fopen(script->s, "r")) == NULL)
+				err(1, "%s", script->s);
+			fname = script->s;
+			state = ST_FILE;
+			goto again;
+		case CU_STRING:
+			if (((size_t)snprintf(string_ident,
+			    sizeof(string_ident), "\"%s\"", script->s)) >=
+			    sizeof(string_ident) - 1)
+				(void)strcpy(string_ident +
+				    sizeof(string_ident) - 6, " ...\"");
+			fname = string_ident;
+			s = script->s;
+			state = ST_STRING;
+			goto again;
+		default:
+			abort();
+		}
+	case ST_FILE:
+		if ((p = fgets(buf, n, f)) != NULL) {
+			linenum++;
+			if (linenum == 1 && buf[0] == '#' && buf[1] == 'n')
+				nflag = 1;
+			if (more != NULL)
+				*more = !feof(f);
+			return (p);
+		}
+		script = script->next;
+		(void)fclose(f);
+		state = ST_EOF;
+		goto again;
+	case ST_STRING:
+		if (linenum == 0 && s[0] == '#' && s[1] == 'n')
+			nflag = 1;
+		p = buf;
+		for (;;) {
+			if (n-- <= 1) {
+				*p = '\0';
+				linenum++;
+				if (more != NULL)
+					*more = 1;
+				return (buf);
+			}
+			switch (*s) {
+			case '\0':
+				state = ST_EOF;
+				if (s == script->s) {
+					script = script->next;
+					goto again;
+				} else {
+					script = script->next;
+					*p = '\0';
+					linenum++;
+					if (more != NULL)
+						*more = 0;
+					return (buf);
+				}
+			case '\n':
+				*p++ = '\n';
+				*p = '\0';
+				s++;
+				linenum++;
+				if (more != NULL)
+					*more = 0;
+				return (buf);
+			default:
+				*p++ = *s++;
+			}
+		}
+	}
+	/* NOTREACHED */
+	return (NULL);
+}
+
+/*
+ * Like fgets, but go through the list of files chaining them together.
+ * Set len to the length of the line.
+ */
+int
+mf_fgets(SPACE *sp, enum e_spflag spflag)
+{
+	struct stat sb;
+	size_t len;
+	static char *p = NULL;
+	static size_t plen = 0;
+	int c;
+	static int firstfile;
+
+	if (infile == NULL) {
+		/* stdin? */
+		if (files->fname == NULL) {
+			if (inplace != NULL)
+				errx(1, "-I or -i may not be used with stdin");
+			infile = stdin;
+			fname = "stdin";
+			outfile = stdout;
+			outfname = "stdout";
+		}
+		firstfile = 1;
+	}
+
+	for (;;) {
+		if (infile != NULL && (c = getc(infile)) != EOF) {
+			(void)ungetc(c, infile);
+			break;
+		}
+		/* If we are here then either eof or no files are open yet */
+		if (infile == stdin) {
+			sp->len = 0;
+			return (0);
+		}
+		if (infile != NULL) {
+			fclose(infile);
+			if (*oldfname != '\0') {
+				/* if there was a backup file, remove it */
+				unlink(oldfname);
+				/*
+				 * Backup the original.  Note that hard links
+				 * are not supported on all filesystems.
+				 */
+				if ((link(fname, oldfname) != 0) &&
+				   (rename(fname, oldfname) != 0)) {
+					warn("rename()");
+					if (*tmpfname)
+						unlink(tmpfname);
+					exit(1);
+				}
+				*oldfname = '\0';
+			}
+			if (*tmpfname != '\0') {
+				if (outfile != NULL && outfile != stdout)
+					if (fclose(outfile) != 0) {
+						warn("fclose()");
+						unlink(tmpfname);
+						exit(1);
+					}
+				outfile = NULL;
+				if (rename(tmpfname, fname) != 0) {
+					/* this should not happen really! */
+					warn("rename()");
+					unlink(tmpfname);
+					exit(1);
+				}
+				*tmpfname = '\0';
+			}
+			outfname = NULL;
+		}
+		if (firstfile == 0)
+			files = files->next;
+		else
+			firstfile = 0;
+		if (files == NULL) {
+			sp->len = 0;
+			return (0);
+		}
+		fname = files->fname;
+		if (inplace != NULL) {
+			if (lstat(fname, &sb) != 0)
+				err(1, "%s", fname);
+			if (!(sb.st_mode & S_IFREG))
+				errx(1, "%s: %s %s", fname,
+				    "in-place editing only",
+				    "works for regular files");
+			if (*inplace != '\0') {
+				strlcpy(oldfname, fname,
+				    sizeof(oldfname));
+				len = strlcat(oldfname, inplace,
+				    sizeof(oldfname));
+				if (len > sizeof(oldfname))
+					errx(1, "%s: name too long", fname);
+			}
+			char d_name[PATH_MAX], f_name[PATH_MAX];
+			(void)strlcpy(d_name, fname, sizeof(d_name));
+			(void)strlcpy(f_name, fname, sizeof(f_name));
+			len = (size_t)snprintf(tmpfname, sizeof(tmpfname),
+			    "%s/.!%ld!%s", dirname(d_name), (long)getpid(),
+			    basename(f_name));
+			if (len >= sizeof(tmpfname))
+				errx(1, "%s: name too long", fname);
+			unlink(tmpfname);
+			if (outfile != NULL && outfile != stdout)
+				fclose(outfile);
+			if ((outfile = fopen(tmpfname, "w")) == NULL)
+				err(1, "%s", fname);
+			fchown(fileno(outfile), sb.st_uid, sb.st_gid);
+			fchmod(fileno(outfile), sb.st_mode & ALLPERMS);
+			outfname = tmpfname;
+			if (!ispan) {
+				linenum = 0;
+				resetstate();
+			}
+		} else {
+			outfile = stdout;
+			outfname = "stdout";
+		}
+		if ((infile = fopen(fname, "r")) == NULL) {
+			warn("%s", fname);
+			rval = 1;
+			continue;
+		}
+	}
+	/*
+	 * We are here only when infile is open and we still have something
+	 * to read from it.
+	 *
+	 * Use getline() so that we can handle essentially infinite input
+	 * data.  The p and plen are static so each invocation gives
+	 * getline() the same buffer which is expanded as needed.
+	 */
+	ssize_t slen = getline(&p, &plen, infile);
+	if (slen == -1)
+		err(1, "%s", fname);
+	if (slen != 0 && p[slen - 1] == '\n') {
+		sp->append_newline = 1;
+		slen--;
+	} else if (!lastline()) {
+		sp->append_newline = 1;
+	} else {
+		sp->append_newline = 0;
+	}
+	cspace(sp, p, (size_t)slen, spflag);
+
+	linenum++;
+
+	return (1);
+}
+
+/*
+ * Add a compilation unit to the linked list
+ */
+static void
+add_compunit(enum e_cut type, char *s)
+{
+	struct s_compunit *cu;
+
+	cu = xmalloc(sizeof(struct s_compunit));
+	cu->type = type;
+	cu->s = s;
+	cu->next = NULL;
+	*cu_nextp = cu;
+	cu_nextp = &cu->next;
+}
+
+/*
+ * Add a file to the linked list
+ */
+static void
+add_file(char *s)
+{
+	struct s_flist *fp;
+
+	fp = xmalloc(sizeof(struct s_flist));
+	fp->next = NULL;
+	*fl_nextp = fp;
+	fp->fname = s;
+	fl_nextp = &fp->next;
+}
+
+static int
+next_files_have_lines(void)
+{
+	struct s_flist *file;
+	FILE *file_fd;
+	int ch;
+
+	file = files;
+	while ((file = file->next) != NULL) {
+		if ((file_fd = fopen(file->fname, "r")) == NULL)
+			continue;
+
+		if ((ch = getc(file_fd)) != EOF) {
+			/*
+			 * This next file has content, therefore current
+			 * file doesn't contains the last line.
+			 */
+			ungetc(ch, file_fd);
+			fclose(file_fd);
+			return (1);
+		}
+
+		fclose(file_fd);
+	}
+
+	return (0);
+}
+
+int
+lastline(void)
+{
+	int ch;
+
+	if (feof(infile)) {
+		return !(
+		    (inplace == NULL || ispan) &&
+		    next_files_have_lines());
+	}
+	if ((ch = getc(infile)) == EOF) {
+		return !(
+		    (inplace == NULL || ispan) &&
+		    next_files_have_lines());
+	}
+	ungetc(ch, infile);
+	return (0);
+}