 @@ -1,491 +1,516 @@
 /*
  * $OpenBSD: inp.c,v 1.34 2006/03/11 19:41:30 otto Exp $
  * $DragonFly: src/usr.bin/patch/inp.c,v 1.6 2007/09/29 23:11:10 swildner Exp $
- * $NetBSD: inp.c,v 1.23 2009/10/21 17:16:11 joerg Exp $
+ * $NetBSD: inp.c,v 1.24 2015/07/24 18:56:00 christos Exp $
  */
 /*
  * patch - a program to apply diffs to original files
+ *
  * Copyright 1986, Larry Wall
+ *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following condition is met:
  * 1. Redistributions of source code must retain the above copyright notice,
  * this condition and the following disclaimer.
+ *
  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
+ *
  * -C option added in 1998, original code by Marc Espie, based on FreeBSD
  * behaviour
  */
 #include <sys/cdefs.h>
-__RCSID("$NetBSD: inp.c,v 1.23 2009/10/21 17:16:11 joerg Exp $");
+__RCSID("$NetBSD: inp.c,v 1.24 2015/07/24 18:56:00 christos Exp $");
 #include <sys/types.h>
 #include <sys/file.h>
 #include <sys/stat.h>
 #include <sys/mman.h>
 #include <sys/wait.h>
 #include <ctype.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <libgen.h>
 #include <limits.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 #include "common.h"
 #include "util.h"
 #include "pch.h"
 #include "inp.h"
 /* Input-file-with-indexable-lines abstract type */
 static off_t	i_size;		/* size of the input file */
 static char	*i_womp;	/* plan a buffer for entire file */
 static char	**i_ptr;	/* pointers to lines in i_womp */
 static char	empty_line[] = { '\0' };
 static int	tifd = -1;	/* plan b virtual string array */
 static char	*tibuf[2];	/* plan b buffers */
 static LINENUM	tiline[2] = {-1, -1};	/* 1st line in each buffer */
 static LINENUM	lines_per_buf;	/* how many lines per buffer */
 static int	tireclen;	/* length of records in tmp file */
 static bool	rev_in_string(const char *);
 static bool	reallocate_lines(size_t *);
 /* returns false if insufficient memory */
 static bool	plan_a(const char *);
 static void	plan_b(const char *);
 /* New patch--prepare to edit another file. */
 void
 re_input(void)
+{
 	if (using_plan_a) {
 		i_size = 0;
 		free(i_ptr);
 		i_ptr = NULL;
 		if (i_womp != NULL) {
 			munmap(i_womp, i_size);
 			i_womp = NULL;
+		}
 	} else {
 		using_plan_a = true;	/* maybe the next one is smaller */
 		close(tifd);
 		tifd = -1;
 		free(tibuf[0]);
 		free(tibuf[1]);
 		tibuf[0] = tibuf[1] = NULL;
 		tiline[0] = tiline[1] = -1;
 		tireclen = 0;
+	}
+}
 /* Construct the line index, somehow or other. */
 void
 scan_input(const char *filename)
+{
 	if (!plan_a(filename))
 		plan_b(filename);
 	if (verbose) {
 		say("Patching file %s using Plan %s...\n", filename,
 		    (using_plan_a ? "A" : "B"));
+	}
+}
 static bool
 reallocate_lines(size_t *lines_allocated)
+{
 	char	**p;
 	size_t	new_size;
 	new_size = *lines_allocated * 3 / 2;
 	p = realloc(i_ptr, (new_size + 2) * sizeof(char *));
 	if (p == NULL) {	/* shucks, it was a near thing */
 		munmap(i_womp, i_size);
 		i_womp = NULL;
 		free(i_ptr);
 		i_ptr = NULL;
 		*lines_allocated = 0;
 		return false;
+	}
 	*lines_allocated = new_size;
 	i_ptr = p;
 	return true;
+}
 /* Try keeping everything in memory. */
 static bool
 plan_a(const char *filename)
+{
-	int		ifd, statfailed;
+	int		ifd, statfailed, devnull, pstat;
 	char		*p, *s, lbuf[MAXLINELEN];
 	struct stat	filestat;
 	off_t		i;
 	ptrdiff_t	sz;
 	size_t		iline, lines_allocated;
 	pid_t		pid;
 	char		*argp[4] = {NULL};
 #ifdef DEBUGGING
 	if (debug & 8)
 		return false;
 #endif
 	if (filename == NULL || *filename == '\0')
 		return false;
 	statfailed = stat(filename, &filestat);
 	if (statfailed && ok_to_create_file) {
 		if (verbose)
 			say("(Creating file %s...)\n", filename);
 		/*
 		 * in check_patch case, we still display `Creating file' even
 		 * though we're not. The rule is that -C should be as similar
 		 * to normal patch behavior as possible
 		 */
 		if (check_only)
 			return true;
 		makedirs(filename, true);
 		close(creat(filename, 0666));
 		statfailed = stat(filename, &filestat);
+	}
 	if (statfailed && check_only)
 		fatal("%s not found, -C mode, can't probe further\n", filename);
-	/* For nonexistent or read-only files, look for RCS or SCCS versions.  */
+	/* For nonexistent or read-only files, look for RCS versions.  */
 	if (statfailed ||
 	    /* No one can write to it.  */
 	    (filestat.st_mode & 0222) == 0 ||
 	    /* I can't write to it.  */
 	    ((filestat.st_mode & 0022) == 0 && filestat.st_uid != getuid())) {
-		const char	*cs = NULL, *filebase, *filedir;
+		char	*filebase, *filedir;
 		struct stat	cstat;
 		char *tmp_filename1, *tmp_filename2;
 		tmp_filename1 = strdup(filename);
 		tmp_filename2 = strdup(filename);
 		if (tmp_filename1 == NULL || tmp_filename2 == NULL)
 			fatal("strdupping filename");
 		filebase = basename(tmp_filename1);
-		filedir = dirname(tmp_filename2);
+ 		filebase = basename(tmp_filename1);
  		filedir = dirname(tmp_filename2);
 		/* Leave room in lbuf for the diff command.  */
 		s = lbuf + 20;
 #define try(f, a1, a2, a3) \
-	(snprintf(s, sizeof lbuf - 20, f, a1, a2, a3), stat(s, &cstat) == 0)
+	(snprintf(lbuf, sizeof lbuf, f, a1, a2, a3), stat(lbuf, &cstat) == 0)
 		if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) ||
 		    try("%s/RCS/%s%s", filedir, filebase, "") ||
 		    try("%s/%s%s", filedir, filebase, RCSSUFFIX)) {
 			snprintf(buf, buf_len, CHECKOUT, filename);
 			snprintf(lbuf, sizeof lbuf, RCSDIFF, filename);
 			cs = "RCS";
 		} else if (try("%s/SCCS/%s%s", filedir, SCCSPREFIX, filebase) ||
 		    try("%s/%s%s", filedir, SCCSPREFIX, filebase)) {
 			snprintf(buf, buf_len, GET, s);
 			snprintf(lbuf, sizeof lbuf, SCCSDIFF, s, filename);
 			cs = "SCCS";
 		} else if (statfailed)
 			fatal("can't find %s\n", filename);
 		free(tmp_filename1);
 		free(tmp_filename2);
 		/*
 		 * else we can't write to it but it's not under a version
 		 * control system, so just proceed.
 		 */
-		if (cs) {
+		if (try("%s/RCS/%s%s", filedir, filebase, RCSSUFFIX) ||
 		    try("%s/RCS/%s%s", filedir, filebase, "") ||
 		    try("%s/%s%s", filedir, filebase, RCSSUFFIX)) {
 			if (!statfailed) {
 				if ((filestat.st_mode & 0222) != 0)
 					/* The owner can write to it.  */
 					fatal("file %s seems to be locked "
-					    "by somebody else under %s\n",
+					    "by somebody else under RCS\n",
-					    filename, cs);
+					    filename);
 				/*
 				 * It might be checked out unlocked.  See if
 				 * it's safe to check out the default version
 				 * locked.
 				 */
 				if (verbose)
 					say("Comparing file %s to default "
-					    "%s version...\n",
+					    "RCS version...\n", filename);
 					    filename, cs);
-				if (system(lbuf))
+				switch (pid = fork()) {
 				case -1:
 					fatal("can't fork: %s\n",
 					    strerror(errno));
 				case 0:
 					devnull = open("/dev/null", O_RDONLY);
 					if (devnull == -1) {
 						fatal("can't open /dev/null: %s",
 						    strerror(errno));
+					}
 					(void)dup2(devnull, STDOUT_FILENO);
 					argp[0] = __UNCONST(RCSDIFF);
 					argp[1] = __UNCONST(filename);
 					execv(RCSDIFF, argp);
 					exit(127);
+				}
 				pid = waitpid(pid, &pstat, 0);
 				if (pid == -1 || WEXITSTATUS(pstat) != 0) {
 					fatal("can't check out file %s: "
-					    "differs from default %s version\n",
+					    "differs from default RCS version\n",
-					    filename, cs);
+					    filename);
+				}
+			}
 			if (verbose)
-				say("Checking out file %s from %s...\n",
+				say("Checking out file %s from RCS...\n",
-				    filename, cs);
+				    filename);
 			if (system(buf) || stat(filename, &filestat))
-				fatal("can't check out file %s from %s\n",
+			switch (pid = fork()) {
-				    filename, cs);
+			case -1:
 				fatal("can't fork: %s\n", strerror(errno));
 			case 0:
 				argp[0] = __UNCONST(CHECKOUT);
 				argp[1] = __UNCONST("-l");
 				argp[2] = __UNCONST(filename);
 				execv(CHECKOUT, argp);
 				exit(127);
+			}
 			pid = waitpid(pid, &pstat, 0);
 			if (pid == -1 || WEXITSTATUS(pstat) != 0 ||
 			    stat(filename, &filestat)) {
 				fatal("can't check out file %s from RCS\n",
 				    filename);
+			}
 		} else if (statfailed) {
 			fatal("can't find %s\n", filename);
+		}
 		free(tmp_filename1);
 		free(tmp_filename2);
+	}
 	filemode = filestat.st_mode;
 	if (!S_ISREG(filemode))
 		fatal("%s is not a normal file--can't patch\n", filename);
 	i_size = filestat.st_size;
 	if (out_of_mem) {
 		set_hunkmax();	/* make sure dynamic arrays are allocated */
 		out_of_mem = false;
 		return false;	/* force plan b because plan a bombed */
+	}
 	if ((uintmax_t)i_size > (uintmax_t)SIZE_MAX) {
 		say("block too large to mmap\n");
 		return false;
+	}
 	if ((ifd = open(filename, O_RDONLY)) < 0)
 		pfatal("can't open file %s", filename);
 	if (i_size) {
 		i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
 		if (i_womp == MAP_FAILED) {
 			perror("mmap failed");
 			i_womp = NULL;
 			close(ifd);
 			return false;
+		}
 	} else {
 		i_womp = NULL;
+	}
 	close(ifd);
 	if (i_size)
 		madvise(i_womp, i_size, MADV_SEQUENTIAL);
 	/* estimate the number of lines */
 	lines_allocated = i_size / 25;
 	if (lines_allocated < 100)
 		lines_allocated = 100;
 	if (!reallocate_lines(&lines_allocated))
 		return false;
 	/* now scan the buffer and build pointer array */
 	iline = 1;
 	i_ptr[iline] = i_womp;
 	/* test for NUL too, to maintain the behavior of the original code */
 	for (s = i_womp, i = 0; i < i_size && *s != '\0'; s++, i++) {
 		if (*s == '\n') {
 			if (iline == lines_allocated) {
 				if (!reallocate_lines(&lines_allocated))
 					return false;
+			}
 			/* these are NOT NUL terminated */
 			i_ptr[++iline] = s + 1;
+		}
+	}
 	/* if the last line contains no EOL, append one */
 	if (i_size > 0 && i_womp[i_size - 1] != '\n') {
 		last_line_missing_eol = true;
 		/* fix last line */
 		sz = s - i_ptr[iline];
 		p = malloc(sz + 1);
 		if (p == NULL) {
 			free(i_ptr);
 			i_ptr = NULL;
 			munmap(i_womp, i_size);
 			i_womp = NULL;
 			return false;
+		}
 		memcpy(p, i_ptr[iline], sz);
 		p[sz] = '\n';
 		i_ptr[iline] = p;
 		/* count the extra line and make it point to some valid mem */
 		i_ptr[++iline] = empty_line;
 	} else
 		last_line_missing_eol = false;
 	input_lines = iline - 1;
 	/* now check for revision, if any */
 	if (revision != NULL) {
 		if (!rev_in_string(i_womp)) {
 			if (force) {
 				if (verbose)
 					say("Warning: this file doesn't appear "
 					    "to be the %s version--patching anyway.\n",
 					    revision);
 			} else if (batch) {
 				fatal("this file doesn't appear to be the "
 				    "%s version--aborting.\n",
 				    revision);
 			} else {
 				ask("This file doesn't appear to be the "
 				    "%s version--patch anyway? [n] ",
 				    revision);
 				if (*buf != 'y')
 					fatal("aborted\n");
+			}
 		} else if (verbose)
 			say("Good.  This file appears to be the %s version.\n",
 			    revision);
+	}
 	return true;		/* plan a will work */
+}
 /* Keep (virtually) nothing in memory. */
 static void
 plan_b(const char *filename)
+{
 	FILE	*ifp;
 	size_t	i = 0, j, maxlen = 1;
 	char	*p;
 	bool	found_revision = (revision == NULL);
 	using_plan_a = false;
 	if ((ifp = fopen(filename, "r")) == NULL)
 		pfatal("can't open file %s", filename);
 	unlink(TMPINNAME);
 	if ((tifd = open(TMPINNAME, O_EXCL | O_CREAT | O_WRONLY, 0666)) < 0)
 		pfatal("can't open file %s", TMPINNAME);
 	while (fgets(buf, buf_len, ifp) != NULL) {
 		if (revision != NULL && !found_revision && rev_in_string(buf))
 			found_revision = true;
 		if ((i = strlen(buf)) > maxlen)
 			maxlen = i;	/* find longest line */
+	}
 	last_line_missing_eol = i > 0 && buf[i - 1] != '\n';
 	if (last_line_missing_eol && maxlen == i)
 		maxlen++;
 	if (revision != NULL) {
 		if (!found_revision) {
 			if (force) {
 				if (verbose)
 					say("Warning: this file doesn't appear "
 					    "to be the %s version--patching anyway.\n",
 					    revision);
 			} else if (batch) {
 				fatal("this file doesn't appear to be the "
 				    "%s version--aborting.\n",
 				    revision);
 			} else {
 				ask("This file doesn't appear to be the %s "
 				    "version--patch anyway? [n] ",
 				    revision);
 				if (*buf != 'y')
 					fatal("aborted\n");
+			}
 		} else if (verbose)
 			say("Good.  This file appears to be the %s version.\n",
 			    revision);
+	}
 	fseek(ifp, 0L, SEEK_SET);	/* rewind file */
 	lines_per_buf = BUFFERSIZE / maxlen;
 	tireclen = maxlen;
 	tibuf[0] = malloc(BUFFERSIZE + 1);
 	if (tibuf[0] == NULL)
 		fatal("out of memory\n");
 	tibuf[1] = malloc(BUFFERSIZE + 1);
 	if (tibuf[1] == NULL)
 		fatal("out of memory\n");
 	for (i = 1;; i++) {
 		p = tibuf[0] + maxlen * (i % lines_per_buf);
 		if (i % lines_per_buf == 0)	/* new block */
 			if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
 				pfatal("can't write temp file");
 		if (fgets(p, maxlen + 1, ifp) == NULL) {
 			input_lines = i - 1;
 			if (i % lines_per_buf != 0)
 				if (write(tifd, tibuf[0], BUFFERSIZE) < BUFFERSIZE)
 					pfatal("can't write temp file");
 			break;
+		}
 		j = strlen(p);
 		/* These are '\n' terminated strings, so no need to add a NUL */
 		if (j == 0 || p[j - 1] != '\n')
 			p[j] = '\n';
+	}
 	fclose(ifp);
 	close(tifd);
 	if ((tifd = open(TMPINNAME, O_RDONLY)) < 0)
 		pfatal("can't reopen file %s", TMPINNAME);
+}
 /*
  * Fetch a line from the input file, \n terminated, not necessarily \0.
  */
 char *
 ifetch(LINENUM line, int whichbuf)
+{
 	if (line < 1 || line > input_lines) {
 		if (warn_on_invalid_line) {
 			say("No such line %ld in input file, ignoring\n", line);
 			warn_on_invalid_line = false;
+		}
 		return NULL;
+	}
 	if (using_plan_a)
 		return i_ptr[line];
 	else {
 		LINENUM	offline = line % lines_per_buf;
 		LINENUM	baseline = line - offline;
 		if (tiline[0] == baseline)
 			whichbuf = 0;
 		else if (tiline[1] == baseline)
 			whichbuf = 1;
 		else {
 			tiline[whichbuf] = baseline;
 			if (lseek(tifd, (off_t) (baseline / lines_per_buf *
 			    BUFFERSIZE), SEEK_SET) < 0)
 				pfatal("cannot seek in the temporary input file");
 			if (read(tifd, tibuf[whichbuf], BUFFERSIZE) < 0)
 				pfatal("error reading tmp file %s", TMPINNAME);
+		}
 		return tibuf[whichbuf] + (tireclen * offline);
+	}
+}
 /*
  * True if the string argument contains the revision number we want.
  */
 static bool
 rev_in_string(const char *string)
+{
 	const char	*s;
 	size_t		patlen;
 	if (revision == NULL)
 		return true;
 	patlen = strlen(revision);
 	if (strnEQ(string, revision, patlen) && isspace((unsigned char)string[patlen]))
 		return true;
 	for (s = string; *s; s++) {
 		if (isspace((unsigned char)*s) && strnEQ(s + 1, revision, patlen) &&
 		    isspace((unsigned char)s[patlen + 1])) {
 			return true;
+		}
+	}
 	return false;
+}