OpenSolaris Launch

1 files changed, 591 insertions, 0 deletions

diff --git a/usr/src/cmd/filesync/files.c b/usr/src/cmd/filesync/files.c
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+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License, Version 1.0 only
+ * (the "License").  You may not use this file except in compliance
+ * with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright (c) 1995 Sun Microsystems, Inc.  All Rights Reserved
+ *
+ * module:
+ *	files.c
+ *
+ * purpose:
+ *	routines to examine and manipulate file names
+ *
+ * contents:
+ *	qualify ... ensure that a name is fully qualified
+ *	expand  ... expand env variables within a string or file name
+ *	noblanks .. ensure that a name contains no embdded unescaped blanks
+ *	lex ....... a lexer that can handle escaped/embedded blanks
+ *	wildcards . see whether or not a name contains wild cards
+ *	prefix .... does one string begin with another
+ *	suffix .... does one string end with another
+ *	contains .. does one string contain another
+ *
+ *	cannonize (static) ...	compress redundant "." and ".." out of name
+ *
+ * notes:
+ *	we are interested in embedded blanks because international
+ *	character sets and non-unix file systems can both contain
+ *	the byte 0x20.  Thus, whenever we record a filename in
+ *	file, we must be careful to escape any embedded blanks that
+ *	cause trouble when we re-lex that file later.
+ */
+#ident	"%W%	%E% SMI"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <unistd.h>
+
+#include "filesync.h"
+#include "messages.h"
+
+static void cannonize(char *name);
+
+/*
+ * routine:
+ *	qualify
+ *
+ * purpose:
+ *	to fully qualify a name
+ *
+ * parameters:
+ *	name to be qualified
+ *
+ * returns:
+ *	either original pointer or copy to a new (malloced) buffer
+ *
+ * notes:
+ *	someday I may conclude that I should always make a copy
+ *	so that the caller can know that it is safe to free the parm
+ *
+ *	I thought about this and concluded that there is never a need
+ *	to fully qualify a string containing variables.  If the string
+ *	came from the command line, the variables were already expanded
+ *	and if it came from the rules data base it is required to already
+ *	be fully qualified.
+ */
+char *
+qualify(char *name)
+{
+	char namebuf[ MAX_PATH ];
+
+	/* in the simple case, the parameter is already there */
+	if (*name == '/') {
+		cannonize(name);
+		return (name);
+	}
+
+	/* things that begin with variables get the benefit of the doubt */
+	if (*name == '$') {
+		cannonize(name);
+		return (name);
+	}
+
+	/* start with the current working directory	*/
+	if (getcwd(namebuf, sizeof (namebuf)) == 0) {
+		fprintf(stderr, gettext(ERR_nocwd), name);
+		exit(ERR_OTHER);
+	}
+
+	/* make sure we have room for our file name	*/
+	if ((strlen(namebuf) + strlen(name) + 2) >= sizeof (namebuf)) {
+		fprintf(stderr, gettext(ERR_longname), name);
+		exit(ERR_OTHER);
+	}
+
+	/* append the specified file name to it	*/
+	strcat(namebuf, "/");
+	strcat(namebuf, name);
+
+	/* filter out redundant dots	*/
+	cannonize(namebuf);
+
+	if (opt_debug & DBG_VARS)
+		fprintf(stderr, "VARS: QUALIFY %s to %s\n", name, namebuf);
+
+	/* and return a newly malloc'd copy	*/
+	return (strdup(namebuf));
+}
+
+/*
+ * routine:
+ *	expand
+ *
+ * purpose:
+ *	to expand variable names within a string
+ *
+ * parameters:
+ *	string to be expanded.  Variable references always begin
+ *	with a $ and are delimited by parens or curleys.
+ *
+ * returns:
+ *	either original pointer or a copy to a new (malloced) buffer
+ *
+ * notes:
+ *	someday I may conclude that I should always make a copy
+ *	so that the caller can know that it is safe to free the parm
+ *
+ *	someday I may decide to support escape conventions for embedding
+ *	$(){} in file names, but I suspec that day will never come.
+ *
+ *	I thought about this and concluded there was no reason to
+ *	fully qualify these names, because the only names that should
+ *	need qualification are src/dst lines from the command line,
+ *	and the shell should have handled those for me.  Once something
+ *	makes it into the database, it is expected to be fully qualified
+ *	already.
+ *
+ *	We are limited to producing strings of length MAX_PATH or less
+ *	and variable names of length MAX_NAME or less.  In practice,
+ *	these limitations should not be a problem.
+ */
+char *
+expand(char *name)
+{	const char *s;
+	char *p, *v;
+	char delim;
+	char namebuf[ MAX_PATH ];
+	char varbuf[ MAX_NAME ];
+
+	/* first see if there are no variables to be bound */
+	for (s = name; *s && *s != '$'; s++);
+	if (*s == 0)
+		return (name);
+
+	/* move through the string, copying and expanding	*/
+	for (s = name, p = namebuf; *s; s++) {
+
+		/* check for overflow	*/
+		if (p >= &namebuf[ MAX_PATH ]) {
+			fprintf(stderr, gettext(ERR_longname), name);
+			exit(ERR_OTHER);
+		}
+
+		/* normal characters, we just copy		*/
+		if (*s != '$') {
+			*p++ = *s;
+			continue;
+		}
+
+		/* figure out how the variable name is delimited */
+		delim = *++s;
+		if (delim == '(') {
+			delim = ')';
+			s++;
+		} else if (delim == '{') {
+			delim = '}';
+			s++;
+		} else
+			delim = 0;
+
+		/* copy the variable name up to the closing delimiter */
+		for (v = varbuf; *s; s++) {
+			if (isalnum(*s) || (*s == '_') ||
+				(delim && *s != delim))
+				*v++ = *s;
+			else
+				break;
+
+			/* make sure we don't overflow var name buffer	*/
+			if (v >= &varbuf[MAX_NAME - 1]) {
+				*v = 0;
+				fprintf(stderr, gettext(ERR_longname), varbuf);
+				exit(ERR_OTHER);
+			}
+		}
+
+		*v = 0;
+
+		/* FIX THIS ... there must be a more elegant way */
+		/* we may have to back up because s will be bumped */
+		if (delim == 0 || *s != delim)
+			s--;
+
+		/* look up the variable 			*/
+		v = getenv(varbuf);
+		if (v == 0 || *v == 0) {
+			fprintf(stderr, gettext(ERR_undef), varbuf);
+			return (0);
+		}
+
+		/* copy the variable into the buffer		*/
+		while (*v)
+			*p++ = *v++;
+	}
+
+	/* null terminate the copy	*/
+	*p = 0;
+
+	/* compress out any redundant dots and dot-dots	*/
+	cannonize(namebuf);
+
+	if (opt_debug & DBG_VARS)
+		fprintf(stderr, "VARS: EXPAND %s to %s\n", name, namebuf);
+
+	/* and return a newly malloc'd copy	*/
+	return (strdup(namebuf));
+}
+
+/*
+ * routine:
+ *	noblanks
+ *
+ * purpose:
+ *	to ensure that a name contains no unescaped embedded blanks
+ *
+ * parameters:
+ *	pointer to name
+ *
+ * returns:
+ *	pointer to name or pointer to buffer containing escaped version of name
+ *
+ * notes:
+ *	this routine can be called on full file names, and so can
+ *	conceivably require an arbitrarily large buffer.
+ */
+const char *
+noblanks(const char *name)
+{
+	const char *s;
+	char *p;
+	static char *namebuf = 0;
+	static int buflen = 0;
+	int l;
+
+	/* first see if there are no embedded blanks	*/
+	for (s = name; *s && *s != ' '; s++);
+	if (*s == 0)
+		return (name);
+
+	/* make sure we have a buffer large enough for the worst case	*/
+	l = 4 + (2*strlen(name));
+	for (buflen = MAX_PATH; buflen < l; buflen += MAX_NAME);
+	namebuf = (char *) realloc(namebuf, buflen);
+
+	/* quote the name, and copy it, escaping quotes	*/
+	p = namebuf;
+	*p++ = '"';
+
+	for (s = name; *s; s++) {
+		if (*s == '"' || *s == '\\')
+			*p++ = '\\';
+		*p++ = *s;
+	}
+
+	*p++ = '"';
+	*p = 0;
+
+	return (namebuf);
+}
+
+/*
+ * routine:
+ *	lex
+ *
+ * purpose:
+ *	my own version of strtok that handles quoting and escaping
+ *
+ * parameters:
+ *	FILE structure for file to read (0 for same string, same file)
+ *
+ * returns:
+ *	pointer to next token
+ *
+ * notes:
+ *	this routine makes no changes to the string it is passed,
+ *	copying tokens into a static buffer.
+ *
+ *	this routine handles continuation lines after reading and
+ *	before the lexing even starts.  This limits continued lines
+ *	to a length of MAX_LINE, but keeps everything else very simple.
+ *	We also, therefore, limit tokens to a maximum length of MAX_LINE.
+ */
+int lex_linenum;		/* line number in current input file	*/
+
+char *
+lex(FILE *file)
+{	char c, delim;
+	char *p;
+	char *s;
+	static char *savep;
+	static char namebuf[ MAX_LINE ];
+	static char inbuf[ MAX_LINE ];
+
+	if (file) {			/* read a new line		*/
+		p = inbuf + sizeof (inbuf);
+
+		/* read the next input line, with all continuations	*/
+		for (s = inbuf; savep = fgets(s, p - s, file); ) {
+			lex_linenum++;
+
+			/* go find the last character of the input line	*/
+			while (*s && s[1])
+				s++;
+			if (*s == '\n')
+				s--;
+
+			/* see whether or not we need a continuation	*/
+			if (s < inbuf || *s != '\\')
+				break;
+
+			continue;
+		}
+
+		if (savep == 0)
+			return (0);
+
+		s = inbuf;
+	} else {			/* continue with old line	*/
+		if (savep == 0)
+			return (0);
+		s = savep;
+	}
+	savep = 0;
+
+	/* skip over leading white space	*/
+	while (isspace(*s))
+		s++;
+	if (*s == 0)
+		return (0);
+
+	/* see if this is a quoted string	*/
+	c = *s;
+	if (c == '\'' || c == '"') {
+		delim = c;
+		s++;
+	} else
+		delim = 0;
+
+	/* copy the token into the buffer	*/
+	for (p = namebuf; (c = *s) != 0; s++) {
+		/* literal escape		*/
+		if (c == '\\') {
+			s++;
+			*p++ = *s;
+			continue;
+		}
+
+		/* closing delimiter		*/
+		if (c == delim) {
+			s++;
+			break;
+		}
+
+		/* delimiting white space	*/
+		if (delim == 0 && isspace(c))
+			break;
+
+		/* ordinary characters		*/
+		*p++ = *s;
+	}
+
+
+	/* remember where we left off		*/
+	savep = *s ? s : 0;
+
+	/* null terminate and return the buffer	*/
+	*p = 0;
+	return (namebuf);
+}
+
+/*
+ * routine:
+ *	wildcards
+ *
+ * purpose:
+ *	determine whether or not there are any wild cards in a name
+ *
+ * parameters:
+ *	name to be checked
+ *
+ * returns:
+ *	true/false
+ *
+ * notes:
+ *	we use this to take shortcuts
+ */
+bool_t
+wildcards(const char *name)
+{	const char *s;
+	int literal = 0;
+
+	for (s = name; *s; s++)
+		if (literal)
+			switch (*s) {
+				case '\'':	/* end of literal string */
+					literal = 0;
+					continue;
+				case '\\':	/* escape next character */
+					s++;
+					continue;
+			}
+		else
+			switch (*s) {
+				case '\'':	/* literal string	*/
+					literal = 1;
+					continue;
+				case '\\':	/* escape next character */
+					s++;
+					continue;
+				case '*':
+				case '[':
+				case '{':
+				case '?':
+					/* any of these is a wild card	*/
+					return (TRUE);
+			}
+
+	return (FALSE);
+}
+
+/*
+ * routine:
+ *	cannonize
+ *
+ * purpose:
+ *	to compress redundant dots out of a path
+ *
+ * parameters:
+ *	file name in an editable buffer
+ *
+ * returns:
+ *	void
+ *
+ * notes:
+ *	because we compress the string in place, there is no danger
+ *	of our overflowing any fixed sized buffer.
+ */
+static void
+cannonize(char *name)
+{	char *s, *p;
+
+	/* leading dot-slashes	*/
+	for (s = name; *s == '.' && s[1] == '/'; strcpy(s, &s[2]));
+
+	for (s = name; *s; s++) {
+		/* interesting things happen after slashes	*/
+		if (*s != '/')
+			continue;
+
+		/* embedded dot-slashes */
+		while (s[1] == '.' && s[2] == '/')
+			strcpy(&s[1], &s[3]);
+
+		/* embedded slash-dot-dot-slash	*/
+		if (strncmp(s, "/../", 4) == 0) {
+			/* scan backwards to eliminate last directory */
+			for (p = s-1; p > name && *p != '/'; p--);
+
+			if (p < name)
+				p = name;
+			strcpy(p, &s[3]);
+		}
+
+		continue;
+	}
+}
+
+/*
+ * routine:
+ *	prefix
+ *
+ * purpose:
+ *	determine whether or not one string begins with another
+ *
+ * parameters:
+ *	string to be tested
+ *	suspected prefix
+ *
+ * returns:
+ *	no	0
+ *	yes	pointer character after prefix
+ */
+const char *
+prefix(const char *s, const char *p)
+{
+	while (*p)
+		if (*p++ != *s++)
+			return (0);
+
+	return (s);
+}
+
+/*
+ * routine:
+ *	suffix
+ *
+ * purpose:
+ *	determine whether or not one string ends with another
+ *
+ * parameters:
+ *	string to be tested
+ *	suspected suffix
+ *
+ * returns:
+ *	true/false
+ */
+bool_t
+suffix(const char *str, const char *suf)
+{	const char *s;
+
+	/* go to where the alleged suffix would start */
+	for (s = str; *s; s++);
+	s -= strlen(suf);
+	if (s < str)
+		return (FALSE);
+
+	/* see if the string ends with the suffix */
+	while (*suf)
+		if (*suf++ != *s++)
+			return (FALSE);
+
+	return (TRUE);
+}
+
+/*
+ * routine:
+ *	contains
+ *
+ * purpose:
+ *	determine whether or not one string contains another
+ *
+ * parameters:
+ *	string to be checked
+ *	pattern we are seeking
+ *
+ * returns:
+ *	true/false
+ */
+bool_t
+contains(const char *str, const char *pat)
+{	const char *s, *p;
+
+	while (*str) {
+		if (*str++ == *pat) {
+			for (s = str, p = &pat[1]; *s == *p; s++, p++)
+				if (p[1] == 0)
+					return (TRUE);
+		}
+	}
+
+	return (FALSE);
+}