Imported Upstream version 93u+upstream

1 files changed, 265 insertions, 0 deletions

diff --git a/src/lib/libcmd/pathchk.c b/src/lib/libcmd/pathchk.c
new file mode 100644
index 0000000..0cba4bd
--- /dev/null
+++ b/src/lib/libcmd/pathchk.c
@@ -0,0 +1,265 @@
+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*          Copyright (c) 1992-2012 AT&T Intellectual Property          *
+*                      and is licensed under the                       *
+*                 Eclipse Public License, Version 1.0                  *
+*                    by AT&T Intellectual Property                     *
+*                                                                      *
+*                A copy of the License is available at                 *
+*          http://www.eclipse.org/org/documents/epl-v10.html           *
+*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
+*                                                                      *
+*              Information and Software Systems Research               *
+*                            AT&T Research                             *
+*                           Florham Park NJ                            *
+*                                                                      *
+*                 Glenn Fowler <gsf@research.att.com>                  *
+*                  David Korn <dgk@research.att.com>                   *
+*                                                                      *
+***********************************************************************/
+#pragma prototyped
+/*
+ * pathchk
+ *
+ * Written by David Korn
+ */
+
+static const char usage[] =
+"[-?\n@(#)$Id: pathchk (AT&T Research) 2009-07-24 $\n]"
+USAGE_LICENSE
+"[+NAME?pathchk - check pathnames for portability]"
+"[+DESCRIPTION?\bpathchk\b checks each \apathname\a to see if it is "
+    "valid and/or portable. A \apathname\a is valid if it can be used to "
+    "access or create a file without causing syntax errors. A file is "
+    "portable if no truncation will result on any conforming POSIX.1 "
+    "implementation.]"
+"[+?By default \bpathchk\b checks each component of each \apathname\a "
+    "based on the underlying file system. A diagnostic is written to "
+    "standard error for each pathname that:]"
+    "{"
+        "[+-?Is longer than \b$(getconf PATH_MAX)\b bytes.]"
+        "[+-?Contains any component longer than \b$(getconf NAME_MAX)\b "
+            "bytes.]"
+        "[+-?Contains any directory component in a directory that is not "
+            "searchable.]"
+        "[+-?Contains any character in any component that is not valid "
+            "in its containing directory.]"
+        "[+-?Is empty.]"
+    "}"
+"[p:components?Instead of performing length checks on the underlying "
+    "file system, write a diagnostic for each pathname operand that:]"
+    "{"
+        "[+-?Is longer than \b$(getconf _POSIX_PATH_MAX)\b bytes.]"
+        "[+-?Contains any component longer than \b$(getconf "
+            "_POSIX_NAME_MAX)\b bytes.]"
+        "[+-?Contains any character in any component that is not in the "
+            "portable filename character set.]"
+    "}"
+"[P:path?Write a diagnostic for each pathname operand that:]"
+    "{"
+        "[+-?Contains any component with \b-\b as the first character.]"
+        "[+-?Is empty.]"
+    "}"
+"[a:all|portability?Equivalent to \b--components\b \b--path\b.]"
+"\n"
+"\npathname ...\n"
+"\n"
+"[+EXIT STATUS?]"
+    "{"
+        "[+0?All \apathname\a operands passed all of the checks.]"
+        "[+>0?An error occurred.]"
+    "}"
+"[+SEE ALSO?\bgetconf\b(1), \bcreat\b(2), \bpathchk\b(2)]"
+;
+
+
+#include	<cmd.h>
+#include	<ls.h>
+
+#define COMPONENTS	0x1
+#define PATH	0x2
+
+#define isport(c)	(((c)>='a' && (c)<='z') || ((c)>='A' && (c)<='Z') || ((c)>='0' && (c)<='9') || (strchr("._-",(c))!=0) )
+
+/*
+ * call pathconf and handle unlimited sizes
+ */ 
+static long mypathconf(const char *path, int op)
+{
+	register long			r;
+
+	static const char* const	ops[] = { "NAME_MAX", "PATH_MAX" };
+
+	errno = 0;
+	if ((r = strtol(astconf(ops[op], path, NiL), NiL, 0)) < 0 && !errno)
+		return LONG_MAX;
+	return r;
+}
+
+/*
+ * returns 1 if <path> passes test
+ */
+static int pathchk(char* path, int mode)
+{
+	register char *cp=path, *cpold;
+	register int c;
+	register long r,name_max,path_max;
+	char buf[2];
+
+	if(!*path)
+	{
+		if (mode & PATH)
+			error(2,"path is empty");
+		return -1;
+	}
+	if(mode & COMPONENTS)
+	{
+		name_max = _POSIX_NAME_MAX;
+		path_max = _POSIX_PATH_MAX;
+	}
+	else
+	{
+		char tmp[2];
+		name_max = path_max = 0;
+		tmp[0] = (*cp=='/'? '/': '.');
+		tmp[1] = 0;
+		if((r=mypathconf(tmp, 0)) > _POSIX_NAME_MAX)
+			name_max = r;
+		if((r=mypathconf(tmp, 1)) > _POSIX_PATH_MAX)
+			path_max = r;
+		if(*cp!='/')
+		{
+			if(name_max==0||path_max==0)
+			{
+				if(!(cpold = getcwd((char*)0, 0)) && errno == EINVAL && (cpold = newof(0, char, PATH_MAX, 0)) && !getcwd(cpold, PATH_MAX))
+				{
+					free(cpold);
+					cpold = 0;
+				}
+				if(cpold)
+				{
+					cp = cpold + strlen(cpold);
+					while(name_max==0 || path_max==0)
+					{
+						if(cp>cpold)
+							while(--cp>cpold && *cp=='/');
+						*++cp = 0;
+						if(name_max==0 && (r=mypathconf(cpold, 0)) > _POSIX_NAME_MAX)
+							name_max = r;
+						if(path_max==0 && (r=mypathconf(cpold, 1)) > _POSIX_PATH_MAX)
+							path_max=r;
+						if(--cp==cpold)
+						{
+							free(cpold);
+							break;
+						}
+						while(*cp!='/')
+							cp--;
+					}
+					cp=path;
+				}
+			}
+			while(*cp=='/')
+				cp++;
+		}
+		if(name_max==0)
+			name_max=_POSIX_NAME_MAX;
+		if(path_max==0)
+			path_max=_POSIX_PATH_MAX;
+		while(*(cpold=cp))
+		{
+			while((c= *cp++) && c!='/');
+			if((cp-cpold) > name_max)
+				goto err;
+			errno=0;
+			cp[-1] = 0;
+			r = mypathconf(path, 0);
+			if((cp[-1]=c)==0)
+				cp--;
+			else while(*cp=='/')
+				cp++;
+			if(r>=0)
+				name_max=(r<_POSIX_NAME_MAX?_POSIX_NAME_MAX:r);
+			else if(errno==EINVAL)
+				continue;
+#ifdef ENAMETOOLONG
+			else if(errno==ENAMETOOLONG)
+			{
+				error(2,"%s: pathname too long",path);
+				return -1;
+			}
+#endif /*ENAMETOOLONG*/
+			else
+				break;
+		}
+	}
+	while(*(cpold=cp))
+	{
+		if((mode & PATH) && *cp == '-')
+		{
+			error(2,"%s: path component begins with '-'",path,fmtquote(buf, NiL, "'", 1, 0));
+			return -1;
+		}
+		while((c= *cp++) && c!='/')
+			if((mode & COMPONENTS) && !isport(c))
+			{
+				buf[0] = c;
+				buf[1] = 0;
+				error(2,"%s: '%s' not in portable character set",path,fmtquote(buf, NiL, "'", 1, 0));
+				return -1;
+			}
+		if((cp-cpold) > name_max)
+			goto err;
+		if(c==0)
+			break;
+		while(*cp=='/')
+			cp++;
+	}
+	if((cp-path) >= path_max)
+	{
+		error(2, "%s: pathname too long", path);
+		return -1;
+	}
+	return 0;
+ err:
+	error(2, "%s: component name %.*s too long", path, cp-cpold-1, cpold);
+	return -1;
+}
+
+int
+b_pathchk(int argc, char** argv, Shbltin_t* context)
+{
+	register int	mode = 0;
+	register char*	s;
+
+	cmdinit(argc, argv, context, ERROR_CATALOG, 0);
+	for (;;)
+	{
+		switch (optget(argv, usage))
+		{
+  		case 'a':
+			mode |= COMPONENTS|PATH;
+			continue;
+  		case 'p':
+			mode |= COMPONENTS;
+			continue;
+  		case 'P':
+			mode |= PATH;
+			continue;
+		case ':':
+			error(2, "%s", opt_info.arg);
+			break;
+		case '?':
+			error(ERROR_usage(2), "%s", opt_info.arg);
+			break;
+		}
+		break;
+	}
+	argv += opt_info.index;
+	if (!*argv || error_info.errors)
+		error(ERROR_usage(2),"%s", optusage(NiL));
+	while (s = *argv++)
+		pathchk(s, mode);
+	return error_info.errors != 0;
+}