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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	bin/ksh/path.c	Lines:	65	115	56.5 %
Date:	2017-11-07	Branches:	57	126	45.2 %


/*	$OpenBSD: path.c,v 1.19 2017/09/03 11:52:01 jca Exp $	*/

#include <sys/stat.h>

#include <errno.h>
#include <string.h>
#include <unistd.h>

#include "sh.h"

/*
 *	Contains a routine to search a : separated list of
 *	paths (a la CDPATH) and make appropriate file names.
 *	Also contains a routine to simplify .'s and ..'s out of
 *	a path name.
 *
 *	Larry Bouzane (larry@cs.mun.ca)
 */

static char	*do_phys_path(XString *, char *, const char *);

/*
 *	Makes a filename into result using the following algorithm.
 *	- make result NULL
 *	- if file starts with '/', append file to result & set cdpathp to NULL
 *	- if file starts with ./ or ../ append cwd and file to result
 *	  and set cdpathp to NULL
 *	- if the first element of cdpathp doesnt start with a '/' xx or '.' xx
 *	  then cwd is appended to result.
 *	- the first element of cdpathp is appended to result
 *	- file is appended to result
 *	- cdpathp is set to the start of the next element in cdpathp (or NULL
 *	  if there are no more elements.
 *	The return value indicates whether a non-null element from cdpathp
 *	was appended to result.
 */
int
make_path(const char *cwd, const char *file,
    char **cdpathp,		/* & of : separated list */
    XString *xsp,
    int *phys_pathp)
{
	int	rval = 0;
	int	use_cdpath = 1;
	char	*plist;
	int	len;
	int	plen = 0;
	char	*xp = Xstring(*xsp, xp);

	if (!file)
		file = null;

	if (file[0] == '/') {
		*phys_pathp = 0;
		use_cdpath = 0;
	} else {
		if (file[0] == '.') {
			char c = file[1];

			if (c == '.')
				c = file[2];
			if (c == '/' || c == '\0')
				use_cdpath = 0;
		}

		plist = *cdpathp;
		if (!plist)
			use_cdpath = 0;
		else if (use_cdpath) {
			char *pend;

			for (pend = plist; *pend && *pend != ':'; pend++)
				;
			plen = pend - plist;
			*cdpathp = *pend ? ++pend : NULL;
		}

		if ((use_cdpath == 0 || !plen || plist[0] != '/') &&
		    (cwd && *cwd)) {
			len = strlen(cwd);
			XcheckN(*xsp, xp, len);
			memcpy(xp, cwd, len);
			xp += len;
			if (cwd[len - 1] != '/')
				Xput(*xsp, xp, '/');
		}
		*phys_pathp = Xlength(*xsp, xp);
		if (use_cdpath && plen) {
			XcheckN(*xsp, xp, plen);
			memcpy(xp, plist, plen);
			xp += plen;
			if (plist[plen - 1] != '/')
				Xput(*xsp, xp, '/');
			rval = 1;
		}
	}

	len = strlen(file) + 1;
	XcheckN(*xsp, xp, len);
	memcpy(xp, file, len);

	if (!use_cdpath)
		*cdpathp = NULL;

	return rval;
}

/*
 * Simplify pathnames containing "." and ".." entries.
 * ie, simplify_path("/a/b/c/./../d/..") returns "/a/b"
 */
void
simplify_path(char *path)
{
	char	*cur;
	char	*t;
	int	isrooted;
	char	*very_start = path;
	char	*start;

	if (!*path)
		return;

	if ((isrooted = (path[0] == '/')))
		very_start++;

	/* Before			After
	 *  /foo/			/foo
	 *  /foo/../../bar		/bar
	 *  /foo/./blah/..		/foo
	 *  .				.
	 *  ..				..
	 *  ./foo			foo
	 *  foo/../../../bar		../../bar
	 */

	for (cur = t = start = very_start; ; ) {
		/* treat multiple '/'s as one '/' */
		while (*t == '/')
			t++;

		if (*t == '\0') {
			if (cur == path)
				/* convert empty path to dot */
				*cur++ = '.';
			*cur = '\0';
			break;
		}

		if (t[0] == '.') {
			if (!t[1] || t[1] == '/') {
				t += 1;
				continue;
			} else if (t[1] == '.' && (!t[2] || t[2] == '/')) {
				if (!isrooted && cur == start) {
					if (cur != very_start)
						*cur++ = '/';
					*cur++ = '.';
					*cur++ = '.';
					start = cur;
				} else if (cur != start)
					while (--cur > start && *cur != '/')
						;
				t += 2;
				continue;
			}
		}

		if (cur != very_start)
			*cur++ = '/';

		/* find/copy next component of pathname */
		while (*t && *t != '/')
			*cur++ = *t++;
	}
}


void
set_current_wd(char *path)
{
	int len;
	char *p = path;

	if (!p && !(p = ksh_get_wd(NULL, 0)))
		p = null;

	len = strlen(p) + 1;

	if (len > current_wd_size)
		current_wd = aresize(current_wd, current_wd_size = len, APERM);
	memcpy(current_wd, p, len);
	if (p != path && p != null)
		afree(p, ATEMP);
}

char *
get_phys_path(const char *path)
{
	XString xs;
	char *xp;

	Xinit(xs, xp, strlen(path) + 1, ATEMP);

	xp = do_phys_path(&xs, xp, path);

	if (!xp)
		return NULL;

	if (Xlength(xs, xp) == 0)
		Xput(xs, xp, '/');
	Xput(xs, xp, '\0');

	return Xclose(xs, xp);
}

static char *
do_phys_path(XString *xsp, char *xp, const char *path)
{
	const char *p, *q;
	int len, llen;
	int savepos;
	char lbuf[PATH_MAX];

	Xcheck(*xsp, xp);
	for (p = path; p; p = q) {
		while (*p == '/')
			p++;
		if (!*p)
			break;
		len = (q = strchr(p, '/')) ? q - p : strlen(p);
		if (len == 1 && p[0] == '.')
			continue;
		if (len == 2 && p[0] == '.' && p[1] == '.') {
			while (xp > Xstring(*xsp, xp)) {
				xp--;
				if (*xp == '/')
					break;
			}
			continue;
		}

		savepos = Xsavepos(*xsp, xp);
		Xput(*xsp, xp, '/');
		XcheckN(*xsp, xp, len + 1);
		memcpy(xp, p, len);
		xp += len;
		*xp = '\0';

		llen = readlink(Xstring(*xsp, xp), lbuf, sizeof(lbuf) - 1);
		if (llen < 0) {
			/* EINVAL means it wasn't a symlink... */
			if (errno != EINVAL)
				return NULL;
			continue;
		}
		lbuf[llen] = '\0';

		/* If absolute path, start from scratch.. */
		xp = lbuf[0] == '/' ? Xstring(*xsp, xp) :
		    Xrestpos(*xsp, xp, savepos);
		if (!(xp = do_phys_path(xsp, xp, lbuf)))
			return NULL;
	}
	return xp;
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: path.c,v 1.19 2017/09/03 11:52:01 jca Exp $ */
2
3			#include <sys/stat.h>
4
5			#include <errno.h>
6			#include <string.h>
7			#include <unistd.h>
8
9			#include "sh.h"
10
11			/*
12			* Contains a routine to search a : separated list of
13			* paths (a la CDPATH) and make appropriate file names.
14			* Also contains a routine to simplify .'s and ..'s out of
15			* a path name.
16			*
17			* Larry Bouzane (larry@cs.mun.ca)
18			*/
19
20			static char do_phys_path(XString , char , const char );
21
22			/*
23			* Makes a filename into result using the following algorithm.
24			* - make result NULL
25			* - if file starts with '/', append file to result & set cdpathp to NULL
26			* - if file starts with ./ or ../ append cwd and file to result
27			* and set cdpathp to NULL
28			* - if the first element of cdpathp doesnt start with a '/' xx or '.' xx
29			* then cwd is appended to result.
30			* - the first element of cdpathp is appended to result
31			* - file is appended to result
32			* - cdpathp is set to the start of the next element in cdpathp (or NULL
33			* if there are no more elements.
34			* The return value indicates whether a non-null element from cdpathp
35			* was appended to result.
36			*/
37			int
38			make_path(const char cwd, const char file,
39			char *cdpathp, / & of : separated list */
40			XString *xsp,
41			int *phys_pathp)
42			{
43			int rval = 0;
44			int use_cdpath = 1;
45			char *plist;
46			int len;
47			int plen = 0;
48		92460	char xp = Xstring(xsp, xp);
49
50	✗✓	46230	if (!file)
51			file = null;
52
53	✓✓	46230	if (file[0] == '/') {
54		46042	*phys_pathp = 0;
55			use_cdpath = 0;
56		46042	} else {
57	✓✓	188	if (file[0] == '.') {
58		53	char c = file[1];
59
60	✓✓	53	if (c == '.')
61		51	c = file[2];
62	✓✓✓✗	100	if (c == '/' \|\| c == '\0')
63		53	use_cdpath = 0;
64		53	}
65
66		188	plist = *cdpathp;
67	✗✓	188	if (!plist)
68			use_cdpath = 0;
69	✓✓	188	else if (use_cdpath) {
70			char *pend;
71
72	✗✓✗✗	270	for (pend = plist; pend && pend != ':'; pend++)
73			;
74		135	plen = pend - plist;
75	✗✓	270	cdpathp = pend ? ++pend : NULL;
76		135	}
77
78	✗✓✗✗ ✓✗	376	if ((use_cdpath == 0 \|\| !plen \|\| plist[0] != '/') &&
79	✓✗	376	(cwd && *cwd)) {
80		188	len = strlen(cwd);
81	✗✓	188	XcheckN(*xsp, xp, len);
82		188	memcpy(xp, cwd, len);
83		188	xp += len;
84	✓✗	188	if (cwd[len - 1] != '/')
85		188	Xput(*xsp, xp, '/');
86			}
87		188	phys_pathp = Xlength(xsp, xp);
88	✗✓	188	if (use_cdpath && plen) {
89			XcheckN(*xsp, xp, plen);
90			memcpy(xp, plist, plen);
91			xp += plen;
92			if (plist[plen - 1] != '/')
93			Xput(*xsp, xp, '/');
94			rval = 1;
95			}
96			}
97
98		46230	len = strlen(file) + 1;
99	✗✓	46230	XcheckN(*xsp, xp, len);
100		46230	memcpy(xp, file, len);
101
102	✓✓	46230	if (!use_cdpath)
103		46095	*cdpathp = NULL;
104
105		46230	return rval;
106			}
107
108			/*
109			* Simplify pathnames containing "." and ".." entries.
110			* ie, simplify_path("/a/b/c/./../d/..") returns "/a/b"
111			*/
112			void
113			simplify_path(char *path)
114			{
115			char *cur;
116			char *t;
117			int isrooted;
118			char *very_start = path;
119			char *start;
120
121	✗✓	528000	if (!*path)
122			return;
123
124	✓✗	264000	if ((isrooted = (path[0] == '/')))
125		264000	very_start++;
126
127			/* Before After
128			* /foo/ /foo
129			* /foo/../../bar /bar
130			* /foo/./blah/.. /foo
131			* . .
132			* .. ..
133			* ./foo foo
134			* foo/../../../bar ../../bar
135			*/
136
137		264000	for (cur = t = start = very_start; ; ) {
138			/* treat multiple '/'s as one '/' */
139	✓✓	5579422	while (*t == '/')
140		1130870	t++;
141
142	✓✓	1658841	if (*t == '\0') {
143	✗✓	264000	if (cur == path)
144			/* convert empty path to dot */
145			*cur++ = '.';
146		264000	*cur = '\0';
147			break;
148			}
149
150	✓✓	1394841	if (t[0] == '.') {
151	✓✗✓✓	1424	if (!t[1] \|\| t[1] == '/') {
152			t += 1;
153		2	continue;
154	✓✗✓✓ ✓✗	2081	} else if (t[1] == '.' && (!t[2] \|\| t[2] == '/')) {
155	✗✓✗✗	710	if (!isrooted && cur == start) {
156			if (cur != very_start)
157			*cur++ = '/';
158			*cur++ = '.';
159			*cur++ = '.';
160			start = cur;
161	✓✗	710	} else if (cur != start)
162	✓✗✓✓	10078	while (--cur > start && *cur != '/')
163			;
164			t += 2;
165		710	continue;
166			}
167			}
168
169	✓✓	1394129	if (cur != very_start)
170		1130131	*cur++ = '/';
171
172			/* find/copy next component of pathname */
173	✓✓✓✓	22784389	while (t && t != '/')
174		6753351	cur++ = t++;
175			}
176		528000	}
177
178
179			void
180			set_current_wd(char *path)
181			{
182			int len;
183			char *p = path;
184
185	✓✓	536724	if (!p && !(p = ksh_get_wd(NULL, 0)))
186			p = null;
187
188		263999	len = strlen(p) + 1;
189
190	✓✓	263999	if (len > current_wd_size)
191		218099	current_wd = aresize(current_wd, current_wd_size = len, APERM);
192		263999	memcpy(current_wd, p, len);
193	✓✓	263999	if (p != path && p != null)
194		8726	afree(p, ATEMP);
195		263999	}
196
197			char *
198			get_phys_path(const char *path)
199			{
200			XString xs;
201			char *xp;
202
203			Xinit(xs, xp, strlen(path) + 1, ATEMP);
204
205			xp = do_phys_path(&xs, xp, path);
206
207			if (!xp)
208			return NULL;
209
210			if (Xlength(xs, xp) == 0)
211			Xput(xs, xp, '/');
212			Xput(xs, xp, '\0');
213
214			return Xclose(xs, xp);
215			}
216
217			static char *
218			do_phys_path(XString xsp, char xp, const char *path)
219			{
220			const char p, q;
221			int len, llen;
222			int savepos;
223			char lbuf[PATH_MAX];
224
225			Xcheck(*xsp, xp);
226			for (p = path; p; p = q) {
227			while (*p == '/')
228			p++;
229			if (!*p)
230			break;
231			len = (q = strchr(p, '/')) ? q - p : strlen(p);
232			if (len == 1 && p[0] == '.')
233			continue;
234			if (len == 2 && p[0] == '.' && p[1] == '.') {
235			while (xp > Xstring(*xsp, xp)) {
236			xp--;
237			if (*xp == '/')
238			break;
239			}
240			continue;
241			}
242
243			savepos = Xsavepos(*xsp, xp);
244			Xput(*xsp, xp, '/');
245			XcheckN(*xsp, xp, len + 1);
246			memcpy(xp, p, len);
247			xp += len;
248			*xp = '\0';
249
250			llen = readlink(Xstring(*xsp, xp), lbuf, sizeof(lbuf) - 1);
251			if (llen < 0) {
252			/* EINVAL means it wasn't a symlink... */
253			if (errno != EINVAL)
254			return NULL;
255			continue;
256			}
257			lbuf[llen] = '\0';
258
259			/* If absolute path, start from scratch.. */
260			xp = lbuf[0] == '/' ? Xstring(*xsp, xp) :
261			Xrestpos(*xsp, xp, savepos);
262			if (!(xp = do_phys_path(xsp, xp, lbuf)))
263			return NULL;
264			}
265			return xp;
266			}