src/common/getpath.c

#ifndef lint
static const char       RCSid[] = "$Id$";
#endif
/*
 *  getpath.c - function to search for file in a list of directories
 *
 *  External symbols declared in standard.h
 */

/* ====================================================================
 * The Radiance Software License, Version 1.0
 *
 * Copyright (c) 1990 - 2002 The Regents of the University of California,
 * through Lawrence Berkeley National Laboratory.   All rights reserved.
 *
 * 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. The end-user documentation included with the redistribution,
 *           if any, must include the following acknowledgment:
 *             "This product includes Radiance software
 *                 (http://radsite.lbl.gov/)
 *                 developed by the Lawrence Berkeley National Laboratory
 *               (http://www.lbl.gov/)."
 *       Alternately, this acknowledgment may appear in the software itself,
 *       if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
 *       and "The Regents of the University of California" must
 *       not be used to endorse or promote products derived from this
 *       software without prior written permission. For written
 *       permission, please contact [email protected].
 *
 * 5. Products derived from this software may not be called "Radiance",
 *       nor may "Radiance" appear in their name, without prior written
 *       permission of Lawrence Berkeley National Laboratory.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 Lawrence Berkeley National Laboratory OR
 * ITS 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.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Lawrence Berkeley National Laboratory.   For more
 * information on Lawrence Berkeley National Laboratory, please see
 * <http://www.lbl.gov/>.
 */

#include  "standard.h"

#include  "paths.h"

#ifndef  NIX
#include  <pwd.h>
extern struct passwd  *getpwnam();
#endif


char *
getpath(fname, searchpath, mode)        /* expand fname, return full path */
register char  *fname;
register char  *searchpath;
int  mode;
{
#ifndef  NIX
        struct passwd  *pwent;
#endif
        static char  pname[MAXPATH];
        register char  *cp;

        if (fname == NULL)
                return(NULL);

        pname[0] = '\0';                /* check for full specification */
        switch (*fname) {
        CASEDIRSEP:                             /* relative to root */
        case '.':                               /* relative to cwd */
                strcpy(pname, fname);
                break;
#ifndef NIX
        case '~':                               /* relative to home directory */
                fname++;
                if (*fname == '\0' || ISDIRSEP(*fname)) {       /* ours */
                        if ((cp = getenv("HOME")) == NULL)
                                return(NULL);
                        strcpy(pname, cp);
                        strcat(pname, fname);
                        break;
                }
                cp = pname;                                     /* user */
                do
                        *cp++ = *fname++;
                while (*fname && !ISDIRSEP(*fname));
                *cp = '\0';
                if ((pwent = getpwnam(pname)) == NULL)
                        return(NULL);
                strcpy(pname, pwent->pw_dir);
                strcat(pname, fname);
                break;
#endif
        }
        if (pname[0])           /* got it, check access if search requested */
                return(searchpath==NULL||access(pname,mode)==0 ? pname : NULL);

        if (searchpath == NULL) {                       /* don't search */
                strcpy(pname, fname);
                return(pname);
        }
                                                        /* check search path */
        do {
                cp = pname;
                while (*searchpath && (*cp = *searchpath++) != PATHSEP)
                        cp++;
                if (cp > pname && !ISDIRSEP(cp[-1]))
                        *cp++ = DIRSEP;
                strcpy(cp, fname);
                if (access(pname, mode) == 0)           /* file accessable? */
                        return(pname);
        } while (*searchpath);
                                                        /* not found */
        return(NULL);
}
Revision:	2.9
Committed:	Sat Feb 22 02:07:22 2003 UTC (21 years, 2 months ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 2.8:	+60 -4 lines
Log Message:	Changes and check-in for 3.5 release Includes new source files and modifications not recorded for many years See ray/doc/notes/ReleaseNotes for notes between 3.1 and 3.5 release
#	Content
1	#ifndef lint
2	static const char RCSid[] = "$Id$";
3	#endif
4	/*
5	* getpath.c - function to search for file in a list of directories
6	*
7	* External symbols declared in standard.h
8	*/
9
10	/* ====================================================================
11	* The Radiance Software License, Version 1.0
12	*
13	* Copyright (c) 1990 - 2002 The Regents of the University of California,
14	* through Lawrence Berkeley National Laboratory. All rights reserved.
15	*
16	* Redistribution and use in source and binary forms, with or without
17	* modification, are permitted provided that the following conditions
18	* are met:
19	*
20	* 1. Redistributions of source code must retain the above copyright
21	* notice, this list of conditions and the following disclaimer.
22	*
23	* 2. Redistributions in binary form must reproduce the above copyright
24	* notice, this list of conditions and the following disclaimer in
25	* the documentation and/or other materials provided with the
26	* distribution.
27	*
28	* 3. The end-user documentation included with the redistribution,
29	* if any, must include the following acknowledgment:
30	* "This product includes Radiance software
31	* (http://radsite.lbl.gov/)
32	* developed by the Lawrence Berkeley National Laboratory
33	* (http://www.lbl.gov/)."
34	* Alternately, this acknowledgment may appear in the software itself,
35	* if and wherever such third-party acknowledgments normally appear.
36	*
37	* 4. The names "Radiance," "Lawrence Berkeley National Laboratory"
38	* and "The Regents of the University of California" must
39	* not be used to endorse or promote products derived from this
40	* software without prior written permission. For written
41	* permission, please contact [email protected].
42	*
43	* 5. Products derived from this software may not be called "Radiance",
44	* nor may "Radiance" appear in their name, without prior written
45	* permission of Lawrence Berkeley National Laboratory.
46	*
47	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
48	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
49	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
50	* DISCLAIMED. IN NO EVENT SHALL Lawrence Berkeley National Laboratory OR
51	* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
52	* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
53	* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
54	* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
55	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
56	* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
57	* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58	* SUCH DAMAGE.
59	* ====================================================================
60	*
61	* This software consists of voluntary contributions made by many
62	* individuals on behalf of Lawrence Berkeley National Laboratory. For more
63	* information on Lawrence Berkeley National Laboratory, please see
64	* <http://www.lbl.gov/>.
65	*/
66
67	#include "standard.h"
68
69	#include "paths.h"
70
71	#ifndef NIX
72	#include <pwd.h>
73	extern struct passwd *getpwnam();
74	#endif
75
76
77	char *
78	getpath(fname, searchpath, mode) /* expand fname, return full path */
79	register char *fname;
80	register char *searchpath;
81	int mode;
82	{
83	#ifndef NIX
84	struct passwd *pwent;
85	#endif
86	static char pname[MAXPATH];
87	register char *cp;
88
89	if (fname == NULL)
90	return(NULL);
91
92	pname[0] = '\0'; /* check for full specification */
93	switch (*fname) {
94	CASEDIRSEP: /* relative to root */
95	case '.': /* relative to cwd */
96	strcpy(pname, fname);
97	break;
98	#ifndef NIX
99	case '~': /* relative to home directory */
100	fname++;
101	if (fname == '\0' \|\| ISDIRSEP(fname)) { /* ours */
102	if ((cp = getenv("HOME")) == NULL)
103	return(NULL);
104	strcpy(pname, cp);
105	strcat(pname, fname);
106	break;
107	}
108	cp = pname; /* user */
109	do
110	cp++ = fname++;
111	while (fname && !ISDIRSEP(fname));
112	*cp = '\0';
113	if ((pwent = getpwnam(pname)) == NULL)
114	return(NULL);
115	strcpy(pname, pwent->pw_dir);
116	strcat(pname, fname);
117	break;
118	#endif
119	}
120	if (pname[0]) /* got it, check access if search requested */
121	return(searchpath==NULL\|\|access(pname,mode)==0 ? pname : NULL);
122
123	if (searchpath == NULL) { /* don't search */
124	strcpy(pname, fname);
125	return(pname);
126	}
127	/* check search path */
128	do {
129	cp = pname;
130	while (searchpath && (cp = *searchpath++) != PATHSEP)
131	cp++;
132	if (cp > pname && !ISDIRSEP(cp[-1]))
133	*cp++ = DIRSEP;
134	strcpy(cp, fname);
135	if (access(pname, mode) == 0) /* file accessable? */
136	return(pname);
137	} while (*searchpath);
138	/* not found */
139	return(NULL);
140	}