src/common/getpath.c

#ifndef lint
static const char       RCSid[] = "$Id: getpath.c,v 2.14 2003/07/17 09:21:29 schorsch Exp $";
#endif
/*
 *  getpath.c - function to search for file in a list of directories
 *
 *  External symbols declared in standard.h
 */

#include "copyright.h"

#include  <string.h>
#include  <ctype.h>

#include  "paths.h"
#include  "rtio.h"


#ifdef _WIN32
static char *
core_getpath    /* wrapped below: expand fname, return full path */
#else
char *
getpath /* expand fname, return full path */
#endif
(
register char  *fname,
register char  *searchpath,
int  mode
)
{
        static char  pname[PATH_MAX];
        char uname[512];
        register char  *cp;
        int i;

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

        pname[0] = '\0';                /* check for full specification */

        if (ISABS(fname)) { /* absolute path */
                strncpy(pname, fname, sizeof(pname)-1);
        } else {
                switch (*fname) {
                        case '.':                               /* relative to cwd */
                                strncpy(pname, fname, sizeof(pname)-1);
                                break;
                        case '~':                               /* relative to home directory */
                                fname++;
                                cp = uname;
                                for (i=0;i<sizeof(uname)&&*fname!='\0'&&!ISDIRSEP(*fname);i++)
                                        *cp++ = *fname++;
                                *cp = '\0';
                                cp = gethomedir(uname, pname, sizeof(pname));
                                if(cp == NULL) return NULL;
                                strncat(pname, fname, sizeof(pname)-strlen(pname)-1);
                                break;
                }
        }
        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 */
                strncpy(pname, fname, sizeof(pname)-1);
                return(pname);
        }
        /* check search path */
        do {
                cp = pname;
                while (*searchpath && (*cp = *searchpath++) != PATHSEP) {
                        cp++;
                }
                if (cp > pname && !ISDIRSEP(cp[-1])) {
                        *cp++ = DIRSEP;
                }
                strncpy(cp, fname, sizeof(pname)-strlen(pname)-1);
                if (access(pname, mode) == 0)           /* file accessable? */
                        return(pname);
        } while (*searchpath);
        /* not found */
        return(NULL);
}


#ifdef _WIN32
/* This is a wrapper around the above, "emulating" access mode X_OK,
   which is not supported on Windows.
   If we see X_OK and the filename has no extension, then we'll remove
   the X_OK from the mode, append ".exe" to the file name, and search
   with the resulting string. If that fails, we'll try again with ".bat".
   Theoretically, we might still not have execute rights on a file we find
   like this, but that's rare enough not to be worth checking the ACLs.
*/
char *
getpath(        /* expand fname, return full path */
register char  *ffname,
register char  *searchpath,
int  mode
)
{
        register char  *cp;
        char fname[PATH_MAX];

        if (ffname == NULL)
                return(NULL);

        /* if we have a dot in the string, we assume there is a file name
           extension present */
        /* XXX We'd better test for .exe/.bat/.etc explicitly */
        if (!(mode & X_OK) || (strrchr(ffname, '.') != NULL)) {
                return core_getpath(ffname, searchpath, mode);
        }

        /* We're looking for an executable, Windows doesn't have X_OK. */
        mode &= ~X_OK;
        /* Append .exe */
        strncpy(fname, ffname, sizeof(fname)-5);
        strcat(fname, ".exe");
        cp = core_getpath(fname, searchpath, mode);
        if (cp != NULL) return cp;

        /* Try with .bat this time... */
        strncpy(fname, ffname, sizeof(fname)-5);
        strcat(fname, ".bat");
        cp = core_getpath(fname, searchpath, mode);
        return cp;
}
#endif /* _WIN32 */


#ifdef TEST_MODULE
int main()
{
        char * fp;
        char fmt[] = "%15s %-10s %s: %s\n";

        fp = getpath("rayinit.cal", getenv("RAYPATH"), R_OK);
        printf(fmt,  "rayinit.cal",        "RAYPATH", "R_OK", fp);
        fp = getpath("mkillum", getenv("PATH"), X_OK);
        printf(fmt,  "mkillum",        "PATH", "X_OK", fp);
        fp = getpath("/", getenv("PATH"), W_OK);
        printf(fmt,  "/",        "PATH", "W_OK", fp);
        fp = getpath("~", getenv("PATH"), F_OK);
        printf(fmt,  "~",        "PATH", "F_OK", fp);
        printf("Undefining HOME and HOMEPATH\n");
        unsetenv("HOME");
        unsetenv("HOMEPATH");
        fp = getpath("~", getenv("PATH"), F_OK);
        printf(fmt,  "~",        "PATH", "F_OK", fp);
        fp = getpath("~lp/blah", getenv("PATH"), F_OK);
        printf(fmt, "~lp/blah",         "PATH", "F_OK", fp);
}
#endif

Revision:	2.15
Committed:	Mon Oct 27 10:19:31 2003 UTC (20 years, 6 months ago) by schorsch
Content type:	text/plain
Branch:	MAIN
Changes since 2.14:	+12 -38 lines
Log Message:	Added gethomedir.c and various compatibility fixes.
#	User	Rev	Content
1	greg	1.1	#ifndef lint
2	schorsch	2.15	static const char RCSid[] = "$Id: getpath.c,v 2.14 2003/07/17 09:21:29 schorsch Exp $";
3	greg	1.1	#endif
4			/*
5			* getpath.c - function to search for file in a list of directories
6	greg	2.9	*
7			* External symbols declared in standard.h
8			*/
9
10	greg	2.10	#include "copyright.h"
11	greg	1.1
12	schorsch	2.11	#include <string.h>
13			#include <ctype.h>
14	greg	2.7
15	greg	2.6	#include "paths.h"
16	schorsch	2.14	#include "rtio.h"
17	greg	1.1
18
19	schorsch	2.11	#ifdef _WIN32
20			static char *
21			core_getpath /* wrapped below: expand fname, return full path */
22			#else
23	greg	1.1	char *
24	schorsch	2.11	getpath /* expand fname, return full path */
25			#endif
26			(
27			register char *fname,
28			register char *searchpath,
29			int mode
30			)
31	greg	1.1	{
32	schorsch	2.11	static char pname[PATH_MAX];
33	schorsch	2.15	char uname[512];
34	greg	1.1	register char *cp;
35	schorsch	2.15	int i;
36	greg	1.1
37	schorsch	2.11	if (fname == NULL) { return(NULL); }
38	greg	1.1
39	greg	2.8	pname[0] = '\0'; /* check for full specification */
40	schorsch	2.11
41	schorsch	2.15	if (ISABS(fname)) { /* absolute path */
42	schorsch	2.11	strncpy(pname, fname, sizeof(pname)-1);
43			} else {
44			switch (*fname) {
45			case '.': /* relative to cwd */
46			strncpy(pname, fname, sizeof(pname)-1);
47			break;
48			case '~': /* relative to home directory */
49			fname++;
50	schorsch	2.15	cp = uname;
51			for (i=0;i<sizeof(uname)&&fname!='\0'&&!ISDIRSEP(fname);i++)
52	schorsch	2.11	cp++ = fname++;
53			*cp = '\0';
54	schorsch	2.15	cp = gethomedir(uname, pname, sizeof(pname));
55			if(cp == NULL) return NULL;
56	schorsch	2.11	strncat(pname, fname, sizeof(pname)-strlen(pname)-1);
57			break;
58	greg	1.1	}
59			}
60	greg	2.8	if (pname[0]) /* got it, check access if search requested */
61			return(searchpath==NULL\|\|access(pname,mode)==0 ? pname : NULL);
62	greg	1.1
63			if (searchpath == NULL) { /* don't search */
64	schorsch	2.11	strncpy(pname, fname, sizeof(pname)-1);
65	greg	1.1	return(pname);
66			}
67	schorsch	2.11	/* check search path */
68	greg	1.1	do {
69			cp = pname;
70	schorsch	2.11	while (searchpath && (cp = *searchpath++) != PATHSEP) {
71	greg	2.3	cp++;
72	schorsch	2.11	}
73			if (cp > pname && !ISDIRSEP(cp[-1])) {
74	greg	2.3	*cp++ = DIRSEP;
75	schorsch	2.11	}
76			strncpy(cp, fname, sizeof(pname)-strlen(pname)-1);
77	greg	1.1	if (access(pname, mode) == 0) /* file accessable? */
78			return(pname);
79			} while (*searchpath);
80	schorsch	2.11	/* not found */
81	greg	1.1	return(NULL);
82			}
83	schorsch	2.11
84
85			#ifdef _WIN32
86			/* This is a wrapper around the above, "emulating" access mode X_OK,
87			which is not supported on Windows.
88			If we see X_OK and the filename has no extension, then we'll remove
89			the X_OK from the mode, append ".exe" to the file name, and search
90			with the resulting string. If that fails, we'll try again with ".bat".
91			Theoretically, we might still not have execute rights on a file we find
92			like this, but that's rare enough not to be worth checking the ACLs.
93			*/
94			char *
95			getpath( /* expand fname, return full path */
96			register char *ffname,
97			register char *searchpath,
98			int mode
99			)
100			{
101			register char *cp;
102			char fname[PATH_MAX];
103
104			if (ffname == NULL)
105			return(NULL);
106
107			/* if we have a dot in the string, we assume there is a file name
108			extension present */
109			/* XXX We'd better test for .exe/.bat/.etc explicitly */
110			if (!(mode & X_OK) \|\| (strrchr(ffname, '.') != NULL)) {
111			return core_getpath(ffname, searchpath, mode);
112			}
113
114			/* We're looking for an executable, Windows doesn't have X_OK. */
115			mode &= ~X_OK;
116			/* Append .exe */
117			strncpy(fname, ffname, sizeof(fname)-5);
118			strcat(fname, ".exe");
119			cp = core_getpath(fname, searchpath, mode);
120			if (cp != NULL) return cp;
121
122			/* Try with .bat this time... */
123			strncpy(fname, ffname, sizeof(fname)-5);
124			strcat(fname, ".bat");
125			cp = core_getpath(fname, searchpath, mode);
126			return cp;
127			}
128			#endif /* _WIN32 */
129
130
131			#ifdef TEST_MODULE
132			int main()
133			{
134			char * fp;
135			char fmt[] = "%15s %-10s %s: %s\n";
136
137			fp = getpath("rayinit.cal", getenv("RAYPATH"), R_OK);
138			printf(fmt, "rayinit.cal", "RAYPATH", "R_OK", fp);
139			fp = getpath("mkillum", getenv("PATH"), X_OK);
140			printf(fmt, "mkillum", "PATH", "X_OK", fp);
141			fp = getpath("/", getenv("PATH"), W_OK);
142			printf(fmt, "/", "PATH", "W_OK", fp);
143			fp = getpath("~", getenv("PATH"), F_OK);
144			printf(fmt, "~", "PATH", "F_OK", fp);
145	schorsch	2.15	printf("Undefining HOME and HOMEPATH\n");
146	schorsch	2.11	unsetenv("HOME");
147	schorsch	2.15	unsetenv("HOMEPATH");
148	schorsch	2.11	fp = getpath("~", getenv("PATH"), F_OK);
149			printf(fmt, "~", "PATH", "F_OK", fp);
150	schorsch	2.15	fp = getpath("~lp/blah", getenv("PATH"), F_OK);
151			printf(fmt, "~lp/blah", "PATH", "F_OK", fp);
152	schorsch	2.11	}
153			#endif
154