michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /*
michael@0: ** Pathname subroutines.
michael@0: */
michael@0: #include <assert.h>
michael@0: #if defined(FREEBSD) || defined(BSDI) || defined(DARWIN)
michael@0: #include <sys/types.h>
michael@0: #endif /* FREEBSD */
michael@0: #include <dirent.h>
michael@0: #include <errno.h>
michael@0: #include <stdarg.h>
michael@0: #include <stdio.h>
michael@0: #include <stdlib.h>
michael@0: #include <string.h>
michael@0: #include <unistd.h>
michael@0: #include <sys/types.h>
michael@0: #include <sys/stat.h>
michael@0: #include "pathsub.h"
michael@0: #ifdef USE_REENTRANT_LIBC
michael@0: #include "libc_r.h"
michael@0: #endif /* USE_REENTRANT_LIBC */
michael@0: 
michael@0: char *program;
michael@0: 
michael@0: void
michael@0: fail(char *format, ...)
michael@0: {
michael@0:     int error;
michael@0:     va_list ap;
michael@0: 
michael@0: #ifdef USE_REENTRANT_LIBC
michael@0:     R_STRERROR_INIT_R();
michael@0: #endif
michael@0: 
michael@0:     error = errno;
michael@0:     fprintf(stderr, "%s: ", program);
michael@0:     va_start(ap, format);
michael@0:     vfprintf(stderr, format, ap);
michael@0:     va_end(ap);
michael@0:     if (error) {
michael@0: 
michael@0: #ifdef USE_REENTRANT_LIBC
michael@0:     R_STRERROR_R(errno);
michael@0: 	fprintf(stderr, ": %s", r_strerror_r);
michael@0: #else
michael@0: 	fprintf(stderr, ": %s", strerror(errno));
michael@0: #endif
michael@0:     }
michael@0:  
michael@0:     putc('\n', stderr);
michael@0:     abort();
michael@0:     exit(1);
michael@0: }
michael@0: 
michael@0: char *
michael@0: getcomponent(char *path, char *name)
michael@0: {
michael@0:     if (*path == '\0')
michael@0: 	return 0;
michael@0:     if (*path == '/') {
michael@0: 	*name++ = '/';
michael@0:     } else {
michael@0: 	do {
michael@0: 	    *name++ = *path++;
michael@0: 	} while (*path != '/' && *path != '\0');
michael@0:     }
michael@0:     *name = '\0';
michael@0:     while (*path == '/')
michael@0: 	path++;
michael@0:     return path;
michael@0: }
michael@0: 
michael@0: #ifdef UNIXWARE
michael@0: /* The static buffer in Unixware's readdir is too small. */
michael@0: struct dirent * readdir(DIR *d)
michael@0: {
michael@0:     static struct dirent *buf = NULL;
michael@0: #define MAX_PATH_LEN 1024
michael@0: 
michael@0:     if (buf == NULL)
michael@0: 	buf = (struct dirent *)xmalloc(sizeof(struct dirent) + MAX_PATH_LEN) ;
michael@0:     return readdir_r(d, buf);
michael@0: }
michael@0: #endif
michael@0: 
michael@0: /* APPARENT BUG - ignores argument "dir", uses ".." instead. */
michael@0: char *
michael@0: ino2name(ino_t ino, char *dir)
michael@0: {
michael@0:     DIR *dp;
michael@0:     struct dirent *ep;
michael@0:     char *name;
michael@0: 
michael@0:     dp = opendir("..");		/* XXX */
michael@0:     if (!dp)
michael@0: 	fail("cannot read parent directory");
michael@0:     for (;;) {
michael@0: 	if (!(ep = readdir(dp)))
michael@0: 	    fail("cannot find current directory");
michael@0: 	if (ep->d_ino == ino)
michael@0: 	    break;
michael@0:     }
michael@0:     name = xstrdup(ep->d_name);
michael@0:     closedir(dp);
michael@0:     return name;
michael@0: }
michael@0: 
michael@0: void *
michael@0: xmalloc(size_t size)
michael@0: {
michael@0:     void *p;
michael@0: 
michael@0:     if (size <= 0)
michael@0: 	fail("attempted to allocate %u bytes", size);
michael@0:     p = malloc(size);
michael@0:     if (!p)
michael@0: 	fail("cannot allocate %u bytes", size);
michael@0:     return p;
michael@0: }
michael@0: 
michael@0: char *
michael@0: xstrdup(char *s)
michael@0: {
michael@0:     if (!s || !s[0]) 
michael@0: 	fail("Null pointer or empty string passed to xstrdup()");
michael@0:     return strcpy((char*)xmalloc(strlen(s) + 1), s);
michael@0: }
michael@0: 
michael@0: char *
michael@0: xbasename(char *path)
michael@0: {
michael@0:     char *cp;
michael@0: 
michael@0:     if (!path || !path[0]) 
michael@0: 	fail("Null pointer or empty string passed to xbasename()");
michael@0:     while ((cp = strrchr(path, '/')) && cp[1] == '\0')
michael@0: 	*cp = '\0';
michael@0:     if (!cp) return path;
michael@0:     return cp + 1;
michael@0: }
michael@0: 
michael@0: void
michael@0: xchdir(char *dir)
michael@0: {
michael@0:     if (!dir || !dir[0]) 
michael@0: 	fail("Null pointer or empty string passed to xchdir()");
michael@0:     if (chdir(dir) < 0)
michael@0: 	fail("cannot change directory to %s", dir);
michael@0: }
michael@0: 
michael@0: int
michael@0: relatepaths(char *from, char *to, char *outpath)
michael@0: {
michael@0:     char *cp, *cp2;
michael@0:     int len;
michael@0:     char buf[NAME_MAX];
michael@0: 
michael@0:     assert(*from == '/' && *to == '/');
michael@0:     if (!from || *from != '/')
michael@0: 	fail("relatepaths: from path does not start with /");
michael@0:     if (!to || *to != '/')
michael@0: 	fail("relatepaths: to   path does not start with /");
michael@0: 
michael@0:     for (cp = to, cp2 = from; *cp == *cp2; cp++, cp2++)
michael@0: 	if (*cp == '\0')
michael@0: 	    break;
michael@0:     while (cp[-1] != '/')
michael@0: 	cp--, cp2--;
michael@0:     if (cp - 1 == to) {
michael@0: 	/* closest common ancestor is /, so use full pathname */
michael@0: 	len = strlen(strcpy(outpath, to));
michael@0: 	if (outpath[len] != '/') {
michael@0: 	    outpath[len++] = '/';
michael@0: 	    outpath[len] = '\0';
michael@0: 	}
michael@0:     } else {
michael@0: 	len = 0;
michael@0: 	while ((cp2 = getcomponent(cp2, buf)) != 0) {
michael@0: 	    strcpy(outpath + len, "../");
michael@0: 	    len += 3;
michael@0: 	}
michael@0: 	while ((cp = getcomponent(cp, buf)) != 0) {
michael@0: 	    sprintf(outpath + len, "%s/", buf);
michael@0: 	    len += strlen(outpath + len);
michael@0: 	}
michael@0:     }
michael@0:     return len;
michael@0: }
michael@0: 
michael@0: void
michael@0: reversepath(char *inpath, char *name, int len, char *outpath)
michael@0: {
michael@0:     char *cp, *cp2;
michael@0:     char buf[NAME_MAX];
michael@0:     struct stat sb;
michael@0: 
michael@0:     cp = strcpy(outpath + PATH_MAX - (len + 1), name);
michael@0:     cp2 = inpath;
michael@0:     while ((cp2 = getcomponent(cp2, buf)) != 0) {
michael@0: 	if (strcmp(buf, ".") == 0)
michael@0: 	    continue;
michael@0: 	if (strcmp(buf, "..") == 0) {
michael@0: 	    if (stat(".", &sb) < 0)
michael@0: 		fail("cannot stat current directory");
michael@0: 	    name = ino2name(sb.st_ino, "..");
michael@0: 	    len = strlen(name);
michael@0: 	    cp -= len + 1;
michael@0: 	    strcpy(cp, name);
michael@0: 	    cp[len] = '/';
michael@0: 	    free(name);
michael@0: 	    xchdir("..");
michael@0: 	} else {
michael@0: 	    cp -= 3;
michael@0: 	    strncpy(cp, "../", 3);
michael@0: 	    xchdir(buf);
michael@0: 	}
michael@0:     }
michael@0:     strcpy(outpath, cp);
michael@0: }
michael@0: 
michael@0: void
michael@0: diagnosePath(const char * path)
michael@0: {
michael@0:     char *	myPath;
michael@0:     char *      slash;
michael@0:     int		rv;
michael@0:     struct stat sb;
michael@0:     char 	buf[BUFSIZ];
michael@0: 
michael@0:     if (!path || !path[0]) 
michael@0: 	fail("Null pointer or empty string passed to mkdirs()");
michael@0:     myPath = strdup(path);
michael@0:     if (!myPath)
michael@0: 	fail("strdup() failed!");
michael@0:     do {
michael@0:     	rv = lstat(myPath, &sb);
michael@0: 	if (rv < 0) {
michael@0: 	    perror(myPath);
michael@0: 	} else if (S_ISLNK(sb.st_mode)) {
michael@0: 	    rv = readlink(myPath, buf, sizeof(buf) - 1);
michael@0: 	    if (rv < 0) {
michael@0: 	    	perror("readlink");
michael@0: 		buf[0] = 0;
michael@0: 	    } else {
michael@0: 	    	buf[rv] = 0;
michael@0: 	    }
michael@0: 	    fprintf(stderr, "%s is a link to %s\n", myPath, buf);
michael@0: 	} else if (S_ISDIR(sb.st_mode)) {
michael@0: 	    fprintf(stderr, "%s is a directory\n", myPath);
michael@0: 	    rv = access(myPath, X_OK);
michael@0: 	    if (rv < 0) {
michael@0: 	    	fprintf(stderr, "%s: no search permission\n", myPath);
michael@0: 	    }
michael@0: 	} else {
michael@0: 	    fprintf(stderr, "%s is a file !?!\n", myPath);
michael@0: 	    rv = access(myPath, F_OK);
michael@0: 	    if (rv < 0) {
michael@0: 	    	fprintf(stderr, "%s does not exist\n", myPath);
michael@0: 	    }
michael@0: 	}
michael@0: 
michael@0: 	/* chop path off one level. */
michael@0: 	slash = strrchr(myPath, '/');
michael@0: 	if (!slash)
michael@0: 	    slash = strrchr(myPath, '\\');
michael@0: 	if (!slash)
michael@0: 	    slash = myPath;
michael@0: 	*slash = 0;
michael@0:     } while (myPath[0]);
michael@0:     free(myPath);
michael@0: }