130 lines
3.3 KiB
C
130 lines
3.3 KiB
C
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/*
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* Copyright (c) 1989, 1990 by the University of Washington
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* Copyright (c) 1993 by the University of Southern California
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*
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* For copying and distribution information, please see the files
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* <uw-copyright.h> and <usc-copyr.h>
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*/
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#include <uw-copyright.h>
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#include <usc-copyr.h>
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#include <stdio.h>
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#include <string.h>
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#include <pfs.h>
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#include <perrno.h>
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#include <pmachine.h>
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static VLINK rd_vslink();
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/*
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* rd_vlink will read the named link, expanding any symbolic links
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* along the way. Call rd_slink if you do not want to expand the
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* final sym_link.
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*/
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VLINK
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rd_vlink(const char *path)
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{
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return(rd_vslink(path,SYMLINK_NESTING));
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}
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/*
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* rd_slink will read the named link, returing the result without
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* expansion, even if the result is a symbolic link.
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*/
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VLINK
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rd_slink(const char *path)
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{
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return(rd_vslink(path,-1));
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}
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extern char *p_uln_lastcomp_to_linkname(const char *s);
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static VLINK
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rd_vslink(path,depth)
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const char *path; /* Pathname for links to be returned */
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int depth; /* How many levels of sym links to expand */
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{
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char pth[MAX_VPATH]; /* Working copy of pathname */
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char *p = pth; /* So we can use it as a pointer */
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char *c; /* Component part of name */
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char *d; /* Directory part of name */
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char *slash; /* Position of slash */
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char *colon; /* Position of colon */
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int flags;
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VDIR_ST dir_st;
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VDIR dir = &dir_st;
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VLINK v;
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vdir_init(dir);
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/* special case just a . as a name for the current working directory,
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by mapping it onto the empty string. . */
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if (strequal(path, ".")) ++path;
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strcpy(p,path);
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d = p;
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slash = p_uln_rindex(p,'/');
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colon = p_uln_rindex(p,':');
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if(colon && (!slash || (colon > slash))) {
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*(colon + 1) = '\0';
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c = p_uln_lastcomp_to_linkname(p_uln_rindex(path,':') + 1);
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}
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else if(slash) {
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if(slash == p) d = "/";
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*slash = '\0';
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c = p_uln_lastcomp_to_linkname(slash + 1);
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}
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else if (strequal(path, "..")) {
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/* Special case just .. as a name for the superior directory. */
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d = "..";
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c = NULL;
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} else {
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d = "";
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c = p_uln_lastcomp_to_linkname(p);
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}
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if(c && *c) flags = RVD_FIND;
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else flags = RVD_DFILE_ONLY;
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perrno = rd_vdir(d,c,dir,flags);
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if(perrno || !dir->links) {
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if (!perrno) perrno = PFAILURE;
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vllfree(dir->links);
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vllfree(dir->ulinks);
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return(NULL);
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}
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vllfree(dir->ulinks);
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if((strncmp(dir->links->target,"SYMBOLIC",8) == 0) &&
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(strncmp(dir->links->hosttype,"VIRTUAL-SYSTEM",14) == 0)) {
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if(depth > 0) {
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if (sizeof pth <
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qsprintf(pth, sizeof pth,
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"/VIRTUAL-SYSTEMS/%s/ROOT%s%s",dir->links->host,
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((*(dir->links->hsoname) == '/') ? "" : "/"),
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dir->links->hsoname))
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internal_error("pth too small!");
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v = rd_vslink(pth,depth-1);
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vllfree(dir->links);
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if (!perrno) perrno = PFAILURE;
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return(v);
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}
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else if(depth == 0) {
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vllfree(dir->links);
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perrno = PFS_SYMLINK_DEPTH;
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return(NULL);
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} /* depth < 0 means don't expand symlink. */
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}
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return(dir->links);
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}
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