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path - file path routines


#include <ast.h>

char* pathaccess(char*
path, const char* dirs, const char* a, const char* b, int mode); char* pathbin(void); char* pathcanon(char* path, int flags); char* pathcat(char* path, const char* dirs, int sep, const char* a, const char* b); char* pathcd(char* path, const char* home); int pathcheck(const char* package, const char* tool, Pathcheck_t* pc); int pathgetlink(const char* name, char* buf, int siz); char* pathkey(char* key, char* attr, const char* lang, const char* path); char* pathnext(char* path, char* extra, long* visits); char* pathpath(char* path, const char* p, const char* a, int mode); char* pathprobe(char* path, char* attr, const char* lang, const char* tool, const char* proc, int op); char* pathrepl(char* path, const char* match, const char* replace); int pathsetlink(const char* text, char* name); char* pathshell(void); int pathstat(const char* path, struct stat* st); char* pathtemp(char* path, const char* dir, const char* pfx);


These routines operate on file path names. Path buffers are assumed to be of size PATH_MAX <ast.h>always defines PATH_MAX even if it indeterminant on the local system. Yes, this was probably a bad choice, but it was made about 10 years ago. We will probably move to a <stk.h> based implementation.
pathaccessconstructs a path in pathto the file a/bwith access modeusing the :separated directories in dirs. Both a and b may be 0 modeis the inclusive-or of:
F_OKFile exists.
R_OKRead permission on file.
W_OKWrite permission on file.
X_OKExecute permission on file.
PATH_REGULARA regular file.
PATH_ABSOLUTEGenerated path name is rooted at / path is returned, 0 on error.
pathbinreturns a pointer to the :separated list of directories to search for executable commands. The PATHenvironment variable is first consulted. If not defined then confstr(_CS_PATH,...)is used. A valid string is always returned.
pathcanoncanonicalizes the path path in place. A pointer to the trailing 0 in the canonicalized path is returned. A canonical path has: redundant .and /removed; ..moved to the front; /..preserved for super root hacks; ...resolved if fs3d(3) is enabled. flags is the inclusive-or of:
PATH_DOTDOTEach checked for access.
PATH_EXISTSPath must exist at each component.
PATH_PHYSICALSymbolic links are resolved at each component.
0 is returned on error. If an error occurs and either of PATH_DOTDOTor PATH_EXISTSis set then path will contain the components following the failure point.
pathcatconcatenates the first sep separated path component in dirs with the path components a and b into path The path is constructed in path by separating each path component with /. Both a and b may be 0 A pointer to the next sep separated component in dirs is returned, 0when there are no more components. pathcatis used by pathaccess
pathcdsets the current working directory to path via chdir(2). If path is longer than PATH_MAXthen it is split up into a sequence of relative paths and chdir is called on each of these. For any given system, if you got to a directory, then pathcdcan get you back, modulo permission and link changes.
pathcheckis a stub for license libraries. See license(3).
pathgetlinkreturns the 0-terminated symbolic link text for path in the buffer bu of size siz. The link text length is returned on success, -1 on error. Weird universe (1) interactions with dynamic symbolic links are handled by converting non-standard dynamic link text to .../$( pathsetsymlinkconverts in the other direction.
pathkeygenerates in key a 14 character lookup key (plus terminating 0) for the language lang processor in path. A poihter to the key is returned, 0 on error. If key == 0 then space is allocated via malloc(3). Key specific attribute name=value pairs are copied into attr if attr != 0.
pathpathconstructs in path a path to p with access(2) mode mode using the directories from pathbin() If a != 0 then a, argv[0] (if available via optget(3)), and the _environment variable (set by ksh(1) ) are used for related root searching. If p also contains a /then ../p is searched for.
pathprobegenerates in path the full path name of the tool specific probe(1) information file for the lang langauge processor proc. If path == 0 then space is allocated via malloc(3). Probe attribute name=value pairs are copied into attr if attr != 0. op may be one of:
-1 return the path name with no access checks or generation
0 message emitted information must be generated via probe(1)
1 no message emitted information must be probed via probe(1)
0 is returned if the information does not exist and cannot be generated.
pathrepldoes an in-place replacement of the first occurrence of /match/ with /replace/ in path.
pathsetlinkcreates a symbolic link text in the path name. See pathgetlinkabove for weird universe(1) interactions hidden by this routine.
pathshellreturns a pointer to the pathname for the shell for the current process. The SHELLenvironment variable is first consulted, but is rejected under suspicious ownership/setuid conditions of if it seems to point to csh(1) ; otherwise confstr(_CS_SHELL,...)is used. A valid string is always returned.
pathstatfirst tries stat( and if that fails it tries lstat( The stator lstatreturn value is returned.
pathtempgenerates in path a temporary file path name of the form dir/pfx<pid>.<suf> where the length of pfx, if !=0, is limited to 5, the length of <pid> (the base 64 representation of the current process id) is limited to 3, and <suf> (an internally generated suffix that avoid file confilicts) is limited to 3. The generated path name conforms to the classic UNIX 14 char and the DOS 8.3 limitations. Both dir and pfx may be 0 access(2) is used to avoid file conflicts but the generated path name is not created, so you could lose in a race.
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