diff options
| -rw-r--r-- | lisplib.c | 2 | ||||
| -rw-r--r-- | stdlib/doc-syms.tl | 1 | ||||
| -rw-r--r-- | stdlib/path-test.tl | 13 | ||||
| -rw-r--r-- | tests/018/path-test.tl | 15 | ||||
| -rw-r--r-- | txr.1 | 73 |
5 files changed, 103 insertions, 1 deletions
@@ -189,7 +189,7 @@ static val path_test_set_entries(val dlt, val fun) lit("path-newer"), lit("path-older"), lit("path-same-object"), lit("path-private-to-me-p"), lit("path-strictly-private-to-me-p"), - lit("path-dir-empty"), + lit("path-dir-empty"), lit("path-search"), nil }; diff --git a/stdlib/doc-syms.tl b/stdlib/doc-syms.tl index cce921a1..90d8bd07 100644 --- a/stdlib/doc-syms.tl +++ b/stdlib/doc-syms.tl @@ -1372,6 +1372,7 @@ ("path-read-writable-to-me-p" "N-028A5109") ("path-readable-to-me-p" "N-02933008") ("path-same-object" "N-0103E27B") + ("path-search" "N-01AB7247") ("path-sep-chars" "N-03985DE5") ("path-setgid-p" "N-02FBA677") ("path-setuid-p" "N-02FBA677") diff --git a/stdlib/path-test.tl b/stdlib/path-test.tl index fb132f7f..b3483962 100644 --- a/stdlib/path-test.tl +++ b/stdlib/path-test.tl @@ -185,3 +185,16 @@ (casequal ent (("." "..")) (t (return nil)))))))) + +(defun path-search (name : (path (getenv "PATH"))) + (if (empty name) + nil + (let ((pcomp (if (listp path) + path + (spl (if (starts-with "CYGNAL" (uname).sysname) #\; #\:) + path)))) + (each ((pc pcomp)) + (if (nequal pc "") + (let ((st (ignerr (stat (path-cat pc name))))) + (if (and st (path-executable-to-me-p st) (path-file-p st)) + (return st.path)))))))) diff --git a/tests/018/path-test.tl b/tests/018/path-test.tl new file mode 100644 index 00000000..2b4e1717 --- /dev/null +++ b/tests/018/path-test.tl @@ -0,0 +1,15 @@ +(load "../common") + +(mtest + (path-search "sh") "/bin/sh" + (path-search "AlMoStCeRtAiNlLyNoNeXisTenT") nil + (path-search "") nil + (path-search "sh" nil) nil + (path-search "sh" '("AlMoStCeRtAiNlLyNoNeXisTenT")) nil + (path-search "sh" '("AlMoStCeRtAiNlLyNoNeXisTenT" "/bin")) "/bin/sh" + (path-search "sh" '("/bin")) "/bin/sh" + (path-search "sh" "AlMoStCeRtAiNlLyNoNeXisTenT") nil + (path-search "sh" "AlMoStCeRtAiNlLyNoNeXisTenT:/bin") "/bin/sh" + (path-search "sh" "/bin") "/bin/sh" + (path-search "sh" "/bin/") "/bin/sh" + (path-search "sh" ":/bin/") "/bin/sh") @@ -67107,6 +67107,79 @@ and resolve to the same filesystem object: the same inode number on the same device. +.coNP Function @ path-search +.synb +.mets (path-search < program-name <> [ search-path ]) +.syne +.desc +The +.code path-search +searches for an executable program whose name is given by the +.meta program-name +string argument. If the program is found, then the full path to that +program is returned, otherwise +.code nil +is returned. + +If the +.meta search-path +is omitted, then +.code path-search +uses the search path given in the +.code PATH +environment variable. This path is decomposed into components according +to the separator character, which may be +.code : +(colon) +or +.code ; +(semicolon) depending on the system. Then, for each component of the path, +.code path-search +affixes the +.meta program-name +to that component, as if using the +.code path-cat +function, and tests whether the resulting path is an existing file object +according to +.codn path-file-p , +which is executable according to +.codn path-executable-to-me-p . + +The +.code search-path +argument may be specified as a string, which is taken instead of the value +of the +.code PATH +environment variable, and decomposed into components in the same way. +The argument may also be specified as a list of strings, which are taken +to be components of a search path, and used as-is. + +If +.meta program-name +is the empty string or the search path is empty, the function returns +.codn nil . + +Components of the search path which are empty strings are ignored. + +If +.meta program-name +is a string which includes path separator characters, or if +.meta program-name +is one of the special names +.str . +or +.strn .. , +the behavior may produce a different result from the host platform's native +path search strategy. + +The behavior of +.code path-search +may also deviate from the host platform's native path search strategy +due to issues of permissions. If an executable file is found in the path, +but is not executable to the caller due to permissions, it is treated +as nonexistent, which means that the search can find a same-named file +later in the search path. + .SS* Unix Credentials .coNP Functions @, getuid @, geteuid @ getgid and @ getegid |