[PATCH 1/2] Get rid of superfluous variables in stem tracking

[Jouke Witteveen]

---
Some minor things I came across when working on a fix for [SV 54161],
which I'll send next.

Sure, the comments say that we should get rid of stem_str, but the
reality is that this variable is probably here to stay. Using it for
constructing the stem makes the kinship to another place where the same
thing happens (see next mail) clearer.

 src/implicit.c | 18 ++++++------------
 1 file changed, 6 insertions(+), 12 deletions(-)

diff --git a/src/implicit.c b/src/implicit.c
index 707eff5..7bdc8ba 100644
--- a/src/implicit.c
+++ b/src/implicit.c
@@ -443,7 +443,6 @@ pattern_search (struct file *file, int archive,
           unsigned int deps_found = 0;
           /* NPTR points to the part of the prereq we haven't processed.  */
           const char *nptr = 0;
-          const char *dir = NULL;
           int order_only = 0;
           unsigned int matches;
 
@@ -478,7 +477,6 @@ pattern_search (struct file *file, int archive,
                   memcpy (pathdir, filename, pathlen);
                   pathdir[pathlen] = '\0';
                 }
-              dir = pathdir;
             }
 
           if (stemlen > GET_PATH_MAX)
@@ -646,7 +644,7 @@ pattern_search (struct file *file, int archive,
                       /* Parse the expanded string. */
                       struct dep *dp = PARSE_FILE_SEQ (&p, struct dep,
                                                        order_only ? MAP_NUL : 
MAP_PIPE,
-                                                       add_dir ? dir : NULL, 
PARSEFS_NONE);
+                                                       add_dir ? pathdir : 
NULL, PARSEFS_NONE);
                       *dptr = dp;
 
                       for (d = dp; d != NULL; d = d->next)
@@ -931,17 +929,13 @@ pattern_search (struct file *file, int archive,
     }
   else
     {
-      size_t dirlen = (lastslash + 1) - filename;
-      char *sp;
-
       /* We want to prepend the directory from
          the original FILENAME onto the stem.  */
-      fullstemlen = dirlen + stemlen;
-      sp = alloca (fullstemlen + 1);
-      memcpy (sp, filename, dirlen);
-      memcpy (sp + dirlen, stem, stemlen);
-      sp[fullstemlen] = '\0';
-      file->stem = strcache_add (sp);
+      fullstemlen = pathlen + stemlen;
+      memcpy (stem_str, filename, pathlen);
+      memcpy (stem_str + pathlen, stem, stemlen);
+      stem_str[fullstemlen] = '\0';
+      file->stem = strcache_add (stem_str);
     }
 
   file->cmds = rule->cmds;
-- 
2.23.0