grep: make "-f -" work (+ testsuite)

diff: small code shrink

function                                             old     new   delta
grep_main                                            722     714      -8
diffreg                                             1825    1793     -32
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/2 up/down: 0/-40)             Total: -40 bytes

1 files changed, 6 insertions, 6 deletions

diff --git a/findutils/grep.c b/findutils/grep.c
index 6af1b46e1..fc7893860 100644
--- a/findutils/grep.c
+++ b/findutils/grep.c
@@ -126,7 +126,7 @@ struct globals {
 typedef struct grep_list_data_t {
         char *pattern;
         regex_t preg;
-#define PATTERN_MEM_A 1
+#define ALLOCATED 1
 #define COMPILED 2
         int flg_mem_alocated_compiled;
 } grep_list_data_t;
@@ -363,10 +363,10 @@ static void load_regexes_from_file(llist_t *fopt)
 
                 fopt = cur->link;
                 free(cur);
-                f = xfopen(ffile, "r");
+                f = xfopen_stdin(ffile);
                 while ((line = xmalloc_fgetline(f)) != NULL) {
                         llist_add_to(&pattern_head,
-                                new_grep_list_data(line, PATTERN_MEM_A));
+                                new_grep_list_data(line, ALLOCATED));
                 }
         }
 }
@@ -486,7 +486,7 @@ int grep_main(int argc, char **argv)
                 argc--;
         }
 
-        /* argv[(optind)..(argc-1)] should be names of file to grep through. If
+        /* argv[0..(argc-1)] should be names of file to grep through. If
          * there is more than one file to grep, we will print the filenames. */
         if (argc > 1)
                 print_filename = 1;
@@ -535,9 +535,9 @@ int grep_main(int argc, char **argv)
                         grep_list_data_t *gl = (grep_list_data_t *)pattern_head_ptr->data;
 
                         pattern_head = pattern_head->link;
-                        if ((gl->flg_mem_alocated_compiled & PATTERN_MEM_A))
+                        if (gl->flg_mem_alocated_compiled & ALLOCATED)
                                 free(gl->pattern);
-                        if ((gl->flg_mem_alocated_compiled & COMPILED))
+                        if (gl->flg_mem_alocated_compiled & COMPILED)
                                 regfree(&(gl->preg));
                         free(gl);
                         free(pattern_head_ptr);