find: add optional support for -links. +100 bytes

Signed-off-by: Matheus Izvekov <mizvekov@gmail.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

3 files changed, 36 insertions, 6 deletions

diff --git a/findutils/Config.in b/findutils/Config.in
index f274ad1c6..8582d6446 100644
--- a/findutils/Config.in
+++ b/findutils/Config.in
@@ -171,6 +171,13 @@ config FEATURE_FIND_CONTEXT
         help
           Support the 'find -context' option for matching security context.
 
+config FEATURE_FIND_LINKS
+        bool "Enable -links: link count matching"
+        default n
+        depends on FIND
+        help
+          Support the 'find -links' option for matching number of links.
+
 config GREP
         bool "grep"
         default n
diff --git a/findutils/find.c b/findutils/find.c
index 1b2466816..f0c259833 100644
--- a/findutils/find.c
+++ b/findutils/find.c
@@ -96,6 +96,7 @@ IF_FEATURE_FIND_PRUNE(  ACTS(prune))
 IF_FEATURE_FIND_DELETE( ACTS(delete))
 IF_FEATURE_FIND_EXEC(   ACTS(exec,  char **exec_argv; unsigned *subst_count; int exec_argc;))
 IF_FEATURE_FIND_GROUP(  ACTS(group, gid_t gid;))
+IF_FEATURE_FIND_LINKS(  ACTS(links, char links_char; int links_count;))
 
 struct globals {
         IF_FEATURE_FIND_XDEV(dev_t *xdev_dev;)
@@ -175,7 +176,7 @@ static int exec_actions(action ***appp, const char *fileName, const struct stat
          * On return, bit is restored.  */
 
         cur_group = -1;
-        while ((app = appp[++cur_group])) {
+        while ((app = appp[++cur_group]) != NULL) {
                 rc &= ~TRUE; /* 'success' so far, clear TRUE bit */
                 cur_action = -1;
                 while (1) {
@@ -390,7 +391,16 @@ ACTF(context)
         return rc == 0;
 }
 #endif
-
+#if ENABLE_FEATURE_FIND_LINKS
+ACTF(links)
+{
+        switch(ap->links_char) {
+        case '-' : return (statbuf->st_nlink <  ap->links_count);
+        case '+' : return (statbuf->st_nlink >  ap->links_count);
+        default:   return (statbuf->st_nlink == ap->links_count);
+        }
+}
+#endif
 
 static int FAST_FUNC fileAction(const char *fileName,
                 struct stat *statbuf,
@@ -463,7 +473,7 @@ static int find_type(const char *type)
 
 #if ENABLE_FEATURE_FIND_PERM \
  || ENABLE_FEATURE_FIND_MTIME || ENABLE_FEATURE_FIND_MMIN \
- || ENABLE_FEATURE_FIND_SIZE
+ || ENABLE_FEATURE_FIND_SIZE  || ENABLE_FEATURE_FIND_LINKS
 static const char* plus_minus_num(const char* str)
 {
         if (*str == '-' || *str == '+')
@@ -505,6 +515,7 @@ static action*** parse_params(char **argv)
         IF_FEATURE_FIND_GROUP(  PARM_group     ,)
         IF_FEATURE_FIND_SIZE(   PARM_size      ,)
         IF_FEATURE_FIND_CONTEXT(PARM_context   ,)
+        IF_FEATURE_FIND_LINKS(  PARM_links     ,)
         };
 
         static const char params[] ALIGN1 =
@@ -538,6 +549,7 @@ static action*** parse_params(char **argv)
         IF_FEATURE_FIND_GROUP(  "-group\0"  )
         IF_FEATURE_FIND_SIZE(   "-size\0"   )
         IF_FEATURE_FIND_CONTEXT("-context\0")
+        IF_FEATURE_FIND_LINKS(  "-links\0"  )
                                  ;
 
         action*** appp;
@@ -823,6 +835,14 @@ static action*** parse_params(char **argv)
                                 bb_simple_perror_msg(arg1);
                 }
 #endif
+#if ENABLE_FEATURE_FIND_LINKS
+                else if (parm == PARM_links) {
+                        action_links *ap;
+                        ap = ALLOC_ACTION(links);
+                        ap->links_char = arg1[0];
+                        ap->links_count = xatoul(plus_minus_num(arg1));
+                }
+#endif
                 else {
                         bb_error_msg("unrecognized: %s", arg);
                         bb_show_usage();
diff --git a/include/usage.h b/include/usage.h
index eab57d8ae..4254e153c 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -1232,13 +1232,13 @@
      "\n        -type X         File type is X (X is one of: f,d,l,b,c,...)") \
         IF_FEATURE_FIND_PERM( \
      "\n        -perm NNN       Permissions match any of (+NNN), all of (-NNN)," \
-     "\n                        or exactly (NNN)") \
+     "\n                        or exactly NNN") \
         IF_FEATURE_FIND_MTIME( \
      "\n        -mtime DAYS     Modified time is greater than (+N), less than (-N)," \
-     "\n                        or exactly (N) days") \
+     "\n                        or exactly N days") \
         IF_FEATURE_FIND_MMIN( \
      "\n        -mmin MINS      Modified time is greater than (+N), less than (-N)," \
-     "\n                        or exactly (N) minutes") \
+     "\n                        or exactly N minutes") \
         IF_FEATURE_FIND_NEWER( \
      "\n        -newer FILE     Modified time is more recent than FILE's") \
         IF_FEATURE_FIND_INUM( \
@@ -1252,6 +1252,9 @@
         IF_FEATURE_FIND_SIZE( \
      "\n        -size N[bck]    File size is N (c:bytes,k:kbytes,b:512 bytes(def.))." \
      "\n                        +/-N: file size is bigger/smaller than N") \
+        IF_FEATURE_FIND_LINKS( \
+     "\n        -links N        Number of links is greater than (+N), less than (-N)," \
+     "\n                        or exactly N") \
      "\n        -print          Print (default and assumed)" \
         IF_FEATURE_FIND_PRINT0( \
      "\n        -print0         Delimit output with null characters rather than" \