Move getusername/getgroupname to lib. (Return name or string representation

of number, but never NULL. Both returned in static buffer good through
next call.)

2 files changed, 25 insertions, 0 deletions

diff --git a/lib/lib.c b/lib/lib.c
index 718ea3ac..8f8b4a3b 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -1184,3 +1184,26 @@ int regexec0(regex_t *preg, char *string, long len, int nmatch,
     len -= ll;
   }
 }
+
+// Return user name or string representation of number, returned buffer
+// lasts until next call.
+char *getusername(uid_t uid)
+{
+  struct passwd *pw = bufgetpwuid(uid);
+  static char unum[12];
+
+  sprintf(unum, "%u", (unsigned)uid);
+  return pw ? pw->pw_name : unum;
+}
+
+// Return group name or string representation of number, returned buffer
+// lasts until next call.
+char *getgroupname(gid_t gid)
+{
+  struct group *gr = bufgetgrgid(gid);
+  static char gnum[12];
+
+  sprintf(gnum, "%u", (unsigned)gid);
+  return gr ? gr->gr_name : gnum;
+}
+
diff --git a/lib/lib.h b/lib/lib.h
index 520a5ed6..67d53035 100644
--- a/lib/lib.h
+++ b/lib/lib.h
@@ -223,6 +223,8 @@ int readlinkat0(int dirfd, char *path, char *buf, int len);
 int readlink0(char *path, char *buf, int len);
 int regexec0(regex_t *preg, char *string, long len, int nmatch,
   regmatch_t pmatch[], int eflags);
+char *getusername(uid_t uid);
+char *getgroupname(gid_t gid);
 
 #define HR_SPACE 1 // Space between number and units
 #define HR_B     2 // Use "B" for single byte units