Expand each `&' character in the gecos field.

(count_ampersands): New function.
(create_fullname): New function.
(print_entry): Use create_fullname here.
(print_long_entry): Use it here, too.
From Kaveh Ghazi.

src/pinky.c

@@ -81,6 +81,56 @@ static struct option const longopts[] =
   {NULL, 0, NULL, 0}
 };
 
+/* Count and return the number of ampersands in STR.  */
+
+static int
+count_ampersands (const char *str)
+{
+  int count = 0;
+  do
+    {
+      if (*str == '&')
+	count++;
+    } while (*str++);
+  return count;
+}
+
+/* Create a string (via xmalloc) which contains a full name by substituting
+   for each ampersand in GECOS_NAME the USER_NAME string with its first
+   character capitalized.  The caller must ensure that GECOS_NAME contains
+   no `,'s.  The caller also is responsible for free'ing the return value of
+   this function.  */
+
+static char *
+create_fullname (const char *gecos_name, const char *user_name)
+{
+  const int result_len = strlen (gecos_name)
+    + count_ampersands (gecos_name) * (strlen (user_name) - 1) + 1;
+  char *const result = xmalloc (result_len);
+  char *r = result;
+
+  while (*gecos_name)
+    {
+      if (*gecos_name == '&')
+	{
+	  const char *uname = user_name;
+	  if (ISLOWER (*uname))
+	    *r++ = TOUPPER (*uname++);
+	  while (*uname)
+	    *r++ = *uname++;
+	}
+      else
+	{
+	  *r++ = *gecos_name;
+	}
+
+      gecos_name++;
+    }
+  *r = 0;
+
+  return result;
+}
+
 /* Return a string representing the time between WHEN and the time
    that this function is first run. */
 
@@ -164,11 +214,14 @@ print_entry (const STRUCT_UTMP *utmp_ent)
       else
 	{
 	  char *const comma = strchr (pw->pw_gecos, ',');
+	  char *result;
+
 	  if (comma)
 	    *comma = '\0';
 
-	  /* FIXME: we don't yet convert '&' to username capitalized. */
-	  printf (" %-19.19s", pw->pw_gecos);
+	  result = create_fullname (pw->pw_gecos, pw->pw_name);
+	  printf (" %-19.19s", result);
+	  free (result);
 	}
     }
 
@@ -245,11 +298,14 @@ print_long_entry (const char name[])
   else
     {
       char *const comma = strchr (pw->pw_gecos, ',');
+      char *result;
+
       if (comma)
 	*comma = '\0';
 
-      /* FIXME: we don't yet convert '&' to username capitalized. */
-      printf (" %s", pw->pw_gecos);
+      result = create_fullname (pw->pw_gecos, pw->pw_name);
+      printf (" %s", result);
+      free (result);
     }
 
   putchar ('\n');