add an errno utility, LP: #612267

add optimizations from Scott Moser

debian/changelog

@@ -2,7 +2,7 @@ ubuntu-dev-tools (0.102) UNRELEASED; urgency=low
 
   [ Dustin Kirkland ]
   * errno, doc/errno.1, debian/control, debian/copyright, setup.py:
-    - add an errno utility, LP: #61226
+    - add an errno utility, LP: #612267
 
  -- Dustin Kirkland <kirkland@ubuntu.com>  Tue, 10 Aug 2010 11:41:10 -0400
 

errno

@@ -2,8 +2,14 @@
 #
 #    errno - search POSIX error codes by error number, error name,
 #            or error description
+#
 #    Copyright (C) 2010 Dustin Kirkland <kirkland@ubuntu.com>
 #
+#    Authors:
+#        Dustin Kirkland <kirkland@ubuntu.com>
+#        Kees Cook <kees@ubuntu.com>
+#        Scott Moser <smoser@ubuntu.com>
+#
 #    This program is free software: you can redistribute it and/or modify
 #    it under the terms of the GNU General Public License as published by
 #    the Free Software Foundation, either version 3 of the License.
@@ -16,7 +22,7 @@
 #    You should have received a copy of the GNU General Public License
 #    along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-if $(which gcc >/dev/null); then
+if which gcc >/dev/null; then
 	# Header finding trick from Kees Cook <kees@ubuntu.com>
 	headers=$(echo "#include <asm/errno.h>" | gcc -E - | grep "\.h" | awk -F\" '{print $2}' | sort -u)
 else
@@ -25,10 +31,12 @@ fi
 
 code="$1"
 
-if echo "$code" | egrep -qs "^[0-9]+$"; then
-	# Input is a number, search for a particular matching code
-	egrep -h "^#define\s.*\s+$code\s+/" $headers | sed 's/^#define\s*//'
-else
-	# Input is not a number, search for any matching strings
-	grep -hi "$code" $headers | sed 's/^#define\s*//'
-fi
+for code in "${@}"; do
+	if [ "$code" -le 0 -o "$code" -ge 0 ] 2>/dev/null; then
+		# Input is a number, search for a particular matching code
+		sed -n "s,^#define\s\+\([^[:space:]]\+\s\+${code}\s.*\),\1,p" ${headers}
+	else
+		# Input is not a number, search for any matching strings
+		sed -n "s,^#define\s\+\(.*${code}.*\),\1,Ip" ${headers}
+	fi
+done