From b876a119c477530b556e491c1a923212c3b0a67c Mon Sep 17 00:00:00 2001
From: Lars Wirzenius <liw@liw.fi>
Date: Tue, 5 Jun 2012 15:11:37 +0100
Subject: Add --search option to errno

---
 errno.c       | 44 ++++++++++++++++++++++++++++++++++++++++----
 errno.docbook |  9 +++++++++
 2 files changed, 49 insertions(+), 4 deletions(-)

diff --git a/errno.c b/errno.c
index 3b981ce..64a4770 100644
--- a/errno.c
+++ b/errno.c
@@ -17,6 +17,7 @@
  * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  */
 
+#define _GNU_SOURCE
 
 #include <ctype.h>
 #include <errno.h>
@@ -72,17 +73,44 @@ report_from_code(int code)
 }
 
 
+static bool
+matches(int code, int num_words, char **words)
+{
+    const char *text = strerror(code);
+    int i;
+    
+    for (i = 0; i < num_words; ++i) {
+        if (strcasestr(text, words[i]) == NULL)
+            return false;
+    }
+    return true;
+}
+
+
+static void
+search(int num_words, char **words)
+{
+    int i;
+    
+    for (i = 0; i < num_errnos; ++i) {
+        if (matches(errnos[i].code, num_words, words))
+            report(errnos[i].name, errnos[i].code);
+    }
+}
+
+
 static struct option
 options[] = {
     { "help", 0, NULL, 'h' },
     { "list", 0, NULL, 'l' },
+    { "search", 0, NULL, 's' },
 };
 
 
 static void
 usage(void)
 {
-    printf("Usage: errno [-l] [--list] [keyword]\n");
+    printf("Usage: errno [-ls] [--list] [--search] [keyword]\n");
 }
 
 
@@ -92,10 +120,10 @@ main(int argc, char **argv)
     int i;
     int exit_code;
     int index = 0;
-    enum { lookup_mode, list_mode } mode = lookup_mode;
+    enum { lookup_mode, list_mode, search_mode } mode = lookup_mode;
     
     for (;;) {
-        int c = getopt_long(argc, argv, "l", options, &index);
+        int c = getopt_long(argc, argv, "hls", options, &index);
         if (c == -1)
             break;
             
@@ -107,6 +135,10 @@ main(int argc, char **argv)
         case 'l':
             mode = list_mode;
             break;
+            
+        case 's':
+            mode = search_mode;
+            break;
 
         case '?':
             break;
@@ -121,7 +153,7 @@ main(int argc, char **argv)
 
     switch (mode) {
     case lookup_mode:
-        for (i = 1; i < argc; ++i) {
+        for (i = optind; i < argc; ++i) {
             const char *arg = argv[i];
             if (toupper(arg[0]) == 'E') {
                 if (!report_from_name(arg))
@@ -140,6 +172,10 @@ main(int argc, char **argv)
         for (i = 0; i < num_errnos; ++i)
             report(errnos[i].name, errnos[i].code);
         break;
+        
+    case search_mode:
+        search(argc - optind, argv + optind);
+        break;
     }
 
     return exit_code;
diff --git a/errno.docbook b/errno.docbook
index 64fd488..01a56bf 100644
--- a/errno.docbook
+++ b/errno.docbook
@@ -81,6 +81,15 @@ with this program; if not, write to the Free Software Foundation, Inc.,
                     <para>List all errno values.</para>
                 </listitem>
             </varlistentry>
+
+            <varlistentry>
+                <term><option>-s</option></term>
+                <term><option>--search</option></term>
+                <listitem>
+                    <para>Search for errors whose description contains
+                    all the given words (case-insensitive).</para>
+                </listitem>
+            </varlistentry>
         </variablelist>
 
 	</refsect1>
-- 
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