From ff1dad7ec8717a3cf4a798daff9f025964c660f5 Mon Sep 17 00:00:00 2001
From: defanor <defanor@uberspace.net>
Date: Thu, 26 Nov 2020 15:09:42 +0300
Subject: Introduce rexmpp_strerror

---
 examples/basic.c   |  2 +-
 examples/weechat.c |  2 +-
 src/rexmpp.c       | 31 +++++++++++++++++++++++++++++++
 src/rexmpp.h       |  9 ++++++++-
 4 files changed, 41 insertions(+), 3 deletions(-)

diff --git a/examples/basic.c b/examples/basic.c
index 1d19c90..cd3d6e3 100644
--- a/examples/basic.c
+++ b/examples/basic.c
@@ -160,7 +160,7 @@ main (int argc, char **argv) {
       break;
     }
     if (err != REXMPP_E_AGAIN) {
-      puts("error");
+      printf("error: %s\n", rexmpp_strerror(err));
       break;
     }
     /* Could inspect the state here. */
diff --git a/examples/weechat.c b/examples/weechat.c
index 29a592a..1fa4e57 100644
--- a/examples/weechat.c
+++ b/examples/weechat.c
@@ -432,7 +432,7 @@ void iter (struct weechat_rexmpp *wr, fd_set *rfds, fd_set *wfds) {
     return;
   }
   if (err != REXMPP_E_AGAIN) {
-    weechat_printf(wr->server_buffer, "rexmpp error");
+    weechat_printf(wr->server_buffer, "rexmpp error: %s", rexmpp_strerror(err));
     return;
   }
   fd_set read_fds, write_fds;
diff --git a/src/rexmpp.c b/src/rexmpp.c
index a004fbe..13b8c00 100644
--- a/src/rexmpp.c
+++ b/src/rexmpp.c
@@ -34,6 +34,37 @@
 #include "rexmpp_openpgp.h"
 #include "rexmpp_console.h"
 
+const char *rexmpp_strerror (rexmpp_err_t error) {
+  switch (error) {
+  case REXMPP_SUCCESS: return "No error";
+  case REXMPP_E_AGAIN: return "An operation is in progress";
+  case REXMPP_E_SEND_QUEUE_FULL: return
+      "A message can't be queued for sending, because the queue is full";
+  case REXMPP_E_STANZA_QUEUE_FULL: return
+      "The library can't take responsibility for message delivery because "
+      "XEP-0198 stanza queue is full";
+  case REXMPP_E_CANCELLED: return "Cancelled by a user";
+  case REXMPP_E_SEND_BUFFER_EMPTY: return
+      "Attempted to send while send buffer is empty";
+  case REXMPP_E_SEND_BUFFER_NOT_EMPTY: return
+      "Attempted to start sending while send buffer is not empty";
+  case REXMPP_E_SASL: return "SASL-related error";
+  case REXMPP_E_PGP: return "OpenPGP-related error";
+  case REXMPP_E_TLS: return "TLS-related error";
+  case REXMPP_E_TCP: return "TCP-related error";
+  case REXMPP_E_DNS: return "DNS-related error";
+  case REXMPP_E_XML: return "XML-related error";
+  case REXMPP_E_JID: return "JID-related error";
+  case REXMPP_E_MALLOC: return "Memory allocation failure";
+  case REXMPP_E_ROSTER: return "Roster-related error";
+  case REXMPP_E_ROSTER_ITEM_NOT_FOUND: return "Roster item is not found";
+  case REXMPP_E_PARAM: return "An erroneous parameter is supplied";
+  case REXMPP_E_STREAM: return "A stream error";
+  case REXMPP_E_OTHER: return "An unspecified error";
+  default: return "Unknown error";
+  }
+}
+
 void rexmpp_sax_start_elem_ns (rexmpp_t *s,
                                const char *localname,
                                const char *prefix,
diff --git a/src/rexmpp.h b/src/rexmpp.h
index 781a1df..570cab1 100644
--- a/src/rexmpp.h
+++ b/src/rexmpp.h
@@ -178,7 +178,7 @@ enum rexmpp_err {
   REXMPP_E_SEND_BUFFER_NOT_EMPTY,
   /** SASL-related error. */
   REXMPP_E_SASL,
-  /** OpenGPG-related error. */
+  /** OpenPGP-related error. */
   REXMPP_E_PGP,
   /** TLS-related error. */
   REXMPP_E_TLS,
@@ -519,4 +519,11 @@ xmlNodePtr rexmpp_find_event (rexmpp_t *s,
 
 void rexmpp_console_feed (rexmpp_t *s, char *str, ssize_t str_len);
 
+/**
+   @brief A strerror function for ::rexmpp_err
+   @param[in] error Error code, as returned by rexmpp functions.
+   @returns A string explaining the error.
+*/
+const char *rexmpp_strerror (rexmpp_err_t error);
+
 #endif
-- 
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