bus: use gperf to map error string to errno

5 files changed, 69 insertions, 75 deletions

diff --git a/Makefile.am b/Makefile.am
index 3f47bc8e5d..6c30a05a39 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -2024,6 +2024,9 @@ libsystemd_bus_la_SOURCES = \
 	src/libsystemd-bus/event-util.h \
 	src/libsystemd-bus/bus-protocol.h
 
+nodist_libsystemd_bus_la_SOURCES = \
+	src/libsystemd-bus/bus-error-mapping.c
+
 libsystemd_bus_la_LIBADD = \
 	libsystemd-id128-internal.la \
 	libsystemd-daemon-internal.la \
@@ -2042,6 +2045,7 @@ pkgconfiglib_DATA += \
 	src/libsystemd-bus/libsystemd-bus.pc
 
 EXTRA_DIST += \
+	src/libsystemd-bus/bus-error-mapping.gperf \
 	src/libsystemd-bus/libsystemd-bus.pc.in \
 	src/libsystemd-bus/DIFFERENCES \
 	src/libsystemd-bus/GVARIANT-SERIALIZATION
@@ -2052,6 +2056,9 @@ lib_LTLIBRARIES += \
 libsystemd_bus_internal_la_SOURCES = \
 	$(libsystemd_bus_la_SOURCES)
 
+nodist_libsystemd_bus_internal_la_SOURCES = \
+	$(nodist_libsystemd_bus_la_SOURCES)
+
 libsystemd_bus_internal_la_CFLAGS = \
 	$(libsystemd_bus_la_CFLAGS)
 
diff --git a/src/libsystemd-bus/.gitignore b/src/libsystemd-bus/.gitignore
index 5f797a28d5..fcfd804516 100644
--- a/src/libsystemd-bus/.gitignore
+++ b/src/libsystemd-bus/.gitignore
@@ -1 +1,2 @@
 /libsystemd-bus.pc
+/bus-error-mapping.c
diff --git a/src/libsystemd-bus/bus-error-mapping.gperf b/src/libsystemd-bus/bus-error-mapping.gperf
new file mode 100644
index 0000000000..df2c4d407d
--- /dev/null
+++ b/src/libsystemd-bus/bus-error-mapping.gperf
@@ -0,0 +1,49 @@
+%{
+#include <errno.h>
+#include "bus-error.h"
+%}
+name_error_mapping;
+%null_strings
+%language=ANSI-C
+%define slot-name name
+%define hash-function-name bus_error_mapping_hash
+%define lookup-function-name bus_error_mapping_lookup
+%readonly-tables
+%omit-struct-type
+%struct-type
+%includes
+%%
+org.freedesktop.DBus.Error.Failed,                        EACCES
+org.freedesktop.DBus.Error.NoMemory,                      ENOMEM
+org.freedesktop.DBus.Error.ServiceUnknown,                EHOSTUNREACH
+org.freedesktop.DBus.Error.NameHasNoOwner,                ENXIO
+org.freedesktop.DBus.Error.NoReply,                       ETIMEDOUT
+org.freedesktop.DBus.Error.IOError,                       EIO
+org.freedesktop.DBus.Error.BadAddress,                    EADDRNOTAVAIL
+org.freedesktop.DBus.Error.NotSupported,                  ENOTSUP
+org.freedesktop.DBus.Error.LimitsExceeded,                ENOBUFS
+org.freedesktop.DBus.Error.AccessDenied,                  EACCES
+org.freedesktop.DBus.Error.AuthFailed,                    EACCES
+org.freedesktop.DBus.Error.NoServer,                      EHOSTDOWN
+org.freedesktop.DBus.Error.Timeout,                       ETIMEDOUT
+org.freedesktop.DBus.Error.NoNetwork,                     ENONET
+org.freedesktop.DBus.Error.AddressInUse,                  EADDRINUSE
+org.freedesktop.DBus.Error.Disconnected,                  ECONNRESET
+org.freedesktop.DBus.Error.InvalidArgs,                   EINVAL
+org.freedesktop.DBus.Error.FileNotFound,                  ENOENT
+org.freedesktop.DBus.Error.FileExists,                    EEXIST
+org.freedesktop.DBus.Error.UnknownMethod,                 EBADR
+org.freedesktop.DBus.Error.UnknownObject,                 EBADR
+org.freedesktop.DBus.Error.UnknownInterface,              EBADR
+org.freedesktop.DBus.Error.UnknownProperty,               EBADR
+org.freedesktop.DBus.Error.PropertyReadOnly,              EROFS
+org.freedesktop.DBus.Error.UnixProcessIdUnknown,          ESRCH
+org.freedesktop.DBus.Error.InvalidSignature,              EINVAL
+org.freedesktop.DBus.Error.InconsistentMessage,           EBADMSG
+#
+org.freedesktop.DBus.Error.TimedOut,                      ETIMEDOUT
+org.freedesktop.DBus.Error.MatchRuleInvalid,              EINVAL
+org.freedesktop.DBus.Error.InvalidFileContent,            EINVAL
+org.freedesktop.DBus.Error.MatchRuleNotFound,             ENOENT
+org.freedesktop.DBus.Error.SELinuxSecurityContextUnknown, ESRCH
+org.freedesktop.DBus.Error.ObjectPathInUse,               EBUSY
diff --git a/src/libsystemd-bus/bus-error.c b/src/libsystemd-bus/bus-error.c
index 25eaf0eee4..35bd4f0daf 100644
--- a/src/libsystemd-bus/bus-error.c
+++ b/src/libsystemd-bus/bus-error.c
@@ -38,6 +38,7 @@
 static int bus_error_name_to_errno(const char *name) {
         const char *p;
         int r;
+        const name_error_mapping *m;
 
         if (!name)
                 return EINVAL;
@@ -51,81 +52,9 @@ static int bus_error_name_to_errno(const char *name) {
                 return r;
         }
 
-        /* Better replace this with a gperf table */
-
-        if (streq(name, SD_BUS_ERROR_NO_MEMORY))
-                return ENOMEM;
-
-        if (streq(name, SD_BUS_ERROR_SERVICE_UNKNOWN))
-                return EHOSTUNREACH;
-
-        if (streq(name, SD_BUS_ERROR_NAME_HAS_NO_OWNER))
-                return ENXIO;
-
-        if (streq(name, SD_BUS_ERROR_NO_REPLY) ||
-            streq(name, SD_BUS_ERROR_TIMEOUT) ||
-            streq(name, "org.freedesktop.DBus.Error.TimedOut"))
-                return ETIMEDOUT;
-
-        if (streq(name, SD_BUS_ERROR_IO_ERROR))
-                return EIO;
-
-        if (streq(name, SD_BUS_ERROR_BAD_ADDRESS))
-                return EADDRNOTAVAIL;
-
-        if (streq(name, SD_BUS_ERROR_NOT_SUPPORTED))
-                return ENOTSUP;
-
-        if (streq(name, SD_BUS_ERROR_LIMITS_EXCEEDED))
-                return ENOBUFS;
-
-        if (streq(name, SD_BUS_ERROR_ACCESS_DENIED) ||
-            streq(name, SD_BUS_ERROR_AUTH_FAILED))
-                return EACCES;
-
-        if (streq(name, SD_BUS_ERROR_NO_SERVER))
-                return EHOSTDOWN;
-
-        if (streq(name, SD_BUS_ERROR_NO_NETWORK))
-                return ENONET;
-
-        if (streq(name, SD_BUS_ERROR_ADDRESS_IN_USE))
-                return EADDRINUSE;
-
-        if (streq(name, SD_BUS_ERROR_DISCONNECTED))
-                return ECONNRESET;
-
-        if (streq(name, SD_BUS_ERROR_INVALID_ARGS) ||
-            streq(name, SD_BUS_ERROR_INVALID_SIGNATURE) ||
-            streq(name, "org.freedesktop.DBus.Error.MatchRuleInvalid") ||
-            streq(name, "org.freedesktop.DBus.Error.InvalidFileContent"))
-                return EINVAL;
-
-        if (streq(name, SD_BUS_ERROR_FILE_NOT_FOUND) ||
-            streq(name, "org.freedesktop.DBus.Error.MatchRuleNotFound"))
-                return ENOENT;
-
-        if (streq(name, SD_BUS_ERROR_FILE_EXISTS))
-                return EEXIST;
-
-        if (streq(name, SD_BUS_ERROR_UNKNOWN_METHOD) ||
-            streq(name, SD_BUS_ERROR_UNKNOWN_OBJECT) ||
-            streq(name, SD_BUS_ERROR_UNKNOWN_INTERFACE) ||
-            streq(name, SD_BUS_ERROR_UNKNOWN_PROPERTY))
-                return EBADR;
-
-        if (streq(name, SD_BUS_ERROR_PROPERTY_READ_ONLY))
-                return EROFS;
-
-        if (streq(name, SD_BUS_ERROR_UNIX_PROCESS_ID_UNKNOWN) ||
-            streq(name, "org.freedesktop.DBus.Error.SELinuxSecurityContextUnknown"))
-                return ESRCH;
-
-        if (streq(name, SD_BUS_ERROR_INCONSISTENT_MESSAGE))
-                return EBADMSG;
-
-        if (streq(name, "org.freedesktop.DBus.Error.ObjectPathInUse"))
-                return EBUSY;
+        m = bus_error_mapping_lookup(name, strlen(name));
+        if (m)
+                return m->code;
 
         return EIO;
 }
diff --git a/src/libsystemd-bus/bus-error.h b/src/libsystemd-bus/bus-error.h
index f6b9824c95..cf0ad9d545 100644
--- a/src/libsystemd-bus/bus-error.h
+++ b/src/libsystemd-bus/bus-error.h
@@ -26,6 +26,14 @@
 #include "sd-bus.h"
 #include "macro.h"
 
+struct name_error_mapping {
+        const char* name;
+        int code;
+};
+typedef struct name_error_mapping name_error_mapping;
+
+const name_error_mapping* bus_error_mapping_lookup(const char *str, unsigned int len);
+
 bool bus_error_is_dirty(sd_bus_error *e);
 
 const char *bus_error_message(const sd_bus_error *e, int error);