X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;ds=inline;f=ovsdb%2Fovsdb-idlc.in;h=24387b876f50d52e5576bd56a12677733b673a8c;hb=a4af00400a835eb87569ba40e21874c05e872c0f;hp=2cde35e3a220512cb8fe4a4dab347b7f8d8dd90f;hpb=d879a707a38eff0335e1b5c12ae4c61f4aa0296b;p=sliver-openvswitch.git diff --git a/ovsdb/ovsdb-idlc.in b/ovsdb/ovsdb-idlc.in index 2cde35e3a..24387b876 100755 --- a/ovsdb/ovsdb-idlc.in +++ b/ovsdb/ovsdb-idlc.in @@ -1,8 +1,8 @@ #! @PYTHON@ import getopt +import os import re -import sha import sys sys.path.insert(0, "@abs_top_srcdir@/ovsdb") @@ -31,10 +31,12 @@ def mustGetMember(json, name, expectedType, description): return member class DbSchema: - def __init__(self, name, comment, tables): + def __init__(self, name, comment, tables, idlPrefix, idlHeader): self.name = name self.comment = comment self.tables = tables + self.idlPrefix = idlPrefix + self.idlHeader = idlHeader @staticmethod def fromJson(json): @@ -42,9 +44,12 @@ class DbSchema: comment = getMember(json, 'comment', [unicode], 'database') tablesJson = mustGetMember(json, 'tables', [dict], 'database') tables = {} - for name, json in tablesJson.iteritems(): - tables[name] = TableSchema.fromJson(json, "%s table" % name) - return DbSchema(name, comment, tables) + for tableName, tableJson in tablesJson.iteritems(): + tables[tableName] = TableSchema.fromJson(tableJson, + "%s table" % tableName) + idlPrefix = mustGetMember(json, 'idlPrefix', [unicode], 'database') + idlHeader = mustGetMember(json, 'idlHeader', [unicode], 'database') + return DbSchema(name, comment, tables, idlPrefix, idlHeader) def toJson(self): d = {"name": self.name, @@ -90,7 +95,7 @@ class ColumnSchema: type = Type.fromJson(mustGetMember(json, 'type', [dict, unicode], description), 'type of %s' % description) - ephemeral = getMember(json, 'ephemeral', [True,False], description) + ephemeral = getMember(json, 'ephemeral', [bool], description) persistent = ephemeral != True return ColumnSchema(comment, type, persistent) @@ -138,13 +143,54 @@ class Type: d["max"] = self.max return d + def isScalar(self): + return self.min == 1 and self.max == 1 and not self.value + + def isOptional(self): + return self.min == 0 and self.max == 1 + + def toEnglish(self): + keyName = atomicTypeToEnglish(self.key, self.keyRefTable) + if self.value: + valueName = atomicTypeToEnglish(self.value, self.valueRefTable) + + if self.isScalar(): + return atomicTypeToEnglish(self.key, self.keyRefTable) + elif self.isOptional(): + if self.value: + return "optional %s-%s pair" % (keyName, valueName) + else: + return "optional %s" % keyName + else: + if self.max == "unlimited": + if self.min: + quantity = "%d or more " % self.min + else: + quantity = "" + elif self.min: + quantity = "%d to %d " % (self.min, self.max) + else: + quantity = "up to %d " % self.max + + if self.value: + return "map of %s%s-%s pairs" % (quantity, keyName, valueName) + else: + return "set of %s%s" % (quantity, keyName) + + +def atomicTypeToEnglish(base, refTable): + if base == 'uuid' and refTable: + return refTable + else: + return base + def parseSchema(filename): - file = open(filename, "r") - s = "" - for line in file: - if not line.startswith('//'): - s += line - return DbSchema.fromJson(json.loads(s)) + return DbSchema.fromJson(json.load(open(filename, "r"))) + +def annotateSchema(schemaFile, annotationFile): + schemaJson = json.load(open(schemaFile, "r")) + execfile(annotationFile, globals(), {"s": schemaJson}) + json.dump(schemaJson, sys.stdout) def cBaseType(prefix, type, refTable=None): if type == 'uuid' and refTable: @@ -156,8 +202,83 @@ def cBaseType(prefix, type, refTable=None): 'boolean': 'bool ', 'string': 'char *'}[type] -def printCIDLHeader(schema): - prefix = 'ovsrec_' +def cCopyType(indent, dst, src, type, refTable=None): + args = {'indent': indent, + 'dst': dst, + 'src': src} + if type == 'uuid' and refTable: + return ("%(indent)s%(dst)s = %(src)s->header_.uuid;") % args + elif type == 'string': + return "%(indent)s%(dst)s = xstrdup(%(src)s);" % args + else: + return "%(indent)s%(dst)s = %(src)s;" % args + +def typeIsOptionalPointer(type): + return (type.min == 0 and type.max == 1 and not type.value + and (type.key == 'string' + or (type.key == 'uuid' and type.keyRefTable))) + +def cDeclComment(type): + if type.min == 1 and type.max == 1 and type.key == "string": + return "\t/* Always nonnull. */" + else: + return "" + +def cInitDefault(var, type, refTable, isOptional): + if type == 'uuid' and refTable: + return "%s = NULL;" % var + elif type == 'string' and not isOptional: + return "%s = \"\";" % var + else: + return {'integer': '%s = 0;', + 'real': '%s = 0.0;', + 'uuid': 'uuid_zero(&%s);', + 'boolean': '%s = false;', + 'string': '%s = NULL;'}[type] % var + +def constify(cType, const): + if (const + and cType.endswith('*') and not cType.endswith('**') + and (cType.startswith('struct uuid') or cType.startswith('char'))): + return 'const %s' % cType + else: + return cType + +def cMembers(prefix, columnName, column, const): + type = column.type + if type.min == 1 and type.max == 1: + singleton = True + pointer = '' + else: + singleton = False + if typeIsOptionalPointer(type): + pointer = '' + else: + pointer = '*' + + if type.value: + key = {'name': "key_%s" % columnName, + 'type': constify(cBaseType(prefix, type.key, type.keyRefTable) + pointer, const), + 'comment': ''} + value = {'name': "value_%s" % columnName, + 'type': constify(cBaseType(prefix, type.value, type.valueRefTable) + pointer, const), + 'comment': ''} + members = [key, value] + else: + m = {'name': columnName, + 'type': constify(cBaseType(prefix, type.key, type.keyRefTable) + pointer, const), + 'comment': cDeclComment(type)} + members = [m] + + if not singleton and not typeIsOptionalPointer(type): + members.append({'name': 'n_%s' % columnName, + 'type': 'size_t ', + 'comment': ''}) + return members + +def printCIDLHeader(schemaFile): + schema = parseSchema(schemaFile) + prefix = schema.idlPrefix print '''\ /* Generated automatically -- do not modify! -*- buffer-read-only: t -*- */ @@ -167,36 +288,371 @@ def printCIDLHeader(schema): #include #include #include +#include "ovsdb-idl-provider.h" #include "uuid.h"''' % {'prefix': prefix.upper()} + for tableName, table in schema.tables.iteritems(): + structName = "%s%s" % (prefix, tableName.lower()) + + print " " + print "/* %s table. */" % tableName + print "struct %s {" % structName + print "\tstruct ovsdb_idl_row header_;" + for columnName, column in table.columns.iteritems(): + print "\n\t/* %s column. */" % columnName + for member in cMembers(prefix, columnName, column, False): + print "\t%(type)s%(name)s;%(comment)s" % member + print "};" + + # Column indexes. + printEnum(["%s_COL_%s" % (structName.upper(), columnName.upper()) + for columnName in table.columns] + + ["%s_N_COLUMNS" % structName.upper()]) + print + for columnName in table.columns: + print "#define %(s)s_col_%(c)s (%(s)s_columns[%(S)s_COL_%(C)s])" % { + 's': structName, + 'S': structName.upper(), + 'c': columnName, + 'C': columnName.upper()} + + print "\nextern struct ovsdb_idl_column %s_columns[%s_N_COLUMNS];" % (structName, structName.upper()) + + print ''' +const struct %(s)s *%(s)s_first(const struct ovsdb_idl *); +const struct %(s)s *%(s)s_next(const struct %(s)s *); +#define %(S)s_FOR_EACH(ROW, IDL) for ((ROW) = %(s)s_first(IDL); (ROW); (ROW) = %(s)s_next(ROW)) + +void %(s)s_delete(const struct %(s)s *); +struct %(s)s *%(s)s_insert(struct ovsdb_idl_txn *); +''' % {'s': structName, 'S': structName.upper()} + + for columnName, column in table.columns.iteritems(): + print 'void %(s)s_verify_%(c)s(const struct %(s)s *);' % {'s': structName, 'c': columnName} + + print + for columnName, column in table.columns.iteritems(): + + print 'void %(s)s_set_%(c)s(const struct %(s)s *,' % {'s': structName, 'c': columnName}, + args = ['%(type)s%(name)s' % member for member + in cMembers(prefix, columnName, column, True)] + print '%s);' % ', '.join(args) + + # Table indexes. + printEnum(["%sTABLE_%s" % (prefix.upper(), tableName.upper()) for tableName in schema.tables] + ["%sN_TABLES" % prefix.upper()]) + print + for tableName in schema.tables: + print "#define %(p)stable_%(t)s (%(p)stable_classes[%(P)sTABLE_%(T)s])" % { + 'p': prefix, + 'P': prefix.upper(), + 't': tableName.lower(), + 'T': tableName.upper()} + print "\nextern struct ovsdb_idl_table_class %stable_classes[%sN_TABLES];" % (prefix, prefix.upper()) + + print "\nextern struct ovsdb_idl_class %sidl_class;" % prefix + print "\n#endif /* %(prefix)sIDL_HEADER */" % {'prefix': prefix.upper()} + +def printEnum(members): + if len(members) == 0: + return + + print "\nenum {"; + for member in members[:-1]: + print " %s," % member + print " %s" % members[-1] + print "};" + +def printCIDLSource(schemaFile): + schema = parseSchema(schemaFile) + prefix = schema.idlPrefix + print '''\ +/* Generated automatically -- do not modify! -*- buffer-read-only: t -*- */ + +#include +#include %s +#include +#include "ovsdb-data.h"''' % schema.idlHeader + + # Cast functions. + for tableName, table in schema.tables.iteritems(): + structName = "%s%s" % (prefix, tableName.lower()) + print ''' +static struct %(s)s * +%(s)s_cast(const struct ovsdb_idl_row *row) +{ + return row ? CONTAINER_OF(row, struct %(s)s, header_) : NULL; +}\ +''' % {'s': structName} + + + for tableName, table in schema.tables.iteritems(): + structName = "%s%s" % (prefix, tableName.lower()) + print " " if table.comment != None: print "/* %s table (%s). */" % (tableName, table.comment) else: print "/* %s table. */" % (tableName) - print "struct %s%s {" % (prefix, tableName.lower()) - print "\t/* Columns automatically included in every table. */" - print "\tstruct uuid uuid_;" - print "\tstruct uuid version_;" + + # Parse functions. + for columnName, column in table.columns.iteritems(): + print ''' +static void +%(s)s_parse_%(c)s(struct ovsdb_idl_row *row_, const struct ovsdb_datum *datum) +{ + struct %(s)s *row = %(s)s_cast(row_);''' % {'s': structName, + 'c': columnName} + + type = column.type + refKey = type.key == "uuid" and type.keyRefTable + refValue = type.value == "uuid" and type.valueRefTable + if type.value: + keyVar = "row->key_%s" % columnName + valueVar = "row->value_%s" % columnName + else: + keyVar = "row->%s" % columnName + valueVar = None + + if ((type.min == 1 and type.max == 1) or + typeIsOptionalPointer(type)): + print + print " if (datum->n >= 1) {" + if not refKey: + print " %s = datum->keys[0].%s;" % (keyVar, type.key) + else: + print " %s = %s%s_cast(ovsdb_idl_get_row_arc(row_, &%stable_classes[%sTABLE_%s], &datum->keys[0].uuid));" % (keyVar, prefix, type.keyRefTable.lower(), prefix, prefix.upper(), type.keyRefTable.upper()) + + if valueVar: + if refValue: + print " %s = datum->values[0].%s;" % (valueVar, type.value) + else: + print " %s = %s%s_cast(ovsdb_idl_get_row_arc(row_, &%stable_classes[%sTABLE_%s], &datum->values[0].uuid));" % (valueVar, prefix, type.valueRefTable.lower(), prefix, prefix.upper(), type.valueRefTable.upper()) + print " } else {" + print " %s" % cInitDefault(keyVar, type.key, type.keyRefTable, type.min == 0) + if valueVar: + print " %s" % cInitDefault(valueVar, type.value, type.valueRefTable, type.min == 0) + print " }" + else: + if type.max != 'unlimited': + print " size_t n = MIN(%d, datum->n);" % type.max + nMax = "n" + else: + nMax = "datum->n" + print " size_t i;" + print + print " %s = NULL;" % keyVar + if valueVar: + print " %s = NULL;" % valueVar + print " row->n_%s = 0;" % columnName + print " for (i = 0; i < %s; i++) {" % nMax + refs = [] + if refKey: + print " struct %s%s *keyRow = %s%s_cast(ovsdb_idl_get_row_arc(row_, &%stable_classes[%sTABLE_%s], &datum->keys[i].uuid));" % (prefix, type.keyRefTable.lower(), prefix, type.keyRefTable.lower(), prefix, prefix.upper(), type.keyRefTable.upper()) + keySrc = "keyRow" + refs.append('keyRow') + else: + keySrc = "datum->keys[i].%s" % type.key + if refValue: + print " struct %s%s *valueRow = %s%s_cast(ovsdb_idl_get_row_arc(row_, &%stable_classes[%sTABLE_%s], &datum->values[i].uuid));" % (prefix, type.valueRefTable.lower(), prefix, type.valueRefTable.lower(), prefix, prefix.upper(), type.valueRefTable.upper()) + valueSrc = "valueRow" + refs.append('valueRow') + elif valueVar: + valueSrc = "datum->values[i].%s" % type.value + if refs: + print " if (%s) {" % ' && '.join(refs) + indent = " " + else: + indent = " " + print "%sif (!row->n_%s) {" % (indent, columnName) + print "%s %s = xmalloc(%s * sizeof *%s);" % (indent, keyVar, nMax, keyVar) + if valueVar: + print "%s %s = xmalloc(%s * sizeof %s);" % (indent, valueVar, nMax, valueVar) + print "%s}" % indent + print "%s%s[row->n_%s] = %s;" % (indent, keyVar, columnName, keySrc) + if valueVar: + print "%s%s[row->n_%s] = %s;" % (indent, valueVar, columnName, valueSrc) + print "%srow->n_%s++;" % (indent, columnName) + if refs: + print " }" + print " }" + print "}" + + # Unparse functions. + for columnName, column in table.columns.iteritems(): + type = column.type + if (type.min != 1 or type.max != 1) and not typeIsOptionalPointer(type): + print ''' +static void +%(s)s_unparse_%(c)s(struct ovsdb_idl_row *row_) +{ + struct %(s)s *row = %(s)s_cast(row_); +''' % {'s': structName, 'c': columnName} + if type.value: + keyVar = "row->key_%s" % columnName + valueVar = "row->value_%s" % columnName + else: + keyVar = "row->%s" % columnName + valueVar = None + print " free(%s);" % keyVar + if valueVar: + print " free(%s);" % valueVar + print '}' + else: + print ''' +static void +%(s)s_unparse_%(c)s(struct ovsdb_idl_row *row UNUSED) +{ + /* Nothing to do. */ +}''' % {'s': structName, 'c': columnName} + + # First, next functions. + print ''' +const struct %(s)s * +%(s)s_first(const struct ovsdb_idl *idl) +{ + return %(s)s_cast(ovsdb_idl_first_row(idl, &%(p)stable_classes[%(P)sTABLE_%(T)s])); +} + +const struct %(s)s * +%(s)s_next(const struct %(s)s *row) +{ + return %(s)s_cast(ovsdb_idl_next_row(&row->header_)); +}''' % {'s': structName, + 'p': prefix, + 'P': prefix.upper(), + 'T': tableName.upper()} + + print ''' +void +%(s)s_delete(const struct %(s)s *row) +{ + ovsdb_idl_txn_delete(&row->header_); +} + +struct %(s)s * +%(s)s_insert(struct ovsdb_idl_txn *txn) +{ + return %(s)s_cast(ovsdb_idl_txn_insert(txn, &%(p)stable_classes[%(P)sTABLE_%(T)s])); +} +''' % {'s': structName, + 'p': prefix, + 'P': prefix.upper(), + 'T': tableName.upper()} + + # Verify functions. + for columnName, column in table.columns.iteritems(): + print ''' +void +%(s)s_verify_%(c)s(const struct %(s)s *row) +{ + ovsdb_idl_txn_verify(&row->header_, &%(s)s_columns[%(S)s_COL_%(C)s]); +}''' % {'s': structName, + 'S': structName.upper(), + 'c': columnName, + 'C': columnName.upper()} + + # Set functions. for columnName, column in table.columns.iteritems(): - print "\n\t/* %s column. */" % columnName type = column.type + print '\nvoid' + members = cMembers(prefix, columnName, column, True) + keyVar = members[0]['name'] + nVar = None + valueVar = None + if type.value: + valueVar = members[1]['name'] + if len(members) > 2: + nVar = members[2]['name'] + else: + if len(members) > 1: + nVar = members[1]['name'] + print '%(s)s_set_%(c)s(const struct %(s)s *row, %(args)s)' % \ + {'s': structName, 'c': columnName, + 'args': ', '.join(['%(type)s%(name)s' % m for m in members])} + print "{" + print " struct ovsdb_datum datum;" if type.min == 1 and type.max == 1: - singleton = True - pointer = '' + print + print " datum.n = 1;" + print " datum.keys = xmalloc(sizeof *datum.keys);" + print cCopyType(" ", "datum.keys[0].%s" % type.key, keyVar, type.key, type.keyRefTable) + if type.value: + print " datum.values = xmalloc(sizeof *datum.values);" + print cCopyType(" ", "datum.values[0].%s" % type.value, valueVar, type.value, type.valueRefTable) + else: + print " datum.values = NULL;" + elif typeIsOptionalPointer(type): + print + print " if (%s) {" % keyVar + print " datum.n = 1;" + print " datum.keys = xmalloc(sizeof *datum.keys);" + print cCopyType(" ", "datum.keys[0].%s" % type.key, keyVar, type.key, type.keyRefTable) + print " } else {" + print " datum.n = 0;" + print " datum.keys = NULL;" + print " }" + print " datum.values = NULL;" else: - singleton = False - pointer = '*' + print " size_t i;" + print + print " datum.n = %s;" % nVar + print " datum.keys = xmalloc(%s * sizeof *datum.keys);" % nVar + if type.value: + print " datum.values = xmalloc(%s * sizeof *datum.values);" % nVar + else: + print " datum.values = NULL;" + print " for (i = 0; i < %s; i++) {" % nVar + print cCopyType(" ", "datum.keys[i].%s" % type.key, "%s[i]" % keyVar, type.key, type.keyRefTable) + if type.value: + print cCopyType(" ", "datum.values[i].%s" % type.value, "%s[i]" % valueVar, type.value, type.valueRefTable) + print " }" + print " ovsdb_idl_txn_write(&row->header_, &%(s)s_columns[%(S)s_COL_%(C)s], &datum);" \ + % {'s': structName, + 'S': structName.upper(), + 'C': columnName.upper()} + print "}" + + # Table columns. + print "\nstruct ovsdb_idl_column %s_columns[%s_N_COLUMNS] = {" % ( + structName, structName.upper()) + for columnName, column in table.columns.iteritems(): + type = column.type + if type.value: - print "\tkey_%s%s%s;" % (cBaseType(prefix, type.key, type.keyRefTable), pointer, columnName) - print "\tvalue_%s%s%s;" % (cBaseType(prefix, type.value, type.valueRefTable), pointer, columnName) + valueTypeName = type.value.upper() + else: + valueTypeName = "VOID" + if type.max == "unlimited": + max = "UINT_MAX" else: - print "\t%s%s%s;" % (cBaseType(prefix, type.key, type.keyRefTable), pointer, columnName) - if not singleton: - print "\tsize_t n_%s;" % columnName + max = type.max + print """\ + {"%(c)s", + {OVSDB_TYPE_%(kt)s, OVSDB_TYPE_%(vt)s, %(min)s, %(max)s}, + %(s)s_parse_%(c)s, + %(s)s_unparse_%(c)s},""" % {'c': columnName, + 's': structName, + 'kt': type.key.upper(), + 'vt': valueTypeName, + 'min': type.min, + 'max': max} print "};" - print - print "#endif /* %(prefix)sIDL_HEADER */" % {'prefix': prefix.upper()} + + # Table classes. + print " " + print "struct ovsdb_idl_table_class %stable_classes[%sN_TABLES] = {" % (prefix, prefix.upper()) + for tableName, table in schema.tables.iteritems(): + structName = "%s%s" % (prefix, tableName.lower()) + print " {\"%s\"," % tableName + print " %s_columns, ARRAY_SIZE(%s_columns)," % ( + structName, structName) + print " sizeof(struct %s)}," % structName + print "};" + + # IDL class. + print "\nstruct ovsdb_idl_class %sidl_class = {" % prefix + print " %stable_classes, ARRAY_SIZE(%stable_classes)" % (prefix, prefix) + print "};" def ovsdb_escape(string): def escape(match): @@ -219,20 +675,36 @@ def ovsdb_escape(string): return '\\x%02x' % ord(c) return re.sub(r'["\\\000-\037]', escape, string) -def printOVSDBSchema(schema): - json.dump(schema.toJson(), sys.stdout, sort_keys=True, indent=2) +def printDoc(schemaFile): + schema = parseSchema(schemaFile) + print schema.name + if schema.comment: + print schema.comment + + for tableName, table in sorted(schema.tables.iteritems()): + title = "%s table" % tableName + print + print title + print '-' * len(title) + if table.comment: + print table.comment + + for columnName, column in sorted(table.columns.iteritems()): + print + print "%s (%s)" % (columnName, column.type.toEnglish()) + if column.comment: + print "\t%s" % column.comment def usage(): print """\ %(argv0)s: ovsdb schema compiler -usage: %(argv0)s [OPTIONS] ACTION SCHEMA -where SCHEMA is the ovsdb schema to read (in JSON format). +usage: %(argv0)s [OPTIONS] COMMAND ARG... -One of the following actions must specified: - validate validate schema without taking any other action - c-idl-header print C header file for IDL - c-idl-source print C source file for IDL implementation - ovsdb-schema print ovsdb parseable schema +The following commands are supported: + annotate SCHEMA ANNOTATIONS print SCHEMA combined with ANNOTATIONS + c-idl-header IDL print C header file for IDL + c-idl-source IDL print C source file for IDL implementation + doc IDL print schema documentation The following options are also available: -h, --help display this help message @@ -243,40 +715,49 @@ The following options are also available: if __name__ == "__main__": try: try: - options, args = getopt.gnu_getopt(sys.argv[1:], 'hV', - ['help', + options, args = getopt.gnu_getopt(sys.argv[1:], 'C:hV', + ['directory', + 'help', 'version']) except getopt.GetoptError, geo: sys.stderr.write("%s: %s\n" % (argv0, geo.msg)) sys.exit(1) + for key, value in options: + if key in ['-h', '--help']: + usage() + elif key in ['-V', '--version']: + print "ovsdb-idlc (Open vSwitch) @VERSION@" + elif key in ['-C', '--directory']: + os.chdir(value) + else: + sys.exit(0) + optKeys = [key for key, value in options] - if '-h' in optKeys or '--help' in optKeys: - usage() - elif '-V' in optKeys or '--version' in optKeys: - print "ovsdb-idlc (Open vSwitch) @VERSION@" - sys.exit(0) - - if len(args) != 2: - sys.stderr.write("%s: exactly two non-option arguments are " - "required (use --help for help)\n" % argv0) + + if not args: + sys.stderr.write("%s: missing command argument " + "(use --help for help)\n" % argv0) sys.exit(1) - action, inputFile = args - schema = parseSchema(inputFile) - if action == 'validate': - pass - elif action == 'ovsdb-schema': - printOVSDBSchema(schema) - elif action == 'c-idl-header': - printCIDLHeader(schema) - elif action == 'c-idl-source': - printCIDLSource(schema) - else: - sys.stderr.write( - "%s: unknown action '%s' (use --help for help)\n" % - (argv0, action)) + commands = {"annotate": (annotateSchema, 2), + "c-idl-header": (printCIDLHeader, 1), + "c-idl-source": (printCIDLSource, 1), + "doc": (printDoc, 1)} + + if not args[0] in commands: + sys.stderr.write("%s: unknown command \"%s\" " + "(use --help for help)\n" % (argv0, args[0])) sys.exit(1) + + func, n_args = commands[args[0]] + if len(args) - 1 != n_args: + sys.stderr.write("%s: \"%s\" requires %d arguments but %d " + "provided\n" + % (argv0, args[0], n_args, len(args) - 1)) + sys.exit(1) + + func(*args[1:]) except Error, e: sys.stderr.write("%s: %s\n" % (argv0, e.msg)) sys.exit(1)