diff options
Diffstat (limited to 'extension/errno.c')
| -rw-r--r-- | extension/errno.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/extension/errno.c b/extension/errno.c new file mode 100644 index 00000000..5dc15d79 --- /dev/null +++ b/extension/errno.c @@ -0,0 +1,143 @@ +/* + * errno.c - Builtin functions to map errno values. + */ + +/* + * Copyright (C) 2013 the Free Software Foundation, Inc. + * + * This file is part of GAWK, the GNU implementation of the + * AWK Programming Language. + * + * GAWK 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, or + * (at your option) any later version. + * + * GAWK is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA + */ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif + +#include <stdio.h> +#include <assert.h> +#include <errno.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include <sys/types.h> +#include <sys/stat.h> + +#include "gawkapi.h" + +#include "gettext.h" +#define _(msgid) gettext(msgid) +#define N_(msgid) msgid + +static const gawk_api_t *api; /* for convenience macros to work */ +static awk_ext_id_t *ext_id; +static const char *ext_version = "errno extension: version 1.0"; +static awk_bool_t (*init_func)(void) = NULL; + +int plugin_is_GPL_compatible; + +static const char *const errno2name[] = { +#define init_errno(A, B) [A] = B, +#include "errlist.h" +#undef init_errno +}; +#define NUMERR sizeof(errno2name)/sizeof(errno2name[0]) + +/* do_strerror --- call strerror */ + +static awk_value_t * +do_strerror(int nargs, awk_value_t *result) +{ + awk_value_t errnum; + + if (do_lint && nargs > 1) + lintwarn(ext_id, _("strerror: called with too many arguments")); + + if (get_argument(0, AWK_NUMBER, & errnum)) { + const char *str = gettext(strerror(errnum.num_value)); + return make_const_string(str, strlen(str), result); + } + if (do_lint) { + if (nargs == 0) + lintwarn(ext_id, _("strerror: called with no arguments")); + else + lintwarn(ext_id, _("strerror: called with inappropriate argument(s)")); + } + return make_null_string(result); +} + +/* do_errno2name --- convert an integer errno value to it's symbolic name */ + +static awk_value_t * +do_errno2name(int nargs, awk_value_t *result) +{ + awk_value_t errnum; + + if (do_lint && nargs > 1) + lintwarn(ext_id, _("errno2name: called with too many arguments")); + + if (get_argument(0, AWK_NUMBER, & errnum)) { + int i = errnum.num_value; + + if ((i == errnum.num_value) && (i >= 0) && ((size_t)i < NUMERR) && errno2name[i]) + return make_const_string(errno2name[i], strlen(errno2name[i]), result); + warning(ext_id, _("errno2name: called with invalid argument")); + } else if (do_lint) { + if (nargs == 0) + lintwarn(ext_id, _("errno2name: called with no arguments")); + else + lintwarn(ext_id, _("errno2name: called with inappropriate argument(s)")); + } + return make_null_string(result); +} + +/* do_name2errno --- convert a symbolic errno name to an integer */ + +static awk_value_t * +do_name2errno(int nargs, awk_value_t *result) +{ + awk_value_t err; + + if (do_lint && nargs > 1) + lintwarn(ext_id, _("name2errno: called with too many arguments")); + + if (get_argument(0, AWK_STRING, & err)) { + size_t i; + + for (i = 0; i < NUMERR; i++) { + if (errno2name[i] && ! strcasecmp(err.str_value.str, errno2name[i])) + return make_number(i, result); + } + warning(ext_id, _("name2errno: called with invalid argument")); + } else if (do_lint) { + if (nargs == 0) + lintwarn(ext_id, _("name2errno: called with no arguments")); + else + lintwarn(ext_id, _("name2errno: called with inappropriate argument(s)")); + } + return make_number(-1, result); +} + +static awk_ext_func_t func_table[] = { + { "strerror", do_strerror, 1 }, + { "errno2name", do_errno2name, 1 }, + { "name2errno", do_name2errno, 1 }, +}; + +/* define the dl_load function using the boilerplate macro */ + +dl_load_func(func_table, errno, "") |