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/*
* Copyright (C) 2016 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program 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, see <http://www.gnu.org/licenses/>.
*
*/
#include "error.h"
// To get vasprintf
#define _GNU_SOURCE
#include "utils.h"
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <string.h>
static sc_error *sc_error_initv(const char *domain, int code, const char *msgfmt, va_list ap) {
// Set errno in case we die.
errno = 0;
sc_error *err = calloc(1, sizeof *err);
if (err == NULL) {
die("cannot allocate memory for error object");
}
err->domain = domain;
err->code = code;
if (vasprintf(&err->msg, msgfmt, ap) == -1) {
die("cannot format error message");
}
return err;
}
sc_error *sc_error_init(const char *domain, int code, const char *msgfmt, ...) {
va_list ap;
va_start(ap, msgfmt);
sc_error *err = sc_error_initv(domain, code, msgfmt, ap);
va_end(ap);
return err;
}
sc_error *sc_error_init_from_errno(int errno_copy, const char *msgfmt, ...) {
va_list ap;
va_start(ap, msgfmt);
sc_error *err = sc_error_initv(SC_ERRNO_DOMAIN, errno_copy, msgfmt, ap);
va_end(ap);
return err;
}
sc_error *sc_error_init_simple(const char *msgfmt, ...) {
va_list ap;
va_start(ap, msgfmt);
sc_error *err = sc_error_initv(SC_LIBSNAP_DOMAIN, SC_UNSPECIFIED_ERROR, msgfmt, ap);
va_end(ap);
return err;
}
sc_error *sc_error_init_api_misuse(const char *msgfmt, ...) {
va_list ap;
va_start(ap, msgfmt);
sc_error *err = sc_error_initv(SC_LIBSNAP_DOMAIN, SC_API_MISUSE, msgfmt, ap);
va_end(ap);
return err;
}
const char *sc_error_domain(sc_error *err) {
// Set errno in case we die.
errno = 0;
if (err == NULL) {
die("cannot obtain error domain from NULL error");
}
return err->domain;
}
int sc_error_code(sc_error *err) {
// Set errno in case we die.
errno = 0;
if (err == NULL) {
die("cannot obtain error code from NULL error");
}
return err->code;
}
const char *sc_error_msg(sc_error *err) {
// Set errno in case we die.
errno = 0;
if (err == NULL) {
die("cannot obtain error message from NULL error");
}
return err->msg;
}
void sc_error_free(sc_error *err) {
if (err != NULL) {
free(err->msg);
err->msg = NULL;
free(err);
}
}
void sc_cleanup_error(sc_error **ptr) {
sc_error_free(*ptr);
*ptr = NULL;
}
void sc_die_on_error(sc_error *error) {
if (error != NULL) {
if (strcmp(sc_error_domain(error), SC_ERRNO_DOMAIN) == 0) {
fprintf(stderr, "%s: %s\n", sc_error_msg(error), strerror(sc_error_code(error)));
} else {
fprintf(stderr, "%s\n", sc_error_msg(error));
}
sc_error_free(error);
exit(1);
}
}
int sc_error_forward(sc_error **recipient, sc_error *error) {
if (recipient != NULL) {
*recipient = error;
} else {
sc_die_on_error(error);
}
return error != NULL ? -1 : 0;
}
bool sc_error_match(sc_error *error, const char *domain, int code) {
// Set errno in case we die.
errno = 0;
if (domain == NULL) {
die("cannot match error to a NULL domain");
}
if (error == NULL) {
return false;
}
return strcmp(sc_error_domain(error), domain) == 0 && sc_error_code(error) == code;
}
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