add assert.h

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/src/assert.c b/src/assert.c
new file mode 100644
index 0000000..b21f916
--- /dev/null
+++ b/src/assert.c
@@ -0,0 +1,58 @@
+/**
+ * slibc — Yet another C library
+ * Copyright © 2015  Mattias Andrée (maandree@member.fsf.org)
+ * 
+ * This program 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.
+ * 
+ * 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 <slibc/internals.h>
+#include <assert.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+
+
+/**
+ * The function that is called if an assertion fails.
+ * 
+ * @param  expression  The expression that failed, `NULL` if `assert_perror` failed
+ * @param  errnum      The code of the fatal error, 0 if `assert` failed
+ * @param  file        The filename of the source cose whence the assertion was made
+ * @param  line        The line in the source code whence the assertion was made
+ * @param  func        The function in the source code whence the assertion was made
+ */
+void
+__assert_fail(const char* expression, int errnum, const char* file, int line, const char* func)
+{
+  int tty = isatty(STDERR_FILENO);
+  
+  fprintf(stderr,
+	  _("%(\033[00;01m%)%s%(\033[00m%): "
+	    "%(\033[31m%)assertion error%(\033[00m%) "
+	    "at line %(\033[33m%)%i%(\033[00m%) "
+	    "of file %(\033[35m%)%s%(\033[00m%), "
+	    "function %(\033[34m%)%s%(\033[00m%): "
+	    "%(\033[31m%)%(exression failed: %)%s%(\033[00m%)\n"),
+	  tty, program_invocation_name, tty,
+	  tty, tty,
+	  tty, line, tty,
+	  tty, file, tty,
+	  tty, func, tty,
+	  tty, expression != NULL, (expression ? expression : stderror(errnum)), tty);
+  
+  abort();
+}
+