error: remove and use standard errno codes instead

This change also adds strerror to string.h.

2 files changed, 34 insertions, 0 deletions

diff --git a/include/errno.h b/include/errno.h
new file mode 100644
index 0000000..d935f1c
--- /dev/null
+++ b/include/errno.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2017-2018 Richard Braun.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#ifndef _ERRNO_H
+#define _ERRNO_H
+
+#define EINVAL      1
+#define EAGAIN      2
+#define ENOMEM      3
+#define EIO         4
+#define EBUSY       5
+#define EEXIST      6
+
+#endif /* _ERRNO_H */
diff --git a/include/string.h b/include/string.h
index 3f7c87e..fc17482 100644
--- a/include/string.h
+++ b/include/string.h
@@ -31,5 +31,6 @@ char * strcpy(char *dest, const char *src);
 size_t strlen(const char *s);
 int strcmp(const char *s1, const char *s2);
 int strncmp(const char *s1, const char *s2, size_t n);
+char * strerror(int errnum);
 
 #endif /* _STRING_H */