user: implement mlibc as the libc, finally.

It's finally done..

Signed-off-by: kaguya <vpshinomiya@protonmail.com>

ext2_root/usr/include/regex.h

@@ -0,0 +1,67 @@
+#ifndef _REGEX_H
+#define _REGEX_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stddef.h>
+
+typedef ptrdiff_t regoff_t;
+
+typedef struct re_pattern_buffer {
+	size_t re_nsub;
+	void *__opaque, *__padding[4];
+	size_t __nsub2;
+	char __padding2;
+} regex_t;
+
+typedef struct {
+	regoff_t rm_so;
+	regoff_t rm_eo;
+} regmatch_t;
+
+/* Flags for regcomp(). */
+#define REG_EXTENDED 1
+#define REG_ICASE 2
+#define REG_NEWLINE 4
+#define REG_NOSUB 8
+
+/* Flags for regexec(). */
+#define REG_NOTBOL 1
+#define REG_NOTEOL 2
+
+/* Errors for regcomp() and regexec(). */
+#define REG_OK 0
+#define REG_NOMATCH 1
+#define REG_BADPAT 2
+#define REG_ECOLLATE 3
+#define REG_ECTYPE 4
+#define REG_EESCAPE 5
+#define REG_ESUBREG 6
+#define REG_EBRACK 7
+#define REG_EPAREN 8
+#define REG_EBRACE 9
+#define REG_BADBR 10
+#define REG_ERANGE 11
+#define REG_ESPACE 12
+#define REG_BADRPT 13
+
+/* Obsolete in POSIX. */
+#define REG_ENOSYS -1
+
+#ifndef __MLIBC_ABI_ONLY
+
+int regcomp(regex_t *__restrict __regex, const char *__restrict __pattern, int __flags);
+int regexec(const regex_t *__restrict __regex, const char *__restrict __string, size_t __nmatch,
+		regmatch_t *__restrict __pmatch, int __flags);
+size_t regerror(int __errcode, const regex_t *__restrict __regex, char *__restrict __errbuf, size_t __errbuf_size);
+void regfree(regex_t *__regex);
+
+#endif /* !__MLIBC_ABI_ONLY */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif