From 55f32781ea611873a08f195d437fc0123919d685 Mon Sep 17 00:00:00 2001
From: Xavier Del Campo Romero <xavi92@disroot.org>
Date: Sun, 6 Jul 2025 22:11:12 +0200
Subject: Setup libc skeleton

---
 src/libc/include/errno.h  | 43 +++++++++++++++++++++++++++++++++++++++++++
 src/libc/include/stddef.h |  8 --------
 src/libc/include/stdio.h  | 17 +++++++++++++++++
 src/libc/include/stdlib.h |  6 ++++++
 src/libc/include/string.h |  1 +
 5 files changed, 67 insertions(+), 8 deletions(-)
 create mode 100644 src/libc/include/errno.h
 delete mode 100644 src/libc/include/stddef.h
 create mode 100644 src/libc/include/stdio.h

(limited to 'src/libc/include')

diff --git a/src/libc/include/errno.h b/src/libc/include/errno.h
new file mode 100644
index 0000000..0456645
--- /dev/null
+++ b/src/libc/include/errno.h
@@ -0,0 +1,43 @@
+#ifndef _ERRNO_H
+#define _ERRNO_H
+
+extern int errno;
+
+enum
+{
+    OK,
+    EPERM,
+    ENOENT,
+    ESRCH,
+    EINTR,
+    EIO,
+    ENXIO,
+    E2BIG,
+    ENOEXEC,
+    EBADF,
+    ECHILD,
+    EAGAIN,
+    ENOMEM,
+    EACCES,
+    EFAULT,
+    ENOTBLK,
+    EBUSY,
+    EEXIST,
+    EXDEV,
+    ENODEV,
+    ENOTDIR,
+    EISDIR,
+    EINVAL,
+    ENFILE,
+    EMFILE,
+    ENOTTY,
+    ETXTBSY,
+    EFBIG,
+    ENOSPC,
+    ESPIPE,
+    EROFS,
+    EMLINK,
+    EPIPE,
+};
+
+#endif
diff --git a/src/libc/include/stddef.h b/src/libc/include/stddef.h
deleted file mode 100644
index 123e46f..0000000
--- a/src/libc/include/stddef.h
+++ /dev/null
@@ -1,8 +0,0 @@
-#ifndef _STDDEF_H
-#define _STDDEF_H
-
-#define NULL ((void *)0)
-
-typedef unsigned long size_t;
-
-#endif
diff --git a/src/libc/include/stdio.h b/src/libc/include/stdio.h
new file mode 100644
index 0000000..91d440b
--- /dev/null
+++ b/src/libc/include/stdio.h
@@ -0,0 +1,17 @@
+#ifndef _STDIO_H
+#define _STDIO_H
+
+enum
+{
+    EOF = -1
+};
+
+typedef struct __file FILE;
+
+FILE *fopen(const char *__path, const char *__mode);
+int printf(const char *__fmt, ...);
+int fprintf(FILE *__stream, const char *__fmt, ...);
+
+extern FILE *stdin, *stdout, *stderr;
+
+#endif
diff --git a/src/libc/include/stdlib.h b/src/libc/include/stdlib.h
index 79d3122..839c868 100644
--- a/src/libc/include/stdlib.h
+++ b/src/libc/include/stdlib.h
@@ -1,7 +1,13 @@
 #ifndef _STDLIB_H
 #define _STDLIB_H
 
+#include <stddef.h>
+
 #define EXIT_SUCCESS 0
 #define EXIT_FAILURE 1
 
+void *malloc(size_t __n);
+void *calloc(size_t __nemb, size_t __size);
+void free(void *__p);
+
 #endif
diff --git a/src/libc/include/string.h b/src/libc/include/string.h
index 7efda4e..20c9cf3 100644
--- a/src/libc/include/string.h
+++ b/src/libc/include/string.h
@@ -7,6 +7,7 @@ int memcmp(const void *__s1, const void *__s2, size_t __n);
 void *memcpy(void *__dst, const void *__src, size_t __n);
 void *memset(void *__dst, int __c, size_t __n);
 char *strchr(const char *__s, int __n);
+char *strerror(int errnum);
 size_t strlen(const char *__s);
 
 #endif
-- 
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