From fc00c656c96528112d05cf0edf8631bd5eaea446 Mon Sep 17 00:00:00 2001
From: Kacper <kacper@mail.openlinux.dev>
Date: Sun, 7 Dec 2025 20:10:31 +0100
Subject: Add build system scaffolding and libc headers

---
 lib/libc/ctype/isalnum.c  | 12 ++++++++++++
 lib/libc/ctype/isalpha.c  |  8 ++++++++
 lib/libc/ctype/isblank.c  |  8 ++++++++
 lib/libc/ctype/iscntrl.c  |  8 ++++++++
 lib/libc/ctype/isdigit.c  |  8 ++++++++
 lib/libc/ctype/isgraph.c  |  8 ++++++++
 lib/libc/ctype/islower.c  |  8 ++++++++
 lib/libc/ctype/isprint.c  |  8 ++++++++
 lib/libc/ctype/ispunct.c  | 12 ++++++++++++
 lib/libc/ctype/isspace.c  |  8 ++++++++
 lib/libc/ctype/isupper.c  |  8 ++++++++
 lib/libc/ctype/isxdigit.c |  6 ++++++
 lib/libc/ctype/tolower.c  | 14 ++++++++++++++
 lib/libc/ctype/toupper.c  | 14 ++++++++++++++
 14 files changed, 130 insertions(+)
 create mode 100644 lib/libc/ctype/isalnum.c
 create mode 100644 lib/libc/ctype/isalpha.c
 create mode 100644 lib/libc/ctype/isblank.c
 create mode 100644 lib/libc/ctype/iscntrl.c
 create mode 100644 lib/libc/ctype/isdigit.c
 create mode 100644 lib/libc/ctype/isgraph.c
 create mode 100644 lib/libc/ctype/islower.c
 create mode 100644 lib/libc/ctype/isprint.c
 create mode 100644 lib/libc/ctype/ispunct.c
 create mode 100644 lib/libc/ctype/isspace.c
 create mode 100644 lib/libc/ctype/isupper.c
 create mode 100644 lib/libc/ctype/isxdigit.c
 create mode 100644 lib/libc/ctype/tolower.c
 create mode 100644 lib/libc/ctype/toupper.c

(limited to 'lib/libc/ctype')

diff --git a/lib/libc/ctype/isalnum.c b/lib/libc/ctype/isalnum.c
new file mode 100644
index 00000000..04e94fc6
--- /dev/null
+++ b/lib/libc/ctype/isalnum.c
@@ -0,0 +1,12 @@
+#include <libc.h>
+#include <ctype.h>
+
+int isalnum(int c)
+{
+	return isalpha(c) || isdigit(c);
+}
+
+weak int isalnum_l(int c, locale_t unused locale)
+{
+	return isalnum(c);
+}
diff --git a/lib/libc/ctype/isalpha.c b/lib/libc/ctype/isalpha.c
new file mode 100644
index 00000000..d046c09e
--- /dev/null
+++ b/lib/libc/ctype/isalpha.c
@@ -0,0 +1,8 @@
+#include <libc.h>
+
+int isalpha(int c)
+{
+	return ((unsigned)c | 32) - 'a' < 26;
+}
+
+weak_reference(isalpha, isalpha_l);
diff --git a/lib/libc/ctype/isblank.c b/lib/libc/ctype/isblank.c
new file mode 100644
index 00000000..7ad08709
--- /dev/null
+++ b/lib/libc/ctype/isblank.c
@@ -0,0 +1,8 @@
+#include <libc.h>
+
+int isblank(int c)
+{
+	return (c == ' ' || c == '\t');
+}
+
+weak_reference(isblank, isblank_l);
diff --git a/lib/libc/ctype/iscntrl.c b/lib/libc/ctype/iscntrl.c
new file mode 100644
index 00000000..6d4ff5a8
--- /dev/null
+++ b/lib/libc/ctype/iscntrl.c
@@ -0,0 +1,8 @@
+#include <libc.h>
+
+int iscntrl(int c)
+{
+	return (unsigned)c < 0x20 || c == 0x7f;
+}
+
+weak_reference(iscntrl, iscntrl_l);
diff --git a/lib/libc/ctype/isdigit.c b/lib/libc/ctype/isdigit.c
new file mode 100644
index 00000000..445e1cdc
--- /dev/null
+++ b/lib/libc/ctype/isdigit.c
@@ -0,0 +1,8 @@
+#include <libc.h>
+
+int isdigit(int c)
+{
+	return (unsigned)c - '0' < 10;
+}
+
+weak_reference(isdigit, isdigit_l);
diff --git a/lib/libc/ctype/isgraph.c b/lib/libc/ctype/isgraph.c
new file mode 100644
index 00000000..03919200
--- /dev/null
+++ b/lib/libc/ctype/isgraph.c
@@ -0,0 +1,8 @@
+#include <libc.h>
+
+int isgraph(int c)
+{
+	return (unsigned)c - 0x21 < 0x5e;
+}
+
+weak_reference(isgraph, isgraph_l);
diff --git a/lib/libc/ctype/islower.c b/lib/libc/ctype/islower.c
new file mode 100644
index 00000000..34980da6
--- /dev/null
+++ b/lib/libc/ctype/islower.c
@@ -0,0 +1,8 @@
+#include <libc.h>
+
+int islower(int c)
+{
+	return (unsigned)c - 'a' < 26;
+}
+
+weak_reference(islower, islower_l);
diff --git a/lib/libc/ctype/isprint.c b/lib/libc/ctype/isprint.c
new file mode 100644
index 00000000..76524050
--- /dev/null
+++ b/lib/libc/ctype/isprint.c
@@ -0,0 +1,8 @@
+#include <libc.h>
+
+int isprint(int c)
+{
+	return (unsigned)c - 0x20 < 0x5f;
+}
+
+weak_reference(isprint, isprint_l);
diff --git a/lib/libc/ctype/ispunct.c b/lib/libc/ctype/ispunct.c
new file mode 100644
index 00000000..2bd08c38
--- /dev/null
+++ b/lib/libc/ctype/ispunct.c
@@ -0,0 +1,12 @@
+#include <libc.h>
+#include <ctype.h>
+
+int ispunct(int c)
+{
+	return isgraph(c) && !isalnum(c);
+}
+
+weak int ispunct_l(int c, locale_t locale)
+{
+	return ispunct(c);
+}
diff --git a/lib/libc/ctype/isspace.c b/lib/libc/ctype/isspace.c
new file mode 100644
index 00000000..86630c66
--- /dev/null
+++ b/lib/libc/ctype/isspace.c
@@ -0,0 +1,8 @@
+#include <libc.h>
+
+int isspace(int c)
+{
+	return c == ' ' || (unsigned)c - '\t' < 5;
+}
+
+weak_reference(isspace, isspace_l);
diff --git a/lib/libc/ctype/isupper.c b/lib/libc/ctype/isupper.c
new file mode 100644
index 00000000..458990df
--- /dev/null
+++ b/lib/libc/ctype/isupper.c
@@ -0,0 +1,8 @@
+#include <libc.h>
+
+int isupper(int c)
+{
+	return (unsigned)c - 'A' < 26;
+}
+
+weak_reference(isupper, isupper_l);
diff --git a/lib/libc/ctype/isxdigit.c b/lib/libc/ctype/isxdigit.c
new file mode 100644
index 00000000..588df77a
--- /dev/null
+++ b/lib/libc/ctype/isxdigit.c
@@ -0,0 +1,6 @@
+#include <ctype.h>
+
+int isxdigit(int c)
+{
+	return isdigit(c) || ((unsigned)c | 32) - 'a' < 6;
+}
diff --git a/lib/libc/ctype/tolower.c b/lib/libc/ctype/tolower.c
new file mode 100644
index 00000000..abeab42a
--- /dev/null
+++ b/lib/libc/ctype/tolower.c
@@ -0,0 +1,14 @@
+#include <libc.h>
+#include <ctype.h>
+
+int tolower(int c)
+{
+	if (isupper(c))
+		return c | 32;
+	return c;
+}
+
+weak int tolower_l(int c, locale_t unused locale)
+{
+	return tolower(c);
+}
diff --git a/lib/libc/ctype/toupper.c b/lib/libc/ctype/toupper.c
new file mode 100644
index 00000000..e952acd9
--- /dev/null
+++ b/lib/libc/ctype/toupper.c
@@ -0,0 +1,14 @@
+#include <libc.h>
+#include <ctype.h>
+
+int toupper(int c)
+{
+	if (islower(c))
+		return c & 0x5f;
+	return c;
+}
+
+int toupper_l(int c, locale_t unused locale)
+{
+	return toupper(c);
+}
-- 
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