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/strings/ffs.c         | 14 ++++++++++++++
 lib/libc/strings/ffsl.c        | 14 ++++++++++++++
 lib/libc/strings/ffsll.c       | 14 ++++++++++++++
 lib/libc/strings/strcasecmp.c  | 24 ++++++++++++++++++++++++
 lib/libc/strings/strncasecmp.c | 32 ++++++++++++++++++++++++++++++++
 5 files changed, 98 insertions(+)
 create mode 100644 lib/libc/strings/ffs.c
 create mode 100644 lib/libc/strings/ffsl.c
 create mode 100644 lib/libc/strings/ffsll.c
 create mode 100644 lib/libc/strings/strcasecmp.c
 create mode 100644 lib/libc/strings/strncasecmp.c

(limited to 'lib/libc/strings')

diff --git a/lib/libc/strings/ffs.c b/lib/libc/strings/ffs.c
new file mode 100644
index 00000000..3b836021
--- /dev/null
+++ b/lib/libc/strings/ffs.c
@@ -0,0 +1,14 @@
+int ffs(int i)
+{
+	if (i == 0)
+		return 0;
+
+	int pos = 1;
+	unsigned int u = (unsigned int)i;
+
+	while ((u & 1U) == 0U) {
+		u >>= 1;
+		pos++;
+	}
+	return pos;
+}
diff --git a/lib/libc/strings/ffsl.c b/lib/libc/strings/ffsl.c
new file mode 100644
index 00000000..2f2e7d44
--- /dev/null
+++ b/lib/libc/strings/ffsl.c
@@ -0,0 +1,14 @@
+int ffsl(long i)
+{
+	if (i == 0)
+		return 0;
+
+	int pos = 1;
+	unsigned long u = (unsigned long)i;
+
+	while ((u & 1UL) == 0UL) {
+		u >>= 1;
+		pos++;
+	}
+	return pos;
+}
diff --git a/lib/libc/strings/ffsll.c b/lib/libc/strings/ffsll.c
new file mode 100644
index 00000000..acfacb87
--- /dev/null
+++ b/lib/libc/strings/ffsll.c
@@ -0,0 +1,14 @@
+int ffsll(long long i)
+{
+	if (i == 0)
+		return 0;
+
+	int pos = 1;
+	unsigned long long u = (unsigned long long)i;
+
+	while ((u & 1ULL) == 0ULL) {
+		u >>= 1;
+		pos++;
+	}
+	return pos;
+}
diff --git a/lib/libc/strings/strcasecmp.c b/lib/libc/strings/strcasecmp.c
new file mode 100644
index 00000000..90ccc59b
--- /dev/null
+++ b/lib/libc/strings/strcasecmp.c
@@ -0,0 +1,24 @@
+#include <libc.h>
+#include <ctype.h>
+
+int strcasecmp(const char *s1, const char *s2)
+{
+	unsigned char c1, c2;
+
+	while (*s1 && *s2) {
+		c1 = (unsigned char)tolower((unsigned char)*s1);
+		c2 = (unsigned char)tolower((unsigned char)*s2);
+		if (c1 != c2)
+			return c1 - c2;
+		s1++;
+		s2++;
+	}
+
+	return (unsigned char)tolower((unsigned char)*s1) -
+	       (unsigned char)tolower((unsigned char)*s2);
+}
+
+weak int strcasecmp_l(const char *s1, const char *s2, locale_t unused locale)
+{
+	return strcasecmp(s1, s2);
+}
diff --git a/lib/libc/strings/strncasecmp.c b/lib/libc/strings/strncasecmp.c
new file mode 100644
index 00000000..679cf245
--- /dev/null
+++ b/lib/libc/strings/strncasecmp.c
@@ -0,0 +1,32 @@
+#include <libc.h>
+#include <ctype.h>
+#include <stddef.h>
+
+int strncasecmp(const char *s1, const char *s2, size_t n)
+{
+	unsigned char c1, c2;
+
+	if (n == 0)
+		return 0;
+
+	while (n-- > 0 && *s1 && *s2) {
+		c1 = (unsigned char)tolower((unsigned char)*s1);
+		c2 = (unsigned char)tolower((unsigned char)*s2);
+		if (c1 != c2)
+			return c1 - c2;
+		s1++;
+		s2++;
+	}
+
+	if (n == (size_t)-1)
+		return 0;
+
+	return (unsigned char)tolower((unsigned char)*s1) -
+	       (unsigned char)tolower((unsigned char)*s2);
+}
+
+weak int strncasecmp_l(const char *s1, const char *s2, size_t n,
+		       locale_t unused locale)
+{
+	return strncasecmp(s1, s2, n);
+}
-- 
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