From aa3d1b4689e6dadd982fe1e5ca8af69ca39c617d Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Wed, 15 Apr 2020 16:35:29 +0200
Subject: Added ext2 filesystem

---
 src/kernel/lib/string/strncmp.c | 16 ++++++++++++++++
 src/kernel/lib/string/strsep.c  | 25 +++++++++++++++++++++++++
 src/kernel/lib/string/strstr.c  | 25 +++++++++++++++++++++++++
 3 files changed, 66 insertions(+)
 create mode 100644 src/kernel/lib/string/strncmp.c
 create mode 100644 src/kernel/lib/string/strsep.c
 create mode 100644 src/kernel/lib/string/strstr.c

(limited to 'src/kernel/lib/string')

diff --git a/src/kernel/lib/string/strncmp.c b/src/kernel/lib/string/strncmp.c
new file mode 100644
index 0000000..4dbac59
--- /dev/null
+++ b/src/kernel/lib/string/strncmp.c
@@ -0,0 +1,16 @@
+int strncmp(const char *s1, const char *s2, int c)
+{
+	int result = 0;
+
+	while (c) {
+		result = *s1 - *s2++;
+
+		if ((result != 0) || (*s1++ == 0)) {
+			break;
+		}
+
+		c--;
+	}
+
+	return result;
+}
\ No newline at end of file
diff --git a/src/kernel/lib/string/strsep.c b/src/kernel/lib/string/strsep.c
new file mode 100644
index 0000000..8f5201e
--- /dev/null
+++ b/src/kernel/lib/string/strsep.c
@@ -0,0 +1,25 @@
+#include <stddef.h>
+
+char *strsep(char **stringp, const char *delim)
+{
+	char *s;
+	const char *spanp;
+	int c, sc;
+	char *tok;
+	if ((s = *stringp) == NULL)
+		return (NULL);
+	for (tok = s;;) {
+		c = *s++;
+		spanp = delim;
+		do {
+			if ((sc = *spanp++) == c) {
+				if (c == 0)
+					s = NULL;
+				else
+					s[-1] = 0;
+				*stringp = s;
+				return (tok);
+			}
+		} while (sc != 0);
+	}
+}
\ No newline at end of file
diff --git a/src/kernel/lib/string/strstr.c b/src/kernel/lib/string/strstr.c
new file mode 100644
index 0000000..d58b4d5
--- /dev/null
+++ b/src/kernel/lib/string/strstr.c
@@ -0,0 +1,25 @@
+#include <stdint.h>
+#include <kernel/lib/stdlib.h>
+
+char *strstr(const char *in, const char *str)
+{
+	char c;
+	uint32_t len;
+
+	c = *str++;
+	if (!c)
+		return (char *)in;
+
+	len = strlen(str);
+	do {
+		char sc;
+
+		do {
+			sc = *in++;
+			if (!sc)
+				return (char *)0;
+		} while (sc != c);
+	} while (strncmp(in, str, len) != 0);
+
+	return (char *)(in - 1);
+}
\ No newline at end of file
-- 
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