libc: string: Add strcmp()

Signed-off-by: Ian Moffett <ian@osmora.org>

2 files changed, 52 insertions, 0 deletions

diff --git a/src/lib/libc/include/string.h b/src/lib/libc/include/string.h
index 11da895..bce2950 100644
--- a/src/lib/libc/include/string.h
+++ b/src/lib/libc/include/string.h
@@ -40,6 +40,16 @@
 size_t strlen(const char *s);
 
 /*
+ * Compare a string against another
+ *
+ * @s1: First string to compare
+ * @s2: Second string to compare
+ *
+ * Returns zero if strings are equal
+ */
+int strcmp(const char *s1, const char *s2);
+
+/*
  * Get the length of a string with a maximum
  * length
  *
diff --git a/src/lib/libc/src/string/strcmp.c b/src/lib/libc/src/string/strcmp.c
new file mode 100644
index 0000000..592830c
--- /dev/null
+++ b/src/lib/libc/src/string/strcmp.c
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2025 Ian Marco Moffett and L5 engineers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the project nor the names of its
+ *    contributors may be used to endorse or promote products derived from
+ *    this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <string.h>
+
+int
+strcmp(const char *s1, const char *s2)
+{
+    while (*s1 == *s2++) {
+        if (*s1++ == 0) {
+            return (0);
+        }
+    }
+
+    return (*(unsigned char *)s1 - *(unsigned char *)--s2);
+}