From 0a1937ed625804ebc413419979a45d855c6abcce Mon Sep 17 00:00:00 2001
From: Randy Jordan <randyjordan@email.com>
Date: Fri, 11 Jul 2025 09:38:59 -0500
Subject: [PATCH] casecmp

---
 include/sv.h          |  2 +-
 src/sv.c              | 17 ++++++++++++++++-
 tests/07_sv_casecmp.c | 16 ++++++++++++++++
 3 files changed, 33 insertions(+), 2 deletions(-)
 create mode 100644 tests/07_sv_casecmp.c

diff --git a/include/sv.h b/include/sv.h
index 7c7056a..84dd79d 100644
--- a/include/sv.h
+++ b/include/sv.h
@@ -23,5 +23,5 @@ SV sv_trim(SV s);
 SV sv_trim_left(SV s);
 SV sv_trim_right(SV s);
 int sv_cmp(const SV s1, const SV s2);
-
+int sv_casecmp(const SV s1, const SV s2);
 #endif
diff --git a/src/sv.c b/src/sv.c
index 5c92636..f25f1a6 100644
--- a/src/sv.c
+++ b/src/sv.c
@@ -5,6 +5,9 @@
 static bool is_space(int c) {
     return c == ' ' || c == '\t' || c == '\n' || c == '\r' || c == '\v' || c == '\f';
 }
+static int to_lower(char c) {
+  return (c >= 'A' && c <= 'Z') ? c + 'a' - 'A' : c;
+}
 
 SV sv_str(const char *s){
   SV str = {s == NULL ? 0 : strlen(s), (char *)s};
@@ -40,4 +43,16 @@ int sv_cmp(const SV s1, const SV s2){
     if (i < s2.len) return 0;
     return 0;
 }
-
+int sv_casecmp(const SV s1, const SV s2) {
+  size_t i = 0;
+  while (i < s1.len && i < s2.len){
+    int c1 = to_lower(s1.buf[i]);
+    int c2 = to_lower(s2.buf[i]);
+    if (c1 < c2) return -1;
+    if (c1 > c2) return 1;
+    i++;
+  }
+  if (i < s1.len) return 1;
+  if (i < s2.len) return -1;
+  return 0;
+}
diff --git a/tests/07_sv_casecmp.c b/tests/07_sv_casecmp.c
new file mode 100644
index 0000000..1da0c71
--- /dev/null
+++ b/tests/07_sv_casecmp.c
@@ -0,0 +1,16 @@
+#define DEBUG
+#include "../include/sv.h"
+#include "../include/except.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(void){
+    const char *s = "Hello World";
+    const char *s1 = "HElLo wOrLd";
+    SV sv = sv_strn(s,strlen(s));
+    SV sv1 = sv_strn(s1,strlen(s1));
+    ASSERTED(sv_casecmp(sv,sv1) == 0);
+    
+    return EXIT_SUCCESS;
+}