casecmp

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

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;
+}

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;
+}