sv_strstr

include/sv.h

@@ -24,7 +24,7 @@ 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);
-SV after_delim(const SV s, char *delims);
 SV before_delim(const SV s, char *delims);
-
+SV after_delim(const SV s, char *delims);
+SV sv_strstr(const SV haystack, const SV needle);
 #endif

src/sv.c

@@ -100,3 +100,14 @@ SV after_delim(const SV s, char *delims) {
     SV result = sv_strn(s.buf, i);
     return result;
 }
+SV sv_strstr(const SV haystack, const SV needle){
+    size_t i;
+    if (needle.len > haystack.len) return sv_strn(NULL,0);
+    if (needle.len == 0) return haystack;
+    for (i = 0; i <= haystack.len - needle.len; i++) {
+        if (memcmp(haystack.buf + i, needle.buf, needle.len) == 0) {
+            return sv_strn(haystack.buf + i, haystack.len -i);
+        }
+    }
+    return sv_strn(NULL,0);
+}

tests/10_sv_strstr.c

@@ -0,0 +1,22 @@
+#define DEBUG
+#include "../include/sv.h"
+#include "../include/except.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+int main(void){
+    const char *haystack = "Hello World, this is a test.";
+    const char *needle = "World,";
+    const char *result = "World, this is a test.";
+
+    SV sv_haystack = sv_strn(haystack,strlen(haystack));
+    SV sv_needle = sv_strn(needle,strlen(needle));
+    SV sv_res = sv_strn(result,strlen(result));
+
+    SV test = sv_strstr(sv_haystack,sv_needle);
+    
+    ASSERTED(sv_cmp(sv_res,test) == 0);
+
+    return EXIT_SUCCESS;
+}