Initial data commit

Task/Longest-common-substring/C/longest-common-substring.c

@@ -0,0 +1,42 @@
+#include <stdio.h>
+
+void lcs(const char * const sa, const char * const sb, char ** const beg, char ** const end) {
+    size_t apos, bpos;
+    ptrdiff_t len;
+
+    *beg = 0;
+    *end = 0;
+    len = 0;
+
+    for (apos = 0; sa[apos] != 0; ++apos) {
+        for (bpos = 0; sb[bpos] != 0; ++bpos) {
+            if (sa[apos] == sb[bpos]) {
+                len = 1;
+                while (sa[apos + len] != 0 && sb[bpos + len] != 0 && sa[apos + len] == sb[bpos + len]) {
+                    len++;
+                }
+            }
+
+            if (len > *end - *beg) {
+                *beg = sa + apos;
+                *end = *beg + len;
+                len = 0;
+            }
+        }
+    }
+}
+
+int main() {
+    char *s1 = "thisisatest";
+    char *s2 = "testing123testing";
+    char *beg, *end, *it;
+
+    lcs(s1, s2, &beg, &end);
+
+    for (it = beg; it != end; it++) {
+        putchar(*it);
+    }
+    printf("\n");
+
+    return 0;
+}