CE interactive shell

libstring/string.c

@@ -1,3 +1,4 @@
+#include <stdbool.h>
 #include <stddef.h>
 #include <stdint.h>
 #include <string.h>
@@ -45,3 +46,47 @@ int memcmp (const void* s1, const void* s2, size_t n) {
   }
   return 0;
 }
+
+void strtokenize (const char* str, char delim, void* ctx, strtokenize_cb_func_t cb) {
+  const char* start = str;
+  const char* end;
+
+  while (*start) {
+    while (*start == delim && *start)
+      start++;
+
+    if (!*start)
+      break;
+
+    end = start;
+    while (*end != delim && *end)
+      end++;
+
+    if (!cb (ctx, start, (size_t)(end - start)))
+      break;
+
+    start = end;
+  }
+}
+
+/* https://stackoverflow.com/a/34873406 */
+int strcmp (const char* s1, const char* s2) {
+  while (*s1 && (*s1 == *s2)) {
+    s1++;
+    s2++;
+  }
+  return *(const unsigned char*)s1 - *(const unsigned char*)s2;
+}
+
+/* https://stackoverflow.com/a/2490637 */
+char* strcat (char* dest, const char* src) {
+  char* rdest = dest;
+
+  while (*dest)
+    dest++;
+
+  while ((*dest++ = *src++))
+    ;
+
+  return rdest;
+}