so://phie

diff --git a/src/buf.h b/src/buf.h
index c57b44e..13f1524 100644
--- a/src/buf.h
+++ b/src/buf.h

 1@@ -43,6 +43,9 @@ bool buf_write_len(buf_t *self, const void *bytes, size_t len);
 2 bool buf_write(buf_t *self, const void *bytes);
 3 void buf_writef(buf_t *self, const char *fmt, ...);
 4 bool buf_read(buf_t *self, void *bytes, size_t len);
 5+void buf_concat(buf_t *self, buf_t buf);
 6+void buf_repall_len(buf_t *self, const char *pat, const char *rep, size_t len);
 7+void buf_repall(buf_t *self, const char *pat, const char *rep);
 8 
 9 #ifdef BUF_IMPL
10 
11@@ -105,4 +108,38 @@ bool buf_read(buf_t *self, void *bytes, size_t len) {
12   return true;
13 }
14 
15+void buf_concat(buf_t *self, buf_t buf) {
16+  buf_write_len(self, buf.bytes, buf.len);
17+}
18+
19+void buf_repall_len(buf_t *self, const char *pat, const char *rep, size_t len) {
20+  if (!self || !self->bytes || !pat || !rep) return;
21+  const char *bytes = (const char *) self->bytes;
22+  size_t pat_len = strlen(pat);
23+  size_t rep_len = strlen(rep);
24+  if (pat_len == 0) return;
25+  buf_t out = BUF_NULL;
26+  size_t idx = 0;
27+  while (idx < len && *bytes) {
28+    size_t rem = len - idx;
29+    if (rem >= pat_len && strncmp(bytes, pat, pat_len) == 0) {
30+      buf_write_len(&out, rep, rep_len);
31+      bytes += pat_len;
32+      idx += pat_len;
33+    }
34+    else {
35+      buf_write_len(&out, bytes, 1);
36+      bytes++;
37+      idx++;
38+    }
39+  }
40+  buf_free(self);
41+  buf_write_len(self, out.bytes, out.len);
42+  buf_free(&out);
43+}
44+
45+void buf_repall(buf_t *self, const char *pat, const char *rep) {
46+  buf_repall_len(self, pat, rep, self->len);
47+}
48+
49 #endif /* BUF_IMPL */
50
51