add buffer_putsa, buffer_get_token_sa, buffer_getline_sa, stralloc_chomp

and stralloc_chop

buffer/buffer_get_token_sa.c

@@ -0,0 +1,22 @@
+#include "byte.h"
+#include "stralloc.h"
+#include "buffer.h"
+#include <errno.h>
+
+int buffer_get_token_sa(buffer* b,stralloc* sa,const char* charset,unsigned int setlen) {
+  sa->len=0;
+  for (;;) {
+    char x;
+    if (!stralloc_readyplus(sa,1)) goto nomem;
+    switch  (buffer_getc(b,&x)) {
+    case -1: return -1;
+    case 0: return 0;
+    }
+    stralloc_append(sa,&x);
+    if (byte_chr(charset,setlen,x)<setlen) break;
+  }
+  return 0;
+nomem:
+  errno=ENOMEM;
+  return -1;
+}