bstr: add bstr_xappend function

Apparently this can be really useful when being paranoid and trying to
avoid too much malloc/realloc, since it can be used to appending into a
buffer (with transparent realloc only if the buffer is too small).

1 files changed, 8 insertions, 0 deletions

diff --git a/bstr/bstr.h b/bstr/bstr.h
index 67e85655c4..71d5d473c4 100644
--- a/bstr/bstr.h
+++ b/bstr/bstr.h
@@ -23,8 +23,10 @@
 #include <stddef.h>
 #include <string.h>
 #include <stdbool.h>
+#include <stdarg.h>
 
 #include "talloc.h"
+#include "compat/compiler.h"
 
 /* NOTE: 'len' is size_t, but most string-handling functions below assume
  * that input size has been sanity checked and len fits in an int.
@@ -118,6 +120,12 @@ struct bstr bstr_getline(struct bstr str, struct bstr *rest);
 // and will remove the trailing \n or \r\n sequence.
 struct bstr bstr_strip_linebreaks(struct bstr str);
 
+void bstr_xappend(void *talloc_ctx, bstr *s, bstr append);
+void bstr_xappend_asprintf(void *talloc_ctx, bstr *s, const char *fmt, ...)
+    PRINTF_ATTRIBUTE(3, 4);
+void bstr_xappend_vasprintf(void *talloc_ctx, bstr *s, const char *fmt, va_list va)
+    PRINTF_ATTRIBUTE(3, 0);
+
 // If s starts with prefix, return true and return the rest of the string in s.
 bool bstr_eatstart(struct bstr *s, struct bstr prefix);