util strbuf: Let skip() support an offset.

[sysdb.git] / src / utils / strbuf.c

diff --git a/src/utils/strbuf.c b/src/utils/strbuf.c
index 77d19f044d71a1fec89ec629877d0deda5b3585d..6190e3a8a045a650c26067a0d637003bf321ded9 100644 (file)
--- a/src/utils/strbuf.c
+++ b/src/utils/strbuf.c
@@ -283,19 +283,30 @@ sdb_strbuf_chomp(sdb_strbuf_t *strbuf)
 } /* sdb_strbuf_chomp */
 
 void
-sdb_strbuf_skip(sdb_strbuf_t *strbuf, size_t n)
+sdb_strbuf_skip(sdb_strbuf_t *strbuf, size_t offset, size_t n)
 {
+       char *start;
+       size_t len;
+
        if ((! strbuf) || (! n))
                return;
 
-       if (n >= strbuf->pos) {
-               strbuf->string[0] = '\0';
-               strbuf->pos = 0;
+       if (offset >= strbuf->pos)
+               return;
+
+       len = strbuf->pos - offset;
+
+       if (n >= len) {
+               strbuf->string[offset] = '\0';
+               strbuf->pos = offset;
                return;
        }
 
-       assert(n < strbuf->pos);
-       memmove(strbuf->string, strbuf->string + n, strbuf->pos - n);
+       assert(offset + n < strbuf->pos);
+       assert(offset < strbuf->pos);
+
+       start = strbuf->string + offset;
+       memmove(start, start + n, strbuf->pos - n);
        strbuf->pos -= n;
        strbuf->string[strbuf->pos] = '\0';
 } /* sdb_strbuf_skip */