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printbuf_memset: maintain the NUL-termination invariant

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Manohar Paturi committed 2026-09-29 21:36:10 +05:30
1 parent 25895a587e
commit b5cd62dcad
1 file changed
+6 -2
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printbuf.c
+6 -2
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@@ -136,9 +136,12 @@ int printbuf_memset(struct printbuf *pb, int offset, int charvalue, int len)
return -1; return -1;
} }
size_needed = offset + len; size_needed = offset + len;
if (pb->size < size_needed) /* + 1 keeps the printbuf invariant that buf[bpos] is '\0' after every
* operation; without it, reading pb->buf as a C string right after an
* indent() consumes uninitialized bytes. */
if (pb->size < size_needed + 1)
{ {
if (printbuf_extend(pb, size_needed) < 0) if (printbuf_extend(pb, size_needed + 1) < 0)
return -1; return -1;
} }
@@ -147,6 +150,7 @@ int printbuf_memset(struct printbuf *pb, int offset, int charvalue, int len)
memset(pb->buf + offset, charvalue, len); memset(pb->buf + offset, charvalue, len);
if (pb->bpos < size_needed) if (pb->bpos < size_needed)
pb->bpos = size_needed; pb->bpos = size_needed;
pb->buf[pb->bpos] = '\0';
return 0; return 0;
} }