/*----- Header files ------------------------------------------------------*/
-#include <assert.h>
#include <string.h>
#include "buf.h"
+#include "growbuf.h"
#include "macros.h"
/*----- Main code ---------------------------------------------------------*/
* and ready for writing.
*/
-void dbuf_create(dbuf *db)
-{
- db->_b.base = db->_b.p = db->_b.limit = 0; db->_b.f = BF_ALLOC | BF_WRITE;
- db->a = &arena_stdlib; db->sz = 0;
-}
+void dbuf_create(dbuf *db) { DBCREATE(db); }
/* --- @dbuf_reset@ --- *
*
* Use: Release all of the resources held by a dynamic buffer.
*/
-void dbuf_destroy(dbuf *db)
-{
- if (db->_b.base) x_free(db->a, db->_b.base);
- dbuf_create(db);
-}
+void dbuf_destroy(dbuf *db) { DBDESTROY(db); }
/* --- @{,d}buf_break@ --- *
*
* Use: Marks a buffer as broken.
*/
-int buf_break(buf *b) { b->f |= BF_BROKEN; return (-1); }
-int (dbuf_break)(dbuf *db) { return (dbuf_break(db)); }
+int buf_break(buf *b) { BBREAK(b); return (-1); }
+int (dbuf_break)(dbuf *db) { DBBREAK(db); return (-1); }
/* --- @{,d}buf_flip@ --- *
*
*/
void buf_flip(buf *b) { BFLIP(b); }
-void (dbuf_flip)(dbuf *db) { dbuf_flip(db); }
+void (dbuf_flip)(dbuf *db) { DBFLIP(db); }
/* --- @{,d}buf_ensure@ --- *
*
int buf_tryextend(buf *b, size_t sz)
{
dbuf *db;
- size_t newsz, len;
-
- if (~b->f&(BF_ALLOC | BF_WRITE))
- { b->f |= BF_BROKEN; return (-1); }
- db = (dbuf *)b;
- len = BLEN(&db->_b); sz += len;
- if (db->sz >= sz)
- newsz = db->sz;
- else {
- newsz = db->sz ? 2*db->sz : 64;
- while (newsz < sz) { assert(newsz < ((size_t)-1)/2); newsz *= 2; }
- if (!db->_b.base) db->_b.base = x_alloc(db->a, newsz);
- else db->_b.base = x_realloc(db->a, db->_b.base, newsz, db->sz);
- db->_b.p = db->_b.base + len; db->sz = newsz;
+ size_t want, len;
+
+ if (sz <= BLEFT(b)) return (0);
+ if (~b->f&(BF_ALLOC | BF_WRITE)) { b->f |= BF_BROKEN; return (-1); }
+
+ db = (dbuf *)b; len = DBLEN(db); want = sz + len;
+ if (db->sz < want) {
+ GROWBUF_EXTEND(size_t, db->a, db->_b.base, db->sz, want, 64, 1);
+ db->_b.p = db->_b.base + len;
}
- db->_b.limit = db->_b.base + newsz;
+ db->_b.limit = db->_b.base + db->sz;
return (0);
}
int (dbuf_tryextend)(dbuf *db, size_t sz)
int (dbuf_put)(dbuf *db, const void *p, size_t sz)
{ return (dbuf_put(db, p, sz)); }
+/* --- @{,d}buf_fill@ --- *
+ *
+ * Arguments: @buf *b@ or @dbuf *db@ = pointer to a buffer block
+ * @int ch@ = fill character
+ * @size_t sz@ = size to fill
+ *
+ * Returns: Zero if it worked, nonzero if there wasn't enough space.
+ *
+ * Use: Write @sz@ bytes with value @ch@ to the buffer, as if with
+ * @memset@.
+ */
+
+int buf_fill(buf *b, int ch, size_t sz)
+{
+ void *p;
+
+ p = buf_get(b, sz); if (!p) return (-1);
+ if (sz) memset(p, ch, sz);
+ return (0);
+}
+int (dbuf_fill)(dbuf *db, int ch, size_t sz)
+ { return (dbuf_fill(db, ch, sz)); }
+
+/* --- @align_step@ --- *
+ *
+ * Arguments: @buf *b@ = pointer to a buffer block
+ * @size_t m, a@ = alignment parameters
+ *
+ * Returns: The number of bytes to skip or fill.
+ */
+
+static size_t align_step(buf *b, size_t m, size_t a)
+{
+ if (m < 2) return (0);
+ else if (!(m&(m - 1))) return ((a - BLEN(b))&(m - 1));
+ else return ((a + m - BLEN(b)%m)%m);
+}
+
+/* --- @{,d}buf_alignskip@ --- *
+ *
+ * Arguments: @buf *b@ or @dbuf *db@ = pointer to a buffer block
+ * @size_t m, a@ = alignment multiple and offset
+ *
+ * Returns: Zero if it worked, nonzero if there wasn't enough space.
+ *
+ * Use: Advance the buffer position as little as possible such that
+ * it is @a@ greater than a multiple of @m@. This doesn't write
+ * anything to the buffer, so it's probably not suitable for
+ * output: use @buf_alignfill@ instead.
+ */
+
+int buf_alignskip(buf *b, size_t m, size_t a)
+{
+ if (!buf_get(b, align_step(b, m, a))) return (-1);
+ else return (0);
+}
+int (dbuf_alignskip)(dbuf *db, size_t m, size_t a)
+ { return (dbuf_alignskip(db, m, a)); }
+
+/* --- @{,d}buf_alignfill@ --- *
+ *
+ * Arguments: @buf *b@ or @dbuf *db@ = pointer to a buffer block
+ * @int ch@ = fill character
+ * @size_t m, a@ = alignment multiple and offset
+ *
+ * Returns: Zero if it worked, nonzero if there wasn't enough space.
+ *
+ * Use: Fill the buffer with as few copies of @ch@ as possible, as if
+ * by @memset@, to advance the buffer position to a value @a@
+ * greater than a multiple of @m@.
+ */
+
+int buf_alignfill(buf *b, int ch, size_t m, size_t a)
+ { return (buf_fill(b, ch, align_step(b, m, a))); }
+int (dbuf_alignfill)(dbuf *db, int ch, size_t m, size_t a)
+ { return (dbuf_alignfill(db, ch, m, a)); }
+
/* --- @{,d}buf_getbyte@ --- *
*
* Arguments: @buf *b@ or @dbuf *db@ = pointer to a buffer block
{
octet *p;
- if ((p = memchr(BCUR(b), 0, BLEFT(b))) == 0) {
- buf_break(b);
- return (-1);
- }
+ if ((p = memchr(BCUR(b), 0, BLEFT(b))) == 0) { BBREAK(b); return (-1); }
*nn = p - BCUR(b) + 1;
return (0);
}
size_t n;
ASSIGN64(szmax, (size_t)-1);
- if (CMP64(k, >, szmax)) { buf_break(b); return (-1); }
+ if (CMP64(k, >, szmax)) { BBREAK(b); return (-1); }
n = GET64(size_t, k); *nn_out = n; return (buf_get(b, n));
}
{ \
MUFFLE_WARNINGS_STMT \
(CLANG_WARNING("-Wtautological-constant-out-of-range-compare"), \
- { assert(sz <= MASK##W); }); \
+ { if (sz > MASK##W) { BBREAK(b); return (-1); } }); \
if (buf_putu##w(b, sz) || buf_put(b, p, sz)) \
return (-1); \
return (0); \
{
octet *q;
- assert(!memchr(p, 0, n));
+ if (memchr(p, 0, n)) { BBREAK(b); return (-1); }
if ((q = buf_get(b, n + 1)) == 0)
return (-1);
memcpy(q, p, n);
~mdw / mLib / blobdiff