Cleanup source structure.

[apps/pfixtools.git] / common / buffer.c

diff --git a/common/buffer.c b/common/buffer.c
new file mode 100644 (file)
index 0000000..81855fd
--- /dev/null
+++ b/common/buffer.c
@@ -0,0 +1,110 @@
+/******************************************************************************/
+/*          pfixtools: a collection of postfix related tools                  */
+/*          ~~~~~~~~~                                                         */
+/*  ________________________________________________________________________  */
+/*                                                                            */
+/*  Redistribution and use in source and binary forms, with or without        */
+/*  modification, are permitted provided that the following conditions        */
+/*  are met:                                                                  */
+/*                                                                            */
+/*  1. Redistributions of source code must retain the above copyright         */
+/*     notice, this list of conditions and the following disclaimer.          */
+/*  2. Redistributions in binary form must reproduce the above copyright      */
+/*     notice, this list of conditions and the following disclaimer in the    */
+/*     documentation and/or other materials provided with the distribution.   */
+/*  3. The names of its contributors may not be used to endorse or promote    */
+/*     products derived from this software without specific prior written     */
+/*     permission.                                                            */
+/*                                                                            */
+/*  THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND   */
+/*  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE     */
+/*  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR        */
+/*  PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS    */
+/*  BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR    */
+/*  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF      */
+/*  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS  */
+/*  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN   */
+/*  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)   */
+/*  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF    */
+/*  THE POSSIBILITY OF SUCH DAMAGE.                                           */
+/******************************************************************************/
+
+/*
+ * Copyright © 2006-2007 Pierre Habouzit
+ */
+
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#include "mem.h"
+#include "buffer.h"
+
+#define BUFSIZ_INCREMENT  256
+
+void buffer_resize(buffer_t *buf, ssize_t newsize)
+{
+    p_allocgrow(&buf->data, newsize + 1, &buf->size);
+}
+
+ssize_t buffer_addvf(buffer_t *buf, const char *fmt, va_list ap)
+{
+    ssize_t len, avail = buf->size - buf->len;
+    va_list ap2;
+
+    va_copy(ap2, ap);
+
+    len = vsnprintf(buf->data + buf->len, avail, fmt, ap);
+    if (len >= avail) {
+        buffer_resize(buf, buf->len + len);
+        avail = buf->size - buf->len;
+        len = vsnprintf(buf->data + buf->len, avail, fmt, ap2);
+    }
+    buf->len += len;
+    buf->data[buf->len] = '\0';
+    va_end(ap2);
+    return len;
+}
+
+void buffer_consume(buffer_t *buf, ssize_t len)
+{
+    if (len <= 0)
+        return;
+
+    if (len >= buf->len) {
+        buffer_reset(buf);
+        return;
+    }
+
+    memmove(buf->data, buf->data + len, buf->len + 1 - len);
+    buf->len -= len;
+}
+
+ssize_t buffer_read(buffer_t *buf, int fd, ssize_t count)
+{
+    ssize_t res;
+
+    if (count < 0)
+        count = BUFSIZ;
+
+    buffer_ensure(buf, count);
+
+    res = read(fd, buf->data + buf->len, count);
+    if (res < 0) {
+        buf->data[buf->len] = '\0';
+        return res;
+    }
+
+    buffer_extend(buf, res);
+    return res;
+}
+
+ssize_t buffer_write(buffer_t *buf, int fd)
+{
+    ssize_t res = write(fd, buf->data, buf->len);
+    if (res < 0) {
+        return errno == EINTR || errno == EAGAIN ? 0 : -1;
+    }
+    buffer_consume(buf, res);
+    return res;
+}