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include/sbuf.h

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+/**************************************************************************
+*
+* Copyright (C) 2012 Steve Karg <skarg@users.sourceforge.net>
+*
+* Permission is hereby granted, free of charge, to any person obtaining
+* a copy of this software and associated documentation files (the
+* "Software"), to deal in the Software without restriction, including
+* without limitation the rights to use, copy, modify, merge, publish,
+* distribute, sublicense, and/or sell copies of the Software, and to
+* permit persons to whom the Software is furnished to do so, subject to
+* the following conditions:
+*
+* The above copyright notice and this permission notice shall be included
+* in all copies or substantial portions of the Software.
+*
+* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*********************************************************************/
+#ifndef SBUF_H
+#define SBUF_H
+
+/* Functional Description: Static buffer library for deeply
+   embedded system. See the unit tests for usage examples. */
+
+#include <stdint.h>
+#include <stdbool.h>
+
+struct static_buffer_t {
+    char *data; /* block of memory or array of data */
+    unsigned size;      /* actual size, in bytes, of the block of data */
+    unsigned count;     /* number of bytes in use */
+};
+typedef struct static_buffer_t STATIC_BUFFER;
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+    void sbuf_init(
+        STATIC_BUFFER * b,      /* static buffer structure */
+        char *data,     /* data block */
+        unsigned size); /* actual size, in bytes, of the data block or array of data */
+
+    /* returns true if size==0, false if size > 0 */
+    bool sbuf_empty(
+        STATIC_BUFFER const *b);
+    /* returns the data block, or NULL if not initialized */
+    char *sbuf_data(
+        STATIC_BUFFER const *b);
+    /* returns the max size of the data block */
+    unsigned sbuf_size(
+        STATIC_BUFFER * b);
+    /* returns the number of bytes used in the data block */
+    unsigned sbuf_count(
+        STATIC_BUFFER * b);
+    /* returns true if successful, false if not enough room to append data */
+    bool sbuf_put(
+        STATIC_BUFFER * b,      /* static buffer structure */
+        unsigned offset,        /* where to start */
+        char *data,     /* data to add */
+        unsigned data_size);    /* how many to add */
+    /* returns true if successful, false if not enough room to append data */
+    bool sbuf_append(
+        STATIC_BUFFER * b,      /* static buffer structure */
+        char *data,     /* data to append */
+        unsigned data_size);    /* how many to append */
+    /* returns true if successful, false if count is bigger than size */
+    bool sbuf_truncate(
+        STATIC_BUFFER * b,      /* static buffer structure */
+        unsigned count);        /* new number of bytes used in buffer */
+
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+#endif