1 files changed, 114 insertions, 0 deletions
diff --git a/src/buffer.h b/src/buffer.h
new file mode 100644
index 0000000..1bc1eee
--- /dev/null
+++ b/src/buffer.h
@@ -0,0 +1,114 @@
+#ifndef INCLUDE_buffer_h__
+#define INCLUDE_buffer_h__
+
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdarg.h>
+#include <sys/types.h>
+
+typedef struct {
+	unsigned char *ptr;
+	int asize, size;
+} strbuf;
+
+extern unsigned char strbuf__initbuf[];
+extern unsigned char strbuf__oom[];
+
+#define GH_BUF_INIT { strbuf__initbuf, 0, 0 }
+
+/**
+ * Initialize a strbuf structure.
+ *
+ * For the cases where GH_BUF_INIT cannot be used to do static
+ * initialization.
+ */
+extern void strbuf_init(strbuf *buf, int initial_size);
+
+/**
+ * Attempt to grow the buffer to hold at least `target_size` bytes.
+ *
+ * If the allocation fails, this will return an error.  If mark_oom is true,
+ * this will mark the buffer as invalid for future operations; if false,
+ * existing buffer content will be preserved, but calling code must handle
+ * that buffer was not expanded.
+ */
+extern int strbuf_try_grow(strbuf *buf, int target_size, bool mark_oom);
+
+/**
+ * Grow the buffer to hold at least `target_size` bytes.
+ *
+ * If the allocation fails, this will return an error and the buffer will be
+ * marked as invalid for future operations, invaliding contents.
+ *
+ * @return 0 on success or -1 on failure
+ */
+static inline int strbuf_grow(strbuf *buf, int target_size)
+{
+	return strbuf_try_grow(buf, target_size, true);
+}
+
+extern void strbuf_free(strbuf *buf);
+extern void strbuf_swap(strbuf *buf_a, strbuf *buf_b);
+
+/**
+ * Test if there have been any reallocation failures with this strbuf.
+ *
+ * Any function that writes to a strbuf can fail due to memory allocation
+ * issues.  If one fails, the strbuf will be marked with an OOM error and
+ * further calls to modify the buffer will fail.  Check strbuf_oom() at the
+ * end of your sequence and it will be true if you ran out of memory at any
+ * point with that buffer.
+ *
+ * @return false if no error, true if allocation error
+ */
+static inline bool strbuf_oom(const strbuf *buf)
+{
+	return (buf->ptr == strbuf__oom);
+}
+
+
+static inline size_t strbuf_len(const strbuf *buf)
+{
+	return buf->size;
+}
+
+extern int strbuf_cmp(const strbuf *a, const strbuf *b);
+
+extern void strbuf_attach(strbuf *buf, unsigned char *ptr, int asize);
+extern unsigned char *strbuf_detach(strbuf *buf);
+extern void strbuf_copy_cstr(char *data, int datasize, const strbuf *buf);
+
+static inline const char *strbuf_cstr(const strbuf *buf)
+{
+	return (char *)buf->ptr;
+}
+
+#define strbuf_at(buf, n) ((buf)->ptr[n])
+
+/*
+ * Functions below that return int value error codes will return 0 on
+ * success or -1 on failure (which generally means an allocation failed).
+ * Using a strbuf where the allocation has failed with result in -1 from
+ * all further calls using that buffer.  As a result, you can ignore the
+ * return code of these functions and call them in a series then just call
+ * strbuf_oom at the end.
+ */
+extern int strbuf_set(strbuf *buf, const unsigned char *data, int len);
+extern int strbuf_sets(strbuf *buf, const char *string);
+extern int strbuf_putc(strbuf *buf, int c);
+extern int strbuf_put(strbuf *buf, const unsigned char *data, int len);
+extern int strbuf_puts(strbuf *buf, const char *string);
+extern int strbuf_printf(strbuf *buf, const char *format, ...)
+	__attribute__((format (printf, 2, 3)));
+extern int strbuf_vprintf(strbuf *buf, const char *format, va_list ap);
+extern void strbuf_clear(strbuf *buf);
+
+int strbuf_strchr(const strbuf *buf, int c, int pos);
+int strbuf_strrchr(const strbuf *buf, int c, int pos);
+void strbuf_drop(strbuf *buf, int n);
+void strbuf_truncate(strbuf *buf, int len);
+void strbuf_trim(strbuf *buf);
+void strbuf_normalize_whitespace(strbuf *s);
+void strbuf_unescape(strbuf *s);
+
+#endif