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diff --git a/src/yasl.h b/src/yasl.h
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+/* yasl, Yet Another String Library for C
+ *
+ * Copyright (c) 2006-2014, Salvatore Sanfilippo <antirez at gmail dot com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   * Redistributions of source code must retain the above copyright notice,
+ *     this list of conditions and the following disclaimer.
+ *   * 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.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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.
+ */
+
+#ifndef YASL_H
+#define YASL_H
+
+#define YASL_MAX_PREALLOC (1024*1024)
+
+#include <stdarg.h>
+#include <stddef.h>
+#include <sys/types.h>
+
+typedef char *yastr;
+
+struct yastrhdr {
+	size_t len;
+	size_t free;
+	char buf[];
+};
+
+
+/**
+ * User API function prototypes
+ */
+
+/// Initialization
+yastr  yaslnew(const void *init, size_t initlen);
+yastr  yasldup(const yastr s);
+yastr  yaslempty(void);
+yastr  yaslfromlonglong(long long value);
+
+
+/// Querying
+int    yaslcmp(const yastr s1, const yastr s2);
+
+
+/// Modification
+void   yaslclear(yastr s);
+yastr  yaslgrowzero(yastr s, size_t len);
+yastr  yaslcpylen(yastr s, const char *t, size_t len);
+yastr  yaslcpy(yastr s, const char *t);
+yastr  yasljoin(char **argv, int argc, char *sep, size_t seplen);
+yastr  yasljoinyasl(yastr *argv, int argc, const char *sep, size_t seplen);
+yastr  yaslmapchars(yastr s, const char *from, const char *to, size_t setlen);
+void   yaslrange(yastr s, ptrdiff_t start, ptrdiff_t end);
+void   yasltolower(yastr s);
+void   yasltoupper(yastr s);
+void   yasltrim(yastr s, const char *cset);
+void   yaslupdatelen(yastr s);
+yastr *yaslsplitargs(const char *line, int *argc);
+yastr *yaslsplitlen(const char *s, size_t len, const char *sep, size_t seplen, size_t *count);
+
+// Concatenation
+yastr  yaslcat(yastr s, const char *t);
+yastr  yaslcatyasl(yastr s, const yastr t);
+yastr  yaslcatlen(yastr s, const void *t, size_t len);
+yastr  yaslcatrepr(yastr s, const char *p, size_t len);
+yastr  yaslcatvprintf(yastr s, const char *fmt, va_list ap);
+#ifdef __GNUC__
+yastr  yaslcatprintf(yastr s, const char *fmt, ...)
+            __attribute__((format(printf, 2, 3)));
+#else
+yastr  yaslcatprintf(yastr s, const char *fmt, ...);
+#endif
+
+
+/// Freeing
+void   yaslfree(yastr s);
+void   yaslfreesplitres(yastr *tokens, size_t count);
+
+
+/// Low-level API function prototypes
+size_t yaslAllocSize(yastr s);
+void   yaslIncrLen(yastr s, size_t incr);
+yastr  yaslMakeRoomFor(yastr s, size_t addlen);
+yastr  yaslRemoveFreeSpace(yastr s);
+
+
+/// Low-level helper functions
+int    is_hex_digit(char c);
+int    hex_digit_to_int(char c);
+
+
+/**
+ * Inline functions
+ */
+
+static inline struct yastrhdr *yaslheader(const yastr s) {
+	/* The yastrhdr pointer has a different alignment than the original char
+	 * pointer, so cast it through a void pointer to silence the warning. */
+	return (void *)(s - (sizeof (struct yastrhdr)));
+}
+
+static inline yastr yaslauto(const char *s) {
+	return yaslnew(s, s ? strlen(s) : 0);
+}
+
+static inline size_t yaslavail(const yastr s) {
+	return yaslheader(s)->free;
+}
+
+static inline size_t yasllen(const yastr s) {
+	return yaslheader(s)->len;
+}
+
+
+#endif