--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/ucx/string.h Mon Feb 04 17:49:50 2019 +0100
@@ -0,0 +1,934 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2017 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * 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.
+ *
+ * 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 HOLDER 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.
+ */
+/**
+ * Bounded string implementation.
+ *
+ * The UCX strings (<code>sstr_t</code>) provide an alternative to C strings.
+ * The main difference to C strings is, that <code>sstr_t</code> does <b>not
+ * need to be <code>NULL</code>-terminated</b>. Instead the length is stored
+ * within the structure.
+ *
+ * When using <code>sstr_t</code>, developers must be full aware of what type
+ * of string (<code>NULL</code>-terminated) or not) they are using, when
+ * accessing the <code>char* ptr</code> directly.
+ *
+ * The UCX string module provides some common string functions, known from
+ * standard libc, working with <code>sstr_t</code>.
+ *
+ * @file string.h
+ * @author Mike Becker
+ * @author Olaf Wintermann
+ */
+
+#ifndef UCX_STRING_H
+#define UCX_STRING_H
+
+#include "ucx.h"
+#include "allocator.h"
+#include <stddef.h>
+
+/*
+ * Use this macro to disable the shortcuts if you experience macro collision.
+ */
+#ifndef UCX_NO_SSTR_SHORTCUTS
+/**
+ * Shortcut for a <code>sstr_t struct</code>
+ * or <code>scstr_t struct</code> literal.
+ */
+#define ST(s) { s, sizeof(s)-1 }
+
+/** Shortcut for the conversion of a C string to a <code>sstr_t</code>. */
+#define S(s) sstrn(s, sizeof(s)-1)
+
+/** Shortcut for the conversion of a C string to a <code>scstr_t</code>. */
+#define SC(s) scstrn(s, sizeof(s)-1)
+#endif /* UCX_NO_SSTR_SHORTCUTS */
+
+/*
+ * Use this macro to disable the format macros.
+ */
+#ifndef UCX_NO_SSTR_FORMAT_MACROS
+/** Expands a sstr_t or scstr_t to printf arguments. */
+#define SFMT(s) (int) (s).length, (s).ptr
+
+/** Format specifier for a sstr_t or scstr_t. */
+#define PRIsstr ".*s"
+#endif /* UCX_NO_SSTR_FORMAT_MACROS */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+/**
+ * The UCX string structure.
+ */
+typedef struct {
+ /** A pointer to the string
+ * (<b>not necessarily <code>NULL</code>-terminated</b>) */
+ char *ptr;
+ /** The length of the string */
+ size_t length;
+} sstr_t;
+
+/**
+ * The UCX string structure for immutable (constant) strings.
+ */
+typedef struct {
+ /** A constant pointer to the immutable string
+ * (<b>not necessarily <code>NULL</code>-terminated</b>) */
+ const char *ptr;
+ /** The length of the string */
+ size_t length;
+} scstr_t;
+
+#ifdef __cplusplus
+}
+#endif
+
+
+#ifdef __cplusplus
+/**
+ * One of two type adjustment functions that return a scstr_t.
+ *
+ * Used <b>internally</b> to convert a UCX string to an immutable UCX string.
+ *
+ * <b>Do not use this function manually.</b>
+ *
+ * @param str some sstr_t
+ * @return an immutable (scstr_t) version of the provided string.
+ */
+inline scstr_t s2scstr(sstr_t s) {
+ scstr_t c;
+ c.ptr = s.ptr;
+ c.length = s.length;
+ return c;
+}
+
+/**
+ * One of two type adjustment functions that return a scstr_t.
+ *
+ * Used <b>internally</b> to convert a UCX string to an immutable UCX string.
+ * This variant is used, when the string is already immutable and no operation
+ * needs to be performed.
+ *
+ * <b>Do not use this function manually.</b>
+ *
+ * @param str some scstr_t
+ * @return the argument itself
+ */
+inline scstr_t s2scstr(scstr_t str) {
+ return str;
+}
+
+/**
+ * Converts a UCX string to an immutable UCX string (scstr_t).
+ * @param str some UCX string
+ * @return the an immutable version of the provided string
+ */
+#define SCSTR(s) s2scstr(s)
+#else
+
+/**
+ * One of two type adjustment functions that return a scstr_t.
+ *
+ * Used <b>internally</b> to convert a UCX string to an immutable UCX string.
+ * This variant is used, when the string is already immutable and no operation
+ * needs to be performed.
+ *
+ * <b>Do not use this function manually.</b>
+ *
+ * @param str some scstr_t
+ * @return the argument itself
+ */
+scstr_t ucx_sc2sc(scstr_t str);
+
+/**
+ * One of two type adjustment functions that return a scstr_t.
+ *
+ * Used <b>internally</b> to convert a UCX string to an immutable UCX string.
+ *
+ * <b>Do not use this function manually.</b>
+ *
+ * @param str some sstr_t
+ * @return an immutable (scstr_t) version of the provided string.
+ */
+scstr_t ucx_ss2sc(sstr_t str);
+
+#if __STDC_VERSION__ >= 201112L
+/**
+ * Converts a UCX string to an immutable UCX string (scstr_t).
+ * @param str some UCX string
+ * @return the an immutable version of the provided string
+ */
+#define SCSTR(str) _Generic(str, sstr_t: ucx_ss2sc, scstr_t: ucx_sc2sc)(str)
+
+#elif defined(__GNUC__) || defined(__clang__)
+
+/**
+ * Converts a UCX string to an immutable UCX string (scstr_t).
+ * @param str some UCX string
+ * @return the an immutable version of the provided string
+ */
+#define SCSTR(str) __builtin_choose_expr( \
+ __builtin_types_compatible_p(typeof(str), sstr_t), \
+ ucx_ss2sc, \
+ ucx_sc2sc)(str)
+
+#elif defined(__sun)
+
+/**
+ * Converts a UCX string to an immutable UCX string (scstr_t).
+ * @param str some UCX string
+ * @return the an immutable version of the provided string
+ */
+#define SCSTR(str) ({typeof(str) ucx_tmp_var_str = str; \
+ scstr_t ucx_tmp_var_c; \
+ ucx_tmp_var_c.ptr = ucx_tmp_var_str.ptr;\
+ ucx_tmp_var_c.length = ucx_tmp_var_str.length;\
+ ucx_tmp_var_c; })
+#else /* no generics and no builtins */
+
+/**
+ * Converts a UCX string to an immutable UCX string (scstr_t).
+ *
+ * This <b>internal</b> function (ab)uses the C standard an expects one single
+ * argument which is then implicitly converted to scstr_t without a warning.
+ *
+ * <b>Do not use this function manually.</b>
+ *
+ * @return the an immutable version of the provided string
+ */
+scstr_t ucx_ss2c_s();
+
+/**
+ * Converts a UCX string to an immutable UCX string (scstr_t).
+ * @param str some UCX string
+ * @return the an immutable version of the provided string
+ */
+#define SCSTR(str) ucx_ss2c_s(str)
+#endif /* C11 feature test */
+
+#endif /* C++ */
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/**
+ * Creates a new sstr_t based on a C string.
+ *
+ * The length is implicitly inferred by using a call to <code>strlen()</code>.
+ *
+ * <b>Note:</b> the sstr_t will hold a <i>reference</i> to the C string. If you
+ * do want a copy, use sstrdup() on the return value of this function.
+ *
+ * If you need to wrap a constant string, use scstr().
+ *
+ * @param cstring the C string to wrap
+ * @return a new sstr_t containing the C string
+ *
+ * @see sstrn()
+ */
+sstr_t sstr(char *cstring);
+
+/**
+ * Creates a new sstr_t of the specified length based on a C string.
+ *
+ * <b>Note:</b> the sstr_t will hold a <i>reference</i> to the C string. If you
+ * do want a copy, use sstrdup() on the return value of this function.
+ *
+ * If you need to wrap a constant string, use scstrn().
+ *
+ * @param cstring the C string to wrap
+ * @param length the length of the string
+ * @return a new sstr_t containing the C string
+ *
+ * @see sstr()
+ * @see S()
+ */
+sstr_t sstrn(char *cstring, size_t length);
+
+/**
+ * Creates a new scstr_t based on a constant C string.
+ *
+ * The length is implicitly inferred by using a call to <code>strlen()</code>.
+ *
+ * <b>Note:</b> the scstr_t will hold a <i>reference</i> to the C string. If you
+ * do want a copy, use scstrdup() on the return value of this function.
+ *
+ * @param cstring the C string to wrap
+ * @return a new scstr_t containing the C string
+ *
+ * @see scstrn()
+ */
+scstr_t scstr(const char *cstring);
+
+
+/**
+ * Creates a new scstr_t of the specified length based on a constant C string.
+ *
+ * <b>Note:</b> the scstr_t will hold a <i>reference</i> to the C string. If you
+ * do want a copy, use scstrdup() on the return value of this function.
+ *
+ *
+ * @param cstring the C string to wrap
+ * @param length the length of the string
+ * @return a new scstr_t containing the C string
+ *
+ * @see scstr()
+ */
+scstr_t scstrn(const char *cstring, size_t length);
+
+/**
+ * Returns the cumulated length of all specified strings.
+ *
+ * <b>Attention:</b> if the count argument does not match the count of the
+ * specified strings, the behavior is undefined.
+ *
+ * @param count the total number of specified strings (so at least 1)
+ * @param ... all strings
+ * @return the cumulated length of all strings
+ */
+size_t scstrnlen(size_t count, ...);
+
+/**
+ * Alias for scstrnlen() which automatically converts the arguments.
+ *
+ * @param count the total number of specified strings (so at least 1)
+ * @param ... all strings
+ * @return the cumulated length of all strings
+ */
+#define sstrnlen(count, ...) scstrnlen(count, __VA_ARGS__)
+
+/**
+ * Concatenates two or more strings.
+ *
+ * The resulting string will be allocated by standard <code>malloc()</code>.
+ * So developers <b>MUST</b> pass the sstr_t.ptr to <code>free()</code>.
+ *
+ * The sstr_t.ptr of the return value will <i>always</i> be <code>NULL</code>-
+ * terminated.
+ *
+ * @param count the total number of strings to concatenate
+ * @param s1 first string
+ * @param ... all remaining strings
+ * @return the concatenated string
+ */
+sstr_t scstrcat(size_t count, scstr_t s1, ...);
+
+/**
+ * Alias for scstrcat() which automatically converts the arguments.
+ *
+ * @param count the total number of strings to concatenate
+ * @param s1 first string
+ * @param ... all remaining strings
+ * @return the concatenated string
+ */
+#define sstrcat(count, s1, ...) scstrcat(count, SCSTR(s1), __VA_ARGS__)
+
+/**
+ * Concatenates two or more strings using a UcxAllocator.
+ *
+ * See scstrcat() for details.
+ *
+ * @param a the allocator to use
+ * @param count the total number of strings to concatenate
+ * @param s1 first string
+ * @param ... all remaining strings
+ * @return the concatenated string
+ */
+sstr_t scstrcat_a(UcxAllocator *a, size_t count, scstr_t s1, ...);
+
+/**
+ * Alias for scstrcat_a() which automatically converts the arguments.
+ *
+ * See sstrcat() for details.
+ *
+ * @param a the allocator to use
+ * @param count the total number of strings to concatenate
+ * @param s1 first string
+ * @param ... all remaining strings
+ * @return the concatenated string
+ */
+#define sstrcat_a(a, count, s1, ...) \
+ scstrcat_a(a, count, SCSTR(s1), __VA_ARGS__)
+
+/**
+ * Returns a substring starting at the specified location.
+ *
+ * <b>Attention:</b> the new string references the same memory area as the
+ * input string and will <b>NOT</b> be <code>NULL</code>-terminated.
+ * Use sstrdup() to get a copy.
+ *
+ * @param string input string
+ * @param start start location of the substring
+ * @return a substring of <code>string</code> starting at <code>start</code>
+ *
+ * @see sstrsubsl()
+ * @see sstrchr()
+ */
+sstr_t sstrsubs(sstr_t string, size_t start);
+
+/**
+ * Returns a substring with a maximum length starting at the specified location.
+ *
+ * <b>Attention:</b> the new string references the same memory area as the
+ * input string and will <b>NOT</b> be <code>NULL</code>-terminated.
+ * Use sstrdup() to get a copy.
+ *
+ * @param string input string
+ * @param start start location of the substring
+ * @param length the maximum length of the substring
+ * @return a substring of <code>string</code> starting at <code>start</code>
+ * with a maximum length of <code>length</code>
+ *
+ * @see sstrsubs()
+ * @see sstrchr()
+ */
+sstr_t sstrsubsl(sstr_t string, size_t start, size_t length);
+
+/**
+ * Returns a substring of an immutable string starting at the specified
+ * location.
+ *
+ * <b>Attention:</b> the new string references the same memory area as the
+ * input string and will <b>NOT</b> be <code>NULL</code>-terminated.
+ * Use scstrdup() to get a copy.
+ *
+ * @param string input string
+ * @param start start location of the substring
+ * @return a substring of <code>string</code> starting at <code>start</code>
+ *
+ * @see scstrsubsl()
+ * @see scstrchr()
+ */
+scstr_t scstrsubs(scstr_t string, size_t start);
+
+/**
+ * Returns a substring of an immutable string with a maximum length starting
+ * at the specified location.
+ *
+ * <b>Attention:</b> the new string references the same memory area as the
+ * input string and will <b>NOT</b> be <code>NULL</code>-terminated.
+ * Use scstrdup() to get a copy.
+ *
+ * @param string input string
+ * @param start start location of the substring
+ * @param length the maximum length of the substring
+ * @return a substring of <code>string</code> starting at <code>start</code>
+ * with a maximum length of <code>length</code>
+ *
+ * @see scstrsubs()
+ * @see scstrchr()
+ */
+scstr_t scstrsubsl(scstr_t string, size_t start, size_t length);
+
+/**
+ * Returns a substring starting at the location of the first occurrence of the
+ * specified character.
+ *
+ * If the string does not contain the character, an empty string is returned.
+ *
+ * @param string the string where to locate the character
+ * @param chr the character to locate
+ * @return a substring starting at the first location of <code>chr</code>
+ *
+ * @see sstrsubs()
+ */
+sstr_t sstrchr(sstr_t string, int chr);
+
+/**
+ * Returns a substring starting at the location of the last occurrence of the
+ * specified character.
+ *
+ * If the string does not contain the character, an empty string is returned.
+ *
+ * @param string the string where to locate the character
+ * @param chr the character to locate
+ * @return a substring starting at the last location of <code>chr</code>
+ *
+ * @see sstrsubs()
+ */
+sstr_t sstrrchr(sstr_t string, int chr);
+
+/**
+ * Returns an immutable substring starting at the location of the first
+ * occurrence of the specified character.
+ *
+ * If the string does not contain the character, an empty string is returned.
+ *
+ * @param string the string where to locate the character
+ * @param chr the character to locate
+ * @return a substring starting at the first location of <code>chr</code>
+ *
+ * @see scstrsubs()
+ */
+scstr_t scstrchr(scstr_t string, int chr);
+
+/**
+ * Returns an immutable substring starting at the location of the last
+ * occurrence of the specified character.
+ *
+ * If the string does not contain the character, an empty string is returned.
+ *
+ * @param string the string where to locate the character
+ * @param chr the character to locate
+ * @return a substring starting at the last location of <code>chr</code>
+ *
+ * @see scstrsubs()
+ */
+scstr_t scstrrchr(scstr_t string, int chr);
+
+/**
+ * Returns a substring starting at the location of the first occurrence of the
+ * specified string.
+ *
+ * If the string does not contain the other string, an empty string is returned.
+ *
+ * If <code>match</code> is an empty string, the complete <code>string</code> is
+ * returned.
+ *
+ * @param string the string to be scanned
+ * @param match string containing the sequence of characters to match
+ * @return a substring starting at the first occurrence of
+ * <code>match</code>, or an empty string, if the sequence is not
+ * present in <code>string</code>
+ */
+sstr_t scstrsstr(sstr_t string, scstr_t match);
+
+/**
+ * Alias for scstrsstr() which automatically converts the match string.
+ *
+ * @param string the string to be scanned
+ * @param match string containing the sequence of characters to match
+ * @return a substring starting at the first occurrence of
+ * <code>match</code>, or an empty string, if the sequence is not
+ * present in <code>string</code>
+ */
+#define sstrstr(string, match) scstrsstr(string, SCSTR(match))
+
+/**
+ * Returns an immutable substring starting at the location of the
+ * first occurrence of the specified immutable string.
+ *
+ * If the string does not contain the other string, an empty string is returned.
+ *
+ * If <code>match</code> is an empty string, the complete <code>string</code> is
+ * returned.
+ *
+ * @param string the string to be scanned
+ * @param match string containing the sequence of characters to match
+ * @return a substring starting at the first occurrence of
+ * <code>match</code>, or an empty string, if the sequence is not
+ * present in <code>string</code>
+ */
+scstr_t scstrscstr(scstr_t string, scstr_t match);
+
+/**
+ * Alias for scstrscstr() which automatically converts the match string.
+ *
+ * @param string the string to be scanned
+ * @param match string containing the sequence of characters to match
+ * @return a substring starting at the first occurrence of
+ * <code>match</code>, or an empty string, if the sequence is not
+ * present in <code>string</code>
+ */
+#define sstrscstr(string, match) scstrscstr(string, SCSTR(match))
+
+/**
+ * Splits a string into parts by using a delimiter string.
+ *
+ * This function will return <code>NULL</code>, if one of the following happens:
+ * <ul>
+ * <li>the string length is zero</li>
+ * <li>the delimeter length is zero</li>
+ * <li>the string equals the delimeter</li>
+ * <li>memory allocation fails</li>
+ * </ul>
+ *
+ * The integer referenced by <code>count</code> is used as input and determines
+ * the maximum size of the resulting array, i.e. the maximum count of splits to
+ * perform + 1.
+ *
+ * The integer referenced by <code>count</code> is also used as output and is
+ * set to
+ * <ul>
+ * <li>-2, on memory allocation errors</li>
+ * <li>-1, if either the string or the delimiter is an empty string</li>
+ * <li>0, if the string equals the delimiter</li>
+ * <li>1, if the string does not contain the delimiter</li>
+ * <li>the count of array items, otherwise</li>
+ * </ul>
+ *
+ * If the string starts with the delimiter, the first item of the resulting
+ * array will be an empty string.
+ *
+ * If the string ends with the delimiter and the maximum list size is not
+ * exceeded, the last array item will be an empty string.
+ * In case the list size would be exceeded, the last array item will be the
+ * remaining string after the last split, <i>including</i> the terminating
+ * delimiter.
+ *
+ * <b>Attention:</b> The array pointer <b>AND</b> all sstr_t.ptr of the array
+ * items must be manually passed to <code>free()</code>. Use sstrsplit_a() with
+ * an allocator to managed memory, to avoid this.
+ *
+ * @param string the string to split
+ * @param delim the delimiter string
+ * @param count IN: the maximum size of the resulting array (0 = no limit),
+ * OUT: the actual size of the array
+ * @return a sstr_t array containing the split strings or
+ * <code>NULL</code> on error
+ *
+ * @see scstrsplit_a()
+ */
+sstr_t* scstrsplit(scstr_t string, scstr_t delim, ssize_t *count);
+
+/**
+ * Alias for scstrsplit() which automatically converts the arguments.
+ *
+ * @param string the string to split
+ * @param delim the delimiter string
+ * @param count IN: the maximum size of the resulting array (0 = no limit),
+ * OUT: the actual size of the array
+ * @return a sstr_t array containing the split strings or
+ * <code>NULL</code> on error
+ *
+ * @see sstrsplit_a()
+ */
+#define sstrsplit(string, delim, count) \
+ scstrsplit(SCSTR(string), SCSTR(delim), count)
+
+/**
+ * Performing scstrsplit() using a UcxAllocator.
+ *
+ * <i>Read the description of scstrsplit() for details.</i>
+ *
+ * The memory for the sstr_t.ptr pointers of the array items and the memory for
+ * the sstr_t array itself are allocated by using the UcxAllocator.malloc()
+ * function.
+ *
+ * <b>Note:</b> the allocator is not used for memory that is freed within the
+ * same call of this function (locally scoped variables).
+ *
+ * @param allocator the UcxAllocator used for allocating memory
+ * @param string the string to split
+ * @param delim the delimiter string
+ * @param count IN: the maximum size of the resulting array (0 = no limit),
+ * OUT: the actual size of the array
+ * @return a sstr_t array containing the split strings or
+ * <code>NULL</code> on error
+ *
+ * @see scstrsplit()
+ */
+sstr_t* scstrsplit_a(UcxAllocator *allocator, scstr_t string, scstr_t delim,
+ ssize_t *count);
+
+/**
+ * Alias for scstrsplit_a() which automatically converts the arguments.
+ *
+ * @param allocator the UcxAllocator used for allocating memory
+ * @param string the string to split
+ * @param delim the delimiter string
+ * @param count IN: the maximum size of the resulting array (0 = no limit),
+ * OUT: the actual size of the array
+ * @return a sstr_t array containing the split strings or
+ * <code>NULL</code> on error
+ *
+ * @see sstrsplit()
+ */
+#define sstrsplit_a(allocator, string, delim, count) \
+ scstrsplit_a(allocator, SCSTR(string), SCSTR(delim), count)
+
+/**
+ * Compares two UCX strings with standard <code>memcmp()</code>.
+ *
+ * At first it compares the scstr_t.length attribute of the two strings. The
+ * <code>memcmp()</code> function is called, if and only if the lengths match.
+ *
+ * @param s1 the first string
+ * @param s2 the second string
+ * @return -1, if the length of s1 is less than the length of s2 or 1, if the
+ * length of s1 is greater than the length of s2 or the result of
+ * <code>memcmp()</code> otherwise (i.e. 0 if the strings match)
+ */
+int scstrcmp(scstr_t s1, scstr_t s2);
+
+/**
+ * Alias for scstrcmp() which automatically converts its arguments.
+ *
+ * @param s1 the first string
+ * @param s2 the second string
+ * @return -1, if the length of s1 is less than the length of s2 or 1, if the
+ * length of s1 is greater than the length of s2 or the result of
+ * <code>memcmp()</code> otherwise (i.e. 0 if the strings match)
+ */
+#define sstrcmp(s1, s2) scstrcmp(SCSTR(s1), SCSTR(s2))
+
+/**
+ * Compares two UCX strings ignoring the case.
+ *
+ * At first it compares the scstr_t.length attribute of the two strings. If and
+ * only if the lengths match, both strings are compared char by char ignoring
+ * the case.
+ *
+ * @param s1 the first string
+ * @param s2 the second string
+ * @return -1, if the length of s1 is less than the length of s2 or 1, if the
+ * length of s1 is greater than the length of s2 or the result of the platform
+ * specific string comparison function ignoring the case.
+ */
+int scstrcasecmp(scstr_t s1, scstr_t s2);
+
+/**
+ * Alias for scstrcasecmp() which automatically converts the arguments.
+ *
+ * @param s1 the first string
+ * @param s2 the second string
+ * @return -1, if the length of s1 is less than the length of s2 or 1, if the
+ * length of s1 is greater than the length of s2 or the result of the platform
+ * specific string comparison function ignoring the case.
+ */
+#define sstrcasecmp(s1, s2) scstrcasecmp(SCSTR(s1), SCSTR(s2))
+
+/**
+ * Creates a duplicate of the specified string.
+ *
+ * The new sstr_t will contain a copy allocated by standard
+ * <code>malloc()</code>. So developers <b>MUST</b> pass the sstr_t.ptr to
+ * <code>free()</code>.
+ *
+ * The sstr_t.ptr of the return value will <i>always</i> be <code>NULL</code>-
+ * terminated and mutable, regardless of the argument.
+ *
+ * @param string the string to duplicate
+ * @return a duplicate of the string
+ * @see scstrdup_a()
+ */
+sstr_t scstrdup(scstr_t string);
+
+/**
+ * Alias for scstrdup() which automatically converts the argument.
+ *
+ * @param string the string to duplicate
+ * @return a duplicate of the string
+ * @see sstrdup_a()
+ */
+#define sstrdup(string) scstrdup(SCSTR(string))
+
+/**
+ * Creates a duplicate of the specified string using a UcxAllocator.
+ *
+ * The new sstr_t will contain a copy allocated by the allocators
+ * UcxAllocator.malloc() function. So it is implementation depended, whether the
+ * returned sstr_t.ptr pointer must be passed to the allocators
+ * UcxAllocator.free() function manually.
+ *
+ * The sstr_t.ptr of the return value will <i>always</i> be <code>NULL</code>-
+ * terminated and mutable, regardless of the argument.
+ *
+ * @param allocator a valid instance of a UcxAllocator
+ * @param string the string to duplicate
+ * @return a duplicate of the string
+ * @see scstrdup()
+ */
+sstr_t scstrdup_a(UcxAllocator *allocator, scstr_t string);
+
+/**
+ * Alias for scstrdup_a() which automatically converts the argument.
+ *
+ * @param allocator a valid instance of a UcxAllocator
+ * @param string the string to duplicate
+ * @return a duplicate of the string
+ * @see scstrdup()
+ */
+#define sstrdup_a(allocator, string) scstrdup_a(allocator, SCSTR(string))
+
+
+/**
+ * Omits leading and trailing spaces.
+ *
+ * This function returns a new sstr_t containing a trimmed version of the
+ * specified string.
+ *
+ * <b>Note:</b> the new sstr_t references the same memory, thus you
+ * <b>MUST NOT</b> pass the sstr_t.ptr of the return value to
+ * <code>free()</code>. It is also highly recommended to avoid assignments like
+ * <code>mystr = sstrtrim(mystr);</code> as you lose the reference to the
+ * source string. Assignments of this type are only permitted, if the
+ * sstr_t.ptr of the source string does not need to be freed or if another
+ * reference to the source string exists.
+ *
+ * @param string the string that shall be trimmed
+ * @return a new sstr_t containing the trimmed string
+ */
+sstr_t sstrtrim(sstr_t string);
+
+/**
+ * Omits leading and trailing spaces.
+ *
+ * This function returns a new scstr_t containing a trimmed version of the
+ * specified string.
+ *
+ * <b>Note:</b> the new scstr_t references the same memory, thus you
+ * <b>MUST NOT</b> pass the scstr_t.ptr of the return value to
+ * <code>free()</code>. It is also highly recommended to avoid assignments like
+ * <code>mystr = scstrtrim(mystr);</code> as you lose the reference to the
+ * source string. Assignments of this type are only permitted, if the
+ * scstr_t.ptr of the source string does not need to be freed or if another
+ * reference to the source string exists.
+ *
+ * @param string the string that shall be trimmed
+ * @return a new scstr_t containing the trimmed string
+ */
+scstr_t scstrtrim(scstr_t string);
+
+/**
+ * Checks, if a string has a specific prefix.
+ * @param string the string to check
+ * @param prefix the prefix the string should have
+ * @return 1, if and only if the string has the specified prefix, 0 otherwise
+ */
+int scstrprefix(scstr_t string, scstr_t prefix);
+
+/**
+ * Alias for scstrprefix() which automatically converts the arguments.
+ *
+ * @param string the string to check
+ * @param prefix the prefix the string should have
+ * @return 1, if and only if the string has the specified prefix, 0 otherwise
+ */
+#define sstrprefix(string, prefix) scstrprefix(SCSTR(string), SCSTR(prefix))
+
+/**
+ * Checks, if a string has a specific suffix.
+ * @param string the string to check
+ * @param suffix the suffix the string should have
+ * @return 1, if and only if the string has the specified suffix, 0 otherwise
+ */
+int scstrsuffix(scstr_t string, scstr_t suffix);
+
+/**
+ * Alias for scstrsuffix() which automatically converts the arguments.
+ *
+ * @param string the string to check
+ * @param suffix the suffix the string should have
+ * @return 1, if and only if the string has the specified suffix, 0 otherwise
+ */
+#define sstrsuffix(string, suffix) scstrsuffix(SCSTR(string), SCSTR(suffix))
+
+/**
+ * Returns a lower case version of a string.
+ *
+ * This function creates a duplicate of the input string, first. See the
+ * documentation of scstrdup() for the implications.
+ *
+ * @param string the input string
+ * @return the resulting lower case string
+ * @see scstrdup()
+ */
+sstr_t scstrlower(scstr_t string);
+
+/**
+ * Alias for scstrlower() which automatically converts the argument.
+ *
+ * @param string the input string
+ * @return the resulting lower case string
+ */
+#define sstrlower(string) scstrlower(SCSTR(string))
+
+/**
+ * Returns a lower case version of a string.
+ *
+ * This function creates a duplicate of the input string, first. See the
+ * documentation of scstrdup_a() for the implications.
+ *
+ * @param allocator the allocator used for duplicating the string
+ * @param string the input string
+ * @return the resulting lower case string
+ * @see scstrdup_a()
+ */
+sstr_t scstrlower_a(UcxAllocator *allocator, scstr_t string);
+
+
+/**
+ * Alias for scstrlower_a() which automatically converts the argument.
+ *
+ * @param allocator the allocator used for duplicating the string
+ * @param string the input string
+ * @return the resulting lower case string
+ */
+#define sstrlower_a(allocator, string) scstrlower_a(allocator, SCSTR(string))
+
+/**
+ * Returns a upper case version of a string.
+ *
+ * This function creates a duplicate of the input string, first. See the
+ * documentation of scstrdup() for the implications.
+ *
+ * @param string the input string
+ * @return the resulting upper case string
+ * @see scstrdup()
+ */
+sstr_t scstrupper(scstr_t string);
+
+/**
+ * Alias for scstrupper() which automatically converts the argument.
+ *
+ * @param string the input string
+ * @return the resulting upper case string
+ */
+#define sstrupper(string) scstrupper(SCSTR(string))
+
+/**
+ * Returns a upper case version of a string.
+ *
+ * This function creates a duplicate of the input string, first. See the
+ * documentation of scstrdup_a() for the implications.
+ *
+ * @param allocator the allocator used for duplicating the string
+ * @param string the input string
+ * @return the resulting upper case string
+ * @see scstrdup_a()
+ */
+sstr_t scstrupper_a(UcxAllocator *allocator, scstr_t string);
+
+/**
+ * Alias for scstrupper_a() which automatically converts the argument.
+ *
+ * @param allocator the allocator used for duplicating the string
+ * @param string the input string
+ * @return the resulting upper case string
+ */
+#define sstrupper_a(allocator, string) scstrupper_a(allocator, string)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* UCX_STRING_H */