ucx: ucx/string.h@151f5345f303 (annotated)

ucx/string.h@151f5345f303 (annotated)

ucx/string.h

Wed, 17 Jul 2013 20:03:01 +0200

author: Mike Becker <universe@uap-core.de>
date: Wed, 17 Jul 2013 20:03:01 +0200
changeset 118: 151f5345f303
parent 116: 234920008754
child 119: baa839a7633f
permissions: -rw-r--r--

documented allocator + some further documentation for sstr_t

 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
  *
  * Copyright 2013 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>
 /** Shortcut for a <code>sstr_t struct</code> literal. */
 #define ST(s) { (char*)s, sizeof(s)-1 }
 /** Shortcut for the conversion of a C string to a <code>sstr_t</code>. */
 #define S(s) sstrn((char*)s, sizeof(s)-1)
 #ifdef	__cplusplus
 extern "C" {
 #endif
 /**
  * The UCX string structure.
  */
 typedef struct {
    /** A reference to the string (<b>not necessarily  <code>NULL</code>
     * -terminated</b>) */
     char   *ptr;
     /** The length of the string */
     size_t length;
 } sstr_t;
 /**
  * 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.
  *
  * @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.
  *
  * @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);
 /**
  * Returns the cumulated length of all specified strings.
  *
  * At least one string must be specified.
  *
  * <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 string   the first string
  * @param ...      all other strings
  * @return the cumulated length of all strings
  */
 size_t sstrnlen(size_t count, sstr_t string, ...);
 /*
  * concatenates n strings
  *
  * n    number of strings
  * s    new string with enough memory allocated
  * ...  strings
  */
 sstr_t sstrncat(size_t n, sstr_t s, sstr_t c1, ...);
 /*
  *
  */
 sstr_t sstrsubs(sstr_t s, size_t start);
 /*
  *
  */
 sstr_t sstrsubsl(sstr_t s, size_t start, size_t length);
 /*
  *
  */
 sstr_t sstrchr(sstr_t s, int c);
 /*
  * splits s into n parts
  *
  * s    the string to split
  * d    the delimiter string
  * n    the maximum size of the resulting list
  *      a size of 0 indicates an unbounded list size
  *      the actual size of the list will be stored here
  *
  *      Hint: use this value to avoid dynamic reallocation of the result list
  *
  * Returns a list of the split strings
  * NOTE: this list needs to be freed manually after usage
  *
  * Returns NULL on error
  */
 sstr_t* sstrsplit(sstr_t s, sstr_t d, size_t *n);
 /**
  * Compares two UCX strings with standard <code>memcmp()</code>.
  *
  * At first it compares the sstr_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 sstrcmp(sstr_t s1, sstr_t 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.
  *
  * @param string the string to duplicate
  * @return a duplicate of the string
  */
 sstr_t sstrdup(sstr_t string);
 /**
  * Creates a duplicate of the specified string using an UcxAllocator.
  *
  * The new sstr_t will contain a copy allocated by the allocators
  * ucx_allocator_malloc function. So it is implementation depended, whether the
  * returned sstr_t.ptr pointer must be passed to the allocators
  * ucx_allocator_free function manually.
  *
  * The sstr_t.ptr of the return value will <i>always</i> be <code>NULL</code>-
  * terminated.
  *
  * @param allocator a valid instance of an UcxAllocator
  * @param string the string to duplicate
  * @return a duplicate of the string
  */
 sstr_t sstrdupa(UcxAllocator *allocator, sstr_t 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);
 #ifdef	__cplusplus
 }
 #endif
 #endif	/* UCX_STRING_H */

Mercurial > hg > ucx / annotate

ucx/string.h@151f5345f303 (annotated)

ucx/string.h