ucx: ucx/string.h@baa839a7633f (annotated)

ucx/string.h@baa839a7633f (annotated)

ucx/string.h

Fri, 19 Jul 2013 14:17:12 +0200

author: Mike Becker <universe@uap-core.de>
date: Fri, 19 Jul 2013 14:17:12 +0200
changeset 119: baa839a7633f
parent 118: 151f5345f303
child 123: 7fb0f74517c5
permissions: -rw-r--r--

completed documentation on sstr_t + sstrsplit overhaul + allocator version of sstrsplit

 /*
  * 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 strings.
  *
  * At least one string must be specified and there must be enough memory
  * available referenced by the destination sstr_t.ptr for this function to
  * successfully concatenate all specified strings.
  *
  * The sstr_t.length of the destination string specifies the capacity and
  * should match the total memory available referenced by the destination
  * sstr_t.ptr. This function <i>never</i> copies data beyond the capacity and
  * does not modify any of the source strings.
  *
  * <b>Attention:</b>
  * <ul>
  *   <li>Any content in the destination string will be overwritten</li>
  *   <li>The destination sstr_t.ptr is <b>NOT</b>
  *       <code>NULL</code>-terminated</li>
  *   <li>The destination sstr_t.length is set to the total length of the
  *       concatenated strings</li>
  *   <li><i>Hint:</i> get a <code>NULL</code>-terminated string by performing
  *       <code>mystring.ptr[mystring.length]='\0'</code> after calling this
  *       function</li>
  * </ul>
   *
  * @param count   the total number of strings to concatenate
  * @param dest    new sstr_t with capacity information and allocated memory
  * @param src     the first string
  * @param ...     all other strings
  * @return the argument for <code>dest</code> is returned
  */
 sstr_t sstrncat(size_t count, sstr_t dest, sstr_t src, ...);
 /**
  * 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 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 least location of <code>chr</code>
  *
  * @see sstrsubs()
  */
 sstr_t sstrchr(sstr_t string, int chr);
 /**
  * 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 list, 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 list items, otherwise</li>
  * </ul>
  *
  * If the string starts with the delimiter, the first item of the resulting
  * list will be an empty string.
  *
  * If the string ends with the delimiter and the maximum list size is not
  * exceeded, the last list item will be an empty string.
  *
  * <b>Attention:</b> All list items <b>AND</b> all sstr_t.ptr of the list
  * items must be manually passed to <code>free()</code>. Use sstrsplita() 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 list (0 for an
  *               unbounded list), OUT: the actual size of the list
  * @return a list of the split strings as sstr_t array or
  *         <code>NULL</code> on error
  *
  * @see sstrsplita()
  */
 sstr_t* sstrsplit(sstr_t string, sstr_t delim, size_t *count);
 /**
  * Performing sstrsplit() using an UcxAllocator.
  *
  * <i>Read the description of sstrsplit() for details.</i>
  *
  * The memory for the sstr_t.ptr pointers of the list 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 string the string to split
  * @param delim  the delimiter string
  * @param count  IN: the maximum size of the resulting list (0 for an
  *               unbounded list), OUT: the actual size of the list
  * @param allocator the UcxAllocator used for allocating memory
  * @return a list of the split strings as sstr_t array or
  *         <code>NULL</code> on error
  *
  * @see sstrsplit()
  */
 sstr_t* sstrsplita(sstr_t string, sstr_t delim, size_t *count,
         UcxAllocator *allocator);
 /**
  * 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
  * @see sstrdupa()
  */
 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
  * @see sstrdup()
  */
 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@baa839a7633f (annotated)

ucx/string.h