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triostr.c

/*************************************************************************
 *
 * $Id: triostr.c,v 1.30 2005/11/26 14:47:54 breese Exp $
 *
 * Copyright (C) 2001 Bjorn Reese and Daniel Stenberg.
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
 * MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE AUTHORS AND
 * CONTRIBUTORS ACCEPT NO RESPONSIBILITY IN ANY CONCEIVABLE MANNER.
 *
 ************************************************************************/

/*************************************************************************
 * Include files
 */

#if defined(HAVE_CONFIG_H)
# include <config.h>
#endif
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include "triodef.h"
#include "triostr.h"
#if defined(TRIO_FUNC_TO_LONG_DOUBLE)
# define USE_MATH
#endif
#if defined(USE_MATH)
# include <math.h>
#endif

/*************************************************************************
 * Definitions
 */

#if !defined(TRIO_PUBLIC_STRING)
# define TRIO_PUBLIC_STRING TRIO_PUBLIC
#endif
#if !defined(TRIO_PRIVATE_STRING)
# define TRIO_PRIVATE_STRING TRIO_PRIVATE
#endif

#if !defined(NULL)
# define NULL 0
#endif
#if !defined(NIL)
# define NIL ((char)0)
#endif
#if !defined(FALSE)
# define FALSE (1 == 0)
# define TRUE (! FALSE)
#endif
#if !defined(BOOLEAN_T)
# define BOOLEAN_T int
#endif

#if defined(USE_MATH)
# if defined(PREDEF_STANDARD_C99)
#  if defined(TRIO_COMPILER_DECC)
#   if (TRIO_COMPILER_DECC - 0 > 80000000)
/*
 * The OSF/1 runtime that comes with the DECC compiler does not support
 * hexfloats conversion.
 */
#    define USE_STRTOD
#    define USE_STRTOF
#   endif
#  else
#   define USE_STRTOD
#   define USE_STRTOF
#  endif
# else
#  if defined(TRIO_COMPILER_VISUALC)
#   define USE_STRTOD
#  endif
#endif
#endif

#if defined(TRIO_PLATFORM_UNIX)
# if defined(PREDEF_STANDARD_UNIX95)
#  define USE_STRCASECMP
#  define USE_STRNCASECMP
# endif
# if defined(TRIO_PLATFORM_SUNOS)
#  define USE_SYS_ERRLIST
# else
#  define USE_STRERROR
# endif
# if defined(TRIO_PLATFORM_QNX)
#  define strcasecmp(x,y) stricmp(x,y)
#  define strncasecmp(x,y,n) strnicmp(x,y,n)
# endif
#endif

#if defined(TRIO_PLATFORM_WIN32)
# define USE_STRCASECMP
# define strcasecmp(x,y) strcmpi(x,y)
#endif

#if !(defined(TRIO_PLATFORM_SUNOS))
# define USE_TOLOWER
# define USE_TOUPPER
#endif

#if defined(USE_MATH)
# if !defined(HAVE_POWL)
#  if defined(PREDEF_STANDARD_C99) \
   || defined(PREDEF_STANDARD_UNIX03)
#   define HAVE_POWL
#  else
#   if defined(TRIO_COMPILER_VISUALC)
#    if defined(powl)
#     define HAVE_POWL
#    endif
#   endif
#  endif
# endif
#endif

#if defined(HAVE_POWL)
# define trio_powl(x,y) powl((x),(y))
#else
# define trio_powl(x,y) pow((double)(x),(double)(y))
#endif

#if defined(TRIO_FUNC_TO_UPPER) \
 || (defined(TRIO_FUNC_EQUAL) && !defined(USE_STRCASECMP)) \
 || (defined(TRIO_FUNC_EQUAL_MAX) && !defined(USE_STRNCASECMP)) \
 || defined(TRIO_FUNC_MATCH) \
 || defined(TRIO_FUNC_TO_LONG_DOUBLE) \
 || defined(TRIO_FUNC_UPPER)
# define TRIO_FUNC_INTERNAL_TO_UPPER
#endif

/*************************************************************************
 * Structures
 */

00145 struct _trio_string_t
{
  char *content;
  size_t length;
  size_t allocated;
};

/*************************************************************************
 * Constants
 */

#if !defined(TRIO_EMBED_STRING)
static TRIO_CONST char rcsid[] = "@(#)$Id: triostr.c,v 1.30 2005/11/26 14:47:54 breese Exp $";
#endif

/*************************************************************************
 * Static String Functions
 */

#if defined(TRIO_DOCUMENTATION)
# include "doc/doc_static.h"
#endif
/** @addtogroup StaticStrings
    @{
*/

/*
 * internal_duplicate_max
 */
#if defined(TRIO_FUNC_DUPLICATE) \
 || defined(TRIO_FUNC_DUPLICATE_MAX) \
 || defined(TRIO_FUNC_STRING_DUPLICATE) \
 || defined(TRIO_FUNC_XSTRING_DUPLICATE)

TRIO_PRIVATE_STRING char *
internal_duplicate_max
TRIO_ARGS2((source, size),
         TRIO_CONST char *source,
         size_t size)
{
  char *target;

  assert(source);

  /* Make room for string plus a terminating zero */
  size++;
  target = trio_create(size);
  if (target)
    {
      trio_copy_max(target, size, source);
    }
  return target;
}

#endif

/*
 * internal_string_alloc
 */
#if defined(TRIO_FUNC_STRING_CREATE) \
 || defined(TRIO_FUNC_STRING_DUPLICATE) \
 || defined(TRIO_FUNC_XSTRING_DUPLICATE)

TRIO_PRIVATE_STRING trio_string_t *
internal_string_alloc(TRIO_NOARGS)
{
  trio_string_t *self;
  
  self = (trio_string_t *)TRIO_MALLOC(sizeof(trio_string_t));
  if (self)
    {
      self->content = NULL;
      self->length = 0;
      self->allocated = 0;
    }
  return self;
}

#endif

/*
 * internal_string_grow
 *
 * The size of the string will be increased by 'delta' characters. If
 * 'delta' is zero, the size will be doubled.
 */
#if defined(TRIO_FUNC_STRING_CREATE) \
 || defined(TRIO_FUNC_STRING_APPEND) \
 || defined(TRIO_FUNC_XSTRING_APPEND) \
 || defined(TRIO_FUNC_XSTRING_APPEND_CHAR)

TRIO_PRIVATE_STRING BOOLEAN_T
internal_string_grow
TRIO_ARGS2((self, delta),
         trio_string_t *self,
         size_t delta)
{
  BOOLEAN_T status = FALSE;
  char *new_content;
  size_t new_size;

  new_size = (delta == 0)
    ? ( (self->allocated == 0) ? 1 : self->allocated * 2 )
    : self->allocated + delta;
  
  new_content = (char *)TRIO_REALLOC(self->content, new_size);
  if (new_content)
    {
      self->content = new_content;
      self->allocated = new_size;
      status = TRUE;
    }
  return status;
}

#endif

/*
 * internal_string_grow_to
 *
 * The size of the string will be increased to 'length' plus one characters.
 * If 'length' is less than the original size, the original size will be
 * used (that is, the size of the string is never decreased).
 */
#if defined(TRIO_FUNC_STRING_APPEND) \
 || defined(TRIO_FUNC_XSTRING_APPEND)

TRIO_PRIVATE_STRING BOOLEAN_T
internal_string_grow_to
TRIO_ARGS2((self, length),
         trio_string_t *self,
         size_t length)
{
  length++; /* Room for terminating zero */
  return (self->allocated < length)
    ? internal_string_grow(self, length - self->allocated)
    : TRUE;
}

#endif

#if defined(TRIO_FUNC_INTERNAL_TO_UPPER)

TRIO_PRIVATE_STRING TRIO_INLINE int
internal_to_upper
TRIO_ARGS1((source),
         int source)
{
# if defined(USE_TOUPPER)
  
  return toupper(source);
  
# else

  /* Does not handle locales or non-contiguous alphabetic characters */
  return ((source >= (int)'a') && (source <= (int)'z'))
    ? source - 'a' + 'A'
    : source;
  
# endif
}

#endif


/**
   Create new string.

   @param size Size of new string.
   @return Pointer to string, or NULL if allocation failed.
*/
#if defined(TRIO_FUNC_CREATE)

TRIO_PUBLIC_STRING char *
trio_create
TRIO_ARGS1((size),
         size_t size)
{
  return (char *)TRIO_MALLOC(size);
}

#endif

/**
   Destroy string.

   @param string String to be freed.
*/
#if defined(TRIO_FUNC_DESTROY)

TRIO_PUBLIC_STRING void
trio_destroy
TRIO_ARGS1((string),
         char *string)
{
  if (string)
    {
      TRIO_FREE(string);
    }
}

#endif

/**
   Count the number of characters in a string.

   @param string String to measure.
   @return Number of characters in @p string.
*/
#if defined(TRIO_FUNC_LENGTH)

TRIO_PUBLIC_STRING size_t
trio_length
TRIO_ARGS1((string),
         TRIO_CONST char *string)
{
  return strlen(string);
}

#endif

/**
   Append @p source at the end of @p target.
   
   @param target Target string.
   @param source Source string.
   @return Boolean value indicating success or failure.
   
   @pre @p target must point to a memory chunk with sufficient room to
   contain the @p target string and @p source string.
   @pre No boundary checking is performed, so insufficient memory will
   result in a buffer overrun.
   @post @p target will be zero terminated.
*/
#if defined(TRIO_FUNC_APPEND)

TRIO_PUBLIC_STRING int
trio_append
TRIO_ARGS2((target, source),
         char *target,
         TRIO_CONST char *source)
{
  assert(target);
  assert(source);
  
  return (strcat(target, source) != NULL);
}

#endif

/**
   Append at most @p max characters from @p source to @p target.
   
   @param target Target string.
   @param max Maximum number of characters to append.
   @param source Source string.
   @return Boolean value indicating success or failure.
   
   @pre @p target must point to a memory chuck with sufficient room to
   contain the @p target string and the @p source string (at most @p max
   characters).
   @pre No boundary checking is performed, so insufficient memory will
   result in a buffer overrun.
   @post @p target will be zero terminated.
*/
#if defined(TRIO_FUNC_APPEND_MAX)

TRIO_PUBLIC_STRING int
trio_append_max
TRIO_ARGS3((target, max, source),
         char *target,
         size_t max,
         TRIO_CONST char *source)
{
  size_t length;
  
  assert(target);
  assert(source);

  length = trio_length(target);
  
  if (max > length)
    {
      strncat(target, source, max - length - 1);
    }
  return TRUE;
}

#endif

/**
   Determine if a string contains a substring.

   @param string String to be searched.
   @param substring String to be found.
   @return Boolean value indicating success or failure.
*/
#if defined(TRIO_FUNC_CONTAINS)

TRIO_PUBLIC_STRING int
trio_contains
TRIO_ARGS2((string, substring),
         TRIO_CONST char *string,
         TRIO_CONST char *substring)
{
  assert(string);
  assert(substring);
  
  return (0 != strstr(string, substring));
}

#endif

/**
   Copy @p source to @p target.
   
   @param target Target string.
   @param source Source string.
   @return Boolean value indicating success or failure.
   
   @pre @p target must point to a memory chunk with sufficient room to
   contain the @p source string.
   @pre No boundary checking is performed, so insufficient memory will
   result in a buffer overrun.
   @post @p target will be zero terminated.
*/
#if defined(TRIO_FUNC_COPY)

TRIO_PUBLIC_STRING int
trio_copy
TRIO_ARGS2((target, source),
         char *target,
         TRIO_CONST char *source)
{
  assert(target);
  assert(source);
     
  (void)strcpy(target, source);
  return TRUE;
}

#endif

/**
   Copy at most @p max characters from @p source to @p target.
   
   @param target Target string.
   @param max Maximum number of characters to append.
   @param source Source string.
   @return Boolean value indicating success or failure.
   
   @pre @p target must point to a memory chunk with sufficient room to
   contain the @p source string (at most @p max characters).
   @pre No boundary checking is performed, so insufficient memory will
   result in a buffer overrun.
   @post @p target will be zero terminated.
*/
#if defined(TRIO_FUNC_COPY_MAX)

TRIO_PUBLIC_STRING int
trio_copy_max
TRIO_ARGS3((target, max, source),
         char *target,
         size_t max,
         TRIO_CONST char *source)
{
  assert(target);
  assert(source);
  assert(max > 0); /* Includes != 0 */

  (void)strncpy(target, source, max - 1);
  target[max - 1] = (char)0;
  return TRUE;
}

#endif

/**
   Duplicate @p source.
   
   @param source Source string.
   @return A copy of the @p source string.
   
   @post @p target will be zero terminated.
*/
#if defined(TRIO_FUNC_DUPLICATE)

TRIO_PUBLIC_STRING char *
trio_duplicate
TRIO_ARGS1((source),
         TRIO_CONST char *source)
{
  return internal_duplicate_max(source, trio_length(source));
}

#endif

/**
   Duplicate at most @p max characters of @p source.
   
   @param source Source string.
   @param max Maximum number of characters to duplicate.
   @return A copy of the @p source string.
   
   @post @p target will be zero terminated.
*/
#if defined(TRIO_FUNC_DUPLICATE_MAX)

TRIO_PUBLIC_STRING char *
trio_duplicate_max
TRIO_ARGS2((source, max),
         TRIO_CONST char *source,
         size_t max)
{
  size_t length;

  assert(source);
  assert(max > 0);

  length = trio_length(source);
  if (length > max)
    {
      length = max;
    }
  return internal_duplicate_max(source, length);
}

#endif

/**
   Compare if two strings are equal.
   
   @param first First string.
   @param second Second string.
   @return Boolean indicating whether the two strings are equal or not.
   
   Case-insensitive comparison.
*/
#if defined(TRIO_FUNC_EQUAL)

TRIO_PUBLIC_STRING int
trio_equal
TRIO_ARGS2((first, second),
         TRIO_CONST char *first,
         TRIO_CONST char *second)
{
  assert(first);
  assert(second);

  if ((first != NULL) && (second != NULL))
    {
# if defined(USE_STRCASECMP)
      return (0 == strcasecmp(first, second));
# else
      while ((*first != NIL) && (*second != NIL))
      {
        if (internal_to_upper(*first) != internal_to_upper(*second))
          {
            break;
          }
        first++;
        second++;
      }
      return ((*first == NIL) && (*second == NIL));
# endif
    }
  return FALSE;
}

#endif

/**
   Compare if two strings are equal.
   
   @param first First string.
   @param second Second string.
   @return Boolean indicating whether the two strings are equal or not.
   
   Case-sensitive comparison.
*/
#if defined(TRIO_FUNC_EQUAL_CASE)

TRIO_PUBLIC_STRING int
trio_equal_case
TRIO_ARGS2((first, second),
         TRIO_CONST char *first,
         TRIO_CONST char *second)
{
  assert(first);
  assert(second);

  if ((first != NULL) && (second != NULL))
    {
      return (0 == strcmp(first, second));
    }
  return FALSE;
}

#endif

/**
   Compare if two strings up until the first @p max characters are equal.
   
   @param first First string.
   @param max Maximum number of characters to compare.
   @param second Second string.
   @return Boolean indicating whether the two strings are equal or not.
   
   Case-sensitive comparison.
*/
#if defined(TRIO_FUNC_EQUAL_CASE_MAX)

TRIO_PUBLIC_STRING int
trio_equal_case_max
TRIO_ARGS3((first, max, second),
         TRIO_CONST char *first,
         size_t max,
         TRIO_CONST char *second)
{
  assert(first);
  assert(second);

  if ((first != NULL) && (second != NULL))
    {
      return (0 == strncmp(first, second, max));
    }
  return FALSE;
}

#endif

/**
   Compare if two strings are equal.
   
   @param first First string.
   @param second Second string.
   @return Boolean indicating whether the two strings are equal or not.

   Collating characters are considered equal.
*/
#if defined(TRIO_FUNC_EQUAL_LOCALE)

TRIO_PUBLIC_STRING int
trio_equal_locale
TRIO_ARGS2((first, second),
         TRIO_CONST char *first,
         TRIO_CONST char *second)
{
  assert(first);
  assert(second);

# if defined(LC_COLLATE)
  return (strcoll(first, second) == 0);
# else
  return trio_equal(first, second);
# endif
}

#endif

/**
   Compare if two strings up until the first @p max characters are equal.
   
   @param first First string.
   @param max Maximum number of characters to compare.
   @param second Second string.
   @return Boolean indicating whether the two strings are equal or not.
   
   Case-insensitive comparison.
*/
#if defined(TRIO_FUNC_EQUAL_MAX)

TRIO_PUBLIC_STRING int
trio_equal_max
TRIO_ARGS3((first, max, second),
         TRIO_CONST char *first,
         size_t max,
         TRIO_CONST char *second)
{
  assert(first);
  assert(second);

  if ((first != NULL) && (second != NULL))
    {
# if defined(USE_STRNCASECMP)
      return (0 == strncasecmp(first, second, max));
# else
      /* Not adequately tested yet */
      size_t cnt = 0;
      while ((*first != NIL) && (*second != NIL) && (cnt <= max))
      {
        if (internal_to_upper(*first) != internal_to_upper(*second))
          {
            break;
          }
        first++;
        second++;
        cnt++;
      }
      return ((cnt == max) || ((*first == NIL) && (*second == NIL)));
# endif
    }
  return FALSE;
}

#endif

/**
   Provide a textual description of an error code (errno).

   @param error_number Error number.
   @return Textual description of @p error_number.
*/
#if defined(TRIO_FUNC_ERROR)

TRIO_PUBLIC_STRING TRIO_CONST char *
trio_error
TRIO_ARGS1((error_number),
         int error_number)
{
# if defined(USE_STRERROR)
  
  return strerror(error_number);

# else
#  if defined(USE_SYS_ERRLIST)

  extern char *sys_errlist[];
  extern int sys_nerr;

  return ((error_number < 0) || (error_number >= sys_nerr))
    ? "unknown"
    : sys_errlist[error_number];
 
#  else
  
  return "unknown";

#  endif
# endif
}

#endif

/**
   Format the date/time according to @p format.

   @param target Target string.
   @param max Maximum number of characters to format.
   @param format Formatting string.
   @param datetime Date/time structure.
   @return Number of formatted characters.

   The formatting string accepts the same specifiers as the standard C
   function strftime.
*/
#if defined(TRIO_FUNC_FORMAT_DATE_MAX)

TRIO_PUBLIC_STRING size_t
trio_format_date_max
TRIO_ARGS4((target, max, format, datetime),
         char *target,
         size_t max,
         TRIO_CONST char *format,
         TRIO_CONST struct tm *datetime)
{
  assert(target);
  assert(format);
  assert(datetime);
  assert(max > 0);
  
  return strftime(target, max, format, datetime);
}

#endif

/**
   Calculate a hash value for a string.

   @param string String to be calculated on.
   @param type Hash function.
   @return Calculated hash value.

   @p type can be one of the following
   @li @c TRIO_HASH_PLAIN Plain hash function.
*/
#if defined(TRIO_FUNC_HASH)

TRIO_PUBLIC_STRING unsigned long
trio_hash
TRIO_ARGS2((string, type),
         TRIO_CONST char *string,
         int type)
{
  unsigned long value = 0L;
  char ch;

  assert(string);
  
  switch (type)
    {
    case TRIO_HASH_PLAIN:
      while ( (ch = *string++) != NIL )
      {
        value *= 31;
        value += (unsigned long)ch;
      }
      break;
    default:
      assert(FALSE);
      break;
    }
  return value;
}

#endif

/**
   Find first occurrence of a character in a string.

   @param string String to be searched.
   @param character Character to be found.
   @return A pointer to the found character, or NULL if character was not found.
 */
#if defined(TRIO_FUNC_INDEX)

TRIO_PUBLIC_STRING char *
trio_index
TRIO_ARGS2((string, character),
         TRIO_CONST char *string,
         int character)
{
  assert(string);

  return strchr(string, character);
}

#endif

/**
   Find last occurrence of a character in a string.

   @param string String to be searched.
   @param character Character to be found.
   @return A pointer to the found character, or NULL if character was not found.
 */
#if defined(TRIO_FUNC_INDEX_LAST)

TRIO_PUBLIC_STRING char *
trio_index_last
TRIO_ARGS2((string, character),
         TRIO_CONST char *string,
         int character)
{
  assert(string);

  return strchr(string, character);
}

#endif

/**
   Convert the alphabetic letters in the string to lower-case.

   @param target String to be converted.
   @return Number of processed characters (converted or not).
*/
#if defined(TRIO_FUNC_LOWER)

TRIO_PUBLIC_STRING int
trio_lower
TRIO_ARGS1((target),
         char *target)
{
  assert(target);

  return trio_span_function(target, target, trio_to_lower);
}

#endif

/**
   Compare two strings using wildcards.

   @param string String to be searched.
   @param pattern Pattern, including wildcards, to search for.
   @return Boolean value indicating success or failure.

   Case-insensitive comparison.
   
   The following wildcards can be used
   @li @c * Match any number of characters.
   @li @c ? Match a single character.
*/
#if defined(TRIO_FUNC_MATCH)

TRIO_PUBLIC_STRING int
trio_match
TRIO_ARGS2((string, pattern),
         TRIO_CONST char *string,
         TRIO_CONST char *pattern)
{
  assert(string);
  assert(pattern);
  
  for (; ('*' != *pattern); ++pattern, ++string)
    {
      if (NIL == *string)
      {
        return (NIL == *pattern);
      }
      if ((internal_to_upper((int)*string) != internal_to_upper((int)*pattern))
        && ('?' != *pattern))
      {
        return FALSE;
      }
    }
  /* two-line patch to prevent *too* much recursiveness: */
  while ('*' == pattern[1])
    pattern++;

  do
    {
      if ( trio_match(string, &pattern[1]) )
      {
        return TRUE;
      }
    }
  while (*string++);
  
  return FALSE;
}

#endif

/**
   Compare two strings using wildcards.

   @param string String to be searched.
   @param pattern Pattern, including wildcards, to search for.
   @return Boolean value indicating success or failure.

   Case-sensitive comparison.
   
   The following wildcards can be used
   @li @c * Match any number of characters.
   @li @c ? Match a single character.
*/
#if defined(TRIO_FUNC_MATCH_CASE)

TRIO_PUBLIC_STRING int
trio_match_case
TRIO_ARGS2((string, pattern),
         TRIO_CONST char *string,
         TRIO_CONST char *pattern)
{
  assert(string);
  assert(pattern);
  
  for (; ('*' != *pattern); ++pattern, ++string)
    {
      if (NIL == *string)
      {
        return (NIL == *pattern);
      }
      if ((*string != *pattern)
        && ('?' != *pattern))
      {
        return FALSE;
      }
    }
  /* two-line patch to prevent *too* much recursiveness: */
  while ('*' == pattern[1])
    pattern++;

  do
    {
      if ( trio_match_case(string, &pattern[1]) )
      {
        return TRUE;
      }
    }
  while (*string++);
  
  return FALSE;
}

#endif

/**
   Execute a function on each character in string.

   @param target Target string.
   @param source Source string.
   @param Function Function to be executed.
   @return Number of processed characters.
*/
#if defined(TRIO_FUNC_SPAN_FUNCTION)

TRIO_PUBLIC_STRING size_t
trio_span_function
TRIO_ARGS3((target, source, Function),
         char *target,
         TRIO_CONST char *source,
         int (*Function) TRIO_PROTO((int)))
{
  size_t count = 0;

  assert(target);
  assert(source);
  assert(Function);
  
  while (*source != NIL)
    {
      *target++ = Function(*source++);
      count++;
    }
  return count;
}

#endif

/**
   Search for a substring in a string.

   @param string String to be searched.
   @param substring String to be found.
   @return Pointer to first occurrence of @p substring in @p string, or NULL
   if no match was found.
*/
#if defined(TRIO_FUNC_SUBSTRING)

TRIO_PUBLIC_STRING char *
trio_substring
TRIO_ARGS2((string, substring),
         TRIO_CONST char *string,
         TRIO_CONST char *substring)
{
  assert(string);
  assert(substring);

  return strstr(string, substring);
}

#endif

/**
   Search for a substring in the first @p max characters of a string.

   @param string String to be searched.
   @param max Maximum characters to be searched.
   @param substring String to be found.
   @return Pointer to first occurrence of @p substring in @p string, or NULL
   if no match was found.
*/
#if defined(TRIO_FUNC_SUBSTRING_MAX)

TRIO_PUBLIC_STRING char *
trio_substring_max
TRIO_ARGS3((string, max, substring),
         TRIO_CONST char *string,
         size_t max,
         TRIO_CONST char *substring)
{
  size_t count;
  size_t size;
  char *result = NULL;

  assert(string);
  assert(substring);
  
  size = trio_length(substring);
  if (size <= max)
    {
      for (count = 0; count <= max - size; count++)
      {
        if (trio_equal_max(substring, size, &string[count]))
          {
            result = (char *)&string[count];
            break;
          }
      }
    }
  return result;
}

#endif

/**
   Tokenize string.

   @param string String to be tokenized.
   @param delimiters String containing list of delimiting characters.
   @return Start of new token.

   @warning @p string will be destroyed.
*/
#if defined(TRIO_FUNC_TOKENIZE)

TRIO_PUBLIC_STRING char *
trio_tokenize
TRIO_ARGS2((string, delimiters),
         char *string,
         TRIO_CONST char *delimiters)
{
  assert(delimiters);
  
  return strtok(string, delimiters);
}

#endif

/**
   Convert string to floating-point number.

   @param source String to be converted.
   @param endp Pointer to end of the converted string.
   @return A floating-point number.

   The following Extended Backus-Naur form is used
   @verbatim
   double        ::= [ <sign> ]
                     ( <number> |
                       <number> <decimal_point> <number> |
                       <decimal_point> <number> )
                     [ <exponential> [ <sign> ] <number> ]
   number        ::= 1*( <digit> )
   digit         ::= ( '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7' | '8' | '9' )
   exponential   ::= ( 'e' | 'E' )
   sign          ::= ( '-' | '+' )
   decimal_point ::= '.'
   @endverbatim
*/
#if defined(TRIO_FUNC_TO_LONG_DOUBLE)

/* FIXME: Add EBNF for hex-floats */
TRIO_PUBLIC_STRING trio_long_double_t
trio_to_long_double
TRIO_ARGS2((source, endp),
         TRIO_CONST char *source,
         char **endp)
{
# if defined(USE_STRTOLD)
  return strtold(source, endp);
# else
  int isNegative = FALSE;
  int isExponentNegative = FALSE;
  trio_long_double_t integer = 0.0;
  trio_long_double_t fraction = 0.0;
  unsigned long exponent = 0;
  trio_long_double_t base;
  trio_long_double_t fracdiv = 1.0;
  trio_long_double_t value = 0.0;

  /* First try hex-floats */
  if ((source[0] == '0') && ((source[1] == 'x') || (source[1] == 'X')))
    {
      base = 16.0;
      source += 2;
      while (isxdigit((int)*source))
      {
        integer *= base;
        integer += (isdigit((int)*source)
                  ? (*source - '0')
                  : 10 + (internal_to_upper((int)*source) - 'A'));
        source++;
      }
      if (*source == '.')
      {
        source++;
        while (isxdigit((int)*source))
          {
            fracdiv /= base;
            fraction += fracdiv * (isdigit((int)*source)
                             ? (*source - '0')
                             : 10 + (internal_to_upper((int)*source) - 'A'));
            source++;
          }
        if ((*source == 'p') || (*source == 'P'))
          {
            source++;
            if ((*source == '+') || (*source == '-'))
            {
              isExponentNegative = (*source == '-');
              source++;
            }
            while (isdigit((int)*source))
            {
              exponent *= 10;
              exponent += (*source - '0');
              source++;
            }
          }
      }
      /* For later use with exponent */
      base = 2.0;
    }
  else /* Then try normal decimal floats */
    {
      base = 10.0;
      isNegative = (*source == '-');
      /* Skip sign */
      if ((*source == '+') || (*source == '-'))
      source++;

      /* Integer part */
      while (isdigit((int)*source))
      {
        integer *= base;
        integer += (*source - '0');
        source++;
      }

      if (*source == '.')
      {
        source++; /* skip decimal point */
        while (isdigit((int)*source))
          {
            fracdiv /= base;
            fraction += (*source - '0') * fracdiv;
            source++;
          }
      }
      if ((*source == 'e')
        || (*source == 'E')
#  if TRIO_MICROSOFT
        || (*source == 'd')
        || (*source == 'D')
#  endif
        )
      {
        source++; /* Skip exponential indicator */
        isExponentNegative = (*source == '-');
        if ((*source == '+') || (*source == '-'))
          source++;
        while (isdigit((int)*source))
          {
            exponent *= (int)base;
            exponent += (*source - '0');
            source++;
          }
      }
    }
  
  value = integer + fraction;
  if (exponent != 0)
    {
      if (isExponentNegative)
      value /= trio_powl(base, (trio_long_double_t)exponent);
      else
      value *= trio_powl(base, (trio_long_double_t)exponent);
    }
  if (isNegative)
    value = -value;

  if (endp)
    *endp = (char *)source;
  return value;
# endif
}

#endif

/**
   Convert string to floating-point number.

   @param source String to be converted.
   @param endp Pointer to end of the converted string.
   @return A floating-point number.

   See @ref trio_to_long_double.
*/
#if defined(TRIO_FUNC_TO_DOUBLE)

TRIO_PUBLIC_STRING double
trio_to_double
TRIO_ARGS2((source, endp),
         TRIO_CONST char *source,
         char **endp)
{
#if defined(USE_STRTOD)
  return strtod(source, endp);
#else
  return (double)trio_to_long_double(source, endp);
#endif
}

#endif

/**
   Convert string to floating-point number.

   @param source String to be converted.
   @param endp Pointer to end of the converted string.
   @return A floating-point number.

   See @ref trio_to_long_double.
*/
#if defined(TRIO_FUNC_TO_FLOAT)

TRIO_PUBLIC_STRING float
trio_to_float
TRIO_ARGS2((source, endp),
         TRIO_CONST char *source,
         char **endp)
{
#  if defined(USE_STRTOF)
  return strtof(source, endp);
#  else
  return (float)trio_to_long_double(source, endp);
#  endif
}

#endif

/**
   Convert string to signed integer.

   @param string String to be converted.
   @param endp Pointer to end of converted string.
   @param base Radix number of number.
*/
#if defined(TRIO_FUNC_TO_LONG)

TRIO_PUBLIC_STRING long
trio_to_long
TRIO_ARGS3((string, endp, base),
         TRIO_CONST char *string,
         char **endp,
         int base)
{
  assert(string);
  assert((base >= 2) && (base <= 36));
  
  return strtol(string, endp, base);
}

#endif

/**
   Convert one alphabetic letter to lower-case.

   @param source The letter to be converted.
   @return The converted letter.
*/
#if defined(TRIO_FUNC_TO_LOWER)

TRIO_PUBLIC_STRING int
trio_to_lower
TRIO_ARGS1((source),
         int source)
{
# if defined(USE_TOLOWER)
  
  return tolower(source);
  
# else

  /* Does not handle locales or non-contiguous alphabetic characters */
  return ((source >= (int)'A') && (source <= (int)'Z'))
    ? source - 'A' + 'a'
    : source;
  
# endif
}

#endif

/**
   Convert string to unsigned integer.

   @param string String to be converted.
   @param endp Pointer to end of converted string.
   @param base Radix number of number.
*/
#if defined(TRIO_FUNC_TO_UNSIGNED_LONG)

TRIO_PUBLIC_STRING unsigned long
trio_to_unsigned_long
TRIO_ARGS3((string, endp, base),
         TRIO_CONST char *string,
         char **endp,
         int base)
{
  assert(string);
  assert((base >= 2) && (base <= 36));
  
  return strtoul(string, endp, base);
}

#endif

/**
   Convert one alphabetic letter to upper-case.

   @param source The letter to be converted.
   @return The converted letter.
*/
#if defined(TRIO_FUNC_TO_UPPER)

TRIO_PUBLIC_STRING int
trio_to_upper
TRIO_ARGS1((source),
         int source)
{
  return internal_to_upper(source);
}

#endif

/**
   Convert the alphabetic letters in the string to upper-case.

   @param target The string to be converted.
   @return The number of processed characters (converted or not).
*/
#if defined(TRIO_FUNC_UPPER)

TRIO_PUBLIC_STRING int
trio_upper
TRIO_ARGS1((target),
         char *target)
{
  assert(target);

  return trio_span_function(target, target, internal_to_upper);
}

#endif

/** @} End of StaticStrings */


/*************************************************************************
 * Dynamic String Functions
 */

#if defined(TRIO_DOCUMENTATION)
# include "doc/doc_dynamic.h"
#endif
/** @addtogroup DynamicStrings
    @{
*/

/**
   Create a new dynamic string.
   
   @param initial_size Initial size of the buffer.
   @return Newly allocated dynamic string, or NULL if memory allocation failed.
*/
#if defined(TRIO_FUNC_STRING_CREATE)

TRIO_PUBLIC_STRING trio_string_t *
trio_string_create
TRIO_ARGS1((initial_size),
         int initial_size)
{
  trio_string_t *self;

  self = internal_string_alloc();
  if (self)
    {
      if (internal_string_grow(self,
                   (size_t)((initial_size > 0) ? initial_size : 1)))
      {
        self->content[0] = (char)0;
        self->allocated = initial_size;
      }
      else
      {
        trio_string_destroy(self);
        self = NULL;
      }
    }
  return self;
}

#endif

/**
   Deallocate the dynamic string and its contents.
   
   @param self Dynamic string
*/
#if defined(TRIO_FUNC_STRING_DESTROY)

TRIO_PUBLIC_STRING void
trio_string_destroy
TRIO_ARGS1((self),
         trio_string_t *self)
{
  assert(self);
  
  if (self)
    {
      trio_destroy(self->content);
      TRIO_FREE(self);
    }
}

#endif

/**
   Get a pointer to the content.
   
   @param self Dynamic string.
   @param offset Offset into content.
   @return Pointer to the content.
   
   @p Offset can be zero, positive, or negative. If @p offset is zero,
   then the start of the content will be returned. If @p offset is positive,
   then a pointer to @p offset number of characters from the beginning of the
   content is returned. If @p offset is negative, then a pointer to @p offset
   number of characters from the ending of the string, starting at the
   terminating zero, is returned.
*/
#if defined(TRIO_FUNCT_STRING_GET)

TRIO_PUBLIC_STRING char *
trio_string_get
TRIO_ARGS2((self, offset),
         trio_string_t *self,
         int offset)
{
  char *result = NULL;
  
  assert(self);

  if (self->content != NULL)
    {
      if (self->length == 0)
      {
        (void)trio_string_length(self);
      }
      if (offset >= 0)
      {
        if (offset > (int)self->length)
          {
            offset = self->length;
          }
      }
      else
      {
        offset += self->length + 1;
        if (offset < 0)
          {
            offset = 0;
          }
      }
      result = &(self->content[offset]);
    }
  return result;
}

#endif

/**
   Extract the content.
   
   @param self Dynamic String
   @return Content of dynamic string.
   
   The content is removed from the dynamic string. This enables destruction
   of the dynamic string without deallocation of the content.
*/
#if defined(TRIO_FUNC_STRING_EXTRACT)

TRIO_PUBLIC_STRING char *
trio_string_extract
TRIO_ARGS1((self),
         trio_string_t *self)
{
  char *result;
  
  assert(self);

  result = self->content;
  /* FIXME: Allocate new empty buffer? */
  self->content = NULL;
  self->length = self->allocated = 0;
  return result;
}

#endif

/**
   Set the content of the dynamic string.
   
   @param self Dynamic String
   @param buffer The new content.
   
   Sets the content of the dynamic string to a copy @p buffer.
   An existing content will be deallocated first, if necessary.
   
   @remark
   This function will make a copy of @p buffer.
   You are responsible for deallocating @p buffer yourself.
*/
#if defined(TRIO_FUNC_XSTRING_SET)

TRIO_PUBLIC_STRING void
trio_xstring_set
TRIO_ARGS2((self, buffer),
         trio_string_t *self,
         char *buffer)
{
  assert(self);

  trio_destroy(self->content);
  self->content = trio_duplicate(buffer);
}

#endif

/*
 * trio_string_size
 */
#if defined(TRIO_FUNC_STRING_SIZE)

TRIO_PUBLIC_STRING int
trio_string_size
TRIO_ARGS1((self),
         trio_string_t *self)
{
  assert(self);

  return self->allocated;
}

#endif

/*
 * trio_string_terminate
 */
#if defined(TRIO_FUNC_STRING_TERMINATE)

TRIO_PUBLIC_STRING void
trio_string_terminate
TRIO_ARGS1((self),
         trio_string_t *self)
{
  trio_xstring_append_char(self, 0);
}

#endif

/**
   Append the second string to the first.
   
   @param self Dynamic string to be modified.
   @param other Dynamic string to copy from.
   @return Boolean value indicating success or failure.
*/
#if defined(TRIO_FUNC_STRING_APPEND)

TRIO_PUBLIC_STRING int
trio_string_append
TRIO_ARGS2((self, other),
         trio_string_t *self,
         trio_string_t *other)
{
  size_t length;
  
  assert(self);
  assert(other);

  length = self->length + other->length;
  if (!internal_string_grow_to(self, length))
    goto error;
  trio_copy(&self->content[self->length], other->content);
  self->length = length;
  return TRUE;
  
 error:
  return FALSE;
}

#endif


/*
 * trio_xstring_append
 */
#if defined(TRIO_FUNC_XSTRING_APPEND)

TRIO_PUBLIC_STRING int
trio_xstring_append
TRIO_ARGS2((self, other),
         trio_string_t *self,
         TRIO_CONST char *other)
{
  size_t length;
  
  assert(self);
  assert(other);

  length = self->length + trio_length(other);
  if (!internal_string_grow_to(self, length))
    goto error;
  trio_copy(&self->content[self->length], other);
  self->length = length;
  return TRUE;
  
 error:
  return FALSE;
}

#endif

/*
 * trio_xstring_append_char
 */
#if defined(TRIO_FUNC_XSTRING_APPEND_CHAR)

TRIO_PUBLIC_STRING int
trio_xstring_append_char
TRIO_ARGS2((self, character),
         trio_string_t *self,
         char character)
{
  assert(self);

  if ((int)self->length >= trio_string_size(self))
    {
      if (!internal_string_grow(self, 0))
      goto error;
    }
  self->content[self->length] = character;
  self->length++;
  return TRUE;
  
 error:
  return FALSE;
}

#endif

/**
   Search for the first occurrence of second parameter in the first.
   
   @param self Dynamic string to be modified.
   @param other Dynamic string to copy from.
   @return Boolean value indicating success or failure.
*/
#if defined(TRIO_FUNC_STRING_CONTAINS)

TRIO_PUBLIC_STRING int
trio_string_contains
TRIO_ARGS2((self, other),
         trio_string_t *self,
         trio_string_t *other)
{
  assert(self);
  assert(other);

  return trio_contains(self->content, other->content);
}

#endif

/*
 * trio_xstring_contains
 */
#if defined(TRIO_FUNC_XSTRING_CONTAINS)

TRIO_PUBLIC_STRING int
trio_xstring_contains
TRIO_ARGS2((self, other),
         trio_string_t *self,
         TRIO_CONST char *other)
{
  assert(self);
  assert(other);

  return trio_contains(self->content, other);
}

#endif

/*
 * trio_string_copy
 */
#if defined(TRIO_FUNC_STRING_COPY)

TRIO_PUBLIC_STRING int
trio_string_copy
TRIO_ARGS2((self, other),
         trio_string_t *self,
         trio_string_t *other)
{
  assert(self);
  assert(other);

  self->length = 0;
  return trio_string_append(self, other);
}

#endif


/*
 * trio_xstring_copy
 */
#if defined(TRIO_FUNC_XSTRING_COPY)

TRIO_PUBLIC_STRING int
trio_xstring_copy
TRIO_ARGS2((self, other),
         trio_string_t *self,
         TRIO_CONST char *other)
{
  assert(self);
  assert(other);

  self->length = 0;
  return trio_xstring_append(self, other);
}

#endif

/*
 * trio_string_duplicate
 */
#if defined(TRIO_FUNC_STRING_DUPLICATE)

TRIO_PUBLIC_STRING trio_string_t *
trio_string_duplicate
TRIO_ARGS1((other),
         trio_string_t *other)
{
  trio_string_t *self;
  
  assert(other);

  self = internal_string_alloc();
  if (self)
    {
      self->content = internal_duplicate_max(other->content, other->length);
      if (self->content)
      {
        self->length = other->length;
        self->allocated = self->length + 1;
      }
      else
      {
        self->length = self->allocated = 0;
      }
    }
  return self;
}

#endif

/*
 * trio_xstring_duplicate
 */
#if defined(TRIO_FUNC_XSTRING_DUPLICATE)

TRIO_PUBLIC_STRING trio_string_t *
trio_xstring_duplicate
TRIO_ARGS1((other),
         TRIO_CONST char *other)
{
  trio_string_t *self;
  
  assert(other);

  self = internal_string_alloc();
  if (self)
    {
      self->content = internal_duplicate_max(other, trio_length(other));
      if (self->content)
      {
        self->length = trio_length(self->content);
        self->allocated = self->length + 1;
      }
      else
      {
        self->length = self->allocated = 0;
      }
    }
  return self;
}

#endif

/*
 * trio_string_equal
 */
#if defined(TRIO_FUNC_STRING_EQUAL)

TRIO_PUBLIC_STRING int
trio_string_equal
TRIO_ARGS2((self, other),
         trio_string_t *self,
         trio_string_t *other)
{
  assert(self);
  assert(other);

  return trio_equal(self->content, other->content);
}

#endif


/*
 * trio_xstring_equal
 */
#if defined(TRIO_FUNC_XSTRING_EQUAL)

TRIO_PUBLIC_STRING int
trio_xstring_equal
TRIO_ARGS2((self, other),
         trio_string_t *self,
         TRIO_CONST char *other)
{
  assert(self);
  assert(other);

  return trio_equal(self->content, other);
}

#endif

/*
 * trio_string_equal_max
 */
#if defined(TRIO_FUNC_STRING_EQUAL_MAX)

TRIO_PUBLIC_STRING int
trio_string_equal_max
TRIO_ARGS3((self, max, other),
         trio_string_t *self,
         size_t max,
         trio_string_t *other)
{
  assert(self);
  assert(other);

  return trio_equal_max(self->content, max, other->content);
}
#endif

/*
 * trio_xstring_equal_max
 */
#if defined(TRIO_FUNC_XSTRING_EQUAL_MAX)

TRIO_PUBLIC_STRING int
trio_xstring_equal_max
TRIO_ARGS3((self, max, other),
         trio_string_t *self,
         size_t max,
         TRIO_CONST char *other)
{
  assert(self);
  assert(other);

  return trio_equal_max(self->content, max, other);
}

#endif

/*
 * trio_string_equal_case
 */
#if defined(TRIO_FUNC_STRING_EQUAL_CASE)

TRIO_PUBLIC_STRING int
trio_string_equal_case
TRIO_ARGS2((self, other),
         trio_string_t *self,
         trio_string_t *other)
{
  assert(self);
  assert(other);

  return trio_equal_case(self->content, other->content);
}

#endif

/*
 * trio_xstring_equal_case
 */
#if defined(TRIO_FUNC_XSTRING_EQUAL_CASE)

TRIO_PUBLIC_STRING int
trio_xstring_equal_case
TRIO_ARGS2((self, other),
         trio_string_t *self,
         TRIO_CONST char *other)
{
  assert(self);
  assert(other);

  return trio_equal_case(self->content, other);
}

#endif

/*
 * trio_string_equal_case_max
 */
#if defined(TRIO_FUNC_STRING_EQUAL_CASE_MAX)

TRIO_PUBLIC_STRING int
trio_string_equal_case_max
TRIO_ARGS3((self, max, other),
         trio_string_t *self,
         size_t max,
         trio_string_t *other)
{
  assert(self);
  assert(other);

  return trio_equal_case_max(self->content, max, other->content);
}

#endif

/*
 * trio_xstring_equal_case_max
 */
#if defined(TRIO_FUNC_XSTRING_EQUAL_CASE_MAX)

TRIO_PUBLIC_STRING int
trio_xstring_equal_case_max
TRIO_ARGS3((self, max, other),
         trio_string_t *self,
         size_t max,
         TRIO_CONST char *other)
{
  assert(self);
  assert(other);

  return trio_equal_case_max(self->content, max, other);
}

#endif

/*
 * trio_string_format_data_max
 */
#if defined(TRIO_FUNC_STRING_FORMAT_DATE_MAX)

TRIO_PUBLIC_STRING size_t
trio_string_format_date_max
TRIO_ARGS4((self, max, format, datetime),
         trio_string_t *self,
         size_t max,
         TRIO_CONST char *format,
         TRIO_CONST struct tm *datetime)
{
  assert(self);

  return trio_format_date_max(self->content, max, format, datetime);
}

#endif

/*
 * trio_string_index
 */
#if defined(TRIO_FUNC_STRING_INDEX)

TRIO_PUBLIC_STRING char *
trio_string_index
TRIO_ARGS2((self, character),
         trio_string_t *self,
         int character)
{
  assert(self);

  return trio_index(self->content, character);
}

#endif

/*
 * trio_string_index_last
 */
#if defined(TRIO_FUNC_STRING_INDEX_LAST)

TRIO_PUBLIC_STRING char *
trio_string_index_last
TRIO_ARGS2((self, character),
         trio_string_t *self,
         int character)
{
  assert(self);

  return trio_index_last(self->content, character);
}

#endif

/*
 * trio_string_length
 */
#if defined(TRIO_FUNC_STRING_LENGTH)

TRIO_PUBLIC_STRING int
trio_string_length
TRIO_ARGS1((self),
         trio_string_t *self)
{
  assert(self);

  if (self->length == 0)
    {
      self->length = trio_length(self->content);
    }
  return self->length;
}

#endif

/*
 * trio_string_lower
 */
#if defined(TRIO_FUNC_STRING_LOWER)

TRIO_PUBLIC_STRING int
trio_string_lower
TRIO_ARGS1((self),
         trio_string_t *self)
{
  assert(self);

  return trio_lower(self->content);
}

#endif

/*
 * trio_string_match
 */
#if defined(TRIO_FUNC_STRING_MATCH)

TRIO_PUBLIC_STRING int
trio_string_match
TRIO_ARGS2((self, other),
         trio_string_t *self,
         trio_string_t *other)
{
  assert(self);
  assert(other);

  return trio_match(self->content, other->content);
}

#endif

/*
 * trio_xstring_match
 */
#if defined(TRIO_FUNC_XSTRING_MATCH)

TRIO_PUBLIC_STRING int
trio_xstring_match
TRIO_ARGS2((self, other),
         trio_string_t *self,
         TRIO_CONST char *other)
{
  assert(self);
  assert(other);

  return trio_match(self->content, other);
}

#endif

/*
 * trio_string_match_case
 */
#if defined(TRIO_FUNC_STRING_MATCH_CASE)

TRIO_PUBLIC_STRING int
trio_string_match_case
TRIO_ARGS2((self, other),
         trio_string_t *self,
         trio_string_t *other)
{
  assert(self);
  assert(other);

  return trio_match_case(self->content, other->content);
}

#endif

/*
 * trio_xstring_match_case
 */
#if defined(TRIO_FUNC_XSTRING_MATCH_CASE)

TRIO_PUBLIC_STRING int
trio_xstring_match_case
TRIO_ARGS2((self, other),
         trio_string_t *self,
         TRIO_CONST char *other)
{
  assert(self);
  assert(other);

  return trio_match_case(self->content, other);
}

#endif

/*
 * trio_string_substring
 */
#if defined(TRIO_FUNC_STRING_SUBSTRING)

TRIO_PUBLIC_STRING char *
trio_string_substring
TRIO_ARGS2((self, other),
         trio_string_t *self,
         trio_string_t *other)
{
  assert(self);
  assert(other);

  return trio_substring(self->content, other->content);
}

#endif

/*
 * trio_xstring_substring
 */
#if defined(TRIO_FUNC_XSTRING_SUBSTRING)

TRIO_PUBLIC_STRING char *
trio_xstring_substring
TRIO_ARGS2((self, other),
         trio_string_t *self,
         TRIO_CONST char *other)
{
  assert(self);
  assert(other);

  return trio_substring(self->content, other);
}

#endif

/*
 * trio_string_upper
 */
#if defined(TRIO_FUNC_STRING_UPPER)

TRIO_PUBLIC_STRING int
trio_string_upper
TRIO_ARGS1((self),
         trio_string_t *self)
{
  assert(self);

  return trio_upper(self->content);
}

#endif

/** @} End of DynamicStrings */

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