./htsstrings.h

/* ------------------------------------------------------------ */
/*
HTTrack Website Copier, Offline Browser for Windows and Unix
Copyright (C) 1998-2015 Xavier Roche and other contributors

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This program is distributed in the hope that it will be useful,
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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You should have received a copy of the GNU General Public License
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Important notes:

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This would disgrace our work, and spoil the many hours we spent on it.

Please visit our Website: http://www.httrack.com
*/

/* ------------------------------------------------------------ */
/* File: Strings                                                */
/* Author: Xavier Roche                                         */
/* ------------------------------------------------------------ */

/* Safer Strings ; standalone .h library */

#ifndef HTS_STRINGS_DEFSTATIC
#define HTS_STRINGS_DEFSTATIC

/* System definitions. */
#include <string.h>

/* GCC extension */
#ifndef HTS_UNUSED
#ifdef __GNUC__
#define HTS_UNUSED __attribute__ ((unused))
#define HTS_STATIC static __attribute__ ((unused))
#define HTS_PRINTF_FUN(fmt, arg) __attribute__ ((format (printf, fmt, arg)))
#else
#define HTS_UNUSED
#define HTS_STATIC static
#define HTS_PRINTF_FUN(fmt, arg)
#endif
#endif

/** Forward definitions **/
#ifndef HTS_DEF_FWSTRUCT_String
#define HTS_DEF_FWSTRUCT_String
typedef struct String String;
#endif
#ifndef HTS_DEF_STRUCT_String
#define HTS_DEF_STRUCT_String
struct String {
  char *buffer_;
  size_t length_;
  size_t capacity_;
};
#endif

/** Allocator **/
#ifndef STRING_REALLOC
#define STRING_REALLOC(BUFF, SIZE) ( (char*) realloc(BUFF, SIZE) )
#define STRING_FREE(BUFF) free(BUFF)
#endif
#ifndef STRING_ASSERT
#include <assert.h>
#define STRING_ASSERT(EXP) assert(EXP)
#endif

/** An empty string **/
#define STRING_EMPTY { (char*) NULL, 0, 0 }

/** String buffer **/
#define StringBuff(BLK) ( (const char*) ((BLK).buffer_) )

/** String buffer (read/write) **/
#define StringBuffRW(BLK) ((BLK).buffer_)

/** String length **/
#define StringLength(BLK) ((BLK).length_)

/** String not empty ? **/
#define StringNotEmpty(BLK) ( StringLength(BLK) > 0 )

/** String capacity **/
#define StringCapacity(BLK) ((BLK).capacity_)

/** Subcharacter **/
#define StringSub(BLK, POS) ( StringBuff(BLK)[POS] )

/** Subcharacter (read/write) **/
#define StringSubRW(BLK, POS) ( StringBuffRW(BLK)[POS] )

/** Subcharacter (read/write) **/
#define StringSubRW(BLK, POS) ( StringBuffRW(BLK)[POS] )

/** Right subcharacter **/
#define StringRight(BLK, POS) ( StringBuff(BLK)[StringLength(BLK) - POS] )

/** Right subcharacter (read/write) **/
#define StringRightRW(BLK, POS) ( StringBuffRW(BLK)[StringLength(BLK) - POS] )

/** Remove the utter right character from the string. **/
#define StringPopRight(BLK) do { \
  StringBuffRW(BLK)[--StringLength(BLK)] = '\0'; \
} while(0)

/** Ensure the string is large enough for exactly CAPACITY bytes overall (including \0). **/
#define StringRoomTotal(BLK, CAPACITY) do { \
  const size_t capacity_ = (size_t) (CAPACITY); \
  while ((BLK).capacity_ < capacity_) { \
    if ((BLK).capacity_ < 16) { \
      (BLK).capacity_ = 16; \
    } else { \
      (BLK).capacity_ *= 2; \
    } \
    (BLK).buffer_ = STRING_REALLOC((BLK).buffer_, (BLK).capacity_); \
    STRING_ASSERT((BLK).buffer_ != NULL); \
  } \
} while(0)

/** Ensure the string is large enough for exactly SIZE more characters (not including \0). **/
#define StringRoom(BLK, SIZE) StringRoomTotal(BLK, StringLength(BLK) + (SIZE) + 1)

/** Return the RW buffer for a strcat() operation of at most SIZE characters. **/
#define StringBuffN(BLK, SIZE) StringBuffN_(&(BLK), SIZE)
HTS_STATIC char *StringBuffN_(String * blk, int size) {
  StringRoom(*blk, size);
  return StringBuffRW(*blk);
}

/** Initialize a string. **/
#define StringInit(BLK) do { \
  (BLK).buffer_ = NULL; \
  (BLK).capacity_ = 0; \
  (BLK).length_ = 0; \
} while(0)

/** Clear a string (set its length to 0) **/
#define StringClear(BLK) do { \
  (BLK).length_ = 0; \
  StringRoom(BLK, 0); \
  (BLK).buffer_[0] = '\0'; \
} while(0)

/** Set the length of a string to 'SIZE'. If SIZE is negative, check the size using strlen(). **/
#define StringSetLength(BLK, SIZE) do { \
  if (SIZE >= 0) { \
    (BLK).length_ = SIZE; \
  } else { \
    (BLK).length_ = strlen((BLK).buffer_); \
  } \
} while(0)

/** Free a string (release memory) **/
#define StringFree(BLK) do { \
  if ((BLK).buffer_ != NULL) { \
    STRING_FREE((BLK).buffer_); \
    (BLK).buffer_ = NULL; \
  } \
  (BLK).capacity_ = 0; \
  (BLK).length_ = 0; \
} while(0)

/** Assign an allocated pointer to a a string.
The pointer _MUST_ be compatible with STRING_REALLOC() and STRING_FREE() **/
#define StringSetBuffer(BLK, STR) do { \
  size_t len__ = strlen( STR ); \
  StringFree(BLK); \
  (BLK).buffer_ = ( STR ); \
  (BLK).capacity_ = len__; \
  (BLK).length_ = len__; \
} while(0)

/** Append a memory block to a string **/
#define StringMemcat(BLK, STR, SIZE) do { \
  const char* str_mc_ = (STR); \
  const size_t size_mc_ = (size_t) (SIZE); \
  StringRoom(BLK, size_mc_); \
  if (size_mc_ > 0) { \
    memcpy((BLK).buffer_ + (BLK).length_, str_mc_, size_mc_); \
    (BLK).length_ += size_mc_; \
  } \
  *((BLK).buffer_ + (BLK).length_) = '\0'; \
} while(0)

/** Copy a memory block to a string **/
#define StringMemcpy(BLK, STR, SIZE) do { \
  (BLK).length_ = 0; \
  StringMemcat(BLK, STR, SIZE); \
} while(0)

/** Add a character **/
#define StringAddchar(BLK, c) do { \
  String * const s__ = &(BLK); \
  char c__ = (c); \
  StringRoom(*s__, 1); \
  StringBuffRW(*s__)[StringLength(*s__)++] = c__; \
  StringBuffRW(*s__)[StringLength(*s__)  ] = 0; \
} while(0)

/** Acquire a string ; it's the client's responsability to free() it **/
HTS_STATIC char *StringAcquire(String * blk) {
  char *buff = StringBuffRW(*blk);

  StringBuffRW(*blk) = NULL;
  StringCapacity(*blk) = 0;
  StringLength(*blk) = 0;
  return buff;
}

/** Clone a string. **/
HTS_STATIC String StringDup(const String * src) {
  String s = STRING_EMPTY;

  StringMemcat(s, StringBuff(*src), StringLength(*src));
  return s;
}

/** Attach a string using a pointer. **/
HTS_STATIC void StringAttach(String * blk, char **str) {
  StringFree(*blk);
  if (str != NULL && *str != NULL) {
    StringBuffRW(*blk) = *str;
    StringCapacity(*blk) = StringLength(*blk) = strlen(StringBuff(*blk));
    *str = NULL;
  }
}

/** Append a string to another one. **/
#define StringCat(BLK, STR) do { \
  const char *const str__ = ( STR ); \
  if (str__ != NULL) { \
    const size_t size__ = strlen(str__); \
    StringMemcat(BLK, str__, size__); \
  } \
} while(0)

#define StringCatN(BLK, STR, SIZE) do { \
  const char *str__ = ( STR ); \
  if (str__ != NULL) { \
    size_t size__ = strlen(str__); \
    if (size__ > (SIZE)) { \
      size__ = (SIZE); \
    } \
    StringMemcat(BLK, str__, size__); \
  } \
} while(0)

#define StringCopyN(BLK, STR, SIZE) do { \
  const char *str__ = ( STR ); \
  const size_t usize__ = (SIZE); \
  (BLK).length_ = 0; \
  if (str__ != NULL) { \
    size_t size__ = strlen(str__); \
    if (size__ > usize__ ) { \
      size__ = usize__; \
    } \
    StringMemcat(BLK, str__, size__); \
  } else { \
    StringClear(BLK); \
  } \
} while(0)

#define StringCopyS(blk, blk2) StringCopyN(blk, (blk2).buffer_, (blk2).length_)

/** Copy a string to another one. **/
#define StringCopy(BLK, STR) do { \
  const char *str__ = ( STR ); \
  if (str__ != NULL) { \
    size_t size__ = strlen(str__); \
    StringMemcpy(BLK, str__, size__); \
  } else { \
    StringClear(BLK); \
  } \
} while(0)

/** Copy a (potentially overlapping) string to another one. **/
#define StringCopyOverlapped(BLK, STR) do { \
  String s__ = STRING_EMPTY; \
  StringCopy(s__, STR); \
  StringCopyS(BLK, s__); \
  StringFree(s__); \
} while(0)

#endif

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