thodg/libgit2/src/util.h

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• Hash : 47d8ec56
  Author :
  Date : 2011-04-03T17:18:56
  

  New external API method: `git_tree_create` Creates a tree by scanning the index file. The method handles recursive creation of trees for subdirectories and adds them to the parent tree.

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• src/util.h

• #ifndef INCLUDE_util_h__
  #define INCLUDE_util_h__
  
  #define ARRAY_SIZE(x) (sizeof(x)/sizeof(x[0]))
  #define bitsizeof(x)  (CHAR_BIT * sizeof(x))
  #define MSB(x, bits) ((x) & (~0ULL << (bitsizeof(x) - (bits))))
  
  /* 
   * Don't wrap malloc/calloc.
   * Use the default versions in glibc, and make
   * sure that any methods that allocate memory
   * return a GIT_ENOMEM error when allocation
   * fails.
   */
  #define git__malloc malloc
  #define git__calloc calloc
  #define git__realloc realloc
  #define git__strdup strdup
  
  extern int git__fmt(char *, size_t, const char *, ...)
  	GIT_FORMAT_PRINTF(3, 4);
  extern int git__prefixcmp(const char *str, const char *prefix);
  extern int git__suffixcmp(const char *str, const char *suffix);
  
  /*
   * The dirname() function shall take a pointer to a character string
   * that contains a pathname, and return a pointer to a string that is a
   * pathname of the parent directory of that file. Trailing '/' characters
   * in the path are not counted as part of the path.
   *
   * If path does not contain a '/', then dirname() shall return a pointer to
   * the string ".". If path is a null pointer or points to an empty string,
   * dirname() shall return a pointer to the string "." .
   *
   * The `git__dirname` implementation is thread safe. The returned 
   * string must be manually free'd.
   *
   * The `git__dirname_r` implementation expects a string allocated
   * by the user with big enough size.
   */
  extern char *git__dirname(const char *path);
  extern int git__dirname_r(char *buffer, size_t bufflen, const char *path);
  
  /*
   * This function returns the basename of the file, which is the last
   * part of its full name given by fname, with the drive letter and
   * leading directories stripped off. For example, the basename of
   * c:/foo/bar/file.ext is file.ext, and the basename of a:foo is foo.
   *
   * Trailing slashes and backslashes are significant: the basename of
   * c:/foo/bar/ is an empty string after the rightmost slash.
   *
   * The `git__basename` implementation is thread safe. The returned 
   * string must be manually free'd.
   *
   * The `git__basename_r` implementation expects a string allocated
   * by the user with big enough size.
   */
  extern char *git__basename(const char *path);
  extern int git__basename_r(char *buffer, size_t bufflen, const char *path);
  
  extern const char *git__topdir(const char *path);
  
  /**
   * Join two paths together. Takes care of properly fixing the
   * middle slashes and everything
   *
   * The paths are joined together into buffer_out; this is expected
   * to be an user allocated buffer of `GIT_PATH_MAX` size 
   */
  extern void git__joinpath_n(char *buffer_out, int npath, ...);
  
  GIT_INLINE(void) git__joinpath(char *buffer_out, const char *path_a, const char *path_b)
  {
  	git__joinpath_n(buffer_out, 2, path_a, path_b);
  }
  
  extern void git__hexdump(const char *buffer, size_t n);
  extern uint32_t git__hash(const void *key, int len, uint32_t seed);
  
  
  /** @return true if p fits into the range of a size_t */
  GIT_INLINE(int) git__is_sizet(git_off_t p)
  {
  	size_t r = (size_t)p;
  	return p == (git_off_t)r;
  }
  
  /* 32-bit cross-platform rotl */
  #ifdef _MSC_VER /* use built-in method in MSVC */
  #	define git__rotl(v, s) (uint32_t)_rotl(v, s)
  #else /* use bitops in GCC; with o2 this gets optimized to a rotl instruction */
  #	define git__rotl(v, s) (uint32_t)(((uint32_t)(v) << (s)) | ((uint32_t)(v) >> (32 - (s))))
  #endif
  
  extern char *git__strtok(char *output, char *src, char *delimit);
  extern char *git__strtok_keep(char *output, char *src, char *delimit);
  
  #define STRLEN(str) (sizeof(str) - 1)
  
  #define GIT_OID_LINE_LENGTH(header) (STRLEN(header) + 1 + GIT_OID_HEXSZ + 1)
  
  /*
   * Realloc the buffer pointed at by variable 'x' so that it can hold
   * at least 'nr' entries; the number of entries currently allocated
   * is 'alloc', using the standard growing factor alloc_nr() macro.
   *
   * DO NOT USE any expression with side-effect for 'x' or 'alloc'.
   */
  #define alloc_nr(x) (((x)+16)*3/2)
  #define ALLOC_GROW(x, nr, alloc) \
  	do { \
  		if ((nr) > alloc) { \
  			if (alloc_nr(alloc) < (nr)) \
  				alloc = (nr); \
  			else \
  				alloc = alloc_nr(alloc); \
  			x = xrealloc((x), alloc * sizeof(*(x))); \
  		} \
  	} while (0)
  
  #endif /* INCLUDE_util_h__ */
  

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