thodg/libgit2/src/oid.c

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• Hash : 64a47c01
  Author :
  Date : 2008-12-30T23:21:36
  

  Wrap malloc and friends and report out of memory as GIT_ENOMEM We now forbid direct use of malloc, strdup or calloc within the library and instead use wrapper functions git__malloc, etc. to invoke the underlying library malloc and set git_errno to a no memory error code if the allocation fails. In the future once we have pack objects in memory we are likely to enhance these routines with garbage collection logic to purge cached pack data when allocations fail. Because the size of the function will grow somewhat large, we don't want to mark them for inline as gcc tends to aggressively inline, creating larger than expected executables. Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

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• src/oid.c

• /*
   * This file is free software; you can redistribute it and/or modify
   * it under the terms of the GNU General Public License, version 2,
   * as published by the Free Software Foundation.
   *
   * In addition to the permissions in the GNU General Public License,
   * the authors give you unlimited permission to link the compiled
   * version of this file into combinations with other programs,
   * and to distribute those combinations without any restriction
   * coming from the use of this file.  (The General Public License
   * restrictions do apply in other respects; for example, they cover
   * modification of the file, and distribution when not linked into
   * a combined executable.)
   *
   * This file is distributed in the hope that it will be useful, but
   * WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * General Public License for more details.
   *
   * You should have received a copy of the GNU General Public License
   * along with this program; see the file COPYING.  If not, write to
   * the Free Software Foundation, 51 Franklin Street, Fifth Floor,
   * Boston, MA 02110-1301, USA.
   */
  
  #include "common.h"
  #include "git/oid.h"
  #include <string.h>
  
  static signed char from_hex[] = {
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 00 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 10 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 20 */
   0,  1,  2,  3,  4,  5,  6,  7,  8,  9, -1, -1, -1, -1, -1, -1, /* 30 */
  -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 40 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 50 */
  -1, 10, 11, 12, 13, 14, 15, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 60 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 70 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 80 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* 90 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* a0 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* b0 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* c0 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* d0 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* e0 */
  -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, /* f0 */
  };
  static char to_hex[] = "0123456789abcdef";
  
  int git_oid_mkstr(git_oid *out, const char *str)
  {
  	int p;
  	for (p = 0; p < sizeof(out->id); p++, str += 2) {
  		int v = (from_hex[(unsigned char)str[0]] << 4)
  		       | from_hex[(unsigned char)str[1]];
  		if (v < 0)
  			return GIT_ENOTOID;
  		out->id[p] = (unsigned char)v;
  	}
  	return GIT_SUCCESS;
  }
  
  GIT_INLINE(char) *fmt_one(char *str, unsigned int val)
  {
  	*str++ = to_hex[val >> 4];
  	*str++ = to_hex[val & 0xf];
  	return str;
  }
  
  void git_oid_fmt(char *str, const git_oid *oid)
  {
  	int i;
  
  	for (i = 0; i < sizeof(oid->id); i++)
  		str = fmt_one(str, oid->id[i]);
  }
  
  void git_oid_pathfmt(char *str, const git_oid *oid)
  {
  	int i;
  
  	str = fmt_one(str, oid->id[0]);
  	*str++ = '/';
  	for (i = 1; i < sizeof(oid->id); i++)
  		str = fmt_one(str, oid->id[i]);
  }
  
  char *git_oid_allocfmt(const git_oid *oid)
  {
  	char *str = git__malloc(GIT_OID_HEXSZ + 1);
  	if (!str)
  		return NULL;
  	git_oid_fmt(str, oid);
  	str[GIT_OID_HEXSZ] = '\0';
  	return str;
  }
  

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