Standard Libraries for EDK II.

[mirror_edk2.git] / StdLib / LibC / Locale / aliasname.c

/* $NetBSD: aliasname.c,v 1.2 2005/02/09 21:35:46 kleink Exp $ */\r
\r
/*-\r
 * Copyright (c)2002 YAMAMOTO Takashi,\r
 * All rights reserved.\r
 *\r
 * Redistribution and use in source and binary forms, with or without\r
 * modification, are permitted provided that the following conditions\r
 * are met:\r
 * 1. Redistributions of source code must retain the above copyright\r
 *    notice, this list of conditions and the following disclaimer.\r
 * 2. Redistributions in binary form must reproduce the above copyright\r
 *    notice, this list of conditions and the following disclaimer in the\r
 *    documentation and/or other materials provided with the distribution.\r
 *\r
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND\r
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\r
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\r
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE\r
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL\r
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS\r
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)\r
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT\r
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY\r
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF\r
 * SUCH DAMAGE.\r
 */\r
#include  <LibConfig.h>\r
#include  <sys/EfiCdefs.h>\r
#if defined(LIBC_SCCS) && !defined(lint)\r
__RCSID("$NetBSD: aliasname.c,v 1.2 2005/02/09 21:35:46 kleink Exp $");\r
#endif /* LIBC_SCCS and not lint */\r
\r
#include "namespace.h"\r
#include <assert.h>\r
#include <stdio.h>\r
#include <string.h>\r
\r
#include "aliasname_local.h"\r
\r
__inline int __is_ws(char);\r
\r
__inline int __is_ws(char ch)\r
{\r
\r
  return (ch == ' ' || ch == '\t');\r
}\r
\r
const char *\r
__unaliasname(const char *dbname, const char *alias, void *buf, size_t bufsize)\r
{\r
  FILE *fp = NULL;\r
  const char *result = alias;\r
  size_t resultlen;\r
  size_t aliaslen;\r
  const char *p;\r
  size_t len;\r
\r
  _DIAGASSERT(dbname != NULL);\r
  _DIAGASSERT(alias != NULL);\r
  _DIAGASSERT(buf != NULL);\r
\r
  fp = fopen(dbname, "r");\r
  if (fp == NULL)\r
    goto quit;\r
\r
  aliaslen = strlen(alias);\r
\r
  while (/*CONSTCOND*/ 1) {\r
    p = fgetln(fp, &len);\r
    if (p == NULL)\r
      goto quit; /* eof or error */\r
\r
    _DIAGASSERT(len != 0);\r
\r
    /* ignore terminating NL */\r
    if (p[len - 1] == '\n')\r
      len--;\r
\r
    /* ignore null line and comment */\r
    if (len == 0 || p[0] == '#')\r
      continue;\r
\r
    if (aliaslen > len)\r
      continue;\r
\r
    if (memcmp(alias, p, aliaslen))\r
      continue;\r
\r
    p += aliaslen;\r
    len -= aliaslen;\r
\r
    if (len == 0 || !__is_ws(*p))\r
      continue;\r
\r
    /* entry was found here */\r
    break;\r
\r
    /* NOTREACHED */\r
  }\r
\r
  /* skip white spaces */\r
  do {\r
    p++;\r
    len--;\r
  } while (len != 0 && __is_ws(*p));\r
\r
  if (len == 0)\r
    goto quit;\r
\r
  /* count length of result */\r
  resultlen = 0;\r
  while (resultlen < len && !__is_ws(*p))\r
    resultlen++;\r
\r
  /* check if space is enough */\r
  if (bufsize < resultlen + 1)\r
    goto quit;\r
\r
  memcpy(buf, p, resultlen);\r
  ((char *)buf)[resultlen] = 0;\r
  result = buf;\r
\r
quit:\r
  if (fp)\r
    fclose(fp);\r
\r
  return result;\r
}\r