Fix a bug about the iSCSI DHCP dependency issue.

[mirror_edk2.git] / StdLib / LibC / String / strsep.c

/*-\r
 * Copyright (c) 1990, 1993\r
 *  The Regents of the University of California.  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
 * 3. All advertising materials mentioning features or use of this software\r
 *    must display the following acknowledgement:\r
 *  This product includes software developed by the University of\r
 *  California, Berkeley and its contributors.\r
 * 4. Neither the name of the University nor the names of its contributors\r
 *    may be used to endorse or promote products derived from this software\r
 *    without specific prior written permission.\r
 *\r
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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
\r
#include <sys/cdefs.h>\r
#include <string.h>\r
#include <stdio.h>\r
\r
#if defined(LIBC_SCCS) && !defined(lint)\r
static char sccsid[] = "@(#)strsep.c  8.1 (Berkeley) 6/4/93";\r
#endif /* LIBC_SCCS and not lint */\r
\r
/*\r
 * Get next token from string *stringp, where tokens are possibly-empty\r
 * strings separated by characters from delim.\r
 *\r
 * Writes NULs into the string at *stringp to end tokens.\r
 * delim need not remain constant from call to call.\r
 * On return, *stringp points past the last NUL written (if there might\r
 * be further tokens), or is NULL (if there are definitely no more tokens).\r
 *\r
 * If *stringp is NULL, strsep returns NULL.\r
 */\r
char *\r
strsep(\r
  register char **stringp,\r
  register const char *delim\r
  )\r
{\r
  register char *s;\r
  register const char *spanp;\r
  register int c, sc;\r
  char *tok;\r
\r
  if ((s = *stringp) == NULL)\r
    return (NULL);\r
  for (tok = s;;) {\r
    c = *s++;\r
    spanp = delim;\r
    do {\r
      if ((sc = *spanp++) == c) {\r
        if (c == 0)\r
          s = NULL;\r
        else\r
          s[-1] = 0;\r
        *stringp = s;\r
        return (tok);\r
      }\r
    } while (sc != 0);\r
  }\r
  /* NOTREACHED */\r
}\r