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vecload.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2009 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * Glenn Fowler
 * AT&T Bell Laboratories
 *
 * string vector load support
 */

#include <ast.h>
#include <vecargs.h>

/*
 * load a string vector from lines in buf
 * buf may be modified on return
 *
 * each line in buf is treated as a new vector element
 * lines with # as first char are comments
 * \ as the last char joins consecutive lines
 *
 * the vector ends with a 0 sentinel
 *
 * the string array pointer is returned
 */

char**
vecload(char* buf)
{
      register char*    s;
      register int      n;
      register char**   p;
      char**            vec;

      vec = 0;
      n = (*buf == '#') ? -1 : 0;
      for (s = buf;; s++)
      {
            if (*s == '\n')
            {
                  if (s > buf && *(s - 1) == '\\') *(s - 1) = *s = ' ';
                  else
                  {
                        *s = 0;
                        if (*(s + 1) != '#')
                        {
                              n++;
                              if (!*(s + 1)) break;
                        }
                  }
            }
            else if (!*s)
            {
                  n++;
                  break;
            }
      }
      if (n < 0) n = 0;
      if (p = newof(0, char*, n + 3, 0))
      {
            *p++ = s = buf;
            vec = ++p;
            if (n > 0) for (;;)
            {
                  if (*s != '#')
                  {
                        *p++ = s;
                        if (--n <= 0) break;
                  }
                  while (*s) s++;
                  s++;
            }
            *p = 0;
            *(vec - 1) = (char*)p;
      }
      return(vec);
}

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