usr/src/lib/libast/common/vec/vecload.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23 /*
  24  * Glenn Fowler
  25  * AT&T Bell Laboratories
  26  *
  27  * string vector load support
  28  */
  29
  30 #include <ast.h>
  31 #include <vecargs.h>
  32
  33 /*
  34  * load a string vector from lines in buf
  35  * buf may be modified on return
  36  *
  37  * each line in buf is treated as a new vector element
  38  * lines with # as first char are comments
  39  * \ as the last char joins consecutive lines
  40  *
  41  * the vector ends with a 0 sentinel
  42  *
  43  * the string array pointer is returned
  44  */
  45
  46 char**
  47 vecload(char* buf)
  48 {
  49         register char*  s;
  50         register int    n;
  51         register char** p;
  52         char**          vec;
  53
  54         vec = 0;
  55         n = (*buf == '#') ? -1 : 0;
  56         for (s = buf;; s++)
  57         {
  58                 if (*s == '\n')
  59                 {
  60                         if (s > buf && *(s - 1) == '\\') *(s - 1) = *s = ' ';
  61                         else
  62                         {
  63                                 *s = 0;
  64                                 if (*(s + 1) != '#')
  65                                 {
  66                                         n++;
  67                                         if (!*(s + 1)) break;
  68                                 }
  69                         }
  70                 }
  71                 else if (!*s)
  72                 {
  73                         n++;
  74                         break;
  75                 }
  76         }
  77         if (n < 0) n = 0;
  78         if (p = newof(0, char*, n + 3, 0))
  79         {
  80                 *p++ = s = buf;
  81                 vec = ++p;
  82                 if (n > 0) for (;;)
  83                 {
  84                         if (*s != '#')
  85                         {
  86                                 *p++ = s;
  87                                 if (--n <= 0) break;
  88                         }
  89                         while (*s) s++;
  90                         s++;
  91                 }
  92                 *p = 0;
  93                 *(vec - 1) = (char*)p;
  94         }
  95         return(vec);
  96 }