man_macro.c

   1 /* $Id: man_macro.c,v 1.3 2009/03/23 15:20:51 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@openbsd.org>
   4  *
   5  * Permission to use, copy, modify, and distribute this software for any
   6  * purpose with or without fee is hereby granted, provided that the
   7  * above copyright notice and this permission notice appear in all
   8  * copies.
   9  *
  10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
  11  * WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
  12  * WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
  13  * AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  14  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  15  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
  16  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19 #include <assert.h>
  20 #include <ctype.h>
  21 #include <err.h> /* XXX */
  22 #include <stdlib.h>
  23 #include <stdio.h>
  24 #include <string.h>
  25
  26 #include "libman.h"
  27
  28 static  int              man_args(struct man *, int,
  29                                 int *, char *, char **);
  30
  31
  32 int
  33 man_macro(struct man *man, int tok, int line,
  34                 int ppos, int *pos, char *buf)
  35 {
  36         int              w, la;
  37         char            *p;
  38         struct man_node *n;
  39
  40         if ( ! man_elem_alloc(man, line, ppos, tok))
  41                 return(0);
  42         n = man->last;
  43         man->next = MAN_NEXT_CHILD;
  44
  45         for (;;) {
  46                 la = *pos;
  47                 w = man_args(man, line, pos, buf, &p);
  48
  49                 if (-1 == w)
  50                         return(0);
  51                 if (0 == w)
  52                         break;
  53
  54                 if ( ! man_word_alloc(man, line, la, p))
  55                         return(0);
  56                 man->next = MAN_NEXT_SIBLING;
  57         }
  58
  59         /* TODO: validate. */
  60         /* TODO: validate. */
  61
  62         man->last = n;
  63         man->next = MAN_NEXT_SIBLING;
  64
  65         return(1);
  66 }
  67
  68
  69 /* ARGSUSED */
  70 int
  71 man_args(struct man *man, int line,
  72                 int *pos, char *buf, char **v)
  73 {
  74
  75         if (0 == buf[*pos])
  76                 return(0);
  77
  78         /* First parse non-quoted strings. */
  79
  80         if ('\"' != buf[*pos]) {
  81                 *v = &buf[*pos];
  82
  83                 while (buf[*pos]) {
  84                         if (' ' == buf[*pos])
  85                                 if ('\\' != buf[*pos - 1])
  86                                         break;
  87                         (*pos)++;
  88                 }
  89
  90                 if (0 == buf[*pos])
  91                         return(1);
  92
  93                 buf[(*pos)++] = 0;
  94
  95                 if (0 == buf[*pos])
  96                         return(1);
  97
  98                 while (buf[*pos] && ' ' == buf[*pos])
  99                         (*pos)++;
 100
 101                 if (buf[*pos])
 102                         return(1);
 103
 104                 warnx("tail whitespace");
 105                 return(-1);
 106         }
 107
 108         /*
 109          * If we're a quoted string (and quoted strings are allowed),
 110          * then parse ahead to the next quote.  If none's found, it's an
 111          * error.  After, parse to the next word.
 112          */
 113
 114         *v = &buf[++(*pos)];
 115
 116         while (buf[*pos] && '\"' != buf[*pos])
 117                 (*pos)++;
 118
 119         if (0 == buf[*pos]) {
 120                 warnx("unterminated quotation");
 121                 return(-1);
 122         }
 123
 124         buf[(*pos)++] = 0;
 125         if (0 == buf[*pos])
 126                 return(1);
 127
 128         while (buf[*pos] && ' ' == buf[*pos])
 129                 (*pos)++;
 130
 131         if (buf[*pos])
 132                 return(1);
 133
 134         warnx("tail whitespace");
 135         return(-1);
 136 }