man_argv.c

   1 /*      $Id: man_argv.c,v 1.1 2009/08/13 11:45:29 kristaps Exp $ */
   2 /*
   3  * Copyright (c) 2008, 2009 Kristaps Dzonsons <kristaps@kth.se>
   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 above
   7  * copyright notice and this permission notice appear in all copies.
   8  *
   9  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  10  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  11  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  12  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  13  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  14  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  15  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17 #include <sys/types.h>
  18
  19 #include <assert.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22
  23 #include "libman.h"
  24
  25
  26 int
  27 man_args(struct man *m, int line, int *pos, char *buf, char **v)
  28 {
  29
  30         assert(*pos);
  31         assert(' ' != buf[*pos]);
  32
  33         if (0 == buf[*pos])
  34                 return(ARGS_EOLN);
  35
  36         *v = &buf[*pos];
  37
  38         /*
  39          * Process a quoted literal.  A quote begins with a double-quote
  40          * and ends with a double-quote NOT preceded by a double-quote.
  41          * Whitespace is NOT involved in literal termination.
  42          */
  43
  44         if ('\"' == buf[*pos]) {
  45                 *v = &buf[++(*pos)];
  46
  47                 for ( ; buf[*pos]; (*pos)++) {
  48                         if ('\"' != buf[*pos])
  49                                 continue;
  50                         if ('\"' != buf[*pos + 1])
  51                                 break;
  52                         (*pos)++;
  53                 }
  54
  55                 if (0 == buf[*pos]) {
  56                         if ( ! man_pwarn(m, line, *pos, WTQUOTE))
  57                                 return(ARGS_ERROR);
  58                         return(ARGS_QWORD);
  59                 }
  60
  61                 buf[(*pos)++] = 0;
  62
  63                 if (0 == buf[*pos])
  64                         return(ARGS_QWORD);
  65
  66                 while (' ' == buf[*pos])
  67                         (*pos)++;
  68
  69                 if (0 == buf[*pos])
  70                         if ( ! man_pwarn(m, line, *pos, WTSPACE))
  71                                 return(ARGS_ERROR);
  72
  73                 return(ARGS_QWORD);
  74         }
  75
  76         /*
  77          * A non-quoted term progresses until either the end of line or
  78          * a non-escaped whitespace.
  79          */
  80
  81         for ( ; buf[*pos]; (*pos)++)
  82                 if (' ' == buf[*pos] && '\\' != buf[*pos - 1])
  83                         break;
  84
  85         if (0 == buf[*pos])
  86                 return(ARGS_WORD);
  87
  88         buf[(*pos)++] = 0;
  89
  90         while (' ' == buf[*pos])
  91                 (*pos)++;
  92
  93         if (0 == buf[*pos])
  94                 if ( ! man_pwarn(m, line, *pos, WTSPACE))
  95                         return(ARGS_ERROR);
  96
  97         return(ARGS_WORD);
  98 }
  99