aboutsummaryrefslogtreecommitdiff
path: root/src/input-argv.c
blob: bb4ab7255e7fa5c14bd36226c886cf08eaa56be5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
/* This file is part of GDBM, the GNU data base manager.
   Copyright (C) 2018 Free Software Foundation, Inc.

   GDBM is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   GDBM is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GDBM. If not, see <http://www.gnu.org/licenses/>.    */

#include "gdbmtool.h"
#include <stdlib.h>

struct instream_argv
{
  struct instream base;  /* Base structure */
  int argc;              /* Number of arguments */
  char **argv;           /* Vector of arguments */
  int idx;               /* Index of the current argument */
  char *cur;             /* Current position in argv[idx] */
  int delim;             /* True if cur points to a delimiter */
  int quote;             /* True if the argument must be quoted */
};

static ssize_t
instream_argv_read (instream_t istr, char *buf, size_t size)
{
  size_t total = 0;
  struct instream_argv *i = (struct instream_argv*)istr;
  char const specials[] = " \"\t\n[]{},=";
  char const escapable[] = "\\\"";
  
  while (total < size)
    {
      if (*i->cur == 0)
	{
	  if (i->quote)
	    {
	      buf[total++] = '"';
	      i->quote = 0;
	      continue;
	    }
	  
	  if (i->idx == i->argc)
	    {
	      if (!i->delim)
		{
		  i->cur = "\n";
		  i->delim = 1;
		}
	      else
		break;
	    }
	  else if (!i->delim)
	    {
	      i->cur = " ";
	      i->delim = 1;
	    }
	  else
	    {
	      size_t len;
	      i->cur = i->argv[i->idx++];
	      i->delim = 0;
	      len = strlen (i->cur);
	      if (len > 1 && i->cur[0] == '"' && i->cur[len-1] == '"')
		i->quote = 0;
	      else if (i->cur[strcspn (i->cur, specials)])
		{
		  buf[total++] = '"';
		  i->quote = 1;
		  continue;
		}
	      else
		i->quote = 0;
	    }
	}
      
      if (strchr (escapable, *i->cur))
	{
	  if (total + 2 > size)
	    break;
	  buf[total++] = '\\';
	  i->cur++;
	}
      buf[total++] = *i->cur++;
    }
  return total;
}

static void
instream_argv_close (instream_t istr)
{
  struct instream_argv *i = (struct instream_argv *)istr;
  free (i);
}

static int
instream_argv_eq (instream_t a, instream_t b)
{
  return 0;
}

instream_t
instream_argv_create (int argc, char **argv)
{
  struct instream_argv *istr;

  istr = emalloc (sizeof *istr);
  istr->base.in_name = "argv";
  istr->base.in_inter = 0;
  istr->base.in_read = instream_argv_read;
  istr->base.in_close = instream_argv_close;
  istr->base.in_eq = instream_argv_eq;
  
  istr->argc = argc;
  istr->argv = argv;
  istr->idx = 0;
  istr->cur = "";
  istr->delim = 1;
  istr->quote = 0;
  
  return (instream_t) istr;
}


Return to:

Send suggestions and report system problems to the System administrator.