summaryrefslogtreecommitdiff
path: root/3rdparty/libconfig/scanctx.c
blob: 94ba73edd3d378c19fc74fc66c762e3500151472 (plain) (blame)
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
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
/* ----------------------------------------------------------------------------
   libconfig - A library for processing structured configuration files
   Copyright (C) 2013-2016  Hercules Dev Team
   Copyright (C) 2005-2014  Mark A Lindner

   This file is part of libconfig.

   This library 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 of the License, or
   (at your option) any later version.

   This library 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 this library.  If not, see <http://www.gnu.org/licenses/>.
   ----------------------------------------------------------------------------
*/

#include "scanctx.h"
#include "wincompat.h"

#include <stddef.h>
#include <stdlib.h>
#include <string.h>

#define STRING_BLOCK_SIZE 64
#define CHUNK_SIZE 32

/* ------------------------------------------------------------------------- */

static const char *err_bad_include = "cannot open include file";
static const char *err_include_too_deep = "include file nesting too deep";

/* ------------------------------------------------------------------------- */

static const char *__scanctx_add_filename(struct scan_context *ctx,
                                          char *filename)
{
  unsigned int count = ctx->num_filenames;
  char **f;

  for(f = ctx->filenames; count > 0; ++f, --count)
  {
    if(!strcmp(*f, filename))
    {
      free(filename);
      return(*f); /* already in list */
    }
  }

  if((ctx->num_filenames % CHUNK_SIZE) == 0)
  {
    ctx->filenames = realloc(ctx->filenames, (ctx->num_filenames + CHUNK_SIZE) * sizeof(char *));
  }

  ctx->filenames[ctx->num_filenames] = filename;
  ++ctx->num_filenames;
  return(filename);
}

/* ------------------------------------------------------------------------- */

void scanctx_init(struct scan_context *ctx, const char *top_filename)
{
  memset(ctx, 0, sizeof(struct scan_context));
  if(top_filename)
    ctx->top_filename = __scanctx_add_filename(ctx, strdup(top_filename));
}

/* ------------------------------------------------------------------------- */

char **scanctx_cleanup(struct scan_context *ctx,
                       unsigned int *num_filenames)
{
  int i;

  for(i = 0; i < ctx->depth; ++i)
    fclose(ctx->streams[i]);

  free((void *)(strbuf_release(&(ctx->string))));

  *num_filenames = ctx->num_filenames;
  return(ctx->filenames);
}

/* ------------------------------------------------------------------------- */

FILE *scanctx_push_include(struct scan_context *ctx, void *buffer,
                           const char **error)
{
  FILE *fp = NULL;
  char *file;
  char *full_file = NULL;

  *error = NULL;

  if(ctx->depth == MAX_INCLUDE_DEPTH)
  {
    *error = err_include_too_deep;
    return(NULL);
  }

  file = scanctx_take_string(ctx);
  if(ctx->config->include_dir)
  {
    full_file = (char *)malloc(strlen(ctx->config->include_dir) + strlen(file)
                               + 2);
    strcpy(full_file, ctx->config->include_dir);
    strcat(full_file, FILE_SEPARATOR);
    strcat(full_file, file);
  }

  fp = fopen(full_file ? full_file : file, "rt");
  free(full_file);

  if(fp)
  {
    ctx->streams[ctx->depth] = fp;
    ctx->files[ctx->depth] = __scanctx_add_filename(ctx, file);
    ctx->buffers[ctx->depth] = buffer;
    ++(ctx->depth);
  }
  else
  {
    free(file);
    *error = err_bad_include;
  }

  return(fp);
}

/* ------------------------------------------------------------------------- */

void *scanctx_pop_include(struct scan_context *ctx)
{
  void *buffer;

  if(ctx->depth == 0)
    return(NULL); /* stack underflow */

  --(ctx->depth);
  buffer = ctx->buffers[ctx->depth];
  fclose(ctx->streams[ctx->depth]);

  return(buffer);
}

/* ------------------------------------------------------------------------- */

char *scanctx_take_string(struct scan_context *ctx)
{
  char *r = strbuf_release(&(ctx->string));

  return(r ? r : strdup(""));
}

/* ------------------------------------------------------------------------- */

const char *scanctx_current_filename(struct scan_context *ctx)
{
  return((ctx->depth == 0) ? ctx->top_filename : ctx->files[ctx->depth - 1]);
}

/* ------------------------------------------------------------------------- */