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/* ----------------------------------------------------------------------------
libconfig - A library for processing structured configuration files
Copyright (C) 2005-2010 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 Lesser General Public License
as published by the Free Software Foundation; either version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Library 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,
const char *filename)
{
unsigned int count = ctx->num_filenames;
const char **f;
for(f = ctx->filenames; count > 0; ++f, --count)
{
if(!strcmp(*f, filename))
{
free((void *)filename);
return(*f); /* already in list */
}
}
if((ctx->num_filenames % CHUNK_SIZE) == 0)
{
ctx->filenames = (const char **)realloc(
(void *)ctx->filenames,
(ctx->num_filenames + CHUNK_SIZE) * sizeof(const 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));
}
/* ------------------------------------------------------------------------- */
const 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;
const 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((void *)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((void *)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]);
}
/* ------------------------------------------------------------------------- */
/* eof */
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