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Diffstat (limited to '')
| -rw-r--r-- | lib/scanctx.c | 171 |
1 files changed, 171 insertions, 0 deletions
diff --git a/lib/scanctx.c b/lib/scanctx.c new file mode 100644 index 0000000..f287fdf --- /dev/null +++ b/lib/scanctx.c @@ -0,0 +1,171 @@ +/* ---------------------------------------------------------------------------- + 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 */ |