diff options
Diffstat (limited to 'lib/scanctx.c')
| -rw-r--r-- | lib/scanctx.c | 198 |
1 files changed, 198 insertions, 0 deletions
diff --git a/lib/scanctx.c b/lib/scanctx.c new file mode 100644 index 0000000..02130ab --- /dev/null +++ b/lib/scanctx.c @@ -0,0 +1,198 @@ +/* ---------------------------------------------------------------------------- + libconfig - A library for processing structured configuration files + Copyright (C) 2005-2020 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 "strvec.h" +#include "wincompat.h" +#include "util.h" + +#include <stddef.h> +#include <stdlib.h> +#include <string.h> + +/* ------------------------------------------------------------------------- */ + +static const char *err_bad_include = "cannot open include file"; +static const char *err_include_too_deep = "include file nesting too deep"; + +/* ------------------------------------------------------------------------- */ + +void libconfig_scanctx_init(struct scan_context *ctx, const char *top_filename) +{ + __zero(ctx); + if(top_filename) + { + ctx->top_filename = strdup(top_filename); + libconfig_strvec_append(&(ctx->filenames), ctx->top_filename); + } +} + +/* ------------------------------------------------------------------------- */ + +const char **libconfig_scanctx_cleanup(struct scan_context *ctx) +{ + int i; + + for(i = 0; i < ctx->stack_depth; ++i) + { + struct include_stack_frame *frame = &(ctx->include_stack[i]); + + if(frame->current_stream) + fclose(frame->current_stream); + + __delete(frame->files); + } + + __delete(libconfig_strbuf_release(&(ctx->string))); + + return(libconfig_strvec_release(&(ctx->filenames))); +} + +/* ------------------------------------------------------------------------- */ + +FILE *libconfig_scanctx_push_include(struct scan_context *ctx, void *prev_buffer, + const char *path, const char **error) +{ + struct include_stack_frame *frame; + const char **files = NULL, **f; + FILE *fp; + + if(ctx->stack_depth == MAX_INCLUDE_DEPTH) + { + *error = err_include_too_deep; + return(NULL); + } + + *error = NULL; + + if(ctx->config->include_fn) + files = ctx->config->include_fn(ctx->config, ctx->config->include_dir, + path, error); + + if(*error || !files) + { + libconfig_strvec_delete(files); + return(NULL); + } + + if(!*files) + { + libconfig_strvec_delete(files); + return(NULL); + } + + frame = &(ctx->include_stack[ctx->stack_depth]); + + for(f = files; *f; ++f) + libconfig_strvec_append(&(ctx->filenames), *f); + + frame->files = files; + frame->current_file = NULL; + frame->current_stream = NULL; + frame->parent_buffer = prev_buffer; + ++(ctx->stack_depth); + + fp = libconfig_scanctx_next_include_file(ctx, error); + if(!fp) + (void)libconfig_scanctx_pop_include(ctx); + + return(fp); +} + +/* ------------------------------------------------------------------------- */ + +FILE *libconfig_scanctx_next_include_file(struct scan_context *ctx, + const char **error) +{ + struct include_stack_frame *include_frame; + + *error = NULL; + + if(ctx->stack_depth == 0) + return(NULL); + + include_frame = &(ctx->include_stack[ctx->stack_depth - 1]); + + if(include_frame->current_file) + ++(include_frame->current_file); + else + include_frame->current_file = include_frame->files; + + if(include_frame->current_stream) + { + fclose(include_frame->current_stream); + include_frame->current_stream = NULL; + } + + if(!*(include_frame->current_file)) + return(NULL); + + include_frame->current_stream = fopen(*(include_frame->current_file), "rt"); + if(!include_frame->current_stream) + *error = err_bad_include; + + return(include_frame->current_stream); +} + +/* ------------------------------------------------------------------------- */ + +void *libconfig_scanctx_pop_include(struct scan_context *ctx) +{ + struct include_stack_frame *frame; + + if(ctx->stack_depth == 0) + return(NULL); /* stack underflow */ + + frame = &(ctx->include_stack[--(ctx->stack_depth)]); + + __delete(frame->files); + frame->files = NULL; + + if(frame->current_stream) + { + fclose(frame->current_stream); + frame->current_stream = NULL; + } + + return(frame->parent_buffer); +} + +/* ------------------------------------------------------------------------- */ + +char *libconfig_scanctx_take_string(struct scan_context *ctx) +{ + char *r = libconfig_strbuf_release(&(ctx->string)); + + return(r ? r : strdup("")); +} + +/* ------------------------------------------------------------------------- */ + +const char *libconfig_scanctx_current_filename(struct scan_context *ctx) +{ + if(ctx->stack_depth > 0) + return(*(ctx->include_stack[ctx->stack_depth - 1].current_file)); + + return(ctx->top_filename); +} + +/* ------------------------------------------------------------------------- */ |