108 lines
2.9 KiB
C
108 lines
2.9 KiB
C
/*
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* SPDX-License-Identifier: ISC
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*
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* Copyright (C) 2018 Michael Drake <tlsa@netsurf-browser.org>
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <cyaml/cyaml.h>
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/******************************************************************************
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* C data structure for storing a project plan.
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*
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* This is what we want to load the YAML into.
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******************************************************************************/
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/* Structure for storing numerical sequence */
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struct numbers {
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char *name;
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int *data;
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unsigned data_count;
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};
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/******************************************************************************
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* CYAML schema to tell libcyaml about both expected YAML and data structure.
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*
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* (Our CYAML schema is just a bunch of static const data.)
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******************************************************************************/
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/* CYAML value schema for entries of the data sequence. */
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static const cyaml_schema_value_t data_entry = {
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CYAML_VALUE_INT(CYAML_FLAG_DEFAULT, int),
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};
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/* CYAML mapping schema fields array for the top level mapping. */
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static const cyaml_schema_field_t top_mapping_schema[] = {
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CYAML_FIELD_STRING_PTR("name", CYAML_FLAG_POINTER,
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struct numbers, name,
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0, CYAML_UNLIMITED),
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CYAML_FIELD_SEQUENCE("data", CYAML_FLAG_POINTER,
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struct numbers, data, &data_entry,
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0, CYAML_UNLIMITED),
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CYAML_FIELD_END
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};
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/* CYAML value schema for the top level mapping. */
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static const cyaml_schema_value_t top_schema = {
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CYAML_VALUE_MAPPING(CYAML_FLAG_POINTER,
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struct numbers, top_mapping_schema),
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};
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/******************************************************************************
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* Actual code to load and save YAML doc using libcyaml.
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******************************************************************************/
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/* Our CYAML config.
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*
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* If you want to change it between calls, don't make it const.
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*
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* Here we have a very basic config.
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*/
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static const cyaml_config_t config = {
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.log_fn = cyaml_log, /* Use the default logging function. */
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.mem_fn = cyaml_mem, /* Use the default memory allocator. */
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.log_level = CYAML_LOG_WARNING, /* Logging errors and warnings only. */
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};
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/* Main entry point from OS. */
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int main(int argc, char *argv[])
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{
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cyaml_err_t err;
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struct numbers *n;
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enum {
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ARG_PROG_NAME,
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ARG_PATH_IN,
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ARG__COUNT,
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};
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/* Handle args */
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if (argc != ARG__COUNT) {
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fprintf(stderr, "Usage:\n");
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fprintf(stderr, " %s <INPUT>\n", argv[ARG_PROG_NAME]);
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return EXIT_FAILURE;
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}
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/* Load input file. */
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err = cyaml_load_file(argv[ARG_PATH_IN], &config,
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&top_schema, (cyaml_data_t **)&n, NULL);
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if (err != CYAML_OK) {
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fprintf(stderr, "ERROR: %s\n", cyaml_strerror(err));
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return EXIT_FAILURE;
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}
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/* Use the data. */
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printf("%s:\n", n->name);
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for (unsigned i = 0; i < n->data_count; i++) {
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printf(" - %i\n", n->data[i]);
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}
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/* Free the data */
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cyaml_free(&config, &top_schema, n, 0);
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return EXIT_SUCCESS;
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}
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