bootstrap/src/parser.c

70 lines
1.6 KiB
C

#include "parser.h"
#include <assert.h>
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include "path.h"
static struct Error *find_spec_json(
const struct Config *const config, FILE **handle
) {
const char *segments[] = {config->root_dir, config->target, "spec.json"};
char *filepath =
join_path_segments(sizeof(segments) / sizeof(char *), segments);
struct Error *error = 0;
// It is ok if the file does not exist. It is not ok if we couldn't open the
// file for any other reason.
*handle = fopen(filepath, "r");
if (!*handle && errno != ENOENT) {
error = ERROR_NEW(
ERROR_PARSER_SPEC_JSON_INVALID, config->target, "/spec.json is invalid."
);
}
free(filepath);
return error;
}
struct Error *parse_spec_json(
const struct Config *const config, cJSON **parsed
) {
FILE *handle = 0;
struct Error *error = find_spec_json(config, &handle);
if (error) {
return error;
}
// The `spec.json` file does not exist.
if (!handle) {
*parsed = 0;
return 0;
}
// For simplicity, load the entire file into memory.
fseek(handle, 0, SEEK_END);
size_t file_size = ftell(handle);
fseek(handle, 0, SEEK_SET);
char *fcontent = malloc(file_size);
size_t read_count = fread(fcontent, 1, file_size, handle);
assert(read_count == file_size);
*parsed = cJSON_Parse(fcontent);
free(fcontent);
fclose(handle);
// Can use `cJSON_GetErrorPtr()` to get the actual error message.
if (!*parsed) {
return ERROR_NEW(
ERROR_PARSER_SPEC_JSON_INVALID_SYNTAX,
"The spec.json file contains invalid JSON."
);
}
return 0;
}