json_writer.c

/*
 SPDX-FileCopyrightText: © 2019 Siemens AG
 Author: Gaurav Mishra <mishra.gaurav@siemens.com>
 
 SPDX-License-Identifier: GPL-2.0-only
*/
 
#include "json_writer.h"
#include "nomos.h"
#include "nomos_utils.h"
#include <json-c/json.h>
 
void writeJson()
{
  char realPathOfTarget[PATH_MAX];
  json_object *result = json_object_new_object();
  json_object *licenses = json_object_new_array();
  json_object *fileLocation = NULL;
  json_object *aLicense = NULL;
  size_t i = 0;
 
  parseLicenseList();
  while (cur.licenseList[i] != NULL)
  {
    aLicense = json_object_new_string(cur.licenseList[i]);
    cur.licenseList[i] = NULL;
    json_object_array_add(licenses, aLicense);
    ++i;
  }
  if (optionIsSet(OPTS_LONG_CMD_OUTPUT)
      && realpath(cur.targetFile, realPathOfTarget))
  {
    fileLocation = json_object_new_string(realPathOfTarget);
  }
  else
  {
    fileLocation = json_object_new_string(basename(cur.targetFile));
  }
  json_object_object_add(result, "file", fileLocation);
  json_object_object_add(result, "licenses", licenses);
  char *prettyJson = unescapePathSeparator(
    json_object_to_json_string_ext(result, JSON_C_TO_STRING_PRETTY));
  sem_wait(mutexJson);
  if (*printcomma)
  {
    printf(",%s\n", prettyJson);
  }
  else
  {
    *printcomma = true;
    printf("%s\n", prettyJson);
  }
  fflush(stdout);
  sem_post(mutexJson);
  free(prettyJson);
  json_object_put(result);
}
 
char *unescapePathSeparator(const char* json)
{
  const char *escapedSeparator = "\\/";
  const char *pathSeparator = "/";
  const int escPathLen = 2;
  const int pathSepLen = 1;
  size_t resultLength = 0;
  size_t remainingLength = -1;
  char *result;
  char *tmp;
  char *tempjson;
  int count;
  if (!json)
  {
    return NULL;
  }
  tempjson = strdup(json);
 
  tmp = tempjson;
  for (count = 0; (tmp = strstr(tmp, escapedSeparator)); count++)
  {
    tmp += escPathLen;
  }
 
  resultLength = strlen(tempjson) - ((escPathLen - pathSepLen) * count);
 
  result = (char*) calloc(resultLength + 1, sizeof(char));
 
  strncpy(result, strtok(tempjson, escapedSeparator), resultLength);
  remainingLength = resultLength - strlen(result);
 
  while (count-- && remainingLength > 0)
  {
    strncat(result, pathSeparator, remainingLength);
    strncat(result, strtok(NULL, escapedSeparator), remainingLength - 1);
    remainingLength = resultLength - strlen(result);
  }
  free(tempjson);
  return result;
}
 
inline void initializeJson()
{
  mutexJson = (sem_t *) mmap(NULL, sizeof(sem_t),
    PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_SHARED, -1, 0);
  printcomma = (gboolean *) mmap(NULL, sizeof(gboolean),
    PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
  sem_init(mutexJson, 2, SEM_DEFAULT_VALUE);
}
 
inline void destroyJson()
{
  sem_destroy(mutexJson);
  munmap(printcomma, sizeof(gboolean));
  munmap(mutexJson, sizeof(sem_t));
}