surveysystem compare_session_line() tests

Makefile

CC=gcc
CFLAGS=-I. -Wall -pedantic -Werror -Wshadow -Wstrict-aliasing -Wstrict-overflow -g

all: main.o
	$(CC) -o main main.o

.PHONY: clean

clean:
	rm -f ./*.o ./main ./test_config

test_compare_session_line.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <assert.h>

void report_result(int res, char *session_line, char *comparison_line) {
  switch (res) {
    case 0:
      fprintf(stderr, "  \033[39m[\033[32mPASS\033[39m] (%d): \"%s\" == \"%s\"\n", res, session_line, comparison_line);
    break;
    case -1:
      fprintf(stderr, "  \033[39m[\033[31mMISMATCH\033[39m] (%d): \"%s\" != \"%s\"\n", res, session_line, comparison_line);
    case -2: 
      fprintf(stderr, "  \033[39m[\033[31mTOO SHORT\033[39m] (%d): \"%s\" != \"%s\"\n", res, session_line, comparison_line);
    break;
    case -3: 
      fprintf(stderr, "  \033[39m[\033[31mTOO LONG\033[39m] (%d): \"%s\" != \"%s\"\n", res, session_line, comparison_line);
    break;
    case -4: 
      fprintf(stderr, "  \033[39m[\033[31m<UTIME> INVALID\033[39m] (%d): \"%s\" != \"%s\"\n", res, session_line, comparison_line);
    break;
    default:
      fprintf(stderr, "  \033[39m[\033[31;1;5mUNKNOWN REUTURN CODE\033[39;0m] (%d): \"%s\" != \"%s\"\n", res, session_line, comparison_line);
  }
}


/**
 * Compares survey session line with a comparsion string
 * - the number of delimitors (Note, this includes escaped delimiters in fields, i.e "\:") 
 * - string matches between delimitors
 * - custom validation via <KEYWORDS>
 * Note that this function is not very practical in terms of deserializing lines due to ignoring escaped delimiters
 *  
 * Return values:
 *    0: OK, columns match
 *   -1: text compare error
 *   -2: session line too short (column count)
 *   -3: session line too long (column count)
 *   -4: session field <UTIME> is invalid (must be within the past hour from now)
 */
int compare_session_line(char *session_line, char *comparison_line) {
  // do not mutate arg strings
  char *left_line = strdup(session_line);
  char *right_line = strdup(comparison_line);
  
  char *left_ptr; 
  char *right_ptr;
  
  char *left = strtok_r(left_line, ":", &left_ptr);
  char *right = strtok_r(right_line, ":", &right_ptr);
  
  while(right) {
    
    // match number of columns: session line too short
    if(!left) {
      return -2;
    }
    
    // validate <UTIME> keyword (unix timestamp)
    if(!strcmp(right, "<UTIME>")) {
      int now = (int) time(NULL); 
      int then = atoi(left);
      
      if (now <= 0 || now < then || now - then > 8600) {
        return -4;
      } 
      
      return 0;
    } 
    
    // compare column text
    if(strcmp(left, right)) { 
      return -1;
    } 

    left = strtok_r(NULL, ":", &left_ptr);
    right = strtok_r(NULL, ":", &right_ptr);
    
  }
  
  // match number of columns: session line too long
  if (left) {
    return -3;
  }
  
  return 0;
}

int main() {
  int res;
  int now; 
  char *session_line;
  char *comparison_line;
  
  fprintf(stderr, "\nTesting column MISMATCH\n");
  session_line = strdup("question1:Hello World:0:0:0:0:0:0:0::0");
  comparison_line = strdup("0:Hello World:2:3:4:5:6:7:8:9:10");
  res = compare_session_line(session_line, comparison_line);
  report_result(res, session_line, comparison_line);
  assert(res == -1);
  
  fprintf(stderr, "\nTesting MATCH\n");
  session_line = strdup("question1:Hello World:0:0:0:0:0:0:0::0");
  comparison_line = strdup("question1:Hello World:0:0:0:0:0:0:0::0");
  res = compare_session_line(session_line, comparison_line);
  report_result(res, session_line, comparison_line);
  assert(res == 0);
  
  fprintf(stderr, "\nTesting column MISMATCH in FIRST COL\n");
  session_line = strdup("question1:Hello World:0:0:0:0:0:0:0::0");
  comparison_line = strdup("question2:Hello World:0:0:0:0:0:0:0::0");
  res = compare_session_line(session_line, comparison_line);
  report_result(res, session_line, comparison_line);
  assert(res == -1);
  
  fprintf(stderr, "\nTesting column MISMATCH in LAST col\n");
  session_line = strdup("question1:Hello World:0:0:0:0:0:0:0::1");
  comparison_line = strdup("question1:Hello World:0:0:0:0:0:0:0::0");
  res = compare_session_line(session_line, comparison_line);
  report_result(res, session_line, comparison_line);
  assert(res == -1);
  
  fprintf(stderr, "\nTesting MATCH with <UTIME>\n");
  now = (int) time(NULL); 
  snprintf (session_line, 8192, "question1:Hello World:0:0:0:0:0:0:0::%d", now - 60);
  comparison_line = strdup("question1:Hello World:0:0:0:0:0:0:0::<UTIME>");
  res = compare_session_line(session_line, comparison_line);
  report_result(res, session_line, comparison_line);
  assert(res == 0);
  
  fprintf(stderr, "\nTesting MATCH with INVALID <UTIME>\n");
  now = (int) time(NULL); 
  snprintf (session_line, 8192, "question1:Hello World:0:0:0:0:0:0:0::%d", now - 10000);
  comparison_line = strdup("question1:Hello World:0:0:0:0:0:0:0::<UTIME>");
  res = compare_session_line(session_line, comparison_line);
  report_result(res, session_line, comparison_line);
  assert(res == -4);
  
  fprintf(stderr, "\nTesting comparsion columns TOO SHORT\n");
  session_line = strdup("question2:Hello World:0:0:");
  comparison_line = strdup("question2:Hello World:0:0:0:0:0:0:0::0");
  res = compare_session_line(session_line, comparison_line);
  report_result(res, session_line, comparison_line);
  assert(res == -2);
  
  fprintf(stderr, "\nTesting comparsion columns TOO LONG\n");
  session_line = strdup("question2:Hello World:0:0:0:0:0:0:0::0:too long:");
  comparison_line = strdup("question2:Hello World:0:0:0:0:0:0:0::0");
  res = compare_session_line(session_line, comparison_line);
  report_result(res, session_line, comparison_line);
  assert(res == -3);
  
  fprintf(stderr, "\nTesting comparsion columns TOO SHORT: NO <UTIME> defined\n"); 
  session_line = strdup("question1:Hello World:0:0:0:0:0:0:0::");
  comparison_line = strdup("question1:Hello World:0:0:0:0:0:0:0::<UTIME>");
  res = compare_session_line(session_line, comparison_line);
  report_result(res, session_line, comparison_line);
  assert(res == -2);
  
  fprintf(stderr, "\n-------- END --------\n");
  return 0;
}