search_word.c

#include <stdio.h>
#include <errno.h>
#include <stdlib.h>

#define ERROR -1
#define BUFFER_SIZE 100*10
#define NO_KEYWORD_FOUND -1
#define KEYWORD_ONE_FOUND_FIRST 1
#define KEYWORD_TWO_FOUND_FIRST 2


int parseFile(char* file_name)
{
    int return_value = ERROR;
    FILE* file_pointer =0;
    char* buffer =0;

    if(file_name != NULL)
    {
        if(file_pointer = fopen(file_name,"r"))
        {
            if(buffer=malloc(BUFFER_SIZE))
            {
                return_value = NO_KEYWORD_FOUND;
                while (fgets(buffer, BUFFER_SIZE, file_pointer)!=NULL)
                {
                    if(strcmp("KEYWORD_ONE\n", buffer)==0)
                    {
                        return_value = KEYWORD_ONE_FOUND_FIRST;
                        break;
                    }
                    if(strcmp("KEYWORD_TWO\n", buffer)==0)
                    {
                        return_value = KEYWORD_TWO_FOUND_FIRST;
                        break;
                    }
                }
                free(buffer);
            }
            fclose(file_pointer);
        }
    }
    return return_value;
}