f14.c by cata

/*
 * F14. (3 puncte) Scrieti un program care numara aparitiile unui string
 * intr-un fisier dat. Stringul si specificatorul fisierului sunt dati ca
 * argumente in linia de comanda.
 */


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int stringLen(FILE *f)
{
	size_t pos = ftell(f);    // Current position
 	fseek(f, 0, SEEK_END);    // Go to end
	size_t length = ftell(f); // read the position which is the size
 	fseek(f, pos, SEEK_SET);  // restore original position
	return length;
}

int main(int argc, char **argv)
{
	FILE *input;

	char *string;

	int tempWord;
	int wordLen;
	int appearance;
	int fs;
	int chars;
	int stringFileLen;

	//We check if we do not have 3 arguments
	if(argc != 3)
	{
		fprintf(stderr, "Three arguments required!\nUse: %s word file\n", argv[0]);
		return 1;
	}

	//If we have 3 arguments, it's oK

		tempWord = strlen(argv[1]);
		wordLen = strlen(argv[1]);

		//if word is null, then stop
		if(!wordLen)
		{
			fprintf(stderr, "The second argument is NULL.\n A word with a minimum of length of 1 is required.\n");
			return 1;
		}

		//if word is not null, it's ok
			input = fopen(argv[2], "r");

			//We check if the file works
			if(input == NULL)
			{
				perror(argv[2]);
				return 1;
			}

				stringFileLen = stringLen(input);
				printf("MARIME: %d\n", stringFileLen);
				//We allocate memory to string, which is equal to the length of argv[1]
				string = (malloc((sizeof(char)*(wordLen + 1))));

				if(string == NULL)
				{
					perror("malloc");
					fclose(input);
					return 1;
				}
					appearance = 0;
					chars = 0;
					while(tempWord == wordLen)
					{
						if((chars + wordLen) <= stringFileLen)
						{

							//We read every wordLen string of input and place it on the tempWord
							tempWord = fread(string, sizeof(char), wordLen, input);

							if(ferror(input))
							{
								perror(argv[2]);
								fclose(input);
								return 1;
							}

								string[wordLen] = '\0';
								if(strcmp(string, argv[1]) == 0)
									appearance++;
								fs = fseek(input, 1 - wordLen, SEEK_CUR);
								chars++;

								if(fs == -1)
								{
									fprintf(stderr, "Searching Error...\n");
									fclose(input);
									return 1;
								}

						}
						else
							break;
					}
					if(appearance < 1) fprintf(stdout, "The %s word does not belong to the file %s.\n", argv[1], argv[2]);
					else
					{
						if(appearance == 1) fprintf(stdout, "The %s word appears only once in the file %s.\n", argv[1], argv[2]);
						else fprintf(stdout, "The %s word appears %d times in the file %s.\n", argv[1], appearance, argv[2]);
					}

	return 0;
}