print_data_from_multiple_files.c

#include<stdio.h>
#include<string.h>
#include<ctype.h>
#include<stdlib.h>
#include<unistd.h>
#include<sys/types.h>
#include<sys/stat.h>
#include<sys/dir.h>
#include<dirent.h>
#include<fcntl.h>

void printInFile(char *file, char *buff)
{
	int fis = open(file, O_WRONLY | O_APPEND);
	if(fis == -1)
	{
		printf("Error on printfile open\n");
		exit(1);
	}
	write(fis,buff,strlen(buff));

	close(fis);
}

void readFile(char* file, char *buff)
{
	int fis = open(file, O_RDONLY);
	if(fis == -1)
	{
		perror("Error on readfile open!\n");
		exit(1);
	}

	int myRead;
	int nspaces=0, ndigits=0;

	while((myRead = read(fis, buff, 100)) > 0)
	{
		int i;
		for(i=0;i<myRead;i++)
		{
			if(buff[i] == ' ')
				nspaces++;

			if(isdigit(buff[i]))
				ndigits++;
		}
	}

	char str[100];
	sprintf(str," has %d spaces, %d digits.\n",nspaces,ndigits);
	printInFile("output.txt",str);

	close(fis);
}

void getDataFromDir(char *dirName)
{
	char buff[100];
	char Path[100];
	DIR *dir;
	struct stat fileStat;
	struct dirent *entry;

	dir = opendir(dirName);
	if(dir==NULL)
	{
		perror("opendir");
		exit(1);
	}

	while( (entry = readdir(dir)) !=NULL)
	{
		//printf("%s\n",entry->d_name);

		if( (strcmp(entry->d_name,".") == 0) || (strcmp(entry->d_name,"..") ==0) )
			continue;

		sprintf(Path,"%s/%s",dirName, entry->d_name);

		if((stat(Path,&fileStat)) == 0)//ok
		{
			printf("Calea fis este: %s\n",Path);

			if(S_ISREG(fileStat.st_mode))
			{
				//printf("Fisierul: %s\n\n",entry->d_name);
				sprintf(buff, "%s ", Path);
				printInFile("output.txt", buff);
				readFile(Path, buff);
			}

			if(S_ISDIR(fileStat.st_mode))
			{
				getDataFromDir(Path);
			}
		}
	}

}

int main(int argc, char *argv[])
{
	if(argc < 2)
	{
		printf("Error, correct usage: directory_name output_file_name\n");
		exit(1);
	}

	 getDataFromDir(argv[1]);

	return 0;
}