C - Get all files and their last modified date recursively

recursive_list_files.c

// A c program to search all files recursively from the executable's path and retrieve its relative filename and last modified date.

// Similar to 'ls' command on linux

/* Sample output:
This directory tree has 3 files:
2017-12-05 23:55:39 ./src/recursive_file_list.c
2017-12-05 23:52:17 ./recursive_file_list.exe
2017-12-05 23:51:17 ./tools/windows/compile.bat
*/

// Tested on windows 7

#include <stdio.h>
#include <string.h>
#include <dirent.h> // directory reader
#include <sys/types.h> // unused error types
#include <sys/stat.h> // file reader
#include <time.h> //ctime

#define MAX_FILE_NAME_LENGTH	256
#define MAX_FILE_CHECK	256

typedef struct file_data_t {
	char fileName[MAX_FILE_NAME_LENGTH];
	char lastModified[32];
} file_data_t;

file_data_t fileData[MAX_FILE_CHECK];
int fileCount = 0;
int exceededFileLimit = 0;

void add_to_real_data(char * fileName, char * lastModified) {
	if (fileCount < MAX_FILE_CHECK) {
		snprintf(fileData[fileCount].fileName, MAX_FILE_NAME_LENGTH, "%s", fileName);
		snprintf(fileData[fileCount].lastModified, 32, "%s", lastModified);
		int i;
		for (i=0;i<32 && fileData[fileCount].lastModified[i] != '\0';i++)
			if (fileData[fileCount].lastModified[i] == '\n')
				fileData[fileCount].lastModified[i] = '\0';
		fileCount++;
	} else {
		exceededFileLimit = 1;
	}
}

int is_directory(struct stat * b) {
	return !S_ISREG(b->st_mode);
}

int string_equal(char * a, char * b) {
	return (strcmp(a,b) == 0);
}

void recursive_parse_directory(char * name) {
	//printf("scanning %s\n", name);
	DIR *d;
	struct stat file_status;
	struct dirent * dir;
	char fullFilePath[MAX_FILE_NAME_LENGTH];
	d = opendir(name);
	if (d) {
		while (((dir = readdir(d)) != NULL) && (exceededFileLimit == 0)) {
			snprintf(fullFilePath, MAX_FILE_NAME_LENGTH, "%s/%s", name, dir->d_name);
			if (dir->d_name[0] != '.' && !string_equal(dir->d_name, "file_index.txt") && stat(fullFilePath, &file_status) == 0) {
				if (is_directory(&file_status)) {
					recursive_parse_directory(fullFilePath);
				} else {
					char time_buffer[32];
					strftime(time_buffer, 26, "%Y-%m-%d %H:%M:%S", localtime(&file_status.st_mtime));
					add_to_real_data(fullFilePath, time_buffer);
				}
			} else {
			}
		}
		closedir(d);
	}
}

int main(void) {
	recursive_parse_directory(".");
	if (exceededFileLimit == 1) {
		printf("Exceeded maximum file searching of %d files.", MAX_FILE_CHECK);
	}
	printf("This directory tree has %d files:\n", fileCount);
	int i;
	for (i=0;i<fileCount;i++) {
		printf("%s %s\n", fileData[i].lastModified, fileData[i].fileName);
  }
    return(0);
}