size of file in c

If you have the file stream (FILE * f): fseek(f, 0, SEEK_END); // seek to end of file size = ftell(f); // get current file pointer fseek(f, 0, SEEK_SET); // seek back to beginning of file // proceed with allocating memory and reading the file Or, #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> fd = fileno(f); struct stat buf; fstat(fd, &buf); int size = buf.st_size; Or, use stat, if you know the filename: #include <sys/stat.h> struct stat st; stat(filename, &st); size = st.st_size;

If you use : /** Pay attention to return type! ftell returns long, which can only be used for files under 2GB. **/ fseek(f, 0, SEEK_END); // seek to end of file size = ftell(f); // get current file pointer fseek(f, 0, SEEK_SET); // seek back to beginning of file // If u want to get file of large size, use stat() instead struct stat buf; if(stat(filename, &buf) == -1){ return -1; } return (ssize_t)buf.st_size;

size of file in c

// C program to find the size of file 
#include <stdio.h> 

long int findSize(char file_name[]) 
{ 
	// opening the file in read mode 
	FILE* fp = fopen(file_name, "r"); 

	// checking if the file exist or not 
	if (fp == NULL) { 
		printf("File Not Found!\n"); 
		return -1; 
	} 

	fseek(fp, 0L, SEEK_END); 

	// calculating the size of the file 
	long int res = ftell(fp); 

	// closing the file 
	fclose(fp); 

	return res; 
} 

// Driver code 
int main() 
{ 
	char file_name[] = { "a.txt" }; 
	long int res = findSize(file_name); 
	if (res != -1) 
		printf("Size of the file is %ld bytes \n", res); 
	return 0; 
}

Posted by: Guest on September-24-2020

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