getline

getline.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>


ssize_t getline(char **restrict lineptr, size_t *restrict n,
		FILE *restrict stream) {

	register char c;
	register char *cs = NULL;
	register int length = 0;
	while ((c = getc(stream)) != EOF) {
		cs = (char *)realloc(cs, ++length + 1);
		if ((*(cs + length - 1) = c) == '\n') {
			*(cs + length) = '\0';
			break;
		}
	}

	// return the allocated memory if lineptr is null
	if ((*lineptr) == NULL) {
		*lineptr = cs;
	} 
	else {
		// check if enough memory is allocated 
		if ((length + 1) < *n) {
			*lineptr = (char *)realloc(*lineptr, length + 1);
		}
		memcpy(*lineptr, cs, length);
		free(cs);
	}
	return (ssize_t)(*n = strlen(*lineptr));
}