source: trunk/minix/commands/pax/fgetln.c@ 15

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char *
fgetln(FILE *fp, size_t *lenp)
{
#define EXTRA 80
        char *buf = NULL;
        int used = 0, len = 0, remain = 0, final = 0;
        while(!final) {
                char *b;
                int r;
                if(remain < EXTRA) {
                        int newlen;
                        char *newbuf;
                        newlen = len + EXTRA;
                        if(!(newbuf = realloc(buf, newlen))) {
                                if(buf) free(buf);
                                return NULL;
                        }
                        buf = newbuf;
                        len = newlen;
                        remain += EXTRA;
                }
                buf[used] = '\0';
                if(!fgets(buf + used, remain, fp))
                        break;
                r = strlen(buf+used);
                used += r;
                remain -= r;
                len += r;
        }
        *lenp = len;
        return buf;
}