?? readn.c
字號:
#include "apue.h"ssize_t /* Read "n" bytes from a descriptor */readn(int fd, void *ptr, size_t n){ size_t nleft; ssize_t nread; nleft = n; while (nleft > 0) { if ((nread = read(fd, ptr, nleft)) < 0) { if (nleft == n) return(-1); /* error, return -1 */ else break; /* error, return amount read so far */ } else if (nread == 0) { break; /* EOF */ } nleft -= nread; ptr += nread; } return(n - nleft); /* return >= 0 */}
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