?? common.c
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#include <sys/types.h>#include <errno.h>//code from UNIX Network Programming by W.Richard Stevensssize_t readn(int fd, void *vptr, size_t n){ ssize_t nleft, nread; char *ptr; ptr = vptr; nleft = n; while(nleft > 0){ if( (nread = read(fd, ptr, nleft)) < 0 ){ if(errno == EINTR) nread = 0; else return -1; } else if(nread == 0) break; //EOF nleft -= nread; ptr += nread; } return (n - nleft);}ssize_t writen(int fd, void *vptr, size_t n){ size_t nleft, nwritten; char *ptr; ptr = vptr; nleft = n; while(nleft > 0){ if( (nwritten = write(fd, ptr, nleft)) <=0 ){ if(errno == EINTR) nwritten = 0; else return -1; //error } nleft -= nwritten; ptr += nwritten; } return n;}ssize_t readline(int fd, void *vptr, size_t maxlen){ ssize_t n, rc; char c, *ptr; ptr = vptr; for(n = 1; n < maxlen; n++){ again: if( (rc = read(fd, &c, 1)) == 1){ *ptr++ = c; if(c == '\n') break; //readover } else if(rc == 0){ if(n == 1) return 0; //EOF no data read else break; //EOF some data read } else { if(errno == EINTR) goto again; return -1; //error } } *ptr = 0; return n;}
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