It decrements the pointer by 68 since array elements

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Unformatted text preview: size_t maxlen) { int n, rc; char c, *ptr = buf; for (n = 1; n < maxlen; n++) { /* notice that loop starts at 1 */ if ( (rc = my_read(fd, &c)) == 1) { *ptr++ = c; if (c == ’\n’) break; /* newline is stored, like fgets() */ } else if (rc == 0) { if (n == 1) return 0; /* EOF, no data read */ else break; /* EOF, some data was read */ } else return -1; /* error, errno set by read() */ } *ptr = 0; /* null terminate like fgets() */ return n; 688 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 APPENDIX A. ERROR HANDLING } /* * readline_r: Stevens’s reentrant readline package * (mentioned but not defined in UNP 23.5) */ static ssize_t my_read_r(Rline *rptr, char *ptr) { if (rptr->rl_cnt <= 0) { again: rptr->rl_cnt = read(rptr->read_fd, rptr->rl_buf, sizeof(rptr->rl_buf)); if (rptr->rl_cnt < 0) { if (errno == EINTR) goto again; else re...
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This note was uploaded on 09/02/2010 for the course ELECTRICAL 360 taught by Professor Schultz during the Spring '10 term at BYU.

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