| 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Copyright (C) 1999-2005 by Erik Andersen <andersen@codepoet.org>
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| 6 | *
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| 7 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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| 8 | */
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| 9 |
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| 10 | #include "libbb.h"
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| 11 |
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| 12 | #if BUFSIZ < 4096
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| 13 | #undef BUFSIZ
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| 14 | #define BUFSIZ 4096
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| 15 | #endif
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| 16 |
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| 17 | /* Used by NOFORK applets (e.g. cat) - must not use xmalloc */
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| 18 |
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| 19 | static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size)
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| 20 | {
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| 21 | int status = -1;
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| 22 | off_t total = 0;
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| 23 | char buffer[BUFSIZ];
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| 24 |
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| 25 | if (src_fd < 0)
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| 26 | goto out;
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| 27 |
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| 28 | if (!size) {
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| 29 | size = BUFSIZ;
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| 30 | status = 1; /* copy until eof */
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| 31 | }
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| 32 |
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| 33 | while (1) {
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| 34 | ssize_t rd;
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| 35 |
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| 36 | rd = safe_read(src_fd, buffer, size > BUFSIZ ? BUFSIZ : size);
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| 37 |
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| 38 | if (!rd) { /* eof - all done */
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| 39 | status = 0;
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| 40 | break;
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| 41 | }
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| 42 | if (rd < 0) {
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| 43 | bb_perror_msg(bb_msg_read_error);
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| 44 | break;
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| 45 | }
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| 46 | /* dst_fd == -1 is a fake, else... */
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| 47 | if (dst_fd >= 0) {
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| 48 | ssize_t wr = full_write(dst_fd, buffer, rd);
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| 49 | if (wr < rd) {
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| 50 | bb_perror_msg(bb_msg_write_error);
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| 51 | break;
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| 52 | }
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| 53 | }
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| 54 | total += rd;
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| 55 | if (status < 0) { /* if we aren't copying till EOF... */
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| 56 | size -= rd;
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| 57 | if (!size) {
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| 58 | /* 'size' bytes copied - all done */
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| 59 | status = 0;
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| 60 | break;
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| 61 | }
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| 62 | }
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| 63 | }
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| 64 | out:
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| 65 | return status ? -1 : total;
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| 66 | }
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| 67 |
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| 68 |
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| 69 | #if 0
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| 70 | void complain_copyfd_and_die(off_t sz)
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| 71 | {
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| 72 | if (sz != -1)
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| 73 | bb_error_msg_and_die("short read");
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| 74 | /* if sz == -1, bb_copyfd_XX already complained */
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| 75 | xfunc_die();
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| 76 | }
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| 77 | #endif
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| 78 |
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| 79 | off_t bb_copyfd_size(int fd1, int fd2, off_t size)
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| 80 | {
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| 81 | if (size) {
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| 82 | return bb_full_fd_action(fd1, fd2, size);
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| 83 | }
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| 84 | return 0;
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| 85 | }
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| 86 |
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| 87 | void bb_copyfd_exact_size(int fd1, int fd2, off_t size)
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| 88 | {
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| 89 | off_t sz = bb_copyfd_size(fd1, fd2, size);
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| 90 | if (sz == size)
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| 91 | return;
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| 92 | if (sz != -1)
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| 93 | bb_error_msg_and_die("short read");
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| 94 | /* if sz == -1, bb_copyfd_XX already complained */
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| 95 | xfunc_die();
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| 96 | }
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| 97 |
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| 98 | off_t bb_copyfd_eof(int fd1, int fd2)
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| 99 | {
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| 100 | return bb_full_fd_action(fd1, fd2, 0);
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| 101 | }
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