1 | #include "stdio_impl.h"
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2 | #include <stdlib.h>
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3 | #include <sys/ioctl.h>
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4 | #include <fcntl.h>
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5 | #include <errno.h>
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6 | #include <string.h>
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7 |
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8 | FILE *__fdopen(int fd, const char *mode)
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9 | {
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10 | FILE *f;
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11 | struct winsize wsz;
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12 |
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13 | /* Check for valid initial mode character */
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14 | if (!strchr("rwa", *mode)) {
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15 | errno = EINVAL;
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16 | return 0;
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17 | }
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18 |
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19 | /* Allocate FILE+buffer or fail */
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20 | if (!(f=malloc(sizeof *f + UNGET + BUFSIZ))) return 0;
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21 |
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22 | /* Zero-fill only the struct, not the buffer */
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23 | memset(f, 0, sizeof *f);
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24 |
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25 | /* Impose mode restrictions */
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26 | if (!strchr(mode, '+')) f->flags = (*mode == 'r') ? F_NOWR : F_NORD;
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27 |
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28 | /* Apply close-on-exec flag */
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29 | if (strchr(mode, 'e')) __syscall(SYS_fcntl, fd, F_SETFD, FD_CLOEXEC);
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30 |
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31 | /* Set append mode on fd if opened for append */
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32 | if (*mode == 'a') {
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33 | int flags = __syscall(SYS_fcntl, fd, F_GETFL);
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34 | if (!(flags & O_APPEND))
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35 | __syscall(SYS_fcntl, fd, F_SETFL, flags | O_APPEND);
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36 | f->flags |= F_APP;
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37 | }
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38 |
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39 | f->fd = fd;
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40 | f->buf = (unsigned char *)f + sizeof *f + UNGET;
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41 | f->buf_size = BUFSIZ;
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42 |
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43 | /* Activate line buffered mode for terminals */
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44 | f->lbf = EOF;
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45 | if (!(f->flags & F_NOWR) && !__syscall(SYS_ioctl, fd, TIOCGWINSZ, &wsz))
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46 | f->lbf = '\n';
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47 |
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48 | /* Initialize op ptrs. No problem if some are unneeded. */
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49 | f->read = __stdio_read;
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50 | f->write = __stdio_write;
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51 | f->seek = __stdio_seek;
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52 | f->close = __stdio_close;
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53 |
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54 | if (!libc.threaded) f->lock = -1;
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55 |
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56 | /* Add new FILE to open file list */
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57 | return __ofl_add(f);
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58 | }
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59 |
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60 | weak_alias(__fdopen, fdopen);
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