| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | #include <errno.h> | ||
| 2 | #include <limits.h> | ||
| 3 | #include <stdlib.h> | ||
| 4 | #include <sys/stat.h> | ||
| 5 | #include "readfile.h" | ||
| 6 | #include "xreadwrite.h" | ||
| 7 | |||
| 8 | // Read the contents of a file into memory, if smaller than `size_limit` | ||
| 9 | 204 | ssize_t read_file(const char *filename, char **bufp, size_t size_limit) | |
| 10 | { | ||
| 11 | 204 | int fd = xopen(filename, O_RDONLY | O_CLOEXEC, 0); | |
| 12 |
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204 | if (fd == -1) { |
| 13 | 64 | goto error_noclose; | |
| 14 | } | ||
| 15 | |||
| 16 | 140 | int saved_errno; | |
| 17 | 140 | struct stat st; | |
| 18 |
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140 | if (unlikely(fstat(fd, &st) == -1)) { |
| 19 | ✗ | goto error; | |
| 20 | } | ||
| 21 |
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140 | if (unlikely(S_ISDIR(st.st_mode))) { |
| 22 | 1 | errno = EISDIR; | |
| 23 | 1 | goto error; | |
| 24 | } | ||
| 25 | |||
| 26 | 139 | off_t size = st.st_size; | |
| 27 |
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139 | size_limit = size_limit ? MIN(size_limit, SSIZE_MAX) : SSIZE_MAX; |
| 28 |
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139 | if (unlikely(size > size_limit)) { |
| 29 | 1 | errno = EFBIG; | |
| 30 | 1 | goto error; | |
| 31 | } | ||
| 32 | |||
| 33 | 138 | char *buf = malloc(size + 1); | |
| 34 |
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138 | if (unlikely(!buf)) { |
| 35 | ✗ | goto error; | |
| 36 | } | ||
| 37 | |||
| 38 | 138 | ssize_t r = xread_all(fd, buf, size); | |
| 39 |
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138 | if (unlikely(r < 0)) { |
| 40 | ✗ | free(buf); | |
| 41 | ✗ | goto error; | |
| 42 | } | ||
| 43 | |||
| 44 | 138 | buf[r] = '\0'; | |
| 45 | 138 | *bufp = buf; | |
| 46 | 138 | xclose(fd); | |
| 47 | 138 | return r; | |
| 48 | |||
| 49 | 2 | error: | |
| 50 | 2 | saved_errno = errno; | |
| 51 | 2 | xclose(fd); | |
| 52 | 2 | errno = saved_errno; | |
| 53 | 66 | error_noclose: | |
| 54 | 66 | *bufp = NULL; | |
| 55 | 66 | return -1; | |
| 56 | } | ||
| 57 |