lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
| 2 | /* |
| 3 | * Utility routines. |
| 4 | * |
| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org> |
| 6 | * |
| 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| 8 | */ |
| 9 | |
| 10 | #include "libbb.h" |
| 11 | |
| 12 | FILE* FAST_FUNC fopen_or_warn(const char *path, const char *mode) |
| 13 | { |
| 14 | FILE *fp = fopen(path, mode); |
| 15 | if (!fp) { |
| 16 | bb_simple_perror_msg(path); |
| 17 | //errno = 0; /* why? */ |
| 18 | } |
| 19 | return fp; |
| 20 | } |
| 21 | |
| 22 | FILE* FAST_FUNC fopen_for_read(const char *path) |
| 23 | { |
| 24 | return fopen(path, "r"); |
| 25 | } |
| 26 | |
| 27 | FILE* FAST_FUNC xfopen_for_read(const char *path) |
| 28 | { |
| 29 | return xfopen(path, "r"); |
| 30 | } |
| 31 | |
| 32 | FILE* FAST_FUNC fopen_for_write(const char *path) |
| 33 | { |
| 34 | return fopen(path, "w"); |
| 35 | } |
| 36 | |
| 37 | FILE* FAST_FUNC xfopen_for_write(const char *path) |
| 38 | { |
| 39 | return xfopen(path, "w"); |
| 40 | } |
| 41 | |
| 42 | static FILE* xfdopen_helper(unsigned fd_and_rw_bit) |
| 43 | { |
| 44 | FILE* fp = fdopen(fd_and_rw_bit >> 1, fd_and_rw_bit & 1 ? "w" : "r"); |
| 45 | if (!fp) |
| 46 | bb_error_msg_and_die(bb_msg_memory_exhausted); |
| 47 | return fp; |
| 48 | } |
| 49 | FILE* FAST_FUNC xfdopen_for_read(int fd) |
| 50 | { |
| 51 | return xfdopen_helper(fd << 1); |
| 52 | } |
| 53 | FILE* FAST_FUNC xfdopen_for_write(int fd) |
| 54 | { |
| 55 | return xfdopen_helper((fd << 1) + 1); |
| 56 | } |