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annotate lib/portability.h @ 549:1f5bd8c93093

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Implement Apple and Android versions of getline(), getdelim(), and clearenv().
author Georgi Chorbadzhiyski <gf@unixsol.org>
date Fri, 16 Mar 2012 06:42:08 -0500
parents 31215cc6c9f2
children b2194045c40e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 // The tendency of gcc to produce stupid warnings continues with
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2 // warn_unused_result, which warns about things like ignoring the return code
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3 // of nice(2) (which is completely useless since -1 is a legitimate return
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4 // value on success and even the man page tells you to use errno instead).
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5
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6 // This makes it stop.
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7
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8 #undef _FORTIFY_SOURCE
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9
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10 #define _FILE_OFFSET_BITS 64
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11
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12 #define _POSIX_C_SOURCE 200809L
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13 #define _XOPEN_SOURCE 600
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14 #define _BSD_SOURCE
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15 #define _SVID_SOURCE
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16
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17 #include <stdio.h>
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18 #define fdprintf(...) dprintf(__VA_ARGS__)
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19
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20 #ifdef __GNUC__
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21 #define noreturn __attribute__((noreturn))
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22 #else
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23 #define noreturn
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24 #endif
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25
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26 #ifndef __APPLE__
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27 #include <byteswap.h>
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28 #include <endian.h>
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29
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30 #if __BYTE_ORDER == __BIG_ENDIAN
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31 #define IS_BIG_ENDIAN 1
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32 #else
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33 #define IS_BIG_ENDIAN 0
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34 #endif
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35
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36 int clearenv(void);
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37 #else
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38
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39 #ifdef __BIG_ENDIAN__
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40 #define IS_BIG_ENDIAN 1
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41 #else
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42 #define IS_BIG_ENDIAN 0
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43 #endif
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45 #endif
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46
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47 #if IS_BIG_ENDIAN
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48 #define IS_LITTLE_ENDIAN 0
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49 #define SWAP_BE16(x) (x)
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50 #define SWAP_BE32(x) (x)
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51 #define SWAP_BE64(x) (x)
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52 #define SWAP_LE16(x) bswap_16(x)
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53 #define SWAP_LE32(x) bswap_32(x)
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54 #define SWAP_LE64(x) bswap_64(x)
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55 #else
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56 #define IS_LITTLE_ENDIAN 1
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57 #define SWAP_BE16(x) bswap_16(x)
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58 #define SWAP_BE32(x) bswap_32(x)
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59 #define SWAP_BE64(x) bswap_64(x)
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60 #define SWAP_LE16(x) (x)
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61 #define SWAP_LE32(x) (x)
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62 #define SWAP_LE64(x) (x)
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63 #endif
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65 // Some versions of gcc produce spurious "may be uninitialized" warnings in
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66 // cases where it provably can't happen. Unfortunately, although this warning
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67 // is calculated and produced separately from the "is definitely used
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68 // uninitialized" warnings, there's no way to turn off the broken spurious "may
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69 // be" warnings without also turning off the non-broken "is" warnings.
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70
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71 #if CFG_TOYBOX_DEBUG
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72 #define GCC_BUG =0
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73 #else
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74 #define GCC_BUG
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75 #endif
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77 #if defined(__APPLE__) || defined(__ANDROID__)
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78 ssize_t getdelim(char **lineptr, size_t *n, int delim, FILE *stream);
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79 ssize_t getline(char **lineptr, size_t *n, FILE *stream);
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80 #endif