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Rev | Author | Line No. | Line |
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4349 | Serge | 1 | /* |
2 | FUNCTION |
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3 | < |
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4 | |||
5 | INDEX |
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6 | stpcpy |
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7 | |||
8 | ANSI_SYNOPSIS |
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9 | #include |
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4921 | Serge | 10 | char *stpcpy(char *restrict <[dst]>, const char *restrict <[src]>); |
4349 | Serge | 11 | |
12 | TRAD_SYNOPSIS |
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13 | #include |
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14 | char *stpcpy(<[dst]>, <[src]>) |
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15 | char *<[dst]>; |
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16 | char *<[src]>; |
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17 | |||
18 | DESCRIPTION |
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19 | < |
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20 | (including the terminating null character) to the array |
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21 | pointed to by <[dst]>. |
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22 | |||
23 | RETURNS |
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24 | This function returns a pointer to the end of the destination string, |
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25 | thus pointing to the trailing '\0'. |
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26 | |||
27 | PORTABILITY |
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28 | < |
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29 | |||
30 | < |
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31 | |||
32 | QUICKREF |
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33 | stpcpy gnu |
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34 | */ |
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35 | |||
36 | #include |
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37 | #include |
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38 | |||
39 | /*SUPPRESS 560*/ |
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40 | /*SUPPRESS 530*/ |
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41 | |||
42 | /* Nonzero if either X or Y is not aligned on a "long" boundary. */ |
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43 | #define UNALIGNED(X, Y) \ |
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44 | (((long)X & (sizeof (long) - 1)) | ((long)Y & (sizeof (long) - 1))) |
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45 | |||
46 | #if LONG_MAX == 2147483647L |
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47 | #define DETECTNULL(X) (((X) - 0x01010101) & ~(X) & 0x80808080) |
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48 | #else |
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49 | #if LONG_MAX == 9223372036854775807L |
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50 | /* Nonzero if X (a long int) contains a NULL byte. */ |
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51 | #define DETECTNULL(X) (((X) - 0x0101010101010101) & ~(X) & 0x8080808080808080) |
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52 | #else |
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53 | #error long int is not a 32bit or 64bit type. |
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54 | #endif |
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55 | #endif |
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56 | |||
57 | #ifndef DETECTNULL |
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58 | #error long int is not a 32bit or 64bit byte |
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59 | #endif |
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60 | |||
61 | char* |
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62 | _DEFUN (stpcpy, (dst, src), |
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4921 | Serge | 63 | char *__restrict dst _AND |
64 | _CONST char *__restrict src) |
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4349 | Serge | 65 | { |
66 | #if !defined(PREFER_SIZE_OVER_SPEED) && !defined(__OPTIMIZE_SIZE__) |
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67 | long *aligned_dst; |
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68 | _CONST long *aligned_src; |
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69 | |||
70 | /* If SRC or DEST is unaligned, then copy bytes. */ |
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71 | if (!UNALIGNED (src, dst)) |
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72 | { |
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73 | aligned_dst = (long*)dst; |
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74 | aligned_src = (long*)src; |
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75 | |||
76 | /* SRC and DEST are both "long int" aligned, try to do "long int" |
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77 | sized copies. */ |
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78 | while (!DETECTNULL(*aligned_src)) |
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79 | { |
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80 | *aligned_dst++ = *aligned_src++; |
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81 | } |
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82 | |||
83 | dst = (char*)aligned_dst; |
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84 | src = (char*)aligned_src; |
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85 | } |
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86 | #endif /* not PREFER_SIZE_OVER_SPEED */ |
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87 | |||
88 | while ((*dst++ = *src++)) |
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89 | ; |
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90 | return --dst; |
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91 | } |