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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4921 | Serge | 1 | /* |
| 2 | FUNCTION |
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| 3 | < |
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| 4 | |||
| 5 | INDEX |
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| 6 | strcat |
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| 7 | |||
| 8 | ANSI_SYNOPSIS |
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| 9 | #include |
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| 10 | char *strcat(char *restrict <[dst]>, const char *restrict <[src]>); |
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| 11 | |||
| 12 | TRAD_SYNOPSIS |
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| 13 | #include |
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| 14 | char *strcat(<[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 end of the |
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| 21 | string pointed to by <[dst]>. The initial character of |
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| 22 | <[src]> overwrites the null character at the end of <[dst]>. |
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| 23 | |||
| 24 | RETURNS |
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| 25 | This function returns the initial value of <[dst]> |
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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 | strcat ansi pure |
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| 34 | */ |
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| 35 | |||
| 36 | #include |
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| 37 | #include |
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| 38 | |||
| 39 | /* Nonzero if X is aligned on a "long" boundary. */ |
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| 40 | #define ALIGNED(X) \ |
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| 41 | (((long)X & (sizeof (long) - 1)) == 0) |
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| 42 | |||
| 43 | #if LONG_MAX == 2147483647L |
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| 44 | #define DETECTNULL(X) (((X) - 0x01010101) & ~(X) & 0x80808080) |
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| 45 | #else |
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| 46 | #if LONG_MAX == 9223372036854775807L |
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| 47 | /* Nonzero if X (a long int) contains a NULL byte. */ |
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| 48 | #define DETECTNULL(X) (((X) - 0x0101010101010101) & ~(X) & 0x8080808080808080) |
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| 49 | #else |
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| 50 | #error long int is not a 32bit or 64bit type. |
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| 51 | #endif |
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| 52 | #endif |
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| 53 | |||
| 54 | #ifndef DETECTNULL |
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| 55 | #error long int is not a 32bit or 64bit byte |
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| 56 | #endif |
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| 57 | |||
| 58 | |||
| 59 | /*SUPPRESS 560*/ |
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| 60 | /*SUPPRESS 530*/ |
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| 61 | |||
| 62 | char * |
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| 63 | _DEFUN (strcat, (s1, s2), |
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| 64 | char *__restrict s1 _AND |
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| 65 | _CONST char *__restrict s2) |
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| 66 | { |
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| 67 | #if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__) |
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| 68 | char *s = s1; |
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| 69 | |||
| 70 | while (*s1) |
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| 71 | s1++; |
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| 72 | |||
| 73 | while (*s1++ = *s2++) |
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| 74 | ; |
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| 75 | return s; |
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| 76 | #else |
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| 77 | char *s = s1; |
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| 78 | |||
| 79 | |||
| 80 | /* Skip over the data in s1 as quickly as possible. */ |
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| 81 | if (ALIGNED (s1)) |
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| 82 | { |
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| 83 | unsigned long *aligned_s1 = (unsigned long *)s1; |
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| 84 | while (!DETECTNULL (*aligned_s1)) |
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| 85 | aligned_s1++; |
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| 86 | |||
| 87 | s1 = (char *)aligned_s1; |
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| 88 | } |
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| 89 | |||
| 90 | while (*s1) |
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| 91 | s1++; |
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| 92 | |||
| 93 | /* s1 now points to the its trailing null character, we can |
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| 94 | just use strcpy to do the work for us now. |
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| 95 | |||
| 96 | ?!? We might want to just include strcpy here. |
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| 97 | Also, this will cause many more unaligned string copies because |
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| 98 | s1 is much less likely to be aligned. I don't know if its worth |
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| 99 | tweaking strcpy to handle this better. */ |
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| 100 | strcpy (s1, s2); |
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| 101 | |||
| 102 | return s; |
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| 103 | #endif /* not PREFER_SIZE_OVER_SPEED */ |
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| 104 | } |