| 1 | /* |
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| 2 | FUNCTION |
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| 3 | <<strcpy>>---copy string |
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| 4 | |
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| 5 | INDEX |
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| 6 | strcpy |
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| 7 | |
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| 8 | SYNOPSIS |
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| 9 | #include <string.h> |
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| 10 | char *strcpy(char *<[dst]>, const char *<[src]>); |
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| 11 | |
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| 12 | DESCRIPTION |
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| 13 | <<strcpy>> copies the string pointed to by <[src]> |
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| 14 | (including the terminating null character) to the array |
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| 15 | pointed to by <[dst]>. |
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| 16 | |
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| 17 | RETURNS |
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| 18 | This function returns the initial value of <[dst]>. |
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| 19 | |
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| 20 | PORTABILITY |
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| 21 | <<strcpy>> is ANSI C. |
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| 22 | |
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| 23 | <<strcpy>> requires no supporting OS subroutines. |
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| 24 | |
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| 25 | QUICKREF |
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| 26 | strcpy ansi pure |
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| 27 | */ |
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| 28 | |
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| 29 | #include <string.h> |
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| 30 | #include <limits.h> |
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| 31 | |
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| 32 | /*SUPPRESS 560*/ |
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| 33 | /*SUPPRESS 530*/ |
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| 34 | |
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| 35 | /* Nonzero if either X or Y is not aligned on a "long" boundary. */ |
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| 36 | #define UNALIGNED(X, Y) \ |
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| 37 | (((long)X & (sizeof (long) - 1)) | ((long)Y & (sizeof (long) - 1))) |
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| 38 | |
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| 39 | #if LONG_MAX == 2147483647L |
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| 40 | #define DETECTNULL(X) (((X) - 0x01010101) & ~(X) & 0x80808080) |
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| 41 | #else |
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| 42 | #if LONG_MAX == 9223372036854775807L |
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| 43 | /* Nonzero if X (a long int) contains a NULL byte. */ |
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| 44 | #define DETECTNULL(X) (((X) - 0x0101010101010101) & ~(X) & 0x8080808080808080) |
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| 45 | #else |
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| 46 | #error long int is not a 32bit or 64bit type. |
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| 47 | #endif |
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| 48 | #endif |
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| 49 | |
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| 50 | #ifndef DETECTNULL |
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| 51 | #error long int is not a 32bit or 64bit byte |
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| 52 | #endif |
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| 53 | |
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| 54 | char* |
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| 55 | strcpy (char *dst0, |
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| 56 | const char *src0) |
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| 57 | { |
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| 58 | #if defined(PREFER_SIZE_OVER_SPEED) || defined(__OPTIMIZE_SIZE__) |
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| 59 | char *s = dst0; |
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| 60 | |
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| 61 | while (*dst0++ = *src0++) |
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| 62 | ; |
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| 63 | |
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| 64 | return s; |
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| 65 | #else |
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| 66 | char *dst = dst0; |
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| 67 | const char *src = src0; |
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| 68 | long *aligned_dst; |
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| 69 | const long *aligned_src; |
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| 70 | |
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| 71 | /* If SRC or DEST is unaligned, then copy bytes. */ |
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| 72 | if (!UNALIGNED (src, dst)) |
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| 73 | { |
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| 74 | aligned_dst = (long*)dst; |
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| 75 | aligned_src = (long*)src; |
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| 76 | |
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| 77 | /* SRC and DEST are both "long int" aligned, try to do "long int" |
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| 78 | sized copies. */ |
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| 79 | while (!DETECTNULL(*aligned_src)) |
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| 80 | { |
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| 81 | *aligned_dst++ = *aligned_src++; |
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| 82 | } |
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| 83 | |
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| 84 | dst = (char*)aligned_dst; |
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| 85 | src = (char*)aligned_src; |
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| 86 | } |
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| 87 | |
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| 88 | while ((*dst++ = *src++)) |
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| 89 | ; |
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| 90 | return dst0; |
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| 91 | #endif /* not PREFER_SIZE_OVER_SPEED */ |
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| 92 | } |
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