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105 lines
3.5 KiB
105 lines
3.5 KiB
/* |
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* Copyright (c) 1987 Regents of the University of California. |
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* All rights reserved. |
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* |
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* Redistribution and use in source and binary forms are permitted |
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* provided that this notice is preserved and that due credit is given |
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* to the University of California at Berkeley. The name of the University |
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* may not be used to endorse or promote products derived from this |
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* software without specific written prior permission. This software |
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* is provided ``as is'' without express or implied warranty. |
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*/ |
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#include "ascii_strcasecmp.h" |
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/* |
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* This array maps upper-case ASCII letters to their lower-case |
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* equivalents; all other byte values are mapped to themselves, |
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* so this is locale-independent and intended to be locale-independent, |
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* to avoid issues with, for example, "i" and "I" not being lower-case |
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* and upper-case versions of the same letter in Turkish, where |
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* there are separate "i with dot" and "i without dot" letters. |
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*/ |
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static const unsigned char charmap[] = { |
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0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, |
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0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, |
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0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, |
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0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, |
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0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, |
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0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, |
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0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, |
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0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, |
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0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, |
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0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, |
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0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, |
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0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, |
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0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, |
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0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, |
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0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, |
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0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, |
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0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, |
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0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, |
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0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, |
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0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, |
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0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, |
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0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, |
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0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, |
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0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, |
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0xc0, 0xc1, 0xc2, 0xc3, 0xc4, 0xc5, 0xc6, 0xc7, |
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0xc8, 0xc9, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, |
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0xd0, 0xd1, 0xd2, 0xd3, 0xd4, 0xd5, 0xd6, 0xd7, |
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0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, |
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0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, |
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0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, |
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0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, |
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0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, |
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}; |
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int |
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ascii_strcasecmp(const char *s1, const char *s2) |
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{ |
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register const unsigned char *cm = charmap, |
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*us1 = (const unsigned char *)s1, |
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*us2 = (const unsigned char *)s2; |
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while (cm[*us1] == cm[*us2++]) |
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if (*us1++ == '\0') |
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return(0); |
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return(cm[*us1] - cm[*--us2]); |
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} |
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int |
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ascii_strncasecmp(const char *s1, const char *s2, register size_t n) |
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{ |
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register const unsigned char *cm = charmap, |
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*us1 = (const unsigned char *)s1, |
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*us2 = (const unsigned char *)s2; |
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for (;;) { |
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if (n == 0) { |
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/* |
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* We've run out of characters that we should |
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* compare, and they've all been equal; return |
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* 0, to indicate that the prefixes are the |
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* same. |
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*/ |
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return(0); |
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} |
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if (cm[*us1] != cm[*us2++]) { |
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/* |
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* We've found a mismatch. |
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*/ |
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break; |
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} |
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if (*us1++ == '\0') { |
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/* |
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* We've run out of characters *to* compare, |
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* and they've all been equal; return 0, to |
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* indicate that the strings are the same. |
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*/ |
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return(0); |
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} |
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n--; |
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} |
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return(cm[*us1] - cm[*--us2]); |
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}
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