/* * strncasecmp.c -- * * Source code for the "strncasecmp" library routine. * * Copyright (c) 1988-1993 The Regents of the University of California. * Copyright (c) 1995-1996 Sun Microsystems, Inc. * * See the file "license.terms" for information on usage and redistribution * of this file, and for a DISCLAIMER OF ALL WARRANTIES. * * RCS: @(#) $Id: strncasecmp.c,v 1.1.1.1 2007/07/10 15:04:23 duncan Exp $ */ #include "tclPort.h" /* * This array is designed for mapping upper and lower case letter * together for a case independent comparison. The mappings are * based upon ASCII character sequences. */ static unsigned char charmap[] = { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xe1, 0xe2, 0xe3, 0xe4, 0xc5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xec, 0xed, 0xee, 0xef, 0xf0, 0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfc, 0xfd, 0xfe, 0xff, }; /* * Here are the prototypes just in case they are not included * in tclPort.h. */ int strncasecmp _ANSI_ARGS_((CONST char *s1, CONST char *s2, size_t n)); int strcasecmp _ANSI_ARGS_((CONST char *s1, CONST char *s2)); /* *---------------------------------------------------------------------- * * strcasecmp -- * * Compares two strings, ignoring case differences. * * Results: * Compares two null-terminated strings s1 and s2, returning -1, 0, * or 1 if s1 is lexicographically less than, equal to, or greater * than s2. * * Side effects: * None. * *---------------------------------------------------------------------- */ int strcasecmp(s1, s2) CONST char *s1; /* First string. */ CONST char *s2; /* Second string. */ { unsigned char u1, u2; for ( ; ; s1++, s2++) { u1 = (unsigned char) *s1; u2 = (unsigned char) *s2; if ((u1 == '\0') || (charmap[u1] != charmap[u2])) { break; } } return charmap[u1] - charmap[u2]; } /* *---------------------------------------------------------------------- * * strncasecmp -- * * Compares two strings, ignoring case differences. * * Results: * Compares up to length chars of s1 and s2, returning -1, 0, or 1 * if s1 is lexicographically less than, equal to, or greater * than s2 over those characters. * * Side effects: * None. * *---------------------------------------------------------------------- */ int strncasecmp(s1, s2, length) CONST char *s1; /* First string. */ CONST char *s2; /* Second string. */ size_t length; /* Maximum number of characters to compare * (stop earlier if the end of either string * is reached). */ { unsigned char u1, u2; for (; length != 0; length--, s1++, s2++) { u1 = (unsigned char) *s1; u2 = (unsigned char) *s2; if (charmap[u1] != charmap[u2]) { return charmap[u1] - charmap[u2]; } if (u1 == '\0') { return 0; } } return 0; }