Subversion Repositories or1k

/*

 * 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 2002-01-16 10:25:23 markom 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;

}