43 lines
709 B
C
43 lines
709 B
C
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// SPDX-License-Identifier: LGPL-3.0-or-later
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/**
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* \file strnicmp.c
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*
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* Implements `Df_strnicmp()`.
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*
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* \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
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* \author Lorenzo Cogotti
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*/
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#include "strlib.h"
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int Df_strnicmp(const char *a, const char *b, size_t n)
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{
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int c1, c2;
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do {
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if (!n--)
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return 0; // strings are equal until end point
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c1 = *a++;
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c2 = *b++;
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int d = c1 - c2;
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while (d != 0) {
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if (c1 <= 'Z' && c1 >= 'A') {
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d += ('a' - 'A');
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if (d == 0)
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break;
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}
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if (c2 <= 'Z' && c2 >= 'A') {
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d -= ('a' - 'A');
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if (d == 0)
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break;
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}
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return ((d >= 0) << 1) - 1;
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}
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} while (c1 != '\0');
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return 0; // strings are equal
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}
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