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49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
// Copyright 2022 Google LLC.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/*
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* Implementation of libC strings.h functions.
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*/
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#include <strings.h>
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#include <ctype.h>
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int strcasecmp(const char *p1, const char *p2) {
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const unsigned char *s1 = (const unsigned char *)p1;
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const unsigned char *s2 = (const unsigned char *)p2;
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while (1) {
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const unsigned int c1 = tolower(*s1++);
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const unsigned int c2 = tolower(*s2++);
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if ((c1 == '\0') || (c1 != c2)) return (c1 - c2);
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}
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/* not reached */
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return 0;
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}
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int strncasecmp(const char *p1, const char *p2, size_t n) {
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const unsigned char *s1 = (const unsigned char *)p1;
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const unsigned char *s2 = (const unsigned char *)p2;
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while (n > 0) {
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const unsigned char c1 = tolower(*s1++);
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const unsigned char c2 = tolower(*s2++);
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if ((c1 == '\0') || (c1 != c2)) return (c1 - c2);
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n--;
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}
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return 0;
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}
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