84 lines
1.4 KiB
C
84 lines
1.4 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* linux/lib/string.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*/
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#include <string.h>
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size_t strspn(const char *s, const char *accept)
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{
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const char *p;
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const char *a;
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size_t count = 0;
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for (p = s; *p != '\0'; ++p) {
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for (a = accept; *a != '\0'; ++a) {
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if (*p == *a)
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break;
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}
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if (*a == '\0')
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return count;
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++count;
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}
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return count;
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}
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size_t strcspn(const char *s, const char *reject)
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{
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const char *p;
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const char *r;
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size_t count = 0;
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for (p = s; *p != '\0'; ++p) {
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for (r = reject; *r != '\0'; ++r) {
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if (*p == *r)
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return count;
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}
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++count;
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}
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return count;
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}
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size_t strlen(const char *s)
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{
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const char *sc;
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for (sc = s; *sc != '\0'; ++sc)
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/* nothing */;
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return sc - s;
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}
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char *strchr(const char *s, int c)
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{
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for (; *s != (char)c; ++s)
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if (*s == '\0')
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return NULL;
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return (char *)s;
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}
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char *strcpy(char *dest, const char *src)
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{
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char *tmp = dest;
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while ((*dest++ = *src++) != '\0')
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/* nothing */;
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return tmp;
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}
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int strcmp(const char *cs, const char *ct)
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{
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unsigned char c1, c2;
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while (1) {
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c1 = *cs++;
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c2 = *ct++;
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if (c1 != c2)
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return c1 < c2 ? -1 : 1;
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if (!c1)
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break;
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}
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return 0;
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}
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