mirror of
https://github.com/hermitcore/libhermit.git
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136 lines
2.2 KiB
C
136 lines
2.2 KiB
C
/*
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* Written by the Chair for Operating Systems, RWTH Aachen University
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*
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* NO Copyright (C) 2010-2011, Stefan Lankes
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* consider these trivial functions to be public domain.
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*
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* These functions are 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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*/
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#include <hermit/string.h>
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#if !HAVE_ARCH_MEMCPY
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void *_memcpy(void *dest, const void *src, size_t count)
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{
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size_t i;
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if (BUILTIN_EXPECT(!dest || !src, 0))
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return dest;
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for (i = 0; i < count; i++)
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((char*)dest)[i] = ((char*)src)[i];
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return dest;
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}
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#endif
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#if !HAVE_ARCH_MEMSET
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void *_memset(void *dest, int val, size_t count)
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{
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size_t i;
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if (BUILTIN_EXPECT(!dest, 0))
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return dest;
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for (i = 0; i < count; i++)
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((char*) dest)[i] = (char) val;
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return dest;
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}
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#endif
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#if !HAVE_ARCH_MEMCMP
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int _memcmp(const void *s1, const void *s2, size_t n)
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{
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if (n != 0) {
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const unsigned char *p1 = s1, *p2 = s2;
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do {
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if (*p1++ != *p2++)
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return (*--p1 - *--p2);
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} while(--n != 0);
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}
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return 0;
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}
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#endif
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#if !HAVE_ARCH_STRLEN
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size_t _strlen(const char *str)
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{
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size_t len = 0;
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if (BUILTIN_EXPECT(!str, 0))
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return len;
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while (str[len] != '\0')
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len++;
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return len;
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}
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#endif
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#if !HAVE_ARCH_STRNCPY
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char* _strncpy(char *dest, const char *src, size_t n)
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{
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size_t i;
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if (BUILTIN_EXPECT(!dest || !src, 0))
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return dest;
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for (i = 0 ; i < n && src[i] != '\0' ; i++)
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dest[i] = src[i];
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if (i < n)
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dest[i] = '\0';
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else
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dest[n-1] = '\0';
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return dest;
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}
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#endif
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#if !HAVE_ARCH_STRCPY
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char* _strcpy(char *dest, const char *src)
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{
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size_t i;
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if (BUILTIN_EXPECT(!dest || !src, 0))
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return dest;
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for (i = 0 ; src[i] != '\0' ; i++)
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dest[i] = src[i];
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dest[i] = '\0';
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return dest;
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}
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#endif
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#if !HAVE_ARCH_STRCMP
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int _strcmp(const char *s1, const char *s2)
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{
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while (*s1 != '\0' && *s1 == *s2) {
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s1++;
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s2++;
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}
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return (*(unsigned char *) s1) - (*(unsigned char *) s2);
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}
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#endif
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#if !HAVE_ARCH_STRNCMP
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int _strncmp(const char *s1, const char *s2, size_t n)
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{
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if (BUILTIN_EXPECT(n == 0, 0))
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return 0;
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while (n-- != 0 && *s1 == *s2) {
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if (n == 0 || *s1 == '\0')
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break;
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s1++;
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s2++;
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}
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return (*(unsigned char *) s1) - (*(unsigned char *) s2);
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}
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#endif
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