224 lines
3.9 KiB
C
224 lines
3.9 KiB
C
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/*
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* Copyright (c) 2006-2022, RT-Thread Development Team
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*
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* SPDX-License-Identifier: Apache-2.0
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*
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* Change Logs:
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* Date Author Notes
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* 2022-01-12 Meco Man The first version.
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*/
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#include "posix/string.h"
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#include <ctype.h>
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#include <rtthread.h>
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#include <stdlib.h>
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/**
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* @brief erases the data in the n bytes of the memory starting at the
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* location pointed to by s, by writing zeros (bytes containing '\0') to that area.
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*
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* @note The bzero() function is deprecated (marked as LEGACY in POSIX. 1-2001).
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*/
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void bzero(void* s, size_t n)
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{
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rt_memset(s, 0, n);
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}
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void bcopy(const void* src, void* dest, size_t n)
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{
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rt_memcpy(dest, src, n);
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}
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int bcmp(const void* s1, const void* s2, size_t n)
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{
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return rt_memcmp(s1, s2, n);
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}
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void explicit_bzero(void* s, size_t n)
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{
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volatile char* vs = (volatile char*)s;
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while (n)
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{
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*vs++ = 0;
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n--;
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}
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}
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char* index(const char* s, int c)
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{
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return strchr(s, c);
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}
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char* rindex(const char* s, int c)
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{
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return strrchr(s, c);
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}
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int ffs(int i)
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{
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int bit;
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if (0 == i)
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return 0;
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for (bit = 1; !(i & 1); ++bit)
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i >>= 1;
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return bit;
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}
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int ffsl(long i)
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{
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int bit;
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if (0 == i)
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return 0;
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for (bit = 1; !(i & 1); ++bit)
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i >>= 1;
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return bit;
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}
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int ffsll(long long i)
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{
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int bit;
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if (0 == i)
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return 0;
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for (bit = 1; !(i & 1); ++bit)
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i >>= 1;
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return bit;
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}
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/**
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* @brief The memchr() function scans the initial n bytes of the memory area pointed to
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* by s for the first instance of c. Both c and the bytes of the memory area
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* pointed to by s are interpreted as unsigned char.
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*
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* @note This function is GNU extension, available since glibc 2.1.91.
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*/
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void* memrchr(const void* ptr, int ch, size_t pos)
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{
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char* end = (char*)ptr + pos - 1;
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while (end != ptr)
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{
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if (*end == ch)
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return end;
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end--;
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}
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return (*end == ch) ? (end) : (NULL);
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}
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size_t strnlen(const char *s, size_t maxlen)
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{
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const char *sc;
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for (sc = s; maxlen != 0 && *sc != '\0'; maxlen--, ++sc);
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return sc - s;
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}
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char* strchrnul(const char* s, int c)
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{
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while (*s != '\0' && *s != c)
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s++;
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return (char*)s;
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}
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int strcasecmp(const char* s1, const char* s2)
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{
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const unsigned char* u1 = (const unsigned char*)s1;
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const unsigned char* u2 = (const unsigned char*)s2;
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int result;
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while ((result = tolower(*u1) - tolower(*u2)) == 0 && *u1 != 0)
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{
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u1++;
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u2++;
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}
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return result;
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}
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int strncasecmp(const char* s1, const char* s2, size_t n)
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{
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const unsigned char* u1 = (const unsigned char*)s1;
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const unsigned char* u2 = (const unsigned char*)s2;
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int result;
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for (; n != 0; n--)
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{
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result = tolower(*u1) - tolower(*u2);
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if (result)
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return result;
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if (*u1 == 0)
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return 0;
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u1++;
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u2++;
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}
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return 0;
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}
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char *strdup(const char *s)
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{
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char *news = (char *)malloc(strlen(s) + 1);
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if (news)
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{
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strcpy(news, s);
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}
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return news;
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}
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char *strndup(const char *s, size_t size)
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{
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size_t nsize = strnlen(s, size);
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char *news = (char *)malloc(nsize + 1);
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if (news)
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{
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rt_memcpy(news, s, nsize);
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news[nsize] = '\0';
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}
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return news;
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}
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rt_weak char *strtok_r(char *str, const char *delim, char **saveptr)
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{
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char *pbegin;
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char *pend = NULL;
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if (str)
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{
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pbegin = str;
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}
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else if (saveptr && *saveptr)
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{
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pbegin = *saveptr;
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}
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else
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{
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return NULL;
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}
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for (;*pbegin && strchr(delim, *pbegin) != NULL; pbegin++);
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if (!*pbegin)
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{
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return NULL;
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}
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for (pend = pbegin + 1; *pend && strchr(delim, *pend) == NULL; pend++);
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if (*pend)
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{
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*pend++ = '\0';
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}
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if (saveptr)
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{
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*saveptr = pend;
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}
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return pbegin;
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}
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