forked from KolibriOS/kolibrios
173 lines
2.5 KiB
C
173 lines
2.5 KiB
C
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#include "string.h"
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void* memset(void *mem, int c, unsigned size)
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{
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unsigned i;
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for ( i = 0; i < size; i++ )
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*((char *)mem+i) = (char) c;
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return NULL;
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}
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void* memcpy(void *dst, const void *src, unsigned size)
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{
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unsigned i;
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for ( i = 0; i < size; i++)
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*(char *)(dst+i) = *(char *)(src+i);
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return NULL;
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}
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int memcmp(const void* buf1, const void* buf2, int count)
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{
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int i;
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for (i=0;i<count;i++)
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{
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if (*(unsigned char*)buf1<*(unsigned char*)buf2)
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return -1;
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if (*(unsigned char*)buf1>*(unsigned char*)buf2)
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return 1;
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}
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return 0;
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}
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void strcat(char strDest[], char strSource[])
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{
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int i, j;
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i = j = 0;
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while (strDest[i] != '\0')
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i++;
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while ((strDest[i++] = strSource[j++]) != '\0')
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;
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}
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int strcmp(const char* string1, const char* string2)
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{
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while (1)
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{
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if (*string1<*string2)
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return -1;
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if (*string1>*string2)
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return 1;
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if (*string1=='\0')
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return 0;
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string1++;
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string2++;
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}
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}
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void strcpy(char strDest[], const char strSource[])
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{
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unsigned i;
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i = 0;
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while ((strDest[i] = strSource[i]) != '\0')
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i++;
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}
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char* strncpy(char *strDest, const char *strSource, unsigned n)
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{
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unsigned i;
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if (! n )
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return strDest;
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i = 0;
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while ((strDest[i] = strSource[i]) != '\0')
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if ( (n-1) == i )
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break;
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else
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i++;
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return strDest;
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}
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int strlen(const char* string)
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{
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int i;
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i=0;
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while (*string++) i++;
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return i;
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}
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char* strchr(const char* string, int c)
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{
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while (*string)
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{
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if (*string==c)
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return (char*)string;
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string++;
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}
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return (char*)0;
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}
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void _itoa(int i, char *s)
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{
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int a, b, c, d;
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a = (i - i%1000)/1000;
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b = (i - i%100)/100 - a*10;
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c = (i - i%10)/10 - a*100 - b*10;
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d = i%10;
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s[0] = a + '0';
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s[1] = b + '0';
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s[2] = c + '0';
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s[3] = d + '0';
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s[4] = 0;
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}
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/* reverse: ïåðåâîðà÷èâàåì ñòðîêó s íà ìåñòå */
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void reverse(char s[])
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{
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int i, j;
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char c;
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for (i = 0, j = strlen(s)-1; i<j; i++, j--) {
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c = s[i];
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s[i] = s[j];
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s[j] = c;
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}
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}
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/* itoa: êîíâåðòèðóåì n â ñèìâîëû â s */
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void itoa(int n, char s[])
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{
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int i, sign;
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if ((sign = n) < 0) /* çàïèñûâàåì çíàê */
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n = -n; /* äåëàåì n ïîëîæèòåëüíûì ÷èñëîì */
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i = 0;
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do { /* ãåíåðèðóåì öèôðû â îáðàòíîì ïîðÿäêå */
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s[i++] = n % 10 + '0'; /* áåðåì ñëåäóþùóþ öèôðó */
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} while ((n /= 10) > 0); /* óäàëÿåì */
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if (sign < 0)
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s[i++] = '-';
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s[i] = '\0';
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reverse(s);
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}
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