129 lines
2.3 KiB
C
129 lines
2.3 KiB
C
#include "common.h"
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char * strcat(char *s, const char *append)
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{
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int d0, d1, d2, d3;
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__asm__ __volatile__(
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"repne\n\t"
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"scasb\n\t"
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"decl %1\n"
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"1:\tlodsb\n\t"
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"stosb\n\t"
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"testb %%al,%%al\n\t"
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"jne 1b"
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: "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3)
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: "0" (append),"1"(s),"2"(0),"3" (0xffffffff):"memory");
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return s;
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}
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int
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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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{
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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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void * memcpy(void * _dest, const void *_src, size_t _n)
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{
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int d0, d1, d2;
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__asm__ __volatile__(
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"jcxz 1f\n\t"
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"rep ; movsl\n\t"
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"1:\t"
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"testb $2,%b4\n\t"
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"je 1f\n\t"
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"movsw\n"
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"1:\ttestb $1,%b4\n\t"
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"je 2f\n\t"
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"movsb\n"
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"2:"
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: "=&c" (d0), "=&D" (d1), "=&S" (d2)
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:"0" (_n/4), "q" (_n),"1" ((long)_dest),"2" ((long)_src)
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: "memory");
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return (_dest);
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}
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char * strcpy(char *to, const char *from)
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{
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int d0, d1, d2;
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__asm__ __volatile__(
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"1:\tlodsb\n\t"
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"stosb\n\t"
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"testb %%al,%%al\n\t"
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"jne 1b"
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: "=&S" (d0), "=&D" (d1), "=&a" (d2)
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:"0" (from),"1" (to) : "memory");
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return to;
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}
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int strcmp(const char *s1, const char *s2)
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{
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int d0, d1;
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register int __res;
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__asm__ __volatile__(
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"1:\tlodsb\n\t"
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"scasb\n\t"
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"jne 2f\n\t"
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"testb %%al,%%al\n\t"
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"jne 1b\n\t"
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"xorl %%eax,%%eax\n\t"
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"jmp 3f\n"
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"2:\tsbbl %%eax,%%eax\n\t"
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"orb $1,%%al\n"
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"3:"
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:"=a" (__res), "=&S" (d0), "=&D" (d1)
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:"1" (s1),"2" (s2));
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return __res;
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}
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size_t strlen(const char *str)
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{
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int d0;
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register int __res;
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__asm__ __volatile__(
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"repne\n\t"
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"scasb\n\t"
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"notl %0\n\t"
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"decl %0"
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:"=c" (__res), "=&D" (d0) :"1" (str),"a" (0), "0" (0xffffffff));
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return __res;
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}
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char * strdup(const char *_s)
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{
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char *rv;
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if (_s == 0)
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return 0;
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rv = (char *)malloc(strlen(_s) + 1);
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if (rv == 0)
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return 0;
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strcpy(rv, _s);
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return rv;
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}
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char * strchr(const char *s, int c)
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{
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int d0;
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register char * __res;
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__asm__ __volatile__(
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"movb %%al,%%ah\n"
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"1:\tlodsb\n\t"
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"cmpb %%ah,%%al\n\t"
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"je 2f\n\t"
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"testb %%al,%%al\n\t"
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"jne 1b\n\t"
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"movl $1,%1\n"
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"2:\tmovl %1,%0\n\t"
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"decl %0"
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:"=a" (__res), "=&S" (d0) : "1" (s),"0" (c));
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return __res;
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}
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