| 0,0 → 1,128 |
|---|
| #include "common.h" |
| |
| char * strcat(char *s, const char *append) |
| { |
| int d0, d1, d2, d3; |
| __asm__ __volatile__( |
| "repne\n\t" |
| "scasb\n\t" |
| "decl %1\n" |
| "1:\tlodsb\n\t" |
| "stosb\n\t" |
| "testb %%al,%%al\n\t" |
| "jne 1b" |
| : "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3) |
| : "0" (append),"1"(s),"2"(0),"3" (0xffffffff):"memory"); |
| return s; |
| } |
| |
| int |
| memcmp(const void *s1, const void *s2, size_t n) |
| { |
| if (n != 0) |
| { |
| const unsigned char *p1 = s1, *p2 = s2; |
| |
| do { |
| if (*p1++ != *p2++) |
| return (*--p1 - *--p2); |
| } while (--n != 0); |
| } |
| return 0; |
| } |
| |
| void * memcpy(void * _dest, const void *_src, size_t _n) |
| { |
| int d0, d1, d2; |
| __asm__ __volatile__( |
| "jcxz 1f\n\t" |
| "rep ; movsl\n\t" |
| "1:\t" |
| "testb $2,%b4\n\t" |
| "je 1f\n\t" |
| "movsw\n" |
| "1:\ttestb $1,%b4\n\t" |
| "je 2f\n\t" |
| "movsb\n" |
| "2:" |
| : "=&c" (d0), "=&D" (d1), "=&S" (d2) |
| :"0" (_n/4), "q" (_n),"1" ((long)_dest),"2" ((long)_src) |
| : "memory"); |
| return (_dest); |
| } |
| |
| char * strcpy(char *to, const char *from) |
| { |
| int d0, d1, d2; |
| __asm__ __volatile__( |
| "1:\tlodsb\n\t" |
| "stosb\n\t" |
| "testb %%al,%%al\n\t" |
| "jne 1b" |
| : "=&S" (d0), "=&D" (d1), "=&a" (d2) |
| :"0" (from),"1" (to) : "memory"); |
| return to; |
| } |
| |
| int strcmp(const char *s1, const char *s2) |
| { |
| int d0, d1; |
| register int __res; |
| __asm__ __volatile__( |
| "1:\tlodsb\n\t" |
| "scasb\n\t" |
| "jne 2f\n\t" |
| "testb %%al,%%al\n\t" |
| "jne 1b\n\t" |
| "xorl %%eax,%%eax\n\t" |
| "jmp 3f\n" |
| "2:\tsbbl %%eax,%%eax\n\t" |
| "orb $1,%%al\n" |
| "3:" |
| :"=a" (__res), "=&S" (d0), "=&D" (d1) |
| :"1" (s1),"2" (s2)); |
| return __res; |
| } |
| |
| size_t strlen(const char *str) |
| { |
| int d0; |
| register int __res; |
| __asm__ __volatile__( |
| "repne\n\t" |
| "scasb\n\t" |
| "notl %0\n\t" |
| "decl %0" |
| :"=c" (__res), "=&D" (d0) :"1" (str),"a" (0), "0" (0xffffffff)); |
| return __res; |
| } |
| |
| char * strdup(const char *_s) |
| { |
| char *rv; |
| if (_s == 0) |
| return 0; |
| rv = (char *)malloc(strlen(_s) + 1); |
| if (rv == 0) |
| return 0; |
| strcpy(rv, _s); |
| return rv; |
| } |
| |
| char * strchr(const char *s, int c) |
| { |
| int d0; |
| register char * __res; |
| __asm__ __volatile__( |
| "movb %%al,%%ah\n" |
| "1:\tlodsb\n\t" |
| "cmpb %%ah,%%al\n\t" |
| "je 2f\n\t" |
| "testb %%al,%%al\n\t" |
| "jne 1b\n\t" |
| "movl $1,%1\n" |
| "2:\tmovl %1,%0\n\t" |
| "decl %0" |
| :"=a" (__res), "=&S" (d0) : "1" (s),"0" (c)); |
| return __res; |
| } |