Popa Adrian Marius
436 linhas
8.6 KiB
C
436 linhas
8.6 KiB
C
#ifndef _STRING_H_
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#define _STRING_H_
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#ifndef NULL
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#define NULL ((void *) 0)
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#endif
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#ifndef _SIZE_T
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#define _SIZE_T
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typedef unsigned int size_t;
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#endif
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extern char * strerror(int errno);
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/*
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* This string-include defines all string functions as inline
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* functions. Use gcc. It also assumes ds=es=data space, this should be
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* normal. Most of the string-functions are rather heavily hand-optimized,
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* see especially strtok,strstr,str[c]spn. They should work, but are not
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* very easy to understand. Everything is done entirely within the register
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* set, making the functions fast and clean. String instructions have been
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* used through-out, making for "slightly" unclear code :-)
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*
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* (C) 1991 Linus Torvalds
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*/
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extern inline char * strcpy(char * dest,const char *src)
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{
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int d0, d1, d2;
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__asm__ __volatile__("cld\n\t"
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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" (src),"1" (dest) : "memory");
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return dest;
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}
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extern inline char * strncpy(char * dest,const char *src,int count)
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{
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int d0, d1, d2, d3;
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__asm__ __volatile__("cld\n\t"
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"1:\tdecl %2\n\t"
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"js 2f\n\t"
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"lodsb\n\t"
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"stosb\n\t"
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"testb %%al,%%al\n\t"
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"jne 1b\n\t"
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"rep\n\t"
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"stosb\n"
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"2:"
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: "=&S" (d0), "=&D" (d1), "=&c" (d2), "=&a" (d3)
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:"0" (src),"1" (dest),"2" (count) : "memory");
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return dest;
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}
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extern inline char * strcat(char * dest,const char * src)
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{
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int d0, d1, d2, d3;
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__asm__ __volatile__("cld\n\t"
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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" (src), "1" (dest), "2" (0), "3" (0xffffffffu):"memory");
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return dest;
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}
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extern inline char * strncat(char * dest,const char * src,int count)
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{
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int d0, d1, d2, d3;
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__asm__ __volatile__("cld\n\t"
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"repne\n\t"
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"scasb\n\t"
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"decl %1\n\t"
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"movl %8,%3\n"
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"1:\tdecl %3\n\t"
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"js 2f\n\t"
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"lodsb\n\t"
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"stosb\n\t"
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"testb %%al,%%al\n\t"
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"jne 1b\n"
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"2:\txorl %2,%2\n\t"
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"stosb"
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: "=&S" (d0), "=&D" (d1), "=&a" (d2), "=&c" (d3)
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: "0" (src),"1" (dest),"2" (0),"3" (0xffffffffu), "g" (count)
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: "memory");
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return dest;
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}
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extern inline int strcmp(const char * cs,const char * ct)
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{
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int d0, d1;
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register int __res;
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__asm__ __volatile__("cld\n\t"
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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" (cs),"2" (ct)
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:"memory");
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return __res;
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}
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extern inline int strncmp(const char * cs,const char * ct,int count)
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{
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register int __res;
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int d0, d1, d2;
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__asm__ __volatile__("cld\n\t"
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"1:\tdecl %3\n\t"
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"js 2f\n\t"
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"lodsb\n\t"
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"scasb\n\t"
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"jne 3f\n\t"
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"testb %%al,%%al\n\t"
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"jne 1b\n"
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"2:\txorl %%eax,%%eax\n\t"
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"jmp 4f\n"
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"3:\tsbbl %%eax,%%eax\n\t"
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"orb $1,%%al\n"
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"4:"
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:"=a" (__res), "=&S" (d0), "=&D" (d1), "=&c" (d2)
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:"1" (cs),"2" (ct),"3" (count)
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:"memory");
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return __res;
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}
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extern inline 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)
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:"1" (s),"0" (c)
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:"memory");
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return __res;
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}
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extern inline char * strrchr(const char * s,int c)
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{
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int d0, d1;
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register char * __res;
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__asm__ __volatile__("cld\n\t"
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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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"jne 2f\n\t"
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"leal -1(%%esi),%0\n"
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"2:\ttestb %%al,%%al\n\t"
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"jne 1b"
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:"=g" (__res), "=&S" (d0), "=&a" (d1)
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:"0" (0),"1" (s),"2" (c)
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:"memory");
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return __res;
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}
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extern inline int strspn(const char * cs, const char * ct)
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{
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register char * __res;// __asm__("si");
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__asm__("cld\n\t"
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"movl %4,%%edi\n\t"
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"repne\n\t"
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"scasb\n\t"
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"notl %%ecx\n\t"
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"decl %%ecx\n\t"
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"movl %%ecx,%%edx\n"
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"1:\tlodsb\n\t"
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"testb %%al,%%al\n\t"
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"je 2f\n\t"
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"movl %4,%%edi\n\t"
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"movl %%edx,%%ecx\n\t"
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"repne\n\t"
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"scasb\n\t"
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"je 1b\n"
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"2:\tdecl %0"
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:"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
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:/*"ax","cx",*/"dx","di"); /* TODO : constraint may be wrong*/
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return __res-cs;
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}
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extern inline int strcspn(const char * cs, const char * ct)
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{
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register char * __res;// __asm__("si");
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__asm__("cld\n\t"
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"movl %4,%%edi\n\t"
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"repne\n\t"
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"scasb\n\t"
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"notl %%ecx\n\t"
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"decl %%ecx\n\t"
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"movl %%ecx,%%edx\n"
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"1:\tlodsb\n\t"
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"testb %%al,%%al\n\t"
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"je 2f\n\t"
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"movl %4,%%edi\n\t"
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"movl %%edx,%%ecx\n\t"
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"repne\n\t"
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"scasb\n\t"
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"jne 1b\n"
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"2:\tdecl %0"
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:"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
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:/*"ax","cx",*/"dx","di"); /* TODO : constraint may be wrong*/
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return __res-cs;
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}
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extern inline char * strpbrk(const char * cs,const char * ct)
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{
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register char * __res;// __asm__("si");
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__asm__("cld\n\t"
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"movl %4,%%edi\n\t"
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"repne\n\t"
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"scasb\n\t"
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"notl %%ecx\n\t"
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"decl %%ecx\n\t"
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"movl %%ecx,%%edx\n"
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"1:\tlodsb\n\t"
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"testb %%al,%%al\n\t"
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"je 2f\n\t"
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"movl %4,%%edi\n\t"
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"movl %%edx,%%ecx\n\t"
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"repne\n\t"
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"scasb\n\t"
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"jne 1b\n\t"
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"decl %0\n\t"
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"jmp 3f\n"
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"2:\txorl %0,%0\n"
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"3:"
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:"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
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:/*"ax","cx",*/"dx","di");/* TODO : constraint may be wrong*/
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return __res;
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}
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extern inline char * strstr(const char * cs,const char * ct)
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{
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register char * __res;// __asm__("ax");
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__asm__("cld\n\t" \
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"movl %4,%%edi\n\t"
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"repne\n\t"
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"scasb\n\t"
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"notl %%ecx\n\t"
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"decl %%ecx\n\t" /* NOTE! This also sets Z if searchstring='' */
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"movl %%ecx,%%edx\n"
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"1:\tmovl %4,%%edi\n\t"
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"movl %%esi,%%eax\n\t"
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"movl %%edx,%%ecx\n\t"
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"repe\n\t"
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"cmpsb\n\t"
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"je 2f\n\t" /* also works for empty string, see above */
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"xchgl %%eax,%%esi\n\t"
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"incl %%esi\n\t"
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"cmpb $0,-1(%%eax)\n\t"
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"jne 1b\n\t"
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"xorl %%eax,%%eax\n\t"
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"2:"
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:"=a" (__res):"0" (0),"c" (0xffffffff),"S" (cs),"g" (ct)
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:/*"cx",*/"dx","di"/*,"si"*/); /* TODO : constraint may be wrong*/
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return __res;
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}
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extern inline int strlen(const char * s)
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{
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int d0;
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register int __res;
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__asm__ __volatile__("cld\n\t"
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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)
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:"1" (s),"a" (0), "0" (0xffffffffu)
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:"memory");
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return __res;
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}
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extern char * ___strtok;
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extern inline char * strtok(char * s,const char * ct)
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{
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register char * __res;// __asm__("si");
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__asm__("testl %1,%1\n\t"
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"jne 1f\n\t"
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"testl %0,%0\n\t"
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"je 8f\n\t"
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"movl %0,%1\n"
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"1:\txorl %0,%0\n\t"
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"movl $-1,%%ecx\n\t"
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"xorl %%eax,%%eax\n\t"
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"cld\n\t"
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"movl %4,%%edi\n\t"
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"repne\n\t"
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"scasb\n\t"
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"notl %%ecx\n\t"
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"decl %%ecx\n\t"
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"je 7f\n\t" /* empty delimeter-string */
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"movl %%ecx,%%edx\n"
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"2:\tlodsb\n\t"
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"testb %%al,%%al\n\t"
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"je 7f\n\t"
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"movl %4,%%edi\n\t"
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"movl %%edx,%%ecx\n\t"
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"repne\n\t"
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"scasb\n\t"
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"je 2b\n\t"
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"decl %1\n\t"
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"cmpb $0,(%1)\n\t"
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"je 7f\n\t"
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"movl %1,%0\n"
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"3:\tlodsb\n\t"
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"testb %%al,%%al\n\t"
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"je 5f\n\t"
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"movl %4,%%edi\n\t"
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"movl %%edx,%%ecx\n\t"
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"repne\n\t"
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"scasb\n\t"
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"jne 3b\n\t"
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"decl %1\n\t"
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"cmpb $0,(%1)\n\t"
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"je 5f\n\t"
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"movb $0,(%1)\n\t"
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"incl %1\n\t"
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"jmp 6f\n"
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"5:\txorl %1,%1\n"
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"6:\tcmpb $0,(%0)\n\t"
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"jne 7f\n\t"
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"xorl %0,%0\n"
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"7:\ttestl %0,%0\n\t"
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"jne 8f\n\t"
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"movl %0,%1\n"
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"8:"
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:"=b" (__res),"=S" (___strtok)
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:"0" (___strtok),"1" (s),"g" (ct)
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:"ax","cx","dx","di"); /* TODO : constraint may be wrong*/
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return __res;
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}
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extern inline void * memcpy(void * dest,const void * src, int n)
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{
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int d0,d1,d2;
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__asm__ __volatile("cld\n\t"
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"rep\n\t"
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"movsb"
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:"=&c" (d0), "=&S" (d1), "=&D" (d2)
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:"0" (n),"1" (src),"2" (dest)
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:"memory");
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return dest;
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}
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extern inline void * memmove(void * dest,const void * src, int n)
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{
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int d0, d1, d2;
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if (dest < src) {
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memcpy(dest,src,n);
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} else {
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__asm__ __volatile__(
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"std\n\t"
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"rep\n\t"
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"movsb\n\t"
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"cld"
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: "=&c" (d0), "=&S" (d1), "=&D" (d2)
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:"0" (n),
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"1" (n-1+(const char *)src),
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"2" (n-1+(char *)dest)
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:"memory");
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}
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return dest;
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}
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extern inline int memcmp(const void * cs,const void * ct,int count)
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{
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register int __res;// __asm__("ax");
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__asm__("cld\n\t"
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"repe\n\t"
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"cmpsb\n\t"
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"je 1f\n\t"
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"movl $1,%%eax\n\t"
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"jl 1f\n\t"
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"negl %%eax\n"
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"1:"
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:"=a" (__res):"0" (0),"D" (cs),"S" (ct),"c" (count)
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/*:"si","di","cx"*/); /* TODO : constraint may be wrong*/
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return __res;
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}
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extern inline void * memchr(const void * cs,char c,int count)
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{
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int d0;
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register void * __res;
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if (!count)
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return NULL;
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__asm__ __volatile__("cld\n\t"
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"repne\n\t"
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"scasb\n\t"
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"je 1f\n\t"
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"movl $1,%0\n"
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"1:\tdecl %0"
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:"=D" (__res), "=&c" (d0)
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:"a" (c),"0" (cs),"1" (count)
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:"memory");
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return __res;
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}
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extern inline void * memset(void * s,int c,int count)
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{
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int d0, d1;
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__asm__ __volatile__("cld\n\t"
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"rep\n\t"
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"stosb"
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: "=&c" (d0), "=&D" (d1)
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:"a" (c),"1" (s),"0" (count)
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:"memory");
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return s;
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}
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#endif
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