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406 lines
7.4 KiB
406 lines
7.4 KiB
#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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__asm__("cld\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" (src),"D" (dest));
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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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__asm__("cld\n"
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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" (src),"D" (dest),"c" (count));
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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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__asm__("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" (src),"D" (dest),"a" (0),"c" (0xffffffff));
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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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__asm__("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 %4,%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" (src),"D" (dest),"a" (0),"c" (0xffffffff),"g" (count)
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);
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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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register int __res __asm__("ax");
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__asm__("cld\n"
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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:\tmovl $1,%%eax\n\t"
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"jl 3f\n\t"
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"negl %%eax\n"
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"3:"
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:"=a" (__res):"D" (cs),"S" (ct));
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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 __asm__("ax");
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__asm__("cld\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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"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:\tmovl $1,%%eax\n\t"
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"jl 4f\n\t"
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"negl %%eax\n"
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"4:"
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:"=a" (__res):"D" (cs),"S" (ct),"c" (count));
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return __res;
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}
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extern inline char * strchr(const char * s,char c)
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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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"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" (s),"0" (c));
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return __res;
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}
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extern inline char * strrchr(const char * s,char c)
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{
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register char * __res __asm__("dx");
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__asm__("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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"movl %%esi,%0\n\t"
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"decl %0\n"
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"2:\ttestb %%al,%%al\n\t"
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"jne 1b"
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:"=d" (__res):"0" (0),"S" (s),"a" (c));
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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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);
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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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);
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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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);
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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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);
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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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register int __res ;
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__asm__("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" (s),"a" (0),"0" (0xffffffff));
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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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);
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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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__asm__("cld\n\t"
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"rep\n\t"
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"movsb"
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::"c" (n),"S" (src),"D" (dest)
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);
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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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if (dest<src)
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__asm__("cld\n\t"
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"rep\n\t"
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"movsb"
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::"c" (n),"S" (src),"D" (dest)
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);
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else
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__asm__("std\n\t"
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"rep\n\t"
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"movsb"
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::"c" (n),"S" (src+n-1),"D" (dest+n-1)
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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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);
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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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register void * __res __asm__("di");
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if (!count)
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return NULL;
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__asm__("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):"a" (c),"D" (cs),"c" (count)
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);
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return __res;
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}
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extern inline void * memset(void * s,char c,int count)
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{
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__asm__("cld\n\t"
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"rep\n\t"
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"stosb"
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::"a" (c),"D" (s),"c" (count)
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);
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return s;
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}
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#endif
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