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string.h

#ifndef _LINUX_STRING_H_
#define _LINUX_STRING_H_

#include <linux/types.h>      /* for size_t */

#ifndef NULL
#define NULL ((void *) 0)
#endif

extern inline char * _dl_strcpy(char * dest,const char *src);
extern inline char * _dl_strncpy(char * dest,const char *src,size_t count);
extern inline char * _dl_strcat(char * dest,const char * src);
extern inline char * _dl_strncat(char * dest,const char * src,size_t count);
extern inline int _dl_strcmp(const char * cs,const char * ct);
extern inline int _dl_strncmp(const char * cs,const char * ct,size_t count);
extern inline char * _dl_strchr(const char * s,char c);
extern inline char * _dl_strrchr(const char * s,char c);
extern inline size_t _dl_strspn(const char * cs, const char * ct);
extern inline size_t _dl_strcspn(const char * cs, const char * ct);
extern inline char * _dl_strpbrk(const char * cs,const char * ct);
extern inline char * _dl_strstr(const char * cs,const char * ct);
extern inline size_t _dl_strlen(const char * s);
extern inline char * _dl_strtok(char * s,const char * ct);
extern inline void * _dl_memcpy(void * to, const void * from, size_t n);
extern inline void * _dl_memmove(void * dest,const void * src, size_t n);
extern inline int _dl_memcmp(const void * cs,const void * ct,size_t count);
extern inline void * _dl_memchr(const void * cs,char c,size_t count);
extern inline void * _dl_memset(void * s,char c,size_t count);

/*
 * This string-include defines all string functions as inline
 * functions. Use gcc. It also assumes ds=es=data space, this should be
 * normal. Most of the string-functions are rather heavily hand-optimized,
 * see especially strtok,strstr,str[c]spn. They should work, but are not
 * very easy to understand. Everything is done entirely within the register
 * set, making the functions fast and clean. String instructions have been
 * used through-out, making for "slightly" unclear code :-)
 *
 *          Copyright (C) 1991, 1992 Linus Torvalds
 */
 
extern inline char * _dl_strcpy(char * dest,const char *src)
{
__asm__("cld\n"
      "1:\tlodsb\n\t"
      "stosb\n\t"
      "testb %%al,%%al\n\t"
      "jne 1b"
      : /* no output */
      :"S" (src),"D" (dest):"si","di","ax","memory");
return dest;
}

extern inline char * _dl_strncpy(char * dest,const char *src,size_t count)
{
__asm__("cld\n"
      "1:\tdecl %2\n\t"
      "js 2f\n\t"
      "lodsb\n\t"
      "stosb\n\t"
      "testb %%al,%%al\n\t"
      "jne 1b\n\t"
      "rep\n\t"
      "stosb\n"
      "2:"
      : /* no output */
      :"S" (src),"D" (dest),"c" (count):"si","di","ax","cx","memory");
return dest;
}

extern inline char * _dl_strcat(char * dest,const char * src)
{
__asm__("cld\n\t"
      "repne\n\t"
      "scasb\n\t"
      "decl %1\n"
      "1:\tlodsb\n\t"
      "stosb\n\t"
      "testb %%al,%%al\n\t"
      "jne 1b"
      : /* no output */
      :"S" (src),"D" (dest),"a" (0),"c" (0xffffffff):"si","di","ax","cx");
return dest;
}

extern inline char * _dl_strncat(char * dest,const char * src,size_t count)
{
__asm__("cld\n\t"
      "repne\n\t"
      "scasb\n\t"
      "decl %1\n\t"
      "movl %4,%3\n"
      "1:\tdecl %3\n\t"
      "js 2f\n\t"
      "lodsb\n\t"
      "stosb\n\t"
      "testb %%al,%%al\n\t"
      "jne 1b\n"
      "2:\txorl %2,%2\n\t"
      "stosb"
      : /* no output */
      :"S" (src),"D" (dest),"a" (0),"c" (0xffffffff),"g" (count)
      :"si","di","ax","cx","memory");
return dest;
}

extern inline int _dl_strcmp(const char * cs,const char * ct)
{
register int __res;
__asm__("cld\n"
      "5:\tlodsb\n\t"
      "scasb\n\t"
      "jne 6f\n\t"
      "testb %%al,%%al\n\t"
      "jne 5b\n\t"
      "xorl %%eax,%%eax\n\t"
      "jmp 7f\n"
      "6:\tmovl $1,%%eax\n\t"
      "jb 7f\n\t"
      "negl %%eax\n"
      "7:"
      :"=a" (__res):"D" (cs),"S" (ct):"si","di");
return __res;
}

extern inline int _dl_strncmp(const char * cs,const char * ct,size_t count)
{
register int __res;
__asm__("cld\n"
      "1:\tdecl %3\n\t"
      "js 2f\n\t"
      "lodsb\n\t"
      "scasb\n\t"
      "jne 3f\n\t"
      "testb %%al,%%al\n\t"
      "jne 1b\n"
      "2:\txorl %%eax,%%eax\n\t"
      "jmp 4f\n"
      "3:\tmovl $1,%%eax\n\t"
      "jb 4f\n\t"
      "negl %%eax\n"
      "4:"
      :"=a" (__res):"D" (cs),"S" (ct),"c" (count):"si","di","cx");
return __res;
}

extern inline char * _dl_strchr(const char * s,char c)
{
register char * __res;
__asm__("cld\n\t"
      "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" (s),"0" (c):"si");
return __res;
}

extern inline char * _dl_strrchr(const char * s,char c)
{
register char * __res;
__asm__("cld\n\t"
      "movb %%al,%%ah\n"
      "1:\tlodsb\n\t"
      "cmpb %%ah,%%al\n\t"
      "jne 2f\n\t"
      "movl %%esi,%0\n\t"
      "decl %0\n"
      "2:\ttestb %%al,%%al\n\t"
      "jne 1b"
      :"=d" (__res):"0" (0),"S" (s),"a" (c):"ax","si");
return __res;
}

extern inline size_t _dl_strspn(const char * cs, const char * ct)
{
register char * __res;
__asm__("cld\n\t"
      "movl %4,%%edi\n\t"
      "repne\n\t"
      "scasb\n\t"
      "notl %%ecx\n\t"
      "decl %%ecx\n\t"
      "movl %%ecx,%%edx\n"
      "1:\tlodsb\n\t"
      "testb %%al,%%al\n\t"
      "je 2f\n\t"
      "movl %4,%%edi\n\t"
      "movl %%edx,%%ecx\n\t"
      "repne\n\t"
      "scasb\n\t"
      "je 1b\n"
      "2:\tdecl %0"
      :"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
      :"ax","cx","dx","di");
return __res-cs;
}

extern inline size_t _dl_strcspn(const char * cs, const char * ct)
{
register char * __res;
__asm__("cld\n\t"
      "movl %4,%%edi\n\t"
      "repne\n\t"
      "scasb\n\t"
      "notl %%ecx\n\t"
      "decl %%ecx\n\t"
      "movl %%ecx,%%edx\n"
      "1:\tlodsb\n\t"
      "testb %%al,%%al\n\t"
      "je 2f\n\t"
      "movl %4,%%edi\n\t"
      "movl %%edx,%%ecx\n\t"
      "repne\n\t"
      "scasb\n\t"
      "jne 1b\n"
      "2:\tdecl %0"
      :"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
      :"ax","cx","dx","di");
return __res-cs;
}

extern inline char * _dl_strpbrk(const char * cs,const char * ct)
{
register char * __res;
__asm__("cld\n\t"
      "movl %4,%%edi\n\t"
      "repne\n\t"
      "scasb\n\t"
      "notl %%ecx\n\t"
      "decl %%ecx\n\t"
      "movl %%ecx,%%edx\n"
      "1:\tlodsb\n\t"
      "testb %%al,%%al\n\t"
      "je 2f\n\t"
      "movl %4,%%edi\n\t"
      "movl %%edx,%%ecx\n\t"
      "repne\n\t"
      "scasb\n\t"
      "jne 1b\n\t"
      "decl %0\n\t"
      "jmp 3f\n"
      "2:\txorl %0,%0\n"
      "3:"
      :"=S" (__res):"a" (0),"c" (0xffffffff),"0" (cs),"g" (ct)
      :"ax","cx","dx","di");
return __res;
}

extern inline char * _dl_strstr(const char * cs,const char * ct)
{
register char * __res;
__asm__("cld\n\t" \
      "movl %4,%%edi\n\t"
      "repne\n\t"
      "scasb\n\t"
      "notl %%ecx\n\t"
      "decl %%ecx\n\t"  /* NOTE! This also sets Z if searchstring='' */
      "movl %%ecx,%%edx\n"
      "1:\tmovl %4,%%edi\n\t"
      "movl %%esi,%%eax\n\t"
      "movl %%edx,%%ecx\n\t"
      "repe\n\t"
      "cmpsb\n\t"
      "je 2f\n\t"       /* also works for empty string, see above */
      "xchgl %%eax,%%esi\n\t"
      "incl %%esi\n\t"
      "cmpb $0,-1(%%eax)\n\t"
      "jne 1b\n\t"
      "xorl %%eax,%%eax\n\t"
      "2:"
      :"=a" (__res):"0" (0),"c" (0xffffffff),"S" (cs),"g" (ct)
      :"cx","dx","di","si");
return __res;
}

extern inline size_t _dl_strlen(const char * s)
{
register int __res;
__asm__("cld\n\t"
      "repne\n\t"
      "scasb\n\t"
      "notl %0\n\t"
      "decl %0"
      :"=c" (__res):"D" (s),"a" (0),"0" (0xffffffff):"di");
return __res;
}

extern char * ___strtok;

extern inline char * _dl_strtok(char * s,const char * ct)
{
register char * __res;
__asm__("testl %1,%1\n\t"
      "jne 1f\n\t"
      "testl %0,%0\n\t"
      "je 8f\n\t"
      "movl %0,%1\n"
      "1:\txorl %0,%0\n\t"
      "movl $-1,%%ecx\n\t"
      "xorl %%eax,%%eax\n\t"
      "cld\n\t"
      "movl %4,%%edi\n\t"
      "repne\n\t"
      "scasb\n\t"
      "notl %%ecx\n\t"
      "decl %%ecx\n\t"
      "je 7f\n\t"             /* empty delimeter-string */
      "movl %%ecx,%%edx\n"
      "2:\tlodsb\n\t"
      "testb %%al,%%al\n\t"
      "je 7f\n\t"
      "movl %4,%%edi\n\t"
      "movl %%edx,%%ecx\n\t"
      "repne\n\t"
      "scasb\n\t"
      "je 2b\n\t"
      "decl %1\n\t"
      "cmpb $0,(%1)\n\t"
      "je 7f\n\t"
      "movl %1,%0\n"
      "3:\tlodsb\n\t"
      "testb %%al,%%al\n\t"
      "je 5f\n\t"
      "movl %4,%%edi\n\t"
      "movl %%edx,%%ecx\n\t"
      "repne\n\t"
      "scasb\n\t"
      "jne 3b\n\t"
      "decl %1\n\t"
      "cmpb $0,(%1)\n\t"
      "je 5f\n\t"
      "movb $0,(%1)\n\t"
      "incl %1\n\t"
      "jmp 6f\n"
      "5:\txorl %1,%1\n"
      "6:\tcmpb $0,(%0)\n\t"
      "jne 7f\n\t"
      "xorl %0,%0\n"
      "7:\ttestl %0,%0\n\t"
      "jne 8f\n\t"
      "movl %0,%1\n"
      "8:"
      :"=b" (__res),"=S" (___strtok)
      :"0" (___strtok),"1" (s),"g" (ct)
      :"ax","cx","dx","di","memory");
return __res;
}

extern inline void * _dl_memcpy(void * to, const void * from, size_t n)
{
__asm__("cld\n\t"
      "movl %%edx, %%ecx\n\t"
      "shrl $2,%%ecx\n\t"
      "rep ; movsl\n\t"
      "testb $1,%%dl\n\t"
      "je 1f\n\t"
      "movsb\n"
      "1:\ttestb $2,%%dl\n\t"
      "je 2f\n\t"
      "movsw\n"
      "2:\n"
      : /* no output */
      :"d" (n),"D" ((long) to),"S" ((long) from)
      : "cx","di","si","memory");
return (to);
}

extern inline void * _dl_memmove(void * dest,const void * src, size_t n)
{
if (dest<src)
__asm__("cld\n\t"
      "rep\n\t"
      "movsb"
      : /* no output */
      :"c" (n),"S" (src),"D" (dest)
      :"cx","si","di");
else
__asm__("std\n\t"
      "rep\n\t"
      "movsb\n\t"
      "cld"
      : /* no output */
      :"c" (n),
       "S" (n-1+(const char *)src),
       "D" (n-1+(char *)dest)
      :"cx","si","di","memory");
return dest;
}

extern inline int _dl_memcmp(const void * cs,const void * ct,size_t count)
{
register int __res;
__asm__("cld\n\t"
      "repe\n\t"
      "cmpsb\n\t"
      "je 1f\n\t"
      "movl $1,%%eax\n\t"
      "jb 1f\n\t"
      "negl %%eax\n"
      "1:"
      :"=a" (__res):"0" (0),"D" (cs),"S" (ct),"c" (count)
      :"si","di","cx");
return __res;
}

extern inline void * _dl_memchr(const void * cs,char c,size_t count)
{
register void * __res;
if (!count)
      return NULL;
__asm__("cld\n\t"
      "repne\n\t"
      "scasb\n\t"
      "je 1f\n\t"
      "movl $1,%0\n"
      "1:\tdecl %0"
      :"=D" (__res):"a" (c),"D" (cs),"c" (count)
      :"cx");
return __res;
}

extern inline void * _dl_memset(void * s,char c,size_t count)
{
__asm__("cld\n\t"
      "rep\n\t"
      "stosb"
      : /* no output */
      :"a" (c),"D" (s),"c" (count)
      :"cx","di","memory");
return s;
}

#endif

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