1 files changed, 405 insertions, 0 deletions
diff --git a/linux/include/string.h b/linux/include/string.h
new file mode 100644
index 0000000..05a6d9c
--- /dev/null
+++ b/linux/include/string.h
@@ -0,0 +1,405 @@
+#ifndef _STRING_H_
+#define _STRING_H_
+
+#ifndef NULL
+#define NULL ((void *) 0)
+#endif
+
+#ifndef _SIZE_T
+#define _SIZE_T
+typedef unsigned int size_t;
+#endif
+
+extern char * strerror(int errno);
+
+/*
+ * 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 :-)
+ *
+ *		(C) 1991 Linus Torvalds
+ */
+ 
+extern inline char * strcpy(char * dest,const char *src)
+{
+__asm__("cld\n"
+	"1:\tlodsb\n\t"
+	"stosb\n\t"
+	"testb %%al,%%al\n\t"
+	"jne 1b"
+	::"S" (src),"D" (dest):"si","di","ax");
+return dest;
+}
+
+extern inline char * strncpy(char * dest,const char *src,int 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:"
+	::"S" (src),"D" (dest),"c" (count):"si","di","ax","cx");
+return dest;
+}
+
+extern inline char * 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"
+	::"S" (src),"D" (dest),"a" (0),"c" (0xffffffff):"si","di","ax","cx");
+return dest;
+}
+
+extern inline char * strncat(char * dest,const char * src,int 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"
+	::"S" (src),"D" (dest),"a" (0),"c" (0xffffffff),"g" (count)
+	:"si","di","ax","cx");
+return dest;
+}
+
+extern inline int strcmp(const char * cs,const char * ct)
+{
+register int __res __asm__("ax");
+__asm__("cld\n"
+	"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:\tmovl $1,%%eax\n\t"
+	"jl 3f\n\t"
+	"negl %%eax\n"
+	"3:"
+	:"=a" (__res):"D" (cs),"S" (ct):"si","di");
+return __res;
+}
+
+extern inline int strncmp(const char * cs,const char * ct,int count)
+{
+register int __res __asm__("ax");
+__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"
+	"jl 4f\n\t"
+	"negl %%eax\n"
+	"4:"
+	:"=a" (__res):"D" (cs),"S" (ct),"c" (count):"si","di","cx");
+return __res;
+}
+
+extern inline char * strchr(const char * s,char c)
+{
+register char * __res __asm__("ax");
+__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 * strrchr(const char * s,char c)
+{
+register char * __res __asm__("dx");
+__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 int strspn(const char * cs, const char * ct)
+{
+register char * __res __asm__("si");
+__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 int strcspn(const char * cs, const char * ct)
+{
+register char * __res __asm__("si");
+__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 * strpbrk(const char * cs,const char * ct)
+{
+register char * __res __asm__("si");
+__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 * strstr(const char * cs,const char * ct)
+{
+register char * __res __asm__("ax");
+__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 int strlen(const char * s)
+{
+register int __res __asm__("cx");
+__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 * strtok(char * s,const char * ct)
+{
+register char * __res __asm__("si");
+__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");
+return __res;
+}
+
+extern inline void * memcpy(void * dest,const void * src, int n)
+{
+__asm__("cld\n\t"
+	"rep\n\t"
+	"movsb"
+	::"c" (n),"S" (src),"D" (dest)
+	:"cx","si","di");
+return dest;
+}
+
+extern inline void * memmove(void * dest,const void * src, int n)
+{
+if (dest<src)
+__asm__("cld\n\t"
+	"rep\n\t"
+	"movsb"
+	::"c" (n),"S" (src),"D" (dest)
+	:"cx","si","di");
+else
+__asm__("std\n\t"
+	"rep\n\t"
+	"movsb"
+	::"c" (n),"S" (src+n-1),"D" (dest+n-1)
+	:"cx","si","di");
+return dest;
+}
+
+extern inline int memcmp(const void * cs,const void * ct,int count)
+{
+register int __res __asm__("ax");
+__asm__("cld\n\t"
+	"repe\n\t"
+	"cmpsb\n\t"
+	"je 1f\n\t"
+	"movl $1,%%eax\n\t"
+	"jl 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 * memchr(const void * cs,char c,int count)
+{
+register void * __res __asm__("di");
+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 * memset(void * s,char c,int count)
+{
+__asm__("cld\n\t"
+	"rep\n\t"
+	"stosb"
+	::"a" (c),"D" (s),"c" (count)
+	:"cx","di");
+return s;
+}
+
+#endif