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/*

 *  linux/lib/string.c

 *

 *  Copyright (C) 1991, 1992  Linus Torvalds

 */

/*

 * stupid library routines.. The optimized versions should generally be found

 * as inline code in <asm-xx/string.h>

 *

 * These are buggy as well..

 */

#include <linux/types.h>

#include <linux/string.h>

char * ___strtok = NULL;

#ifndef __HAVE_ARCH_STRCPY

char * strcpy(char * dest,const char *src)

{

        char *tmp = dest;

        while ((*dest++ = *src++) != '\0')

                /* nothing */;

        return tmp;

}

#endif

#ifndef __HAVE_ARCH_STRNCPY

char * strncpy(char * dest,const char *src,size_t count)

{

        char *tmp = dest;

        while (count-- && (*dest++ = *src++) != '\0')

                /* nothing */;

        return tmp;

}

#endif

#ifndef __HAVE_ARCH_STRCAT

char * strcat(char * dest, const char * src)

{

        char *tmp = dest;

        while (*dest)

                dest++;

        while ((*dest++ = *src++) != '\0')

                ;

        return tmp;

}

#endif

#ifndef __HAVE_ARCH_STRNCAT

char * strncat(char *dest, const char *src, size_t count)

{

        char *tmp = dest;

        if (count) {

                while (*dest)

                        dest++;

                while ((*dest++ = *src++)) {

                        if (--count == 0) {

                                *dest = '\0';

                                break;

                        }

                }

        }

        return tmp;

}

#endif

#ifndef __HAVE_ARCH_STRCMP

int strcmp(const char * cs,const char * ct)

{

        register signed char __res;

        while (1) {

                if ((__res = *cs - *ct++) != 0 || !*cs++)

                        break;

        }

        return __res;

}

#endif

#ifndef __HAVE_ARCH_STRNCMP

int strncmp(const char * cs,const char * ct,size_t count)

{

        register signed char __res = 0;

        while (count) {

                if ((__res = *cs - *ct++) != 0 || !*cs++)

                        break;

                count--;

        }

        return __res;

}

#endif

#ifndef __HAVE_ARCH_STRCHR

char * strchr(const char * s, int c)

{

        for(; *s != (char) c; ++s)

                if (*s == '\0')

                        return NULL;

        return (char *) s;

}

#endif

#ifndef __HAVE_ARCH_STRRCHR

char * strrchr(const char * s, int c)

{

       const char *p = s + strlen(s);

       do {

           if (*p == (char)c)

               return (char *)p;

       } while (--p >= s);

       return NULL;

}

#endif

#ifndef __HAVE_ARCH_STRLEN

size_t strlen(const char * s)

{

        const char *sc;

        for (sc = s; *sc != '\0'; ++sc)

                /* nothing */;

        return sc - s;

}

#endif

#ifndef __HAVE_ARCH_STRNLEN

size_t strnlen(const char * s, size_t count)

{

        const char *sc;

        for (sc = s; count-- && *sc != '\0'; ++sc)

                /* nothing */;

        return sc - s;

}

#endif

#ifndef __HAVE_ARCH_STRSPN

size_t strspn(const char *s, const char *accept)

{

        const char *p;

        const char *a;

        size_t count = 0;

        for (p = s; *p != '\0'; ++p) {

                for (a = accept; *a != '\0'; ++a) {

                        if (*p == *a)

                                break;

                }

                if (*a == '\0')

                        return count;

                ++count;

        }

        return count;

}

#endif

#ifndef __HAVE_ARCH_STRPBRK

char * strpbrk(const char * cs,const char * ct)

{

        const char *sc1,*sc2;

        for( sc1 = cs; *sc1 != '\0'; ++sc1) {

                for( sc2 = ct; *sc2 != '\0'; ++sc2) {

                        if (*sc1 == *sc2)

                                return (char *) sc1;

                }

        }

        return NULL;

}

#endif

#ifndef __HAVE_ARCH_STRTOK

char * strtok(char * s,const char * ct)

{

        char *sbegin, *send;

        sbegin  = s ? s : ___strtok;

        if (!sbegin) {

                return NULL;

        }

        sbegin += strspn(sbegin,ct);

        if (*sbegin == '\0') {

                ___strtok = NULL;

                return( NULL );

        }

        send = strpbrk( sbegin, ct);

        if (send && *send != '\0')

                *send++ = '\0';

        ___strtok = send;

        return (sbegin);

}

#endif

#ifndef __HAVE_ARCH_MEMSET

void * memset(void * s,int c,size_t count)

{

        char *xs = (char *) s;

        while (count--)

                *xs++ = c;

        return s;

}

#endif

#ifndef __HAVE_ARCH_BCOPY

char * bcopy(const char * src, char * dest, int count)

{

        char *tmp = dest;

        while (count--)

                *tmp++ = *src++;

        return dest;

}

#endif

#ifndef __HAVE_ARCH_MEMCPY

void * memcpy(void * dest,const void *src,size_t count)

{

        char *tmp = (char *) dest, *s = (char *) src;

        while (count--)

                *tmp++ = *s++;

        return dest;

}

#endif

#ifndef __HAVE_ARCH_MEMMOVE

void * memmove(void * dest,const void *src,size_t count)

{

        char *tmp, *s;

        if (dest <= src) {

                tmp = (char *) dest;

                s = (char *) src;

                while (count--)

                        *tmp++ = *s++;

                }

        else {

                tmp = (char *) dest + count;

                s = (char *) src + count;

                while (count--)

                        *--tmp = *--s;

                }

        return dest;

}

#endif

#ifndef __HAVE_ARCH_MEMCMP

int memcmp(const void * cs,const void * ct,size_t count)

{

        const unsigned char *su1, *su2;

        signed char res = 0;

        for( su1 = cs, su2 = ct; 0 < count; ++su1, ++su2, count--)

                if ((res = *su1 - *su2) != 0)

                        break;

        return res;

}

#endif

/*

 * find the first occurrence of byte 'c', or 1 past the area if none

 */

#ifndef __HAVE_ARCH_MEMSCAN

void * memscan(void * addr, int c, size_t size)

{

        unsigned char * p = (unsigned char *) addr;

        while (size) {

                if (*p == c)

                        return (void *) p;

                p++;

                size--;

        }

        return (void *) p;

}

#endif

#ifndef __HAVE_ARCH_STRSTR

char * strstr(const char * s1,const char * s2)

{

        int l1, l2;

        l2 = strlen(s2);

        if (!l2)

                return (char *) s1;

        l1 = strlen(s1);

        while (l1 >= l2) {

                l1--;

                if (!memcmp(s1,s2,l2))

                        return (char *) s1;

                s1++;

        }

        return NULL;

}

#endif