Implementation of Common C string functions

Summarize the implementation code of commonly used string functions in C ~

// Strlen

Unsigned int strlenght (const char * SRC)

{

Unsigned int Len = 0;

While (* SRC ++)

{

Len ++;

}

Return Len;

}

 

// Strcat

Char * strlink (char * DEST, const char * SRC)

{

Char * temp = DEST;

While (* DEST ++ );

* Dest --; // move to the element before \ 0

While (* DEST ++ = * SRC ++ );

Return temp;

}

 

// Strcpy

Char * strcopy (char * DEST, const char * SRC)

{

Char * temp = DEST;

While (* DEST ++ = * SRC ++ );

Return temp;

}

 

// Strcmp

Int strcompare (const char * src1, const char * src2)

{

Int x = 0;

While (! (X = * src1-* src2) & * src1)

{

Src1 ++;

Src2 ++;

}

If (x> 0)

X = 1;

If (x <0)

X =-1;

Return X;

 

}