str_concatassign.c

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/* string concat and assigning (s = s + expr) function */

#include "fb.h"

FBCALL void *fb_StrConcatAssign
        (
                void *dst,
                ssize_t dst_size,
                void *src,
                ssize_t src_size,
                int fillrem
        )
{
        FBSTRING *dstr;
        const char *src_ptr;
        ssize_t src_len, dst_len;

        if( dst == NULL )
        {
                /* delete temp? */
                if( src_size == -1 )
                        fb_hStrDelTemp( (FBSTRING *)src );

                return dst;
        }

        /* src */
        FB_STRSETUP_FIX( src, src_size, src_ptr, src_len );

        /* not NULL? */
        if( src_len > 0 )
        {
                /* is dst var-len? */
                if( dst_size == -1 )
                {
                dstr = (FBSTRING *)dst;
                dst_len = FB_STRSIZE( dst );

                        fb_hStrRealloc( dstr, dst_len+src_len, FB_TRUE );

                        fb_hStrCopy( &dstr->data[dst_len], src_ptr, src_len );
                }
                else
                {
                        dst_len = strlen( (char *)dst );

                        /* don't check byte ptr's */
                        if( dst_size > 0 )
                        {
                                --dst_size;                                                     /* less the null-term */

                                if( src_len > dst_size - dst_len )
                                        src_len = dst_size - dst_len;
                        }

                        fb_hStrCopy( &(((char *)dst)[dst_len]), src_ptr, src_len );

                        /* don't check byte ptr's */
                        if( (fillrem != 0) && (dst_size > 0) )
                        {
                                /* fill reminder with null's */
                                dst_size -= (dst_len + src_len);
                                if( dst_size > 0 )
                                        memset( &(((char *)dst)[dst_len+src_len]), 0, dst_size );
                        }
                }
        }


        /* delete temp? */
        if( src_size == -1 )
                fb_hStrDelTemp( (FBSTRING *)src );

        return dst;
}