str_midassign.c

Go to the documentation of this file.

/* mid$ statement */

#include "fb.h"

FBCALL void fb_StrAssignMid( FBSTRING *dst, ssize_t start, ssize_t len, FBSTRING *src )
{
        ssize_t src_len, dst_len;

        FB_STRLOCK();

    if( (dst == NULL) || (dst->data == NULL) || (FB_STRSIZE( dst ) == 0) )
    {
        fb_hStrDelTemp_NoLock( src );
        fb_hStrDelTemp_NoLock( dst );
        FB_STRUNLOCK();
        return;
    }

    if( (src == NULL) || (src->data == NULL) || (FB_STRSIZE( src ) == 0) ) {
        fb_hStrDelTemp_NoLock( src );
        fb_hStrDelTemp_NoLock( dst );
        FB_STRUNLOCK();
        return ;
    }

        src_len = FB_STRSIZE( src );
        dst_len = FB_STRSIZE( dst );

        if( (start > 0) && (start <= dst_len) && (len != 0) )
    {
                --start;

                if( (len < 0) || (len > src_len) )
                        len = src_len;

        if( start + len > dst_len )
                len = (dst_len - start);

                memcpy( dst->data + start, src->data, len );
    }

        /* del if temp */
        fb_hStrDelTemp_NoLock( src );
    fb_hStrDelTemp_NoLock( dst );

        FB_STRUNLOCK();
}