str_buf *
str_buf_concat(str_buf * buf1, str_buf * buf2)
{
str_buf * buf;
if ( buf1 == NULL ) {
if ( buf2 == NULL )
buf = str_buf_alloc(0);
else
buf = str_buf_alloc_substr(buf2->data, buf2->length);
}
else if ( buf2 == NULL ) {
buf = str_buf_alloc_substr(buf1->data, buf1->length);
}
else {
buf = str_buf_alloc( buf1->length + buf2->length );
if ( buf == NULL ) return NULL ;
strcpy(buf->data, buf1->data);
strcpy(buf->data + buf1->length, buf2->data);
buf->length = buf->size;
}
return buf;
}
void
test_str_buf_alloc_substr(){
str_buf *b1;
str_buf *b2;
b1 = str_buf_alloc_substr("abcdef",4);
b2 = str_buf_alloc_substr("abcdef",4);
assert(strcmp(str_buf_head(b1) , "abcd")==0);
assert(str_buf_equals(b1,b2));
assert(str_buf_len(b1)==4);
str_buf_free(b1);
str_buf_free(b2);
}
str_buf *
str_buf_alloc_str(const char * str)
{
return str_buf_alloc_substr( str, strlen(str) );
}
