C parameter question

Ok, so I am currently in the process in writing a C library for a small kernel I am making for fun, and my question is:
Is it possible to have a function specify only one parameter in the code and have any extra parameters put into an array, let's call it extra[].
Here is the code I have:
unsigned int k_printf(char *message)
char *vidmem = (char *) 0xb8000;
unsigned int i = 0;
i = (line*80*2);
while(*message != 0) {
if(*message=='\n') {
line++;
i = (line*80*2);
*message++;
else if(*message=='%s') {
else {
vidmem[i] = *message;
*message++;
i++;
vidmemcount++;
vidmem[i] = WHITE_TXT;
i++;
vidmemcount++;
line++;
return 1;
I am currently trying to make a close but less powerful printf() equivalent. For example:
printf("My name is %s and my friends name is %s", myname, friendsname);
I want to be able to make an extra[] array that stores myname and friendsname in extra[0] and extra[1]. Is this possible?

ewaller wrote:
itsbrad212 wrote:
Ok, so I am currently in the process in writing a C library for a small kernel I am making for fun, and my question is:
Is it possible to have a function specify only one parameter in the code and have any extra parameters put into an array, let's call it extra[].
Here is the code I have:
unsigned int k_printf(char *message)
char *vidmem = (char *) 0xb8000;
unsigned int i = 0;
i = (line*80*2);
while(*message != 0) {
if(*message=='\n') {
line++;
i = (line*80*2);
*message++;
else if(*message=='%s') {
else {
vidmem[i] = *message;
*message++;
i++;
vidmemcount++;
vidmem[i] = WHITE_TXT;
i++;
vidmemcount++;
line++;
return 1;
I am currently trying to make a close but less powerful printf() equivalent. For example:
printf("My name is %s and my friends name is %s", myname, friendsname);
I want to be able to make an extra[] array that stores myname and friendsname in extra[0] and extra[1]. Is this possible?
Okay, here goes:
where is line defined, allocated, initialized?
where is vidmemcount defined, allocated, initialized? what is it used for?
Avoid *80*2. Especially in multiple places. Use a #define in case you change the size latter.
Even better, how about creating records on the heap using malloc and then keeping an array of references to the records.[Edit :: Never mind -- I see what you are up to. Ignore this]
Rather than :
while(*message != 0) {
if(*message=='\n') {
line++;
i = (line*80*2);
*message++;
else if(*message=='%s') {
else {
vidmem[i] = *message;
*message++;
i++;
vidmemcount++;
vidmem[i] = WHITE_TXT;
i++;
vidmemcount++;
How about :
char* vm = vidmem;
while ( *message)
if ((*message)=='\n')
vm=vidmem+SPAN * (++line);
message++;
else
*(vm++)=*(message++);
*(vm++)=WHITE_TXT;
edit : fixed bug in my code
Thanks for the tips! Any speed improvement whatsoever is crucial when doing things like this.
Here are those defined at the beginning of the functions.h file:
unsigned int line = 0;
char *vidmem = (char *) 0xb8000;
unsigned int vidmemcount = 0;

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I get the error: A number is required here.
And when I try this:
{spCSSReportNCounts1;1.DOUNum} = [{?Pm-@DOUNum}]
I get the error: A number range is required here.
Which is the same error I get when i switch out the = for IN:
{spCSSReportNCounts1;1.DOUNum} In {?Pm-@DOUNum}

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