Hello Randy,
Sorry for the language errors, English is not my Native language, so I
make these stupid errors...
> > + * get_map_option - Parse integer from an option map
> The @param lines (below) need to go here, immediately following the
> function short description (the line above). No intervening blank
> lines.
OK, I will adapt that.
> > +int get_map_option(const char *str, const char *key, int *pint)
> > +{
> > + char buf[COMMAND_LINE_SIZE];
>
> COMMAND_LINE_SIZE varies from 256 to 2048, depending on $ARCH.
> That's a bit too much to declare on a function's local stack --
> unless you are very certain of the call tree to this point and
> that the total stack size is safe. Can you just kmalloc() this
> buf?
I know it is big on a 4k stack, and I also think it is not very nice...
But kmalloc() panics the kernel if I do it as soon as in the __setup() code.
The problem is that the original string may not be modified by the
cmdline-parser, and I do not know the length of the command up front,
(except that it cannot be longer than this define). Allocating a
global buffer is not safe and needs locking. So actually only what
left for me was the stack... or rewrite the used C-library-routines
completely myself, for this purpose only, which is also not nice.
I hope someone could point to me to another possibilty, that I did not
think of yet.
Kind Regards,
Remy
>
> > + char *p, *substr;
> > + int found = 0;
> > +
> > + /* We must copy the string to the stack, because strsep()
> > + changes it.*/
> > + strncpy(buf, str, COMMAND_LINE_SIZE);
> > + buf[COMMAND_LINE_SIZE-1] = '\0';
> > +
> > + p = buf;
> > + substr = strsep(&p, ",");
> > + while ((!found) && (substr != NULL)) {
> > + if (strlen(substr) != 0) {
> > + if (key == NULL) {
> > + /* Check for the absence of any ':' */
> > + if (strchr(substr, ':') == NULL) {
> > + sscanf(substr, "%d", pint);
> > + found = 1;
> > + }
> > + } else {
> > + /* check if the first part of the key matches */
> > + if (!strncmp(substr, key, strlen(key))) {
> > + substr += strlen(key);
> > + /* Now the next char must be a ':',
> > + if not, search for the next match */
> > + if (*substr == ':') {
> > + substr++;
> > + sscanf(substr, "%d", pint);
> > + found = 1;
> > + }
> > + }
> > + }
> > + }
> > + substr = strsep(&p, ",");
> > + }
> > + return found;
> > +}
>
> ---
> ~Randy
>
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