Re: [brlcad-devel] Question on bu_vls (working 32-bit vls failure)

brlcad Wed, 23 May 2012 11:44:33 -0700

On May 23, 2012, at 12:23 PM, Tom Browder <[email protected]> wrote:

I see no function to deal with changing individual bu_vls characters.
Have I just missed them or should I just access the bu_vls string
directly?

It's easy enough and common in the code to just directly access the string. Example:

int main(int ac, char *av[]) {

int i;

struct bu_vls vls = BU_VLS_INIT_ZERO;

bu_vls_printf(&vls, "hello");

for (i=0; i < bu_vls_strlen(&vls); i++) {

printf("The %d char is [%c]\n", i, bu_vls_addr(&vls)[i]);

bu_vls_addr(&vls)[i] += 4;

}

for (i=0; i < bu_vls_strlen(&vls); i++) {

printf("The %d char is [%c]\n", i, bu_vls_addr(&vls)[i]);

}

return 0;

}

Maybe we need a function like bu_vls_readc (for reading) and
bu_vls_exchc (for substituting).

The VLS interface intentionally tries to mirror libc as much as possible, treating the vls buffer both as a stream (ala FILE*) and a string (ala char*). In that light, the function that pairs with the existing bu_vls_putc() call would be a bu_vls_getc() call. There's no pairing for replacing characters in libc (unless you count strtok() or strchr()) since you usually just index into the string and modify.

Cheers!

Sean

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Re: [brlcad-devel] Question on bu_vls (working 32-bit vls failure)

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