Date: Wed, 14 Apr 2004 16:35:02 -0600 From: Brandon Erhart <berhart@ErhartGroup.COM> To: Craig Rodrigues <rodrigc@crodrigues.org> Cc: freebsd-hackers@freebsd.org Subject: Re: C code for parsing rc.conf? Message-ID: <6.0.2.0.2.20040414162810.01c8cb48@mx1.erhartgroup.com> In-Reply-To: <20040414215601.GA3923@crodrigues.org> References: <20040414215601.GA3923@crodrigues.org>
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Not that I know of, but it should be a breeze to write a simple parsing engine.
Just ignore all lines starting with a '#', and break at the '=' sign. The
first part would be your variable name, the last part your value for it.
Then just display variables and their names, and maybe parse the variable
names so you can assign meaningful help information to them.
I didn't compile this, not sure if it'll work, but it'll give you a good
idea as to what your code may look like ..
int main(int argc, char **argv)
{
FILE *rc;
char buf[512];
if ( (rc=fopen("/etc/rc.conf", "r")) == NULL)
{
perror("fopen()");
exit(EXIT_FAILURE);
}
while (fgets(buf, sizeof(buf), rc) != NULL)
{
char *eq_ptr, var_name[256], var_value[256];
some_function_to_strip_trailing_and_pre_whitespace(buf);
/* this function will just strip pre- and trailing whitespace from the line */
if (!strlen(buf)) continue; /* blank line */
if (buf[0] == '#') continue; /* comment line */
if ( (eq_ptr = index(buf, '=')) == NULL) continue; /* no equal
sign */
*eq_ptr = '\0';
memset(var_name, 0, 256);
memset(var_value, 0, 256);
if (!strlen(buf) || !strlen(eq_ptr+1)) continue; /* either
the variable name or the value was empty */
strncpy(var_name, buf, 255);
strncpy(var_value, eq_ptr+1, 255);
printf("%s=%s\n", var_name, var_value);
}
exit(EXIT_SUCCESS);
}
At 03:56 PM 4/14/2004, you wrote:
>Hi,
>
>Is there a C library that comes with FreeBSD which
>can be used to parse, append to, and validate
>rc.conf?
>
>I'd like to customize some of the settings in /etc/rc.conf
>with my own GUI-based program. It's not too hard
>to write something on my own, but I was wondering
>if a reusable library existed in FreeBSD 4.x or 5.x for doing this.
>
>Thanks.
>
>--
>Craig Rodrigues
>http://crodrigues.org
>rodrigc@crodrigues.org
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>freebsd-hackers@freebsd.org mailing list
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