On 06/20/2012 05:21 PM, [email protected] wrote: > > ---- Ben Noordhuis <[email protected]> wrote: >> On Wed, Jun 20, 2012 at 4:35 PM, <[email protected]> wrote: >>> Hi, >>> >>> I am working on a module, and I get one of the SSL envvars, >>> SSL_CLIENT_CERT, using apr_table_get() into a const char *. >>> >>> The client cert char string returned has the extra beginning line >>> (-----BEGIN CERTIFICATE-----) and ending line (-----END CERTIFICATE-----), >>> but I need to remove both of those lines for a call that I need to make. >>> >>> I have to admit, I'm a bit (a lot) rusty with 'C', and I guess I could do >>> something like: >>> >>> strpy(original_cert, original_cert+27); >>> >>> and then set the ending position to \0 (to terminate the char string >>> early), but since with this is a module, and I'm working with a pointer to >>> the memory pool, I'm kind of worried that doing stuff like that would mess >>> things up (e.g., garbage collection, since the string is now shorter by 'x' >>> bytes. >>> >>> So, from an Apache module development standpoint, what would be the safest >>> way to do this (strip a string of chars from the beginning and end)? >> >> Make a copy with apr_strdup(), then mutate the copy. >> >> APR has utility functions for manipulating strings, like apr_strtok(). >> Have a look at apr_strings.h. > > Hi, > > Thanks. I've been using those, and I can eliminate the beginning line, but > how can I eliminate the ending line? It seems that I can't just store a '\0' > into the end of the char string. > > Will apr_cpystrn() automatically terminate the destination char string, i.e., > if I do something like: > > apr_cpystrn(cert_without_ending, cert_string, strlen(cert_string)-10); > > will the cert_without_ending char string get terminated properly with \0? > > Jim Yes, apr_cpystrn includes a terminating null char, as mentioned in the documentation; http://apr.apache.org/docs/apr/1.4/group__apr__strings.html#ga69700a825e82dd646f9f166599040431
With regards, Daniel.
