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* safepath.c (bad_proc): New static variable; regular
expression that matches paths under /proc that traverse
dangerous symlinks.
(bad_proc_rx): Compiled version of above regex.
(abs_path_check): Replace ad-hoc path match with regexec call.
(safepath_init, safepath_deinit): New functions needed because
have to compile a regular expression one time, and then
keep using it. We could do this lazily but then we need
pthread_once to make things thread safe.
* safepath.h (safepath_init, safepath_cleanup): Declared.
* testsp.c (main): Call safepath_init and safepath_cleanup.
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