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/* ISC license. */
#include <sys/types.h>
#include <skalibs/sgetopt.h>
#include <skalibs/bytestr.h>
#include <skalibs/strerr2.h>
#include <skalibs/stralloc.h>
#include <skalibs/env.h>
#include <skalibs/djbunix.h>
#include <execline/execline.h>
#define USAGE "emptyenv [ -p | -c | -o | -P ] prog..."
static void cleanupenv (char const *const *argv, char const *const *envp)
{
stralloc sa = STRALLOC_ZERO ;
if (!pathexec_env("!", 0) || !pathexec_env("?", 0)) goto err ;
#ifdef EXECLINE_OLD_VARNAMES
if (!pathexec_env("LASTPID", 0) || !pathexec_env("LASTEXITCODE", 0)) goto err ;
#endif
for (; *envp ; envp++)
{
char const *s = *envp ;
sa.len = 0 ;
if (!str_diffn(s, "ELGETOPT_", 9)
|| !str_diffn(s, "EXECLINE_", 9)
|| !str_diffn(s, "FD", 2)
|| (s[0] == '#')
|| ((s[0] >= '0') && (s[0] <= '9')))
if (!stralloc_catb(&sa, s, str_chr(s, '='))
|| !stralloc_0(&sa)
|| !pathexec_env(sa.s, 0))
goto err ;
}
stralloc_free(&sa) ;
pathexec(argv) ;
strerr_dieexec(111, argv[0]) ;
err:
strerr_diefu1sys(111, "clean up environment") ;
}
int main (int argc, char const *const *argv, char const *const *envp)
{
int flagpath = 0, flagcleanup = 0, flagopt = 0, flagpos = 0 ;
PROG = "emptyenv" ;
{
subgetopt_t l = SUBGETOPT_ZERO ;
for (;;)
{
register int opt = subgetopt_r(argc, argv, "pcoP", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'p' : flagpath = 1 ; break ;
case 'c' : flagcleanup = 1 ; break ;
case 'o' : flagopt = 1 ; break ;
case 'P' : flagpos = 1 ; break ;
default : strerr_dieusage(100, USAGE) ;
}
}
argc -= l.ind ; argv += l.ind ;
}
if (!argc) strerr_dieusage(100, USAGE) ;
if (flagcleanup) cleanupenv(argv, envp) ;
else if (!flagopt && !flagpos)
{
char const *newenv[2] = { 0, 0 } ;
if (flagpath)
for (; *envp ; envp++)
if (!str_diffn(*envp, "PATH=", 5))
{
newenv[0] = *envp ;
break ;
}
pathexec_run(argv[0], argv, newenv) ;
}
else
{
static char const *const list[12] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "#", "ELGETOPT_" } ;
stralloc sa = STRALLOC_ZERO ;
size_t envlen = env_len(envp) ;
int n = el_popenv(&sa, envp, envlen, flagpos ? list : list + 11, 11 * flagpos + flagopt) ;
if (n < 0) strerr_diefu1sys(111, "pop current execline environment") ;
{
char const *v[envlen - n + 1] ;
if (!env_make(v, envlen-n, sa.s, sa.len)) strerr_diefu1sys(111, "env_make") ;
v[envlen-n] = 0 ;
pathexec_run(argv[0], argv, v) ;
}
stralloc_free(&sa) ;
}
strerr_dieexec(111, argv[0]) ;
}
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