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/* ISC license. */
#include <sys/types.h>
#include <string.h>
#include <errno.h>
#include <skalibs/types.h>
#include <skalibs/sgetopt.h>
#include <skalibs/buffer.h>
#include <skalibs/strerr2.h>
#include <skalibs/stralloc.h>
#include <skalibs/genalloc.h>
#include <skalibs/env.h>
#include <skalibs/sig.h>
#include <skalibs/djbunix.h>
#include <skalibs/skamisc.h>
#include <skalibs/netstring.h>
#include <execline/config.h>
#include <execline/execline.h>
#define USAGE "forstdin [ -p | -o okcode,okcode,... | -x breakcode,breakcode,... ] [ -e eofcode ] [ -n ] [ -C | -c ] [ -0 | -d delim ] var command..."
#define dieusage() strerr_dieusage(100, USAGE)
static genalloc pids = GENALLOC_ZERO ; /* pid_t */
static int isok (unsigned short *tab, unsigned int n, int code)
{
unsigned int i = 0 ;
for (; i < n ; i++) if ((unsigned short)code == tab[i]) break ;
return i < n ;
}
static void parallel_sigchld_handler (int sig)
{
pid_t *tab = genalloc_s(pid_t, &pids) ;
size_t len = genalloc_len(pid_t, &pids) ;
int wstat ;
for (;;)
{
ssize_t r = wait_pids_nohang(tab, len, &wstat) ;
if (r <= 0) break ;
tab[r-1] = tab[--len] ;
}
genalloc_setlen(pid_t, &pids, len) ;
(void)sig ;
}
int main (int argc, char const **argv, char const *const *envp)
{
char const *delim = "\n" ;
size_t delimlen = 4 ;
size_t nbc = 0 ;
unsigned short okcodes[256] ;
int crunch = 0, chomp = 0, not = 1 ;
unsigned short eofcode = 0 ;
PROG = "forstdin" ;
{
subgetopt_t l = SUBGETOPT_ZERO ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "pnCc0d:o:x:e:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'p' :
{
if (!genalloc_ready(pid_t, &pids, 1))
strerr_diefu1sys(111, "genalloc_ready") ;
break ;
}
case 'n' : chomp = 1 ; break ;
case 'C' : crunch = 1 ; break ;
case 'c' : crunch = 0 ; break ;
case '0' : delim = "" ; delimlen = 1 ; break ;
case 'd' : delim = l.arg ; delimlen = strlen(delim) ; break ;
case 'o' :
not = 0 ;
if (!ushort_scanlist(okcodes, 256, l.arg, &nbc)) dieusage() ;
break ;
case 'x' :
not = 1 ;
if (!ushort_scanlist(okcodes, 256, l.arg, &nbc)) dieusage() ;
break ;
case 'e' :
if (!ushort_scan(l.arg, &eofcode)) dieusage() ;
break ;
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
}
if (argc < 2) dieusage() ;
{
stralloc modif = STRALLOC_ZERO ;
size_t envlen = env_len(envp) ;
size_t modifstart = strlen(argv[0]) + 1 ;
char const *newenv[envlen + 2] ;
if (!stralloc_ready(&modif, modifstart+1))
strerr_diefu1sys(111, "stralloc_ready") ;
memcpy(modif.s, argv[0], modifstart - 1) ;
modif.s[modifstart-1] = '=' ;
if (pids.s)
{
if (sig_catch(SIGCHLD, ¶llel_sigchld_handler) < 0)
strerr_diefu1sys(111, "install SIGCHLD handler") ;
}
for (;;)
{
pid_t pid ;
modif.len = modifstart ;
if (delimlen)
{
int r = skagetlnsep(buffer_0, &modif, delim, delimlen) ;
if (!r) break ;
else if (r < 0)
{
if (errno != EPIPE) strerr_diefu1sys(111, "skagetlnsep") ;
if (chomp) break ;
}
else modif.len-- ;
if ((modif.len == modifstart) && crunch) continue ;
}
else
{
size_t unread = 0 ;
if (netstring_get(buffer_0, &modif, &unread) <= 0)
{
if (netstring_okeof(buffer_0, unread)) break ;
else strerr_diefu1sys(111, "netstring_get") ;
}
}
if (!stralloc_0(&modif)) strerr_diefu1sys(111, "stralloc_0") ;
if (!env_merge(newenv, envlen+2, envp, envlen, modif.s, modif.len))
strerr_diefu1sys(111, "merge environment") ;
if (pids.s) sig_block(SIGCHLD) ;
pid = el_spawn0(argv[1], argv + 1, newenv) ;
if (!pid) strerr_diefu2sys(111, "spawn ", argv[1]) ;
if (pids.s)
{
if (!genalloc_append(pid_t, &pids, &pid))
strerr_diefu1sys(111, "genalloc_append") ;
sig_unblock(SIGCHLD) ;
}
else
{
int wstat ;
if (wait_pid(pid, &wstat) < 0)
strerr_diefu2sys(111, "wait for ", argv[1]) ;
if (not == isok(okcodes, nbc, wait_estatus(wstat)))
return wait_estatus(wstat) ;
}
}
stralloc_free(&modif) ;
}
if (pids.s)
for (;;)
{
sig_block(SIGCHLD) ;
if (!pids.len) break ;
sig_pause() ;
}
return eofcode ;
}
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