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/* ISC license. */
#include <errno.h>
#include <skalibs/uint.h>
#include <skalibs/allreadwrite.h>
#include <skalibs/sgetopt.h>
#include <skalibs/bytestr.h>
#include <skalibs/buffer.h>
#include <skalibs/strerr2.h>
#include <skalibs/stralloc.h>
#include <skalibs/genalloc.h>
#include <skalibs/env.h>
#include <skalibs/djbunix.h>
#include <skalibs/skamisc.h>
#include <execline/execline.h>
#include "exlsn.h"
#define USAGE "execlineb [ -p | -P | -S nmin | -s nmin ] [ -q | -w | -W ] [ -c commandline ] script args"
static int myexlp (stralloc *sa, char const *const *argv, unsigned int argc, unsigned int nmin, char const *dollar0, int doshift)
{
exlsn_t info = EXLSN_ZERO ;
unsigned int n = argc > nmin ? argc : nmin ;
unsigned int i = 0 ;
if (!genalloc_ready(elsubst_t, &info.data, 3 + n)) return -1 ;
if (!stralloc_ready(&info.vars, 6 + (n << 1))) goto err ;
stralloc_catb(&info.vars, "#\0" "0\0@", 6) ;
{
elsubst_t blah[3] ;
char fmt[UINT_FMT] ;
blah[0].var = 0 ; blah[0].value = 0 ; blah[0].n = 1 ;
if (!stralloc_catb(&info.values, fmt, uint_fmt(fmt, argc)) || !stralloc_0(&info.values)) goto err ;
blah[1].var = 2 ; blah[1].value = info.values.len ; blah[1].n = 1 ;
if (!stralloc_catb(&info.values, dollar0, str_len(dollar0) + 1)) goto err ;
blah[2].var = 4 ; blah[2].value = info.values.len ; blah[2].n = doshift && n == nmin ? 0 : argc ;
genalloc_catb(elsubst_t, &info.data, blah, 3) ;
}
for (; i < n ; i++)
{
elsubst_t blah = { .var = info.vars.len, .value = info.values.len, .n = 1 } ;
char fmt[UINT_FMT] ;
if (!stralloc_catb(&info.vars, fmt, uint_fmt(fmt, i+1)) || !stralloc_0(&info.vars)) goto err ;
if (!stralloc_catb(&info.values, i < argc ? argv[i] : "", i < argc ? str_len(argv[i]) + 1 : 1)) goto err ;
genalloc_append(elsubst_t, &info.data, &blah) ;
if (i == nmin && doshift)
{
elsubst_t *p = genalloc_s(elsubst_t, &info.data) + 2 ; /* hit $@ in-place */
p->value = blah.value ;
p->n = argc - nmin ;
}
}
{
stralloc dst = STRALLOC_ZERO ;
int r = el_substitute(&dst, sa->s, sa->len, info.vars.s, info.values.s, genalloc_s(elsubst_t, &info.data), genalloc_len(elsubst_t, &info.data)) ;
if (r < 0) goto err ;
exlsn_free(&info) ;
stralloc_free(sa) ;
*sa = dst ;
return r ;
}
err:
exlsn_free(&info) ;
return -1 ;
}
int main (int argc, char const *const *argv, char const *const *envp)
{
stralloc sa = STRALLOC_ZERO ;
stralloc modif = STRALLOC_ZERO ;
int nc ;
int flagstrict = -1 ;
unsigned int nmin = 0 ;
char const *stringarg = 0 ;
char const *dollar0 = *argv ;
unsigned int flagpushenv = 2 ;
PROG = "execlineb" ;
{
subgetopt_t l = SUBGETOPT_ZERO ;
for (;;)
{
register int opt = subgetopt_r(argc, argv, "pPqwWc:S:s:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'p' : flagpushenv = 1 ; break ;
case 'P' : flagpushenv = 0 ; break ;
case 'q' : flagstrict = 0 ; break ;
case 'w' : flagstrict = 1 ; break ;
case 'W' : flagstrict = 2 ; break ;
case 'c' : stringarg = l.arg ; break ;
case 'S' :
case 's' :
{
if (!uint0_scan(l.arg, &nmin)) strerr_dieusage(100, USAGE) ;
flagpushenv = 3 + (opt == 's') ;
break ;
}
default : strerr_dieusage(100, USAGE) ;
}
}
argc -= l.ind ; argv += l.ind ;
}
if (stringarg) nc = el_parse_from_string(&sa, stringarg) ;
else
{
char buf[BUFFER_INSIZE] ;
buffer b ;
int fd ;
int e ;
if (!argc--) strerr_dieusage(100, USAGE) ;
dollar0 = *argv++ ;
fd = open_readb(dollar0) ;
if (fd < 0) strerr_diefu3sys(111, "open ", dollar0, " for reading") ;
buffer_init(&b, &fd_readsv, fd, buf, BUFFER_INSIZE) ;
nc = el_parse_from_buffer(&sa, &b) ;
e = errno ;
fd_close(fd) ;
errno = e ;
}
switch (nc)
{
case -4: strerr_dief2x(100, "unmatched ", "}") ;
case -3: strerr_dief2x(100, "unmatched ", "{") ;
case -2: strerr_dief1x(100, "syntax error") ;
case -1: strerr_diefu1sys(111, "parse script") ;
case 0 : return 0 ;
}
if (flagstrict >= 0)
{
char fmt[UINT_FMT] ;
fmt[uint_fmt(fmt, (unsigned int)flagstrict)] = 0 ;
if (!env_addmodif(&modif, "EXECLINE_STRICT", flagstrict ? fmt : 0)) goto errenv ;
}
if (flagpushenv == 3 || flagpushenv == 4)
{
if (flagstrict && ((unsigned int)argc < nmin))
{
char fmtn[UINT_FMT] ;
char fmta[UINT_FMT] ;
fmtn[uint_fmt(fmtn, nmin)] = 0 ;
fmta[uint_fmt(fmta, argc)] = 0 ;
if (flagstrict > 1)
strerr_dief4x(100, "too few arguments: expecting at least ", fmtn, " but got ", fmta) ;
else
strerr_warnw4x("too few arguments: expecting at least ", fmtn, " but got ", fmta) ;
}
nc = myexlp(&sa, argv, argc, nmin, dollar0, flagpushenv == 4) ;
if (nc < 0) strerr_diefu1sys(111, "substitute positional parameters") ;
flagpushenv = 0 ;
}
else if (flagpushenv)
{
char fmt[UINT_FMT] ;
register unsigned int i = 0 ;
fmt[uint_fmt(fmt, argc)] = 0 ;
if (!env_addmodif(&modif, "#", fmt)) goto errenv ;
if (!env_addmodif(&modif, "0", dollar0)) goto errenv ;
for (; i < (unsigned int)argc ; i++)
{
fmt[uint_fmt(fmt, i+1)] = 0 ;
if (!env_addmodif(&modif, fmt, argv[i])) goto errenv ;
}
}
{
char const *v[nc+1] ;
if (!env_make(v, nc, sa.s, sa.len)) strerr_diefu1sys(111, "make argv") ;
v[nc] = 0 ;
if (flagpushenv > 1)
{
static char const *const list[11] = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "#" } ;
unsigned int envlen = env_len(envp) ;
char const *w[envlen] ;
if (el_pushenv(&satmp, envp, envlen, list, 11) < 0) goto errenv ;
if (!env_make(w, envlen, satmp.s, satmp.len)) goto errenv ;
pathexec_r(v, w, envlen, modif.s, modif.len) ;
stralloc_free(&satmp) ;
}
else if (modif.len)
pathexec_r(v, envp, env_len(envp), modif.s, modif.len) ;
else
pathexec_run(v[0], v, envp) ;
}
stralloc_free(&modif) ;
strerr_dieexec(111, sa.s) ;
errenv:
strerr_diefu1sys(111, "update environment") ;
}
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