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/* ISC license. */
#include <skalibs/uint16.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/djbunix.h>
#include <skalibs/skamisc.h>
#include <execline/execline.h>
#include "exlsn.h"
#define USAGE "execlineb [ -p | -P | -S nmin ] [ -q | -w | -W ] [ -c commandline ] script args"
typedef unsigned char chargen_t (void) ;
/* Action (strongest 11 bits) */
#define PUSH 0x8000
#define PUSH0 0x4000
#define PUSHSPECIAL 0x2000
#define SETBASE 0x1000
#define MARK 0x0800
#define CALC 0x0400
#define QUOTE 0x0200
#define INCB 0x0100
#define DECB 0x0080
/* State (weakest 5 bits) */
#define MAIN 0x00
#define INWORD 0x01
#define INWORDESC 0x02
#define INSTR 0x03
#define INSTRESC 0x04
#define INREM 0x05
#define OCT0 0x06
#define OCT1 0x07
#define OCT2 0x08
#define DEC1 0x09
#define DEC2 0x0a
#define HEX0 0x0b
#define HEX1 0x0c
#define ENDCALC 0x0d
#define OPENB 0x0e
#define CLOSEB 0x0f
#define ERROR 0x10
#define ACCEPT 0x11
static buffer b ;
static void initbuffer (char const *s)
{
static char buf[BUFFER_INSIZE] ;
int fd = open_readb(s) ;
if (fd < 0) strerr_diefu3sys(111, "open ", s, " for reading") ;
if (coe(fd) < 0) strerr_diefu2sys(111, "coe ", s) ;
buffer_init(&b, &buffer_read, fd, buf, BUFFER_INSIZE) ;
}
static unsigned char nextinbuffer ()
{
char c ;
switch (buffer_get(&b, &c, 1))
{
case -1: strerr_diefu1sys(111, "read script") ;
case 0 : return 0 ;
}
return (unsigned char)c ;
}
static unsigned char const *string = 0 ;
static unsigned char nextinstring ()
{
static unsigned int pos = 0 ;
return string[pos++] ;
}
static int lex (stralloc *sa, chargen_t *next)
{
static unsigned char const class[256] = "`aaaaaaaaadaaaaaaaaaaaaaaaaaaaaaafcbffffffffffffjhhhhhhhiifffffffmmmmmmfffffffffffffffffffffeffffggmmmgfffffffkfffkfkfkflffnfoffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff" ;
static uint16 const table[16][16] =
{
{ 0x0011, 0x4011, 0x0010, 0x0010, 0x0010, 0x0011, 0x0010, 0x0010, 0x0010, 0x0010, 0x0010, 0x0010, 0x0010, 0x0010, 0x0010, 0x4091 },
{ 0x0000, 0x4000, 0x8001, 0x8003, 0x8003, 0x0005, 0x0010, 0x8403, 0x8403, 0x8403, 0x8403, 0x0010, 0x8403, 0x8403, 0x0100, 0x4080 },
{ 0x0005, 0x8001, 0x8001, 0x8003, 0x8003, 0x0005, 0x0010, 0x8403, 0x8403, 0x8403, 0x8403, 0x0010, 0x8403, 0x8403, 0x8001, 0x8001 },
{ 0x0203, 0x0003, 0x8001, 0x0001, 0x8003, 0x0005, 0x0010, 0x0401, 0x0401, 0x0401, 0x0401, 0x0010, 0x0401, 0x0401, 0x0003, 0x0003 },
{ 0x0000, 0x4000, 0x8001, 0x8003, 0x0003, 0x0000, 0x0010, 0x8403, 0x8403, 0x8403, 0x8403, 0x0010, 0x8403, 0x8403, 0x0100, 0x4080 },
{ 0x0202, 0x0002, 0x8001, 0x0004, 0x8003, 0x0005, 0x0010, 0x0404, 0x0404, 0x0404, 0x0404, 0x0010, 0x0404, 0x0404, 0x0002, 0x0002 },
{ 0x8201, 0x8001, 0x8001, 0x8003, 0x8003, 0x0005, 0x0010, 0x8403, 0x8403, 0x8403, 0x8403, 0x0010, 0x8403, 0x8403, 0x8001, 0x8001 },
{ 0x8201, 0x8001, 0x8001, 0x8003, 0x2003, 0x0005, 0x0010, 0x8403, 0x8403, 0x8403, 0x8403, 0x880c, 0x800d, 0x8403, 0x8001, 0x8001 },
{ 0x8201, 0x8001, 0x8001, 0x8003, 0x9809, 0x0005, 0x8807, 0x8008, 0x800d, 0x800a, 0x800d, 0x880c, 0x800d, 0x8403, 0x8001, 0x8001 },
{ 0x8201, 0x8001, 0x8001, 0x8003, 0x9809, 0x0005, 0x0010, 0x8403, 0x8403, 0x800a, 0x800d, 0x880c, 0x800d, 0x8403, 0x8001, 0x8001 },
{ 0x8201, 0x8001, 0x8001, 0x8003, 0x1006, 0x0005, 0x8807, 0x8008, 0x800d, 0x800a, 0x800d, 0x880c, 0x800d, 0x8403, 0x8001, 0x8001 },
{ 0x8201, 0x8001, 0x8001, 0x8003, 0x2003, 0x0005, 0x0010, 0x8403, 0x8403, 0x8403, 0x8403, 0x0010, 0x8403, 0x8403, 0x8001, 0x8001 },
{ 0x8201, 0x8001, 0x8001, 0x8003, 0x8003, 0x0005, 0x100b, 0x8403, 0x8403, 0x8403, 0x8403, 0x0010, 0x8403, 0x8403, 0x8001, 0x8001 },
{ 0x8201, 0x8001, 0x8001, 0x8003, 0x8003, 0x0005, 0x0010, 0x8403, 0x8403, 0x8403, 0x8403, 0x880c, 0x800d, 0x8403, 0x8001, 0x8001 },
{ 0x820e, 0x8001, 0x8001, 0x8003, 0x8003, 0x0005, 0x0010, 0x8403, 0x8403, 0x8403, 0x8403, 0x0010, 0x8403, 0x8403, 0x8001, 0x8001 },
{ 0x820f, 0x8001, 0x8001, 0x8003, 0x8003, 0x0005, 0x0010, 0x8403, 0x8403, 0x8403, 0x8403, 0x0010, 0x8403, 0x8403, 0x8001, 0x8001 }
} ;
unsigned int mark = 0 ;
unsigned int n = 0 ;
unsigned char state = MAIN, base = 10 ;
unsigned int blevel = 0 ;
while (state < ERROR)
{
unsigned char cur = (*next)() ;
register uint16 c = table[class[cur]-'`'][state] ;
state = c & 0x1F ;
/* Actions. The order is important ! */
if (c & CALC)
{
unsigned int z ;
if (!stralloc_0(sa)) return -1 ;
sa->len = mark ;
uint_scan_base(sa->s + sa->len, &z, base) ;
sa->s[sa->len++] = (unsigned char)z ;
}
if (c & MARK) mark = sa->len ;
if (c & QUOTE)
{
char tilde = EXECLINE_BLOCK_QUOTE_CHAR ;
register unsigned int i = blevel ;
if (!stralloc_readyplus(sa, i<<1)) return -1 ;
while (i--) stralloc_catb(sa, &tilde, 1) ;
}
if (c & INCB) sa->len -= ++blevel ;
if (c & DECB)
{
if (!blevel--) return -4 ;
sa->s[--sa->len-1] = EXECLINE_BLOCK_END_CHAR ;
if (!EXECLINE_BLOCK_END_CHAR) sa->len-- ;
}
if (c & PUSH) if (!stralloc_catb(sa, (char *)&cur, 1)) return -1 ;
if (c & PUSHSPECIAL)
{
char x = 7 + byte_chr("abtnvfr", 7, cur) ;
if (!stralloc_catb(sa, &x, 1)) return -1 ;
}
if (c & PUSH0) if (n++, !stralloc_0(sa)) return -1 ;
if (c & SETBASE)
switch (cur)
{
case 'x' : base = 16 ; break ;
case '0' : base = 8 ; break ;
default : base = 10 ;
}
}
if (state == ERROR) return -2 ;
if (blevel) return -3 ;
return n ;
}
static int myexlp (stralloc *sa, char const *const *argv, unsigned int argc, unsigned int nmin, char const *dollar0)
{
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 = argc ;
genalloc_catb(elsubst_t, &info.data, blah, 3) ;
}
for (; i < n ; i++)
{
elsubst_t blah ;
char fmt[UINT_FMT] ;
blah.var = info.vars.len ; blah.value = info.values.len ; blah.n = 1 ;
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) ;
}
{
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)
{
chargen_t *next ;
stralloc sa = STRALLOC_ZERO ;
stralloc modif = STRALLOC_ZERO ;
int nc ;
int flagstrict = -1 ;
unsigned int nmin = 0 ;
char const *dollar0 = argv[0] ;
unsigned int flagpushenv = 2 ;
PROG = "execlineb" ;
{
subgetopt_t l = SUBGETOPT_ZERO ;
for (;;)
{
register int opt = subgetopt_r(argc, argv, "pPqwWc: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' : string = (unsigned char *)l.arg ; break ;
case 'S' :
{
if (!uint0_scan(l.arg, &nmin)) strerr_dieusage(100, USAGE) ;
flagpushenv = 3 ;
break ;
}
default : strerr_dieusage(100, USAGE) ;
}
}
argc -= l.ind ; argv += l.ind ;
}
if (string) next = &nextinstring ;
else
{
if (!argv[0]) strerr_dieusage(100, USAGE) ;
initbuffer(argv[0]) ;
dollar0 = argv[0] ;
argv++ ; argc-- ;
next = &nextinbuffer ;
}
nc = lex(&sa, next) ;
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 = 0 ;
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) ;
if (nc < 0) strerr_diefu1sys(111, "substitute positional parameters") ;
}
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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