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Patch from vodz to fix the dynamic vars patch, which I should not

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have checked in.  Vladimir writes:

Your patch have many problem.
1. You always added + time(). This cannot reset RANDOM=value for debuging
with
replay sequential.
2. Hmm. I examine bash 2.04 source. This pseudorandom generator use low bits
of
counter value. You use high bits. This make bad pseudorandom values after
have
0-value. For example, if + time() do remove, your generator always return 0
after
first generate 0.
3. Memory leak per call. Use ash-unlike unecessary bb_strdup function.
4. Unsupport show last $RANDOM value for "set" and "export" command.
5. Bloat code. Busybox-unlike patch - added unstandart feature as default
hardcode.

Last patch attached.

Erik, why you apply Paul patch with have 5-th point problem? :(

Last patch have ash change xwrite() to fresh libbb/bb_full_write interfase
(haved loop after EINTR).


--w
vodz
This commit is contained in:
Eric Andersen 2004-03-16 05:14:10 +00:00
parent ca65ca7d45
commit 16767e2377
2 changed files with 97 additions and 75 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
shell/Config.in
View File

@ -97,6 +97,17 @@ config CONFIG_ASH_OPTIMIZE_FOR_SIZE
help
Compile ash for reduced size at price of speed.
config CONFIG_ASH_RANDOM_SUPPORT
bool " Enable pseudorandom generator and variable $RANDOM"
default n
depends on CONFIG_ASH
help
Enable pseudorandom generator and dynamic variable "$RANDOM".
Each read of "$RANDOM" will generate a new pseudorandom value.
You can reset the generator by using a specified start value.
After "unset RANDOM" then generator will switch off and this
variable will no longer have special treatment.
config CONFIG_HUSH
bool "hush"
default n

161
shell/ash.c
View File

@ -33,12 +33,14 @@
* rewrite arith.y to micro stack based cryptic algorithm by
* Copyright (c) 2001 Aaron Lehmann <aaronl@vitelus.com>
*
* Modified by Vladimir Oleynik <dzo@simtreas.ru> (c) 2001-2003 to be
* used in busybox and size optimizations,
* support locale, rewrited arith (see notes to this)
*
* Modified by Paul Mundt <lethal@linux-sh.org> (c) 2004 to support
* dynamic variables.
*
* Modified by Vladimir Oleynik <dzo@simtreas.ru> (c) 2001-2004 to be
* used in busybox and size optimizations,
* rewrote arith (see notes to this), added locale support,
* rewrote dynamic variables.
*
*/
@ -1447,6 +1449,14 @@ static void unsetfunc(const char *);
static int dash_arith(const char *);
#endif
#ifdef CONFIG_ASH_RANDOM_SUPPORT
static unsigned long rseed;
static void change_random(const char *);
# ifndef DYNAMIC_VAR
# define DYNAMIC_VAR
# endif
#endif
/* $NetBSD: init.h,v 1.9 2002/11/24 22:35:40 christos Exp $ */
static void reset(void);
@ -1467,19 +1477,18 @@ static void reset(void);
#define VNOFUNC 0x40 /* don't call the callback function */
#define VNOSET 0x80 /* do not set variable - just readonly test */
#define VNOSAVE 0x100 /* when text is on the heap before setvareq */
#define VDYNAMIC 0x200 /* dynamic variable */
#ifdef DYNAMIC_VAR
# define VDYNAMIC 0x200 /* dynamic variable */
# else
# define VDYNAMIC 0
#endif
struct var {
struct var *next; /* next entry in hash list */
int flags; /* flags are defined above */
const char *text; /* name=value */
void (*func)(const char *);
/* function to be called when */
void (*func)(const char *); /* function to be called when */
/* the variable gets set/unset */
char *(*lookup_func)(const char *);
/* function to be called when */
/* the variable is read (if dynamic) */
};
struct localvar {
@ -1506,8 +1515,6 @@ static void change_lc_all(const char *value);
static void change_lc_ctype(const char *value);
#endif
static char *get_random(const char *);
static void change_random(const char *);
#define VTABSIZE 39
@ -1522,32 +1529,33 @@ static const char defifs[] = " \t\n";
static struct var varinit[] = {
#ifdef IFS_BROKEN
{ 0, VSTRFIXED|VTEXTFIXED, defifsvar, 0, 0 },
{ 0, VSTRFIXED|VTEXTFIXED, defifsvar, 0 },
#else
{ 0, VSTRFIXED|VTEXTFIXED|VUNSET, "IFS\0", 0, 0 },
{ 0, VSTRFIXED|VTEXTFIXED|VUNSET, "IFS\0", 0 },
#endif
#ifdef CONFIG_ASH_MAIL
{ 0, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL\0", changemail, 0 },
{ 0, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH\0", changemail, 0 },
{ 0, VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL\0", changemail },
{ 0, VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH\0", changemail },
#endif
{ 0, VSTRFIXED|VTEXTFIXED, defpathvar, changepath, 0 },
{ 0, VSTRFIXED|VTEXTFIXED, "PS1=$ ", 0, 0 },
{ 0, VSTRFIXED|VTEXTFIXED, "PS2=> ", 0, 0 },
{ 0, VSTRFIXED|VTEXTFIXED, "PS4=+ ", 0, 0 },
{ 0, VSTRFIXED|VTEXTFIXED, defpathvar, changepath },
{ 0, VSTRFIXED|VTEXTFIXED, "PS1=$ ", 0 },
{ 0, VSTRFIXED|VTEXTFIXED, "PS2=> ", 0 },
{ 0, VSTRFIXED|VTEXTFIXED, "PS4=+ ", 0 },
#ifdef CONFIG_ASH_GETOPTS
{ 0, VSTRFIXED|VTEXTFIXED, "OPTIND=1", getoptsreset, 0 },
{ 0, VSTRFIXED|VTEXTFIXED, "OPTIND=1", getoptsreset },
#endif
#ifdef CONFIG_ASH_RANDOM_SUPPORT
{0, VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM\0", change_random },
#endif
#ifdef CONFIG_LOCALE_SUPPORT
{0, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_ALL=", change_lc_all, 0},
{0, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_CTYPE=", change_lc_ctype, 0},
{0, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_ALL\0", change_lc_all },
{0, VSTRFIXED | VTEXTFIXED | VUNSET, "LC_CTYPE\0", change_lc_ctype },
#endif
#ifdef CONFIG_FEATURE_COMMAND_SAVEHISTORY
{0, VSTRFIXED | VTEXTFIXED | VUNSET, "HISTFILE=", NULL, 0},
{0, VSTRFIXED | VTEXTFIXED | VUNSET, "HISTFILE\0", NULL },
#endif
{0, VSTRFIXED | VTEXTFIXED | VUNSET | VDYNAMIC, "RANDOM\0",
change_random, get_random},
};
#define vifs varinit[0]
@ -1562,7 +1570,11 @@ static struct var varinit[] = {
#define vps2 (&vps1)[1]
#define vps4 (&vps2)[1]
#define voptind (&vps4)[1]
#ifdef CONFIG_ASH_GETOPTS
#define vrandom (&voptind)[1]
#else
#define vrandom (&vps4)[1]
#endif
#define defpath (defpathvar + 5)
/*
@ -1630,12 +1642,11 @@ extern char **environ;
static void outstr(const char *, FILE *);
static void outcslow(int, FILE *);
static void flushall(void);
static void flushout(FILE *);
static void flusherr(void);
static int out1fmt(const char *, ...)
__attribute__((__format__(__printf__,1,2)));
static int fmtstr(char *, size_t, const char *, ...)
__attribute__((__format__(__printf__,3,4)));
static void xwrite(int, const void *, size_t);
static int preverrout_fd; /* save fd2 before print debug if xflag is set. */
@ -1648,7 +1659,7 @@ static void out1str(const char *p)
static void out2str(const char *p)
{
outstr(p, stderr);
flushout(stderr);
flusherr();
}
/*
@ -3287,7 +3298,7 @@ evalcommand(union node *cmd, int flags)
}
sp = arglist.list;
}
xwrite(preverrout_fd, "\n", 1);
bb_full_write(preverrout_fd, "\n", 1);
}
cmd_is_exec = 0;
@ -3304,7 +3315,7 @@ evalcommand(union node *cmd, int flags)
find_command(argv[0], &cmdentry, cmd_flag, path);
if (cmdentry.cmdtype == CMDUNKNOWN) {
status = 127;
flushout(stderr);
flusherr();
goto bail;
}
@ -4571,7 +4582,7 @@ expandhere(union node *arg, int fd)
{
herefd = fd;
expandarg(arg, (struct arglist *)NULL, 0);
xwrite(fd, stackblock(), expdest - (char *)stackblock());
bb_full_write(fd, stackblock(), expdest - (char *)stackblock());
}
@ -7905,6 +7916,10 @@ ash_main(int argc, char **argv)
trputs("Shell args: "); trargs(argv);
#endif
rootpid = getpid();
#ifdef CONFIG_ASH_RANDOM_SUPPORT
rseed = rootpid + ((time_t)time((time_t *)0));
#endif
rootshell = 1;
init();
setstackmark(&smark);
@ -8365,7 +8380,7 @@ growstackstr(void)
{
size_t len = stackblocksize();
if (herefd >= 0 && len >= 1024) {
xwrite(herefd, stackblock(), len);
bb_full_write(herefd, stackblock(), len);
return stackblock();
}
growstackblock();
@ -9030,21 +9045,26 @@ static void change_lc_ctype(const char *value)
#endif
#ifdef CONFIG_ASH_RANDOM_SUPPORT
/* Roughly copied from bash.. */
static unsigned long rseed = 1;
static char *get_random(const char *var)
{
char buf[255];
rseed = (rseed + getpid() + ((time_t)time((time_t *)0)));
rseed = rseed * 1103515245 + 12345;
sprintf(buf, "%d", (unsigned int)((rseed >> 16 & 32767)));
return bb_xstrdup(buf);
}
static void change_random(const char *value)
{
rseed = strtoul(value, (char **)NULL, 10);
if(value == NULL) {
/* "get", generate */
char buf[16];
rseed = rseed * 1103515245 + 12345;
sprintf(buf, "%d", (unsigned int)((rseed & 32767)));
/* set without recursion */
setvar(vrandom.text, buf, VNOFUNC);
vrandom.flags &= ~VNOFUNC;
} else {
/* set/reset */
rseed = strtoul(value, (char **)NULL, 10);
}
}
#endif
#ifdef CONFIG_ASH_GETOPTS
static int
@ -9234,10 +9254,10 @@ flushall(void)
}
void
flushout(FILE *dest)
flusherr(void)
{
INTOFF;
fflush(dest);
fflush(stderr);
INTON;
}
@ -9281,20 +9301,6 @@ fmtstr(char *outbuf, size_t length, const char *fmt, ...)
}
/*
* Version of write which resumes after a signal is caught.
*/
static void
xwrite(int fd, const void *p, size_t n)
{
ssize_t i;
do {
i = bb_full_write(fd, p, n);
} while (i < 0 && errno == EINTR);
}
/* $NetBSD: parser.c,v 1.54 2002/11/24 22:35:42 christos Exp $ */
@ -10951,7 +10957,7 @@ openhere(union node *redir)
if (redir->type == NHERE) {
len = strlen(redir->nhere.doc->narg.text);
if (len <= PIPESIZE) {
xwrite(pip[1], redir->nhere.doc->narg.text, len);
bb_full_write(pip[1], redir->nhere.doc->narg.text, len);
goto out;
}
}
@ -10965,7 +10971,7 @@ openhere(union node *redir)
#endif
signal(SIGPIPE, SIG_DFL);
if (redir->type == NHERE)
xwrite(pip[1], redir->nhere.doc->narg.text, len);
bb_full_write(pip[1], redir->nhere.doc->narg.text, len);
else
expandhere(redir->nhere.doc, pip[1]);
_exit(0);
@ -11998,10 +12004,13 @@ setvareq(char *s, int flags)
flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1));
vp = *findvar(vpp, s);
if (vp) {
if (vp->flags & VREADONLY) {
if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) {
const char *n;
if (flags & VNOSAVE)
free(s);
error("%.*s: is read only", strchrnul(s, '=') - s, s);
n = vp->text;
error("%.*s: is read only", strchrnul(n, '=') - n, n);
}
if (flags & VNOSET)
@ -12058,19 +12067,20 @@ lookupvar(const char *name)
{
struct var *v;
if ((v = *findvar(hashvar(name), name)) && !(v->flags & (VUNSET|VDYNAMIC))) {
return strchrnul(v->text, '=') + 1;
}
if ((v = *findvar(hashvar(name), name))) {
#ifdef DYNAMIC_VAR
/*
* Dynamic variables are implemented roughly the same way they are
* in bash. Namely, they're "special" so long as they aren't unset.
* As soon as they're unset, they're no longer dynamic, and dynamic
* lookup will no longer happen at that point. -- PFM.
*/
if (v && ((v->flags & VDYNAMIC)))
if (v->lookup_func)
return v->lookup_func(name);
if((v->flags & VDYNAMIC))
(*v->func)(NULL);
#endif
if(!(v->flags & VUNSET))
return strchrnul(v->text, '=') + 1;
}
return NULL;
}
@ -12346,8 +12356,9 @@ unsetvar(const char *s)
retval = 1;
if (flags & VREADONLY)
goto out;
if (flags & VDYNAMIC)
vp->flags &= ~VDYNAMIC;
#ifdef DYNAMIC_VAR
vp->flags &= ~VDYNAMIC;
#endif
if (flags & VUNSET)
goto ok;
if ((flags & VSTRFIXED) == 0) {