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shell: split read builtin from ash

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Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-01-12 22:11:24 +01:00
parent 6c93b24ce9
commit 7306727d1b
14 changed files with 378 additions and 216 deletions
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2
TODO_config_nommu
View File

@ -859,8 +859,6 @@ CONFIG_FEATURE_SH_IS_HUSH=y
# CONFIG_ASH is not set
# CONFIG_ASH_BASH_COMPAT is not set
# CONFIG_ASH_JOB_CONTROL is not set
# CONFIG_ASH_READ_NCHARS is not set
# CONFIG_ASH_READ_TIMEOUT is not set
# CONFIG_ASH_ALIAS is not set
# CONFIG_ASH_GETOPTS is not set
# CONFIG_ASH_BUILTIN_ECHO is not set

2
scripts/defconfig
View File

@ -856,8 +856,6 @@ CONFIG_FEATURE_SH_IS_ASH=y
CONFIG_ASH=y
CONFIG_ASH_BASH_COMPAT=y
CONFIG_ASH_JOB_CONTROL=y
CONFIG_ASH_READ_NCHARS=y
CONFIG_ASH_READ_TIMEOUT=y
CONFIG_ASH_ALIAS=y
CONFIG_ASH_GETOPTS=y
CONFIG_ASH_BUILTIN_ECHO=y

2
shell/Kbuild
View File

@ -5,7 +5,7 @@
# Licensed under the GPL v2, see the file LICENSE in this tarball.
lib-y:=
lib-$(CONFIG_ASH) += ash.o ash_ptr_hack.o
lib-$(CONFIG_ASH) += ash.o ash_ptr_hack.o shell_common.o builtin_read.o
lib-$(CONFIG_HUSH) += hush.o match.o
lib-$(CONFIG_CTTYHACK) += cttyhack.o

232
shell/ash.c
View File

@ -2,18 +2,18 @@
/*
* ash shell port for busybox
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Original BSD copyright notice is retained at the end of this file.
*
* Copyright (c) 1989, 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
* was re-ported from NetBSD and debianized.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*
* Original BSD copyright notice is retained at the end of this file.
*/
/*
@ -34,8 +34,6 @@
#define PROFILE 0
#define IFS_BROKEN
#define JOBS ENABLE_ASH_JOB_CONTROL
#if DEBUG
@ -50,6 +48,9 @@
#include <paths.h>
#include <setjmp.h>
#include <fnmatch.h>
#include "shell_common.h"
#include "builtin_read.h"
#include "math.h"
#if ENABLE_ASH_RANDOM_SUPPORT
# include "random.h"
@ -1737,13 +1738,6 @@ struct localvar {
# define VDYNAMIC 0
#endif
#ifdef IFS_BROKEN
static const char defifsvar[] ALIGN1 = "IFS= \t\n";
#define defifs (defifsvar + 4)
#else
static const char defifs[] ALIGN1 = " \t\n";
#endif
/* Need to be before varinit_data[] */
#if ENABLE_LOCALE_SUPPORT
@ -1774,7 +1768,7 @@ static const struct {
const char *text;
void (*func)(const char *) FAST_FUNC;
} varinit_data[] = {
#ifdef IFS_BROKEN
#if IFS_BROKEN
{ VSTRFIXED|VTEXTFIXED , defifsvar , NULL },
#else
{ VSTRFIXED|VTEXTFIXED|VUNSET, "IFS\0" , NULL },
@ -12499,211 +12493,53 @@ typedef enum __rlimit_resource rlim_t;
static int FAST_FUNC
readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
{
static const char *const arg_REPLY[] = { "REPLY", NULL };
char **ap;
int backslash;
char c;
int rflag;
char *prompt;
const char *ifs;
char *p;
int startword;
int status;
char *opt_n = NULL;
char *opt_p = NULL;
char *opt_t = NULL;
char *opt_u = NULL;
int read_flags = 0;
const char *r;
int i;
int fd = 0;
#if ENABLE_ASH_READ_NCHARS
int nchars = 0; /* if != 0, -n is in effect */
int silent = 0;
struct termios tty, old_tty;
#endif
#if ENABLE_ASH_READ_TIMEOUT
unsigned end_ms = 0;
unsigned timeout = 0;
#endif
rflag = 0;
prompt = NULL;
while ((i = nextopt("p:u:r"
IF_ASH_READ_TIMEOUT("t:")
IF_ASH_READ_NCHARS("n:s")
)) != '\0') {
while ((i = nextopt("p:u:rt:n:s")) != '\0') {
switch (i) {
case 'p':
prompt = optionarg;
opt_p = optionarg;
break;
#if ENABLE_ASH_READ_NCHARS
case 'n':
nchars = bb_strtou(optionarg, NULL, 10);
if (nchars < 0 || errno)
ash_msg_and_raise_error("invalid count");
/* nchars == 0: off (bash 3.2 does this too) */
opt_n = optionarg;
break;
case 's':
silent = 1;
read_flags |= BUILTIN_READ_SILENT;
break;
#endif
#if ENABLE_ASH_READ_TIMEOUT
case 't':
timeout = bb_strtou(optionarg, NULL, 10);
if (errno || timeout > UINT_MAX / 2048)
ash_msg_and_raise_error("invalid timeout");
timeout *= 1000;
#if 0 /* even bash have no -t N.NNN support */
ts.tv_sec = bb_strtou(optionarg, &p, 10);
ts.tv_usec = 0;
/* EINVAL means number is ok, but not terminated by NUL */
if (*p == '.' && errno == EINVAL) {
char *p2;
if (*++p) {
int scale;
ts.tv_usec = bb_strtou(p, &p2, 10);
if (errno)
ash_msg_and_raise_error("invalid timeout");
scale = p2 - p;
/* normalize to usec */
if (scale > 6)
ash_msg_and_raise_error("invalid timeout");
while (scale++ < 6)
ts.tv_usec *= 10;
}
} else if (ts.tv_sec < 0 || errno) {
ash_msg_and_raise_error("invalid timeout");
}
if (!(ts.tv_sec | ts.tv_usec)) { /* both are 0? */
ash_msg_and_raise_error("invalid timeout");
}
#endif /* if 0 */
opt_t = optionarg;
break;
#endif
case 'r':
rflag = 1;
read_flags |= BUILTIN_READ_RAW;
break;
case 'u':
fd = bb_strtou(optionarg, NULL, 10);
if (fd < 0 || errno)
ash_msg_and_raise_error("invalid file descriptor");
opt_u = optionarg;
break;
default:
break;
}
}
if (prompt && isatty(fd)) {
out2str(prompt);
}
ap = argptr;
if (*ap == NULL)
ap = (char**)arg_REPLY;
ifs = bltinlookup("IFS");
if (ifs == NULL)
ifs = defifs;
#if ENABLE_ASH_READ_NCHARS
tcgetattr(fd, &tty);
old_tty = tty;
if (nchars || silent) {
if (nchars) {
tty.c_lflag &= ~ICANON;
tty.c_cc[VMIN] = nchars < 256 ? nchars : 255;
}
if (silent) {
tty.c_lflag &= ~(ECHO | ECHOK | ECHONL);
}
/* if tcgetattr failed, tcsetattr will fail too.
* Ignoring, it's harmless. */
tcsetattr(fd, TCSANOW, &tty);
}
#endif
status = 0;
startword = 1;
backslash = 0;
#if ENABLE_ASH_READ_TIMEOUT
if (timeout) /* NB: ensuring end_ms is nonzero */
end_ms = ((unsigned)monotonic_ms() + timeout) | 1;
#endif
STARTSTACKSTR(p);
do {
const char *is_ifs;
r = builtin_read(setvar,
argptr,
bltinlookup("IFS"), /* can be NULL */
read_flags,
opt_n,
opt_p,
opt_t,
opt_u
);
#if ENABLE_ASH_READ_TIMEOUT
if (end_ms) {
struct pollfd pfd[1];
pfd[0].fd = fd;
pfd[0].events = POLLIN;
timeout = end_ms - (unsigned)monotonic_ms();
if ((int)timeout <= 0 /* already late? */
|| safe_poll(pfd, 1, timeout) != 1 /* no? wait... */
) { /* timed out! */
#if ENABLE_ASH_READ_NCHARS
tcsetattr(fd, TCSANOW, &old_tty);
#endif
return 1;
}
}
#endif
if (nonblock_safe_read(fd, &c, 1) != 1) {
status = 1;
break;
}
if (c == '\0')
continue;
if (backslash) {
backslash = 0;
if (c != '\n')
goto put;
continue;
}
if (!rflag && c == '\\') {
backslash = 1;
continue;
}
if (c == '\n')
break;
/* $IFS splitting */
/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05 */
is_ifs = strchr(ifs, c);
if (startword && is_ifs) {
if (isspace(c))
continue;
/* it is a non-space ifs char */
startword--;
if (startword == 1) /* first one? */
continue; /* yes, it is not next word yet */
}
startword = 0;
if (ap[1] != NULL && is_ifs) {
const char *beg;
STACKSTRNUL(p);
beg = stackblock();
setvar(*ap, beg, 0);
ap++;
/* can we skip one non-space ifs char? (2: yes) */
startword = isspace(c) ? 2 : 1;
STARTSTACKSTR(p);
continue;
}
put:
STPUTC(c, p);
}
/* end of do {} while: */
#if ENABLE_ASH_READ_NCHARS
while (--nchars);
#else
while (1);
#endif
if ((uintptr_t)r > 1)
ash_msg_and_raise_error(r);
#if ENABLE_ASH_READ_NCHARS
tcsetattr(fd, TCSANOW, &old_tty);
#endif
STACKSTRNUL(p);
/* Remove trailing space ifs chars */
while ((char *)stackblock() <= --p && isspace(*p) && strchr(ifs, *p) != NULL)
*p = '\0';
setvar(*ap, stackblock(), 0);
while (*++ap != NULL)
setvar(*ap, nullstr, 0);
return status;
return (uintptr_t)r;
}
static int FAST_FUNC

5
shell/ash_test/ash-read/read_REPLY.right Normal file
View File

@ -0,0 +1,5 @@
test 1: | abc1 def |
test 2: | \abc2 d\ef |
test 3: |abc3 def|
test 4: |\abc4 d\ef|
Done

5
shell/ash_test/ash-read/read_REPLY.tests Executable file
View File

@ -0,0 +1,5 @@
echo ' \abc1 d\ef ' | ( read ; echo "test 1: |$REPLY|" )
echo ' \abc2 d\ef ' | ( read -r ; echo "test 2: |$REPLY|" )
echo ' \abc3 d\ef ' | ( read REPLY; echo "test 3: |$REPLY|" )
echo ' \abc4 d\ef ' | ( read -r REPLY; echo "test 4: |$REPLY|" )
echo Done

205
shell/builtin_read.c Normal file
View File

@ -0,0 +1,205 @@
/* vi: set sw=4 ts=4: */
/*
* Adapted from ash applet code
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Copyright (c) 1989, 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
* was re-ported from NetBSD and debianized.
*
* Copyright (c) 2010 Denys Vlasenko
* Split from ash.c
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
#include "libbb.h"
#include "shell_common.h"
#include "builtin_read.h"
const char* FAST_FUNC
builtin_read(void (*setvar)(const char *name, const char *val, int flags),
char **argv,
const char *ifs,
int read_flags,
const char *opt_n,
const char *opt_p,
const char *opt_t,
const char *opt_u
)
{
static const char *const arg_REPLY[] = { "REPLY", NULL };
unsigned end_ms; /* -t TIMEOUT */
int fd; /* -u FD */
int nchars; /* -n NUM */
char *buffer;
struct termios tty, old_tty;
const char *retval;
int bufpos; /* need to be able to hold -1 */
int startword;
smallint backslash;
nchars = 0; /* if != 0, -n is in effect */
if (opt_n) {
nchars = bb_strtou(opt_n, NULL, 10);
if (nchars < 0 || errno)
return "invalid count";
/* note: "-n 0": off (bash 3.2 does this too) */
}
end_ms = 0;
if (opt_t) {
end_ms = bb_strtou(opt_t, NULL, 10);
if (errno || end_ms > UINT_MAX / 2048)
return "invalid timeout";
end_ms *= 1000;
#if 0 /* even bash has no -t N.NNN support */
ts.tv_sec = bb_strtou(opt_t, &p, 10);
ts.tv_usec = 0;
/* EINVAL means number is ok, but not terminated by NUL */
if (*p == '.' && errno == EINVAL) {
char *p2;
if (*++p) {
int scale;
ts.tv_usec = bb_strtou(p, &p2, 10);
if (errno)
return "invalid timeout";
scale = p2 - p;
/* normalize to usec */
if (scale > 6)
return "invalid timeout";
while (scale++ < 6)
ts.tv_usec *= 10;
}
} else if (ts.tv_sec < 0 || errno) {
return "invalid timeout";
}
if (!(ts.tv_sec | ts.tv_usec)) { /* both are 0? */
return "invalid timeout";
}
#endif /* if 0 */
}
fd = STDIN_FILENO;
if (opt_u) {
fd = bb_strtou(opt_u, NULL, 10);
if (fd < 0 || errno)
return "invalid file descriptor";
}
if (opt_p && isatty(fd)) {
fputs(opt_p, stderr);
fflush_all();
}
if (argv[0] == NULL)
argv = (char**)arg_REPLY;
if (ifs == NULL)
ifs = defifs;
if (nchars || (read_flags & BUILTIN_READ_SILENT)) {
tcgetattr(fd, &tty);
old_tty = tty;
if (nchars) {
tty.c_lflag &= ~ICANON;
tty.c_cc[VMIN] = nchars < 256 ? nchars : 255;
}
if (read_flags & BUILTIN_READ_SILENT) {
tty.c_lflag &= ~(ECHO | ECHOK | ECHONL);
}
/* This forces execution of "restoring" tcgetattr later */
read_flags |= BUILTIN_READ_SILENT;
/* if tcgetattr failed, tcsetattr will fail too.
* Ignoring, it's harmless. */
tcsetattr(fd, TCSANOW, &tty);
}
retval = (const char *)(uintptr_t)0;
startword = 1;
backslash = 0;
if (end_ms) /* NB: end_ms stays nonzero: */
end_ms = ((unsigned)monotonic_ms() + end_ms) | 1;
buffer = NULL;
bufpos = 0;
do {
char c;
const char *is_ifs;
if (end_ms) {
int timeout;
struct pollfd pfd[1];
pfd[0].fd = fd;
pfd[0].events = POLLIN;
timeout = end_ms - (unsigned)monotonic_ms();
if (timeout <= 0 /* already late? */
|| safe_poll(pfd, 1, timeout) != 1 /* no? wait... */
) { /* timed out! */
retval = (const char *)(uintptr_t)1;
goto ret;
}
}
if ((bufpos & 0xff) == 0)
buffer = xrealloc(buffer, bufpos + 0x100);
if (nonblock_safe_read(fd, &buffer[bufpos], 1) != 1) {
retval = (const char *)(uintptr_t)1;
break;
}
c = buffer[bufpos];
if (c == '\0')
continue;
if (backslash) {
backslash = 0;
if (c != '\n')
goto put;
continue;
}
if (!(read_flags & BUILTIN_READ_RAW) && c == '\\') {
backslash = 1;
continue;
}
if (c == '\n')
break;
/* $IFS splitting */
/* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05 */
is_ifs = strchr(ifs, c);
if (startword && is_ifs) {
if (isspace(c))
continue;
/* it is a non-space ifs char */
startword--;
if (startword == 1) /* first one? */
continue; /* yes, it is not next word yet */
}
startword = 0;
if (argv[1] != NULL && is_ifs) {
buffer[bufpos] = '\0';
bufpos = 0;
setvar(*argv, buffer, 0);
argv++;
/* can we skip one non-space ifs char? (2: yes) */
startword = isspace(c) ? 2 : 1;
continue;
}
put:
bufpos++;
} while (--nchars);
/* Remove trailing space ifs chars */
while (--bufpos >= 0 && isspace(buffer[bufpos]) && strchr(ifs, buffer[bufpos]) != NULL)
continue;
buffer[bufpos + 1] = '\0';
setvar(*argv, buffer, 0);
while (*++argv != NULL)
setvar(*argv, "", 0);
ret:
free(buffer);
if (read_flags & BUILTIN_READ_SILENT)
tcsetattr(fd, TCSANOW, &old_tty);
return retval;
}

42
shell/builtin_read.h Normal file
View File

@ -0,0 +1,42 @@
/* vi: set sw=4 ts=4: */
/*
* Adapted from ash applet code
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Copyright (c) 1989, 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
* was re-ported from NetBSD and debianized.
*
* Copyright (c) 2010 Denys Vlasenko
* Split from ash.c
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
#ifndef SHELL_BUILTIN_READ_H
#define SHELL_BUILTIN_READ_H 1
PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
enum {
BUILTIN_READ_SILENT = 1 << 0,
BUILTIN_READ_RAW = 1 << 1,
};
const char* FAST_FUNC
builtin_read(void (*setvar)(const char *name, const char *val, int flags),
char **argv,
const char *ifs,
int read_flags,
const char *opt_n,
const char *opt_p,
const char *opt_t,
const char *opt_u
);
POP_SAVED_FUNCTION_VISIBILITY
#endif

10
shell/match.c
View File

@ -1,16 +1,16 @@
/*
* ##/%% variable matching code ripped out of ash shell for code sharing
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*
* Copyright (c) 1989, 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
* was re-ported from NetBSD and debianized.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
#ifdef STANDALONE
# include <stdbool.h>

5
shell/match.h
View File

@ -1,5 +1,8 @@
/* match.h - interface to shell ##/%% matching code */
#ifndef SHELL_MATCH_H
#define SHELL_MATCH_H 1
PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
typedef char *(*scan_t)(char *string, char *match, bool match_at_left);
@ -24,3 +27,5 @@ static inline scan_t pick_scan(char op1, char op2, bool *match_at_left)
}
POP_SAVED_FUNCTION_VISIBILITY
#endif

15
shell/math.c
View File

@ -1,20 +1,17 @@
/*
* arithmetic code ripped out of ash shell for code sharing
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Original BSD copyright notice is retained at the end of this file.
*
* Copyright (c) 1989, 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
* was re-ported from NetBSD and debianized.
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*
* Original BSD copyright notice is retained at the end of this file.
*/
/*
* rewrite arith.y to micro stack based cryptic algorithm by
* Copyright (c) 2001 Aaron Lehmann <aaronl@vitelus.com>
*
@ -25,6 +22,8 @@
* used in busybox and size optimizations,
* rewrote arith (see notes to this), added locale support,
* rewrote dynamic variables.
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
#include "libbb.h"
#include "math.h"

8
shell/random.h
View File

@ -6,6 +6,10 @@
*
* Licensed under GPLv2, see file LICENSE in this tarball for details.
*/
#ifndef SHELL_RANDOM_H
#define SHELL_RANDOM_H 1
PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
typedef struct random_t {
/* Random number generators */
@ -23,3 +27,7 @@ typedef struct random_t {
((rnd)->galois_LFSR = 0)
uint32_t next_random(random_t *rnd) FAST_FUNC;
POP_SAVED_FUNCTION_VISIBILITY
#endif

26
shell/shell_common.c Normal file
View File

@ -0,0 +1,26 @@
/* vi: set sw=4 ts=4: */
/*
* Adapted from ash applet code
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Copyright (c) 1989, 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
* was re-ported from NetBSD and debianized.
*
* Copyright (c) 2010 Denys Vlasenko
* Split from ash.c
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
#include "libbb.h"
#include "shell_common.h"
#if IFS_BROKEN
const char defifsvar[] ALIGN1 = "IFS= \t\n";
#else
const char defifs[] ALIGN1 = " \t\n";
#endif

35
shell/shell_common.h Normal file
View File

@ -0,0 +1,35 @@
/* vi: set sw=4 ts=4: */
/*
* Adapted from ash applet code
*
* This code is derived from software contributed to Berkeley by
* Kenneth Almquist.
*
* Copyright (c) 1989, 1991, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au>
* was re-ported from NetBSD and debianized.
*
* Copyright (c) 2010 Denys Vlasenko
* Split from ash.c
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
#ifndef SHELL_COMMON_H
#define SHELL_COMMON_H 1
PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
#define IFS_BROKEN 1
#if IFS_BROKEN
extern const char defifsvar[]; /* "IFS= \t\n" */
#define defifs (defifsvar + 4)
#else
extern const char defifs[]; /* " \t\n" */
#endif
POP_SAVED_FUNCTION_VISIBILITY
#endif