hush: use ash's read builtin

function                                             old     new   delta
shell_builtin_read                                     -    1000   +1000
set_local_var_from_halves                              -      24     +24
setvar2                                                -       7      +7
...
popstring                                            140     134      -6
ash_main                                            1375    1368      -7
setvar                                               184     174     -10
arith_set_local_var                                   36       -     -36
builtin_read                                        1096     185    -911
------------------------------------------------------------------------------
(add/remove: 3/1 grow/shrink: 5/23 up/down: 1038/-1007)        Total: 31 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

18 files changed, 124 insertions, 49 deletions

diff --git a/shell/Kbuild b/shell/Kbuild
index 155ac6f..d8306dc 100644
--- a/shell/Kbuild
+++ b/shell/Kbuild
@@ -6,7 +6,7 @@
 
 lib-y:=
 lib-$(CONFIG_ASH)      += ash.o ash_ptr_hack.o shell_common.o builtin_read.o
-lib-$(CONFIG_HUSH)     += hush.o match.o
+lib-$(CONFIG_HUSH)     += hush.o match.o shell_common.o builtin_read.o
 lib-$(CONFIG_CTTYHACK) += cttyhack.o
 
 lib-$(CONFIG_SH_MATH_SUPPORT) += math.o
diff --git a/shell/ash.c b/shell/ash.c
index c7deffd..31dc592 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -1884,7 +1884,7 @@ getoptsreset(const char *value)
  * Return of a legal variable name (a letter or underscore followed by zero or
  * more letters, underscores, and digits).
  */
-static char *
+static char* FAST_FUNC
 endofname(const char *name)
 {
 	char *p;
@@ -1991,7 +1991,7 @@ findvar(struct var **vpp, const char *name)
 /*
  * Find the value of a variable.  Returns NULL if not set.
  */
-static const char *
+static const char* FAST_FUNC
 lookupvar(const char *name)
 {
 	struct var *v;
@@ -2114,6 +2114,12 @@ setvar(const char *name, const char *val, int flags)
 	INT_ON;
 }
 
+static void FAST_FUNC
+setvar2(const char *name, const char *val)
+{
+	setvar(name, val, 0);
+}
+
 #if ENABLE_ASH_GETOPTS
 /*
  * Safe version of setvar, returns 1 on success 0 on failure.
@@ -5304,7 +5310,7 @@ ash_arith(const char *s)
 	int errcode = 0;
 
 	math_hooks.lookupvar = lookupvar;
-	math_hooks.setvar = setvar;
+	math_hooks.setvar    = setvar2;
 	math_hooks.endofname = endofname;
 
 	INT_OFF;
@@ -12526,7 +12532,7 @@ readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
 		}
 	}
 
-	r = builtin_read(setvar,
+	r = shell_builtin_read(setvar2,
 		argptr,
 		bltinlookup("IFS"), /* can be NULL */
 		read_flags,
diff --git a/shell/builtin_read.c b/shell/builtin_read.c
index 24cfe08..412bcf8 100644
--- a/shell/builtin_read.c
+++ b/shell/builtin_read.c
@@ -21,7 +21,7 @@
 #include "builtin_read.h"
 
 const char* FAST_FUNC
-builtin_read(void (*setvar)(const char *name, const char *val, int flags),
+shell_builtin_read(void FAST_FUNC (*setvar)(const char *name, const char *val),
 	char       **argv,
 	const char *ifs,
 	int        read_flags,
@@ -178,7 +178,7 @@ builtin_read(void (*setvar)(const char *name, const char *val, int flags),
 			if (argv[1] != NULL && is_ifs) {
 				buffer[bufpos] = '\0';
 				bufpos = 0;
-				setvar(*argv, buffer, 0);
+				setvar(*argv, buffer);
 				argv++;
 				/* can we skip one non-space ifs char? (2: yes) */
 				startword = isspace(c) ? 2 : 1;
@@ -195,14 +195,14 @@ builtin_read(void (*setvar)(const char *name, const char *val, int flags),
 			continue;
 		buffer[bufpos + 1] = '\0';
 		/* Use the remainder as a value for the next variable */
-		setvar(*argv, buffer, 0);
+		setvar(*argv, buffer);
 		/* Set the rest to "" */
 		while (*++argv)
-			setvar(*argv, "", 0);
+			setvar(*argv, "");
 	} else {
 		/* Note: no $IFS removal */
 		buffer[bufpos] = '\0';
-		setvar("REPLY", buffer, 0);
+		setvar("REPLY", buffer);
 	}
 
  ret:
diff --git a/shell/builtin_read.h b/shell/builtin_read.h
index 930d014..bc23dc5 100644
--- a/shell/builtin_read.h
+++ b/shell/builtin_read.h
@@ -27,7 +27,7 @@ enum {
 };
 
 const char* FAST_FUNC
-builtin_read(void (*setvar)(const char *name, const char *val, int flags),
+shell_builtin_read(void FAST_FUNC (*setvar)(const char *name, const char *val),
 	char       **argv,
 	const char *ifs,
 	int        read_flags,
diff --git a/shell/hush.c b/shell/hush.c
index 88a7b98..bb0ab84 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -84,6 +84,9 @@
 #if ENABLE_HUSH_CASE
 # include <fnmatch.h>
 #endif
+
+#include "shell_common.h"
+#include "builtin_read.h"
 #include "math.h"
 #include "match.h"
 #if ENABLE_HUSH_RANDOM_SUPPORT
@@ -1307,7 +1310,7 @@ static struct variable *get_local_var(const char *name)
 	return NULL;
 }
 
-static const char *get_local_var_value(const char *name)
+static const char* FAST_FUNC get_local_var_value(const char *name)
 {
 	struct variable **pp = get_ptr_to_local_var(name);
 	if (pp)
@@ -1510,7 +1513,7 @@ static void unset_vars(char **strings)
 #if ENABLE_SH_MATH_SUPPORT
 #define is_name(c)      ((c) == '_' || isalpha((unsigned char)(c)))
 #define is_in_name(c)   ((c) == '_' || isalnum((unsigned char)(c)))
-static char *endofname(const char *name)
+static char* FAST_FUNC endofname(const char *name)
 {
 	char *p;
 
@@ -1524,11 +1527,10 @@ static char *endofname(const char *name)
 	return p;
 }
 
-static void arith_set_local_var(const char *name, const char *val, int flags)
+static void FAST_FUNC set_local_var_from_halves(const char *name, const char *val)
 {
-	/* arith code doesnt malloc space, so do it for it */
 	char *var = xasprintf("%s=%s", name, val);
-	set_local_var(var, flags, /*lvl:*/ 0, /*ro:*/ 0);
+	set_local_var(var, /*flags:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
 }
 #endif
 
@@ -2538,7 +2540,7 @@ static NOINLINE int expand_vars_to_list(o_string *output, int n, char *arg, char
 
 			exp_str = expand_pseudo_dquoted(arg);
 			hooks.lookupvar = get_local_var_value;
-			hooks.setvar = arith_set_local_var;
+			hooks.setvar = set_local_var_from_halves;
 			hooks.endofname = endofname;
 			res = arith(exp_str ? exp_str : arg, &errcode, &hooks);
 			free(exp_str);
@@ -6157,7 +6159,7 @@ static struct pipe *parse_stream(char **pstring,
 
 	G.ifs = get_local_var_value("IFS");
 	if (G.ifs == NULL)
-		G.ifs = " \t\n";
+		G.ifs = defifs;
 
  reset:
 #if ENABLE_HUSH_INTERACTIVE
@@ -7727,24 +7729,37 @@ static int FAST_FUNC builtin_pwd(char **argv UNUSED_PARAM)
 
 static int FAST_FUNC builtin_read(char **argv)
 {
-	char *string;
-	const char *name = "REPLY";
+	const char *r;
+	char *opt_n = NULL;
+	char *opt_p = NULL;
+	char *opt_t = NULL;
+	char *opt_u = NULL;
+	int read_flags;
 
-	if (argv[1]) {
-		name = argv[1];
-		/* bash (3.2.33(1)) bug: "read 0abcd" will execute,
-		 * and _after_ that_ it will complain */
-		if (!is_well_formed_var_name(name, '\0')) {
-			/* Mimic bash message */
-			bb_error_msg("read: '%s': not a valid identifier", name);
-			return 1;
-		}
-	}
+	/* "!": do not abort on errors.
+	 * Option string must start with "sr" to match BUILTIN_READ_xxx
+	 */
+	read_flags = getopt32(argv, "!srn:p:t:u:", &opt_n, &opt_p, &opt_t, &opt_u);
+	if (read_flags == (uint32_t)-1)
+		return EXIT_FAILURE;
+	argv += optind;
 
-//TODO: bash unbackslashes input, splits words and puts them in argv[i]
+	r = shell_builtin_read(set_local_var_from_halves,
+		argv,
+		get_local_var_value("IFS"), /* can be NULL */
+		read_flags,
+		opt_n,
+		opt_p,
+		opt_t,
+		opt_u
+	);
+
+	if ((uintptr_t)r > 1) {
+		bb_error_msg("%s", r);
+		r = (char*)(uintptr_t)1;
+	}
 
-	string = xmalloc_reads(STDIN_FILENO, xasprintf("%s=", name), NULL);
-	return set_local_var(string, /*exp:*/ 0, /*lvl:*/ 0, /*ro:*/ 0);
+	return (uintptr_t)r;
 }
 
 /* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#set
diff --git a/shell/hush_test/hush-read/read_REPLY.right b/shell/hush_test/hush-read/read_REPLY.right
new file mode 100644
index 0000000..59f5d54
--- /dev/null
+++ b/shell/hush_test/hush-read/read_REPLY.right
@@ -0,0 +1,5 @@
+test 1: |  abc1  def  |
+test 2: |  \abc2  d\ef  |
+test 3: |abc3  def|
+test 4: |\abc4  d\ef|
+Done
diff --git a/shell/hush_test/hush-read/read_REPLY.tests b/shell/hush_test/hush-read/read_REPLY.tests
new file mode 100755
index 0000000..ba20cae
--- /dev/null
+++ b/shell/hush_test/hush-read/read_REPLY.tests
@@ -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
diff --git a/shell/hush_test/hush-read/read_ifs.right b/shell/hush_test/hush-read/read_ifs.right
new file mode 100644
index 0000000..b523344
--- /dev/null
+++ b/shell/hush_test/hush-read/read_ifs.right
@@ -0,0 +1,10 @@
+test 1: .a. .b. .c.
+test 2: .a. .b. .c.
+test 3: .a. .. .b,c.
+test 4: .a. .. .b,c.
+test 5: .a. .. .c.
+test 6: .a. .. .c. .d.
+test 7: .a. .. .b,c,d  ,  ,.
+test 8: .. .a. .b. .c.
+test 9: .a. .b. .c. ..
+test A: .. .a. .. .b. .c.
diff --git a/shell/hush_test/hush-read/read_ifs.tests b/shell/hush_test/hush-read/read_ifs.tests
new file mode 100755
index 0000000..6e83112
--- /dev/null
+++ b/shell/hush_test/hush-read/read_ifs.tests
@@ -0,0 +1,10 @@
+printf 'a\t\tb\tc\n' | ( IFS=$(printf "\t") read a b c;  echo "test 1: .$a. .$b. .$c." )
+printf 'a\t\tb\tc\n' | ( IFS=$(printf " \t") read a b c; echo "test 2: .$a. .$b. .$c." )
+printf 'a,,b,c\n'    | ( IFS="," read a b c;  echo "test 3: .$a. .$b. .$c." )
+printf 'a,,b,c\n'    | ( IFS=" ," read a b c; echo "test 4: .$a. .$b. .$c." )
+printf 'a ,, c\n'    | ( IFS=" ," read a b c; echo "test 5: .$a. .$b. .$c." )
+printf 'a ,, c d\n'  | ( IFS=" ," read a b c d;     echo "test 6: .$a. .$b. .$c. .$d." )
+printf ' a,,b,c,d  ,  ,\n' | ( IFS=" ," read a b c; echo "test 7: .$a. .$b. .$c." )
+printf '\t,\ta\t,\tb\tc'   | ( IFS=$(printf " \t,") read a b c d;   echo "test 8: .$a. .$b. .$c. .$d." )
+printf '\t\ta\t,\tb\tc'    | ( IFS=$(printf " \t,") read a b c d;   echo "test 9: .$a. .$b. .$c. .$d." )
+printf '\t,\ta\t,,\tb\tc'  | ( IFS=$(printf " \t,") read a b c d e; echo "test A: .$a. .$b. .$c. .$d. .$e." )
diff --git a/shell/hush_test/hush-read/read_n.right b/shell/hush_test/hush-read/read_n.right
new file mode 100644
index 0000000..1f81af0
--- /dev/null
+++ b/shell/hush_test/hush-read/read_n.right
@@ -0,0 +1,3 @@
+test
+tes
+tes
diff --git a/shell/hush_test/hush-read/read_n.tests b/shell/hush_test/hush-read/read_n.tests
new file mode 100755
index 0000000..12423ba
--- /dev/null
+++ b/shell/hush_test/hush-read/read_n.tests
@@ -0,0 +1,3 @@
+echo 'test' | (read reply; echo "$reply")
+echo 'test' | (read -n 3 reply; echo "$reply")
+echo 'test' | (read -n3 reply; echo "$reply")
diff --git a/shell/hush_test/hush-read/read_r.right b/shell/hush_test/hush-read/read_r.right
new file mode 100644
index 0000000..3536bf7
--- /dev/null
+++ b/shell/hush_test/hush-read/read_r.right
@@ -0,0 +1,2 @@
+testbest
+test\
diff --git a/shell/hush_test/hush-read/read_r.tests b/shell/hush_test/hush-read/read_r.tests
new file mode 100755
index 0000000..2c4cc61
--- /dev/null
+++ b/shell/hush_test/hush-read/read_r.tests
@@ -0,0 +1,2 @@
+echo -e 'test\\\nbest' | (read reply; echo "$reply")
+echo -e 'test\\\nbest' | (read -r reply; echo "$reply")
diff --git a/shell/hush_test/hush-read/read_t.right b/shell/hush_test/hush-read/read_t.right
new file mode 100644
index 0000000..04126cb
--- /dev/null
+++ b/shell/hush_test/hush-read/read_t.right
@@ -0,0 +1,4 @@
+><
+><
+>test<
+>test<
diff --git a/shell/hush_test/hush-read/read_t.tests b/shell/hush_test/hush-read/read_t.tests
new file mode 100755
index 0000000..d65f1ae
--- /dev/null
+++ b/shell/hush_test/hush-read/read_t.tests
@@ -0,0 +1,10 @@
+# bash 3.2 outputs:
+
+# ><
+{ echo -n 'te'; sleep 2; echo 'st'; }   | (read -t 1 reply; echo ">$reply<")
+# ><
+{               sleep 2; echo 'test'; } | (read -t 1 reply; echo ">$reply<")
+# >test<
+{ echo -n 'te'; sleep 1; echo 'st'; }   | (read -t 2 reply; echo ">$reply<")
+# >test<
+{               sleep 1; echo 'test'; } | (read -t 2 reply; echo ">$reply<")
diff --git a/shell/match.h b/shell/match.h
index 98ff874..c022ceb 100644
--- a/shell/match.h
+++ b/shell/match.h
@@ -5,6 +5,8 @@
 
 PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
 
+//TODO! Why ash.c still uses internal version?!
+
 typedef char *(*scan_t)(char *string, char *match, bool match_at_left);
 
 char *scanleft(char *string, char *match, bool match_at_left);
diff --git a/shell/math.c b/shell/math.c
index 76159b2..91fb28f 100644
--- a/shell/math.c
+++ b/shell/math.c
@@ -25,14 +25,6 @@
  *
  * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
  */
-#include "libbb.h"
-#include "math.h"
-
-#define a_e_h_t arith_eval_hooks_t
-#define lookupvar (math_hooks->lookupvar)
-#define setvar (math_hooks->setvar)
-#define endofname (math_hooks->endofname)
-
 /* Copyright (c) 2001 Aaron Lehmann <aaronl@vitelus.com>
 
    Permission is hereby granted, free of charge, to any person obtaining
@@ -99,7 +91,6 @@
  * whitespace chars should be considered.  Look below the "#include"s for a
  * precompiler test.
  */
-
 /*
  * Aug 26, 2001              Manuel Novoa III
  *
@@ -109,7 +100,6 @@
  * modified slightly to take account of my changes to the code.
  *
  */
-
 /*
  *  (C) 2003 Vladimir Oleynik <dzo@simtreas.ru>
  *
@@ -126,6 +116,13 @@
  * - protect $((num num)) as true zero expr (Manuel`s error)
  * - always use special isspace(), see comment from bash ;-)
  */
+#include "libbb.h"
+#include "math.h"
+
+#define a_e_h_t arith_eval_hooks_t
+#define lookupvar (math_hooks->lookupvar)
+#define setvar    (math_hooks->setvar   )
+#define endofname (math_hooks->endofname)
 
 #define arith_isspace(arithval) \
 	(arithval == ' ' || arithval == '\n' || arithval == '\t')
@@ -420,7 +417,7 @@ arith_apply(operator op, v_n_t *numstack, v_n_t **numstackptr, a_e_h_t *math_hoo
 		}
 		/* save to shell variable */
 		sprintf(buf, arith_t_fmt, rez);
-		setvar(numptr_m1->var, buf, 0);
+		setvar(numptr_m1->var, buf);
 		/* after saving, make previous value for v++ or v-- */
 		if (op == TOK_POST_INC)
 			rez--;
diff --git a/shell/math.h b/shell/math.h
index 7b7898e..2b0b2b8 100644
--- a/shell/math.h
+++ b/shell/math.h
@@ -87,12 +87,13 @@ typedef long arith_t;
 #define strto_arith_t strtoul
 #endif
 
-typedef const char *(*arith_var_lookup_t)(const char *name);
-typedef void (*arith_var_set_t)(const char *name, const char *val, int flags);
-typedef char *(*arith_var_endofname_t)(const char *name);
+typedef const char* FAST_FUNC (*arith_var_lookup_t)(const char *name);
+typedef void        FAST_FUNC (*arith_var_set_t)(const char *name, const char *val);
+typedef char*       FAST_FUNC (*arith_var_endofname_t)(const char *name);
+
 typedef struct arith_eval_hooks {
-	arith_var_lookup_t lookupvar;
-	arith_var_set_t setvar;
+	arith_var_lookup_t    lookupvar;
+	arith_var_set_t       setvar;
 	arith_var_endofname_t endofname;
 } arith_eval_hooks_t;