X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=shell%2Fmsh.c;h=60fc1dc347e29168719552ed3dda73fb7b899bf9;hb=008c01915b69b006da92b986dd6fea6edb3c3097;hp=66c3d54d34518de8a18b4acc5203b3f0eb4013e8;hpb=ff9eee475f61800fe33bd60ac12b8b29015cbcdd;p=oweals%2Fbusybox.git

diff --git a/shell/msh.c b/shell/msh.c
index 66c3d54d3..60fc1dc34 100644
--- a/shell/msh.c
+++ b/shell/msh.c
@@ -52,6 +52,7 @@
 #define	LINELIM	2100
 #define	NPUSH	8	/* limit to input nesting */
 
+#undef NOFILE
 #define	NOFILE	20	/* Number of open files */
 #define	NUFILE	10	/* Number of user-accessible files */
 #define	FDBASE	10	/* First file usable by Shell */
@@ -143,7 +144,7 @@ static int newfile(char *s);
 static char *findeq(char *cp);
 static char *cclass(char *p, int sub);
 static void initarea(void);
-extern int shell_main(int argc, char **argv);
+extern int msh_main(int argc, char **argv);
 
 
 struct	brkcon {
@@ -213,7 +214,8 @@ static	char	*elinep;
 /*
  * other functions
  */
-static int (*inbuilt(char *s ))(void);
+static int(*inbuilt(char *s))(struct op *);
+
 
 static char *rexecve (char *c , char **v, char **envp );
 static char *space (int n );
@@ -394,7 +396,7 @@ struct ioarg {
 
 /* an input generator's state */
 struct	io {
-	int	(*iofn)();
+	int	(*iofn)(struct  ioarg *, struct io *);
 	struct	ioarg	*argp;
 	int	peekc;
 	char	prev;		/* previous character read by readc() */
@@ -429,7 +431,7 @@ static void freehere (int area );
 static void gethere (void);
 static void markhere (char *s, struct ioword *iop );
 static int herein (char *hname, int xdoll );
-static int run (struct ioarg *argp, int (*f)());
+static int run (struct ioarg *argp, int (*f)(struct ioarg *));
 
 /*
  * IO functions
@@ -446,7 +448,7 @@ static void closeall (void);
 /*
  * IO control
  */
-static void pushio (struct ioarg *argp, int (*fn)());
+static void pushio (struct ioarg *argp, int (*f)(struct ioarg *));
 static int remap (int fd );
 static int openpipe (int *pv );
 static void closepipe (int *pv );
@@ -496,7 +498,8 @@ static void echo(char **wp );
 static struct op **find1case (struct op *t, char *w );
 static struct op *findcase (struct op *t, char *w );
 static void brkset(struct brkcon *bc );
-static int dolabel(void);
+static int dolabel(struct op *t );
+static int dohelp(struct op *t );
 static int dochdir(struct op *t );
 static int doshift(struct op *t );
 static int dologin(struct op *t );
@@ -508,7 +511,7 @@ static int doread(struct op *t );
 static int doeval(struct op *t );
 static int dotrap(struct op *t );
 static int getsig(char *s );
-static void setsig (int n, void (*f)());
+static void setsig (int n, sighandler_t f);
 static int getn(char *as );
 static int dobreak(struct op *t );
 static int docontinue(struct op *t );
@@ -516,11 +519,11 @@ static int brkcontin (char *cp, int val );
 static int doexit(struct op *t );
 static int doexport(struct op *t );
 static int doreadonly(struct op *t );
-static void rdexp (char **wp, void (*f)(), int key);
+static void rdexp (char **wp, void (*f)(struct var *), int key);
 static void badid(char *s );
 static int doset(struct op *t );
 static void varput (char *s, int out );
-static int dotimes(void);
+static int dotimes(struct op *t );
 static int expand (char *cp, struct wdblock **wbp, int f );
 static char *blank(int f );
 static int dollar(int quoted );
@@ -534,7 +537,7 @@ static void glob1 (char *base, char *lim );
 static void glob2 (char *i, char *j );
 static void glob3 (char *i, char *j, char *k );
 static void readhere (char **name, char *s, int ec );
-static void pushio(struct ioarg *argp, int (*fn)());
+static void pushio (struct ioarg *argp, int (*f)(struct ioarg *));
 static int xxchar(struct ioarg *ap );
 
 struct	here {
@@ -592,30 +595,31 @@ static struct res restab[] = {
 };
 
 
-struct	builtin {
-	char *command;
-	int	 (*fn)();
+struct builtincmd {
+	const char *name;
+	int (*builtinfunc)(struct op *t);
 };
-static struct	builtin	builtin[] = {
+static const struct	builtincmd	builtincmds[] = {
+    {".",		dodot},
     {":",		dolabel},
-    {"cd",		dochdir},
-    {"shift",	doshift},
-    {"exec",	doexec},
-    {"wait",	dowait},
-    {"read",	doread},
-    {"eval",	doeval},
-    {"trap",	dotrap},
     {"break",	dobreak},
+    {"cd",		dochdir},
     {"continue",docontinue},
+    {"eval",	doeval},
+    {"exec",	doexec},
     {"exit",	doexit},
     {"export",	doexport},
-    {"readonly",doreadonly},
-    {"set",		doset},
-    {".",		dodot},
-    {"umask",	doumask},
+    {"help",	dohelp},
     {"login",	dologin},
     {"newgrp",	dologin},
+    {"read",	doread},
+    {"readonly",doreadonly},
+    {"set",		doset},
+    {"shift",	doshift},
     {"times",	dotimes},
+    {"trap",	dotrap},
+    {"umask",	doumask},
+    {"wait",	dowait},
     {0,0}
 };
 
@@ -679,9 +683,8 @@ static void * brktop;
 static void * brkaddr;
 
 
-#ifdef BB_FEATURE_COMMAND_EDITING
-char * current_prompt;
-unsigned int shell_context;
+#ifdef CONFIG_FEATURE_COMMAND_EDITING
+static char * current_prompt;
 #endif
 
 
@@ -691,13 +694,13 @@ unsigned int shell_context;
  */
 
 
-extern int shell_main(int argc, char **argv)
+extern int msh_main(int argc, char **argv)
 {
 	register int f;
 	register char *s;
 	int cflag;
 	char *name, **ap;
-	int (*iof)();
+	int (*iof)(struct ioarg *);
 
 	initarea();
 	if ((ap = environ) != NULL) {
@@ -731,14 +734,18 @@ extern int shell_main(int argc, char **argv)
 		setval(ifs, " \t\n");
 
 	prompt = lookup("PS1");
+#ifdef CONFIG_FEATURE_SH_FANCY_PROMPT
 	if (prompt->value == null)
+#endif
 		setval(prompt, "$ ");
 	if (geteuid() == 0) {
 		setval(prompt, "# ");
 		prompt->status &= ~EXPORT;
 	}
 	cprompt = lookup("PS2");
+#ifdef CONFIG_FEATURE_SH_FANCY_PROMPT
 	if (cprompt->value == null)
+#endif
 		setval(cprompt, "> ");
 
 	iof = filechar;
@@ -794,8 +801,13 @@ extern int shell_main(int argc, char **argv)
 	setdash();
 	if (e.iop < iostack) {
 		PUSHIO(afile, 0, iof);
-		if (isatty(0) && isatty(1) && !cflag)
+		if (isatty(0) && isatty(1) && !cflag) {
 			interactive++;
+#ifndef CONFIG_FEATURE_SH_EXTRA_QUIET 
+			printf( "\n\n" BB_BANNER " Built-in shell (msh)\n");
+			printf( "Enter 'help' for a list of built-in commands.\n\n");
+#endif
+		}
 	}
 	signal(SIGQUIT, qflag);
 	if (name && name[0] == '-') {
@@ -825,13 +837,15 @@ extern int shell_main(int argc, char **argv)
 
 	for (;;) {
 		if (interactive && e.iop <= iostack) {
-#ifdef BB_FEATURE_COMMAND_EDITING
+#ifdef CONFIG_FEATURE_COMMAND_EDITING
 			current_prompt=prompt->value;
 #else
 			prs(prompt->value);
 #endif
 		}
 		onecommand();
+		/* Ensure that getenv("PATH") stays current */
+		setenv("PATH", path->value, 1);
 	}
 }
 
@@ -1062,8 +1076,7 @@ int n;
 }
 
 static void
-next(f)
-int f;
+next(int f)
 {
 	PUSHIO(afile, f, filechar);
 }
@@ -1253,7 +1266,7 @@ static void
 ronly(vp)
 struct var *vp;
 {
-	if (isalpha(vp->name[0]))	/* not an internal symbol ($# etc) */
+	if (isalpha(vp->name[0]) || vp->name[0] == '_')	/* not an internal symbol */
 		vp->status |= RONLY;
 }
 
@@ -1261,10 +1274,10 @@ static int
 isassign(s)
 register char *s;
 {
-	if (!isalpha((int)*s))
+	if (!isalpha((int)*s) && *s != '_')
 		return(0);
 	for (; *s != '='; s++)
-		if (*s == 0 || !isalnum(*s))
+		if (*s == 0 || (!isalnum(*s) && *s != '_'))
 			return(0);
 	return(1);
 }
@@ -1277,10 +1290,10 @@ int cf;
 	register char *cp;
 	struct var *vp;
 
-	if (!isalpha(*s))
+	if (!isalpha(*s) && *s != '_')
 		return(0);
 	for (cp = s; *cp != '='; cp++)
-		if (*cp == 0 || !isalnum(*cp))
+		if (*cp == 0 || (!isalnum(*cp) && *cp != '_'))
 			return(0);
 	vp = lookup(s);
 	nameval(vp, ++cp, cf == COPYV? (char *)NULL: s);
@@ -1293,10 +1306,10 @@ static int
 checkname(cp)
 register char *cp;
 {
-	if (!isalpha(*cp++))
+	if (!isalpha(*cp++) && *(cp-1) != '_')
 		return(0);
 	while (*cp)
-		if (!isalnum(*cp++))
+		if (!isalnum(*cp++) && *(cp-1) != '_')
 			return(0);
 	return(1);
 }
@@ -1308,7 +1321,7 @@ register int f, out;
 	register struct var *vp;
 
 	for (vp = vlist; vp; vp = vp->next)
-		if (vp->status & f && isalpha(*vp->name)) {
+		if (vp->status & f && (isalpha(*vp->name) || *vp->name == '_')) {
 			if (vp->status & EXPORT)
 				write(out, "export ", 7);
 			if (vp->status & RONLY)
@@ -2161,7 +2174,7 @@ loop:
 		startl = 1;
 		if (multiline || cf & CONTIN) {
 			if (interactive && e.iop <= iostack) {
-#ifdef BB_FEATURE_COMMAND_EDITING
+#ifdef CONFIG_FEATURE_COMMAND_EDITING
 			current_prompt=cprompt->value;
 #else
 			prs(cprompt->value);
@@ -2214,7 +2227,7 @@ register int c, c1;
 			return(YYERRCODE);
 		}
 		if (interactive && c == '\n' && e.iop <= iostack) {
-#ifdef BB_FEATURE_COMMAND_EDITING
+#ifdef CONFIG_FEATURE_COMMAND_EDITING
 		    current_prompt=cprompt->value;
 #else
 		    prs(cprompt->value);
@@ -2314,14 +2327,14 @@ int act;
 	switch(t->type) {
 	case TPAREN:
 	case TCOM:
-	    {
-		int child;
-		rv = forkexec(t, pin, pout, act, wp, &child);
-		if (child) {
-			exstat = rv;
-			leave();
+		{
+			int child;
+			rv = forkexec(t, pin, pout, act, wp, &child);
+			if (child) {
+				exstat = rv;
+				leave();
+			}
 		}
-	    }
 		break;
 
 	case TPIPE:
@@ -2466,7 +2479,7 @@ static int
 forkexec( register struct op *t, int *pin, int *pout, int act, char **wp, int *pforked)
 {
 	int i, rv;
-	int (*shcom)() = NULL;
+	int (*shcom)(struct op *) = NULL;
 	register int f;
 	char *cp = NULL;
 	struct ioword **iopp;
@@ -2828,6 +2841,21 @@ char *c, **v, **envp;
 	register char *sp, *tp;
 	int eacces = 0, asis = 0;
 
+#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
+	char *name = c;
+#ifdef CONFIG_FEATURE_SH_APPLETS_ALWAYS_WIN
+	name = get_last_path_component(name);
+#endif
+	optind = 1;
+	if (find_applet_by_name(name)) {
+		/* We have to exec here since we vforked.  Running 
+		 * run_applet_by_name() won't work and bad things
+		 * will happen. */
+		execve("/proc/self/exe", v, envp);
+		execve("busybox", v, envp);
+	}
+#endif
+
 	sp = any('/', c)? "": path->value;
 	asis = *sp == '\0';
 	while (asis || *sp != '\0') {
@@ -2842,6 +2870,7 @@ char *c, **v, **envp;
 			*tp++ = '/';
 		for (i = 0; (*tp++ = c[i++]) != '\0';)
 			;
+
 		execve(e.linep, v, envp);
 		switch (errno) {
 		case ENOEXEC:
@@ -2871,9 +2900,7 @@ char *c, **v, **envp;
  * applied to stream `arg'.
  */
 static int
-run(argp, f)
-struct ioarg *argp;
-int (*f)();
+run(struct ioarg *argp, int (*f)(struct ioarg *))
 {
 	struct op *otree;
 	struct wdblock *swdlist;
@@ -2917,8 +2944,50 @@ int (*f)();
  * built-in commands: doX
  */
 
-static int
-dolabel()
+static int dohelp(struct op *t )
+{
+	int col;
+	const struct builtincmd *x;
+
+	printf("\nBuilt-in commands:\n");
+	printf("-------------------\n");
+
+	for (col=0, x = builtincmds; x->builtinfunc != NULL; x++) {
+		if (!x->name)
+			continue;
+		col += printf("%s%s", ((col == 0) ? "\t" : " "), x->name);
+		if (col > 60) {
+			printf("\n");
+			col = 0;
+		}
+	}
+#ifdef CONFIG_FEATURE_SH_STANDALONE_SHELL
+	{
+		int i;
+		const struct BB_applet *applet;
+		extern const struct BB_applet applets[];
+		extern const size_t NUM_APPLETS;
+
+		for (i=0, applet = applets; i < NUM_APPLETS; applet++, i++) {
+			if (!applet->name)
+				continue;
+		
+			col += printf("%s%s", ((col == 0) ? "\t" : " "), 
+					applet->name);
+			if (col > 60) {
+				printf("\n");
+				col = 0;
+			}
+		}
+	}
+#endif
+	printf("\n\n");
+	return EXIT_SUCCESS;
+}
+
+
+
+static int dolabel(struct op *t )
 {
 	return(0);
 }
@@ -3155,7 +3224,7 @@ char *s;
 }
 
 static void
-setsig( register int n, void (*f)(int))
+setsig( register int n, sighandler_t f)
 {
 	if (n == 0)
 		return;
@@ -3256,18 +3325,22 @@ struct op *t;
 	return(0);
 }
 
-static void
-rdexp(wp, f, key)
-register char **wp;
-void (*f)();
-int key;
+static void rdexp (char **wp, void (*f)(struct var *), int key)
 {
 	if (*wp != NULL) {
-		for (; *wp != NULL; wp++)
+		for (; *wp != NULL; wp++) {
+			if (isassign(*wp)) {
+				char *cp;
+				assign(*wp, COPYV);
+				for (cp = *wp; *cp != '='; cp++)
+					;
+				*cp = '\0';
+			}
 			if (checkname(*wp))
 				(*f)(lookup(*wp));
 			else
 				badid(*wp);
+		}
 	} else
 		putvlist(key, 1);
 }
@@ -3331,7 +3404,7 @@ varput(s, out)
 register char *s;
 int out;
 {
-	if (isalnum(*s)) {
+	if (isalnum(*s) || *s == '_') {
 		write(out, s, strlen(s));
 		write(out, "\n", 1);
 	}
@@ -3341,9 +3414,8 @@ int out;
 /*
  * Copyright (c) 1999 Herbert Xu <herbert@debian.org>
  * This file contains code for the times builtin.
- * $Id: msh.c,v 1.1 2001/06/29 04:57:14 andersen Exp $
  */
-static int dotimes ()
+static int dotimes(struct op *t )
 {
 	struct tms buf;
 	long int clk_tck = sysconf(_SC_CLK_TCK);
@@ -3362,15 +3434,15 @@ static int dotimes ()
 }
 
 
-static int (*inbuilt(s))()
-register char *s;
+static int(*inbuilt(char *s))(struct op *)
 {
-	register struct builtin *bp;
+	const struct builtincmd *bp;
+
+	for (bp = builtincmds; bp->name != NULL; bp++)
+		if (strcmp(bp->name, s) == 0)
+			return(bp->builtinfunc);
 
-	for (bp = builtin; bp->command != NULL; bp++)
-		if (strcmp(bp->command, s) == 0)
-			return(bp->fn);
-	return((int(*)())NULL);
+	return(NULL);
 }
 
 /* -------- eval.c -------- */
@@ -3539,7 +3611,7 @@ loop:
 		c = 0;
 	}
 	unget(c);
-	if (!isalpha(c))
+	if (!isalpha(c) && c != '_')
 		scanequals = 0;
 	for (;;) {
 		c = subgetc('"', foundequals);
@@ -3557,7 +3629,7 @@ loop:
 				foundequals = 1;
 				scanequals  = 0;
 			}
-			else if (!isalnum(c))
+			else if (!isalnum(c) && c != '_')
 				scanequals = 0;
 		}
 		*e.linep++ = c;
@@ -3610,8 +3682,8 @@ int quoted;
 	s = e.linep;
 	if (c != '{') {
 		*e.linep++ = c;
-		if (isalpha(c)) {
-			while ((c = readc())!=0 && isalnum(c))
+		if (isalpha(c) || c == '_') {
+			while ((c = readc())!=0 && (isalnum(c) || c == '_'))
 				if (e.linep < elinep)
 					*e.linep++ = c;
 			unget(c);
@@ -3725,7 +3797,7 @@ int quoted;
 	if (i != 0) {
 		e.iop->argp->aword = ++cp;
 		close(pf[1]);
-		PUSHIO(afile, remap(pf[0]), quoted? qgravechar: gravechar);
+		PUSHIO(afile, remap(pf[0]), (int(*)(struct ioarg *))((quoted)? qgravechar: gravechar));
 		return(1);
 	}
 	*cp = 0;
@@ -4180,7 +4252,7 @@ readc()
 			if (multiline)
 			    return e.iop->prev = 0;
 			if (interactive && e.iop == iostack+1) {
-#ifdef BB_FEATURE_COMMAND_EDITING
+#ifdef CONFIG_FEATURE_COMMAND_EDITING
 			    current_prompt=prompt->value;
 #else
 			    prs(prompt->value);
@@ -4204,9 +4276,7 @@ char c;
 }
 
 static void
-pushio(argp, fn)
-struct ioarg *argp;
-int (*fn)();
+pushio(struct ioarg *argp, int (*fn)(struct ioarg *))
 {
 	if (++e.iop >= &iostack[NPUSH]) {
 		e.iop--;
@@ -4214,7 +4284,7 @@ int (*fn)();
 		gflg++;
 		return;
 	}
-	e.iop->iofn = fn;
+	e.iop->iofn = (int (*)(struct  ioarg *, struct io *))fn;
 
 	if (argp->afid != AFID_NOBUF)
 	  e.iop->argp = argp;
@@ -4237,7 +4307,7 @@ int (*fn)();
 	e.iop->nlcount = 0;
 	if (fn == filechar || fn == linechar)
 		e.iop->task = XIO;
-	else if (fn == gravechar || fn == qgravechar)
+	else if (fn == (int(*)(struct ioarg *))gravechar || fn == (int(*)(struct ioarg *))qgravechar)
 		e.iop->task = XGRAVE;
 	else
 		e.iop->task = XOTHER;
@@ -4374,9 +4444,7 @@ register struct ioarg *ap;
 	  if ((i = ap->afid != bp->id) || bp->bufp == bp->ebufp) {
 	    if (i)
 	      lseek(ap->afile, ap->afpos, 0);
-	    do {
-	      i = read(ap->afile, bp->buf, sizeof(bp->buf));
-	    } while (i < 0 && errno == EINTR);
+	    i = safe_read(ap->afile, bp->buf, sizeof(bp->buf));
 	    if (i <= 0) {
 	      closef(ap->afile);
 	      return 0;
@@ -4388,14 +4456,13 @@ register struct ioarg *ap;
 	  return *bp->bufp++ & 0177;
 	}
 
-#ifdef BB_FEATURE_COMMAND_EDITING
+#ifdef CONFIG_FEATURE_COMMAND_EDITING
 	if (interactive) {
 	    static char mycommand[BUFSIZ];
 	    static int position = 0, size = 0;
 
 	    while (size == 0 || position >= size) {
 		cmdedit_read_input(current_prompt, mycommand);
-		cmdedit_terminate();
 		size = strlen(mycommand);
 		position = 0;
 	    }
@@ -4405,9 +4472,7 @@ register struct ioarg *ap;
 	} else 
 #endif
 	{
-		do {
-			i = read(ap->afile, &c, sizeof(c));
-		} while (i < 0 && errno == EINTR);
+		i = safe_read(ap->afile, &c, sizeof(c));
 		return(i == sizeof(c)? c&0177: (closef(ap->afile), 0));
 	}
 }
@@ -4646,11 +4711,11 @@ int ec;
 	if (newenv(setjmp(errpt = ev)) != 0)
 		unlink(tname);
 	else {
-		pushio(e.iop->argp, e.iop->iofn);
+		pushio(e.iop->argp, (int(*)(struct ioarg *))e.iop->iofn);
 		e.iobase = e.iop;
 		for (;;) {
 		    if (interactive && e.iop <= iostack) {
-#ifdef BB_FEATURE_COMMAND_EDITING
+#ifdef CONFIG_FEATURE_COMMAND_EDITING
 			    current_prompt=cprompt->value;
 #else
 			    prs(cprompt->value);