Back out all POSIXified *env() changes.

Not because I admit they are technically wrong and not because of bug
reports (I receive nothing). But because I surprisingly meets so
strong opposition and resistance so lost any desire to continue that.

Anyone who interested in POSIX can dig out what changes and how
through cvs diffs.

bin/df/df.c

@@ -131,14 +131,14 @@ main(int argc, char *argv[])
 			 */
 			if (kflag)
 				break;
-			putenv(strdup("BLOCKSIZE=512"));
+			putenv("BLOCKSIZE=512");
 			hflag = 0;
 			break;
 		case 'c':
 			cflag = 1;
 			break;
 		case 'g':
-			putenv(strdup("BLOCKSIZE=1g"));
+			putenv("BLOCKSIZE=1g");
 			hflag = 0;
 			break;
 		case 'H':
@@ -152,7 +152,7 @@ main(int argc, char *argv[])
 			break;
 		case 'k':
 			kflag++;
-			putenv(strdup("BLOCKSIZE=1024"));
+			putenv("BLOCKSIZE=1024");
 			hflag = 0;
 			break;
 		case 'l':
@@ -162,7 +162,7 @@ main(int argc, char *argv[])
 			lflag = 1;
 			break;
 		case 'm':
-			putenv(strdup("BLOCKSIZE=1m"));
+			putenv("BLOCKSIZE=1m");
 			hflag = 0;
 			break;
 		case 'n':

bin/sh/var.c

@@ -319,7 +319,7 @@ setvareq(char *s, int flags)
 			if (vp == &vmpath || (vp == &vmail && ! mpathset()))
 				chkmail(1);
 			if ((vp->flags & VEXPORT) && localevar(s)) {
-				(void) putenv(savestr(s));
+				putenv(s);
 				(void) setlocale(LC_ALL, "");
 			}
 			INTON;
@@ -335,7 +335,7 @@ setvareq(char *s, int flags)
 	INTOFF;
 	*vpp = vp;
 	if ((vp->flags & VEXPORT) && localevar(s)) {
-		(void) putenv(savestr(s));
+		putenv(s);
 		(void) setlocale(LC_ALL, "");
 	}
 	INTON;
@@ -596,7 +596,7 @@ exportcmd(int argc, char **argv)
 
 						vp->flags |= flag;
 						if ((vp->flags & VEXPORT) && localevar(vp->text)) {
-							(void) putenv(savestr(vp->text));
+							putenv(vp->text);
 							(void) setlocale(LC_ALL, "");
 						}
 						goto found;
@@ -776,7 +776,6 @@ unsetcmd(int argc __unused, char **argv __unused)
 int
 unsetvar(char *s)
 {
-	char *eqp, *ss;
 	struct var **vpp;
 	struct var *vp;
 
@@ -789,11 +788,7 @@ unsetvar(char *s)
 			if (*(strchr(vp->text, '=') + 1) != '\0')
 				setvar(s, nullstr, 0);
 			if ((vp->flags & VEXPORT) && localevar(vp->text)) {
-				ss = savestr(s);
-				if ((eqp = strchr(ss, '=')) != NULL)
-					*eqp = '\0';
-				(void) unsetenv(ss);
-				ckfree(ss);
+				unsetenv(s);
 				setlocale(LC_ALL, "");
 			}
 			vp->flags &= ~VEXPORT;

include/stdlib.h

@@ -161,7 +161,7 @@ void	 _Exit(int) __dead2;
 int	 posix_memalign(void **, size_t, size_t); /* (ADV) */
 int	 rand_r(unsigned *);			/* (TSF) */
 int	 setenv(const char *, const char *, int);
-int	 unsetenv(const char *);
+void	 unsetenv(const char *);
 #endif
 
 /*
@@ -197,7 +197,7 @@ long	 mrand48(void);
 long	 nrand48(unsigned short[3]);
 int	 posix_openpt(int);
 char	*ptsname(int);
-int	 putenv(char *);
+int	 putenv(const char *);
 long	 random(void);
 char	*realpath(const char *, char resolved_path[]);
 unsigned short

lib/libc/stdlib/getenv.3

@@ -32,7 +32,7 @@
 .\"     @(#)getenv.3	8.2 (Berkeley) 12/11/93
 .\" $FreeBSD$
 .\"
-.Dd April 30, 2007
+.Dd October 12, 2006
 .Dt GETENV 3
 .Os
 .Sh NAME
@@ -50,13 +50,22 @@
 .Ft int
 .Fn setenv "const char *name" "const char *value" "int overwrite"
 .Ft int
-.Fn putenv "char *string"
-.Ft int
+.Fn putenv "const char *string"
+.Ft void
 .Fn unsetenv "const char *name"
 .Sh DESCRIPTION
 These functions set, unset and fetch environment variables from the
 host
 .Em environment list .
+For compatibility with differing environment conventions,
+the given arguments
+.Fa name
+and
+.Fa value
+may be appended and prepended,
+respectively,
+with an equal sign
+.Dq Li \&= .
 .Pp
 The
 .Fn getenv
@@ -88,18 +97,11 @@ to the given
 .Pp
 The
 .Fn putenv
-function takes an argument of the form ``name=value'' and
-puts it directly into the current environment,
-so altering the argument shall change the environment.
-If the variable
-.Fa name
-does not exist in the list,
-it is inserted with the given
-.Fa value .
-If the variable
-.Fa name
-does exist, it is reset to the given
-.Fa value .
+function takes an argument of the form ``name=value'' and is
+equivalent to:
+.Bd -literal -offset indent
+setenv(name, value, 1);
+.Ed
 .Pp
 The
 .Fn unsetenv
@@ -119,21 +121,9 @@ is not in the current environment,
 .Dv NULL
 is returned.
 .Pp
-.Rv -std setenv putenv unsetenv
+.Rv -std setenv putenv
 .Sh ERRORS
 .Bl -tag -width Er
-.It Bq Er EINVAL
-The function
-.Fn setenv
-or
-.Fn unsetenv
-failed because the
-.Fa name
-is a
-.Dv NULL
-pointer, points to an empty string, or points to a string containing an
-.Dq Li \&=
-character.
 .It Bq Er ENOMEM
 The function
 .Fn setenv
@@ -151,13 +141,6 @@ The
 .Fn getenv
 function conforms to
 .St -isoC .
-The
-.Fn setenv ,
-.Fn putenv
-and
-.Fn unsetenv
-functions conforms to
-.St -p1003.1-2001 .
 .Sh HISTORY
 The functions
 .Fn setenv

lib/libc/stdlib/getenv.c

@@ -43,7 +43,7 @@ inline char *__findenv(const char *, int *);
  * __findenv --
  *	Returns pointer to value associated with name, if any, else NULL.
  *	Sets offset to be the offset of the name/value combination in the
- *      environmental array, for use by putenv(3), setenv(3) and unsetenv(3).
+ *	environmental array, for use by setenv(3) and unsetenv(3).
  *	Explicitly removes '=' in argument name.
  *
  *	This routine *should* be a static; don't use it.
@@ -58,7 +58,7 @@ __findenv(name, offset)
 	const char *np;
 	char **p, *cp;
 
-	if (environ == NULL)
+	if (name == NULL || environ == NULL)
 		return (NULL);
 	for (np = name; *np && *np != '='; ++np)
 		continue;
@@ -85,8 +85,5 @@ getenv(name)
 {
 	int offset;
 
-	if (name == NULL || !*name || strchr(name, '=') != NULL)
-		return (NULL);
-
 	return (__findenv(name, &offset));
 }

lib/libc/stdlib/putenv.c

@@ -33,50 +33,24 @@ static char sccsid[] = "@(#)putenv.c	8.2 (Berkeley) 3/27/94";
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#include <errno.h>
 #include <stdlib.h>
 #include <string.h>
 
-extern char **__alloced;        /* if allocated space before */
-
-char *__findenv(const char *, int *);
-
 int
 putenv(str)
-	char *str;
+	const char *str;
 {
-	extern char **environ;
-	char *eq;
-	int offset;
+	char *p, *equal;
+	int rval;
 
-	if (str == NULL || (eq = strchr(str, '=')) == NULL || eq == str) {
-		errno = EINVAL;
+	if ((p = strdup(str)) == NULL)
+		return (-1);
+	if ((equal = index(p, '=')) == NULL) {
+		(void)free(p);
 		return (-1);
 	}
-
-	/* Trimmed version of setenv(3). */
-	if (__findenv(str, &offset) == NULL) {
-		int cnt;
-		char **p;
-
-		for (p = environ, cnt = 0; *p; ++p, ++cnt);
-		if (__alloced == environ) {                       /* just increase size */
-			p = (char **)realloc((char *)environ,
-			    (size_t)(sizeof(char *) * (cnt + 2)));
-			if (!p)
-				return (-1);
-		}
-		else {				/* get new space */
-						/* copy old entries into it */
-			p = (char **)malloc((size_t)(sizeof(char *) * (cnt + 2)));
-			if (!p)
-				return (-1);
-			bcopy(environ, p, cnt * sizeof(char *));
-		}
-		__alloced = environ = p;
-		environ[cnt + 1] = NULL;
-		offset = cnt;
-	}
-	environ[offset] = str;
-	return (0);
+	*equal = '\0';
+	rval = setenv(p, equal + 1, 1);
+	(void)free(p);
+	return (rval);
 }

lib/libc/stdlib/setenv.c

@@ -33,13 +33,10 @@ static char sccsid[] = "@(#)setenv.c	8.1 (Berkeley) 6/4/93";
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-#include <errno.h>
 #include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
 
-char **__alloced;       /* if allocated space before */
-
 char *__findenv(const char *, int *);
 
 /*
@@ -54,14 +51,12 @@ setenv(name, value, rewrite)
 	int rewrite;
 {
 	extern char **environ;
+	static char **alloced;			/* if allocated space before */
 	char *c;
 	int l_value, offset;
 
-	if (name == NULL || !*name || strchr(name, '=') != NULL) {
-		errno = EINVAL;
-		return (-1);
-	}
-
+	if (*value == '=')			/* no `=' in value */
+		++value;
 	l_value = strlen(value);
 	if ((c = __findenv(name, &offset))) {	/* find if already exists */
 		if (!rewrite)
@@ -75,25 +70,27 @@ setenv(name, value, rewrite)
 		char **p;
 
 		for (p = environ, cnt = 0; *p; ++p, ++cnt);
-		if (__alloced == environ) {                       /* just increase size */
+		if (alloced == environ) {			/* just increase size */
 			p = (char **)realloc((char *)environ,
 			    (size_t)(sizeof(char *) * (cnt + 2)));
 			if (!p)
 				return (-1);
+			alloced = environ = p;
 		}
 		else {				/* get new space */
 						/* copy old entries into it */
-			p = (char **)malloc((size_t)(sizeof(char *) * (cnt + 2)));
+			p = malloc((size_t)(sizeof(char *) * (cnt + 2)));
 			if (!p)
 				return (-1);
 			bcopy(environ, p, cnt * sizeof(char *));
+			alloced = environ = p;
 		}
-		__alloced = environ = p;
 		environ[cnt + 1] = NULL;
 		offset = cnt;
 	}
+	for (c = (char *)name; *c && *c != '='; ++c);	/* no `=' in name */
 	if (!(environ[offset] =			/* name + `=' + value */
-	    (char *)malloc((size_t)(strlen(name) + l_value + 2))))
+	    malloc((size_t)((int)(c - name) + l_value + 2))))
 		return (-1);
 	for (c = environ[offset]; (*c = *name++) && *c != '='; ++c);
 	for (*c++ = '='; (*c++ = *value++); );
@@ -104,22 +101,16 @@ setenv(name, value, rewrite)
  * unsetenv(name) --
  *	Delete environmental variable "name".
  */
-int
+void
 unsetenv(name)
 	const char *name;
 {
 	extern char **environ;
 	char **p;
 	int offset;
 
-	if (name == NULL || !*name || strchr(name, '=') != NULL) {
-		errno = EINVAL;
-		return (-1);
-	}
-
 	while (__findenv(name, &offset))	/* if set multiple times */
 		for (p = &environ[offset];; ++p)
 			if (!(*p = *(p + 1)))
 				break;
-	return (0);
 }

libexec/pppoed/pppoed.c

@@ -258,7 +258,7 @@ Spawn(const char *prog, const char *acname, const char *provider,
   struct ng_mesg *rep = (struct ng_mesg *)msgbuf;
   struct ngpppoe_sts *sts = (struct ngpppoe_sts *)(msgbuf + sizeof *rep);
   struct ngpppoe_init_data *data;
-  char env[18], unknown[14], sessionid[5], *path;
+  char env[sizeof(HISMACADDR)+18], unknown[14], sessionid[5], *path;
   unsigned char *macaddr;
   const char *msg;
   int ret, slen;
@@ -352,11 +352,11 @@ Spawn(const char *prog, const char *acname, const char *provider,
       /* Put the peer's MAC address in the environment */
       if (sz >= sizeof(struct ether_header)) {
         macaddr = ((struct ether_header *)request)->ether_shost;
-	snprintf(env, sizeof(env), "%x:%x:%x:%x:%x:%x",
+        snprintf(env, sizeof(env), "%s=%x:%x:%x:%x:%x:%x", HISMACADDR,
                  macaddr[0], macaddr[1], macaddr[2], macaddr[3], macaddr[4],
                  macaddr[5]);
-	if (setenv(HISMACADDR, env, 1) != 0)
-	  syslog(LOG_INFO, "setenv: cannot set %s: %m", HISMACADDR);
+        if (putenv(env) != 0)
+          syslog(LOG_INFO, "putenv: cannot set %s: %m", env);
       }
 
       /* And send our request data to the waiting node */