diff options
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | Src/exec.c | 9 | ||||
| -rw-r--r-- | Src/params.c | 69 | ||||
| -rw-r--r-- | Src/system.h | 9 | ||||
| -rw-r--r-- | configure.ac | 2 |
5 files changed, 88 insertions, 7 deletions
@@ -1,3 +1,9 @@ +2007-07-30 Peter Stephenson <p.w.stephenson@ntlworld.com> + + * 23725: configure.ac, Src/exec.c, Src/params.c, Src/system.h: + use setenv() and unsetenv() for memory management of the + environment where possible. + 2007-07-29 Clint Adams <clint@zsh.org> * 23720: Completion/Unix/Command/_dvi: handle arguments to dvips -P diff --git a/Src/exec.c b/Src/exec.c index ad088001e..baabf1b87 100644 --- a/Src/exec.c +++ b/Src/exec.c @@ -524,7 +524,16 @@ execute(LinkList args, int flags, int defpath) * that as argv[0] for this external command */ if (unset(RESTRICTED) && (z = zgetenv("ARGV0"))) { setdata(firstnode(args), (void *) ztrdup(z)); + /* + * Note we don't do anything with the parameter structure + * for ARGV0: that's OK since we're about to exec or exit + * on failure. + */ +#ifdef HAVE_UNSETENV + unsetenv("ARGV0"); +#else delenvvalue(z - 6); +#endif } else if (flags & BINF_DASH) { /* Else if the pre-command `-' was given, we add `-' * * to the front of argv[0] for this command. */ diff --git a/Src/params.c b/Src/params.c index a962f850c..080b1fca4 100644 --- a/Src/params.c +++ b/Src/params.c @@ -610,7 +610,7 @@ void createparamtable(void) { Param ip, pm; -#ifndef HAVE_PUTENV +#if !defined(HAVE_PUTENV) && !defined(HAVE_SETENV) char **new_environ; int envsize; #endif @@ -665,7 +665,7 @@ createparamtable(void) setsparam("LOGNAME", ztrdup((str = getlogin()) && *str ? str : cached_username)); -#ifndef HAVE_PUTENV +#if !defined(HAVE_PUTENV) && !defined(HAVE_SETENV) /* Copy the environment variables we are inheriting to dynamic * * memory, so we can do mallocs and frees on it. */ envsize = sizeof(char *)*(1 + arrlen(environ)); @@ -3855,6 +3855,30 @@ arrfixenv(char *s, char **t) int zputenv(char *str) { +#ifdef HAVE_SETENV + /* + * If we are using unsetenv() to remove values from the + * environment, which is the safe thing to do, we + * need to use setenv() to put them there in the first place. + * Unfortunately this is a slightly different interface + * from what zputenv() assumes. + */ + char *ptr; + int ret; + + for (ptr = str; *ptr && *ptr != '='; ptr++) + ; + if (*ptr) { + *ptr = '\0'; + ret = setenv(str, ptr+1, 1); + *ptr = '='; + } else { + /* safety first */ + DPUTS(1, "bad environment string"); + ret = setenv(str, ptr, 1); + } + return ret; +#else #ifdef HAVE_PUTENV return putenv(str); #else @@ -3878,9 +3902,12 @@ zputenv(char *str) } return 0; #endif +#endif } /**/ +#ifndef HAVE_UNSETENV +/**/ static int findenv(char *name, int *pos) { @@ -3899,6 +3926,8 @@ findenv(char *name, int *pos) return 0; } +/**/ +#endif /* Given *name = "foo", it searches the environment for string * * "foo=bar", and returns a pointer to the beginning of "bar" */ @@ -3939,14 +3968,20 @@ copyenvstr(char *s, char *value, int flags) void addenv(Param pm, char *value) { - char *oldenv = 0, *newenv = 0, *env = 0; + char *newenv = 0; +#ifndef HAVE_UNSETENV + char *oldenv = 0, *env = 0; int pos; +#endif - /* First check if there is already an environment * - * variable matching string `name'. If not, and * - * we are not requested to add new, return */ +#ifndef HAVE_UNSETENV + /* + * First check if there is already an environment + * variable matching string `name'. + */ if (findenv(pm->node.nam, &pos)) oldenv = environ[pos]; +#endif newenv = mkenvstr(pm->node.nam, value, pm->node.flags); if (zputenv(newenv)) { @@ -3954,6 +3989,19 @@ addenv(Param pm, char *value) pm->env = NULL; return; } +#ifdef HAVE_UNSETENV + /* + * If we are using setenv/unsetenv to manage the environment, + * we simply store the string we created in pm->env since + * memory management of the environment is handled entirely + * by the system. + * + * TODO: is this good enough to fix problem cases from + * the other branch? If so, we don't actually need to + * store pm->env at all, just a flag that the value was set. + */ + pm->env = newenv; +#else /* * Under Cygwin we must use putenv() to maintain consistency. * Unfortunately, current version (1.1.2) copies argument and may @@ -3973,6 +4021,7 @@ addenv(Param pm, char *value) DPUTS(1, "addenv should never reach the end"); pm->env = NULL; +#endif } @@ -4003,6 +4052,7 @@ mkenvstr(char *name, char *value, int flags) * string. */ +#ifndef HAVE_UNSETENV /**/ void delenvvalue(char *x) @@ -4018,6 +4068,8 @@ delenvvalue(char *x) } zsfree(x); } +#endif + /* Delete a pointer from the list of pointers to environment * * variables by shifting all the other pointers up one slot. */ @@ -4026,7 +4078,12 @@ delenvvalue(char *x) void delenv(Param pm) { +#ifdef HAVE_UNSETENV + unsetenv(pm->node.nam); + zsfree(pm->env); +#else delenvvalue(pm->env); +#endif pm->env = NULL; /* * Note we don't remove PM_EXPORT from the flags. This diff --git a/Src/system.h b/Src/system.h index 97db9aab1..af66687fa 100644 --- a/Src/system.h +++ b/Src/system.h @@ -693,6 +693,15 @@ struct timezone { extern char **environ; +/* + * We always need setenv and unsetenv in pairs, because + * we don't know how to do memory management on the values set. + */ +#ifndef HAVE_UNSETENV +#undef HAVE_SETENV +#endif + + /* These variables are sometimes defined in, * * and needed by, the termcap library. */ #if MUST_DEFINE_OSPEED diff --git a/configure.ac b/configure.ac index b3ebfe339..ef555571c 100644 --- a/configure.ac +++ b/configure.ac @@ -1126,7 +1126,7 @@ AC_CHECK_FUNCS(strftime strptime mktime timelocal \ setlocale \ uname \ signgam \ - putenv getenv \ + putenv getenv setenv unsetenv xw\ brk sbrk \ pathconf sysconf \ tgetent tigetflag tigetnum tigetstr setupterm \ |