mirror of
https://github.com/sheumann/hush.git
synced 2024-06-04 05:29:30 +00:00
Fix the behavior of local shell variables to match that of bash and ash.
-Erik
This commit is contained in:
Eric Andersen
parent
9abfe85e96
commit
f72f562b2f
134
hush.c
134
hush.c
|
|
@ -55,7 +55,6 @@
|
|||
* to-do:
|
||||
* port selected bugfixes from post-0.49 busybox lash - done?
|
||||
* finish implementing reserved words: for, while, until, do, done
|
||||
* finish implementing local variable assignment
|
||||
* change { and } from special chars to reserved words
|
||||
* builtins: break, continue, eval, return, set, trap, ulimit
|
||||
* test magic exec
|
||||
|
|
@ -325,6 +324,7 @@ static int builtin_help(struct child_prog *child);
|
|||
static int builtin_jobs(struct child_prog *child);
|
||||
static int builtin_pwd(struct child_prog *child);
|
||||
static int builtin_read(struct child_prog *child);
|
||||
static int builtin_set(struct child_prog *child);
|
||||
static int builtin_shift(struct child_prog *child);
|
||||
static int builtin_source(struct child_prog *child);
|
||||
static int builtin_umask(struct child_prog *child);
|
||||
|
|
@ -388,6 +388,11 @@ static void checkjobs();
|
|||
static void insert_bg_job(struct pipe *pi);
|
||||
static void remove_bg_job(struct pipe *pi);
|
||||
static void free_pipe(struct pipe *pi);
|
||||
/* local variable support */
|
||||
static char *get_local_var(const char *var);
|
||||
static int set_local_var(const char *s);
|
||||
static void unset_local_var(const char *name);
|
||||
|
||||
|
||||
/* Table of built-in functions. They can be forked or not, depending on
|
||||
* context: within pipes, they fork. As simple commands, they do not.
|
||||
|
|
@ -402,7 +407,8 @@ static struct built_in_command bltins[] = {
|
|||
{"continue", "Continue for, while or until loop", builtin_not_written},
|
||||
{"env", "Print all environment variables", builtin_env},
|
||||
{"eval", "Construct and run shell command", builtin_not_written},
|
||||
{"exec", "Exec command, replacing this shell with the exec'd process", builtin_exec},
|
||||
{"exec", "Exec command, replacing this shell with the exec'd process",
|
||||
builtin_exec},
|
||||
{"exit", "Exit from shell()", builtin_exit},
|
||||
{"export", "Set environment variable", builtin_export},
|
||||
{"fg", "Bring job into the foreground", builtin_fg_bg},
|
||||
|
|
@ -410,7 +416,7 @@ static struct built_in_command bltins[] = {
|
|||
{"pwd", "Print current directory", builtin_pwd},
|
||||
{"read", "Input environment variable", builtin_read},
|
||||
{"return", "Return from a function", builtin_not_written},
|
||||
{"set", "Set/unset shell options", builtin_not_written},
|
||||
{"set", "Set/unset shell local variables", builtin_set},
|
||||
{"shift", "Shift positional parameters", builtin_shift},
|
||||
{"trap", "Trap signals", builtin_not_written},
|
||||
{"ulimit","Controls resource limits", builtin_not_written},
|
||||
|
|
@ -472,16 +478,41 @@ static int builtin_exit(struct child_prog *child)
|
|||
static int builtin_export(struct child_prog *child)
|
||||
{
|
||||
int res;
|
||||
char *value, *name = child->argv[1];
|
||||
|
||||
if (child->argv[1] == NULL) {
|
||||
if (name == NULL) {
|
||||
return (builtin_env(child));
|
||||
}
|
||||
/* FIXME -- I leak memory. This will be
|
||||
* fixed up properly when we add local
|
||||
* variable support -- I hope */
|
||||
res = putenv(strdup(child->argv[1]));
|
||||
|
||||
value = strchr(name, '=');
|
||||
if (!value) {
|
||||
/* They are exporting something without an =VALUE.
|
||||
* Assume this is a local shell variable they are exporting */
|
||||
name = get_local_var(name);
|
||||
if (! name ) {
|
||||
error_msg("export failed");
|
||||
return (EXIT_FAILURE);
|
||||
}
|
||||
/* FIXME -- I leak memory!!!!! */
|
||||
value = malloc(strlen(child->argv[1]) + strlen(name) + 2);
|
||||
sprintf(value, "%s=%s", child->argv[1], name);
|
||||
} else {
|
||||
/* Bourne shells always put exported variables into the
|
||||
* local shell variable list. Do that first... */
|
||||
set_local_var(name);
|
||||
/* FIXME -- I leak memory!!!!! */
|
||||
value = strdup(name);
|
||||
}
|
||||
|
||||
/* FIXME -- I leak memory!!!!!
|
||||
* It seems most putenv implementations place the very char* pointer
|
||||
* we pass in directly into the environ array, so the memory holding
|
||||
* this string has to be persistant. We can't even use the memory for
|
||||
* the local shell variable list, since where that memory is keeps
|
||||
* changing due to reallocs... */
|
||||
res = putenv(value);
|
||||
if (res)
|
||||
fprintf(stderr, "export: %s\n", strerror(errno));
|
||||
perror_msg("export");
|
||||
return (res);
|
||||
}
|
||||
|
||||
|
|
@ -616,6 +647,27 @@ static int builtin_read(struct child_prog *child)
|
|||
return (res);
|
||||
}
|
||||
|
||||
/* built-in 'set VAR=value' handler */
|
||||
static int builtin_set(struct child_prog *child)
|
||||
{
|
||||
int res;
|
||||
char *temp = child->argv[1];
|
||||
|
||||
if (child->argv[1] == NULL) {
|
||||
char **e = __shell_local_env;
|
||||
if (e == NULL) return EXIT_FAILURE;
|
||||
for (; *e; e++) {
|
||||
puts(*e);
|
||||
}
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
res = set_local_var(temp);
|
||||
if (res)
|
||||
fprintf(stderr, "set: %s\n", strerror(errno));
|
||||
return (res);
|
||||
}
|
||||
|
||||
|
||||
/* Built-in 'shift' handler */
|
||||
static int builtin_shift(struct child_prog *child)
|
||||
{
|
||||
|
|
@ -685,6 +737,7 @@ static int builtin_unset(struct child_prog *child)
|
|||
return EXIT_FAILURE;
|
||||
}
|
||||
unsetenv(child->argv[1]);
|
||||
unset_local_var(child->argv[1]);
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
|
|
@ -1610,7 +1663,27 @@ static int xglob(o_string *dest, int flags, glob_t *pglob)
|
|||
return gr;
|
||||
}
|
||||
|
||||
/* This is used to set local variables (i.e. stuff not going into the environment) */
|
||||
/* This is used to get/check local shell variables */
|
||||
static char *get_local_var(const char *s)
|
||||
{
|
||||
char **p;
|
||||
int len;
|
||||
|
||||
if (!s)
|
||||
return NULL;
|
||||
if (!__shell_local_env)
|
||||
return NULL;
|
||||
len = strlen(s);
|
||||
|
||||
for (p = __shell_local_env; *p; p++) {
|
||||
if (memcmp(s, *p, len) == 0 && (*p)[len] == '=') {
|
||||
return *p + len + 1;
|
||||
}
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* This is used to set local shell variables */
|
||||
static int set_local_var(const char *s)
|
||||
{
|
||||
char **ep;
|
||||
|
|
@ -1653,7 +1726,8 @@ static int set_local_var(const char *s)
|
|||
result = -1;
|
||||
goto done_already;
|
||||
}
|
||||
memcpy((__ptr_t) new_environ, (__ptr_t) __shell_local_env, size * sizeof(char *));
|
||||
memcpy((__ptr_t) new_environ, (__ptr_t) __shell_local_env,
|
||||
size * sizeof(char *));
|
||||
|
||||
new_environ[size] = malloc (namelen + 1 + vallen + 1);
|
||||
if (new_environ[size] == NULL) {
|
||||
|
|
@ -1688,26 +1762,35 @@ static int set_local_var(const char *s)
|
|||
memcpy (&(*ep)[namelen + 1], value, vallen + 1);
|
||||
}
|
||||
|
||||
/* One last little detail... If this variable is already
|
||||
* in the environment we must set it there as well... */
|
||||
tmp = getenv(name);
|
||||
if (tmp) {
|
||||
/* FIXME -- I leak memory!!!!! */
|
||||
putenv(strdup(s));
|
||||
}
|
||||
|
||||
done_already:
|
||||
free(name);
|
||||
return result;
|
||||
}
|
||||
|
||||
char *get_local_var(const char *var)
|
||||
static void unset_local_var(const char *name)
|
||||
{
|
||||
char **p;
|
||||
int len;
|
||||
char **ep, **dp;
|
||||
size_t namelen;
|
||||
|
||||
len = strlen(var);
|
||||
|
||||
if (!__shell_local_env)
|
||||
return 0;
|
||||
|
||||
for (p = __shell_local_env; *p; p++) {
|
||||
if (memcmp(var, *p, len) == 0 && (*p)[len] == '=')
|
||||
return *p + len + 1;
|
||||
if (!name)
|
||||
return;
|
||||
namelen = strlen(name);
|
||||
for (dp = ep = __shell_local_env; ep && *ep != NULL; ++ep) {
|
||||
if (memcmp (*ep, name, namelen)==0 && (*ep)[namelen] == '=') {
|
||||
*dp = *ep;
|
||||
++dp;
|
||||
*ep = NULL;
|
||||
break;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int is_assignment(const char *s)
|
||||
|
|
@ -2112,8 +2195,9 @@ static void lookup_param(o_string *dest, struct p_context *ctx, o_string *src)
|
|||
{
|
||||
const char *p=NULL;
|
||||
if (src->data) {
|
||||
p = get_local_var(src->data);
|
||||
if (!p) p = getenv(src->data);
|
||||
p = getenv(src->data);
|
||||
if (!p)
|
||||
p = get_local_var(src->data);
|
||||
}
|
||||
if (p) parse_string(dest, ctx, p); /* recursion */
|
||||
b_free(src);
|
||||
|
|
|
|||
134
shell/hush.c
134
shell/hush.c
|
|
@ -55,7 +55,6 @@
|
|||
* to-do:
|
||||
* port selected bugfixes from post-0.49 busybox lash - done?
|
||||
* finish implementing reserved words: for, while, until, do, done
|
||||
* finish implementing local variable assignment
|
||||
* change { and } from special chars to reserved words
|
||||
* builtins: break, continue, eval, return, set, trap, ulimit
|
||||
* test magic exec
|
||||
|
|
@ -325,6 +324,7 @@ static int builtin_help(struct child_prog *child);
|
|||
static int builtin_jobs(struct child_prog *child);
|
||||
static int builtin_pwd(struct child_prog *child);
|
||||
static int builtin_read(struct child_prog *child);
|
||||
static int builtin_set(struct child_prog *child);
|
||||
static int builtin_shift(struct child_prog *child);
|
||||
static int builtin_source(struct child_prog *child);
|
||||
static int builtin_umask(struct child_prog *child);
|
||||
|
|
@ -388,6 +388,11 @@ static void checkjobs();
|
|||
static void insert_bg_job(struct pipe *pi);
|
||||
static void remove_bg_job(struct pipe *pi);
|
||||
static void free_pipe(struct pipe *pi);
|
||||
/* local variable support */
|
||||
static char *get_local_var(const char *var);
|
||||
static int set_local_var(const char *s);
|
||||
static void unset_local_var(const char *name);
|
||||
|
||||
|
||||
/* Table of built-in functions. They can be forked or not, depending on
|
||||
* context: within pipes, they fork. As simple commands, they do not.
|
||||
|
|
@ -402,7 +407,8 @@ static struct built_in_command bltins[] = {
|
|||
{"continue", "Continue for, while or until loop", builtin_not_written},
|
||||
{"env", "Print all environment variables", builtin_env},
|
||||
{"eval", "Construct and run shell command", builtin_not_written},
|
||||
{"exec", "Exec command, replacing this shell with the exec'd process", builtin_exec},
|
||||
{"exec", "Exec command, replacing this shell with the exec'd process",
|
||||
builtin_exec},
|
||||
{"exit", "Exit from shell()", builtin_exit},
|
||||
{"export", "Set environment variable", builtin_export},
|
||||
{"fg", "Bring job into the foreground", builtin_fg_bg},
|
||||
|
|
@ -410,7 +416,7 @@ static struct built_in_command bltins[] = {
|
|||
{"pwd", "Print current directory", builtin_pwd},
|
||||
{"read", "Input environment variable", builtin_read},
|
||||
{"return", "Return from a function", builtin_not_written},
|
||||
{"set", "Set/unset shell options", builtin_not_written},
|
||||
{"set", "Set/unset shell local variables", builtin_set},
|
||||
{"shift", "Shift positional parameters", builtin_shift},
|
||||
{"trap", "Trap signals", builtin_not_written},
|
||||
{"ulimit","Controls resource limits", builtin_not_written},
|
||||
|
|
@ -472,16 +478,41 @@ static int builtin_exit(struct child_prog *child)
|
|||
static int builtin_export(struct child_prog *child)
|
||||
{
|
||||
int res;
|
||||
char *value, *name = child->argv[1];
|
||||
|
||||
if (child->argv[1] == NULL) {
|
||||
if (name == NULL) {
|
||||
return (builtin_env(child));
|
||||
}
|
||||
/* FIXME -- I leak memory. This will be
|
||||
* fixed up properly when we add local
|
||||
* variable support -- I hope */
|
||||
res = putenv(strdup(child->argv[1]));
|
||||
|
||||
value = strchr(name, '=');
|
||||
if (!value) {
|
||||
/* They are exporting something without an =VALUE.
|
||||
* Assume this is a local shell variable they are exporting */
|
||||
name = get_local_var(name);
|
||||
if (! name ) {
|
||||
error_msg("export failed");
|
||||
return (EXIT_FAILURE);
|
||||
}
|
||||
/* FIXME -- I leak memory!!!!! */
|
||||
value = malloc(strlen(child->argv[1]) + strlen(name) + 2);
|
||||
sprintf(value, "%s=%s", child->argv[1], name);
|
||||
} else {
|
||||
/* Bourne shells always put exported variables into the
|
||||
* local shell variable list. Do that first... */
|
||||
set_local_var(name);
|
||||
/* FIXME -- I leak memory!!!!! */
|
||||
value = strdup(name);
|
||||
}
|
||||
|
||||
/* FIXME -- I leak memory!!!!!
|
||||
* It seems most putenv implementations place the very char* pointer
|
||||
* we pass in directly into the environ array, so the memory holding
|
||||
* this string has to be persistant. We can't even use the memory for
|
||||
* the local shell variable list, since where that memory is keeps
|
||||
* changing due to reallocs... */
|
||||
res = putenv(value);
|
||||
if (res)
|
||||
fprintf(stderr, "export: %s\n", strerror(errno));
|
||||
perror_msg("export");
|
||||
return (res);
|
||||
}
|
||||
|
||||
|
|
@ -616,6 +647,27 @@ static int builtin_read(struct child_prog *child)
|
|||
return (res);
|
||||
}
|
||||
|
||||
/* built-in 'set VAR=value' handler */
|
||||
static int builtin_set(struct child_prog *child)
|
||||
{
|
||||
int res;
|
||||
char *temp = child->argv[1];
|
||||
|
||||
if (child->argv[1] == NULL) {
|
||||
char **e = __shell_local_env;
|
||||
if (e == NULL) return EXIT_FAILURE;
|
||||
for (; *e; e++) {
|
||||
puts(*e);
|
||||
}
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
res = set_local_var(temp);
|
||||
if (res)
|
||||
fprintf(stderr, "set: %s\n", strerror(errno));
|
||||
return (res);
|
||||
}
|
||||
|
||||
|
||||
/* Built-in 'shift' handler */
|
||||
static int builtin_shift(struct child_prog *child)
|
||||
{
|
||||
|
|
@ -685,6 +737,7 @@ static int builtin_unset(struct child_prog *child)
|
|||
return EXIT_FAILURE;
|
||||
}
|
||||
unsetenv(child->argv[1]);
|
||||
unset_local_var(child->argv[1]);
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
|
|
@ -1610,7 +1663,27 @@ static int xglob(o_string *dest, int flags, glob_t *pglob)
|
|||
return gr;
|
||||
}
|
||||
|
||||
/* This is used to set local variables (i.e. stuff not going into the environment) */
|
||||
/* This is used to get/check local shell variables */
|
||||
static char *get_local_var(const char *s)
|
||||
{
|
||||
char **p;
|
||||
int len;
|
||||
|
||||
if (!s)
|
||||
return NULL;
|
||||
if (!__shell_local_env)
|
||||
return NULL;
|
||||
len = strlen(s);
|
||||
|
||||
for (p = __shell_local_env; *p; p++) {
|
||||
if (memcmp(s, *p, len) == 0 && (*p)[len] == '=') {
|
||||
return *p + len + 1;
|
||||
}
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* This is used to set local shell variables */
|
||||
static int set_local_var(const char *s)
|
||||
{
|
||||
char **ep;
|
||||
|
|
@ -1653,7 +1726,8 @@ static int set_local_var(const char *s)
|
|||
result = -1;
|
||||
goto done_already;
|
||||
}
|
||||
memcpy((__ptr_t) new_environ, (__ptr_t) __shell_local_env, size * sizeof(char *));
|
||||
memcpy((__ptr_t) new_environ, (__ptr_t) __shell_local_env,
|
||||
size * sizeof(char *));
|
||||
|
||||
new_environ[size] = malloc (namelen + 1 + vallen + 1);
|
||||
if (new_environ[size] == NULL) {
|
||||
|
|
@ -1688,26 +1762,35 @@ static int set_local_var(const char *s)
|
|||
memcpy (&(*ep)[namelen + 1], value, vallen + 1);
|
||||
}
|
||||
|
||||
/* One last little detail... If this variable is already
|
||||
* in the environment we must set it there as well... */
|
||||
tmp = getenv(name);
|
||||
if (tmp) {
|
||||
/* FIXME -- I leak memory!!!!! */
|
||||
putenv(strdup(s));
|
||||
}
|
||||
|
||||
done_already:
|
||||
free(name);
|
||||
return result;
|
||||
}
|
||||
|
||||
char *get_local_var(const char *var)
|
||||
static void unset_local_var(const char *name)
|
||||
{
|
||||
char **p;
|
||||
int len;
|
||||
char **ep, **dp;
|
||||
size_t namelen;
|
||||
|
||||
len = strlen(var);
|
||||
|
||||
if (!__shell_local_env)
|
||||
return 0;
|
||||
|
||||
for (p = __shell_local_env; *p; p++) {
|
||||
if (memcmp(var, *p, len) == 0 && (*p)[len] == '=')
|
||||
return *p + len + 1;
|
||||
if (!name)
|
||||
return;
|
||||
namelen = strlen(name);
|
||||
for (dp = ep = __shell_local_env; ep && *ep != NULL; ++ep) {
|
||||
if (memcmp (*ep, name, namelen)==0 && (*ep)[namelen] == '=') {
|
||||
*dp = *ep;
|
||||
++dp;
|
||||
*ep = NULL;
|
||||
break;
|
||||
}
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int is_assignment(const char *s)
|
||||
|
|
@ -2112,8 +2195,9 @@ static void lookup_param(o_string *dest, struct p_context *ctx, o_string *src)
|
|||
{
|
||||
const char *p=NULL;
|
||||
if (src->data) {
|
||||
p = get_local_var(src->data);
|
||||
if (!p) p = getenv(src->data);
|
||||
p = getenv(src->data);
|
||||
if (!p)
|
||||
p = get_local_var(src->data);
|
||||
}
|
||||
if (p) parse_string(dest, ctx, p); /* recursion */
|
||||
b_free(src);
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user