mirror of
https://github.com/sheumann/hush.git
synced 2024-07-16 21:29:13 +00:00
This is a patch from Vladimir:
> I rewrite *local_variable* function in hush.c with:
> 1) remove many memory leaks
> 2) add support read_only protect (require write builtin function for set this,
> I write this special for variable HUSH_VERION=0.01)
> 3) commad read set only local variable now
> 4) remove many error messages if "set unset export" not defined variable
> (bash syntax not put and set error code). Hmm, if I set result to -1, you hush
> called waitpid and returned with error "no waitpid" ( i not found place this
> error).
> 5) destroy error in new version check xgetcwd()==NULL and set "(unknow)" -
> this have error: crashe in next call `pwd`, but xgetcwd(not null) called
> free(arg).
> 6) next add integraion with libbb
Valdimir's patch missed two cases of local variable handling
FOO=bar
export FOO=baz
unset FOO
and
export FOO=bar
FOO=baz
which were working before, so I fixed those two cases.
This commit is contained in:
Eric Andersen
parent
6197c51834
commit
9ffb7dd9a4
388
hush.c
388
hush.c
@ -227,6 +227,14 @@ struct close_me {
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struct close_me *next;
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};
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struct variables {
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char *name;
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char *value;
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int flg_export;
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int flg_read_only;
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struct variables *next;
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};
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/* globals, connect us to the outside world
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* the first three support $?, $#, and $1 */
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char **global_argv;
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@ -248,13 +256,14 @@ static const char *cwd;
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static struct jobset *job_list;
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static unsigned int last_bg_pid;
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static char *PS1;
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static char *PS2;
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static char **__shell_local_env;
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static char PS2[] = "> ";
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struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
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struct variables *top_vars = &shell_ver;
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#define B_CHUNK (100)
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#define B_NOSPAC 1
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#define MAX_LINE 256 /* for cwd */
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#define MAX_READ 256 /* for builtin_read */
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typedef struct {
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char *data;
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@ -303,12 +312,12 @@ static void debug_printf(const char *format, ...)
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va_end(args);
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}
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#else
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static void debug_printf(const char *format, ...) { }
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static inline void debug_printf(const char *format, ...) { }
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#endif
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#define final_printf debug_printf
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void __syntax(char *file, int line) {
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fprintf(stderr,"syntax error %s:%d\n",file,line);
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static void __syntax(char *file, int line) {
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error_msg("syntax error %s:%d", file, line);
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}
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#define syntax() __syntax(__FILE__, __LINE__)
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@ -362,7 +371,6 @@ static int globhack(const char *src, int flags, glob_t *pglob);
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static int glob_needed(const char *s);
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static int xglob(o_string *dest, int flags, glob_t *pglob);
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/* variable assignment: */
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static int set_local_var(const char *s);
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static int is_assignment(const char *s);
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/* data structure manipulation: */
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static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
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@ -390,8 +398,8 @@ static void remove_bg_job(struct pipe *pi);
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static void free_pipe(struct pipe *pi);
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/* local variable support */
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static char *get_local_var(const char *var);
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static int set_local_var(const char *s);
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static void unset_local_var(const char *name);
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static int set_local_var(const char *s, int flg_export);
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/* Table of built-in functions. They can be forked or not, depending on
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@ -427,6 +435,17 @@ static struct built_in_command bltins[] = {
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{NULL, NULL, NULL}
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};
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static const char *set_cwd(void)
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{
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if(cwd==unknown)
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cwd = NULL; /* xgetcwd(arg) called free(arg) */
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cwd = xgetcwd((char *)cwd);
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if (!cwd)
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cwd = unknown;
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return cwd;
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}
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/* built-in 'cd <path>' handler */
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static int builtin_cd(struct child_prog *child)
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{
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@ -439,9 +458,7 @@ static int builtin_cd(struct child_prog *child)
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printf("cd: %s: %s\n", newdir, strerror(errno));
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return EXIT_FAILURE;
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}
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cwd = xgetcwd((char *)cwd);
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if (!cwd)
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cwd = unknown;
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set_cwd();
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return EXIT_SUCCESS;
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}
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@ -477,43 +494,48 @@ static int builtin_exit(struct child_prog *child)
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/* built-in 'export VAR=value' handler */
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static int builtin_export(struct child_prog *child)
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{
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int res;
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char *value, *name = child->argv[1];
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int res = 0;
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char *name = child->argv[1];
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if (name == NULL) {
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return (builtin_env(child));
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}
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value = strchr(name, '=');
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if (!value) {
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/* They are exporting something without an =VALUE.
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* Assume this is a local shell variable they are exporting */
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name = get_local_var(name);
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if (! name ) {
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error_msg("export failed");
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return (EXIT_FAILURE);
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}
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/* FIXME -- I leak memory!!!!! */
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value = malloc(strlen(child->argv[1]) + strlen(name) + 2);
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sprintf(value, "%s=%s", child->argv[1], name);
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} else {
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/* Bourne shells always put exported variables into the
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* local shell variable list. Do that first... */
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set_local_var(name);
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/* FIXME -- I leak memory!!!!! */
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value = strdup(name);
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}
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name = strdup(name);
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/* FIXME -- I leak memory!!!!!
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* It seems most putenv implementations place the very char* pointer
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* we pass in directly into the environ array, so the memory holding
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* this string has to be persistant. We can't even use the memory for
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* the local shell variable list, since where that memory is keeps
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* changing due to reallocs... */
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res = putenv(value);
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if (res)
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if(name) {
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char *value = strchr(name, '=');
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if (!value) {
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char *tmp;
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/* They are exporting something without an =VALUE */
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value = get_local_var(name);
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if (value) {
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size_t ln = strlen(name);
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tmp = realloc(name, ln+strlen(value)+2);
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if(tmp==NULL)
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res = -1;
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else {
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sprintf(tmp+ln, "=%s", value);
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name = tmp;
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}
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} else {
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/* bash not put error and set error code
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if exporting not defined variable */
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res = 1;
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}
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}
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}
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if (res<0)
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perror_msg("export");
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return (res);
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else if(res==0)
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res = set_local_var(name, 1);
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else
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res = 0;
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free(name);
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return res;
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}
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/* built-in 'fg' and 'bg' handler */
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@ -605,66 +627,52 @@ static int builtin_jobs(struct child_prog *child)
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/* built-in 'pwd' handler */
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static int builtin_pwd(struct child_prog *dummy)
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{
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cwd = xgetcwd((char *)cwd);
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if (!cwd)
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cwd = unknown;
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puts(cwd);
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puts(set_cwd());
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return EXIT_SUCCESS;
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}
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/* built-in 'read VAR' handler */
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static int builtin_read(struct child_prog *child)
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{
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int res = 0, len, newlen;
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char *s;
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char string[MAX_READ];
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int res;
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if (child->argv[1]) {
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/* argument (VAR) given: put "VAR=" into buffer */
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strcpy(string, child->argv[1]);
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len = strlen(string);
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string[len++] = '=';
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string[len] = '\0';
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/* XXX would it be better to go through in_str? */
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fgets(&string[len], sizeof(string) - len, stdin); /* read string */
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newlen = strlen(string);
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if(newlen > len)
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string[--newlen] = '\0'; /* chomp trailing newline */
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/*
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** string should now contain "VAR=<value>"
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** copy it (putenv() won't do that, so we must make sure
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** the string resides in a static buffer!)
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*/
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res = -1;
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if((s = strdup(string)))
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res = putenv(s);
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if (res)
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fprintf(stderr, "read: %s\n", strerror(errno));
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}
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else
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fgets(string, sizeof(string), stdin);
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char string[BUFSIZ];
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char *var = 0;
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return (res);
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string[0] = 0; /* for correct work if stdin have "only EOF" */
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/* read string */
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fgets(string, sizeof(string), stdin);
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chomp(string);
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var = malloc(strlen(child->argv[1])+strlen(string)+2);
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if(var) {
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sprintf(var, "%s=%s", child->argv[1], string);
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res = set_local_var(var, 0);
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} else
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res = -1;
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if (res)
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fprintf(stderr, "read: %m\n");
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free(var); /* not move up - saved errno */
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return res;
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} else {
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do res=getchar(); while(res!='\n' && res!=EOF);
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return 0;
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}
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}
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/* built-in 'set VAR=value' handler */
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static int builtin_set(struct child_prog *child)
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{
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int res;
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char *temp = child->argv[1];
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struct variables *e;
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if (temp == NULL)
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for(e = top_vars; e; e=e->next)
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printf("%s=%s\n", e->name, e->value);
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else
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set_local_var(temp, 0);
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if (child->argv[1] == NULL) {
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char **e = __shell_local_env;
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if (e == NULL) return EXIT_FAILURE;
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for (; *e; e++) {
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puts(*e);
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}
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return EXIT_SUCCESS;
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}
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res = set_local_var(temp);
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if (res)
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fprintf(stderr, "set: %s\n", strerror(errno));
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return (res);
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}
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@ -697,7 +705,7 @@ static int builtin_source(struct child_prog *child)
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/* XXX search through $PATH is missing */
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input = fopen(child->argv[1], "r");
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if (!input) {
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fprintf(stderr, "Couldn't open file '%s'\n", child->argv[1]);
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error_msg("Couldn't open file '%s'", child->argv[1]);
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return EXIT_FAILURE;
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}
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@ -732,11 +740,7 @@ static int builtin_umask(struct child_prog *child)
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/* built-in 'unset VAR' handler */
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static int builtin_unset(struct child_prog *child)
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{
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if (child->argv[1] == NULL) {
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fprintf(stderr, "unset: parameter required.\n");
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return EXIT_FAILURE;
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}
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unsetenv(child->argv[1]);
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/* bash returned already true */
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unset_local_var(child->argv[1]);
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return EXIT_SUCCESS;
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}
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@ -998,8 +1002,7 @@ static int setup_redirects(struct child_prog *prog, int squirrel[])
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if (openfd < 0) {
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/* this could get lost if stderr has been redirected, but
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bash and ash both lose it as well (though zsh doesn't!) */
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fprintf(stderr,"error opening %s: %s\n", redir->word.gl_pathv[0],
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strerror(errno));
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perror_msg("error opening %s", redir->word.gl_pathv[0]);
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return 1;
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}
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} else {
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@ -1160,10 +1163,9 @@ static void insert_bg_job(struct pipe *pi)
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/* physically copy the struct job */
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memcpy(thejob, pi, sizeof(struct pipe));
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thejob->next = NULL;
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//thejob->num_progs = 0;
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thejob->running_progs = thejob->num_progs;
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thejob->stopped_progs = 0;
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thejob->text = xmalloc(MAX_LINE);
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thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
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//if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0])
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{
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@ -1327,7 +1329,7 @@ static int run_pipe_real(struct pipe *pi)
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if (i!=0 && child->argv[i]==NULL) {
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/* assignments, but no command: set the local environment */
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for (i=0; child->argv[i]!=NULL; i++) {
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set_local_var(child->argv[i]);
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set_local_var(child->argv[i], 0);
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}
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return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
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}
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@ -1646,12 +1648,10 @@ static int xglob(o_string *dest, int flags, glob_t *pglob)
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gr = globhack(dest->data, flags, pglob);
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debug_printf("globhack returned %d\n",gr);
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}
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if (gr == GLOB_NOSPACE) {
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fprintf(stderr,"out of memory during glob\n");
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exit(1);
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}
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if (gr == GLOB_NOSPACE)
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error_msg_and_die("out of memory during glob");
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if (gr != 0) { /* GLOB_ABORTED ? */
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fprintf(stderr,"glob(3) error %d\n",gr);
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error_msg("glob(3) error %d",gr);
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}
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/* globprint(glob_target); */
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return gr;
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@ -1660,129 +1660,113 @@ static int xglob(o_string *dest, int flags, glob_t *pglob)
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/* This is used to get/check local shell variables */
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static char *get_local_var(const char *s)
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{
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char **p;
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int len;
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struct variables *cur;
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|
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if (!s)
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return NULL;
|
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if (!__shell_local_env)
|
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return NULL;
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len = strlen(s);
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|
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for (p = __shell_local_env; *p; p++) {
|
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if (memcmp(s, *p, len) == 0 && (*p)[len] == '=') {
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return *p + len + 1;
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}
|
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}
|
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for (cur = top_vars; cur; cur=cur->next)
|
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if(strcmp(cur->name, s)==0)
|
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return cur->value;
|
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return NULL;
|
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}
|
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|
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/* This is used to set local shell variables */
|
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static int set_local_var(const char *s)
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/* This is used to set local shell variables
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flg_export==0 if only local (not exporting) variable
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flg_export==1 if "new" exporting environ
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flg_export>1 if current startup environ (not call putenv()) */
|
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static int set_local_var(const char *s, int flg_export)
|
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{
|
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char **ep;
|
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char *tmp,*name, *value;
|
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size_t size;
|
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size_t namelen;
|
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size_t vallen;
|
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char *name, *value;
|
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int result=0;
|
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struct variables *cur;
|
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char *newval = 0;
|
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|
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name=tmp=strdup(s);
|
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name=strdup(s);
|
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|
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/* Assume when we enter this function that we are already in
|
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* NAME=VALUE format. So the first order of business is to
|
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* split 's' on the '=' into 'name' and 'value' */
|
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value = strchr(name, '=');
|
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if (!value) {
|
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if (value==0 || (newval = strdup(value+1))==0) {
|
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result = -1;
|
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goto done_already;
|
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}
|
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*value='\0';
|
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++value;
|
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} else {
|
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*value++ = 0;
|
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|
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namelen = strlen (name);
|
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vallen = strlen (value);
|
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|
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/* Now see how many local environment entries we have, and check
|
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* if we match an existing environment entry (so we can overwrite it) */
|
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size = 0;
|
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for (ep = __shell_local_env; ep && *ep != NULL; ++ep) {
|
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if (!memcmp (*ep, name, namelen) && (*ep)[namelen] == '=')
|
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for(cur = top_vars; cur; cur = cur->next)
|
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if(strcmp(cur->name, name)==0)
|
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break;
|
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else
|
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++size;
|
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}
|
||||
|
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if (ep == NULL || *ep == NULL) {
|
||||
static char **last_environ = NULL;
|
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char **new_environ = (char **) malloc((size + 2) * sizeof(char *));
|
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if (new_environ == NULL) {
|
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if(cur) {
|
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if(strcmp(cur->value, value)==0) {
|
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result = cur->flg_export == flg_export;
|
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} else {
|
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if(cur->flg_read_only) {
|
||||
result = -1;
|
||||
goto done_already;
|
||||
error_msg("%s: readonly variable", name);
|
||||
} else {
|
||||
free(cur->value);
|
||||
cur->value = newval;
|
||||
newval = 0; /* protect free */
|
||||
}
|
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memcpy((__ptr_t) new_environ, (__ptr_t) __shell_local_env,
|
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size * sizeof(char *));
|
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|
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new_environ[size] = malloc (namelen + 1 + vallen + 1);
|
||||
if (new_environ[size] == NULL) {
|
||||
free (new_environ);
|
||||
errno=ENOMEM;
|
||||
result = -1;
|
||||
goto done_already;
|
||||
}
|
||||
memcpy (new_environ[size], name, namelen);
|
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new_environ[size][namelen] = '=';
|
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memcpy (&new_environ[size][namelen + 1], value, vallen + 1);
|
||||
|
||||
new_environ[size + 1] = NULL;
|
||||
|
||||
if (last_environ != NULL)
|
||||
free ((__ptr_t) last_environ);
|
||||
last_environ = new_environ;
|
||||
__shell_local_env = new_environ;
|
||||
}
|
||||
else {
|
||||
size_t len = strlen (*ep);
|
||||
if (len < namelen + 1 + vallen) {
|
||||
char *new = malloc (namelen + 1 + vallen + 1);
|
||||
if (new == NULL) {
|
||||
} else {
|
||||
cur = malloc(sizeof(struct variables));
|
||||
if(cur==0) {
|
||||
result = -1;
|
||||
goto done_already;
|
||||
} else {
|
||||
cur->name = strdup(name);
|
||||
if(cur->name == 0) {
|
||||
free(cur);
|
||||
result = -1;
|
||||
} else {
|
||||
struct variables *bottom = top_vars;
|
||||
|
||||
cur->value = newval;
|
||||
newval = 0; /* protect free */
|
||||
cur->next = 0;
|
||||
cur->flg_export = flg_export;
|
||||
cur->flg_read_only = 0;
|
||||
while(bottom->next) bottom=bottom->next;
|
||||
bottom->next = cur;
|
||||
}
|
||||
*ep = new;
|
||||
memcpy (*ep, name, namelen);
|
||||
(*ep)[namelen] = '=';
|
||||
}
|
||||
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:
|
||||
if((result==0 && flg_export==1) || (result>0 && cur->flg_export>0)) {
|
||||
*(value-1) = '=';
|
||||
result = putenv(name);
|
||||
} else {
|
||||
free(name);
|
||||
if(result>0) /* equivalent to previous set */
|
||||
result = 0;
|
||||
}
|
||||
free(newval);
|
||||
return result;
|
||||
}
|
||||
|
||||
static void unset_local_var(const char *name)
|
||||
{
|
||||
char **ep, **dp;
|
||||
size_t namelen;
|
||||
struct variables *cur;
|
||||
|
||||
if (!name)
|
||||
if (name) {
|
||||
for (cur = top_vars; cur; cur=cur->next)
|
||||
if(strcmp(cur->name, name)==0)
|
||||
break;
|
||||
if(cur!=0) {
|
||||
struct variables *next = top_vars;
|
||||
if(cur==next)
|
||||
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;
|
||||
else {
|
||||
if(cur->flg_export)
|
||||
unsetenv(cur->name);
|
||||
free(cur->name);
|
||||
free(cur->value);
|
||||
while (next->next != cur)
|
||||
next = next->next;
|
||||
next->next = cur->next;
|
||||
}
|
||||
free(cur);
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -1963,7 +1947,7 @@ static int done_word(o_string *dest, struct p_context *ctx)
|
||||
if (ctx->pending_redirect) {
|
||||
ctx->pending_redirect=NULL;
|
||||
if (glob_target->gl_pathc != 1) {
|
||||
fprintf(stderr, "ambiguous redirect\n");
|
||||
error_msg("ambiguous redirect");
|
||||
return 1;
|
||||
}
|
||||
} else {
|
||||
@ -2049,7 +2033,7 @@ static int redirect_dup_num(struct in_str *input)
|
||||
}
|
||||
if (ok) return d;
|
||||
|
||||
fprintf(stderr, "ambiguous redirect\n");
|
||||
error_msg("ambiguous redirect");
|
||||
return -2;
|
||||
}
|
||||
|
||||
@ -2261,7 +2245,7 @@ static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *i
|
||||
case '-':
|
||||
case '_':
|
||||
/* still unhandled, but should be eventually */
|
||||
fprintf(stderr,"unhandled syntax: $%c\n",ch);
|
||||
error_msg("unhandled syntax: $%c",ch);
|
||||
return 1;
|
||||
break;
|
||||
default:
|
||||
@ -2505,16 +2489,14 @@ int shell_main(int argc, char **argv)
|
||||
int opt;
|
||||
FILE *input;
|
||||
struct jobset joblist_end = { NULL, NULL };
|
||||
char **e = environ;
|
||||
|
||||
/* (re?) initialize globals */
|
||||
ifs=NULL;
|
||||
fake_mode=0;
|
||||
interactive=0;
|
||||
close_me_head = NULL;
|
||||
/* initialize globals */
|
||||
if (e) {
|
||||
for (; *e; e++)
|
||||
set_local_var(*e, 2); /* without call putenv() */
|
||||
}
|
||||
job_list = &joblist_end;
|
||||
last_bg_pid=0;
|
||||
PS2 = "> ";
|
||||
__shell_local_env = 0;
|
||||
|
||||
last_return_code=EXIT_SUCCESS;
|
||||
|
||||
@ -2581,9 +2563,13 @@ int shell_main(int argc, char **argv)
|
||||
fake_mode++;
|
||||
break;
|
||||
default:
|
||||
#ifndef BB_VER
|
||||
fprintf(stderr, "Usage: sh [FILE]...\n"
|
||||
" or: sh -c command [args]...\n\n");
|
||||
exit(EXIT_FAILURE);
|
||||
#else
|
||||
show_usage();
|
||||
#endif
|
||||
}
|
||||
}
|
||||
/* A shell is interactive if the `-i' flag was given, or if all of
|
||||
|
||||
388
shell/hush.c
388
shell/hush.c
@ -227,6 +227,14 @@ struct close_me {
|
||||
struct close_me *next;
|
||||
};
|
||||
|
||||
struct variables {
|
||||
char *name;
|
||||
char *value;
|
||||
int flg_export;
|
||||
int flg_read_only;
|
||||
struct variables *next;
|
||||
};
|
||||
|
||||
/* globals, connect us to the outside world
|
||||
* the first three support $?, $#, and $1 */
|
||||
char **global_argv;
|
||||
@ -248,13 +256,14 @@ static const char *cwd;
|
||||
static struct jobset *job_list;
|
||||
static unsigned int last_bg_pid;
|
||||
static char *PS1;
|
||||
static char *PS2;
|
||||
static char **__shell_local_env;
|
||||
static char PS2[] = "> ";
|
||||
|
||||
struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
|
||||
|
||||
struct variables *top_vars = &shell_ver;
|
||||
|
||||
#define B_CHUNK (100)
|
||||
#define B_NOSPAC 1
|
||||
#define MAX_LINE 256 /* for cwd */
|
||||
#define MAX_READ 256 /* for builtin_read */
|
||||
|
||||
typedef struct {
|
||||
char *data;
|
||||
@ -303,12 +312,12 @@ static void debug_printf(const char *format, ...)
|
||||
va_end(args);
|
||||
}
|
||||
#else
|
||||
static void debug_printf(const char *format, ...) { }
|
||||
static inline void debug_printf(const char *format, ...) { }
|
||||
#endif
|
||||
#define final_printf debug_printf
|
||||
|
||||
void __syntax(char *file, int line) {
|
||||
fprintf(stderr,"syntax error %s:%d\n",file,line);
|
||||
static void __syntax(char *file, int line) {
|
||||
error_msg("syntax error %s:%d", file, line);
|
||||
}
|
||||
#define syntax() __syntax(__FILE__, __LINE__)
|
||||
|
||||
@ -362,7 +371,6 @@ static int globhack(const char *src, int flags, glob_t *pglob);
|
||||
static int glob_needed(const char *s);
|
||||
static int xglob(o_string *dest, int flags, glob_t *pglob);
|
||||
/* variable assignment: */
|
||||
static int set_local_var(const char *s);
|
||||
static int is_assignment(const char *s);
|
||||
/* data structure manipulation: */
|
||||
static int setup_redirect(struct p_context *ctx, int fd, redir_type style, struct in_str *input);
|
||||
@ -390,8 +398,8 @@ 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);
|
||||
static int set_local_var(const char *s, int flg_export);
|
||||
|
||||
|
||||
/* Table of built-in functions. They can be forked or not, depending on
|
||||
@ -427,6 +435,17 @@ static struct built_in_command bltins[] = {
|
||||
{NULL, NULL, NULL}
|
||||
};
|
||||
|
||||
static const char *set_cwd(void)
|
||||
{
|
||||
if(cwd==unknown)
|
||||
cwd = NULL; /* xgetcwd(arg) called free(arg) */
|
||||
cwd = xgetcwd((char *)cwd);
|
||||
if (!cwd)
|
||||
cwd = unknown;
|
||||
return cwd;
|
||||
}
|
||||
|
||||
|
||||
/* built-in 'cd <path>' handler */
|
||||
static int builtin_cd(struct child_prog *child)
|
||||
{
|
||||
@ -439,9 +458,7 @@ static int builtin_cd(struct child_prog *child)
|
||||
printf("cd: %s: %s\n", newdir, strerror(errno));
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
cwd = xgetcwd((char *)cwd);
|
||||
if (!cwd)
|
||||
cwd = unknown;
|
||||
set_cwd();
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
@ -477,43 +494,48 @@ static int builtin_exit(struct child_prog *child)
|
||||
/* built-in 'export VAR=value' handler */
|
||||
static int builtin_export(struct child_prog *child)
|
||||
{
|
||||
int res;
|
||||
char *value, *name = child->argv[1];
|
||||
int res = 0;
|
||||
char *name = child->argv[1];
|
||||
|
||||
if (name == NULL) {
|
||||
return (builtin_env(child));
|
||||
}
|
||||
|
||||
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);
|
||||
}
|
||||
name = 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)
|
||||
if(name) {
|
||||
char *value = strchr(name, '=');
|
||||
|
||||
if (!value) {
|
||||
char *tmp;
|
||||
/* They are exporting something without an =VALUE */
|
||||
|
||||
value = get_local_var(name);
|
||||
if (value) {
|
||||
size_t ln = strlen(name);
|
||||
|
||||
tmp = realloc(name, ln+strlen(value)+2);
|
||||
if(tmp==NULL)
|
||||
res = -1;
|
||||
else {
|
||||
sprintf(tmp+ln, "=%s", value);
|
||||
name = tmp;
|
||||
}
|
||||
} else {
|
||||
/* bash not put error and set error code
|
||||
if exporting not defined variable */
|
||||
res = 1;
|
||||
}
|
||||
}
|
||||
}
|
||||
if (res<0)
|
||||
perror_msg("export");
|
||||
return (res);
|
||||
else if(res==0)
|
||||
res = set_local_var(name, 1);
|
||||
else
|
||||
res = 0;
|
||||
free(name);
|
||||
return res;
|
||||
}
|
||||
|
||||
/* built-in 'fg' and 'bg' handler */
|
||||
@ -605,66 +627,52 @@ static int builtin_jobs(struct child_prog *child)
|
||||
/* built-in 'pwd' handler */
|
||||
static int builtin_pwd(struct child_prog *dummy)
|
||||
{
|
||||
cwd = xgetcwd((char *)cwd);
|
||||
if (!cwd)
|
||||
cwd = unknown;
|
||||
puts(cwd);
|
||||
puts(set_cwd());
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
|
||||
/* built-in 'read VAR' handler */
|
||||
static int builtin_read(struct child_prog *child)
|
||||
{
|
||||
int res = 0, len, newlen;
|
||||
char *s;
|
||||
char string[MAX_READ];
|
||||
int res;
|
||||
|
||||
if (child->argv[1]) {
|
||||
/* argument (VAR) given: put "VAR=" into buffer */
|
||||
strcpy(string, child->argv[1]);
|
||||
len = strlen(string);
|
||||
string[len++] = '=';
|
||||
string[len] = '\0';
|
||||
/* XXX would it be better to go through in_str? */
|
||||
fgets(&string[len], sizeof(string) - len, stdin); /* read string */
|
||||
newlen = strlen(string);
|
||||
if(newlen > len)
|
||||
string[--newlen] = '\0'; /* chomp trailing newline */
|
||||
/*
|
||||
** string should now contain "VAR=<value>"
|
||||
** copy it (putenv() won't do that, so we must make sure
|
||||
** the string resides in a static buffer!)
|
||||
*/
|
||||
res = -1;
|
||||
if((s = strdup(string)))
|
||||
res = putenv(s);
|
||||
if (res)
|
||||
fprintf(stderr, "read: %s\n", strerror(errno));
|
||||
}
|
||||
else
|
||||
fgets(string, sizeof(string), stdin);
|
||||
char string[BUFSIZ];
|
||||
char *var = 0;
|
||||
|
||||
return (res);
|
||||
string[0] = 0; /* for correct work if stdin have "only EOF" */
|
||||
/* read string */
|
||||
fgets(string, sizeof(string), stdin);
|
||||
chomp(string);
|
||||
var = malloc(strlen(child->argv[1])+strlen(string)+2);
|
||||
if(var) {
|
||||
sprintf(var, "%s=%s", child->argv[1], string);
|
||||
res = set_local_var(var, 0);
|
||||
} else
|
||||
res = -1;
|
||||
if (res)
|
||||
fprintf(stderr, "read: %m\n");
|
||||
free(var); /* not move up - saved errno */
|
||||
return res;
|
||||
} else {
|
||||
do res=getchar(); while(res!='\n' && res!=EOF);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
/* built-in 'set VAR=value' handler */
|
||||
static int builtin_set(struct child_prog *child)
|
||||
{
|
||||
int res;
|
||||
char *temp = child->argv[1];
|
||||
struct variables *e;
|
||||
|
||||
if (temp == NULL)
|
||||
for(e = top_vars; e; e=e->next)
|
||||
printf("%s=%s\n", e->name, e->value);
|
||||
else
|
||||
set_local_var(temp, 0);
|
||||
|
||||
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);
|
||||
}
|
||||
|
||||
|
||||
@ -697,7 +705,7 @@ static int builtin_source(struct child_prog *child)
|
||||
/* XXX search through $PATH is missing */
|
||||
input = fopen(child->argv[1], "r");
|
||||
if (!input) {
|
||||
fprintf(stderr, "Couldn't open file '%s'\n", child->argv[1]);
|
||||
error_msg("Couldn't open file '%s'", child->argv[1]);
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
|
||||
@ -732,11 +740,7 @@ static int builtin_umask(struct child_prog *child)
|
||||
/* built-in 'unset VAR' handler */
|
||||
static int builtin_unset(struct child_prog *child)
|
||||
{
|
||||
if (child->argv[1] == NULL) {
|
||||
fprintf(stderr, "unset: parameter required.\n");
|
||||
return EXIT_FAILURE;
|
||||
}
|
||||
unsetenv(child->argv[1]);
|
||||
/* bash returned already true */
|
||||
unset_local_var(child->argv[1]);
|
||||
return EXIT_SUCCESS;
|
||||
}
|
||||
@ -998,8 +1002,7 @@ static int setup_redirects(struct child_prog *prog, int squirrel[])
|
||||
if (openfd < 0) {
|
||||
/* this could get lost if stderr has been redirected, but
|
||||
bash and ash both lose it as well (though zsh doesn't!) */
|
||||
fprintf(stderr,"error opening %s: %s\n", redir->word.gl_pathv[0],
|
||||
strerror(errno));
|
||||
perror_msg("error opening %s", redir->word.gl_pathv[0]);
|
||||
return 1;
|
||||
}
|
||||
} else {
|
||||
@ -1160,10 +1163,9 @@ static void insert_bg_job(struct pipe *pi)
|
||||
/* physically copy the struct job */
|
||||
memcpy(thejob, pi, sizeof(struct pipe));
|
||||
thejob->next = NULL;
|
||||
//thejob->num_progs = 0;
|
||||
thejob->running_progs = thejob->num_progs;
|
||||
thejob->stopped_progs = 0;
|
||||
thejob->text = xmalloc(MAX_LINE);
|
||||
thejob->text = xmalloc(BUFSIZ); /* cmdedit buffer size */
|
||||
|
||||
//if (pi->progs[0] && pi->progs[0].argv && pi->progs[0].argv[0])
|
||||
{
|
||||
@ -1327,7 +1329,7 @@ static int run_pipe_real(struct pipe *pi)
|
||||
if (i!=0 && child->argv[i]==NULL) {
|
||||
/* assignments, but no command: set the local environment */
|
||||
for (i=0; child->argv[i]!=NULL; i++) {
|
||||
set_local_var(child->argv[i]);
|
||||
set_local_var(child->argv[i], 0);
|
||||
}
|
||||
return EXIT_SUCCESS; /* don't worry about errors in set_local_var() yet */
|
||||
}
|
||||
@ -1646,12 +1648,10 @@ static int xglob(o_string *dest, int flags, glob_t *pglob)
|
||||
gr = globhack(dest->data, flags, pglob);
|
||||
debug_printf("globhack returned %d\n",gr);
|
||||
}
|
||||
if (gr == GLOB_NOSPACE) {
|
||||
fprintf(stderr,"out of memory during glob\n");
|
||||
exit(1);
|
||||
}
|
||||
if (gr == GLOB_NOSPACE)
|
||||
error_msg_and_die("out of memory during glob");
|
||||
if (gr != 0) { /* GLOB_ABORTED ? */
|
||||
fprintf(stderr,"glob(3) error %d\n",gr);
|
||||
error_msg("glob(3) error %d",gr);
|
||||
}
|
||||
/* globprint(glob_target); */
|
||||
return gr;
|
||||
@ -1660,129 +1660,113 @@ static int xglob(o_string *dest, int flags, glob_t *pglob)
|
||||
/* This is used to get/check local shell variables */
|
||||
static char *get_local_var(const char *s)
|
||||
{
|
||||
char **p;
|
||||
int len;
|
||||
struct variables *cur;
|
||||
|
||||
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;
|
||||
}
|
||||
}
|
||||
for (cur = top_vars; cur; cur=cur->next)
|
||||
if(strcmp(cur->name, s)==0)
|
||||
return cur->value;
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/* This is used to set local shell variables */
|
||||
static int set_local_var(const char *s)
|
||||
/* This is used to set local shell variables
|
||||
flg_export==0 if only local (not exporting) variable
|
||||
flg_export==1 if "new" exporting environ
|
||||
flg_export>1 if current startup environ (not call putenv()) */
|
||||
static int set_local_var(const char *s, int flg_export)
|
||||
{
|
||||
char **ep;
|
||||
char *tmp,*name, *value;
|
||||
size_t size;
|
||||
size_t namelen;
|
||||
size_t vallen;
|
||||
char *name, *value;
|
||||
int result=0;
|
||||
struct variables *cur;
|
||||
char *newval = 0;
|
||||
|
||||
name=tmp=strdup(s);
|
||||
name=strdup(s);
|
||||
|
||||
/* Assume when we enter this function that we are already in
|
||||
* NAME=VALUE format. So the first order of business is to
|
||||
* split 's' on the '=' into 'name' and 'value' */
|
||||
value = strchr(name, '=');
|
||||
if (!value) {
|
||||
if (value==0 || (newval = strdup(value+1))==0) {
|
||||
result = -1;
|
||||
goto done_already;
|
||||
}
|
||||
*value='\0';
|
||||
++value;
|
||||
} else {
|
||||
*value++ = 0;
|
||||
|
||||
namelen = strlen (name);
|
||||
vallen = strlen (value);
|
||||
|
||||
/* Now see how many local environment entries we have, and check
|
||||
* if we match an existing environment entry (so we can overwrite it) */
|
||||
size = 0;
|
||||
for (ep = __shell_local_env; ep && *ep != NULL; ++ep) {
|
||||
if (!memcmp (*ep, name, namelen) && (*ep)[namelen] == '=')
|
||||
for(cur = top_vars; cur; cur = cur->next)
|
||||
if(strcmp(cur->name, name)==0)
|
||||
break;
|
||||
else
|
||||
++size;
|
||||
}
|
||||
|
||||
if (ep == NULL || *ep == NULL) {
|
||||
static char **last_environ = NULL;
|
||||
char **new_environ = (char **) malloc((size + 2) * sizeof(char *));
|
||||
if (new_environ == NULL) {
|
||||
if(cur) {
|
||||
if(strcmp(cur->value, value)==0) {
|
||||
result = cur->flg_export == flg_export;
|
||||
} else {
|
||||
if(cur->flg_read_only) {
|
||||
result = -1;
|
||||
goto done_already;
|
||||
error_msg("%s: readonly variable", name);
|
||||
} else {
|
||||
free(cur->value);
|
||||
cur->value = newval;
|
||||
newval = 0; /* protect free */
|
||||
}
|
||||
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) {
|
||||
free (new_environ);
|
||||
errno=ENOMEM;
|
||||
result = -1;
|
||||
goto done_already;
|
||||
}
|
||||
memcpy (new_environ[size], name, namelen);
|
||||
new_environ[size][namelen] = '=';
|
||||
memcpy (&new_environ[size][namelen + 1], value, vallen + 1);
|
||||
|
||||
new_environ[size + 1] = NULL;
|
||||
|
||||
if (last_environ != NULL)
|
||||
free ((__ptr_t) last_environ);
|
||||
last_environ = new_environ;
|
||||
__shell_local_env = new_environ;
|
||||
}
|
||||
else {
|
||||
size_t len = strlen (*ep);
|
||||
if (len < namelen + 1 + vallen) {
|
||||
char *new = malloc (namelen + 1 + vallen + 1);
|
||||
if (new == NULL) {
|
||||
} else {
|
||||
cur = malloc(sizeof(struct variables));
|
||||
if(cur==0) {
|
||||
result = -1;
|
||||
goto done_already;
|
||||
} else {
|
||||
cur->name = strdup(name);
|
||||
if(cur->name == 0) {
|
||||
free(cur);
|
||||
result = -1;
|
||||
} else {
|
||||
struct variables *bottom = top_vars;
|
||||
|
||||
cur->value = newval;
|
||||
newval = 0; /* protect free */
|
||||
cur->next = 0;
|
||||
cur->flg_export = flg_export;
|
||||
cur->flg_read_only = 0;
|
||||
while(bottom->next) bottom=bottom->next;
|
||||
bottom->next = cur;
|
||||
}
|
||||
*ep = new;
|
||||
memcpy (*ep, name, namelen);
|
||||
(*ep)[namelen] = '=';
|
||||
}
|
||||
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:
|
||||
if((result==0 && flg_export==1) || (result>0 && cur->flg_export>0)) {
|
||||
*(value-1) = '=';
|
||||
result = putenv(name);
|
||||
} else {
|
||||
free(name);
|
||||
if(result>0) /* equivalent to previous set */
|
||||
result = 0;
|
||||
}
|
||||
free(newval);
|
||||
return result;
|
||||
}
|
||||
|
||||
static void unset_local_var(const char *name)
|
||||
{
|
||||
char **ep, **dp;
|
||||
size_t namelen;
|
||||
struct variables *cur;
|
||||
|
||||
if (!name)
|
||||
if (name) {
|
||||
for (cur = top_vars; cur; cur=cur->next)
|
||||
if(strcmp(cur->name, name)==0)
|
||||
break;
|
||||
if(cur!=0) {
|
||||
struct variables *next = top_vars;
|
||||
if(cur==next)
|
||||
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;
|
||||
else {
|
||||
if(cur->flg_export)
|
||||
unsetenv(cur->name);
|
||||
free(cur->name);
|
||||
free(cur->value);
|
||||
while (next->next != cur)
|
||||
next = next->next;
|
||||
next->next = cur->next;
|
||||
}
|
||||
free(cur);
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -1963,7 +1947,7 @@ static int done_word(o_string *dest, struct p_context *ctx)
|
||||
if (ctx->pending_redirect) {
|
||||
ctx->pending_redirect=NULL;
|
||||
if (glob_target->gl_pathc != 1) {
|
||||
fprintf(stderr, "ambiguous redirect\n");
|
||||
error_msg("ambiguous redirect");
|
||||
return 1;
|
||||
}
|
||||
} else {
|
||||
@ -2049,7 +2033,7 @@ static int redirect_dup_num(struct in_str *input)
|
||||
}
|
||||
if (ok) return d;
|
||||
|
||||
fprintf(stderr, "ambiguous redirect\n");
|
||||
error_msg("ambiguous redirect");
|
||||
return -2;
|
||||
}
|
||||
|
||||
@ -2261,7 +2245,7 @@ static int handle_dollar(o_string *dest, struct p_context *ctx, struct in_str *i
|
||||
case '-':
|
||||
case '_':
|
||||
/* still unhandled, but should be eventually */
|
||||
fprintf(stderr,"unhandled syntax: $%c\n",ch);
|
||||
error_msg("unhandled syntax: $%c",ch);
|
||||
return 1;
|
||||
break;
|
||||
default:
|
||||
@ -2505,16 +2489,14 @@ int shell_main(int argc, char **argv)
|
||||
int opt;
|
||||
FILE *input;
|
||||
struct jobset joblist_end = { NULL, NULL };
|
||||
char **e = environ;
|
||||
|
||||
/* (re?) initialize globals */
|
||||
ifs=NULL;
|
||||
fake_mode=0;
|
||||
interactive=0;
|
||||
close_me_head = NULL;
|
||||
/* initialize globals */
|
||||
if (e) {
|
||||
for (; *e; e++)
|
||||
set_local_var(*e, 2); /* without call putenv() */
|
||||
}
|
||||
job_list = &joblist_end;
|
||||
last_bg_pid=0;
|
||||
PS2 = "> ";
|
||||
__shell_local_env = 0;
|
||||
|
||||
last_return_code=EXIT_SUCCESS;
|
||||
|
||||
@ -2581,9 +2563,13 @@ int shell_main(int argc, char **argv)
|
||||
fake_mode++;
|
||||
break;
|
||||
default:
|
||||
#ifndef BB_VER
|
||||
fprintf(stderr, "Usage: sh [FILE]...\n"
|
||||
" or: sh -c command [args]...\n\n");
|
||||
exit(EXIT_FAILURE);
|
||||
#else
|
||||
show_usage();
|
||||
#endif
|
||||
}
|
||||
}
|
||||
/* A shell is interactive if the `-i' flag was given, or if all of
|
||||
|
||||
Loading…
Reference in New Issue
Block a user