summaryrefslogtreecommitdiff
path: root/shell
diff options
context:
space:
mode:
Diffstat (limited to 'shell')
-rw-r--r--shell/hush.c382
1 files changed, 184 insertions, 198 deletions
diff --git a/shell/hush.c b/shell/hush.c
index 5956818..a1e65b2 100644
--- a/shell/hush.c
+++ b/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, '=');
+ name = strdup(name);
+
+ if(name) {
+ char *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);
+ 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;
}
- /* 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)
+ }
+ }
+ 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!)
- */
+ char string[BUFSIZ];
+ char *var = 0;
+
+ 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((s = strdup(string)))
- res = putenv(s);
if (res)
- fprintf(stderr, "read: %s\n", strerror(errno));
+ 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;
}
- else
- fgets(string, sizeof(string), stdin);
-
- return (res);
}
/* 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;
-
- namelen = strlen (name);
- vallen = strlen (value);
+ } else {
+ *value++ = 0;
- /* 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) {
- result = -1;
- goto done_already;
- }
- 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;
+ 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 (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
generated by cgit v1.1 at 2024-12-26 17:20:52 +0000