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-rw-r--r--hush.c153
1 files changed, 89 insertions, 64 deletions
diff --git a/hush.c b/hush.c
index 722dcf7..2b10098 100644
--- a/hush.c
+++ b/hush.c
@@ -256,10 +256,8 @@ static const char *cwd;
static struct jobset *job_list;
static unsigned int last_bg_pid;
static char *PS1;
-static char PS2[] = "> ";
-
+static char *PS2;
struct variables shell_ver = { "HUSH_VERSION", "0.01", 1, 1, 0 };
-
struct variables *top_vars = &shell_ver;
#define B_CHUNK (100)
@@ -505,29 +503,29 @@ static int builtin_export(struct child_prog *child)
name = strdup(name);
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;
+ 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 does not return an error when trying to export
+ * an undefined variable. Do likewise. */
+ res = 1;
}
- } else {
- /* bash not put error and set error code
- if exporting not defined variable */
- res = 1;
}
- }
}
if (res<0)
perror_msg("export");
@@ -641,7 +639,7 @@ static int builtin_read(struct child_prog *child)
char string[BUFSIZ];
char *var = 0;
- string[0] = 0; /* for correct work if stdin have "only EOF" */
+ string[0] = 0; /* In case stdin has only EOF */
/* read string */
fgets(string, sizeof(string), stdin);
chomp(string);
@@ -650,10 +648,10 @@ static int builtin_read(struct child_prog *child)
sprintf(var, "%s=%s", child->argv[1], string);
res = set_local_var(var, 0);
} else
- res = -1;
+ res = -1;
if (res)
fprintf(stderr, "read: %m\n");
- free(var); /* not move up - saved errno */
+ free(var); /* So not move up to avoid breaking errno */
return res;
} else {
do res=getchar(); while(res!='\n' && res!=EOF);
@@ -1061,6 +1059,9 @@ static int pipe_wait(struct pipe *pi)
}
/* never returns */
+/* XXX no exit() here. If you don't exec, use _exit instead.
+ * The at_exit handlers apparently confuse the calling process,
+ * in particular stdin handling. Not sure why? */
static void pseudo_exec(struct child_prog *child)
{
int i, rcode;
@@ -1076,7 +1077,9 @@ static void pseudo_exec(struct child_prog *child)
/* If a variable is assigned in a forest, and nobody listens,
* was it ever really set?
*/
- if (child->argv[0] == NULL) exit(EXIT_SUCCESS);
+ if (child->argv[0] == NULL) {
+ _exit(EXIT_SUCCESS);
+ }
/*
* Check if the command matches any of the builtins.
@@ -1087,7 +1090,7 @@ static void pseudo_exec(struct child_prog *child)
for (x = bltins; x->cmd; x++) {
if (strcmp(child->argv[0], x->cmd) == 0 ) {
debug_printf("builtin exec %s\n", child->argv[0]);
- exit(x->function(child));
+ _exit(x->function(child));
}
}
@@ -1128,18 +1131,18 @@ static void pseudo_exec(struct child_prog *child)
debug_printf("exec of %s\n",child->argv[0]);
execvp(child->argv[0],child->argv);
perror_msg("couldn't exec: %s",child->argv[0]);
- exit(1);
+ _exit(1);
} else if (child->group) {
debug_printf("runtime nesting to group\n");
interactive=0; /* crucial!!!! */
rcode = run_list_real(child->group);
/* OK to leak memory by not calling run_list_test,
* since this process is about to exit */
- exit(rcode);
+ _exit(rcode);
} else {
/* Can happen. See what bash does with ">foo" by itself. */
debug_printf("trying to pseudo_exec null command\n");
- exit(EXIT_SUCCESS);
+ _exit(EXIT_SUCCESS);
}
}
@@ -1713,23 +1716,29 @@ static int set_local_var(const char *s, int flg_export)
} else {
*value++ = 0;
- for(cur = top_vars; cur; cur = cur->next)
+ for(cur = top_vars; cur; cur = cur->next) {
if(strcmp(cur->name, name)==0)
- break;
+ break;
+ }
if(cur) {
if(strcmp(cur->value, value)==0) {
- result = cur->flg_export == flg_export;
+ if(flg_export>0 && cur->flg_export==0)
+ cur->flg_export=flg_export;
+ else
+ result++;
} else {
if(cur->flg_read_only) {
- result = -1;
+ result = -1;
error_msg("%s: readonly variable", name);
} else {
+ if(flg_export>0 || cur->flg_export>1)
+ cur->flg_export=1;
free(cur->value);
cur->value = newval;
newval = 0; /* protect free */
- }
- }
+ }
+ }
} else {
cur = malloc(sizeof(struct variables));
if(cur==0) {
@@ -1738,10 +1747,9 @@ static int set_local_var(const char *s, int flg_export)
cur->name = strdup(name);
if(cur->name == 0) {
free(cur);
- result = -1;
+ result = -1;
} else {
struct variables *bottom = top_vars;
-
cur->value = newval;
newval = 0; /* protect free */
cur->next = 0;
@@ -1749,16 +1757,16 @@ static int set_local_var(const char *s, int flg_export)
cur->flg_read_only = 0;
while(bottom->next) bottom=bottom->next;
bottom->next = cur;
+ }
}
}
}
- }
- if((result==0 && flg_export==1) || (result>0 && cur->flg_export>0)) {
+ if(result==0 && cur->flg_export==1) {
*(value-1) = '=';
result = putenv(name);
} else {
- free(name);
+ free(name);
if(result>0) /* equivalent to previous set */
result = 0;
}
@@ -1771,14 +1779,16 @@ static void unset_local_var(const char *name)
struct variables *cur;
if (name) {
- for (cur = top_vars; cur; cur=cur->next)
+ 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;
- else {
+ if(cur->flg_read_only) {
+ error_msg("%s: readonly variable", name);
+ return;
+ } else {
if(cur->flg_export)
unsetenv(cur->name);
free(cur->name);
@@ -2103,9 +2113,9 @@ FILE *generate_stream_from_list(struct pipe *head)
#if 0
#define SURROGATE "surrogate response"
write(1,SURROGATE,sizeof(SURROGATE));
- exit(run_list(head));
+ _exit(run_list(head));
#else
- exit(run_list_real(head)); /* leaks memory */
+ _exit(run_list_real(head)); /* leaks memory */
#endif
}
debug_printf("forked child %d\n",pid);
@@ -2531,18 +2541,43 @@ int shell_main(int argc, char **argv)
struct jobset joblist_end = { NULL, NULL };
char **e = environ;
- /* initialize globals */
+ /* FIXME */
+ fprintf(stderr, "sizeof(map)=%d\n", sizeof(map));
+
+
+ /* XXX what should these be while sourcing /etc/profile? */
+ global_argc = argc;
+ global_argv = argv;
+
+ /* (re?) initialize globals. Sometimes shell_main() ends up calling
+ * shell_main(), therefore we cannot rely on the BSS to zero out this
+ * stuff. Reset these to 0 every time. */
+ ifs = NULL;
+ memset(map,0,sizeof(map));
+ fake_mode = 0;
+ interactive = 0;
+ close_me_head = NULL;
+ last_bg_pid = 0;
+
+ /* Initialize some more globals to non-zero values */
+ set_cwd();
+ job_list = &joblist_end;
+#ifdef BB_FEATURE_COMMAND_EDITING
+ cmdedit_set_initial_prompt();
+#else
+ PS1 = NULL;
+#endif
+ PS2 = "> ";
+
+ /* initialize our shell local variables with the values
+ * currently living in the environment */
if (e) {
for (; *e; e++)
set_local_var(*e, 2); /* without call putenv() */
}
- job_list = &joblist_end;
last_return_code=EXIT_SUCCESS;
- /* XXX what should these be while sourcing /etc/profile? */
- global_argc = argc;
- global_argv = argv;
/* If we get started under a job aware app (like bash
* for example), make sure we are now in charge so we
@@ -2563,16 +2598,6 @@ int shell_main(int argc, char **argv)
}
input=stdin;
- /* initialize the cwd -- this is never freed...*/
- cwd = xgetcwd(0);
- if (!cwd)
- cwd = unknown;
-#ifdef BB_FEATURE_COMMAND_EDITING
- cmdedit_set_initial_prompt();
-#else
- PS1 = NULL;
-#endif
-
while ((opt = getopt(argc, argv, "c:xif")) > 0) {
switch (opt) {
case 'c':
generated by cgit v1.1 at 2024-11-09 01:34:05 +0000