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-rw-r--r--shell/hush.c1848
1 files changed, 904 insertions, 944 deletions
diff --git a/shell/hush.c b/shell/hush.c
index 9c0cd7c8e..0e43b63e7 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -1,9 +1,9 @@
/* vi: set sw=4 ts=4: */
/*
- * sh.c -- a prototype Bourne shell grammar parser
- * Intended to follow the original Thompson and Ritchie
- * "small and simple is beautiful" philosophy, which
- * incidentally is a good match to today's BusyBox.
+ * A prototype Bourne shell grammar parser.
+ * Intended to follow the original Thompson and Ritchie
+ * "small and simple is beautiful" philosophy, which
+ * incidentally is a good match to today's BusyBox.
*
* Copyright (C) 2000,2001 Larry Doolittle <larry@doolittle.boa.org>
*
@@ -22,8 +22,8 @@
* Other credits:
* o_addchr() derived from similar w_addchar function in glibc-2.2.
* setup_redirect(), redirect_opt_num(), and big chunks of main()
- * and many builtins derived from contributions by Erik Andersen
- * miscellaneous bugfixes from Matt Kraai.
+ * and many builtins derived from contributions by Erik Andersen.
+ * Miscellaneous bugfixes from Matt Kraai.
*
* There are two big (and related) architecture differences between
* this parser and the lash parser. One is that this version is
@@ -55,19 +55,17 @@
* change { and } from special chars to reserved words
* builtins: return, trap, ulimit
* test magic exec with redirection only
- * check setting of global_argc and global_argv
* follow IFS rules more precisely, including update semantics
* figure out what to do with backslash-newline
* propagate syntax errors, die on resource errors?
* continuation lines, both explicit and implicit - done?
- * memory leak finding and plugging - done?
* maybe change charmap[] to use 2-bit entries
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
#include "busybox.h" /* for APPLET_IS_NOFORK/NOEXEC */
-//TODO: pull in some .h and find out do we have SINGLE_APPLET_MAIN?
+//TODO: pull in some .h and find out whether we have SINGLE_APPLET_MAIN?
//#include "applet_tables.h" doesn't work
#include <glob.h>
/* #include <dmalloc.h> */
@@ -75,7 +73,7 @@
#include <fnmatch.h>
#endif
-#define HUSH_VER_STR "0.91"
+#define HUSH_VER_STR "0.92"
#if defined SINGLE_APPLET_MAIN
/* STANDALONE does not make sense, and won't compile */
@@ -108,6 +106,16 @@
#define ENABLE_FEATURE_EDITING_FANCY_PROMPT 0
#endif
+/* Do we support ANY keywords? */
+#if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
+#define HAS_KEYWORDS 1
+#define IF_HAS_KEYWORDS(...) __VA_ARGS__
+#define IF_HAS_NO_KEYWORDS(...)
+#else
+#define HAS_KEYWORDS 0
+#define IF_HAS_KEYWORDS(...)
+#define IF_HAS_NO_KEYWORDS(...) __VA_ARGS__
+#endif
/* Keep unconditionally on for now */
#define HUSH_DEBUG 1
@@ -237,17 +245,9 @@ void xxfree(void *ptr)
#endif
-/* Do we support ANY keywords? */
-#if ENABLE_HUSH_IF || ENABLE_HUSH_LOOPS || ENABLE_HUSH_CASE
-#define HAS_KEYWORDS 1
-#define IF_HAS_KEYWORDS(...) __VA_ARGS__
-#define IF_HAS_NO_KEYWORDS(...)
-#else
-#define HAS_KEYWORDS 0
-#define IF_HAS_KEYWORDS(...)
-#define IF_HAS_NO_KEYWORDS(...) __VA_ARGS__
-#endif
+static const char hush_version_str[] ALIGN1 = "HUSH_VERSION="HUSH_VER_STR;
+#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
#define SPECIAL_VAR_SYMBOL 3
#define PARSEFLAG_EXIT_FROM_LOOP 1
@@ -324,7 +324,7 @@ struct command {
pid_t pid; /* 0 if exited */
int assignment_cnt; /* how many argv[i] are assignments? */
smallint is_stopped; /* is the command currently running? */
- smallint grp_type;
+ smallint grp_type; /* GRP_xxx */
struct pipe *group; /* if non-NULL, this "prog" is {} group,
* subshell, or a compound statement */
char **argv; /* command name and arguments */
@@ -442,7 +442,6 @@ enum {
/* "Globals" within this file */
-
/* Sorted roughly by size (smaller offsets == smaller code) */
struct globals {
#if ENABLE_HUSH_INTERACTIVE
@@ -503,7 +502,93 @@ struct globals {
} while (0)
-#define JOB_STATUS_FORMAT "[%d] %-22s %.40s\n"
+/* Function prototypes for builtins */
+static int builtin_cd(char **argv);
+static int builtin_echo(char **argv);
+static int builtin_eval(char **argv);
+static int builtin_exec(char **argv);
+static int builtin_exit(char **argv);
+static int builtin_export(char **argv);
+#if ENABLE_HUSH_JOB
+static int builtin_fg_bg(char **argv);
+static int builtin_jobs(char **argv);
+#endif
+#if ENABLE_HUSH_HELP
+static int builtin_help(char **argv);
+#endif
+static int builtin_pwd(char **argv);
+static int builtin_read(char **argv);
+static int builtin_test(char **argv);
+static int builtin_true(char **argv);
+static int builtin_set(char **argv);
+static int builtin_shift(char **argv);
+static int builtin_source(char **argv);
+static int builtin_umask(char **argv);
+static int builtin_unset(char **argv);
+#if ENABLE_HUSH_LOOPS
+static int builtin_break(char **argv);
+static int builtin_continue(char **argv);
+#endif
+//static int builtin_not_written(char **argv);
+
+/* Table of built-in functions. They can be forked or not, depending on
+ * context: within pipes, they fork. As simple commands, they do not.
+ * When used in non-forking context, they can change global variables
+ * in the parent shell process. If forked, of course they cannot.
+ * For example, 'unset foo | whatever' will parse and run, but foo will
+ * still be set at the end. */
+struct built_in_command {
+ const char *cmd;
+ int (*function)(char **argv);
+#if ENABLE_HUSH_HELP
+ const char *descr;
+#define BLTIN(cmd, func, help) { cmd, func, help }
+#else
+#define BLTIN(cmd, func, help) { cmd, func }
+#endif
+};
+
+/* For now, echo and test are unconditionally enabled.
+ * Maybe make it configurable? */
+static const struct built_in_command bltins[] = {
+ BLTIN("." , builtin_source, "Run commands in a file"),
+ BLTIN(":" , builtin_true, "No-op"),
+ BLTIN("[" , builtin_test, "Test condition"),
+ BLTIN("[[" , builtin_test, "Test condition"),
+#if ENABLE_HUSH_JOB
+ BLTIN("bg" , builtin_fg_bg, "Resume a job in the background"),
+#endif
+#if ENABLE_HUSH_LOOPS
+ BLTIN("break" , builtin_break, "Exit from a loop"),
+#endif
+ BLTIN("cd" , builtin_cd, "Change directory"),
+#if ENABLE_HUSH_LOOPS
+ BLTIN("continue", builtin_continue, "Start new loop iteration"),
+#endif
+ BLTIN("echo" , builtin_echo, "Write to stdout"),
+ BLTIN("eval" , builtin_eval, "Construct and run shell command"),
+ BLTIN("exec" , builtin_exec, "Execute command, don't return to shell"),
+ BLTIN("exit" , builtin_exit, "Exit"),
+ BLTIN("export", builtin_export, "Set environment variable"),
+#if ENABLE_HUSH_JOB
+ BLTIN("fg" , builtin_fg_bg, "Bring job into the foreground"),
+ BLTIN("jobs" , builtin_jobs, "List active jobs"),
+#endif
+ BLTIN("pwd" , builtin_pwd, "Print current directory"),
+ BLTIN("read" , builtin_read, "Input environment variable"),
+// BLTIN("return", builtin_not_written, "Return from a function"),
+ BLTIN("set" , builtin_set, "Set/unset shell local variables"),
+ BLTIN("shift" , builtin_shift, "Shift positional parameters"),
+// BLTIN("trap" , builtin_not_written, "Trap signals"),
+ BLTIN("test" , builtin_test, "Test condition"),
+// BLTIN("ulimit", builtin_not_written, "Control resource limits"),
+ BLTIN("umask" , builtin_umask, "Set file creation mask"),
+ BLTIN("unset" , builtin_unset, "Unset environment variable"),
+#if ENABLE_HUSH_HELP
+ BLTIN("help" , builtin_help, "List shell built-in commands"),
+#endif
+};
+
#if 1
/* Normal */
@@ -520,7 +605,6 @@ static void syntax(const char *msg)
bb_error_msg_and_die(msg ? "%s: %s" : "syntax error", "syntax error", msg);
#endif
}
-
#else
/* Debug */
static void syntax_lineno(int line)
@@ -536,84 +620,6 @@ static void syntax_lineno(int line)
#define syntax(str) syntax_lineno(__LINE__)
#endif
-/* Index of subroutines: */
-/* in_str manipulations: */
-static int static_get(struct in_str *i);
-static int static_peek(struct in_str *i);
-static int file_get(struct in_str *i);
-static int file_peek(struct in_str *i);
-static void setup_file_in_str(struct in_str *i, FILE *f);
-static void setup_string_in_str(struct in_str *i, const char *s);
-/* "run" the final data structures: */
-#if !defined(DEBUG_CLEAN)
-#define free_pipe_list(head, indent) free_pipe_list(head)
-#define free_pipe(pi, indent) free_pipe(pi)
-#endif
-static int free_pipe_list(struct pipe *head, int indent);
-static int free_pipe(struct pipe *pi, int indent);
-/* really run the final data structures: */
-typedef struct nommu_save_t {
- char **new_env;
- char **old_env;
- char **argv;
-} nommu_save_t;
-#if BB_MMU
-#define pseudo_exec_argv(nommu_save, argv, assignment_cnt, argv_expanded) \
- pseudo_exec_argv(argv, assignment_cnt, argv_expanded)
-#define pseudo_exec(nommu_save, command, argv_expanded) \
- pseudo_exec(command, argv_expanded)
-#endif
-static void pseudo_exec_argv(nommu_save_t *nommu_save, char **argv, int assignment_cnt, char **argv_expanded) NORETURN;
-static void pseudo_exec(nommu_save_t *nommu_save, struct command *command, char **argv_expanded) NORETURN;
-static int setup_redirects(struct command *prog, int squirrel[]);
-static int run_list(struct pipe *pi);
-static int run_pipe(struct pipe *pi);
-/* data structure manipulation: */
-static int setup_redirect(struct parse_context *ctx, int fd, redir_type style, struct in_str *input);
-static void initialize_context(struct parse_context *ctx);
-static int done_word(o_string *dest, struct parse_context *ctx);
-static int done_command(struct parse_context *ctx);
-static void done_pipe(struct parse_context *ctx, pipe_style type);
-/* primary string parsing: */
-static int redirect_dup_num(struct in_str *input);
-static int redirect_opt_num(o_string *o);
-#if ENABLE_HUSH_TICK
-static int process_command_subs(o_string *dest,
- struct in_str *input, const char *subst_end);
-#endif
-static int parse_group(o_string *dest, struct parse_context *ctx, struct in_str *input, int ch);
-static const char *lookup_param(const char *src);
-static int handle_dollar(o_string *dest,
- struct in_str *input);
-static int parse_stream(o_string *dest, struct parse_context *ctx, struct in_str *input0, const char *end_trigger);
-/* setup: */
-static int parse_and_run_stream(struct in_str *inp, int parse_flag);
-static int parse_and_run_string(const char *s, int parse_flag);
-static int parse_and_run_file(FILE *f);
-/* job management: */
-static int checkjobs(struct pipe* fg_pipe);
-#if ENABLE_HUSH_JOB
-static int checkjobs_and_fg_shell(struct pipe* fg_pipe);
-static void insert_bg_job(struct pipe *pi);
-static void remove_bg_job(struct pipe *pi);
-static void delete_finished_bg_job(struct pipe *pi);
-#else
-int checkjobs_and_fg_shell(struct pipe* fg_pipe); /* never called */
-#endif
-/* local variable support */
-static char **expand_strvec_to_strvec(char **argv);
-/* used for eval */
-static char *expand_strvec_to_string(char **argv);
-/* used for expansion of right hand of assignments */
-static char *expand_string_to_string(const char *str);
-static struct variable *get_local_var(const char *name);
-static int set_local_var(char *str, int flg_export);
-static void unset_local_var(const char *name);
-
-
-static const char hush_version_str[] ALIGN1 = "HUSH_VERSION="HUSH_VER_STR;
-
-
static int glob_needed(const char *s)
{
while (*s) {
@@ -747,94 +753,6 @@ static void free_strings(char **strings)
}
-/* Function prototypes for builtins */
-static int builtin_cd(char **argv);
-static int builtin_echo(char **argv);
-static int builtin_eval(char **argv);
-static int builtin_exec(char **argv);
-static int builtin_exit(char **argv);
-static int builtin_export(char **argv);
-#if ENABLE_HUSH_JOB
-static int builtin_fg_bg(char **argv);
-static int builtin_jobs(char **argv);
-#endif
-#if ENABLE_HUSH_HELP
-static int builtin_help(char **argv);
-#endif
-static int builtin_pwd(char **argv);
-static int builtin_read(char **argv);
-static int builtin_test(char **argv);
-static int builtin_true(char **argv);
-static int builtin_set(char **argv);
-static int builtin_shift(char **argv);
-static int builtin_source(char **argv);
-static int builtin_umask(char **argv);
-static int builtin_unset(char **argv);
-#if ENABLE_HUSH_LOOPS
-static int builtin_break(char **argv);
-static int builtin_continue(char **argv);
-#endif
-//static int builtin_not_written(char **argv);
-
-/* Table of built-in functions. They can be forked or not, depending on
- * context: within pipes, they fork. As simple commands, they do not.
- * When used in non-forking context, they can change global variables
- * in the parent shell process. If forked, of course they cannot.
- * For example, 'unset foo | whatever' will parse and run, but foo will
- * still be set at the end. */
-struct built_in_command {
- const char *cmd;
- int (*function)(char **argv);
-#if ENABLE_HUSH_HELP
- const char *descr;
-#define BLTIN(cmd, func, help) { cmd, func, help }
-#else
-#define BLTIN(cmd, func, help) { cmd, func }
-#endif
-};
-
-/* For now, echo and test are unconditionally enabled.
- * Maybe make it configurable? */
-static const struct built_in_command bltins[] = {
- BLTIN("." , builtin_source, "Run commands in a file"),
- BLTIN(":" , builtin_true, "No-op"),
- BLTIN("[" , builtin_test, "Test condition"),
- BLTIN("[[" , builtin_test, "Test condition"),
-#if ENABLE_HUSH_JOB
- BLTIN("bg" , builtin_fg_bg, "Resume a job in the background"),
-#endif
-#if ENABLE_HUSH_LOOPS
- BLTIN("break" , builtin_break, "Exit from a loop"),
-#endif
- BLTIN("cd" , builtin_cd, "Change directory"),
-#if ENABLE_HUSH_LOOPS
- BLTIN("continue", builtin_continue, "Start new loop iteration"),
-#endif
- BLTIN("echo" , builtin_echo, "Write to stdout"),
- BLTIN("eval" , builtin_eval, "Construct and run shell command"),
- BLTIN("exec" , builtin_exec, "Execute command, don't return to shell"),
- BLTIN("exit" , builtin_exit, "Exit"),
- BLTIN("export", builtin_export, "Set environment variable"),
-#if ENABLE_HUSH_JOB
- BLTIN("fg" , builtin_fg_bg, "Bring job into the foreground"),
- BLTIN("jobs" , builtin_jobs, "List active jobs"),
-#endif
- BLTIN("pwd" , builtin_pwd, "Print current directory"),
- BLTIN("read" , builtin_read, "Input environment variable"),
-// BLTIN("return", builtin_not_written, "Return from a function"),
- BLTIN("set" , builtin_set, "Set/unset shell local variables"),
- BLTIN("shift" , builtin_shift, "Shift positional parameters"),
-// BLTIN("trap" , builtin_not_written, "Trap signals"),
- BLTIN("test" , builtin_test, "Test condition"),
-// BLTIN("ulimit", builtin_not_written, "Control resource limits"),
- BLTIN("umask" , builtin_umask, "Set file creation mask"),
- BLTIN("unset" , builtin_unset, "Unset environment variable"),
-#if ENABLE_HUSH_HELP
- BLTIN("help" , builtin_help, "List shell built-in commands"),
-#endif
-};
-
-
/* Signals are grouped, we handle them in batches */
static void set_misc_sighandler(void (*handler)(int))
{
@@ -961,8 +879,10 @@ static void hush_exit(int exitcode)
static const char *set_cwd(void)
{
+ /* xrealloc_getcwd_or_warn(arg) calls free(arg),
+ * we must not try to free(bb_msg_unknown) */
if (G.cwd == bb_msg_unknown)
- G.cwd = NULL; /* xrealloc_getcwd_or_warn(arg) calls free(arg)! */
+ G.cwd = NULL;
G.cwd = xrealloc_getcwd_or_warn((char *)G.cwd);
if (!G.cwd)
G.cwd = bb_msg_unknown;
@@ -970,6 +890,295 @@ static const char *set_cwd(void)
}
+/* Get/check local shell variables */
+static struct variable *get_local_var(const char *name)
+{
+ struct variable *cur;
+ int len;
+
+ if (!name)
+ return NULL;
+ len = strlen(name);
+ for (cur = G.top_var; cur; cur = cur->next) {
+ if (strncmp(cur->varstr, name, len) == 0 && cur->varstr[len] == '=')
+ return cur;
+ }
+ return NULL;
+}
+
+/* Basically useful version until someone wants to get fancier,
+ * see the bash man page under "Parameter Expansion" */
+static const char *lookup_param(const char *src)
+{
+ struct variable *var = get_local_var(src);
+ if (var)
+ return strchr(var->varstr, '=') + 1;
+ return NULL;
+}
+
+/* str holds "NAME=VAL" and is expected to be malloced.
+ * We take ownership of it. */
+static int set_local_var(char *str, int flg_export)
+{
+ struct variable *cur;
+ char *value;
+ int name_len;
+
+ value = strchr(str, '=');
+ if (!value) { /* not expected to ever happen? */
+ free(str);
+ return -1;
+ }
+
+ name_len = value - str + 1; /* including '=' */
+ cur = G.top_var; /* cannot be NULL (we have HUSH_VERSION and it's RO) */
+ while (1) {
+ if (strncmp(cur->varstr, str, name_len) != 0) {
+ if (!cur->next) {
+ /* Bail out. Note that now cur points
+ * to last var in linked list */
+ break;
+ }
+ cur = cur->next;
+ continue;
+ }
+ /* We found an existing var with this name */
+ *value = '\0';
+ if (cur->flg_read_only) {
+ bb_error_msg("%s: readonly variable", str);
+ free(str);
+ return -1;
+ }
+ debug_printf_env("%s: unsetenv '%s'\n", __func__, str);
+ unsetenv(str); /* just in case */
+ *value = '=';
+ if (strcmp(cur->varstr, str) == 0) {
+ free_and_exp:
+ free(str);
+ goto exp;
+ }
+ if (cur->max_len >= strlen(str)) {
+ /* This one is from startup env, reuse space */
+ strcpy(cur->varstr, str);
+ goto free_and_exp;
+ }
+ /* max_len == 0 signifies "malloced" var, which we can
+ * (and has to) free */
+ if (!cur->max_len)
+ free(cur->varstr);
+ cur->max_len = 0;
+ goto set_str_and_exp;
+ }
+
+ /* Not found - create next variable struct */
+ cur->next = xzalloc(sizeof(*cur));
+ cur = cur->next;
+
+ set_str_and_exp:
+ cur->varstr = str;
+ exp:
+ if (flg_export)
+ cur->flg_export = 1;
+ if (cur->flg_export) {
+ debug_printf_env("%s: putenv '%s'\n", __func__, cur->varstr);
+ return putenv(cur->varstr);
+ }
+ return 0;
+}
+
+static void unset_local_var(const char *name)
+{
+ struct variable *cur;
+ struct variable *prev = prev; /* for gcc */
+ int name_len;
+
+ if (!name)
+ return;
+ name_len = strlen(name);
+ cur = G.top_var;
+ while (cur) {
+ if (strncmp(cur->varstr, name, name_len) == 0 && cur->varstr[name_len] == '=') {
+ if (cur->flg_read_only) {
+ bb_error_msg("%s: readonly variable", name);
+ return;
+ }
+ /* prev is ok to use here because 1st variable, HUSH_VERSION,
+ * is ro, and we cannot reach this code on the 1st pass */
+ prev->next = cur->next;
+ debug_printf_env("%s: unsetenv '%s'\n", __func__, cur->varstr);
+ bb_unsetenv(cur->varstr);
+ if (!cur->max_len)
+ free(cur->varstr);
+ free(cur);
+ return;
+ }
+ prev = cur;
+ cur = cur->next;
+ }
+}
+
+
+/*
+ * in_str support
+ */
+static int static_get(struct in_str *i)
+{
+ int ch = *i->p++;
+ if (ch == '\0') return EOF;
+ return ch;
+}
+
+static int static_peek(struct in_str *i)
+{
+ return *i->p;
+}
+
+#if ENABLE_HUSH_INTERACTIVE
+
+#if ENABLE_FEATURE_EDITING
+static void cmdedit_set_initial_prompt(void)
+{
+#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
+ G.PS1 = NULL;
+#else
+ G.PS1 = getenv("PS1");
+ if (G.PS1 == NULL)
+ G.PS1 = "\\w \\$ ";
+#endif
+}
+#endif /* EDITING */
+
+static const char* setup_prompt_string(int promptmode)
+{
+ const char *prompt_str;
+ debug_printf("setup_prompt_string %d ", promptmode);
+#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
+ /* Set up the prompt */
+ if (promptmode == 0) { /* PS1 */
+ free((char*)G.PS1);
+ G.PS1 = xasprintf("%s %c ", G.cwd, (geteuid() != 0) ? '$' : '#');
+ prompt_str = G.PS1;
+ } else {
+ prompt_str = G.PS2;
+ }
+#else
+ prompt_str = (promptmode == 0) ? G.PS1 : G.PS2;
+#endif
+ debug_printf("result '%s'\n", prompt_str);
+ return prompt_str;
+}
+
+static void get_user_input(struct in_str *i)
+{
+ int r;
+ const char *prompt_str;
+
+ prompt_str = setup_prompt_string(i->promptmode);
+#if ENABLE_FEATURE_EDITING
+ /* Enable command line editing only while a command line
+ * is actually being read */
+ do {
+ r = read_line_input(prompt_str, G.user_input_buf, BUFSIZ-1, G.line_input_state);
+ } while (r == 0); /* repeat if Ctrl-C */
+ i->eof_flag = (r < 0);
+ if (i->eof_flag) { /* EOF/error detected */
+ G.user_input_buf[0] = EOF; /* yes, it will be truncated, it's ok */
+ G.user_input_buf[1] = '\0';
+ }
+#else
+ fputs(prompt_str, stdout);
+ fflush(stdout);
+ G.user_input_buf[0] = r = fgetc(i->file);
+ /*G.user_input_buf[1] = '\0'; - already is and never changed */
+ i->eof_flag = (r == EOF);
+#endif
+ i->p = G.user_input_buf;
+}
+
+#endif /* INTERACTIVE */
+
+/* This is the magic location that prints prompts
+ * and gets data back from the user */
+static int file_get(struct in_str *i)
+{
+ int ch;
+
+ /* If there is data waiting, eat it up */
+ if (i->p && *i->p) {
+#if ENABLE_HUSH_INTERACTIVE
+ take_cached:
+#endif
+ ch = *i->p++;
+ if (i->eof_flag && !*i->p)
+ ch = EOF;
+ } else {
+ /* need to double check i->file because we might be doing something
+ * more complicated by now, like sourcing or substituting. */
+#if ENABLE_HUSH_INTERACTIVE
+ if (G.interactive_fd && i->promptme && i->file == stdin) {
+ do {
+ get_user_input(i);
+ } while (!*i->p); /* need non-empty line */
+ i->promptmode = 1; /* PS2 */
+ i->promptme = 0;
+ goto take_cached;
+ }
+#endif
+ ch = fgetc(i->file);
+ }
+ debug_printf("file_get: got a '%c' %d\n", ch, ch);
+#if ENABLE_HUSH_INTERACTIVE
+ if (ch == '\n')
+ i->promptme = 1;
+#endif
+ return ch;
+}
+
+/* All the callers guarantee this routine will never be
+ * used right after a newline, so prompting is not needed.
+ */
+static int file_peek(struct in_str *i)
+{
+ int ch;
+ if (i->p && *i->p) {
+ if (i->eof_flag && !i->p[1])
+ return EOF;
+ return *i->p;
+ }
+ ch = fgetc(i->file);
+ i->eof_flag = (ch == EOF);
+ i->peek_buf[0] = ch;
+ i->peek_buf[1] = '\0';
+ i->p = i->peek_buf;
+ debug_printf("file_peek: got a '%c' %d\n", *i->p, *i->p);
+ return ch;
+}
+
+static void setup_file_in_str(struct in_str *i, FILE *f)
+{
+ i->peek = file_peek;
+ i->get = file_get;
+#if ENABLE_HUSH_INTERACTIVE
+ i->promptme = 1;
+ i->promptmode = 0; /* PS1 */
+#endif
+ i->file = f;
+ i->p = NULL;
+}
+
+static void setup_string_in_str(struct in_str *i, const char *s)
+{
+ i->peek = static_peek;
+ i->get = static_get;
+#if ENABLE_HUSH_INTERACTIVE
+ i->promptme = 1;
+ i->promptmode = 0; /* PS1 */
+#endif
+ i->p = s;
+ i->eof_flag = 0;
+}
+
+
/*
* o_string support
*/
@@ -1252,164 +1461,300 @@ static char **o_finalize_list(o_string *o, int n)
}
-/*
- * in_str support
- */
-static int static_get(struct in_str *i)
-{
- int ch = *i->p++;
- if (ch == '\0') return EOF;
- return ch;
-}
+/* expand_strvec_to_strvec() takes a list of strings, expands
+ * all variable references within and returns a pointer to
+ * a list of expanded strings, possibly with larger number
+ * of strings. (Think VAR="a b"; echo $VAR).
+ * This new list is allocated as a single malloc block.
+ * NULL-terminated list of char* pointers is at the beginning of it,
+ * followed by strings themself.
+ * Caller can deallocate entire list by single free(list). */
-static int static_peek(struct in_str *i)
+/* Store given string, finalizing the word and starting new one whenever
+ * we encounter IFS char(s). This is used for expanding variable values.
+ * End-of-string does NOT finalize word: think about 'echo -$VAR-' */
+static int expand_on_ifs(o_string *output, int n, const char *str)
{
- return *i->p;
+ while (1) {
+ int word_len = strcspn(str, G.ifs);
+ if (word_len) {
+ if (output->o_quote || !output->o_glob)
+ o_addQstr(output, str, word_len);
+ else /* protect backslashes against globbing up :) */
+ o_addstr_duplicate_backslash(output, str, word_len);
+ str += word_len;
+ }
+ if (!*str) /* EOL - do not finalize word */
+ break;
+ o_addchr(output, '\0');
+ debug_print_list("expand_on_ifs", output, n);
+ n = o_save_ptr(output, n);
+ str += strspn(str, G.ifs); /* skip ifs chars */
+ }
+ debug_print_list("expand_on_ifs[1]", output, n);
+ return n;
}
-#if ENABLE_HUSH_INTERACTIVE
+#if ENABLE_HUSH_TICK
+static int process_command_subs(o_string *dest,
+ struct in_str *input, const char *subst_end);
+#endif
-#if ENABLE_FEATURE_EDITING
-static void cmdedit_set_initial_prompt(void)
+/* Expand all variable references in given string, adding words to list[]
+ * at n, n+1,... positions. Return updated n (so that list[n] is next one
+ * to be filled). This routine is extremely tricky: has to deal with
+ * variables/parameters with whitespace, $* and $@, and constructs like
+ * 'echo -$*-'. If you play here, you must run testsuite afterwards! */
+static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
{
-#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
- G.PS1 = NULL;
-#else
- G.PS1 = getenv("PS1");
- if (G.PS1 == NULL)
- G.PS1 = "\\w \\$ ";
+ /* or_mask is either 0 (normal case) or 0x80
+ * (expansion of right-hand side of assignment == 1-element expand.
+ * It will also do no globbing, and thus we must not backslash-quote!) */
+
+ char first_ch, ored_ch;
+ int i;
+ const char *val;
+ char *p;
+
+ ored_ch = 0;
+
+ debug_printf_expand("expand_vars_to_list: arg '%s'\n", arg);
+ debug_print_list("expand_vars_to_list", output, n);
+ n = o_save_ptr(output, n);
+ debug_print_list("expand_vars_to_list[0]", output, n);
+
+ while ((p = strchr(arg, SPECIAL_VAR_SYMBOL)) != NULL) {
+#if ENABLE_HUSH_TICK
+ o_string subst_result = NULL_O_STRING;
#endif
-}
-#endif /* EDITING */
+ o_addstr(output, arg, p - arg);
+ debug_print_list("expand_vars_to_list[1]", output, n);
+ arg = ++p;
+ p = strchr(p, SPECIAL_VAR_SYMBOL);
-static const char* setup_prompt_string(int promptmode)
-{
- const char *prompt_str;
- debug_printf("setup_prompt_string %d ", promptmode);
-#if !ENABLE_FEATURE_EDITING_FANCY_PROMPT
- /* Set up the prompt */
- if (promptmode == 0) { /* PS1 */
- free((char*)G.PS1);
- G.PS1 = xasprintf("%s %c ", G.cwd, (geteuid() != 0) ? '$' : '#');
- prompt_str = G.PS1;
+ first_ch = arg[0] | or_mask; /* forced to "quoted" if or_mask = 0x80 */
+ /* "$@" is special. Even if quoted, it can still
+ * expand to nothing (not even an empty string) */
+ if ((first_ch & 0x7f) != '@')
+ ored_ch |= first_ch;
+ val = NULL;
+ switch (first_ch & 0x7f) {
+ /* Highest bit in first_ch indicates that var is double-quoted */
+ case '$': /* pid */
+ val = utoa(G.root_pid);
+ break;
+ case '!': /* bg pid */
+ val = G.last_bg_pid ? utoa(G.last_bg_pid) : (char*)"";
+ break;
+ case '?': /* exitcode */
+ val = utoa(G.last_return_code);
+ break;
+ case '#': /* argc */
+ val = utoa(G.global_argc ? G.global_argc-1 : 0);
+ break;
+ case '*':
+ case '@':
+ i = 1;
+ if (!G.global_argv[i])
+ break;
+ ored_ch |= first_ch; /* do it for "$@" _now_, when we know it's not empty */
+ if (!(first_ch & 0x80)) { /* unquoted $* or $@ */
+ smallint sv = output->o_quote;
+ /* unquoted var's contents should be globbed, so don't quote */
+ output->o_quote = 0;
+ while (G.global_argv[i]) {
+ n = expand_on_ifs(output, n, G.global_argv[i]);
+ debug_printf_expand("expand_vars_to_list: argv %d (last %d)\n", i, G.global_argc - 1);
+ if (G.global_argv[i++][0] && G.global_argv[i]) {
+ /* this argv[] is not empty and not last:
+ * put terminating NUL, start new word */
+ o_addchr(output, '\0');
+ debug_print_list("expand_vars_to_list[2]", output, n);
+ n = o_save_ptr(output, n);
+ debug_print_list("expand_vars_to_list[3]", output, n);
+ }
+ }
+ output->o_quote = sv;
+ } else
+ /* If or_mask is nonzero, we handle assignment 'a=....$@.....'
+ * and in this case should treat it like '$*' - see 'else...' below */
+ if (first_ch == ('@'|0x80) && !or_mask) { /* quoted $@ */
+ while (1) {
+ o_addQstr(output, G.global_argv[i], strlen(G.global_argv[i]));
+ if (++i >= G.global_argc)
+ break;
+ o_addchr(output, '\0');
+ debug_print_list("expand_vars_to_list[4]", output, n);
+ n = o_save_ptr(output, n);
+ }
+ } else { /* quoted $*: add as one word */
+ while (1) {
+ o_addQstr(output, G.global_argv[i], strlen(G.global_argv[i]));
+ if (!G.global_argv[++i])
+ break;
+ if (G.ifs[0])
+ o_addchr(output, G.ifs[0]);
+ }
+ }
+ break;
+ case SPECIAL_VAR_SYMBOL: /* <SPECIAL_VAR_SYMBOL><SPECIAL_VAR_SYMBOL> */
+ /* "Empty variable", used to make "" etc to not disappear */
+ arg++;
+ ored_ch = 0x80;
+ break;
+#if ENABLE_HUSH_TICK
+ case '`': { /* <SPECIAL_VAR_SYMBOL>`cmd<SPECIAL_VAR_SYMBOL> */
+ struct in_str input;
+ *p = '\0';
+ arg++;
+//TODO: can we just stuff it into "output" directly?
+ debug_printf_subst("SUBST '%s' first_ch %x\n", arg, first_ch);
+ setup_string_in_str(&input, arg);
+ process_command_subs(&subst_result, &input, NULL);
+ debug_printf_subst("SUBST RES '%s'\n", subst_result.data);
+ val = subst_result.data;
+ goto store_val;
+ }
+#endif
+ default: /* <SPECIAL_VAR_SYMBOL>varname<SPECIAL_VAR_SYMBOL> */
+ *p = '\0';
+ arg[0] = first_ch & 0x7f;
+ if (isdigit(arg[0])) {
+ i = xatoi_u(arg);
+ if (i < G.global_argc)
+ val = G.global_argv[i];
+ /* else val remains NULL: $N with too big N */
+ } else
+ val = lookup_param(arg);
+ arg[0] = first_ch;
+#if ENABLE_HUSH_TICK
+ store_val:
+#endif
+ *p = SPECIAL_VAR_SYMBOL;
+ if (!(first_ch & 0x80)) { /* unquoted $VAR */
+ debug_printf_expand("unquoted '%s', output->o_quote:%d\n", val, output->o_quote);
+ if (val) {
+ /* unquoted var's contents should be globbed, so don't quote */
+ smallint sv = output->o_quote;
+ output->o_quote = 0;
+ n = expand_on_ifs(output, n, val);
+ val = NULL;
+ output->o_quote = sv;
+ }
+ } else { /* quoted $VAR, val will be appended below */
+ debug_printf_expand("quoted '%s', output->o_quote:%d\n", val, output->o_quote);
+ }
+ }
+ if (val) {
+ o_addQstr(output, val, strlen(val));
+ }
+
+#if ENABLE_HUSH_TICK
+ o_free(&subst_result);
+#endif
+ arg = ++p;
+ } /* end of "while (SPECIAL_VAR_SYMBOL is found) ..." */
+
+ if (arg[0]) {
+ debug_print_list("expand_vars_to_list[a]", output, n);
+ /* this part is literal, and it was already pre-quoted
+ * if needed (much earlier), do not use o_addQstr here! */
+ o_addstr(output, arg, strlen(arg) + 1);
+ debug_print_list("expand_vars_to_list[b]", output, n);
+ } else if (output->length == o_get_last_ptr(output, n) /* expansion is empty */
+ && !(ored_ch & 0x80) /* and all vars were not quoted. */
+ ) {
+ n--;
+ /* allow to reuse list[n] later without re-growth */
+ output->has_empty_slot = 1;
} else {
- prompt_str = G.PS2;
+ o_addchr(output, '\0');
}
-#else
- prompt_str = (promptmode == 0) ? G.PS1 : G.PS2;
-#endif
- debug_printf("result '%s'\n", prompt_str);
- return prompt_str;
+ return n;
}
-static void get_user_input(struct in_str *i)
+static char **expand_variables(char **argv, int or_mask)
{
- int r;
- const char *prompt_str;
+ int n;
+ char **list;
+ char **v;
+ o_string output = NULL_O_STRING;
- prompt_str = setup_prompt_string(i->promptmode);
-#if ENABLE_FEATURE_EDITING
- /* Enable command line editing only while a command line
- * is actually being read */
- do {
- r = read_line_input(prompt_str, G.user_input_buf, BUFSIZ-1, G.line_input_state);
- } while (r == 0); /* repeat if Ctrl-C */
- i->eof_flag = (r < 0);
- if (i->eof_flag) { /* EOF/error detected */
- G.user_input_buf[0] = EOF; /* yes, it will be truncated, it's ok */
- G.user_input_buf[1] = '\0';
+ if (or_mask & 0x100) {
+ output.o_quote = 1; /* protect against globbing for "$var" */
+ /* (unquoted $var will temporarily switch it off) */
+ output.o_glob = 1;
}
-#else
- fputs(prompt_str, stdout);
- fflush(stdout);
- G.user_input_buf[0] = r = fgetc(i->file);
- /*G.user_input_buf[1] = '\0'; - already is and never changed */
- i->eof_flag = (r == EOF);
-#endif
- i->p = G.user_input_buf;
-}
-#endif /* INTERACTIVE */
+ n = 0;
+ v = argv;
+ while (*v) {
+ n = expand_vars_to_list(&output, n, *v, (char)or_mask);
+ v++;
+ }
+ debug_print_list("expand_variables", &output, n);
-/* This is the magic location that prints prompts
- * and gets data back from the user */
-static int file_get(struct in_str *i)
-{
- int ch;
+ /* output.data (malloced in one block) gets returned in "list" */
+ list = o_finalize_list(&output, n);
+ debug_print_strings("expand_variables[1]", list);
+ return list;
+}
- /* If there is data waiting, eat it up */
- if (i->p && *i->p) {
-#if ENABLE_HUSH_INTERACTIVE
- take_cached:
-#endif
- ch = *i->p++;
- if (i->eof_flag && !*i->p)
- ch = EOF;
- } else {
- /* need to double check i->file because we might be doing something
- * more complicated by now, like sourcing or substituting. */
-#if ENABLE_HUSH_INTERACTIVE
- if (G.interactive_fd && i->promptme && i->file == stdin) {
- do {
- get_user_input(i);
- } while (!*i->p); /* need non-empty line */
- i->promptmode = 1; /* PS2 */
- i->promptme = 0;
- goto take_cached;
- }
-#endif
- ch = fgetc(i->file);
- }
- debug_printf("file_get: got a '%c' %d\n", ch, ch);
-#if ENABLE_HUSH_INTERACTIVE
- if (ch == '\n')
- i->promptme = 1;
-#endif
- return ch;
+static char **expand_strvec_to_strvec(char **argv)
+{
+ return expand_variables(argv, 0x100);
}
-/* All the callers guarantee this routine will never be
- * used right after a newline, so prompting is not needed.
- */
-static int file_peek(struct in_str *i)
+/* Used for expansion of right hand of assignments */
+/* NB: should NOT do globbing! "export v=/bin/c*; env | grep ^v=" outputs
+ * "v=/bin/c*" */
+static char *expand_string_to_string(const char *str)
{
- int ch;
- if (i->p && *i->p) {
- if (i->eof_flag && !i->p[1])
- return EOF;
- return *i->p;
- }
- ch = fgetc(i->file);
- i->eof_flag = (ch == EOF);
- i->peek_buf[0] = ch;
- i->peek_buf[1] = '\0';
- i->p = i->peek_buf;
- debug_printf("file_peek: got a '%c' %d\n", *i->p, *i->p);
- return ch;
+ char *argv[2], **list;
+
+ argv[0] = (char*)str;
+ argv[1] = NULL;
+ list = expand_variables(argv, 0x80); /* 0x80: make one-element expansion */
+ if (HUSH_DEBUG)
+ if (!list[0] || list[1])
+ bb_error_msg_and_die("BUG in varexp2");
+ /* actually, just move string 2*sizeof(char*) bytes back */
+ overlapping_strcpy((char*)list, list[0]);
+ debug_printf_expand("string_to_string='%s'\n", (char*)list);
+ return (char*)list;
}
-static void setup_file_in_str(struct in_str *i, FILE *f)
+/* Used for "eval" builtin */
+static char* expand_strvec_to_string(char **argv)
{
- i->peek = file_peek;
- i->get = file_get;
-#if ENABLE_HUSH_INTERACTIVE
- i->promptme = 1;
- i->promptmode = 0; /* PS1 */
-#endif
- i->file = f;
- i->p = NULL;
+ char **list;
+
+ list = expand_variables(argv, 0x80);
+ /* Convert all NULs to spaces */
+ if (list[0]) {
+ int n = 1;
+ while (list[n]) {
+ if (HUSH_DEBUG)
+ if (list[n-1] + strlen(list[n-1]) + 1 != list[n])
+ bb_error_msg_and_die("BUG in varexp3");
+ list[n][-1] = ' '; /* TODO: or to G.ifs[0]? */
+ n++;
+ }
+ }
+ overlapping_strcpy((char*)list, list[0]);
+ debug_printf_expand("strvec_to_string='%s'\n", (char*)list);
+ return (char*)list;
}
-static void setup_string_in_str(struct in_str *i, const char *s)
+static char **expand_assignments(char **argv, int count)
{
- i->peek = static_peek;
- i->get = static_get;
-#if ENABLE_HUSH_INTERACTIVE
- i->promptme = 1;
- i->promptmode = 0; /* PS1 */
-#endif
- i->p = s;
- i->eof_flag = 0;
+ int i;
+ char **p = NULL;
+ /* Expand assignments into one string each */
+ for (i = 0; i < count; i++) {
+ p = add_string_to_strings(p, expand_string_to_string(argv[i]));
+ }
+ return p;
}
@@ -1469,22 +1814,104 @@ static void restore_redirects(int squirrel[])
}
}
-static char **expand_assignments(char **argv, int count)
+
+#if !defined(DEBUG_CLEAN)
+#define free_pipe_list(head, indent) free_pipe_list(head)
+#define free_pipe(pi, indent) free_pipe(pi)
+#endif
+static int free_pipe_list(struct pipe *head, int indent);
+
+/* return code is the exit status of the pipe */
+static int free_pipe(struct pipe *pi, int indent)
{
- int i;
- char **p = NULL;
- /* Expand assignments into one string each */
- for (i = 0; i < count; i++) {
- p = add_string_to_strings(p, expand_string_to_string(argv[i]));
+ char **p;
+ struct command *command;
+ struct redir_struct *r, *rnext;
+ int a, i, ret_code = 0;
+
+ if (pi->stopped_cmds > 0)
+ return ret_code;
+ debug_printf_clean("%s run pipe: (pid %d)\n", indenter(indent), getpid());
+ for (i = 0; i < pi->num_cmds; i++) {
+ command = &pi->cmds[i];
+ debug_printf_clean("%s command %d:\n", indenter(indent), i);
+ if (command->argv) {
+ for (a = 0, p = command->argv; *p; a++, p++) {
+ debug_printf_clean("%s argv[%d] = %s\n", indenter(indent), a, *p);
+ }
+ free_strings(command->argv);
+ command->argv = NULL;
+ } else if (command->group) {
+ debug_printf_clean("%s begin group (grp_type:%d)\n", indenter(indent), command->grp_type);
+ ret_code = free_pipe_list(command->group, indent+3);
+ debug_printf_clean("%s end group\n", indenter(indent));
+ } else {
+ debug_printf_clean("%s (nil)\n", indenter(indent));
+ }
+ for (r = command->redirects; r; r = rnext) {
+ debug_printf_clean("%s redirect %d%s", indenter(indent), r->fd, redir_table[r->rd_type].descrip);
+ if (r->dup == -1) {
+ /* guard against the case >$FOO, where foo is unset or blank */
+ if (r->rd_filename) {
+ debug_printf_clean(" %s\n", r->rd_filename);
+ free(r->rd_filename);
+ r->rd_filename = NULL;
+ }
+ } else {
+ debug_printf_clean("&%d\n", r->dup);
+ }
+ rnext = r->next;
+ free(r);
+ }
+ command->redirects = NULL;
}
- return p;
+ free(pi->cmds); /* children are an array, they get freed all at once */
+ pi->cmds = NULL;
+#if ENABLE_HUSH_JOB
+ free(pi->cmdtext);
+ pi->cmdtext = NULL;
+#endif
+ return ret_code;
}
+static int free_pipe_list(struct pipe *head, int indent)
+{
+ int rcode = 0; /* if list has no members */
+ struct pipe *pi, *next;
+
+ for (pi = head; pi; pi = next) {
+#if HAS_KEYWORDS
+ debug_printf_clean("%s pipe reserved mode %d\n", indenter(indent), pi->res_word);
+#endif
+ rcode = free_pipe(pi, indent);
+ debug_printf_clean("%s pipe followup code %d\n", indenter(indent), pi->followup);
+ next = pi->next;
+ /*pi->next = NULL;*/
+ free(pi);
+ }
+ return rcode;
+}
+
+
+#if !BB_MMU
+typedef struct nommu_save_t {
+ char **new_env;
+ char **old_env;
+ char **argv;
+} nommu_save_t;
+#else
+#define pseudo_exec_argv(nommu_save, argv, assignment_cnt, argv_expanded) \
+ pseudo_exec_argv(argv, assignment_cnt, argv_expanded)
+#define pseudo_exec(nommu_save, command, argv_expanded) \
+ pseudo_exec(command, argv_expanded)
+#endif
+
/* Called after [v]fork() in run_pipe(), or from builtin_exec().
* 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? -- because of vfork! (vda) */
+static void pseudo_exec_argv(nommu_save_t *nommu_save, char **argv, int assignment_cnt, char **argv_expanded) NORETURN;
static void pseudo_exec_argv(nommu_save_t *nommu_save, char **argv, int assignment_cnt, char **argv_expanded)
{
int rcode;
@@ -1554,8 +1981,11 @@ static void pseudo_exec_argv(nommu_save_t *nommu_save, char **argv, int assignme
_exit(EXIT_FAILURE);
}
+static int run_list(struct pipe *pi);
+
/* Called after [v]fork() in run_pipe()
*/
+static void pseudo_exec(nommu_save_t *nommu_save, struct command *command, char **argv_expanded) NORETURN;
static void pseudo_exec(nommu_save_t *nommu_save, struct command *command, char **argv_expanded)
{
if (command->argv)
@@ -2461,77 +2891,6 @@ static int run_list(struct pipe *pi)
return rcode;
}
-/* return code is the exit status of the pipe */
-static int free_pipe(struct pipe *pi, int indent)
-{
- char **p;
- struct command *command;
- struct redir_struct *r, *rnext;
- int a, i, ret_code = 0;
-
- if (pi->stopped_cmds > 0)
- return ret_code;
- debug_printf_clean("%s run pipe: (pid %d)\n", indenter(indent), getpid());
- for (i = 0; i < pi->num_cmds; i++) {
- command = &pi->cmds[i];
- debug_printf_clean("%s command %d:\n", indenter(indent), i);
- if (command->argv) {
- for (a = 0, p = command->argv; *p; a++, p++) {
- debug_printf_clean("%s argv[%d] = %s\n", indenter(indent), a, *p);
- }
- free_strings(command->argv);
- command->argv = NULL;
- } else if (command->group) {
- debug_printf_clean("%s begin group (grp_type:%d)\n", indenter(indent), command->grp_type);
- ret_code = free_pipe_list(command->group, indent+3);
- debug_printf_clean("%s end group\n", indenter(indent));
- } else {
- debug_printf_clean("%s (nil)\n", indenter(indent));
- }
- for (r = command->redirects; r; r = rnext) {
- debug_printf_clean("%s redirect %d%s", indenter(indent), r->fd, redir_table[r->rd_type].descrip);
- if (r->dup == -1) {
- /* guard against the case >$FOO, where foo is unset or blank */
- if (r->rd_filename) {
- debug_printf_clean(" %s\n", r->rd_filename);
- free(r->rd_filename);
- r->rd_filename = NULL;
- }
- } else {
- debug_printf_clean("&%d\n", r->dup);
- }
- rnext = r->next;
- free(r);
- }
- command->redirects = NULL;
- }
- free(pi->cmds); /* children are an array, they get freed all at once */
- pi->cmds = NULL;
-#if ENABLE_HUSH_JOB
- free(pi->cmdtext);
- pi->cmdtext = NULL;
-#endif
- return ret_code;
-}
-
-static int free_pipe_list(struct pipe *head, int indent)
-{
- int rcode = 0; /* if list has no members */
- struct pipe *pi, *next;
-
- for (pi = head; pi; pi = next) {
-#if HAS_KEYWORDS
- debug_printf_clean("%s pipe reserved mode %d\n", indenter(indent), pi->res_word);
-#endif
- rcode = free_pipe(pi, indent);
- debug_printf_clean("%s pipe followup code %d\n", indenter(indent), pi->followup);
- next = pi->next;
- /*pi->next = NULL;*/
- free(pi);
- }
- return rcode;
-}
-
/* Select which version we will use */
static int run_and_free_list(struct pipe *pi)
{
@@ -2550,402 +2909,32 @@ static int run_and_free_list(struct pipe *pi)
}
-/* expand_strvec_to_strvec() takes a list of strings, expands
- * all variable references within and returns a pointer to
- * a list of expanded strings, possibly with larger number
- * of strings. (Think VAR="a b"; echo $VAR).
- * This new list is allocated as a single malloc block.
- * NULL-terminated list of char* pointers is at the beginning of it,
- * followed by strings themself.
- * Caller can deallocate entire list by single free(list). */
-
-/* Store given string, finalizing the word and starting new one whenever
- * we encounter IFS char(s). This is used for expanding variable values.
- * End-of-string does NOT finalize word: think about 'echo -$VAR-' */
-static int expand_on_ifs(o_string *output, int n, const char *str)
-{
- while (1) {
- int word_len = strcspn(str, G.ifs);
- if (word_len) {
- if (output->o_quote || !output->o_glob)
- o_addQstr(output, str, word_len);
- else /* protect backslashes against globbing up :) */
- o_addstr_duplicate_backslash(output, str, word_len);
- str += word_len;
- }
- if (!*str) /* EOL - do not finalize word */
- break;
- o_addchr(output, '\0');
- debug_print_list("expand_on_ifs", output, n);
- n = o_save_ptr(output, n);
- str += strspn(str, G.ifs); /* skip ifs chars */
- }
- debug_print_list("expand_on_ifs[1]", output, n);
- return n;
-}
-
-/* Expand all variable references in given string, adding words to list[]
- * at n, n+1,... positions. Return updated n (so that list[n] is next one
- * to be filled). This routine is extremely tricky: has to deal with
- * variables/parameters with whitespace, $* and $@, and constructs like
- * 'echo -$*-'. If you play here, you must run testsuite afterwards! */
-static int expand_vars_to_list(o_string *output, int n, char *arg, char or_mask)
-{
- /* or_mask is either 0 (normal case) or 0x80
- * (expansion of right-hand side of assignment == 1-element expand.
- * It will also do no globbing, and thus we must not backslash-quote!) */
-
- char first_ch, ored_ch;
- int i;
- const char *val;
- char *p;
-
- ored_ch = 0;
-
- debug_printf_expand("expand_vars_to_list: arg '%s'\n", arg);
- debug_print_list("expand_vars_to_list", output, n);
- n = o_save_ptr(output, n);
- debug_print_list("expand_vars_to_list[0]", output, n);
-
- while ((p = strchr(arg, SPECIAL_VAR_SYMBOL)) != NULL) {
-#if ENABLE_HUSH_TICK
- o_string subst_result = NULL_O_STRING;
-#endif
- o_addstr(output, arg, p - arg);
- debug_print_list("expand_vars_to_list[1]", output, n);
- arg = ++p;
- p = strchr(p, SPECIAL_VAR_SYMBOL);
-
- first_ch = arg[0] | or_mask; /* forced to "quoted" if or_mask = 0x80 */
- /* "$@" is special. Even if quoted, it can still
- * expand to nothing (not even an empty string) */
- if ((first_ch & 0x7f) != '@')
- ored_ch |= first_ch;
- val = NULL;
- switch (first_ch & 0x7f) {
- /* Highest bit in first_ch indicates that var is double-quoted */
- case '$': /* pid */
- val = utoa(G.root_pid);
- break;
- case '!': /* bg pid */
- val = G.last_bg_pid ? utoa(G.last_bg_pid) : (char*)"";
- break;
- case '?': /* exitcode */
- val = utoa(G.last_return_code);
- break;
- case '#': /* argc */
- val = utoa(G.global_argc ? G.global_argc-1 : 0);
- break;
- case '*':
- case '@':
- i = 1;
- if (!G.global_argv[i])
- break;
- ored_ch |= first_ch; /* do it for "$@" _now_, when we know it's not empty */
- if (!(first_ch & 0x80)) { /* unquoted $* or $@ */
- smallint sv = output->o_quote;
- /* unquoted var's contents should be globbed, so don't quote */
- output->o_quote = 0;
- while (G.global_argv[i]) {
- n = expand_on_ifs(output, n, G.global_argv[i]);
- debug_printf_expand("expand_vars_to_list: argv %d (last %d)\n", i, G.global_argc - 1);
- if (G.global_argv[i++][0] && G.global_argv[i]) {
- /* this argv[] is not empty and not last:
- * put terminating NUL, start new word */
- o_addchr(output, '\0');
- debug_print_list("expand_vars_to_list[2]", output, n);
- n = o_save_ptr(output, n);
- debug_print_list("expand_vars_to_list[3]", output, n);
- }
- }
- output->o_quote = sv;
- } else
- /* If or_mask is nonzero, we handle assignment 'a=....$@.....'
- * and in this case should treat it like '$*' - see 'else...' below */
- if (first_ch == ('@'|0x80) && !or_mask) { /* quoted $@ */
- while (1) {
- o_addQstr(output, G.global_argv[i], strlen(G.global_argv[i]));
- if (++i >= G.global_argc)
- break;
- o_addchr(output, '\0');
- debug_print_list("expand_vars_to_list[4]", output, n);
- n = o_save_ptr(output, n);
- }
- } else { /* quoted $*: add as one word */
- while (1) {
- o_addQstr(output, G.global_argv[i], strlen(G.global_argv[i]));
- if (!G.global_argv[++i])
- break;
- if (G.ifs[0])
- o_addchr(output, G.ifs[0]);
- }
- }
- break;
- case SPECIAL_VAR_SYMBOL: /* <SPECIAL_VAR_SYMBOL><SPECIAL_VAR_SYMBOL> */
- /* "Empty variable", used to make "" etc to not disappear */
- arg++;
- ored_ch = 0x80;
- break;
-#if ENABLE_HUSH_TICK
- case '`': { /* <SPECIAL_VAR_SYMBOL>`cmd<SPECIAL_VAR_SYMBOL> */
- struct in_str input;
- *p = '\0';
- arg++;
-//TODO: can we just stuff it into "output" directly?
- debug_printf_subst("SUBST '%s' first_ch %x\n", arg, first_ch);
- setup_string_in_str(&input, arg);
- process_command_subs(&subst_result, &input, NULL);
- debug_printf_subst("SUBST RES '%s'\n", subst_result.data);
- val = subst_result.data;
- goto store_val;
- }
-#endif
- default: /* <SPECIAL_VAR_SYMBOL>varname<SPECIAL_VAR_SYMBOL> */
- *p = '\0';
- arg[0] = first_ch & 0x7f;
- if (isdigit(arg[0])) {
- i = xatoi_u(arg);
- if (i < G.global_argc)
- val = G.global_argv[i];
- /* else val remains NULL: $N with too big N */
- } else
- val = lookup_param(arg);
- arg[0] = first_ch;
-#if ENABLE_HUSH_TICK
- store_val:
-#endif
- *p = SPECIAL_VAR_SYMBOL;
- if (!(first_ch & 0x80)) { /* unquoted $VAR */
- debug_printf_expand("unquoted '%s', output->o_quote:%d\n", val, output->o_quote);
- if (val) {
- /* unquoted var's contents should be globbed, so don't quote */
- smallint sv = output->o_quote;
- output->o_quote = 0;
- n = expand_on_ifs(output, n, val);
- val = NULL;
- output->o_quote = sv;
- }
- } else { /* quoted $VAR, val will be appended below */
- debug_printf_expand("quoted '%s', output->o_quote:%d\n", val, output->o_quote);
- }
- }
- if (val) {
- o_addQstr(output, val, strlen(val));
- }
-
-#if ENABLE_HUSH_TICK
- o_free(&subst_result);
-#endif
- arg = ++p;
- } /* end of "while (SPECIAL_VAR_SYMBOL is found) ..." */
-
- if (arg[0]) {
- debug_print_list("expand_vars_to_list[a]", output, n);
- /* this part is literal, and it was already pre-quoted
- * if needed (much earlier), do not use o_addQstr here! */
- o_addstr(output, arg, strlen(arg) + 1);
- debug_print_list("expand_vars_to_list[b]", output, n);
- } else if (output->length == o_get_last_ptr(output, n) /* expansion is empty */
- && !(ored_ch & 0x80) /* and all vars were not quoted. */
- ) {
- n--;
- /* allow to reuse list[n] later without re-growth */
- output->has_empty_slot = 1;
- } else {
- o_addchr(output, '\0');
- }
- return n;
-}
-
-static char **expand_variables(char **argv, int or_mask)
-{
- int n;
- char **list;
- char **v;
- o_string output = NULL_O_STRING;
-
- if (or_mask & 0x100) {
- output.o_quote = 1; /* protect against globbing for "$var" */
- /* (unquoted $var will temporarily switch it off) */
- output.o_glob = 1;
- }
-
- n = 0;
- v = argv;
- while (*v) {
- n = expand_vars_to_list(&output, n, *v, (char)or_mask);
- v++;
- }
- debug_print_list("expand_variables", &output, n);
-
- /* output.data (malloced in one block) gets returned in "list" */
- list = o_finalize_list(&output, n);
- debug_print_strings("expand_variables[1]", list);
- return list;
-}
-
-static char **expand_strvec_to_strvec(char **argv)
-{
- return expand_variables(argv, 0x100);
-}
-
-/* Used for expansion of right hand of assignments */
-/* NB: should NOT do globbing! "export v=/bin/c*; env | grep ^v=" outputs
- * "v=/bin/c*" */
-static char *expand_string_to_string(const char *str)
-{
- char *argv[2], **list;
-
- argv[0] = (char*)str;
- argv[1] = NULL;
- list = expand_variables(argv, 0x80); /* 0x80: make one-element expansion */
- if (HUSH_DEBUG)
- if (!list[0] || list[1])
- bb_error_msg_and_die("BUG in varexp2");
- /* actually, just move string 2*sizeof(char*) bytes back */
- overlapping_strcpy((char*)list, list[0]);
- debug_printf_expand("string_to_string='%s'\n", (char*)list);
- return (char*)list;
-}
-
-/* Used for "eval" builtin */
-static char* expand_strvec_to_string(char **argv)
-{
- char **list;
-
- list = expand_variables(argv, 0x80);
- /* Convert all NULs to spaces */
- if (list[0]) {
- int n = 1;
- while (list[n]) {
- if (HUSH_DEBUG)
- if (list[n-1] + strlen(list[n-1]) + 1 != list[n])
- bb_error_msg_and_die("BUG in varexp3");
- list[n][-1] = ' '; /* TODO: or to G.ifs[0]? */
- n++;
- }
- }
- overlapping_strcpy((char*)list, list[0]);
- debug_printf_expand("strvec_to_string='%s'\n", (char*)list);
- return (char*)list;
-}
-
-
-/* Used to get/check local shell variables */
-static struct variable *get_local_var(const char *name)
-{
- struct variable *cur;
- int len;
-
- if (!name)
- return NULL;
- len = strlen(name);
- for (cur = G.top_var; cur; cur = cur->next) {
- if (strncmp(cur->varstr, name, len) == 0 && cur->varstr[len] == '=')
- return cur;
- }
- return NULL;
-}
-
-/* str holds "NAME=VAL" and is expected to be malloced.
- * We take ownership of it. */
-static int set_local_var(char *str, int flg_export)
+/* Peek ahead in the in_str to find out if we have a "&n" construct,
+ * as in "2>&1", that represents duplicating a file descriptor.
+ * Return either -2 (syntax error), -1 (no &), or the number found.
+ */
+static int redirect_dup_num(struct in_str *input)
{
- struct variable *cur;
- char *value;
- int name_len;
-
- value = strchr(str, '=');
- if (!value) { /* not expected to ever happen? */
- free(str);
- return -1;
- }
+ int ch, d = 0, ok = 0;
+ ch = i_peek(input);
+ if (ch != '&') return -1;
- name_len = value - str + 1; /* including '=' */
- cur = G.top_var; /* cannot be NULL (we have HUSH_VERSION and it's RO) */
- while (1) {
- if (strncmp(cur->varstr, str, name_len) != 0) {
- if (!cur->next) {
- /* Bail out. Note that now cur points
- * to last var in linked list */
- break;
- }
- cur = cur->next;
- continue;
- }
- /* We found an existing var with this name */
- *value = '\0';
- if (cur->flg_read_only) {
- bb_error_msg("%s: readonly variable", str);
- free(str);
- return -1;
- }
- debug_printf_env("%s: unsetenv '%s'\n", __func__, str);
- unsetenv(str); /* just in case */
- *value = '=';
- if (strcmp(cur->varstr, str) == 0) {
- free_and_exp:
- free(str);
- goto exp;
- }
- if (cur->max_len >= strlen(str)) {
- /* This one is from startup env, reuse space */
- strcpy(cur->varstr, str);
- goto free_and_exp;
- }
- /* max_len == 0 signifies "malloced" var, which we can
- * (and has to) free */
- if (!cur->max_len)
- free(cur->varstr);
- cur->max_len = 0;
- goto set_str_and_exp;
+ i_getch(input); /* get the & */
+ ch = i_peek(input);
+ if (ch == '-') {
+ i_getch(input);
+ return -3; /* "-" represents "close me" */
}
-
- /* Not found - create next variable struct */
- cur->next = xzalloc(sizeof(*cur));
- cur = cur->next;
-
- set_str_and_exp:
- cur->varstr = str;
- exp:
- if (flg_export)
- cur->flg_export = 1;
- if (cur->flg_export) {
- debug_printf_env("%s: putenv '%s'\n", __func__, cur->varstr);
- return putenv(cur->varstr);
+ while (isdigit(ch)) {
+ d = d*10 + (ch-'0');
+ ok = 1;
+ i_getch(input);
+ ch = i_peek(input);
}
- return 0;
-}
-
-static void unset_local_var(const char *name)
-{
- struct variable *cur;
- struct variable *prev = prev; /* for gcc */
- int name_len;
+ if (ok) return d;
- if (!name)
- return;
- name_len = strlen(name);
- cur = G.top_var;
- while (cur) {
- if (strncmp(cur->varstr, name, name_len) == 0 && cur->varstr[name_len] == '=') {
- if (cur->flg_read_only) {
- bb_error_msg("%s: readonly variable", name);
- return;
- }
- /* prev is ok to use here because 1st variable, HUSH_VERSION,
- * is ro, and we cannot reach this code on the 1st pass */
- prev->next = cur->next;
- debug_printf_env("%s: unsetenv '%s'\n", __func__, cur->varstr);
- bb_unsetenv(cur->varstr);
- if (!cur->max_len)
- free(cur->varstr);
- free(cur);
- return;
- }
- prev = cur;
- cur = cur->next;
- }
+ bb_error_msg("ambiguous redirect");
+ return -2;
}
/* The src parameter allows us to peek forward to a possible &n syntax
@@ -2997,6 +2986,7 @@ static int setup_redirect(struct parse_context *ctx, int fd, redir_type style,
return 0;
}
+
static struct pipe *new_pipe(void)
{
struct pipe *pi;
@@ -3006,6 +2996,91 @@ static struct pipe *new_pipe(void)
return pi;
}
+/* Command (member of a pipe) is complete. The only possible error here
+ * is out of memory, in which case xmalloc exits. */
+static int done_command(struct parse_context *ctx)
+{
+ /* The command is really already in the pipe structure, so
+ * advance the pipe counter and make a new, null command. */
+ struct pipe *pi = ctx->pipe;
+ struct command *command = ctx->command;
+
+ if (command) {
+ if (command->group == NULL
+ && command->argv == NULL
+ && command->redirects == NULL
+ ) {
+ debug_printf_parse("done_command: skipping null cmd, num_cmds=%d\n", pi->num_cmds);
+ return pi->num_cmds;
+ }
+ pi->num_cmds++;
+ debug_printf_parse("done_command: ++num_cmds=%d\n", pi->num_cmds);
+ } else {
+ debug_printf_parse("done_command: initializing, num_cmds=%d\n", pi->num_cmds);
+ }
+
+ /* Only real trickiness here is that the uncommitted
+ * command structure is not counted in pi->num_cmds. */
+ pi->cmds = xrealloc(pi->cmds, sizeof(*pi->cmds) * (pi->num_cmds+1));
+ command = &pi->cmds[pi->num_cmds];
+ memset(command, 0, sizeof(*command));
+
+ ctx->command = command;
+ /* but ctx->pipe and ctx->list_head remain unchanged */
+
+ return pi->num_cmds; /* used only for 0/nonzero check */
+}
+
+static void done_pipe(struct parse_context *ctx, pipe_style type)
+{
+ int not_null;
+
+ debug_printf_parse("done_pipe entered, followup %d\n", type);
+ /* Close previous command */
+ not_null = done_command(ctx);
+ ctx->pipe->followup = type;
+ IF_HAS_KEYWORDS(ctx->pipe->pi_inverted = ctx->ctx_inverted;)
+ IF_HAS_KEYWORDS(ctx->ctx_inverted = 0;)
+ IF_HAS_KEYWORDS(ctx->pipe->res_word = ctx->ctx_res_w;)
+
+ /* Without this check, even just <enter> on command line generates
+ * tree of three NOPs (!). Which is harmless but annoying.
+ * IOW: it is safe to do it unconditionally.
+ * RES_NONE case is for "for a in; do ..." (empty IN set)
+ * to work, possibly other cases too. */
+ if (not_null IF_HAS_KEYWORDS(|| ctx->ctx_res_w != RES_NONE)) {
+ struct pipe *new_p;
+ debug_printf_parse("done_pipe: adding new pipe: "
+ "not_null:%d ctx->ctx_res_w:%d\n",
+ not_null, ctx->ctx_res_w);
+ new_p = new_pipe();
+ ctx->pipe->next = new_p;
+ ctx->pipe = new_p;
+ ctx->command = NULL; /* needed! */
+ /* RES_THEN, RES_DO etc are "sticky" -
+ * they remain set for commands inside if/while.
+ * This is used to control execution.
+ * RES_FOR and RES_IN are NOT sticky (needed to support
+ * cases where variable or value happens to match a keyword):
+ */
+#if ENABLE_HUSH_LOOPS
+ if (ctx->ctx_res_w == RES_FOR
+ || ctx->ctx_res_w == RES_IN)
+ ctx->ctx_res_w = RES_NONE;
+#endif
+#if ENABLE_HUSH_CASE
+ if (ctx->ctx_res_w == RES_MATCH)
+ ctx->ctx_res_w = RES_CASEI;
+#endif
+ /* Create the memory for command, roughly:
+ * ctx->pipe->cmds = new struct command;
+ * ctx->command = &ctx->pipe->cmds[0];
+ */
+ done_command(ctx);
+ }
+ debug_printf_parse("done_pipe return\n");
+}
+
static void initialize_context(struct parse_context *ctx)
{
memset(ctx, 0, sizeof(*ctx));
@@ -3017,6 +3092,7 @@ static void initialize_context(struct parse_context *ctx)
done_command(ctx);
}
+
/* If a reserved word is found and processed, parse context is modified
* and 1 is returned.
* Handles if, then, elif, else, fi, for, while, until, do, done.
@@ -3260,119 +3336,6 @@ static int done_word(o_string *word, struct parse_context *ctx)
return 0;
}
-/* Command (member of a pipe) is complete. The only possible error here
- * is out of memory, in which case xmalloc exits. */
-static int done_command(struct parse_context *ctx)
-{
- /* The command is really already in the pipe structure, so
- * advance the pipe counter and make a new, null command. */
- struct pipe *pi = ctx->pipe;
- struct command *command = ctx->command;
-
- if (command) {
- if (command->group == NULL
- && command->argv == NULL
- && command->redirects == NULL
- ) {
- debug_printf_parse("done_command: skipping null cmd, num_cmds=%d\n", pi->num_cmds);
- return pi->num_cmds;
- }
- pi->num_cmds++;
- debug_printf_parse("done_command: ++num_cmds=%d\n", pi->num_cmds);
- } else {
- debug_printf_parse("done_command: initializing, num_cmds=%d\n", pi->num_cmds);
- }
-
- /* Only real trickiness here is that the uncommitted
- * command structure is not counted in pi->num_cmds. */
- pi->cmds = xrealloc(pi->cmds, sizeof(*pi->cmds) * (pi->num_cmds+1));
- command = &pi->cmds[pi->num_cmds];
- memset(command, 0, sizeof(*command));
-
- ctx->command = command;
- /* but ctx->pipe and ctx->list_head remain unchanged */
-
- return pi->num_cmds; /* used only for 0/nonzero check */
-}
-
-static void done_pipe(struct parse_context *ctx, pipe_style type)
-{
- int not_null;
-
- debug_printf_parse("done_pipe entered, followup %d\n", type);
- /* Close previous command */
- not_null = done_command(ctx);
- ctx->pipe->followup = type;
- IF_HAS_KEYWORDS(ctx->pipe->pi_inverted = ctx->ctx_inverted;)
- IF_HAS_KEYWORDS(ctx->ctx_inverted = 0;)
- IF_HAS_KEYWORDS(ctx->pipe->res_word = ctx->ctx_res_w;)
-
- /* Without this check, even just <enter> on command line generates
- * tree of three NOPs (!). Which is harmless but annoying.
- * IOW: it is safe to do it unconditionally.
- * RES_NONE case is for "for a in; do ..." (empty IN set)
- * to work, possibly other cases too. */
- if (not_null IF_HAS_KEYWORDS(|| ctx->ctx_res_w != RES_NONE)) {
- struct pipe *new_p;
- debug_printf_parse("done_pipe: adding new pipe: "
- "not_null:%d ctx->ctx_res_w:%d\n",
- not_null, ctx->ctx_res_w);
- new_p = new_pipe();
- ctx->pipe->next = new_p;
- ctx->pipe = new_p;
- ctx->command = NULL; /* needed! */
- /* RES_THEN, RES_DO etc are "sticky" -
- * they remain set for commands inside if/while.
- * This is used to control execution.
- * RES_FOR and RES_IN are NOT sticky (needed to support
- * cases where variable or value happens to match a keyword):
- */
-#if ENABLE_HUSH_LOOPS
- if (ctx->ctx_res_w == RES_FOR
- || ctx->ctx_res_w == RES_IN)
- ctx->ctx_res_w = RES_NONE;
-#endif
-#if ENABLE_HUSH_CASE
- if (ctx->ctx_res_w == RES_MATCH)
- ctx->ctx_res_w = RES_CASEI;
-#endif
- /* Create the memory for command, roughly:
- * ctx->pipe->cmds = new struct command;
- * ctx->command = &ctx->pipe->cmds[0];
- */
- done_command(ctx);
- }
- debug_printf_parse("done_pipe return\n");
-}
-
-/* Peek ahead in the in_str to find out if we have a "&n" construct,
- * as in "2>&1", that represents duplicating a file descriptor.
- * Return either -2 (syntax error), -1 (no &), or the number found.
- */
-static int redirect_dup_num(struct in_str *input)
-{
- int ch, d = 0, ok = 0;
- ch = i_peek(input);
- if (ch != '&') return -1;
-
- i_getch(input); /* get the & */
- ch = i_peek(input);
- if (ch == '-') {
- i_getch(input);
- return -3; /* "-" represents "close me" */
- }
- while (isdigit(ch)) {
- d = d*10 + (ch-'0');
- ok = 1;
- i_getch(input);
- ch = i_peek(input);
- }
- if (ok) return d;
-
- bb_error_msg("ambiguous redirect");
- return -2;
-}
-
/* If a redirect is immediately preceded by a number, that number is
* supposed to tell which file descriptor to redirect. This routine
* looks for such preceding numbers. In an ideal world this routine
@@ -3444,6 +3407,9 @@ static FILE *generate_stream_from_list(struct pipe *head)
/* 'head' is freed by the caller */
}
+static int parse_stream(o_string *dest, struct parse_context *ctx,
+ struct in_str *input0, const char *end_trigger);
+
/* Return code is exit status of the process that is run. */
static int process_command_subs(o_string *dest,
struct in_str *input,
@@ -3544,16 +3510,6 @@ static int parse_group(o_string *dest, struct parse_context *ctx,
/* command remains "open", available for possible redirects */
}
-/* Basically useful version until someone wants to get fancier,
- * see the bash man page under "Parameter Expansion" */
-static const char *lookup_param(const char *src)
-{
- struct variable *var = get_local_var(src);
- if (var)
- return strchr(var->varstr, '=') + 1;
- return NULL;
-}
-
#if ENABLE_HUSH_TICK
/* Subroutines for copying $(...) and `...` things */
static void add_till_backquote(o_string *dest, struct in_str *input);
@@ -3761,7 +3717,7 @@ static int handle_dollar(o_string *dest, struct in_str *input)
* -1 on EOF (but if end_trigger == NULL then return 0),
* 1 for syntax error */
static int parse_stream(o_string *dest, struct parse_context *ctx,
- struct in_str *input, const char *end_trigger)
+ struct in_str *input, const char *end_trigger)
{
int ch, m;
int redir_fd;
@@ -4680,45 +4636,49 @@ static int builtin_read(char **argv)
*/
static int builtin_set(char **argv)
{
- struct variable *e;
- char **pp;
+ int n;
+ char **pp, **g_argv;
char *arg = *++argv;
if (arg == NULL) {
+ struct variable *e;
for (e = G.top_var; e; e = e->next)
puts(e->varstr);
- } else {
- /* NB: G.global_argv[0] ($0) is never freed/changed */
+ return EXIT_SUCCESS;
+ }
- if (G.global_args_malloced) {
- pp = G.global_argv;
- while (*++pp)
- free(*pp);
- G.global_argv[1] = NULL;
- } else {
- G.global_args_malloced = 1;
- pp = xzalloc(sizeof(pp[0]) * 2);
- pp[0] = G.global_argv[0]; /* retain $0 */
- G.global_argv = pp;
+ do {
+ if (arg[0] == '+')
+ continue;
+ if (arg[0] != '-')
+ break;
+ if (arg[1] == '-' && arg[2] == '\0') {
+ argv++;
+ break;
}
- do {
- if (arg[0] == '+')
- continue;
- if (arg[0] != '-')
- break;
- if (arg[1] == '-' && arg[2] == '\0') {
- argv++;
- break;
- }
- } while ((arg = *++argv) != NULL);
- /* Now argv[0] is 1st argument */
+ } while ((arg = *++argv) != NULL);
+ /* Now argv[0] is 1st argument */
- /* This realloc's G.global_argv */
- G.global_argv = pp = add_strings_to_strings(G.global_argv, argv, /*dup:*/ 1);
- G.global_argc = 1;
+ /* NB: G.global_argv[0] ($0) is never freed/changed */
+ g_argv = G.global_argv;
+ if (G.global_args_malloced) {
+ pp = g_argv;
while (*++pp)
- G.global_argc++;
+ free(*pp);
+ g_argv[1] = NULL;
+ } else {
+ G.global_args_malloced = 1;
+ pp = xzalloc(sizeof(pp[0]) * 2);
+ pp[0] = g_argv[0]; /* retain $0 */
+ g_argv = pp;
}
+ /* This realloc's G.global_argv */
+ G.global_argv = pp = add_strings_to_strings(g_argv, argv, /*dup:*/ 1);
+
+ n = 1;
+ while (*++pp)
+ n++;
+ G.global_argc = n;
return EXIT_SUCCESS;
}