*
*/
-#include "busybox.h"
+#include "libbb.h"
+
+/* This is a NOEXEC applet. Be very careful! */
+
/* COMPAT: SYSV version defaults size (and has a max value of) to 470.
We try to make it as large as possible. */
#ifdef TEST
-# ifndef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
-# define CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
+# ifndef ENABLE_FEATURE_XARGS_SUPPORT_CONFIRMATION
+# define ENABLE_FEATURE_XARGS_SUPPORT_CONFIRMATION 1
# endif
-# ifndef CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
-# define CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
+# ifndef ENABLE_FEATURE_XARGS_SUPPORT_QUOTES
+# define ENABLE_FEATURE_XARGS_SUPPORT_QUOTES 1
# endif
-# ifndef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
-# define CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
+# ifndef ENABLE_FEATURE_XARGS_SUPPORT_TERMOPT
+# define ENABLE_FEATURE_XARGS_SUPPORT_TERMOPT 1
# endif
-# ifndef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
-# define CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
+# ifndef ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM
+# define ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM 1
# endif
#endif
This function has special algorithm.
Don't use fork and include to main!
*/
-static int xargs_exec(char *const *args)
+static int xargs_exec(char **args)
{
- pid_t p;
- volatile int exec_errno = 0; /* shared vfork stack */
int status;
- p = vfork();
- if (p < 0)
- bb_perror_msg_and_die("vfork");
-
- if (p == 0) {
- /* vfork -- child */
- execvp(args[0], args);
- exec_errno = errno; /* set error to shared stack */
- _exit(1);
- }
-
- /* vfork -- parent */
- while (wait(&status) == (pid_t) -1)
- if (errno != EINTR)
- break;
- if (exec_errno) {
- errno = exec_errno;
- bb_perror_msg("%s", args[0]);
- return exec_errno == ENOENT ? 127 : 126;
+ status = spawn_and_wait(args);
+ if (status < 0) {
+ bb_simple_perror_msg(args[0]);
+ return errno == ENOENT ? 127 : 126;
}
- if (WEXITSTATUS(status) == 255) {
+ if (status == 255) {
bb_error_msg("%s: exited with status 255; aborting", args[0]);
return 124;
}
+/* Huh? I think we won't see this, ever. We don't wait with WUNTRACED!
if (WIFSTOPPED(status)) {
bb_error_msg("%s: stopped by signal %d",
args[0], WSTOPSIG(status));
return 125;
}
- if (WIFSIGNALED(status)) {
+*/
+ if (status >= 1000) {
bb_error_msg("%s: terminated by signal %d",
- args[0], WTERMSIG(status));
+ args[0], status - 1000);
return 125;
}
- if (WEXITSTATUS(status))
+ if (status)
return 123;
return 0;
}
-typedef struct xlist_s {
- char *data;
- size_t lenght;
- struct xlist_s *link;
+typedef struct xlist_t {
+ struct xlist_t *link;
+ size_t length;
+ char xstr[1];
} xlist_t;
-static int eof_stdin_detected;
+static smallint eof_stdin_detected;
#define ISBLANK(c) ((c) == ' ' || (c) == '\t')
#define ISSPACE(c) (ISBLANK(c) || (c) == '\n' || (c) == '\r' \
|| (c) == '\f' || (c) == '\v')
-#ifdef CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
-static xlist_t *process_stdin(xlist_t * list_arg,
+#if ENABLE_FEATURE_XARGS_SUPPORT_QUOTES
+static xlist_t *process_stdin(xlist_t *list_arg,
const char *eof_str, size_t mc, char *buf)
{
#define NORM 0
char *s = NULL; /* start word */
char *p = NULL; /* pointer to end word */
- char q = 0; /* quote char */
+ char q = '\0'; /* quote char */
char state = NORM;
char eof_str_detected = 0;
size_t line_l = 0; /* size loaded args line */
xlist_t *cur;
xlist_t *prev;
- for (prev = cur = list_arg; cur; cur = cur->link) {
- line_l += cur->lenght; /* previous allocated */
- if (prev != cur)
- prev = prev->link;
+ prev = cur = list_arg;
+ while (1) {
+ if (!cur) break;
+ prev = cur;
+ line_l += cur->length;
+ cur = cur->link;
}
while (!eof_stdin_detected) {
c = getchar();
if (c == EOF) {
- eof_stdin_detected++;
+ eof_stdin_detected = 1;
if (s)
goto unexpected_eof;
break;
state = NORM;
goto set;
} else if (state == QUOTE) {
- if (c == q) {
- q = 0;
- state = NORM;
- } else {
+ if (c != q)
goto set;
- }
- } else { /* if(state == NORM) */
-
+ q = '\0';
+ state = NORM;
+ } else { /* if (state == NORM) */
if (ISSPACE(c)) {
if (s) {
-unexpected_eof:
+ unexpected_eof:
state = SPACE;
- c = 0;
+ c = '\0';
goto set;
}
} else {
q = c;
state = QUOTE;
} else {
-set:
+ set:
if ((size_t)(p - buf) >= mc)
bb_error_msg_and_die("argument line too long");
*p++ = c;
}
/* word loaded */
if (eof_str) {
- eof_str_detected = strcmp(s, eof_str) == 0;
+ eof_str_detected = (strcmp(s, eof_str) == 0);
}
if (!eof_str_detected) {
- size_t lenght = (p - buf);
-
- cur = xmalloc(sizeof(xlist_t) + lenght);
- cur->data = memcpy(cur + 1, s, lenght);
- cur->lenght = lenght;
+ size_t length = (p - buf);
+ /* Dont xzalloc - it can be quite big */
+ cur = xmalloc(offsetof(xlist_t, xstr) + length);
cur->link = NULL;
+ cur->length = length;
+ memcpy(cur->xstr, s, length);
if (prev == NULL) {
list_arg = cur;
} else {
prev->link = cur;
}
prev = cur;
- line_l += lenght;
+ line_l += length;
if (line_l > mc) {
/* stop memory usage :-) */
break;
}
#else
/* The variant does not support single quotes, double quotes or backslash */
-static xlist_t *process_stdin(xlist_t * list_arg,
- const char *eof_str, size_t mc, char *buf)
+static xlist_t *process_stdin(xlist_t *list_arg,
+ const char *eof_str, size_t mc, char *buf)
{
int c; /* current char */
- int eof_str_detected = 0;
+ char eof_str_detected = 0;
char *s = NULL; /* start word */
char *p = NULL; /* pointer to end word */
size_t line_l = 0; /* size loaded args line */
xlist_t *cur;
xlist_t *prev;
- for (prev = cur = list_arg; cur; cur = cur->link) {
- line_l += cur->lenght; /* previous allocated */
- if (prev != cur)
- prev = prev->link;
+ prev = cur = list_arg;
+ while (1) {
+ if (!cur) break;
+ prev = cur;
+ line_l += cur->length;
+ cur = cur->link;
}
while (!eof_stdin_detected) {
c = getchar();
if (c == EOF) {
- eof_stdin_detected++;
+ eof_stdin_detected = 1;
}
if (eof_str_detected)
continue;
}
if (s == NULL)
s = p = buf;
- if ((p - buf) >= mc)
+ if ((size_t)(p - buf) >= mc)
bb_error_msg_and_die("argument line too long");
- *p++ = c == EOF ? 0 : c;
+ *p++ = (c == EOF ? '\0' : c);
if (c == EOF) { /* word's delimiter or EOF detected */
/* word loaded */
if (eof_str) {
- eof_str_detected = strcmp(s, eof_str) == 0;
+ eof_str_detected = (strcmp(s, eof_str) == 0);
}
if (!eof_str_detected) {
- size_t lenght = (p - buf);
-
- cur = xmalloc(sizeof(xlist_t) + lenght);
- cur->data = memcpy(cur + 1, s, lenght);
- cur->lenght = lenght;
+ size_t length = (p - buf);
+ /* Dont xzalloc - it can be quite big */
+ cur = xmalloc(offsetof(xlist_t, xstr) + length);
cur->link = NULL;
+ cur->length = length;
+ memcpy(cur->xstr, s, length);
if (prev == NULL) {
list_arg = cur;
} else {
prev->link = cur;
}
prev = cur;
- line_l += lenght;
+ line_l += length;
if (line_l > mc) {
/* stop memory usage :-) */
break;
}
return list_arg;
}
-#endif /* CONFIG_FEATURE_XARGS_SUPPORT_QUOTES */
+#endif /* FEATURE_XARGS_SUPPORT_QUOTES */
-#ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
+#if ENABLE_FEATURE_XARGS_SUPPORT_CONFIRMATION
/* Prompt the user for a response, and
if the user responds affirmatively, return true;
- otherwise, return false. Used "/dev/tty", not stdin. */
+ otherwise, return false. Uses "/dev/tty", not stdin. */
static int xargs_ask_confirmation(void)
{
- static FILE *tty_stream;
+ FILE *tty_stream;
int c, savec;
- if (!tty_stream) {
- tty_stream = xfopen(CURRENT_TTY, "r");
- /* pranoidal security by vodz */
- fcntl(fileno(tty_stream), F_SETFD, FD_CLOEXEC);
- }
+ tty_stream = xfopen_for_read(CURRENT_TTY);
fputs(" ?...", stderr);
fflush(stderr);
c = savec = getc(tty_stream);
while (c != EOF && c != '\n')
c = getc(tty_stream);
- if (savec == 'y' || savec == 'Y')
- return 1;
- return 0;
+ fclose(tty_stream);
+ return (savec == 'y' || savec == 'Y');
}
#else
# define xargs_ask_confirmation() 1
-#endif /* CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION */
+#endif /* FEATURE_XARGS_SUPPORT_CONFIRMATION */
-#ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
-static xlist_t *process0_stdin(xlist_t * list_arg, const char *eof_str ATTRIBUTE_UNUSED,
- size_t mc, char *buf)
+#if ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM
+static xlist_t *process0_stdin(xlist_t *list_arg,
+ const char *eof_str UNUSED_PARAM, size_t mc, char *buf)
{
int c; /* current char */
char *s = NULL; /* start word */
xlist_t *cur;
xlist_t *prev;
- for (prev = cur = list_arg; cur; cur = cur->link) {
- line_l += cur->lenght; /* previous allocated */
- if (prev != cur)
- prev = prev->link;
+ prev = cur = list_arg;
+ while (1) {
+ if (!cur) break;
+ prev = cur;
+ line_l += cur->length;
+ cur = cur->link;
}
while (!eof_stdin_detected) {
c = getchar();
if (c == EOF) {
- eof_stdin_detected++;
+ eof_stdin_detected = 1;
if (s == NULL)
break;
- c = 0;
+ c = '\0';
}
if (s == NULL)
s = p = buf;
if ((size_t)(p - buf) >= mc)
bb_error_msg_and_die("argument line too long");
*p++ = c;
- if (c == 0) { /* word's delimiter or EOF detected */
+ if (c == '\0') { /* word's delimiter or EOF detected */
/* word loaded */
- size_t lenght = (p - buf);
-
- cur = xmalloc(sizeof(xlist_t) + lenght);
- cur->data = memcpy(cur + 1, s, lenght);
- cur->lenght = lenght;
+ size_t length = (p - buf);
+ /* Dont xzalloc - it can be quite big */
+ cur = xmalloc(offsetof(xlist_t, xstr) + length);
cur->link = NULL;
+ cur->length = length;
+ memcpy(cur->xstr, s, length);
if (prev == NULL) {
list_arg = cur;
} else {
prev->link = cur;
}
prev = cur;
- line_l += lenght;
+ line_l += length;
if (line_l > mc) {
/* stop memory usage :-) */
break;
}
return list_arg;
}
-#endif /* CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM */
+#endif /* FEATURE_XARGS_SUPPORT_ZERO_TERM */
/* Correct regardless of combination of CONFIG_xxx */
enum {
OPTBIT_UPTO_NUMBER,
OPTBIT_UPTO_SIZE,
OPTBIT_EOF_STRING,
- USE_FEATURE_XARGS_SUPPORT_CONFIRMATION(OPTBIT_INTERACTIVE,)
- USE_FEATURE_XARGS_SUPPORT_TERMOPT( OPTBIT_TERMINATE ,)
- USE_FEATURE_XARGS_SUPPORT_ZERO_TERM( OPTBIT_ZEROTERM ,)
-
- OPT_VERBOSE = 1<<OPTBIT_VERBOSE ,
- OPT_NO_EMPTY = 1<<OPTBIT_NO_EMPTY ,
- OPT_UPTO_NUMBER = 1<<OPTBIT_UPTO_NUMBER,
- OPT_UPTO_SIZE = 1<<OPTBIT_UPTO_SIZE ,
- OPT_EOF_STRING = 1<<OPTBIT_EOF_STRING ,
- OPT_INTERACTIVE = USE_FEATURE_XARGS_SUPPORT_CONFIRMATION((1<<OPTBIT_INTERACTIVE)) + 0,
- OPT_TERMINATE = USE_FEATURE_XARGS_SUPPORT_TERMOPT( (1<<OPTBIT_TERMINATE )) + 0,
- OPT_ZEROTERM = USE_FEATURE_XARGS_SUPPORT_ZERO_TERM( (1<<OPTBIT_ZEROTERM )) + 0,
+ OPTBIT_EOF_STRING1,
+ IF_FEATURE_XARGS_SUPPORT_CONFIRMATION(OPTBIT_INTERACTIVE,)
+ IF_FEATURE_XARGS_SUPPORT_TERMOPT( OPTBIT_TERMINATE ,)
+ IF_FEATURE_XARGS_SUPPORT_ZERO_TERM( OPTBIT_ZEROTERM ,)
+
+ OPT_VERBOSE = 1 << OPTBIT_VERBOSE ,
+ OPT_NO_EMPTY = 1 << OPTBIT_NO_EMPTY ,
+ OPT_UPTO_NUMBER = 1 << OPTBIT_UPTO_NUMBER,
+ OPT_UPTO_SIZE = 1 << OPTBIT_UPTO_SIZE ,
+ OPT_EOF_STRING = 1 << OPTBIT_EOF_STRING , /* GNU: -e[<param>] */
+ OPT_EOF_STRING1 = 1 << OPTBIT_EOF_STRING1, /* SUS: -E<param> */
+ OPT_INTERACTIVE = IF_FEATURE_XARGS_SUPPORT_CONFIRMATION((1 << OPTBIT_INTERACTIVE)) + 0,
+ OPT_TERMINATE = IF_FEATURE_XARGS_SUPPORT_TERMOPT( (1 << OPTBIT_TERMINATE )) + 0,
+ OPT_ZEROTERM = IF_FEATURE_XARGS_SUPPORT_ZERO_TERM( (1 << OPTBIT_ZEROTERM )) + 0,
};
-#define OPTION_STR "+trn:s:e::" \
- USE_FEATURE_XARGS_SUPPORT_CONFIRMATION("p") \
- USE_FEATURE_XARGS_SUPPORT_TERMOPT( "x") \
- USE_FEATURE_XARGS_SUPPORT_ZERO_TERM( "0")
+#define OPTION_STR "+trn:s:e::E:" \
+ IF_FEATURE_XARGS_SUPPORT_CONFIRMATION("p") \
+ IF_FEATURE_XARGS_SUPPORT_TERMOPT( "x") \
+ IF_FEATURE_XARGS_SUPPORT_ZERO_TERM( "0")
+int xargs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int xargs_main(int argc, char **argv)
{
char **args;
int n_max_arg;
size_t n_chars = 0;
long orig_arg_max;
- const char *eof_str = "_";
+ const char *eof_str = NULL;
unsigned opt;
size_t n_max_chars;
#if ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM
#define read_args process_stdin
#endif
- opt = getopt32(argc, argv, OPTION_STR, &max_args, &max_chars, &eof_str);
+ opt = getopt32(argv, OPTION_STR, &max_args, &max_chars, &eof_str, &eof_str);
+
+ /* -E ""? You may wonder why not just omit -E?
+ * This is used for portability:
+ * old xargs was using "_" as default for -E / -e */
+ if ((opt & OPT_EOF_STRING1) && eof_str[0] == '\0')
+ eof_str = NULL;
if (opt & OPT_ZEROTERM)
- USE_FEATURE_XARGS_SUPPORT_ZERO_TERM(read_args = process0_stdin);
+ IF_FEATURE_XARGS_SUPPORT_ZERO_TERM(read_args = process0_stdin);
- argc -= optind;
argv += optind;
+ argc -= optind;
if (!argc) {
/* default behavior is to echo all the filenames */
- *argv = "echo";
+ *argv = (char*)"echo";
argc++;
}
opt |= OPT_NO_EMPTY;
n = 0;
n_chars = 0;
-#ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
+#if ENABLE_FEATURE_XARGS_SUPPORT_TERMOPT
for (cur = list; cur;) {
- n_chars += cur->lenght;
+ n_chars += cur->length;
n++;
cur = cur->link;
if (n_chars > n_max_chars || (n == n_max_arg && cur)) {
}
#else
for (cur = list; cur; cur = cur->link) {
- n_chars += cur->lenght;
+ n_chars += cur->length;
n++;
if (n_chars > n_max_chars || n == n_max_arg) {
break;
}
}
-#endif /* CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT */
+#endif /* FEATURE_XARGS_SUPPORT_TERMOPT */
/* allocate pointers for execvp:
argc*arg, n*arg from stdin, NULL */
args[i] = argv[i];
/* (taken from stdin) */
for (cur = list; n; cur = cur->link) {
- args[i++] = cur->data;
+ args[i++] = cur->xstr;
n--;
}
if (child_error > 0 && child_error != 123) {
break;
}
- }
- if (ENABLE_FEATURE_CLEAN_UP) free(max_chars);
+ } /* while */
+ if (ENABLE_FEATURE_CLEAN_UP)
+ free(max_chars);
return child_error;
}
{
fprintf(stderr, "Usage: %s [-p] [-r] [-t] -[x] [-n max_arg] [-s max_chars]\n",
applet_name);
- exit(1);
+ exit(EXIT_FAILURE);
}
int main(int argc, char **argv)
projects / oweals / busybox.git / blobdiff