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xargs: simplify option parsing

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This commit is contained in:
Denis Vlasenko 2006-09-29 08:20:30 +00:00
parent 981b24db5e
commit 6248a734e2
2 changed files with 91 additions and 115 deletions
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205
findutils/xargs.c
View File

@ -45,54 +45,52 @@
#endif
/*
This function have special algorithm.
Don`t use fork and include to main!
This function has special algorithm.
Don't use fork and include to main!
*/
static int xargs_exec(char *const *args)
{
pid_t p;
volatile int exec_errno = 0; /* shared vfork stack */
int status;
if ((p = vfork()) >= 0) {
if (p == 0) {
/* vfork -- child */
execvp(args[0], args);
exec_errno = errno; /* set error to shared stack */
_exit(1);
} else {
/* vfork -- parent */
int status;
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;
} else {
if (WEXITSTATUS(status) == 255) {
bb_error_msg("%s: exited with status 255; aborting", args[0]);
return 124;
}
if (WIFSTOPPED(status)) {
bb_error_msg("%s: stopped by signal %d",
args[0], WSTOPSIG(status));
return 125;
}
if (WIFSIGNALED(status)) {
bb_error_msg("%s: terminated by signal %d",
args[0], WTERMSIG(status));
return 125;
}
if (WEXITSTATUS(status) != 0)
return 123;
return 0;
}
}
} else {
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;
}
if (WEXITSTATUS(status) == 255) {
bb_error_msg("%s: exited with status 255; aborting", args[0]);
return 124;
}
if (WIFSTOPPED(status)) {
bb_error_msg("%s: stopped by signal %d",
args[0], WSTOPSIG(status));
return 125;
}
if (WIFSIGNALED(status)) {
bb_error_msg("%s: terminated by signal %d",
args[0], WTERMSIG(status));
return 125;
}
if (WEXITSTATUS(status))
return 123;
return 0;
}
@ -105,7 +103,7 @@ typedef struct xlist_s {
static int eof_stdin_detected;
#define ISBLANK(c) ((c) == ' ' || (c) == '\t')
#define ISSPACE(c) (ISBLANK (c) || (c) == '\n' || (c) == '\r' \
#define ISSPACE(c) (ISBLANK(c) || (c) == '\n' || (c) == '\r' \
|| (c) == '\f' || (c) == '\v')
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_QUOTES
@ -304,19 +302,10 @@ static int xargs_ask_confirmation(void)
return 1;
return 0;
}
# define OPT_INC_P 1
#else
# define OPT_INC_P 0
# define xargs_ask_confirmation() 1
#endif /* CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION */
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
# define OPT_INC_X 1
#else
# define OPT_INC_X 0
#endif
#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)
@ -371,35 +360,37 @@ static xlist_t *process0_stdin(xlist_t * list_arg, const char *eof_str ATTRIBUTE
}
return list_arg;
}
# define READ_ARGS(l, e, nmc, mc) (*read_args)(l, e, nmc, mc)
# define OPT_INC_0 1 /* future use */
#else
# define OPT_INC_0 0 /* future use */
# define READ_ARGS(l, e, nmc, mc) process_stdin(l, e, nmc, mc)
#endif /* CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM */
/* Correct regardless of combination of CONFIG_xxx */
enum {
OPTBIT_VERBOSE = 0,
OPTBIT_NO_EMPTY,
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 ,)
#define OPT_VERBOSE (1<<0)
#define OPT_NO_EMPTY (1<<1)
#define OPT_UPTO_NUMBER (1<<2)
#define OPT_UPTO_SIZE (1<<3)
#define OPT_EOF_STRING (1<<4)
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
#define OPT_INTERACTIVE (1<<5)
#else
#define OPT_INTERACTIVE (0) /* require for algorithm &| */
#endif
#define OPT_TERMINATE (1<<(5+OPT_INC_P))
#define OPT_ZEROTERM (1<<(5+OPT_INC_P+OPT_INC_X))
/* next future
#define OPT_NEXT_OTHER (1<<(5+OPT_INC_P+OPT_INC_X+OPT_INC_0))
*/
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,
};
#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")
int xargs_main(int argc, char **argv)
{
char **args;
int i, a, n;
int i, n;
xlist_t *list = NULL;
xlist_t *cur;
int child_error = 0;
@ -410,42 +401,33 @@ int xargs_main(int argc, char **argv)
const char *eof_str = "_";
unsigned long opt;
size_t n_max_chars;
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
xlist_t *(*read_args) (xlist_t *, const char *, size_t, char *) = process_stdin;
#if ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM
xlist_t* (*read_args)(xlist_t*, const char*, size_t, char*) = process_stdin;
#else
#define read_args process_stdin
#endif
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
bb_opt_complementally = "pt";
#endif
opt = bb_getopt_ulflags(argc, argv, OPTION_STR, &max_args, &max_chars, &eof_str);
opt = bb_getopt_ulflags(argc, argv, "+trn:s:e::"
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_CONFIRMATION
"p"
#endif
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT
"x"
#endif
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
"0"
#endif
,&max_args, &max_chars, &eof_str);
if (opt & OPT_ZEROTERM)
USE_FEATURE_XARGS_SUPPORT_ZERO_TERM(read_args = process0_stdin);
a = argc - optind;
argc -= optind;
argv += optind;
if (a == 0) {
if (!argc) {
/* default behavior is to echo all the filenames */
*argv = "echo";
a++;
argc++;
}
orig_arg_max = ARG_MAX;
if (orig_arg_max == -1)
orig_arg_max = LONG_MAX;
orig_arg_max -= 2048; /* POSIX.2 requires subtracting 2048. */
if ((opt & OPT_UPTO_SIZE)) {
orig_arg_max -= 2048; /* POSIX.2 requires subtracting 2048 */
if (opt & OPT_UPTO_SIZE) {
n_max_chars = bb_xgetularg10_bnd(max_chars, 1, orig_arg_max);
for (i = 0; i < a; i++) {
for (i = 0; i < argc; i++) {
n_chars += strlen(*argv) + 1;
}
if (n_max_chars < n_chars) {
@ -463,19 +445,14 @@ int xargs_main(int argc, char **argv)
}
max_chars = xmalloc(n_max_chars);
if ((opt & OPT_UPTO_NUMBER)) {
if (opt & OPT_UPTO_NUMBER) {
n_max_arg = bb_xgetularg10_bnd(max_args, 1, INT_MAX);
} else {
n_max_arg = n_max_chars;
}
#ifdef CONFIG_FEATURE_XARGS_SUPPORT_ZERO_TERM
if (opt & OPT_ZEROTERM)
read_args = process0_stdin;
#endif
while ((list = READ_ARGS(list, eof_str, n_max_chars, max_chars)) != NULL ||
(opt & OPT_NO_EMPTY) == 0)
while ((list = read_args(list, eof_str, n_max_chars, max_chars)) != NULL ||
!(opt & OPT_NO_EMPTY))
{
opt |= OPT_NO_EMPTY;
n = 0;
@ -501,13 +478,13 @@ int xargs_main(int argc, char **argv)
}
#endif /* CONFIG_FEATURE_XARGS_SUPPORT_TERMOPT */
/* allocating pointers for execvp:
a*arg, n*arg from stdin, NULL */
args = xzalloc((n + a + 1) * sizeof(char *));
/* allocate pointers for execvp:
argc*arg, n*arg from stdin, NULL */
args = xzalloc((n + argc + 1) * sizeof(char *));
/* Store the command to be executed
/* store the command to be executed
(taken from the command line) */
for (i = 0; i < a; i++)
for (i = 0; i < argc; i++)
args[i] = argv[i];
/* (taken from stdin) */
for (cur = list; n; cur = cur->link) {
@ -515,21 +492,21 @@ int xargs_main(int argc, char **argv)
n--;
}
if ((opt & (OPT_INTERACTIVE | OPT_VERBOSE))) {
if (opt & (OPT_INTERACTIVE | OPT_VERBOSE)) {
for (i = 0; args[i]; i++) {
if (i)
fputc(' ', stderr);
fputs(args[i], stderr);
}
if ((opt & OPT_INTERACTIVE) == 0)
if (!(opt & OPT_INTERACTIVE))
fputc('\n', stderr);
}
if ((opt & OPT_INTERACTIVE) == 0 || xargs_ask_confirmation() != 0) {
if (!(opt & OPT_INTERACTIVE) || xargs_ask_confirmation()) {
child_error = xargs_exec(args);
}
/* clean up */
for (i = a; args[i]; i++) {
for (i = argc; args[i]; i++) {
cur = list;
list = list->link;
free(cur);
@ -539,9 +516,7 @@ int xargs_main(int argc, char **argv)
break;
}
}
#ifdef CONFIG_FEATURE_CLEAN_UP
free(max_chars);
#endif
if (ENABLE_FEATURE_CLEAN_UP) free(max_chars);
return child_error;
}

1
libbb/getopt_ulflags.c
View File

@ -91,6 +91,7 @@ const struct option *bb_applet_long_options
is to name the config option CONFIG_FEATURE_<applet>_LONG_OPTIONS.
const char *bb_opt_complementally
this should be bb_opt_complementary, but we'll just keep it as
bb_opt_complementally due to the Russian origins