mirror of
https://git.busybox.net/busybox.git
synced 2024-12-20 11:53:23 +08:00
xargs: code shrink -15 bytes
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
parent
d2d327db6d
commit
d5fa1a0f49
@ -122,53 +122,49 @@ typedef struct xlist_t {
|
||||
char xstr[1];
|
||||
} xlist_t;
|
||||
|
||||
static smallint eof_stdin_detected;
|
||||
|
||||
#define ISBLANK(c) ((c) == ' ' || (c) == '\t')
|
||||
#define ISSPACE(c) (ISBLANK(c) || (c) == '\n' || (c) == '\r' \
|
||||
|| (c) == '\f' || (c) == '\v')
|
||||
/* In POSIX/C locale isspace is only these chars: "\t\n\v\f\r" and space.
|
||||
* "\t\n\v\f\r" happen to have ASCII codes 9,10,11,12,13.
|
||||
*/
|
||||
#define ISSPACE(a) ({ unsigned char xargs__isspace = (a) - 9; xargs__isspace == (' ' - 9) || xargs__isspace <= (13 - 9); })
|
||||
|
||||
#if ENABLE_FEATURE_XARGS_SUPPORT_QUOTES
|
||||
static xlist_t *process_stdin(xlist_t *list_arg,
|
||||
static xlist_t* process_stdin(xlist_t *list_arg,
|
||||
const char *eof_str, size_t mc, char *buf)
|
||||
{
|
||||
#define NORM 0
|
||||
#define QUOTE 1
|
||||
#define BACKSLASH 2
|
||||
#define SPACE 4
|
||||
|
||||
char *s = NULL; /* start word */
|
||||
char *p = NULL; /* pointer to end word */
|
||||
char *s = NULL; /* start of the word */
|
||||
char *p = NULL; /* pointer to end of the word */
|
||||
char q = '\0'; /* quote char */
|
||||
char state = NORM;
|
||||
char eof_str_detected = 0;
|
||||
size_t line_l = 0; /* size loaded args line */
|
||||
int c; /* current char */
|
||||
size_t line_l = 0; /* size of loaded args */
|
||||
xlist_t *cur;
|
||||
xlist_t *prev;
|
||||
|
||||
prev = cur = list_arg;
|
||||
while (1) {
|
||||
if (!cur) break;
|
||||
while (cur) {
|
||||
prev = cur;
|
||||
line_l += cur->length;
|
||||
cur = cur->link;
|
||||
}
|
||||
|
||||
while (!eof_stdin_detected) {
|
||||
c = getchar();
|
||||
while (1) {
|
||||
int c = getchar();
|
||||
if (c == EOF) {
|
||||
eof_stdin_detected = 1;
|
||||
if (s)
|
||||
goto unexpected_eof;
|
||||
break;
|
||||
}
|
||||
if (eof_str_detected)
|
||||
if (eof_str_detected) /* skip till EOF */
|
||||
continue;
|
||||
if (state == BACKSLASH) {
|
||||
state = NORM;
|
||||
goto set;
|
||||
} else if (state == QUOTE) {
|
||||
}
|
||||
if (state == QUOTE) {
|
||||
if (c != q)
|
||||
goto set;
|
||||
q = '\0';
|
||||
@ -202,7 +198,7 @@ static xlist_t *process_stdin(xlist_t *list_arg,
|
||||
bb_error_msg_and_die("unmatched %s quote",
|
||||
q == '\'' ? "single" : "double");
|
||||
}
|
||||
/* word loaded */
|
||||
/* A full word is loaded */
|
||||
if (eof_str) {
|
||||
eof_str_detected = (strcmp(s, eof_str) == 0);
|
||||
}
|
||||
@ -220,10 +216,8 @@ static xlist_t *process_stdin(xlist_t *list_arg,
|
||||
}
|
||||
prev = cur;
|
||||
line_l += length;
|
||||
if (line_l > mc) {
|
||||
/* stop memory usage :-) */
|
||||
if (line_l > mc) /* limit stop memory usage */
|
||||
break;
|
||||
}
|
||||
}
|
||||
s = NULL;
|
||||
state = NORM;
|
||||
@ -233,33 +227,32 @@ static xlist_t *process_stdin(xlist_t *list_arg,
|
||||
}
|
||||
#else
|
||||
/* The variant does not support single quotes, double quotes or backslash */
|
||||
static xlist_t *process_stdin(xlist_t *list_arg,
|
||||
static xlist_t* process_stdin(xlist_t *list_arg,
|
||||
const char *eof_str, size_t mc, char *buf)
|
||||
{
|
||||
|
||||
int c; /* current char */
|
||||
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 */
|
||||
char *s = NULL; /* start of the word */
|
||||
char *p = NULL; /* pointer to end of the word */
|
||||
size_t line_l = 0; /* size of loaded args */
|
||||
xlist_t *cur;
|
||||
xlist_t *prev;
|
||||
|
||||
prev = cur = list_arg;
|
||||
while (1) {
|
||||
if (!cur) break;
|
||||
while (cur) {
|
||||
prev = cur;
|
||||
line_l += cur->length;
|
||||
cur = cur->link;
|
||||
}
|
||||
|
||||
while (!eof_stdin_detected) {
|
||||
c = getchar();
|
||||
while (1) {
|
||||
int c = getchar();
|
||||
if (c == EOF) {
|
||||
eof_stdin_detected = 1;
|
||||
if (s == NULL)
|
||||
break;
|
||||
}
|
||||
if (eof_str_detected)
|
||||
if (eof_str_detected) { /* skip till EOF */
|
||||
continue;
|
||||
}
|
||||
if (c == EOF || ISSPACE(c)) {
|
||||
if (s == NULL)
|
||||
continue;
|
||||
@ -271,7 +264,7 @@ static xlist_t *process_stdin(xlist_t *list_arg,
|
||||
bb_error_msg_and_die("argument line too long");
|
||||
*p++ = (c == EOF ? '\0' : c);
|
||||
if (c == EOF) { /* word's delimiter or EOF detected */
|
||||
/* word loaded */
|
||||
/* A full word is loaded */
|
||||
if (eof_str) {
|
||||
eof_str_detected = (strcmp(s, eof_str) == 0);
|
||||
}
|
||||
@ -289,12 +282,10 @@ static xlist_t *process_stdin(xlist_t *list_arg,
|
||||
}
|
||||
prev = cur;
|
||||
line_l += length;
|
||||
if (line_l > mc) {
|
||||
/* stop memory usage :-) */
|
||||
if (line_l > mc) /* limit stop memory usage */
|
||||
break;
|
||||
}
|
||||
s = NULL;
|
||||
}
|
||||
s = NULL;
|
||||
}
|
||||
}
|
||||
return list_arg;
|
||||
@ -325,28 +316,25 @@ static int xargs_ask_confirmation(void)
|
||||
#endif /* FEATURE_XARGS_SUPPORT_CONFIRMATION */
|
||||
|
||||
#if ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM
|
||||
static xlist_t *process0_stdin(xlist_t *list_arg,
|
||||
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 */
|
||||
char *p = NULL; /* pointer to end word */
|
||||
size_t line_l = 0; /* size loaded args line */
|
||||
char *s = NULL; /* start of the word */
|
||||
char *p = NULL; /* pointer to end of the word */
|
||||
size_t line_l = 0; /* size of loaded args */
|
||||
xlist_t *cur;
|
||||
xlist_t *prev;
|
||||
|
||||
prev = cur = list_arg;
|
||||
while (1) {
|
||||
if (!cur) break;
|
||||
while (cur) {
|
||||
prev = cur;
|
||||
line_l += cur->length;
|
||||
cur = cur->link;
|
||||
}
|
||||
|
||||
while (!eof_stdin_detected) {
|
||||
c = getchar();
|
||||
while (1) {
|
||||
int c = getchar();
|
||||
if (c == EOF) {
|
||||
eof_stdin_detected = 1;
|
||||
if (s == NULL)
|
||||
break;
|
||||
c = '\0';
|
||||
@ -357,7 +345,7 @@ static xlist_t *process0_stdin(xlist_t *list_arg,
|
||||
bb_error_msg_and_die("argument line too long");
|
||||
*p++ = c;
|
||||
if (c == '\0') { /* word's delimiter or EOF detected */
|
||||
/* word loaded */
|
||||
/* A full word is loaded */
|
||||
size_t length = (p - buf);
|
||||
/* Dont xzalloc - it can be quite big */
|
||||
cur = xmalloc(offsetof(xlist_t, xstr) + length);
|
||||
@ -371,10 +359,8 @@ static xlist_t *process0_stdin(xlist_t *list_arg,
|
||||
}
|
||||
prev = cur;
|
||||
line_l += length;
|
||||
if (line_l > mc) {
|
||||
/* stop memory usage :-) */
|
||||
if (line_l > mc) /* limit stop memory usage */
|
||||
break;
|
||||
}
|
||||
s = NULL;
|
||||
}
|
||||
}
|
||||
@ -412,12 +398,11 @@ enum {
|
||||
int xargs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
||||
int xargs_main(int argc, char **argv)
|
||||
{
|
||||
char **args;
|
||||
int i, n;
|
||||
xlist_t *list = NULL;
|
||||
xlist_t *cur;
|
||||
int child_error = 0;
|
||||
char *max_args, *max_chars;
|
||||
char *max_args;
|
||||
char *max_chars;
|
||||
char *buf;
|
||||
int n_max_arg;
|
||||
const char *eof_str = NULL;
|
||||
unsigned opt;
|
||||
@ -441,15 +426,12 @@ int xargs_main(int argc, char **argv)
|
||||
|
||||
argv += optind;
|
||||
argc -= optind;
|
||||
if (!argc) {
|
||||
if (!argv[0]) {
|
||||
/* default behavior is to echo all the filenames */
|
||||
*argv = (char*)"echo";
|
||||
*--argv = (char*)"echo";
|
||||
argc++;
|
||||
}
|
||||
|
||||
n_max_chars = ARG_MAX; /* might be calling sysconf(_SC_ARG_MAX) */
|
||||
if (n_max_chars < 4*1024); /* paranoia */
|
||||
n_max_chars = LONG_MAX;
|
||||
/* The Open Group Base Specifications Issue 6:
|
||||
* "The xargs utility shall limit the command line length such that
|
||||
* when the command line is invoked, the combined argument
|
||||
@ -457,27 +439,32 @@ int xargs_main(int argc, char **argv)
|
||||
* in the System Interfaces volume of IEEE Std 1003.1-2001)
|
||||
* shall not exceed {ARG_MAX}-2048 bytes".
|
||||
*/
|
||||
n_max_chars = ARG_MAX; /* might be calling sysconf(_SC_ARG_MAX) */
|
||||
if (n_max_chars < 4*1024); /* paranoia */
|
||||
n_max_chars = 4*1024;
|
||||
n_max_chars -= 2048;
|
||||
/* Sanity check for systems with huge ARG_MAX defines (e.g., Suns which
|
||||
* have it at 1 meg). Things will work fine with a large ARG_MAX but it
|
||||
* will probably hurt the system more than it needs to; an array of this
|
||||
* size is allocated.
|
||||
* have it at 1 meg). Things will work fine with a large ARG_MAX
|
||||
* but it will probably hurt the system more than it needs to;
|
||||
* an array of this size is allocated.
|
||||
*/
|
||||
if (n_max_chars > 20 * 1024)
|
||||
n_max_chars = 20 * 1024;
|
||||
|
||||
if (opt & OPT_UPTO_SIZE) {
|
||||
int i;
|
||||
size_t n_chars = 0;
|
||||
n_max_chars = xatoul_range(max_chars, 1, n_max_chars);
|
||||
for (i = 0; i < argc; i++) {
|
||||
n_chars += strlen(*argv) + 1;
|
||||
}
|
||||
if (n_max_chars <= n_chars) {
|
||||
bb_error_msg_and_die("can't fit single argument within argument list size limit");
|
||||
for (i = 0; argv[i]; i++) {
|
||||
n_chars += strlen(argv[i]) + 1;
|
||||
}
|
||||
n_max_chars -= n_chars;
|
||||
if ((ssize_t)n_max_chars <= 0) {
|
||||
bb_error_msg_and_die("can't fit single argument within argument list size limit");
|
||||
}
|
||||
}
|
||||
max_chars = xmalloc(n_max_chars);
|
||||
|
||||
buf = xmalloc(n_max_chars);
|
||||
|
||||
if (opt & OPT_UPTO_NUMBER) {
|
||||
n_max_arg = xatoul_range(max_args, 1, INT_MAX);
|
||||
@ -485,10 +472,14 @@ int xargs_main(int argc, char **argv)
|
||||
n_max_arg = n_max_chars;
|
||||
}
|
||||
|
||||
while ((list = read_args(list, eof_str, n_max_chars, max_chars)) != NULL ||
|
||||
!(opt & OPT_NO_EMPTY))
|
||||
{
|
||||
while ((list = read_args(list, eof_str, n_max_chars, buf)) != NULL
|
||||
|| !(opt & OPT_NO_EMPTY)
|
||||
) {
|
||||
char **args;
|
||||
xlist_t *cur;
|
||||
int i, n;
|
||||
size_t n_chars = 0;
|
||||
|
||||
opt |= OPT_NO_EMPTY;
|
||||
n = 0;
|
||||
#if ENABLE_FEATURE_XARGS_SUPPORT_TERMOPT
|
||||
@ -510,15 +501,14 @@ int xargs_main(int argc, char **argv)
|
||||
break;
|
||||
}
|
||||
}
|
||||
#endif /* FEATURE_XARGS_SUPPORT_TERMOPT */
|
||||
#endif
|
||||
|
||||
/* allocate pointers for execvp:
|
||||
argc*arg, n*arg from stdin, NULL */
|
||||
args = xzalloc((n + argc + 1) * sizeof(char *));
|
||||
/* allocate pointers for execvp */
|
||||
args = xzalloc(sizeof(args[0]) * (argc + n + 1));
|
||||
|
||||
/* store the command to be executed
|
||||
(taken from the command line) */
|
||||
for (i = 0; i < argc; i++)
|
||||
* (taken from the command line) */
|
||||
for (i = 0; argv[i]; i++)
|
||||
args[i] = argv[i];
|
||||
/* (taken from stdin) */
|
||||
for (cur = list; n; cur = cur->link) {
|
||||
@ -535,6 +525,7 @@ int xargs_main(int argc, char **argv)
|
||||
if (!(opt & OPT_INTERACTIVE))
|
||||
bb_putchar_stderr('\n');
|
||||
}
|
||||
|
||||
if (!(opt & OPT_INTERACTIVE) || xargs_ask_confirmation()) {
|
||||
child_error = xargs_exec(args);
|
||||
}
|
||||
@ -546,12 +537,15 @@ int xargs_main(int argc, char **argv)
|
||||
free(cur);
|
||||
}
|
||||
free(args);
|
||||
|
||||
if (child_error > 0 && child_error != 123) {
|
||||
break;
|
||||
}
|
||||
} /* while */
|
||||
|
||||
if (ENABLE_FEATURE_CLEAN_UP)
|
||||
free(max_chars);
|
||||
free(buf);
|
||||
|
||||
return child_error;
|
||||
}
|
||||
|
||||
|
||||
@ -26,4 +26,9 @@ testing "xargs does not stop on underscore ('new' GNU behavior)" \
|
||||
"a _ b\n" \
|
||||
"" "a\n_\nb\n"
|
||||
|
||||
testing "xargs -s7 can take one-char input" \
|
||||
"xargs -s7" \
|
||||
"a\n" \
|
||||
"" "a\n"
|
||||
|
||||
exit $FAILCOUNT
|
||||
|
||||
Loading…
Reference in New Issue
Block a user