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