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authorDenys Vlasenko <vda.linux@googlemail.com>2014-02-27 10:17:06 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2014-02-27 10:17:06 (GMT)
commit6f068904dc142657bb596f91196f9113f1838cbe (patch)
treeac02741b3c8b74bf3a078aeb13ef7ff1c5e1e23f
parent6885e49ba596239a0b0d3631fd72fc2692fbb65c (diff)
downloadbusybox-6f068904dc142657bb596f91196f9113f1838cbe.tar.gz
busybox-6f068904dc142657bb596f91196f9113f1838cbe.tar.bz2
xargs: add support for -I and -i. Closes 493
function old new delta process_stdin_with_replace - 195 +195 xmalloc_substitute_string - 145 +145 xargs_main 808 884 +76 count_strstr - 45 +45 packed_usage 29580 29571 -9 parse_params 1445 1416 -29 func_exec 285 138 -147 ------------------------------------------------------------------------------ (add/remove: 4/0 grow/shrink: 1/3 up/down: 461/-185) Total: 276 bytes text data bss dec hex filename 922156 932 17692 940780 e5aec busybox_old 922440 932 17692 941064 e5c08 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--findutils/find.c32
-rw-r--r--findutils/xargs.c153
-rw-r--r--include/libbb.h2
-rw-r--r--libbb/replace.c45
4 files changed, 176 insertions, 56 deletions
diff --git a/findutils/find.c b/findutils/find.c
index 044f010..6d34f4d 100644
--- a/findutils/find.c
+++ b/findutils/find.c
@@ -402,34 +402,6 @@ struct globals {
G.recurse_flags = ACTION_RECURSE; \
} while (0)
-#if ENABLE_FEATURE_FIND_EXEC
-static unsigned count_subst(const char *str)
-{
- unsigned count = 0;
- while ((str = strstr(str, "{}")) != NULL) {
- count++;
- str++;
- }
- return count;
-}
-
-
-static char* subst(const char *src, unsigned count, const char* filename)
-{
- char *buf, *dst, *end;
- size_t flen = strlen(filename);
- /* we replace each '{}' with filename: growth by strlen-2 */
- buf = dst = xmalloc(strlen(src) + count*(flen-2) + 1);
- while ((end = strstr(src, "{}")) != NULL) {
- dst = mempcpy(dst, src, end - src);
- dst = mempcpy(dst, filename, flen);
- src = end + 2;
- }
- strcpy(dst, src);
- return buf;
-}
-#endif
-
/* Return values of ACTFs ('action functions') are a bit mask:
* bit 1=1: prune (use SKIP constant for setting it)
* bit 0=1: matched successfully (TRUE)
@@ -613,7 +585,7 @@ ACTF(exec)
char *argv[ap->exec_argc + 1];
#endif
for (i = 0; i < ap->exec_argc; i++)
- argv[i] = subst(ap->exec_argv[i], ap->subst_count[i], fileName);
+ argv[i] = xmalloc_substitute_string(ap->exec_argv[i], ap->subst_count[i], "{}", fileName);
argv[i] = NULL; /* terminate the list */
rc = spawn_and_wait(argv);
@@ -1091,7 +1063,7 @@ static action*** parse_params(char **argv)
ap->subst_count = xmalloc(ap->exec_argc * sizeof(int));
i = ap->exec_argc;
while (i--)
- ap->subst_count[i] = count_subst(ap->exec_argv[i]);
+ ap->subst_count[i] = count_strstr(ap->exec_argv[i], "{}");
}
#endif
#if ENABLE_FEATURE_FIND_PAREN
diff --git a/findutils/xargs.c b/findutils/xargs.c
index 0d1bb43..ed6dbd3 100644
--- a/findutils/xargs.c
+++ b/findutils/xargs.c
@@ -53,6 +53,13 @@
//config: Support -0: input items are terminated by a NUL character
//config: instead of whitespace, and the quotes and backslash
//config: are not special.
+//config:
+//config:config FEATURE_XARGS_SUPPORT_REPL_STR
+//config: bool "Enable -I STR: string to replace"
+//config: default y
+//config: depends on XARGS
+//config: help
+//config: Support -I STR and -i[STR] options.
//applet:IF_XARGS(APPLET_NOEXEC(xargs, xargs, BB_DIR_USR_BIN, BB_SUID_DROP, xargs))
@@ -85,19 +92,22 @@
struct globals {
char **args;
+#if ENABLE_FEATURE_XARGS_SUPPORT_REPL_STR
+ char **argv;
+ const char *repl_str;
+ char eol_ch;
+#endif
const char *eof_str;
int idx;
} FIX_ALIASING;
#define G (*(struct globals*)&bb_common_bufsiz1)
#define INIT_G() do { \
G.eof_str = NULL; /* need to clear by hand because we are NOEXEC applet */ \
+ IF_FEATURE_XARGS_SUPPORT_REPL_STR(G.repl_str = "{}";) \
+ IF_FEATURE_XARGS_SUPPORT_REPL_STR(G.eol_ch = '\n';) \
} while (0)
-/*
- * This function has special algorithm.
- * Don't use fork and include to main!
- */
static int xargs_exec(void)
{
int status;
@@ -301,7 +311,7 @@ static char* FAST_FUNC process0_stdin(int n_max_chars, int n_max_arg, char *buf)
c = '\0';
}
*p++ = c;
- if (c == '\0') { /* word's delimiter or EOF detected */
+ if (c == '\0') { /* NUL or EOF detected */
/* A full word is loaded */
store_param(s);
dbg_msg("args[]:'%s'", s);
@@ -323,10 +333,71 @@ static char* FAST_FUNC process0_stdin(int n_max_chars, int n_max_arg, char *buf)
}
#endif /* FEATURE_XARGS_SUPPORT_ZERO_TERM */
+#if ENABLE_FEATURE_XARGS_SUPPORT_REPL_STR
+/*
+ * Used if -I<repl> was specified.
+ * In this mode, words aren't appended to PROG ARGS.
+ * Instead, entire input line is read, then <repl> string
+ * in every PROG and ARG is replaced with the line:
+ * echo -e "ho ho\nhi" | xargs -I_ cmd __ _
+ * results in "cmd 'ho hoho ho' 'ho ho'"; "cmd 'hihi' 'hi'".
+ * -n MAX_ARGS seems to be ignored.
+ * Tested with GNU findutils 4.5.10.
+ */
+//FIXME: n_max_chars is not handled the same way as in GNU findutils.
+//FIXME: quoting is not implemented.
+static char* FAST_FUNC process_stdin_with_replace(int n_max_chars, int n_max_arg UNUSED_PARAM, char *buf)
+{
+ int i;
+ char *end, *p;
+
+ /* Free strings from last invocation, if any */
+ for (i = 0; G.args && G.args[i]; i++)
+ if (G.args[i] != G.argv[i])
+ free(G.args[i]);
+
+ end = buf + n_max_chars;
+ p = buf;
+
+ while (1) {
+ int c = getchar();
+ if (c == EOF || c == G.eol_ch) {
+ if (p == buf)
+ goto ret; /* empty line */
+ c = '\0';
+ }
+ *p++ = c;
+ if (c == '\0') { /* EOL or EOF detected */
+ i = 0;
+ while (G.argv[i]) {
+ char *arg = G.argv[i];
+ int count = count_strstr(arg, G.repl_str);
+ if (count != 0)
+ arg = xmalloc_substitute_string(arg, count, G.repl_str, s);
+ store_param(arg);
+ dbg_msg("args[]:'%s'", arg);
+ i++;
+ }
+ p = buf;
+ goto ret;
+ }
+ if (p == end) {
+ goto ret;
+ }
+ }
+ ret:
+ *p = '\0';
+ /* store_param(NULL) - caller will do it */
+ dbg_msg("return:'%s'", buf);
+ return buf;
+}
+#endif
+
#if ENABLE_FEATURE_XARGS_SUPPORT_CONFIRMATION
/* Prompt the user for a response, and
- if the user responds affirmatively, return true;
- otherwise, return false. Uses "/dev/tty", not stdin. */
+ * if user responds affirmatively, return true;
+ * otherwise, return false. Uses "/dev/tty", not stdin.
+ */
static int xargs_ask_confirmation(void)
{
FILE *tty_stream;
@@ -360,6 +431,9 @@ static int xargs_ask_confirmation(void)
//usage: "\n -e[STR] STR stops input processing"
//usage: "\n -n N Pass no more than N args to PROG"
//usage: "\n -s N Pass command line of no more than N bytes"
+//usage: IF_FEATURE_XARGS_SUPPORT_REPL_STR(
+//usage: "\n -I STR Replace STR within PROG ARGS with input line"
+//usage: )
//usage: IF_FEATURE_XARGS_SUPPORT_TERMOPT(
//usage: "\n -x Exit if size is exceeded"
//usage: )
@@ -378,6 +452,8 @@ enum {
IF_FEATURE_XARGS_SUPPORT_CONFIRMATION(OPTBIT_INTERACTIVE,)
IF_FEATURE_XARGS_SUPPORT_TERMOPT( OPTBIT_TERMINATE ,)
IF_FEATURE_XARGS_SUPPORT_ZERO_TERM( OPTBIT_ZEROTERM ,)
+ IF_FEATURE_XARGS_SUPPORT_REPL_STR( OPTBIT_REPLSTR ,)
+ IF_FEATURE_XARGS_SUPPORT_REPL_STR( OPTBIT_REPLSTR1 ,)
OPT_VERBOSE = 1 << OPTBIT_VERBOSE ,
OPT_NO_EMPTY = 1 << OPTBIT_NO_EMPTY ,
@@ -388,11 +464,14 @@ enum {
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,
+ OPT_REPLSTR = IF_FEATURE_XARGS_SUPPORT_REPL_STR( (1 << OPTBIT_REPLSTR )) + 0,
+ OPT_REPLSTR1 = IF_FEATURE_XARGS_SUPPORT_REPL_STR( (1 << OPTBIT_REPLSTR1 )) + 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")
+ IF_FEATURE_XARGS_SUPPORT_ZERO_TERM( "0") \
+ IF_FEATURE_XARGS_SUPPORT_REPL_STR( "I:i::")
int xargs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int xargs_main(int argc, char **argv)
@@ -405,7 +484,8 @@ int xargs_main(int argc, char **argv)
unsigned opt;
int n_max_chars;
int n_max_arg;
-#if ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM
+#if ENABLE_FEATURE_XARGS_SUPPORT_ZERO_TERM \
+ || ENABLE_FEATURE_XARGS_SUPPORT_REPL_STR
char* FAST_FUNC (*read_args)(int, int, char*) = process_stdin;
#else
#define read_args process_stdin
@@ -419,7 +499,10 @@ int xargs_main(int argc, char **argv)
"no-run-if-empty\0" No_argument "r"
;
#endif
- opt = getopt32(argv, OPTION_STR, &max_args, &max_chars, &G.eof_str, &G.eof_str);
+ opt = getopt32(argv, OPTION_STR,
+ &max_args, &max_chars, &G.eof_str, &G.eof_str
+ IF_FEATURE_XARGS_SUPPORT_REPL_STR(, &G.repl_str, &G.repl_str)
+ );
/* -E ""? You may wonder why not just omit -E?
* This is used for portability:
@@ -427,8 +510,10 @@ int xargs_main(int argc, char **argv)
if ((opt & OPT_EOF_STRING1) && G.eof_str[0] == '\0')
G.eof_str = NULL;
- if (opt & OPT_ZEROTERM)
- IF_FEATURE_XARGS_SUPPORT_ZERO_TERM(read_args = process0_stdin);
+ if (opt & OPT_ZEROTERM) {
+ IF_FEATURE_XARGS_SUPPORT_ZERO_TERM(read_args = process0_stdin;)
+ IF_FEATURE_XARGS_SUPPORT_REPL_STR(G.eol_ch = '\0';)
+ }
argv += optind;
argc -= optind;
@@ -486,20 +571,36 @@ int xargs_main(int argc, char **argv)
/* if (n_max_arg > n_max_chars) n_max_arg = n_max_chars */
}
- /* Allocate pointers for execvp */
- /* We can statically allocate (argc + n_max_arg + 1) elements
- * and do not bother with resizing args[], but on 64-bit machines
- * this results in args[] vector which is ~8 times bigger
- * than n_max_chars! That is, with n_max_chars == 20k,
- * args[] will take 160k (!), which will most likely be
- * almost entirely unused.
- */
- /* See store_param() for matching 256-step growth logic */
- G.args = xmalloc(sizeof(G.args[0]) * ((argc + 0xff) & ~0xff));
-
- /* Store the command to be executed, part 1 */
- for (i = 0; argv[i]; i++)
- G.args[i] = argv[i];
+#if ENABLE_FEATURE_XARGS_SUPPORT_REPL_STR
+ if (opt & (OPT_REPLSTR | OPT_REPLSTR1)) {
+ /*
+ * -I<str>:
+ * Unmodified args are kept in G.argv[i],
+ * G.args[i] receives malloced G.argv[i] with <str> replaced
+ * with input line. Setting this up:
+ */
+ G.args = NULL;
+ G.argv = argv;
+ argc = 0;
+ read_args = process_stdin_with_replace;
+ } else
+#endif
+ {
+ /* Allocate pointers for execvp.
+ * We can statically allocate (argc + n_max_arg + 1) elements
+ * and do not bother with resizing args[], but on 64-bit machines
+ * this results in args[] vector which is ~8 times bigger
+ * than n_max_chars! That is, with n_max_chars == 20k,
+ * args[] will take 160k (!), which will most likely be
+ * almost entirely unused.
+ *
+ * See store_param() for matching 256-step growth logic
+ */
+ G.args = xmalloc(sizeof(G.args[0]) * ((argc + 0xff) & ~0xff));
+ /* Store the command to be executed, part 1 */
+ for (i = 0; argv[i]; i++)
+ G.args[i] = argv[i];
+ }
while (1) {
char *rem;
diff --git a/include/libbb.h b/include/libbb.h
index 96f3334..1cbe2c8 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -650,6 +650,8 @@ char *xstrndup(const char *s, int n) FAST_FUNC RETURNS_MALLOC;
void overlapping_strcpy(char *dst, const char *src) FAST_FUNC;
char *safe_strncpy(char *dst, const char *src, size_t size) FAST_FUNC;
char *strncpy_IFNAMSIZ(char *dst, const char *src) FAST_FUNC;
+unsigned count_strstr(const char *str, const char *sub) FAST_FUNC;
+char *xmalloc_substitute_string(const char *src, int count, const char *sub, const char *repl) FAST_FUNC;
/* Guaranteed to NOT be a macro (smallest code). Saves nearly 2k on uclibc.
* But potentially slow, don't use in one-billion-times loops */
int bb_putchar(int ch) FAST_FUNC;
diff --git a/libbb/replace.c b/libbb/replace.c
new file mode 100644
index 0000000..8711f95
--- /dev/null
+++ b/libbb/replace.c
@@ -0,0 +1,45 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Utility routines.
+ *
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+//kbuild:lib-y += replace.o
+
+#include "libbb.h"
+
+unsigned FAST_FUNC count_strstr(const char *str, const char *sub)
+{
+ size_t sub_len = strlen(sub);
+ unsigned count = 0;
+
+ while ((str = strstr(str, sub)) != NULL) {
+ count++;
+ str += sub_len;
+ }
+ return count;
+}
+
+char* FAST_FUNC xmalloc_substitute_string(const char *src, int count, const char *sub, const char *repl)
+{
+ char *buf, *dst, *end;
+ size_t sub_len = strlen(sub);
+ size_t repl_len = strlen(repl);
+
+ //dbg_msg("subst(s:'%s',count:%d,sub:'%s',repl:'%s'", src, count, sub, repl);
+
+ buf = dst = xmalloc(strlen(src) + count * ((int)repl_len - (int)sub_len) + 1);
+ /* we replace each sub with repl */
+ while ((end = strstr(src, sub)) != NULL) {
+ dst = mempcpy(dst, src, end - src);
+ dst = mempcpy(dst, repl, repl_len);
+ /*src = end + 1; - GNU findutils 4.5.10 doesn't do this... */
+ src = end + sub_len; /* but this. Try "xargs -Iaa echo aaa" */
+ }
+ strcpy(dst, src);
+ //dbg_msg("subst9:'%s'", buf);
+ return buf;
+}