From 6f068904dc142657bb596f91196f9113f1838cbe Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Thu, 27 Feb 2014 11:17:06 +0100 Subject: 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 --- findutils/xargs.c | 153 ++++++++++++++++++++++++++++++++++++++++++++---------- 1 file changed, 127 insertions(+), 26 deletions(-) (limited to 'findutils/xargs.c') diff --git a/findutils/xargs.c b/findutils/xargs.c index 0d1bb43fc..ed6dbd33e 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 was specified. + * In this mode, words aren't appended to PROG ARGS. + * Instead, entire input line is read, then 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: + * Unmodified args are kept in G.argv[i], + * G.args[i] receives malloced G.argv[i] with 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; -- cgit v1.2.3