diff options
Diffstat (limited to 'findutils/xargs.c')
| -rw-r--r-- | findutils/xargs.c | 129 |
1 files changed, 115 insertions, 14 deletions
diff --git a/findutils/xargs.c b/findutils/xargs.c index 298c000..27f8335 100644 --- a/findutils/xargs.c +++ b/findutils/xargs.c @@ -3,6 +3,7 @@ * Only "-prt" options are supported in this version of xargs. * * (C) 2002 by Vladimir Oleynik <dzo@simtreas.ru> + * (C) 2003 by Glenn McGrath <bug1@optushome.com.au> * * Special thanks Mark Whitley for stimul to rewrote :) * @@ -20,12 +21,28 @@ * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA * - * BUGS: -p doesnt accept user input + * + * Reference: + * http://www.opengroup.org/onlinepubs/007904975/utilities/xargs.html + * + * + * BUGS: + * p option doesnt accept user input, should read input from /dev/tty + * + * E option doesnt allow spaces before argument + * + * xargs should terminate if an invocation of a constructed command line + * returns an exit status of 255. + * + * exit value of isnt correct + * + * doesnt print quoted string properly * */ #include <stdio.h> #include <stdlib.h> +#include <string.h> #include <unistd.h> #include <getopt.h> #include <errno.h> @@ -33,7 +50,6 @@ #include <sys/wait.h> #include "busybox.h" - /* This function have special algorithm. Don`t use fork and include to main! @@ -65,17 +81,42 @@ static void xargs_exec(char * const * args) #define OPT_VERBOSE 0x2 #define OPT_INTERACTIVE 0x4 -#define OPT_NO_EMPTY 0x8 +#define OPT_TERMINATE 0x8 +#define OPT_UPTO_NUMBER 0x10 +#define OPT_UPTO_SIZE 0x20 +#define OPT_EOF_STRING 0x40 int xargs_main(int argc, char **argv) { - char *file_to_act_on; - char **args; - int i, a; + char *s_max_args = NULL; + char *s_line_size = NULL; unsigned long flg; + char *eof_string = "_"; + int line_size = LINE_MAX; + unsigned int max_args = LINE_MAX / 2; + + char *line_buffer = NULL; + char *line_buffer_ptr_ptr; + char *old_arg = NULL; + + char **args; + char *args_entry_ptr; + + int i; + int a; + + bb_opt_complementaly = "pt"; - flg = bb_getopt_ulflags(argc, argv, "+tpr"); + + flg = bb_getopt_ulflags(argc, argv, "+tpxn:s:E::", &s_max_args, &s_line_size, &eof_string); + + if (s_max_args) { + max_args = bb_xgetularg10(s_max_args); + } + if (s_line_size) { + line_size = bb_xgetularg10(s_line_size); + } a = argc - optind; argv += optind; @@ -88,20 +129,81 @@ int xargs_main(int argc, char **argv) args = xcalloc(a + 2, sizeof(char *)); /* Store the command to be executed (taken from the command line) */ - for (i = 0; i < a; i++) + for (i = 0; i < a; i++) { + line_size -= strlen(*argv) + 1; args[i] = *argv++; + } + if (line_size < 1) { + bb_error_msg_and_die("can not fit single argument within argument list size limit"); + } + + args[i] = xmalloc(line_size); + args_entry_ptr = args[i]; /* Now, read in one line at a time from stdin, and store this * line to be used later as an argument to the command */ - while ((file_to_act_on = bb_get_chomped_line_from_file(stdin)) != NULL) { - if(file_to_act_on[0] != 0 || (flg & OPT_NO_EMPTY) == 0) { - args[a] = file_to_act_on[0] ? file_to_act_on : NULL; + do { + char *line_buffer_ptr = NULL; + unsigned int arg_count = 0; + unsigned int arg_size = 0; + + *args_entry_ptr = '\0'; + + /* Get the required number of entries from stdin */ + do { + /* (Re)fill the line buffer */ + if (line_buffer == NULL) { + line_buffer = bb_get_chomped_line_from_file(stdin); + if (line_buffer == NULL) { + /* EOF, exit outer loop */ + break; + } + line_buffer_ptr = strtok_r(line_buffer, " \t", &line_buffer_ptr_ptr); + } else { + if (old_arg) { + line_buffer_ptr = old_arg; + old_arg = NULL; + } else { + line_buffer_ptr = strtok_r(NULL, " \t", &line_buffer_ptr_ptr); + } + } + /* If no arguments left go back and get another line */ + if (line_buffer_ptr == NULL) { + free(line_buffer); + line_buffer = NULL; + continue; + } + + if (eof_string && (strcmp(line_buffer_ptr, eof_string) == 0)) { + /* logical EOF, exit outer loop */ + line_buffer = NULL; + break; + } + + /* Check the next argument will fit */ + arg_size += 1 + strlen(line_buffer_ptr); + if (arg_size > line_size) { + if ((arg_count == 0) || ((flg & OPT_TERMINATE) && (arg_count != max_args))){ + bb_error_msg_and_die("argument line too long"); + } + old_arg = line_buffer_ptr; + break; + } + + /* Add the entry to our pre-allocated space */ + strcat(args_entry_ptr, line_buffer_ptr); + strcat(args_entry_ptr, " "); + arg_count++; + } while (arg_count < max_args); + + if (*args_entry_ptr != '\0') { if(flg & (OPT_VERBOSE | OPT_INTERACTIVE)) { for(i=0; args[i]; i++) { if(i) fputc(' ', stderr); fputs(args[i], stderr); } + fputs(((flg & OPT_INTERACTIVE) ? " ?..." : "\n"), stderr); } @@ -109,9 +211,8 @@ int xargs_main(int argc, char **argv) xargs_exec(args); } } - /* clean up */ - free(file_to_act_on); - } + } while (line_buffer); + #ifdef CONFIG_FEATURE_CLEAN_UP free(args); #endif |