diff options
Diffstat (limited to 'findutils')
| -rw-r--r-- | findutils/xargs.c | 173 |
1 files changed, 61 insertions, 112 deletions
diff --git a/findutils/xargs.c b/findutils/xargs.c index 433567b..c5f7b20 100644 --- a/findutils/xargs.c +++ b/findutils/xargs.c @@ -1,9 +1,9 @@ -/* vi: set sw=4 ts=4: */ /* * Mini xargs implementation for busybox * * Copyright (C) 2000 by Lineo, inc. * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.org> + * Remixed by Mark Whitley <markw@lineo.com>, <markw@enol.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -22,138 +22,87 @@ */ #include "busybox.h" -#include <stdlib.h> #include <stdio.h> +#include <stdlib.h> #include <string.h> -#include <errno.h> -#include <getopt.h> -#include <ctype.h> -#include <sys/types.h> -#include <sys/wait.h> - int xargs_main(int argc, char **argv) { - char *in_from_stdin = NULL; - char *args = NULL; char *cmd_to_be_executed = NULL; - char traceflag = 0; - int len_args=0, len_cmd_to_be_executed, opt; - pid_t pid; - int wpid, status; - - /* Note that we do not use getopt here, since - * we only want to interpret initial options, - * not options passed to commands */ - while (--argc && **(++argv) == '-') { - while (*++(*argv)) { - switch (**argv) { - case 't': - traceflag=1; - break; - default: - fatalError(xargs_usage); - } - } - } + char *file_to_act_on = NULL; + + /* + * No options are supported in this version of xargs; no getopt. + * + * Re: The missing -t flag: Most programs that produce output also print + * the filename, so xargs doesn't really need to do it again. Supporting + * the -t flag =greatly= bloats up the size of this app and the memory it + * uses because you have to buffer all the input file strings in memory. If + * you really want to see the filenames that xargs will act on, just run it + * once with no args and xargs will echo the filename. Simple. + */ /* Store the command to be executed (taken from the command line) */ - if (argc == 0) { - len_cmd_to_be_executed=6; - cmd_to_be_executed = xmalloc(len_cmd_to_be_executed); - strcat(cmd_to_be_executed, "echo"); + if (argc == 1) { + /* default behavior is to echo all the filenames */ + cmd_to_be_executed = strdup("/bin/echo "); } else { - opt=strlen(*argv); - len_cmd_to_be_executed = (opt > 10)? opt : 10; - cmd_to_be_executed = xcalloc(len_cmd_to_be_executed, sizeof(char)); - strcat(cmd_to_be_executed, *argv); + /* concatenate all the arguments passed to xargs together */ + int i; + int len = 1; /* for the '\0' */ + for (i = 1; i < argc; i++) { + len += strlen(argv[i]); + len += 1; /* for the space between the args */ + cmd_to_be_executed = xrealloc(cmd_to_be_executed, len); + strcat(cmd_to_be_executed, argv[i]); + strcat(cmd_to_be_executed, " "); + } } - //args=xrealloc(args, len_args); -// strcpy(args, " "); - /* Now, read in one line at a time from stdin, and store this * line to be used later as an argument to the command */ - in_from_stdin = get_line_from_file(stdin); - for (;in_from_stdin!=NULL;) { - char *tmp; - opt = strlen(in_from_stdin); - len_args += opt + 3; - args=xrealloc(args, len_args); - - /* Strip out the final \n */ - in_from_stdin[opt-1]=' '; - - /* Replace any tabs with spaces */ - while( (tmp = strchr(in_from_stdin, '\t')) != NULL ) - *tmp=' '; - - /* Strip out any extra intra-word spaces */ - while( (tmp = strstr(in_from_stdin, " ")) != NULL ) { - opt = strlen(in_from_stdin); - memmove(tmp, tmp+1, opt-(tmp-in_from_stdin)); + while ((file_to_act_on = get_line_from_file(stdin)) !=NULL) { + + FILE *cmd_output = NULL; + char *output_line = NULL; + char *execstr = NULL; + + /* eat the newline off the filename. */ + if (file_to_act_on[strlen(file_to_act_on)-1] == '\n') + file_to_act_on[strlen(file_to_act_on)-1] = '\0'; + + /* eat blank lines */ + if (strlen(file_to_act_on) == 0) + continue; + + /* assemble the command and execute it */ + execstr = xcalloc(strlen(cmd_to_be_executed) + + strlen(file_to_act_on) + 1, sizeof(char)); + strcat(execstr, cmd_to_be_executed); + strcat(execstr, file_to_act_on); + cmd_output = popen(execstr, "r"); + if (cmd_output == NULL) { + perror("popen"); + exit(1); } - /* trim trailing whitespace */ - opt = strlen(in_from_stdin) - 1; - while (isspace(in_from_stdin[opt])) - opt--; - in_from_stdin[++opt] = 0; - - /* Strip out any leading whitespace */ - tmp=in_from_stdin; - while(isspace(*tmp)) - tmp++; - - strcat(args, tmp); - strcat(args, " "); - - free(in_from_stdin); - in_from_stdin = get_line_from_file(stdin); - } - - if ((pid = fork()) == 0) { - char *cmd[255]; - int i=1; - - if (traceflag==1) { - fprintf(stderr, "%s ", cmd_to_be_executed); + /* harvest the output */ + while ((output_line = get_line_from_file(cmd_output)) != NULL) { + fputs(output_line, stdout); + free(output_line); } - cmd[0] = cmd_to_be_executed; - while (--argc && ++argv && *argv ) { - if (traceflag==1) { - fprintf(stderr, "%s ", *argv); - } - cmd[i++]=*argv; - } - if (traceflag==1) { - fprintf(stderr, "%s\n", args); - } - cmd[i++] = args; - cmd[i] = NULL; - execvp(cmd_to_be_executed, cmd); - /* What? Still here? Exit with an error */ - fatalError("%s: %s\n", cmd_to_be_executed, strerror(errno)); + /* clean up */ + pclose(cmd_output); + free(execstr); + free(file_to_act_on); } - /* Wait for a child process to exit */ - wpid = wait(&status); - #ifdef BB_FEATURE_CLEAN_UP - free(args); free(cmd_to_be_executed); #endif - if (wpid > 0) - return (WEXITSTATUS(status)); - else - return EXIT_FAILURE; + return 0; } -/* -Local Variables: -c-file-style: "linux" -c-basic-offset: 4 -tab-width: 4 -End: -*/ + +/* vi: set sw=4 ts=4: */ |