[hackers] [sbase] xargs: implement -n || Hiltjo Posthuma

[git]

commit 1be58188ad3487e07f72c0190eb4775c52beced5
Author: Hiltjo Posthuma <hil...@codemadness.org>
Date:   Wed Apr 9 17:35:29 2014 +0200

    xargs: implement -n
    
    Signed-off-by: Hiltjo Posthuma <hil...@codemadness.org>

diff --git a/xargs.c b/xargs.c
index 8e6ba61..564eee8 100644
--- a/xargs.c
+++ b/xargs.c
@@ -26,14 +26,15 @@ static char *cmd[NARGS];
 static char *argb;
 static size_t argbsz;
 static size_t argbpos;
+static long maxargs = 0;
 static int nerrors = 0;
 static char *eofstr;
-static int rflag = 0;
+static int rflag = 0, nflag = 0;
 
 static void
 usage(void)
 {
-       eprintf("usage: %s [-r] [-E eofstr] [cmd [arg...]]
", argv0);
+       eprintf("usage: %s [n maxargs] [-r] [-E eofstr] [cmd [arg...]]
", argv0);
 }
 
 int
@@ -42,9 +43,14 @@ main(int argc, char *argv[])
        int leftover;
        long argsz, argmaxsz;
        char *arg;
-       int i;
+       int i, a;
 
        ARGBEGIN {
+       case 'n':
+               nflag = 1;
+               if((maxargs = strtol(EARGF(usage()), NULL, 10)) <= 0)
+                       eprintf("%s: value for -n option should be >= 1
", argv0);
+               break;
        case 'r':
                rflag = 1;
                break;
@@ -63,7 +69,7 @@ main(int argc, char *argv[])
 
        leftover = 0;
        do {
-               argsz = 0; i = 0;
+               argsz = 0; i = 0; a = 0;
                if (argc > 0) {
                        for (; i < argc; i++) {
                                cmd[i] = strdup(argv[i]);
@@ -85,10 +91,18 @@ main(int argc, char *argv[])
                        cmd[i] = strdup(arg);
                        argsz += strlen(cmd[i]) + 1;
                        i++;
+                       a++;
                        leftover = 0;
+                       if(nflag == 1 && a >= maxargs)
+                               break;
                }
                cmd[i] = NULL;
-               if (i == 1 && rflag == 1); else spawn();
+               if(a >= maxargs && nflag == 1)
+                       spawn();
+               else if(!a || (i == 1 && rflag == 1))
+                       ;
+               else
+                       spawn();
                for (; i >= 0; i--)
                        free(cmd[i]);
        } while (arg);