Improved port of ifconfig... smaller and with more features.

[oweals/busybox.git] / sh.c

diff --git a/sh.c b/sh.c
index 874c0aca90fccc251669307abac1864ca6acf567..65a0a25d242f7aa371992d7e9a5901a1de232840 100644 (file)
--- a/sh.c
+++ b/sh.c
@@ -959,15 +959,29 @@ static int expand_arguments(char *command)
                                        else
                                                var = itoa(last_bg_pid);
                                        break;
-#if 0
-                               /* Everything else like $$, $#, $[0-9], etcshould all be 
-                                * expanded by wordexp(), so we can skip that stuff here */
+                               /* Everything else like $$, $#, $[0-9], etc should all be
+                                * expanded by wordexp(), so we can in theory skip that stuff
+                                * here, but just to be on the safe side (i.e. since uClibc
+                                * wordexp doesn't do this stuff yet), lets leave it in for
+                                * now. */
                                case '$':
+                                       var = itoa(getpid());
+                                       break;
                                case '#':
+                                       var = itoa(argc-1);
+                                       break;
                                case '0':case '1':case '2':case '3':case '4':
                                case '5':case '6':case '7':case '8':case '9':
+                                       {
+                                               int index=*(dst + 1)-48;
+                                               if (index >= argc) {
+                                                       var='\0';
+                                               } else {
+                                                       var = argv[index];
+                                               }
+                                       }
                                        break;
-#endif 
+
                        }
                }
                if (var) {
@@ -982,9 +996,17 @@ static int expand_arguments(char *command)
                        memmove(dst+subst_len, next_dst+1, subst_len); 
                        /* Now copy in the new stuff */
                        strncpy(dst, var, subst_len);
+                       src = dst;
+                       src++;
+               } else {
+                       /* Seems we got an un-expandable variable.  So delete it. */
+                       char *next_dst;
+                       if ((next_dst=strpbrk(dst+1, " \t~`!$^&*()=|\\{}[];\"'<>?")) != NULL) {
+                               /* Move stuff to the end of the string to accommodate filling 
+                                * the created gap with the new stuff */
+                               memmove(dst, next_dst,  next_dst-dst); 
+                       }
                }
-               src = dst;
-               src++;
        }