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authorGravatar Rob Landley <rob@landley.net>2006-09-05 03:22:19 +0000
committerGravatar Rob Landley <rob@landley.net>2006-09-05 03:22:19 +0000
commit02add9e53a248d6b1b0b62e1fdf126362d67f1bc (patch)
treee11c90e12d56264ded29c590b55c36a8d1850e8b
parent4d609cb5a3428c37203a1a8cb9a9276bb93db87a (diff)
downloadbusybox-02add9e53a24.tar.gz
busybox-02add9e53a24.tar.bz2
Might as well commit this to have the history. It's not linked in to the
applet list yet (and won't be until it can replace lash, I'm not having five shells in menuconfig at once), but you can build it with scripts/individual and mostly this is checked in so I can bloatcheck future versions against it easily.... This is about as small as a shell can get and still be a shell.
-rw-r--r--shell/bbsh.c73
1 files changed, 73 insertions, 0 deletions
diff --git a/shell/bbsh.c b/shell/bbsh.c
new file mode 100644
index 000000000..f2d76cc01
--- /dev/null
+++ b/shell/bbsh.c
@@ -0,0 +1,73 @@
+/* vi: set ts=4 :
+ *
+ * bbsh - busybox shell
+ *
+ * Copyright 2006 Rob Landley <rob@landley.net>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ */
+
+// Handle embedded NUL bytes in the command line.
+
+#include <busybox.h>
+
+static int handle(char *command)
+{
+ int argc=0;
+ char *argv[10], *start = command;
+
+ // Parse command into argv[]
+ for (;;) {
+ char *end;
+
+ // Skip leading whitespace and detect EOL.
+ while(isspace(*start)) start++;
+ if(!*start || *start=='#') break;
+
+ // Grab next word. (Add dequote and envvar logic here)
+ end=start;
+ while(*end && !isspace(*end)) end++;
+ argv[argc++]=xstrndup(start,end-start);
+ start=end;
+ }
+ argv[argc]=0;
+
+ if (!argc) return 0;
+ if (argc==2 && !strcmp(argv[0],"cd")) chdir(argv[1]);
+ else if(!strcmp(argv[0],"exit")) exit(argc>1 ? atoi(argv[1]) : 0);
+ else {
+ int status;
+ pid_t pid=fork();
+ if(!pid) {
+ run_applet_by_name(argv[0],argc,argv);
+ execvp(argv[0],argv);
+ printf("No %s",argv[0]);
+ exit(1);
+ } else waitpid(pid, &status, 0);
+ }
+ while(argc) free(argv[--argc]);
+
+ return 0;
+}
+
+int bbsh_main(int argc, char *argv[])
+{
+ char *command=NULL;
+ FILE *f;
+
+ bb_getopt_ulflags(argc, argv, "c:", &command);
+
+ f = argv[optind] ? xfopen(argv[optind],"r") : NULL;
+ if (command) handle(command);
+ else {
+ unsigned cmdlen=0;
+ for (;;) {
+ if(!f) putchar('$');
+ if(1 > getline(&command,&cmdlen,f ? : stdin)) break;
+ handle(command);
+ }
+ if (ENABLE_FEATURE_CLEAN_UP) free(command);
+ }
+
+ return 1;
+}