new -t option for putting tab before filename

[chiark-utils.git] / cprogs / rwbuffer.c

diff --git a/cprogs/rwbuffer.c b/cprogs/rwbuffer.c
index f2ec48da0e5a00086b8884e8e1afc0de36f8d6d7..10b86ca0d1ec8e2d268ab9fe68aef1e2465cef54 100644 (file)
--- a/cprogs/rwbuffer.c
+++ b/cprogs/rwbuffer.c
@@ -39,7 +39,7 @@
 
 unsigned char *buf, *wp, *rp;
 int used, seeneof, maxselfd;
-size_t buffersize;
+size_t buffersize= RWBUFFER_SIZE_MB_DEF*1024*1024;
 fd_set readfds;
 fd_set writefds;
 
@@ -84,7 +84,7 @@ void startupcore(void) {
 void startup(const char *const *argv) {
   const char *arg;
   char *ep;
-  unsigned long opt_buffersize=RWBUFFER_SIZE_MB_DEF;
+  int shift=-1;
   
   assert(argv[0]);
   
@@ -92,15 +92,22 @@ void startup(const char *const *argv) {
     if (!strcmp(arg,"--mlock")) {
       opt_mlock= 1;
     } else if (isdigit((unsigned char)arg[0])) {
-      opt_buffersize= strtoul(arg,&ep,0);
-      if (opt_buffersize > RWBUFFER_SIZE_MB_MAX)
+      buffersize= strtoul(arg,&ep,0);
+      if (ep[0] && ep[1]) usageerr("buffer size spec. invalid");
+      switch (ep[0]) {
+      case 0: case 'm':  shift= 20;  break;
+      case 'k':          shift= 10;  break;
+      case 'b':          shift= 0;   break;
+      default: usageerr("buffer size unit unknown");
+      }
+      if (buffersize > ((RWBUFFER_SIZE_MB_MAX << 20) >> shift))
        usageerr("buffer size too big");
+      buffersize <<= shift;
     } else {
       usageerr("invalid option");
     }
   }
 
-  buffersize= opt_buffersize*1024*1024;
   startupcore();
   nonblock(0,1); nonblock(1,1);
 }