Extract usage information into a separate file.

[oweals/busybox.git] / loadkmap.c

diff --git a/loadkmap.c b/loadkmap.c
index eb5a5dd4a5b7f846f0b34af9215f62b6f83dbb05..488585f9c816bf99c12223a7850f81b015b70e32 100644 (file)
--- a/loadkmap.c
+++ b/loadkmap.c
@@ -1,68 +1,100 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * Mini loadkmap implementation for busybox
+ *
+ * Copyright (C) 1998 Enrique Zanardi <ezanardi@ull.es>
+ *
+ * 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
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
 #include "internal.h"
 #include <errno.h>
 #include <fcntl.h>
 #include <stdio.h>
-#include <linux/kd.h>
-#include <linux/keyboard.h>
 #include <sys/ioctl.h>
 
+/* From <linux/kd.h> */
+struct kbentry {
+       unsigned char kb_table;
+       unsigned char kb_index;
+       unsigned short kb_value;
+};
+#define KDSKBENT        0x4B47  /* sets one entry in translation table */
 
-const char                     loadkmap_usage[] = "loadkmap\n"
-"\n"
-"\tLoad a binary keyboard translation table from standard input.\n"
-"\n";
+/* From <linux/keyboard.h> */
+#define NR_KEYS         128
+#define MAX_NR_KEYMAPS  256
 
+int loadkmap_main(int argc, char **argv)
+{
+       struct kbentry ke;
+       u_short *ibuff;
+       int i, j, fd, readsz, pos, ibuffsz = NR_KEYS * sizeof(u_short);
+       char flags[MAX_NR_KEYMAPS], magic[] = "bkeymap", buff[7];
 
-int
-loadkmap_main(int argc, char * * argv)
-{ 
-    struct kbentry ke;
-    u_short *ibuff;
-    int i,j,fd,readsz,pos,ibuffsz=NR_KEYS * sizeof(u_short);
-    char flags[MAX_NR_KEYMAPS],magic[]="bkeymap",buff[7];
+       if (argc>=2 && *argv[1]=='-') {
+               usage(loadkmap_usage);
+       }
 
-    fd = open("/dev/tty0", O_RDWR);
-    if (fd < 0) {
-       fprintf(stderr, "Error opening /dev/tty0: %s\n", strerror(errno));
-       return 1;
-    }
+       fd = open("/dev/tty0", O_RDWR);
+       if (fd < 0) {
+               errorMsg("Error opening /dev/tty0: %s\n", strerror(errno));
+               exit(FALSE);
+       }
 
-    read(0,buff,7);
-    if (0 != strncmp(buff,magic,7)) {
-       fprintf(stderr, "This is not a valid binary keymap.\n");
-       return 1;
-    }
-   
-    if ( MAX_NR_KEYMAPS != read(0,flags,MAX_NR_KEYMAPS) ) {
-       fprintf(stderr, "Error reading keymap flags: %s\n", strerror(errno));
-       return 1;
-    }
+       read(0, buff, 7);
+       if (0 != strncmp(buff, magic, 7)) {
+               errorMsg("This is not a valid binary keymap.\n");
+               exit(FALSE);
+       }
 
-    ibuff=(u_short *) malloc(ibuffsz);
-    if (!ibuff) {
-       fprintf(stderr, "Out of memory.\n");
-       return 1;
-    }
+       if (MAX_NR_KEYMAPS != read(0, flags, MAX_NR_KEYMAPS)) {
+               errorMsg("Error reading keymap flags: %s\n",
+                               strerror(errno));
+               exit(FALSE);
+       }
+
+       ibuff = (u_short *) malloc(ibuffsz);
+       if (!ibuff) {
+               errorMsg("Out of memory.\n");
+               exit(FALSE);
+       }
 
-    for(i=0; i<MAX_NR_KEYMAPS; i++) {
-       if (flags[i]==1){
-           pos=0;
-           while (pos < ibuffsz) {
-               if ( (readsz = read(0,ibuff+pos,ibuffsz-pos)) < 0 ) {
-                   fprintf(stderr, "Error reading keymap: %s\n", 
-                       strerror(errno));
-                   return 1;
-               }
-               pos += readsz;
-           }
-           for(j=0; j<NR_KEYS; j++) {
-               ke.kb_index = j;
-               ke.kb_table = i;
-               ke.kb_value = ibuff[j];
-               ioctl(fd, KDSKBENT, &ke);
-           }
+       for (i = 0; i < MAX_NR_KEYMAPS; i++) {
+               if (flags[i] == 1) {
+                       pos = 0;
+                       while (pos < ibuffsz) {
+                               if ((readsz = read(0, (char *) ibuff + pos, ibuffsz - pos))
+                                       < 0) {
+                                       errorMsg("Error reading keymap: %s\n",
+                                                       strerror(errno));
+                                       exit(FALSE);
+                               }
+                               pos += readsz;
+                       }
+                       for (j = 0; j < NR_KEYS; j++) {
+                               ke.kb_index = j;
+                               ke.kb_table = i;
+                               ke.kb_value = ibuff[j];
+                               ioctl(fd, KDSKBENT, &ke);
+                       }
+               }
        }
-    }
-    close (fd);
-    return 0;
+       /* Don't bother to close files.  Exit does that 
+        * automagically, so we can save a few bytes */
+       /* close(fd); */
+       return(TRUE);
 }