Add in telnet docs.

[oweals/busybox.git] / head.c

diff --git a/head.c b/head.c
index 930839de3bbc63665551aaf635f1f299983f2d37..f42f4837d323a6bddad94ea6cc6cd41a7a7675ea 100644 (file)
--- a/head.c
+++ b/head.c
@@ -1,9 +1,10 @@
+/* vi: set sw=4 ts=4: */
 /*
  * Mini head implementation for busybox
  *
  *
- * Copyright (C) 1999 by Lineo, inc.
- * Written by John Beppu <beppu@line.com>
+ * Copyright (C) 1999,2000 by Lineo, inc.
+ * Written by John Beppu <beppu@lineo.com>
  *
  * 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
@@ -26,81 +27,89 @@
 #include <stdio.h>
 
 const char head_usage[] =
-"Usage: head [OPTION]... [FILE]...\n"
-"Print first 10 lines of each FILE to standard output.\n"
-"With more than one FILE, precede each with a header giving the file name.\n"
-"With no FILE, or when FILE is -, read standard input.\n\n"
-"  -h  display this help and exit\n";
+       "head [OPTION] [FILE]...\n"
+#ifndef BB_FEATURE_TRIVIAL_HELP
+       "\nPrint first 10 lines of each FILE to standard output.\n"
+       "With more than one FILE, precede each with a header giving the\n"
+       "file name. With no FILE, or when FILE is -, read standard input.\n\n"
 
-int
-head(int len, FILE *src)
+       "Options:\n" "\t-n NUM\t\tPrint first NUM lines instead of first 10\n"
+#endif
+       ;
+
+int head(int len, FILE * src)
 {
-    int            i;
-    char    buffer[1024];
+       int i;
+       char buffer[1024];
 
-    for (i = 0; i < len; i++) {
-       fgets(buffer, 1024, src);
-       if (feof(src)) { break; }
-       fputs(buffer, stdout);
-    }
-    return 0;
+       for (i = 0; i < len; i++) {
+               fgets(buffer, 1024, src);
+               if (feof(src)) {
+                       break;
+               }
+               fputs(buffer, stdout);
+       }
+       return 0;
 }
 
 /* BusyBoxed head(1) */
-int
-head_main(int argc, char **argv)
+int head_main(int argc, char **argv)
 {
-    int            i = 1;
-    char    opt;
-    int            len = 10;
+       char opt;
+       int len = 10, tmplen, i;
+
+       /* parse argv[] */
+       for (i = 1; i < argc; i++) {
+               if (argv[i][0] == '-') {
+                       opt = argv[i][1];
+                       switch (opt) {
+                       case 'n':
+                               tmplen = 0;
+                               if (++i < argc)
+                                       tmplen = atoi(argv[i]);
+                               if (tmplen < 1)
+                                       usage(head_usage);
+                               len = tmplen;
+                               break;
+                       case '-':
+                       case 'h':
+                               usage(head_usage);
+                       default:
+                               fprintf(stderr, "head: invalid option -- %c\n", opt);
+                               usage(head_usage);
+                       }
+               } else {
+                       break;
+               }
+       }
 
-    /* 1st option is potentially special */
-    if ((argv[1][0] == '-') && isDecimal(argv[1][1])) {
-       int tmplen = atoi(&argv[1][1]);
-       if (tmplen) { len = tmplen; }
-       i = 2;
-    }
+       /* get rest of argv[] or stdin if nothing's left */
+       if (i >= argc) {
+               head(len, stdin);
 
-    /* parse argv[] */
-    for ( ; i < argc; i++) {
-       if (argv[i][0] == '-') {
-           opt = argv[i][1];
-           switch (opt) {
-               case 'h':
-                   usage(head_usage);
-               default:
-                   fprintf(stderr, "head: invalid option -- %c\n", opt);
-                   usage(head_usage);
-           }
        } else {
-           break;
-       }
-    }
+               int need_headers = ((argc - i) > 1);
 
-    /* get rest of argv[] or stdin if nothing's left */
-    if (i >= argc) {
-       head(len, stdin);
+               for (; i < argc; i++) {
+                       FILE *src;
 
-    } else {
-       int need_headers = ((argc - i) > 1);
-       for ( ; i < argc; i++) {
-           FILE *src;
-           src = fopen(argv[i], "r");
-           if (!src) {
-               fprintf(stderr,"head: %s: %s\n", argv[i], strerror(errno));
-           } else {
-               /* emulating GNU behaviour */
-               if (need_headers) { 
-                   fprintf(stdout, "==> %s <==\n", argv[i]);
-               }
-               head(len, src);
-               if (i < argc - 1) {
-                   fprintf(stdout, "\n");
+                       src = fopen(argv[i], "r");
+                       if (!src) {
+                               fprintf(stderr, "head: %s: %s\n", argv[i],
+                                               strerror(errno));
+                       } else {
+                               /* emulating GNU behaviour */
+                               if (need_headers) {
+                                       fprintf(stdout, "==> %s <==\n", argv[i]);
+                               }
+                               head(len, src);
+                               if (i < argc - 1) {
+                                       fprintf(stdout, "\n");
+                               }
+                       }
                }
-           }
        }
-    }
-    exit(0);
+       return(0);
 }
 
-/* $Id: head.c,v 1.1 1999/12/10 07:42:50 beppu Exp $ */
+/* $Id: head.c,v 1.11 2000/06/19 17:25:39 andersen Exp $ */