WebSVN – HelenOS – Diff – /trunk/uspace/app/bdsh/cmds/modules/cat/cat.c

-/* Automatically generated by mknewcmd on Wed Aug 13 15:41:09 PHT 2008
- * This is machine generated output. The author of mknewcmd claims no
- * copyright over the contents of this file. Where legally permitted, the
+/* Copyright (c) 2008, Tim Post <tinkertim@gmail.com>
- * contents herein are donated to the public domain.
+ * All rights reserved.
+ *
- * You should apply any license and copyright that you wish to this file,
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of the original program's authors nor the names of its
+ * contributors may be used to endorse or promote products derived from this
- * replacing this header in its entirety. */
+ * software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
 #include <stdio.h>
 #include <stdlib.h>
+#include <unistd.h>
 #include <getopt.h>
+#include <string.h>
+#include <fcntl.h>
 #include "config.h"
 #include "util.h"
 #include "errors.h"
 #include "entry.h"
 #include "cat.h"
 #include "cmds.h"
 static char *cmdname = "cat";
+#define CAT_VERSION "0.0.1"
+#define CAT_DEFAULT_BUFLEN 1024
+static char *cat_oops = "That option is not yet supported\n";
 static struct option long_options[] = {
-    { "help",       no_argument,        0,  'h' },
+    { "help", no_argument, 0, 'h' },
-    { "version",    no_argument,        0,  'v' },
+    { "version", no_argument, 0, 'v' },
+    { "head", required_argument, 0, 'H' },
-    { "file",       required_argument,  0,  'f' },
+    { "tail", required_argument, 0, 't' },
+    { "buffer", required_argument, 0, 'b' },
+    { "more", no_argument, 0, 'm' },
     { 0, 0, 0, 0 }
 };
 /* Dispays help for cat in various levels */
 void * help_cmd_cat(unsigned int level)
+{
+    if (level == HELP_SHORT) {
-    printf("This is the %s help for '%s'.\n",
+        printf("`%s' shows the contents of files\n", cmdname);
+    } else {
-        level ? EXT_HELP : SHORT_HELP, cmdname);
+        help_cmd_cat(HELP_SHORT);
+        printf(
+        "Usage:  %s [options] <file1> [file2] [...]\n"
+        "Options:\n"
+        "  -h, --help       A short option summary\n"
+        "  -v, --version    Print version information and exit\n"
+        "  -H, --head ##    Print only the first ## bytes\n"
+        "  -t, --tail ##    Print only the last ## bytes\n"
+        "  -b, --buffer ##  Set the read buffer size to ##\n"
+        "  -m, --more       Pause after each screen full\n"
+        "Currently, %s is under development, some options don't work.\n",
+        cmdname, cmdname);
+    }
     return CMD_VOID;
+}
+unsigned int cat_file(const char *fname, size_t blen)
+{
+    int fd, bytes = 0, count = 0, reads = 0;
+    off_t total = 0;
+    char *buff = NULL;
+    if (-1 == (fd = open(fname, O_RDONLY))) {
+        printf("Unable to open %s\n", fname);
+        return 1;
+    }
+    total = lseek(fd, 0, SEEK_END);
+    lseek(fd, 0, SEEK_SET);
+    if (NULL == (buff = (char *) malloc(blen + 1))) {
+        close(fd);
+        printf("Unable to allocate enough memory to read %s\n",
+            fname);
+        return 1;
+    }
+    do {
+        memset(buff, 0, sizeof(buff));
+        bytes = read(fd, buff, blen);
+        if (bytes > 0) {
+            count += bytes;
+            if (bytes < blen)
+                buff[bytes] = '\0';
+            printf(buff);
+            reads++;
+        }
+    } while (bytes > 0);
+    close(fd);
+    if (bytes == -1) {
+        printf("Error reading %s\n", fname);
+        free(buff);
+        return 1;
+    }
+    /* Debug stuff, newline not added purposefully */
+    printf("** %s is a file with the size of %ld bytes\n",
+        fname, total);
+    printf( "** %d bytes were read in a buffer of %d bytes in %d reads\n",
+        count, blen, reads);
+    printf("** Read %s\n", count == total ? "Succeeded" : "Failed");
+    free(buff);
+    return 0;
+}
 /* Main entry point for cat, accepts an array of arguments */
 int * cmd_cat(char **argv)
+{
-    unsigned int argc;
+    unsigned int argc, i, ret = 0, buffer = 0;
-    unsigned int i;
     int c, opt_ind;
-    /* Count the arguments */
     for (argc = 0; argv[argc] != NULL; argc ++);
-    printf("%s %s\n", TEST_ANNOUNCE, cmdname);
-    printf("%d arguments passed to %s\n", argc - 1, cmdname);
-    for (i = 1; i < argc; i++)
-        printf("[%d] -> %s\n", i, argv[i]);
     for (c = 0, optind = 0, opt_ind = 0; c != -1;) {
-        c = getopt_long(argc, argv, "f:hv", long_options, &opt_ind);
+        c = getopt_long(argc, argv, "hvmH:t:b:", long_options, &opt_ind);
         switch (c) {
         case 'h':
-            help_cmd_cat(HELP_SHORT);
+            help_cmd_cat(HELP_LONG);
-            break;
+            return CMD_SUCCESS;
         case 'v':
-            printf("I have no version, sorry.\n");
+            printf("%s\n", CAT_VERSION);
+            return CMD_SUCCESS;
-            break;
+        case 'H':
+            printf(cat_oops);
+            return CMD_FAILURE;
+        case 't':
+            printf(cat_oops);
+            return CMD_FAILURE;
-        case 'f':
+        case 'b':
-            printf("File : %s\n", optarg);
+            printf(cat_oops);
             break;
+        case 'm':
+            printf(cat_oops);
+            return CMD_FAILURE;
+        }
+    }
+    argc -= optind;
+    if (argc < 1) {
-    printf("argc = %d, optind = %d\n", argc, optind);
+        printf("%s - incorrect number of arguments. Try `%s --help'\n",
+            cmdname, cmdname);
+        return CMD_FAILURE;
+    }
+    i = optind;
+    if (buffer <= 0)
+        buffer = CAT_DEFAULT_BUFLEN;
+    for (i = optind; argv[i] != NULL; i++)
+        ret += cat_file(argv[i], buffer);
+    if (ret)
+        return CMD_FAILURE;
+    else
-    return CMD_SUCCESS;
+        return CMD_SUCCESS;
+}

Subversion Repositories HelenOS

(root)/trunk/uspace/app/bdsh/cmds/modules/cat/cat.c – Rev 3346 → 3356