2 * Copyright (c) 2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * 3. Neither the name of the Institute nor the names of its contributors
18 * may be used to endorse or promote products derived from this software
19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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43 #include <sys/types.h>
52 #define MAP_FAILED ((void *)-1)
56 doit_mmap(int fd, struct stat *sb)
61 mmap_buf = mmap(NULL, sb->st_size, PROT_READ, MAP_PRIVATE, fd, 0);
62 if (mmap_buf == (void *)MAP_FAILED)
64 ret = write(1, mmap_buf, sb->st_size);
65 if (ret != sb->st_size)
66 err(1, "write returned %d wanted to write %d", ret, (int)sb->st_size);
67 munmap(mmap_buf, sb->st_size);
72 doit_read(int fd, struct stat *sb)
77 read_buf = malloc(sb->st_size);
79 err(1, "malloc(%d)", (int)sb->st_size);
80 ret = read(fd, read_buf, sb->st_size);
81 if (ret != sb->st_size)
82 err(1, "read returned %d wanted to write %d", ret, (int)sb->st_size);
83 ret = write(1, read_buf, sb->st_size);
84 if (ret != sb->st_size)
85 err(1, "write returned %d wanted to write %d", ret, (int)sb->st_size);
90 doit(const char *filename, void (*func) (int, struct stat *))
96 fd = open(filename, O_RDONLY);
98 err(1, "open %s", filename);
102 err(1, "stat %s", filename);
106 static int read_flag;
107 static int mmap_flag;
108 static int help_flag;
113 fprintf(stderr, "mmap-cat [-m|-r] filename\n");
118 main(int argc, char **argv)
125 if (!strcmp(argv[1], "-m")) {
127 } else if (!strcmp(argv[1], "-r")) {
132 if (read_flag && mmap_flag)
133 errx(1, "can't do both mmap and read");
136 doit(argv[0], doit_read);
138 doit(argv[0], doit_mmap);