Annotation of prex/usr/bin/cat/cat.c, Revision 1.1
1.1 ! nbrk 1: /*
! 2: * Copyright (c) 1989, 1993
! 3: * The Regents of the University of California. All rights reserved.
! 4: *
! 5: * This code is derived from software contributed to Berkeley by
! 6: * Kevin Fall.
! 7: *
! 8: * Redistribution and use in source and binary forms, with or without
! 9: * modification, are permitted provided that the following conditions
! 10: * are met:
! 11: * 1. Redistributions of source code must retain the above copyright
! 12: * 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.
! 16: * 3. Neither the name of the University nor the names of its contributors
! 17: * may be used to endorse or promote products derived from this software
! 18: * without specific prior written permission.
! 19: *
! 20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 30: * SUCH DAMAGE.
! 31: */
! 32:
! 33: #include <sys/stat.h>
! 34: #include <sys/fcntl.h>
! 35:
! 36: #include <err.h>
! 37: #include <unistd.h>
! 38: #include <errno.h>
! 39: #include <stdio.h>
! 40: #include <stdlib.h>
! 41: #include <string.h>
! 42:
! 43: #ifdef CMDBOX
! 44: #define main(argc, argv) cat_main(argc, argv)
! 45: #endif
! 46:
! 47: static void raw_cat(int rfd);
! 48:
! 49: static char stdbuf[BUFSIZ];
! 50: static char *filename;
! 51: static int rval;
! 52:
! 53: int
! 54: main(int argc, char *argv[])
! 55: {
! 56: int ch, fd;
! 57:
! 58: while ((ch = getopt(argc, argv, "u")) != -1)
! 59: switch(ch) {
! 60: case 'u':
! 61: setbuf(stdout, NULL);
! 62: break;
! 63: case '?':
! 64: default:
! 65: fprintf(stderr, "usage: cat [-u] [-] [file ...]\n");
! 66: exit(1);
! 67: /* NOTREACHED */
! 68: }
! 69: argv += optind;
! 70:
! 71: fd = fileno(stdin);
! 72: filename = "stdin";
! 73: do {
! 74: if (*argv) {
! 75: if (!strcmp(*argv, "-"))
! 76: fd = fileno(stdin);
! 77: else if ((fd = open(*argv, O_RDONLY, 0)) < 0) {
! 78: warn("%s", *argv);
! 79: ++argv;
! 80: rval = 1;
! 81: continue;
! 82: }
! 83: filename = *argv++;
! 84: }
! 85: raw_cat(fd);
! 86: if (fd != fileno(stdin))
! 87: (void)close(fd);
! 88: } while (*argv);
! 89: exit(rval);
! 90: }
! 91:
! 92: static void
! 93: raw_cat(int rfd)
! 94: {
! 95: int nr, nw, off, wfd;
! 96: struct stat sbuf;
! 97:
! 98: wfd = fileno(stdout);
! 99: if (fstat(wfd, &sbuf))
! 100: err(1, "%s", filename);
! 101: while ((nr = read(rfd, stdbuf, BUFSIZ)) > 0)
! 102: for (off = 0; nr; nr -= nw, off += nw)
! 103: if ((nw = write(wfd, stdbuf + off, (size_t)nr)) < 0)
! 104: err(1, "stdout");
! 105: if (nr < 0) {
! 106: warn("%s", filename);
! 107: rval = 1;
! 108: }
! 109: }
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