usr/src/cmd/echo/echo.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright (c) 1989, 2010, Oracle and/or its affiliates. All rights reserved.
  23  */
  24
  25 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  26 /*        All Rights Reserved   */
  27
  28
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <wchar.h>
  32 #include <string.h>
  33 #include <locale.h>
  34
  35 int
  36 main(int argc, char *argv[])
  37 {
  38
  39         register char   *cp;
  40         register int    i, wd;
  41         int     j;
  42         wchar_t         wc;
  43         int             b_len;
  44         char            *ep;
  45
  46         (void) setlocale(LC_ALL, "");
  47
  48         if (--argc == 0) {
  49                 (void) putchar('\n');
  50                 if (fflush(stdout) != 0)
  51                         return (1);
  52                 return (0);
  53         }
  54
  55         for (i = 1; i <= argc; i++) {
  56                 for (cp = argv[i], ep = cp + (int)strlen(cp);
  57                     cp < ep; cp += b_len) {
  58                 if ((b_len = mbtowc(&wc, cp, MB_CUR_MAX)) <= 0) {
  59                         (void) putchar(*cp);
  60                         b_len = 1;
  61                         continue;
  62                 }
  63
  64                 if (wc != '\\') {
  65                         (void) putwchar(wc);
  66                         continue;
  67                 }
  68
  69                         cp += b_len;
  70                         b_len = 1;
  71                         switch (*cp) {
  72                                 case 'a':       /* alert - XCU4 */
  73                                         (void) putchar('\a');
  74                                         continue;
  75
  76                                 case 'b':
  77                                         (void) putchar('\b');
  78                                         continue;
  79
  80                                 case 'c':
  81                                         if (fflush(stdout) != 0)
  82                                                 return (1);
  83                                         return (0);
  84
  85                                 case 'f':
  86                                         (void) putchar('\f');
  87                                         continue;
  88
  89                                 case 'n':
  90                                         (void) putchar('\n');
  91                                         continue;
  92
  93                                 case 'r':
  94                                         (void) putchar('\r');
  95                                         continue;
  96
  97                                 case 't':
  98                                         (void) putchar('\t');
  99                                         continue;
 100
 101                                 case 'v':
 102                                         (void) putchar('\v');
 103                                         continue;
 104
 105                                 case '\\':
 106                                         (void) putchar('\\');
 107                                         continue;
 108                                 case '0':
 109                                         j = wd = 0;
 110                                         while ((*++cp >= '0' && *cp <= '7') &&
 111                                             j++ < 3) {
 112                                                 wd <<= 3;
 113                                                 wd |= (*cp - '0');
 114                                         }
 115                                         (void) putchar(wd);
 116                                         --cp;
 117                                         continue;
 118
 119                                 default:
 120                                         cp--;
 121                                         (void) putchar(*cp);
 122                         }
 123                 }
 124                 (void) putchar(i == argc? '\n': ' ');
 125                 if (fflush(stdout) != 0)
 126                         return (1);
 127         }
 128         return (0);
 129 }