1 /*- 2 * Copyright (c) 1991, 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 * Kenneth Almquist. 7 * 8 * %sccs.include.redist.c% 9 * 10 * @(#)echo.c 8.1 (Berkeley) 05/31/93 11 */ 12 13 /* 14 * Echo command. 15 */ 16 17 #define main echocmd 18 19 #include "bltin.h" 20 21 /* #define eflag 1 */ 22 23 main(argc, argv) char **argv; { 24 register char **ap; 25 register char *p; 26 register char c; 27 int count; 28 int nflag = 0; 29 #ifndef eflag 30 int eflag = 0; 31 #endif 32 33 ap = argv; 34 if (argc) 35 ap++; 36 if ((p = *ap) != NULL) { 37 if (equal(p, "-n")) { 38 nflag++; 39 ap++; 40 } else if (equal(p, "-e")) { 41 #ifndef eflag 42 eflag++; 43 #endif 44 ap++; 45 } 46 } 47 while ((p = *ap++) != NULL) { 48 while ((c = *p++) != '\0') { 49 if (c == '\\' && eflag) { 50 switch (*p++) { 51 case 'b': c = '\b'; break; 52 case 'c': return 0; /* exit */ 53 case 'f': c = '\f'; break; 54 case 'n': c = '\n'; break; 55 case 'r': c = '\r'; break; 56 case 't': c = '\t'; break; 57 case 'v': c = '\v'; break; 58 case '\\': break; /* c = '\\' */ 59 case '0': 60 c = 0; 61 count = 3; 62 while (--count >= 0 && (unsigned)(*p - '0') < 8) 63 c = (c << 3) + (*p++ - '0'); 64 break; 65 default: 66 p--; 67 break; 68 } 69 } 70 putchar(c); 71 } 72 if (*ap) 73 putchar(' '); 74 } 75 if (! nflag) 76 putchar('\n'); 77 return 0; 78 } 79