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bltin.h
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echo.c
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Editing: echo.c
/*- * SPDX-License-Identifier: BSD-3-Clause * * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Kenneth Almquist. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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. * * @(#)echo.c 8.2 (Berkeley) 5/4/95 */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); /* * Echo command. */ #define main echocmd #include "bltin.h" /* #define eflag 1 */ int main(int argc, char *argv[]) { char **ap; char *p; char c; int count; int nflag = 0; #ifndef eflag int eflag = 0; #endif ap = argv; if (argc) ap++; if ((p = *ap) != NULL) { if (equal(p, "-n")) { nflag++; ap++; } else if (equal(p, "-e")) { #ifndef eflag eflag++; #endif ap++; } } while ((p = *ap++) != NULL) { while ((c = *p++) != '\0') { if (c == '\\' && eflag) { switch (*p++) { case 'a': c = '\a'; break; case 'b': c = '\b'; break; case 'c': return 0; /* exit */ case 'e': c = '\033'; break; case 'f': c = '\f'; break; case 'n': c = '\n'; break; case 'r': c = '\r'; break; case 't': c = '\t'; break; case 'v': c = '\v'; break; case '\\': break; /* c = '\\' */ case '0': c = 0; count = 3; while (--count >= 0 && (unsigned)(*p - '0') < 8) c = (c << 3) + (*p++ - '0'); break; default: p--; break; } } putchar(c); } if (*ap) putchar(' '); } if (! nflag) putchar('\n'); return 0; }
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