misc cleanup

[unix-history] / usr / src / bin / sh / bltin / echo.c

/*-
* 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.
*
* %sccs.include.redist.c%
*
*      @(#)echo.c      8.2 (Berkeley) %G%
*/

/*
* Echo command.
*/

#define main echocmd

#include "bltin.h"

/* #define eflag 1 */

int
main(argc, argv)
       int argc;
       char **argv;
{
       register char **ap;
       register char *p;
       register 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 'b':  c = '\b';  break;
                               case 'c':  return 0;            /* exit */
                               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;
}