commands/cut/x_cut.c

   1 /*      $NetBSD: x_cut.c,v 1.2 2007/07/02 18:41:04 christos Exp $       */
   2
   3 /*
   4  * Copyright (c) 1989, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Adam S. Moskowitz of Menlo Consulting and Marciano Pitargue.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 /*
  36  *  This file is #include'd twice from cut.c, to generate both
  37  *  single- and multibyte versions of the same code.
  38  *
  39  *  In cut.c #define:
  40  *   CUT_BYTE=0 to define b_cut (singlebyte), and
  41  *   CUT_BYTE=1 to define c_cut (multibyte).
  42  *
  43  */
  44
  45 #if (CUT_BYTE == 1)
  46 #  define CUT_FN                b_cut
  47 #  define CUT_CH_T              int
  48 #  define CUT_GETC              getc
  49 #  define CUT_EOF               EOF
  50 #  define CUT_PUTCHAR           putchar
  51 #else
  52 #  define CUT_FN                c_cut
  53 #  define CUT_CH_T              wint_t
  54 #  define CUT_GETC              getwc
  55 #  define CUT_EOF               WEOF
  56 #  define CUT_PUTCHAR           putwchar
  57 #endif
  58
  59
  60 /* ARGSUSED */
  61 static void
  62 CUT_FN(FILE *fp, const char *fname __unused)
  63 {
  64         CUT_CH_T ch;
  65         int col;
  66         char *pos;
  67
  68         ch = 0;
  69         for (;;) {
  70                 pos = positions + 1;
  71                 for (col = maxval; col; --col) {
  72                         if ((ch = CUT_GETC(fp)) == EOF)
  73                                 return;
  74                         if (ch == '\n')
  75                                 break;
  76                         if (*pos++)
  77                                 (void)CUT_PUTCHAR(ch);
  78                 }
  79                 if (ch != '\n') {
  80                         if (autostop)
  81                                 while ((ch = CUT_GETC(fp)) != CUT_EOF && ch != '\n')
  82                                         (void)CUT_PUTCHAR(ch);
  83                         else
  84                                 while ((ch = CUT_GETC(fp)) != CUT_EOF && ch != '\n');
  85                 }
  86                 (void)CUT_PUTCHAR('\n');
  87         }
  88 }
  89
  90 #undef CUT_FN
  91 #undef CUT_CH_T
  92 #undef CUT_GETC
  93 #undef CUT_EOF
  94 #undef CUT_PUTCHAR
  95