usr.bin/paste/paste.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   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.
   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 #ifndef lint
  36 static const char copyright[] =
  37 "@(#) Copyright (c) 1989, 1993\n\
  38         The Regents of the University of California.  All rights reserved.\n";
  39 #endif /* not lint */
  40
  41 #if 0
  42 #ifndef lint
  43 static char sccsid[] = "@(#)paste.c     8.1 (Berkeley) 6/6/93";
  44 #endif /* not lint */
  45 #endif
  46
  47 #include <sys/cdefs.h>
  48 __FBSDID("$FreeBSD$");
  49
  50 #include <sys/types.h>
  51
  52 #include <err.h>
  53 #include <errno.h>
  54 #include <limits.h>
  55 #include <locale.h>
  56 #include <stdio.h>
  57 #include <stdlib.h>
  58 #include <string.h>
  59 #include <unistd.h>
  60 #include <wchar.h>
  61
  62 static wchar_t *delim;
  63 static int delimcnt;
  64
  65 static int parallel(char **);
  66 static int sequential(char **);
  67 static int tr(wchar_t *);
  68 static void usage(void);
  69
  70 static wchar_t tab[] = L"\t";
  71
  72 int
  73 main(int argc, char *argv[])
  74 {
  75         int ch, rval, seq;
  76         wchar_t *warg;
  77         const char *arg;
  78         size_t len;
  79
  80         setlocale(LC_CTYPE, "");
  81
  82         seq = 0;
  83         while ((ch = getopt(argc, argv, "d:s")) != -1)
  84                 switch(ch) {
  85                 case 'd':
  86                         arg = optarg;
  87                         len = mbsrtowcs(NULL, &arg, 0, NULL);
  88                         if (len == (size_t)-1)
  89                                 err(1, "delimiters");
  90                         warg = malloc((len + 1) * sizeof(*warg));
  91                         if (warg == NULL)
  92                                 err(1, NULL);
  93                         arg = optarg;
  94                         len = mbsrtowcs(warg, &arg, len + 1, NULL);
  95                         if (len == (size_t)-1)
  96                                 err(1, "delimiters");
  97                         delimcnt = tr(delim = warg);
  98                         break;
  99                 case 's':
 100                         seq = 1;
 101                         break;
 102                 case '?':
 103                 default:
 104                         usage();
 105                 }
 106         argc -= optind;
 107         argv += optind;
 108
 109         if (*argv == NULL)
 110                 usage();
 111         if (!delim) {
 112                 delimcnt = 1;
 113                 delim = tab;
 114         }
 115
 116         if (seq)
 117                 rval = sequential(argv);
 118         else
 119                 rval = parallel(argv);
 120         exit(rval);
 121 }
 122
 123 typedef struct _list {
 124         struct _list *next;
 125         FILE *fp;
 126         int cnt;
 127         char *name;
 128 } LIST;
 129
 130 static int
 131 parallel(char **argv)
 132 {
 133         LIST *lp;
 134         int cnt;
 135         wint_t ich;
 136         wchar_t ch;
 137         char *p;
 138         LIST *head, *tmp;
 139         int opencnt, output;
 140
 141         for (cnt = 0, head = tmp = NULL; (p = *argv); ++argv, ++cnt) {
 142                 if ((lp = malloc(sizeof(LIST))) == NULL)
 143                         err(1, NULL);
 144                 if (p[0] == '-' && !p[1])
 145                         lp->fp = stdin;
 146                 else if (!(lp->fp = fopen(p, "r")))
 147                         err(1, "%s", p);
 148                 lp->next = NULL;
 149                 lp->cnt = cnt;
 150                 lp->name = p;
 151                 if (!head)
 152                         head = tmp = lp;
 153                 else {
 154                         tmp->next = lp;
 155                         tmp = lp;
 156                 }
 157         }
 158
 159         for (opencnt = cnt; opencnt;) {
 160                 for (output = 0, lp = head; lp; lp = lp->next) {
 161                         if (!lp->fp) {
 162                                 if (output && lp->cnt &&
 163                                     (ch = delim[(lp->cnt - 1) % delimcnt]))
 164                                         putwchar(ch);
 165                                 continue;
 166                         }
 167                         if ((ich = getwc(lp->fp)) == WEOF) {
 168                                 if (!--opencnt)
 169                                         break;
 170                                 lp->fp = NULL;
 171                                 if (output && lp->cnt &&
 172                                     (ch = delim[(lp->cnt - 1) % delimcnt]))
 173                                         putwchar(ch);
 174                                 continue;
 175                         }
 176                         /*
 177                          * make sure that we don't print any delimiters
 178                          * unless there's a non-empty file.
 179                          */
 180                         if (!output) {
 181                                 output = 1;
 182                                 for (cnt = 0; cnt < lp->cnt; ++cnt)
 183                                         if ((ch = delim[cnt % delimcnt]))
 184                                                 putwchar(ch);
 185                         } else if ((ch = delim[(lp->cnt - 1) % delimcnt]))
 186                                 putwchar(ch);
 187                         if (ich == '\n')
 188                                 continue;
 189                         do {
 190                                 putwchar(ich);
 191                         } while ((ich = getwc(lp->fp)) != WEOF && ich != '\n');
 192                 }
 193                 if (output)
 194                         putwchar('\n');
 195         }
 196
 197         return (0);
 198 }
 199
 200 static int
 201 sequential(char **argv)
 202 {
 203         FILE *fp;
 204         int cnt, failed, needdelim;
 205         wint_t ch;
 206         char *p;
 207
 208         failed = 0;
 209         for (; (p = *argv); ++argv) {
 210                 if (p[0] == '-' && !p[1])
 211                         fp = stdin;
 212                 else if (!(fp = fopen(p, "r"))) {
 213                         warn("%s", p);
 214                         failed = 1;
 215                         continue;
 216                 }
 217                 cnt = needdelim = 0;
 218                 while ((ch = getwc(fp)) != WEOF) {
 219                         if (needdelim) {
 220                                 needdelim = 0;
 221                                 if (delim[cnt] != '\0')
 222                                         putwchar(delim[cnt]);
 223                                 if (++cnt == delimcnt)
 224                                         cnt = 0;
 225                         }
 226                         if (ch != '\n')
 227                                 putwchar(ch);
 228                         else
 229                                 needdelim = 1;
 230                 }
 231                 if (needdelim)
 232                         putwchar('\n');
 233                 if (fp != stdin)
 234                         (void)fclose(fp);
 235         }
 236
 237         return (failed != 0);
 238 }
 239
 240 static int
 241 tr(wchar_t *arg)
 242 {
 243         int cnt;
 244         wchar_t ch, *p;
 245
 246         for (p = arg, cnt = 0; (ch = *p++); ++arg, ++cnt)
 247                 if (ch == '\\')
 248                         switch(ch = *p++) {
 249                         case 'n':
 250                                 *arg = '\n';
 251                                 break;
 252                         case 't':
 253                                 *arg = '\t';
 254                                 break;
 255                         case '0':
 256                                 *arg = '\0';
 257                                 break;
 258                         default:
 259                                 *arg = ch;
 260                                 break;
 261                 } else
 262                         *arg = ch;
 263
 264         if (!cnt)
 265                 errx(1, "no delimiters specified");
 266         return(cnt);
 267 }
 268
 269 static void
 270 usage(void)
 271 {
 272         (void)fprintf(stderr, "usage: paste [-s] [-d delimiters] file ...\n");
 273         exit(1);
 274 }