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 #include <sys/types.h>
  36
  37 #include <err.h>
  38 #include <errno.h>
  39 #include <limits.h>
  40 #include <locale.h>
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <unistd.h>
  45 #include <wchar.h>
  46
  47 static wchar_t *delim;
  48 static int delimcnt;
  49
  50 static int parallel(char **);
  51 static int sequential(char **);
  52 static int tr(wchar_t *);
  53 static void usage(void) __dead2;
  54
  55 static wchar_t tab[] = L"\t";
  56
  57 int
  58 main(int argc, char *argv[])
  59 {
  60         int ch, rval, seq;
  61         wchar_t *warg;
  62         const char *arg;
  63         size_t len;
  64
  65         setlocale(LC_CTYPE, "");
  66
  67         seq = 0;
  68         while ((ch = getopt(argc, argv, "d:s")) != -1)
  69                 switch(ch) {
  70                 case 'd':
  71                         arg = optarg;
  72                         len = mbsrtowcs(NULL, &arg, 0, NULL);
  73                         if (len == (size_t)-1)
  74                                 err(1, "delimiters");
  75                         warg = malloc((len + 1) * sizeof(*warg));
  76                         if (warg == NULL)
  77                                 err(1, NULL);
  78                         arg = optarg;
  79                         len = mbsrtowcs(warg, &arg, len + 1, NULL);
  80                         if (len == (size_t)-1)
  81                                 err(1, "delimiters");
  82                         delimcnt = tr(delim = warg);
  83                         break;
  84                 case 's':
  85                         seq = 1;
  86                         break;
  87                 case '?':
  88                 default:
  89                         usage();
  90                 }
  91         argc -= optind;
  92         argv += optind;
  93
  94         if (*argv == NULL)
  95                 usage();
  96         if (!delim) {
  97                 delimcnt = 1;
  98                 delim = tab;
  99         }
 100
 101         if (seq)
 102                 rval = sequential(argv);
 103         else
 104                 rval = parallel(argv);
 105         exit(rval);
 106 }
 107
 108 typedef struct _list {
 109         struct _list *next;
 110         FILE *fp;
 111         int cnt;
 112         char *name;
 113 } LIST;
 114
 115 static int
 116 parallel(char **argv)
 117 {
 118         LIST *lp;
 119         int cnt;
 120         wint_t ich;
 121         wchar_t ch;
 122         char *p;
 123         LIST *head, *tmp;
 124         int opencnt, output;
 125
 126         for (cnt = 0, head = tmp = NULL; (p = *argv); ++argv, ++cnt) {
 127                 if ((lp = malloc(sizeof(LIST))) == NULL)
 128                         err(1, NULL);
 129                 if (p[0] == '-' && !p[1])
 130                         lp->fp = stdin;
 131                 else if (!(lp->fp = fopen(p, "r")))
 132                         err(1, "%s", p);
 133                 lp->next = NULL;
 134                 lp->cnt = cnt;
 135                 lp->name = p;
 136                 if (!head)
 137                         head = tmp = lp;
 138                 else {
 139                         tmp->next = lp;
 140                         tmp = lp;
 141                 }
 142         }
 143
 144         for (opencnt = cnt; opencnt;) {
 145                 for (output = 0, lp = head; lp; lp = lp->next) {
 146                         if (!lp->fp) {
 147                                 if (output && lp->cnt &&
 148                                     (ch = delim[(lp->cnt - 1) % delimcnt]))
 149                                         putwchar(ch);
 150                                 continue;
 151                         }
 152                         if ((ich = getwc(lp->fp)) == WEOF) {
 153                                 if (!--opencnt)
 154                                         break;
 155                                 lp->fp = NULL;
 156                                 if (output && lp->cnt &&
 157                                     (ch = delim[(lp->cnt - 1) % delimcnt]))
 158                                         putwchar(ch);
 159                                 continue;
 160                         }
 161                         /*
 162                          * make sure that we don't print any delimiters
 163                          * unless there's a non-empty file.
 164                          */
 165                         if (!output) {
 166                                 output = 1;
 167                                 for (cnt = 0; cnt < lp->cnt; ++cnt)
 168                                         if ((ch = delim[cnt % delimcnt]))
 169                                                 putwchar(ch);
 170                         } else if ((ch = delim[(lp->cnt - 1) % delimcnt]))
 171                                 putwchar(ch);
 172                         if (ich == '\n')
 173                                 continue;
 174                         do {
 175                                 putwchar(ich);
 176                         } while ((ich = getwc(lp->fp)) != WEOF && ich != '\n');
 177                 }
 178                 if (output)
 179                         putwchar('\n');
 180         }
 181
 182         return (0);
 183 }
 184
 185 static int
 186 sequential(char **argv)
 187 {
 188         FILE *fp;
 189         int cnt, failed, needdelim;
 190         wint_t ch;
 191         char *p;
 192
 193         failed = 0;
 194         for (; (p = *argv); ++argv) {
 195                 if (p[0] == '-' && !p[1])
 196                         fp = stdin;
 197                 else if (!(fp = fopen(p, "r"))) {
 198                         warn("%s", p);
 199                         failed = 1;
 200                         continue;
 201                 }
 202                 cnt = needdelim = 0;
 203                 while ((ch = getwc(fp)) != WEOF) {
 204                         if (needdelim) {
 205                                 needdelim = 0;
 206                                 if (delim[cnt] != '\0')
 207                                         putwchar(delim[cnt]);
 208                                 if (++cnt == delimcnt)
 209                                         cnt = 0;
 210                         }
 211                         if (ch != '\n')
 212                                 putwchar(ch);
 213                         else
 214                                 needdelim = 1;
 215                 }
 216                 if (needdelim)
 217                         putwchar('\n');
 218                 if (fp != stdin)
 219                         (void)fclose(fp);
 220         }
 221
 222         return (failed != 0);
 223 }
 224
 225 static int
 226 tr(wchar_t *arg)
 227 {
 228         int cnt;
 229         wchar_t ch, *p;
 230
 231         for (p = arg, cnt = 0; (ch = *p++); ++arg, ++cnt)
 232                 if (ch == '\\')
 233                         switch(ch = *p++) {
 234                         case 'n':
 235                                 *arg = '\n';
 236                                 break;
 237                         case 't':
 238                                 *arg = '\t';
 239                                 break;
 240                         case '0':
 241                                 *arg = '\0';
 242                                 break;
 243                         default:
 244                                 *arg = ch;
 245                                 break;
 246                 } else
 247                         *arg = ch;
 248
 249         if (!cnt)
 250                 errx(1, "no delimiters specified");
 251         return(cnt);
 252 }
 253
 254 static void
 255 usage(void)
 256 {
 257         (void)fprintf(stderr, "usage: paste [-s] [-d delimiters] file ...\n");
 258         exit(1);
 259 }