usr.bin/paste/paste.c

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Adam S. Moskowitz of Menlo Consulting.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #ifndef lint
  34 static const char copyright[] =
  35 "@(#) Copyright (c) 1989, 1993\n\
  36         The Regents of the University of California.  All rights reserved.\n";
  37 #endif /* not lint */
  38
  39 #if 0
  40 #ifndef lint
  41 static char sccsid[] = "@(#)paste.c     8.1 (Berkeley) 6/6/93";
  42 #endif /* not lint */
  43 #endif
  44
  45 #include <sys/cdefs.h>
  46 __FBSDID("$FreeBSD$");
  47
  48 #include <sys/types.h>
  49
  50 #include <err.h>
  51 #include <errno.h>
  52 #include <limits.h>
  53 #include <locale.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <unistd.h>
  58 #include <wchar.h>
  59
  60 static wchar_t *delim;
  61 static int delimcnt;
  62
  63 static int parallel(char **);
  64 static int sequential(char **);
  65 static int tr(wchar_t *);
  66 static void usage(void);
  67
  68 static wchar_t tab[] = L"\t";
  69
  70 int
  71 main(int argc, char *argv[])
  72 {
  73         int ch, rval, seq;
  74         wchar_t *warg;
  75         const char *arg;
  76         size_t len;
  77
  78         setlocale(LC_CTYPE, "");
  79
  80         seq = 0;
  81         while ((ch = getopt(argc, argv, "d:s")) != -1)
  82                 switch(ch) {
  83                 case 'd':
  84                         arg = optarg;
  85                         len = mbsrtowcs(NULL, &arg, 0, NULL);
  86                         if (len == (size_t)-1)
  87                                 err(1, "delimiters");
  88                         warg = malloc((len + 1) * sizeof(*warg));
  89                         if (warg == NULL)
  90                                 err(1, NULL);
  91                         arg = optarg;
  92                         len = mbsrtowcs(warg, &arg, len + 1, NULL);
  93                         if (len == (size_t)-1)
  94                                 err(1, "delimiters");
  95                         delimcnt = tr(delim = warg);
  96                         break;
  97                 case 's':
  98                         seq = 1;
  99                         break;
 100                 case '?':
 101                 default:
 102                         usage();
 103                 }
 104         argc -= optind;
 105         argv += optind;
 106
 107         if (*argv == NULL)
 108                 usage();
 109         if (!delim) {
 110                 delimcnt = 1;
 111                 delim = tab;
 112         }
 113
 114         if (seq)
 115                 rval = sequential(argv);
 116         else
 117                 rval = parallel(argv);
 118         exit(rval);
 119 }
 120
 121 typedef struct _list {
 122         struct _list *next;
 123         FILE *fp;
 124         int cnt;
 125         char *name;
 126 } LIST;
 127
 128 static int
 129 parallel(char **argv)
 130 {
 131         LIST *lp;
 132         int cnt;
 133         wint_t ich;
 134         wchar_t ch;
 135         char *p;
 136         LIST *head, *tmp;
 137         int opencnt, output;
 138
 139         for (cnt = 0, head = tmp = NULL; (p = *argv); ++argv, ++cnt) {
 140                 if ((lp = malloc(sizeof(LIST))) == NULL)
 141                         err(1, NULL);
 142                 if (p[0] == '-' && !p[1])
 143                         lp->fp = stdin;
 144                 else if (!(lp->fp = fopen(p, "r")))
 145                         err(1, "%s", p);
 146                 lp->next = NULL;
 147                 lp->cnt = cnt;
 148                 lp->name = p;
 149                 if (!head)
 150                         head = tmp = lp;
 151                 else {
 152                         tmp->next = lp;
 153                         tmp = lp;
 154                 }
 155         }
 156
 157         for (opencnt = cnt; opencnt;) {
 158                 for (output = 0, lp = head; lp; lp = lp->next) {
 159                         if (!lp->fp) {
 160                                 if (output && lp->cnt &&
 161                                     (ch = delim[(lp->cnt - 1) % delimcnt]))
 162                                         putwchar(ch);
 163                                 continue;
 164                         }
 165                         if ((ich = getwc(lp->fp)) == WEOF) {
 166                                 if (!--opencnt)
 167                                         break;
 168                                 lp->fp = NULL;
 169                                 if (output && lp->cnt &&
 170                                     (ch = delim[(lp->cnt - 1) % delimcnt]))
 171                                         putwchar(ch);
 172                                 continue;
 173                         }
 174                         /*
 175                          * make sure that we don't print any delimiters
 176                          * unless there's a non-empty file.
 177                          */
 178                         if (!output) {
 179                                 output = 1;
 180                                 for (cnt = 0; cnt < lp->cnt; ++cnt)
 181                                         if ((ch = delim[cnt % delimcnt]))
 182                                                 putwchar(ch);
 183                         } else if ((ch = delim[(lp->cnt - 1) % delimcnt]))
 184                                 putwchar(ch);
 185                         if (ich == '\n')
 186                                 continue;
 187                         do {
 188                                 putwchar(ich);
 189                         } while ((ich = getwc(lp->fp)) != WEOF && ich != '\n');
 190                 }
 191                 if (output)
 192                         putwchar('\n');
 193         }
 194
 195         return (0);
 196 }
 197
 198 static int
 199 sequential(char **argv)
 200 {
 201         FILE *fp;
 202         int cnt, failed, needdelim;
 203         wint_t ch;
 204         char *p;
 205
 206         failed = 0;
 207         for (; (p = *argv); ++argv) {
 208                 if (p[0] == '-' && !p[1])
 209                         fp = stdin;
 210                 else if (!(fp = fopen(p, "r"))) {
 211                         warn("%s", p);
 212                         failed = 1;
 213                         continue;
 214                 }
 215                 cnt = needdelim = 0;
 216                 while ((ch = getwc(fp)) != WEOF) {
 217                         if (needdelim) {
 218                                 needdelim = 0;
 219                                 if (delim[cnt] != '\0')
 220                                         putwchar(delim[cnt]);
 221                                 if (++cnt == delimcnt)
 222                                         cnt = 0;
 223                         }
 224                         if (ch != '\n')
 225                                 putwchar(ch);
 226                         else
 227                                 needdelim = 1;
 228                 }
 229                 if (needdelim)
 230                         putwchar('\n');
 231                 if (fp != stdin)
 232                         (void)fclose(fp);
 233         }
 234
 235         return (failed != 0);
 236 }
 237
 238 static int
 239 tr(wchar_t *arg)
 240 {
 241         int cnt;
 242         wchar_t ch, *p;
 243
 244         for (p = arg, cnt = 0; (ch = *p++); ++arg, ++cnt)
 245                 if (ch == '\\')
 246                         switch(ch = *p++) {
 247                         case 'n':
 248                                 *arg = '\n';
 249                                 break;
 250                         case 't':
 251                                 *arg = '\t';
 252                                 break;
 253                         case '0':
 254                                 *arg = '\0';
 255                                 break;
 256                         default:
 257                                 *arg = ch;
 258                                 break;
 259                 } else
 260                         *arg = ch;
 261
 262         if (!cnt)
 263                 errx(1, "no delimiters specified");
 264         return(cnt);
 265 }
 266
 267 static void
 268 usage(void)
 269 {
 270         (void)fprintf(stderr, "usage: paste [-s] [-d delimiters] file ...\n");
 271         exit(1);
 272 }