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  * 3. 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  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
  33  * @(#)paste.c  8.1 (Berkeley) 6/6/93
  34  * $FreeBSD: head/usr.bin/paste/paste.c 227242 2011-11-06 18:49:53Z ed $
  35  */
  36
  37 #include <sys/types.h>
  38
  39 #include <err.h>
  40 #include <errno.h>
  41 #include <limits.h>
  42 #include <locale.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47 #include <wchar.h>
  48
  49 static wchar_t *delim;
  50 static int delimcnt;
  51
  52 static int parallel(char **);
  53 static int sequential(char **);
  54 static int tr(wchar_t *);
  55 static void usage(void);
  56
  57 static wchar_t tab[] = L"\t";
  58
  59 int
  60 main(int argc, char *argv[])
  61 {
  62         int ch, rval, seq;
  63         wchar_t *warg;
  64         const char *arg;
  65         size_t len;
  66
  67         setlocale(LC_CTYPE, "");
  68
  69         seq = 0;
  70         while ((ch = getopt(argc, argv, "d:s")) != -1)
  71                 switch(ch) {
  72                 case 'd':
  73                         arg = optarg;
  74                         len = mbsrtowcs(NULL, &arg, 0, NULL);
  75                         if (len == (size_t)-1)
  76                                 err(1, "delimiters");
  77                         warg = malloc((len + 1) * sizeof(*warg));
  78                         if (warg == NULL)
  79                                 err(1, NULL);
  80                         arg = optarg;
  81                         len = mbsrtowcs(warg, &arg, len + 1, NULL);
  82                         if (len == (size_t)-1)
  83                                 err(1, "delimiters");
  84                         delimcnt = tr(delim = warg);
  85                         break;
  86                 case 's':
  87                         seq = 1;
  88                         break;
  89                 case '?':
  90                 default:
  91                         usage();
  92                 }
  93         argc -= optind;
  94         argv += optind;
  95
  96         if (*argv == NULL)
  97                 usage();
  98         if (!delim) {
  99                 delimcnt = 1;
 100                 delim = tab;
 101         }
 102
 103         if (seq)
 104                 rval = sequential(argv);
 105         else
 106                 rval = parallel(argv);
 107         exit(rval);
 108 }
 109
 110 typedef struct _list {
 111         struct _list *next;
 112         FILE *fp;
 113         int cnt;
 114         char *name;
 115 } LIST;
 116
 117 static int
 118 parallel(char **argv)
 119 {
 120         LIST *lp;
 121         int cnt;
 122         wint_t ich;
 123         wchar_t ch;
 124         char *p;
 125         LIST *head, *tmp;
 126         int opencnt, output;
 127
 128         for (cnt = 0, head = tmp = NULL; (p = *argv); ++argv, ++cnt) {
 129                 if ((lp = malloc(sizeof(LIST))) == NULL)
 130                         err(1, NULL);
 131                 if (p[0] == '-' && !p[1])
 132                         lp->fp = stdin;
 133                 else if (!(lp->fp = fopen(p, "r")))
 134                         err(1, "%s", p);
 135                 lp->next = NULL;
 136                 lp->cnt = cnt;
 137                 lp->name = p;
 138                 if (!head)
 139                         head = tmp = lp;
 140                 else {
 141                         tmp->next = lp;
 142                         tmp = lp;
 143                 }
 144         }
 145
 146         for (opencnt = cnt; opencnt;) {
 147                 for (output = 0, lp = head; lp; lp = lp->next) {
 148                         if (!lp->fp) {
 149                                 if (output && lp->cnt &&
 150                                     (ch = delim[(lp->cnt - 1) % delimcnt]))
 151                                         putwchar(ch);
 152                                 continue;
 153                         }
 154                         if ((ich = getwc(lp->fp)) == WEOF) {
 155                                 if (!--opencnt)
 156                                         break;
 157                                 lp->fp = NULL;
 158                                 if (output && lp->cnt &&
 159                                     (ch = delim[(lp->cnt - 1) % delimcnt]))
 160                                         putwchar(ch);
 161                                 continue;
 162                         }
 163                         /*
 164                          * make sure that we don't print any delimiters
 165                          * unless there's a non-empty file.
 166                          */
 167                         if (!output) {
 168                                 output = 1;
 169                                 for (cnt = 0; cnt < lp->cnt; ++cnt)
 170                                         if ((ch = delim[cnt % delimcnt]))
 171                                                 putwchar(ch);
 172                         } else if ((ch = delim[(lp->cnt - 1) % delimcnt]))
 173                                 putwchar(ch);
 174                         if (ich == '\n')
 175                                 continue;
 176                         do {
 177                                 putwchar(ich);
 178                         } while ((ich = getwc(lp->fp)) != WEOF && ich != '\n');
 179                 }
 180                 if (output)
 181                         putwchar('\n');
 182         }
 183
 184         return (0);
 185 }
 186
 187 static int
 188 sequential(char **argv)
 189 {
 190         FILE *fp;
 191         int cnt, failed, needdelim;
 192         wint_t ch;
 193         char *p;
 194
 195         failed = 0;
 196         for (; (p = *argv); ++argv) {
 197                 if (p[0] == '-' && !p[1])
 198                         fp = stdin;
 199                 else if (!(fp = fopen(p, "r"))) {
 200                         warn("%s", p);
 201                         failed = 1;
 202                         continue;
 203                 }
 204                 cnt = needdelim = 0;
 205                 while ((ch = getwc(fp)) != WEOF) {
 206                         if (needdelim) {
 207                                 needdelim = 0;
 208                                 if (delim[cnt] != '\0')
 209                                         putwchar(delim[cnt]);
 210                                 if (++cnt == delimcnt)
 211                                         cnt = 0;
 212                         }
 213                         if (ch != '\n')
 214                                 putwchar(ch);
 215                         else
 216                                 needdelim = 1;
 217                 }
 218                 if (needdelim)
 219                         putwchar('\n');
 220                 if (fp != stdin)
 221                         (void)fclose(fp);
 222         }
 223
 224         return (failed != 0);
 225 }
 226
 227 static int
 228 tr(wchar_t *arg)
 229 {
 230         int cnt;
 231         wchar_t ch, *p;
 232
 233         for (p = arg, cnt = 0; (ch = *p++); ++arg, ++cnt)
 234                 if (ch == '\\')
 235                         switch(ch = *p++) {
 236                         case 'n':
 237                                 *arg = '\n';
 238                                 break;
 239                         case 't':
 240                                 *arg = '\t';
 241                                 break;
 242                         case '0':
 243                                 *arg = '\0';
 244                                 break;
 245                         default:
 246                                 *arg = ch;
 247                                 break;
 248                 } else
 249                         *arg = ch;
 250
 251         if (!cnt)
 252                 errx(1, "no delimiters specified");
 253         return(cnt);
 254 }
 255
 256 static void
 257 usage(void)
 258 {
 259         (void)fprintf(stderr, "usage: paste [-s] [-d delimiters] file ...\n");
 260         exit(1);
 261 }