text_cmds/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. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #ifndef lint
  38 static const char copyright[] =
  39 "@(#) Copyright (c) 1989, 1993\n\
  40         The Regents of the University of California.  All rights reserved.\n";
  41 #endif /* not lint */
  42
  43 #if 0
  44 #ifndef lint
  45 static char sccsid[] = "@(#)paste.c     8.1 (Berkeley) 6/6/93";
  46 #endif /* not lint */
  47 #endif
  48
  49 #include <sys/cdefs.h>
  50 __FBSDID("$FreeBSD: src/usr.bin/paste/paste.c,v 1.14 2004/06/25 01:48:43 tjr Exp $");
  51
  52 #include <sys/types.h>
  53
  54 #include <err.h>
  55 #include <errno.h>
  56 #include <limits.h>
  57 #include <locale.h>
  58 #include <stdio.h>
  59 #include <stdlib.h>
  60 #include <string.h>
  61 #include <unistd.h>
  62 #include <wchar.h>
  63 #include <sysexits.h>
  64
  65 wchar_t *delim;
  66 int delimcnt;
  67
  68 int parallel(char **);
  69 int sequential(char **);
  70 int tr(wchar_t *);
  71 static void usage(void);
  72
  73 wchar_t tab[] = L"\t";
  74
  75 int
  76 main(int argc, char *argv[])
  77 {
  78         int ch, rval, seq;
  79         wchar_t *warg;
  80         const char *arg;
  81         size_t len;
  82
  83         setlocale(LC_CTYPE, "");
  84
  85         seq = 0;
  86         while ((ch = getopt(argc, argv, "d:s")) != -1)
  87                 switch(ch) {
  88                 case 'd':
  89                         arg = optarg;
  90                         len = mbsrtowcs(NULL, &arg, 0, NULL);
  91                         if (len == (size_t)-1)
  92                                 err(1, "delimiters");
  93                         warg = malloc((len + 1) * sizeof(*warg));
  94                         if (warg == NULL)
  95                                 err(1, NULL);
  96                         arg = optarg;
  97                         len = mbsrtowcs(warg, &arg, len + 1, NULL);
  98                         if (len == (size_t)-1)
  99                                 err(1, "delimiters");
 100                         delimcnt = tr(delim = warg);
 101                         break;
 102                 case 's':
 103                         seq = 1;
 104                         break;
 105                 case '?':
 106                 default:
 107                         usage();
 108                 }
 109         argc -= optind;
 110         argv += optind;
 111
 112         if (*argv == NULL)
 113                 usage();
 114         if (!delim) {
 115                 delimcnt = 1;
 116                 delim = tab;
 117         }
 118
 119         if (seq)
 120                 rval = sequential(argv);
 121         else
 122                 rval = parallel(argv);
 123         exit(rval);
 124 }
 125
 126 typedef struct _list {
 127         struct _list *next;
 128         FILE *fp;
 129         int cnt;
 130         char *name;
 131 } LIST;
 132
 133 int
 134 parallel(char **argv)
 135 {
 136         LIST *lp;
 137         int cnt;
 138         wint_t ich;
 139         wchar_t ch;
 140         char *p;
 141         LIST *head, *tmp;
 142         int opencnt, output;
 143
 144         for (cnt = 0, head = NULL; (p = *argv); ++argv, ++cnt) {
 145                 if ((lp = malloc(sizeof(LIST))) == NULL)
 146                         err(1, NULL);
 147                 if (p[0] == '-' && !p[1])
 148                         lp->fp = stdin;
 149                 else if (!(lp->fp = fopen(p, "r")))
 150                         err(1, "%s", p);
 151                 lp->next = NULL;
 152                 lp->cnt = cnt;
 153                 lp->name = p;
 154                 if (!head)
 155                         head = tmp = lp;
 156                 else {
 157                         tmp->next = lp;
 158                         tmp = lp;
 159                 }
 160         }
 161
 162         for (opencnt = cnt; opencnt;) {
 163                 for (output = 0, lp = head; lp; lp = lp->next) {
 164                         if (!lp->fp) {
 165                                 if (output && lp->cnt &&
 166                                     (ch = delim[(lp->cnt - 1) % delimcnt]))
 167                                         putwchar(ch);
 168                                 continue;
 169                         }
 170                         if ((ich = getwc(lp->fp)) == WEOF) {
 171                                 if (!--opencnt)
 172                                         break;
 173                                 lp->fp = NULL;
 174                                 if (output && lp->cnt &&
 175                                     (ch = delim[(lp->cnt - 1) % delimcnt]))
 176                                         putwchar(ch);
 177                                 continue;
 178                         }
 179                         /*
 180                          * make sure that we don't print any delimiters
 181                          * unless there's a non-empty file.
 182                          */
 183                         if (!output) {
 184                                 output = 1;
 185                                 for (cnt = 0; cnt < lp->cnt; ++cnt)
 186                                         if ((ch = delim[cnt % delimcnt]))
 187                                                 putwchar(ch);
 188                         } else if ((ch = delim[(lp->cnt - 1) % delimcnt]))
 189                                 putwchar(ch);
 190                         if (ich == '\n')
 191                                 continue;
 192                         do {
 193                                 putwchar(ich);
 194                         } while ((ich = getwc(lp->fp)) != WEOF && ich != '\n');
 195                         if (ferror(lp->fp)) {
 196                                 errx(EX_IOERR, "Error reading %s", lp->name);
 197                         }
 198                 }
 199                 if (output)
 200                         putwchar('\n');
 201         }
 202
 203         return (0);
 204 }
 205
 206 int
 207 sequential(char **argv)
 208 {
 209         FILE *fp;
 210         int cnt, failed, needdelim;
 211         wint_t ch;
 212         char *p;
 213
 214         failed = 0;
 215         for (; (p = *argv); ++argv) {
 216                 if (p[0] == '-' && !p[1])
 217                         fp = stdin;
 218                 else if (!(fp = fopen(p, "r"))) {
 219                         warn("%s", p);
 220                         failed = 1;
 221                         continue;
 222                 }
 223                 cnt = needdelim = 0;
 224                 while ((ch = getwc(fp)) != WEOF) {
 225                         if (needdelim) {
 226                                 needdelim = 0;
 227                                 if (delim[cnt] != '\0')
 228                                         putwchar(delim[cnt]);
 229                                 if (++cnt == delimcnt)
 230                                         cnt = 0;
 231                         }
 232                         if (ch != '\n')
 233                                 putwchar(ch);
 234                         else
 235                                 needdelim = 1;
 236                 }
 237                 if (needdelim)
 238                         putwchar('\n');
 239                 if (fp != stdin)
 240                         (void)fclose(fp);
 241         }
 242
 243         return (failed != 0);
 244 }
 245
 246 int
 247 tr(wchar_t *arg)
 248 {
 249         int cnt;
 250         wchar_t ch, *p;
 251
 252         for (p = arg, cnt = 0; (ch = *p++); ++arg, ++cnt)
 253                 if (ch == '\\')
 254                         switch(ch = *p++) {
 255                         case 'n':
 256                                 *arg = '\n';
 257                                 break;
 258                         case 't':
 259                                 *arg = '\t';
 260                                 break;
 261                         case '0':
 262                                 *arg = '\0';
 263                                 break;
 264                         default:
 265                                 *arg = ch;
 266                                 break;
 267                 } else
 268                         *arg = ch;
 269
 270         if (!cnt)
 271                 errx(1, "no delimiters specified");
 272         return(cnt);
 273 }
 274
 275 static void
 276 usage(void)
 277 {
 278         (void)fprintf(stderr, "usage: paste [-s] [-d delimiters] file ...\n");
 279         exit(1);
 280 }