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. 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  * @(#) Copyright (c) 1989, 1993 The Regents of the University of California.  All rights reserved.
  37  * @(#)paste.c  8.1 (Berkeley) 6/6/93
  38  * $FreeBSD: src/usr.bin/paste/paste.c,v 1.6.2.2 2002/07/14 15:16:00 tjr Exp $
  39  * $DragonFly: src/usr.bin/paste/paste.c,v 1.3 2004/12/15 23:11:06 cpressey Exp $
  40  */
  41
  42 #include <sys/types.h>
  43
  44 #include <err.h>
  45 #include <errno.h>
  46 #include <limits.h>
  47 #include <stdio.h>
  48 #include <stdlib.h>
  49 #include <string.h>
  50 #include <unistd.h>
  51
  52 char *delim;
  53 int delimcnt;
  54
  55 int parallel(char **);
  56 int sequential(char **);
  57 int tr(char *);
  58 static void usage(void);
  59
  60 char tab[] = "\t";
  61
  62 int
  63 main(int argc, char *argv[])
  64 {
  65         int ch, rval, seq;
  66
  67         seq = 0;
  68         while ((ch = getopt(argc, argv, "d:s")) != -1)
  69                 switch(ch) {
  70                 case 'd':
  71                         delimcnt = tr(delim = optarg);
  72                         break;
  73                 case 's':
  74                         seq = 1;
  75                         break;
  76                 case '?':
  77                 default:
  78                         usage();
  79                 }
  80         argc -= optind;
  81         argv += optind;
  82
  83         if (*argv == NULL)
  84                 usage();
  85         if (!delim) {
  86                 delimcnt = 1;
  87                 delim = tab;
  88         }
  89
  90         if (seq)
  91                 rval = sequential(argv);
  92         else
  93                 rval = parallel(argv);
  94         exit(rval);
  95 }
  96
  97 typedef struct _list {
  98         struct _list *next;
  99         FILE *fp;
 100         int cnt;
 101         char *name;
 102 } LIST;
 103
 104 int
 105 parallel(char **argv)
 106 {
 107         LIST *lp;
 108         int cnt;
 109         char ch, *buf, *p;
 110         LIST *head, *tmp;
 111         int opencnt, output;
 112         size_t len;
 113
 114         tmp = NULL;
 115         for (cnt = 0, head = NULL; (p = *argv); ++argv, ++cnt) {
 116                 if ((lp = malloc(sizeof(LIST))) == NULL)
 117                         err(1, NULL);
 118                 if (p[0] == '-' && !p[1])
 119                         lp->fp = stdin;
 120                 else if (!(lp->fp = fopen(p, "r")))
 121                         err(1, "%s", p);
 122                 lp->next = NULL;
 123                 lp->cnt = cnt;
 124                 lp->name = p;
 125                 if (!head)
 126                         head = tmp = lp;
 127                 else {
 128                         tmp->next = lp;
 129                         tmp = lp;
 130                 }
 131         }
 132
 133         for (opencnt = cnt; opencnt;) {
 134                 for (output = 0, lp = head; lp; lp = lp->next) {
 135                         if (!lp->fp) {
 136                                 if (output && lp->cnt &&
 137                                     (ch = delim[(lp->cnt - 1) % delimcnt]))
 138                                         putchar(ch);
 139                                 continue;
 140                         }
 141                         if ((buf = fgetln(lp->fp, &len)) == NULL) {
 142                                 if (!--opencnt)
 143                                         break;
 144                                 lp->fp = NULL;
 145                                 if (output && lp->cnt &&
 146                                     (ch = delim[(lp->cnt - 1) % delimcnt]))
 147                                         putchar(ch);
 148                                 continue;
 149                         }
 150                         /*
 151                          * make sure that we don't print any delimiters
 152                          * unless there's a non-empty file.
 153                          */
 154                         if (!output) {
 155                                 output = 1;
 156                                 for (cnt = 0; cnt < lp->cnt; ++cnt)
 157                                         if ((ch = delim[cnt % delimcnt]))
 158                                                 putchar(ch);
 159                         } else if ((ch = delim[(lp->cnt - 1) % delimcnt]))
 160                                 putchar(ch);
 161                         if (buf[len - 1] == '\n')
 162                                 len--;
 163                         fwrite(buf, 1, len, stdout);
 164                 }
 165                 if (output)
 166                         putchar('\n');
 167         }
 168
 169         return (0);
 170 }
 171
 172 int
 173 sequential(char **argv)
 174 {
 175         FILE *fp;
 176         int cnt, failed, needdelim;
 177         char *buf, *p;
 178         size_t len;
 179
 180         failed = 0;
 181         for (; (p = *argv); ++argv) {
 182                 if (p[0] == '-' && !p[1])
 183                         fp = stdin;
 184                 else if (!(fp = fopen(p, "r"))) {
 185                         warn("%s", p);
 186                         failed = 1;
 187                         continue;
 188                 }
 189                 cnt = needdelim = 0;
 190                 while ((buf = fgetln(fp, &len)) != NULL) {
 191                         if (needdelim) {
 192                                 needdelim = 0;
 193                                 if (delim[cnt] != '\0')
 194                                         putchar(delim[cnt]);
 195                                 if (++cnt == delimcnt)
 196                                         cnt = 0;
 197                         }
 198                         if (buf[len - 1] == '\n')
 199                                 len--;
 200                         fwrite(buf, 1, len, stdout);
 201                         needdelim = 1;
 202                 }
 203                 if (needdelim)
 204                         putchar('\n');
 205                 if (fp != stdin)
 206                         (void)fclose(fp);
 207         }
 208
 209         return (failed != 0);
 210 }
 211
 212 int
 213 tr(char *arg)
 214 {
 215         int cnt;
 216         char ch, *p;
 217
 218         for (p = arg, cnt = 0; (ch = *p++); ++arg, ++cnt)
 219                 if (ch == '\\')
 220                         switch(ch = *p++) {
 221                         case 'n':
 222                                 *arg = '\n';
 223                                 break;
 224                         case 't':
 225                                 *arg = '\t';
 226                                 break;
 227                         case '0':
 228                                 *arg = '\0';
 229                                 break;
 230                         default:
 231                                 *arg = ch;
 232                                 break;
 233                 } else
 234                         *arg = ch;
 235
 236         if (!cnt)
 237                 errx(1, "no delimiters specified");
 238         return(cnt);
 239 }
 240
 241 static void
 242 usage(void)
 243 {
 244         (void)fprintf(stderr, "usage: paste [-s] [-d delimiters] file ...\n");
 245         exit(1);
 246 }