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  * @(#) 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: src/usr.bin/paste/paste.c,v 1.6.2.2 2002/07/14 15:16:00 tjr Exp $
  35  * $DragonFly: src/usr.bin/paste/paste.c,v 1.3 2004/12/15 23:11:06 cpressey Exp $
  36  */
  37
  38 #include <sys/types.h>
  39
  40 #include <err.h>
  41 #include <errno.h>
  42 #include <limits.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <string.h>
  46 #include <unistd.h>
  47
  48 char *delim;
  49 int delimcnt;
  50
  51 int parallel(char **);
  52 int sequential(char **);
  53 int tr(char *);
  54 static void usage(void);
  55
  56 char tab[] = "\t";
  57
  58 int
  59 main(int argc, char *argv[])
  60 {
  61         int ch, rval, seq;
  62
  63         seq = 0;
  64         while ((ch = getopt(argc, argv, "d:s")) != -1)
  65                 switch(ch) {
  66                 case 'd':
  67                         delimcnt = tr(delim = optarg);
  68                         break;
  69                 case 's':
  70                         seq = 1;
  71                         break;
  72                 case '?':
  73                 default:
  74                         usage();
  75                 }
  76         argc -= optind;
  77         argv += optind;
  78
  79         if (*argv == NULL)
  80                 usage();
  81         if (!delim) {
  82                 delimcnt = 1;
  83                 delim = tab;
  84         }
  85
  86         if (seq)
  87                 rval = sequential(argv);
  88         else
  89                 rval = parallel(argv);
  90         exit(rval);
  91 }
  92
  93 typedef struct _list {
  94         struct _list *next;
  95         FILE *fp;
  96         int cnt;
  97         char *name;
  98 } LIST;
  99
 100 int
 101 parallel(char **argv)
 102 {
 103         LIST *lp;
 104         int cnt;
 105         char ch, *buf, *p;
 106         LIST *head, *tmp;
 107         int opencnt, output;
 108         size_t len;
 109
 110         tmp = NULL;
 111         for (cnt = 0, head = NULL; (p = *argv); ++argv, ++cnt) {
 112                 if ((lp = malloc(sizeof(LIST))) == NULL)
 113                         err(1, NULL);
 114                 if (p[0] == '-' && !p[1])
 115                         lp->fp = stdin;
 116                 else if (!(lp->fp = fopen(p, "r")))
 117                         err(1, "%s", p);
 118                 lp->next = NULL;
 119                 lp->cnt = cnt;
 120                 lp->name = p;
 121                 if (!head)
 122                         head = tmp = lp;
 123                 else {
 124                         tmp->next = lp;
 125                         tmp = lp;
 126                 }
 127         }
 128
 129         for (opencnt = cnt; opencnt;) {
 130                 for (output = 0, lp = head; lp; lp = lp->next) {
 131                         if (!lp->fp) {
 132                                 if (output && lp->cnt &&
 133                                     (ch = delim[(lp->cnt - 1) % delimcnt]))
 134                                         putchar(ch);
 135                                 continue;
 136                         }
 137                         if ((buf = fgetln(lp->fp, &len)) == NULL) {
 138                                 if (!--opencnt)
 139                                         break;
 140                                 lp->fp = NULL;
 141                                 if (output && lp->cnt &&
 142                                     (ch = delim[(lp->cnt - 1) % delimcnt]))
 143                                         putchar(ch);
 144                                 continue;
 145                         }
 146                         /*
 147                          * make sure that we don't print any delimiters
 148                          * unless there's a non-empty file.
 149                          */
 150                         if (!output) {
 151                                 output = 1;
 152                                 for (cnt = 0; cnt < lp->cnt; ++cnt)
 153                                         if ((ch = delim[cnt % delimcnt]))
 154                                                 putchar(ch);
 155                         } else if ((ch = delim[(lp->cnt - 1) % delimcnt]))
 156                                 putchar(ch);
 157                         if (buf[len - 1] == '\n')
 158                                 len--;
 159                         fwrite(buf, 1, len, stdout);
 160                 }
 161                 if (output)
 162                         putchar('\n');
 163         }
 164
 165         return (0);
 166 }
 167
 168 int
 169 sequential(char **argv)
 170 {
 171         FILE *fp;
 172         int cnt, failed, needdelim;
 173         char *buf, *p;
 174         size_t len;
 175
 176         failed = 0;
 177         for (; (p = *argv); ++argv) {
 178                 if (p[0] == '-' && !p[1])
 179                         fp = stdin;
 180                 else if (!(fp = fopen(p, "r"))) {
 181                         warn("%s", p);
 182                         failed = 1;
 183                         continue;
 184                 }
 185                 cnt = needdelim = 0;
 186                 while ((buf = fgetln(fp, &len)) != NULL) {
 187                         if (needdelim) {
 188                                 needdelim = 0;
 189                                 if (delim[cnt] != '\0')
 190                                         putchar(delim[cnt]);
 191                                 if (++cnt == delimcnt)
 192                                         cnt = 0;
 193                         }
 194                         if (buf[len - 1] == '\n')
 195                                 len--;
 196                         fwrite(buf, 1, len, stdout);
 197                         needdelim = 1;
 198                 }
 199                 if (needdelim)
 200                         putchar('\n');
 201                 if (fp != stdin)
 202                         (void)fclose(fp);
 203         }
 204
 205         return (failed != 0);
 206 }
 207
 208 int
 209 tr(char *arg)
 210 {
 211         int cnt;
 212         char ch, *p;
 213
 214         for (p = arg, cnt = 0; (ch = *p++); ++arg, ++cnt)
 215                 if (ch == '\\')
 216                         switch(ch = *p++) {
 217                         case 'n':
 218                                 *arg = '\n';
 219                                 break;
 220                         case 't':
 221                                 *arg = '\t';
 222                                 break;
 223                         case '0':
 224                                 *arg = '\0';
 225                                 break;
 226                         default:
 227                                 *arg = ch;
 228                                 break;
 229                 } else
 230                         *arg = ch;
 231
 232         if (!cnt)
 233                 errx(1, "no delimiters specified");
 234         return(cnt);
 235 }
 236
 237 static void
 238 usage(void)
 239 {
 240         (void)fprintf(stderr, "usage: paste [-s] [-d delimiters] file ...\n");
 241         exit(1);
 242 }