usr.bin/paste/paste.c

   1 /*      $NetBSD: paste.c,v 1.16 2011/09/06 18:24:43 joerg Exp $ */
   2
   3 /*
   4  * Copyright (c) 1989, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Adam S. Moskowitz of Menlo Consulting.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #ifndef lint
  37 __COPYRIGHT("@(#) Copyright (c) 1989, 1993\
  38  The Regents of the University of California.  All rights reserved.");
  39 #endif /* not lint */
  40
  41 #ifndef lint
  42 /*static char sccsid[] = "from: @(#)paste.c     8.1 (Berkeley) 6/6/93";*/
  43 __RCSID("$NetBSD: paste.c,v 1.16 2011/09/06 18:24:43 joerg Exp $");
  44 #endif /* not lint */
  45
  46 #include <sys/types.h>
  47 #include <err.h>
  48 #include <errno.h>
  49 #include <limits.h>
  50 #include <stdio.h>
  51 #include <stdlib.h>
  52 #include <string.h>
  53 #include <unistd.h>
  54
  55 static void     parallel(int, char **);
  56 static void     sequential(char **);
  57 static int      tr(char *);
  58 __dead static void      usage(void);
  59
  60 static char dflt_delim[] = "\t";
  61 static char *delim = dflt_delim;
  62 static int delimcnt = 1;
  63
  64 int
  65 main(int argc, char **argv)
  66 {
  67         int ch, seq;
  68
  69         seq = 0;
  70         while ((ch = getopt(argc, argv, "d:s")) != -1) {
  71                 switch (ch) {
  72                 case 'd':
  73                         delim = strdup(optarg);
  74                         delimcnt = tr(delim);
  75                         break;
  76                 case 's':
  77                         seq = 1;
  78                         break;
  79                 case '?':
  80                 default:
  81                         usage();
  82                 }
  83         }
  84         argc -= optind;
  85         argv += optind;
  86
  87         if (seq)
  88                 sequential(argv);
  89         else
  90                 parallel(argc, argv);
  91         exit(0);
  92 }
  93
  94 static void
  95 parallel(int argc, char **argv)
  96 {
  97         char ch, *dp, *line;
  98         FILE **fpp, *fp;
  99         size_t line_len;
 100         int cnt, output;
 101
 102         fpp = calloc(argc, sizeof *fpp);
 103         if (fpp == NULL)
 104                 err(1, "calloc");
 105
 106         for (cnt = 0; cnt < argc; cnt++) {
 107                 if (strcmp(argv[cnt], "-") == 0)
 108                         fpp[cnt] = stdin;
 109                 else if (!(fpp[cnt] = fopen(argv[cnt], "r")))
 110                         err(1, "%s", argv[cnt]);
 111         }
 112
 113         for (;;) {
 114                 /* Start with the NUL at the end of 'delim' ... */
 115                 dp = delim + delimcnt;
 116                 output = 0;
 117                 for (cnt = 0; cnt < argc; cnt++) {
 118                         fp = fpp[cnt];
 119                         if (fp == NULL)
 120                                 continue;
 121                         line = fgetln(fp, &line_len);
 122                         if (line == NULL) {
 123                                 /* Assume EOF */
 124                                 if (fp != stdin)
 125                                         fclose(fp);
 126                                 fpp[cnt] = NULL;
 127                                 continue;
 128                         }
 129                         /* Output enough separators to catch up */
 130                         do {
 131                                 ch = *dp++;
 132                                 if (ch)
 133                                         putchar(ch);
 134                                 if (dp >= delim + delimcnt)
 135                                         dp = delim;
 136                         } while (++output <= cnt);
 137                         /* Remove any trailing newline - check for last line */
 138                         if (line[line_len - 1] == '\n')
 139                                 line_len--;
 140                         printf("%.*s", (int)line_len, line);
 141                 }
 142
 143                 if (!output)
 144                         break;
 145
 146                 /* Add separators to end of line */
 147                 while (++output <= cnt) {
 148                         ch = *dp++;
 149                         if (ch)
 150                                 putchar(ch);
 151                         if (dp >= delim + delimcnt)
 152                                 dp = delim;
 153                 }
 154                 putchar('\n');
 155         }
 156
 157         free(fpp);
 158 }
 159
 160 static void
 161 sequential(char **argv)
 162 {
 163         FILE *fp;
 164         int cnt;
 165         char ch, *p, *dp;
 166         char buf[_POSIX2_LINE_MAX + 1];
 167
 168         for (; (p = *argv) != NULL; ++argv) {
 169                 if (p[0] == '-' && !p[1])
 170                         fp = stdin;
 171                 else if (!(fp = fopen(p, "r"))) {
 172                         warn("%s", p);
 173                         continue;
 174                 }
 175                 if (fgets(buf, sizeof(buf), fp)) {
 176                         for (cnt = 0, dp = delim;;) {
 177                                 if (!(p = strchr(buf, '\n')))
 178                                         err(1, "%s: input line too long.",
 179                                             *argv);
 180                                 *p = '\0';
 181                                 (void)printf("%s", buf);
 182                                 if (!fgets(buf, sizeof(buf), fp))
 183                                         break;
 184                                 if ((ch = *dp++) != 0)
 185                                         putchar(ch);
 186                                 if (++cnt == delimcnt) {
 187                                         dp = delim;
 188                                         cnt = 0;
 189                                 }
 190                         }
 191                         putchar('\n');
 192                 }
 193                 if (fp != stdin)
 194                         (void)fclose(fp);
 195         }
 196 }
 197
 198 static int
 199 tr(char *arg)
 200 {
 201         int cnt;
 202         char ch, *p;
 203
 204         for (p = arg, cnt = 0; (ch = *p++); ++arg, ++cnt)
 205                 if (ch == '\\')
 206                         switch(ch = *p++) {
 207                         case 'n':
 208                                 *arg = '\n';
 209                                 break;
 210                         case 't':
 211                                 *arg = '\t';
 212                                 break;
 213                         case '0':
 214                                 *arg = '\0';
 215                                 break;
 216                         default:
 217                                 *arg = ch;
 218                                 break;
 219                 } else
 220                         *arg = ch;
 221
 222         if (!cnt)
 223                 errx(1, "no delimiters specified.");
 224         *arg = '\0';
 225         return(cnt);
 226 }
 227
 228 static void
 229 usage(void)
 230 {
 231         (void)fprintf(stderr, "paste: [-s] [-d delimiters] file ...\n");
 232         exit(1);
 233 }