paste.c (6048B)
- /*-
- * SPDX-License-Identifier: BSD-3-Clause
- *
- * Copyright (c) 1989, 1993
- * The Regents of the University of California. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Adam S. Moskowitz of Menlo Consulting.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- * 3. Neither the name of the University nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
- #include <err.h>
- #include <errno.h>
- #include <limits.h>
- #include <locale.h>
- #include <stdint.h> // SIZE_MAX
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <sys/types.h>
- #include <unistd.h>
- #include <wchar.h>
- static wchar_t *delim;
- static int delimcnt;
- static wint_t linedelim = L'\n';
- static wchar_t tab[] = L"\t";
- const char *argv0 = "paste";
- typedef struct _list
- {
- struct _list *next;
- FILE *fp;
- int cnt;
- char *name;
- } LIST;
- static int
- parallel(char **argv)
- {
- LIST *lp;
- int cnt;
- wint_t ich;
- wchar_t ch;
- char *p;
- LIST *head, *tmp;
- int opencnt, output;
- for(cnt = 0, head = tmp = NULL; (p = *argv); ++argv, ++cnt)
- {
- if((lp = malloc(sizeof(LIST))) == NULL) err(1, NULL);
- if(p[0] == '-' && !p[1])
- lp->fp = stdin;
- else if(!(lp->fp = fopen(p, "r")))
- err(1, "error: %s", p);
- lp->next = NULL;
- lp->cnt = cnt;
- lp->name = p;
- if(!head)
- head = tmp = lp;
- else
- {
- tmp->next = lp;
- tmp = lp;
- }
- }
- for(opencnt = cnt; opencnt;)
- {
- for(output = 0, lp = head; lp; lp = lp->next)
- {
- if(!lp->fp)
- {
- if(output && lp->cnt && (ch = delim[(lp->cnt - 1) % delimcnt])) putwchar(ch);
- continue;
- }
- if((ich = getwc(lp->fp)) == WEOF)
- {
- if(!--opencnt) break;
- lp->fp = NULL;
- if(output && lp->cnt && (ch = delim[(lp->cnt - 1) % delimcnt])) putwchar(ch);
- continue;
- }
- /*
- * make sure that we don't print any delimiters
- * unless there's a non-empty file.
- */
- if(!output)
- {
- output = 1;
- for(cnt = 0; cnt < lp->cnt; ++cnt)
- if((ch = delim[cnt % delimcnt])) putwchar(ch);
- }
- else if((ch = delim[(lp->cnt - 1) % delimcnt]))
- putwchar(ch);
- if(ich == linedelim) continue;
- do
- {
- putwchar(ich);
- } while((ich = getwc(lp->fp)) != WEOF && ich != linedelim);
- }
- if(output) putwchar(linedelim);
- }
- return (0);
- }
- static int
- sequential(char **argv)
- {
- FILE *fp;
- int cnt, failed, needdelim;
- wint_t ch;
- char *p;
- failed = 0;
- for(; (p = *argv); ++argv)
- {
- if(p[0] == '-' && !p[1])
- fp = stdin;
- else if(!(fp = fopen(p, "r")))
- {
- warn("%s", p);
- failed = 1;
- continue;
- }
- cnt = needdelim = 0;
- while((ch = getwc(fp)) != WEOF)
- {
- if(needdelim)
- {
- needdelim = 0;
- if(delim[cnt] != '\0') putwchar(delim[cnt]);
- if(++cnt == delimcnt) cnt = 0;
- }
- if(ch != linedelim)
- putwchar(ch);
- else
- needdelim = 1;
- }
- if(needdelim) putwchar(linedelim);
- if(fp != stdin) (void)fclose(fp);
- }
- return (failed != 0);
- }
- static int
- tr(wchar_t *arg)
- {
- int cnt;
- wchar_t ch, *p;
- for(p = arg, cnt = 0; (ch = *p++); ++arg, ++cnt)
- if(ch == '\\') switch(ch = *p++)
- {
- case 'n':
- *arg = '\n';
- break;
- case 't':
- *arg = '\t';
- break;
- case '0':
- *arg = '\0';
- break;
- default:
- *arg = ch;
- break;
- }
- else
- *arg = ch;
- if(!cnt) errx(1, "error: no delimiters specified");
- return (cnt);
- }
- static void
- usage(void)
- {
- (void)fprintf(stderr, "usage: paste [-sz] [-d delimiters] [file...]\n");
- exit(1);
- }
- int
- main(int argc, char *argv[])
- {
- errno = 0;
- setlocale(LC_ALL, "");
- if(errno != 0)
- {
- fprintf(stderr, "%s: warning: Failed to initialize locales: %s\n", argv0, strerror(errno));
- errno = 0;
- }
- int c = -1, seq = 0;
- while((c = getopt(argc, argv, ":d:sz")) != -1)
- {
- switch(c)
- {
- case 'd':
- {
- const char *arg = optarg;
- size_t len = mbsrtowcs(NULL, &arg, 0, NULL);
- if(len == (size_t)-1) err(1, "error: delimiters");
- if(len == SIZE_MAX) err(1, NULL);
- wchar_t *warg = calloc((len + 1), sizeof(*warg));
- if(warg == NULL) err(1, NULL);
- arg = optarg;
- len = mbsrtowcs(warg, &arg, len + 1, NULL);
- if(len == (size_t)-1) err(1, "error: delimiters");
- delimcnt = tr(delim = warg);
- break;
- }
- case 's':
- seq = 1;
- break;
- case 'z':
- linedelim = L'\0';
- break;
- case ':':
- fprintf(stderr, "%s: error: Missing operand for option: '-%c'\n", argv0, optopt);
- usage();
- return 1;
- case '?':
- fprintf(stderr, "%s: error: Unrecognised option: '-%c'\n", argv0, optopt);
- usage();
- return 1;
- default:
- abort();
- }
- }
- argc -= optind;
- argv += optind;
- char *dash[] = {(char *)"-", NULL};
- char **args = argc > 0 ? argv : dash;
- if(!delim)
- {
- delimcnt = 1;
- delim = tab;
- }
- if(seq)
- return sequential(args);
- else
- return parallel(args);
- }