diff options
Diffstat (limited to 'usr.bin/comm/comm.c')
| -rw-r--r-- | usr.bin/comm/comm.c | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/usr.bin/comm/comm.c b/usr.bin/comm/comm.c new file mode 100644 index 0000000..c1416e2 --- /dev/null +++ b/usr.bin/comm/comm.c @@ -0,0 +1,213 @@ +/* $NetBSD: comm.c,v 1.20 2012/09/05 04:01:23 simonb Exp $ */ + +/* + * Copyright (c) 1989, 1993, 1994 + * The Regents of the University of California. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Case Larsen. + * + * 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 <sys/cdefs.h> +#ifndef lint +__COPYRIGHT("@(#) Copyright (c) 1989, 1993, 1994\ + The Regents of the University of California. All rights reserved."); +#endif /* not lint */ + +#ifndef lint +#if 0 +static char sccsid[] = "@(#)comm.c 8.4 (Berkeley) 5/4/95"; +#endif +__RCSID("$NetBSD: comm.c,v 1.20 2012/09/05 04:01:23 simonb Exp $"); +#endif /* not lint */ + +#include <err.h> +#include <limits.h> +#include <locale.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#define MAXLINELEN (LINE_MAX + 1) + +static const char *tabs[] = { "", "\t", "\t\t" }; + +static FILE *file(const char *); +static void show(FILE *, const char *, char *); +__dead static void usage(void); +static char *getnextln(char *buf, FILE *); + +int +main(int argc, char **argv) +{ + int comp, file1done, file2done, read1, read2; + int ch, flag1, flag2, flag3; + FILE *fp1, *fp2; + const char *col1, *col2, *col3, **p; + char line1[MAXLINELEN], line2[MAXLINELEN]; + int (*compare)(const char*,const char*); + + (void)setlocale(LC_ALL, ""); + + file1done = file2done = 0; + flag1 = flag2 = flag3 = 1; + compare = strcoll; + while ((ch = getopt(argc, argv, "123f")) != -1) + switch(ch) { + case '1': + flag1 = 0; + break; + case '2': + flag2 = 0; + break; + case '3': + flag3 = 0; + break; + case 'f': + compare = strcasecmp; + break; + case '?': + default: + usage(); + } + argc -= optind; + argv += optind; + + if (argc != 2) + usage(); + + fp1 = file(argv[0]); + fp2 = file(argv[1]); + + /* for each column printed, add another tab offset */ + p = tabs; + col1 = col2 = col3 = NULL; + if (flag1) + col1 = *p++; + if (flag2) + col2 = *p++; + if (flag3) + col3 = *p; + + for (read1 = read2 = 1;;) { + /* read next line, check for EOF */ + if (read1) + file1done = !getnextln(line1, fp1); + if (read2) + file2done = !getnextln(line2, fp2); + + /* if one file done, display the rest of the other file */ + if (file1done) { + if (!file2done && col2) + show(fp2, col2, line2); + break; + } + if (file2done) { + if (!file1done && col1) + show(fp1, col1, line1); + break; + } + + /* lines are the same */ + if (!(comp = compare(line1, line2))) { + read1 = read2 = 1; + if (col3) + if (printf("%s%s\n", col3, line1) < 0) + break; + continue; + } + + /* lines are different */ + if (comp < 0) { + read1 = 1; + read2 = 0; + if (col1) + if (printf("%s%s\n", col1, line1) < 0) + break; + } else { + read1 = 0; + read2 = 1; + if (col2) + if (printf("%s%s\n", col2, line2) < 0) + break; + } + } + + if (ferror (stdout) || fclose (stdout) == EOF) + err(1, "stdout"); + + exit(0); +} + +static void +show(FILE *fp, const char *offset, char *buf) +{ + while (printf("%s%s\n", offset, buf) >= 0 && getnextln(buf, fp)) + ; +} + +static FILE * +file(const char *name) +{ + FILE *fp; + + if (!strcmp(name, "-")) + return (stdin); + if ((fp = fopen(name, "r")) == NULL) + err(1, "%s", name); + return (fp); +} + +static void +usage(void) +{ + + (void)fprintf(stderr, "usage: comm [-123f] file1 file2\n"); + exit(1); +} + +static char * +getnextln(char *buf, FILE *fp) +{ + size_t i = 0; + int c; + + while ((c = getc(fp)) != '\n' && c != EOF) { + buf[i++] = c; + + if (i >= MAXLINELEN) + i--; /* consumes extra characters till newline */ + } + + if (c == EOF && !i) + return NULL; + + buf[i] = 0; + return buf; +} + |