diff options
Diffstat (limited to 'usr.bin/comm/comm.c')
| -rw-r--r-- | usr.bin/comm/comm.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/usr.bin/comm/comm.c b/usr.bin/comm/comm.c new file mode 100644 index 0000000..8ffbbb5 --- /dev/null +++ b/usr.bin/comm/comm.c @@ -0,0 +1,186 @@ +/* + * 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. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. 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. + */ + +#ifndef lint +static char copyright[] = +"@(#) Copyright (c) 1989, 1993, 1994\n\ + The Regents of the University of California. All rights reserved.\n"; +#endif /* not lint */ + +#ifndef lint +static char sccsid[] = "@(#)comm.c 8.3 (Berkeley) 4/2/94"; +#endif /* not lint */ + +#include <fcntl.h> +#include <limits.h> +#include <errno.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +#define MAXLINELEN (LINE_MAX + 1) + +char *tabs[] = { "", "\t", "\t\t" }; + +FILE *file __P((char *)); +void show __P((FILE *, char *, char *)); +void usage __P((void)); + +int +main(argc, argv) + int argc; + char *argv[]; +{ + int comp, file1done, file2done, read1, read2; + int ch, flag1, flag2, flag3; + FILE *fp1, *fp2; + char *col1, *col2, *col3; + char **p, line1[MAXLINELEN], line2[MAXLINELEN]; + + flag1 = flag2 = flag3 = 1; + while ((ch = getopt(argc, argv, "-123")) != EOF) + switch(ch) { + case '-': + --optind; + goto done; + case '1': + flag1 = 0; + break; + case '2': + flag2 = 0; + break; + case '3': + flag3 = 0; + break; + case '?': + default: + usage(); + } +done: 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 = !fgets(line1, MAXLINELEN, fp1); + if (read2) + file2done = !fgets(line2, MAXLINELEN, 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 = strcmp(line1, line2))) { + read1 = read2 = 1; + if (col3) + (void)printf("%s%s", col3, line1); + continue; + } + + /* lines are different */ + if (comp < 0) { + read1 = 1; + read2 = 0; + if (col1) + (void)printf("%s%s", col1, line1); + } else { + read1 = 0; + read2 = 1; + if (col2) + (void)printf("%s%s", col2, line2); + } + } + exit(0); +} + +void +show(fp, offset, buf) + FILE *fp; + char *offset, *buf; +{ + + do { + (void)printf("%s%s", offset, buf); + } while (fgets(buf, MAXLINELEN, fp)); +} + +FILE * +file(name) + char *name; +{ + FILE *fp; + + if (!strcmp(name, "-")) + return (stdin); + if ((fp = fopen(name, "r")) == NULL) { + (void)fprintf(stderr, "comm: %s: %s\n", name, strerror(errno)); + exit(1); + } + return (fp); +} + +void +usage() +{ + + (void)fprintf(stderr, "usage: comm [-123] file1 file2\n"); + exit(1); +} |
