133 lines
2.3 KiB
C
133 lines
2.3 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "util.h"
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enum { Suppress1 = 1, Suppress2 = 2, Suppress3 = 4 };
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static void comm(FILE *fp1, const char *s1, FILE *fp2,
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const char *s2, int sflags);
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static void
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usage(void)
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{
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eprintf("usage: %s [-123] file1 file2\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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int sflags = 0;
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FILE *fp1, *fp2;
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ARGBEGIN {
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case '1':
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sflags |= Suppress1;
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break;
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case '2':
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sflags |= Suppress2;
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break;
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case '3':
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sflags |= Suppress3;
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break;
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default:
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usage();
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} ARGEND;
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if (argc < 2)
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usage();
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if (!(fp1 = fopen(argv[0], "r")))
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eprintf("fopen %s:", argv[0]);
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if (!(fp2 = fopen(argv[1], "r")))
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eprintf("fopen %s:", argv[1]);
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comm(fp1, argv[0], fp2, argv[1], sflags);
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return 0;
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}
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static void
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print_col1(const char *s, int sflags)
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{
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if (sflags & Suppress1)
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return;
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printf("%s", s);
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}
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static void
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print_col2(const char *s, int sflags)
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{
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const char *tabs = "\t";
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if (sflags & Suppress1)
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tabs = "";
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if (sflags & Suppress2)
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return;
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printf("%s%s", tabs, s);
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}
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static void
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print_col3(const char *s, int sflags)
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{
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const char *tabs = "\t\t";
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if (sflags & Suppress1)
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tabs = "\t";
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if (sflags & Suppress2)
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tabs = "";
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if (sflags & Suppress3)
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return;
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printf("%s%s", tabs, s);
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}
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static void
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comm(FILE *fp1, const char *s1, FILE *fp2, const char *s2, int sflags)
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{
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char buf1[BUFSIZ], buf2[BUFSIZ];
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bool eof1 = false, eof2 = false;
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bool r1 = true, r2 = true;
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int ret;
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for (;;) {
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if (r1)
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if (!fgets(buf1, sizeof buf1, fp1))
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eof1 = true;
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if (r2)
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if (!fgets(buf2, sizeof buf2, fp2))
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eof2 = true;
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/* If we reached EOF on fp1 then just dump fp2 */
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if (eof1) {
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do {
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print_col2(buf2, sflags);
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} while (fgets(buf2, sizeof buf2, fp2));
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return;
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}
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/* If we reached EOF on fp2 then just dump fp1 */
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if (eof2) {
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do {
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print_col1(buf1, sflags);
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} while (fgets(buf1, sizeof buf1, fp1));
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return;
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}
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ret = strcmp(buf1, buf2);
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if (!ret) {
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r1 = r2 = true;
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print_col3(buf1, sflags);
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continue;
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} else if (ret < 0) {
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r1 = true;
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r2 = false;
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print_col1(buf1, sflags);
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continue;
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} else {
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r1 = false;
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r2 = true;
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print_col2(buf2, sflags);
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continue;
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}
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}
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}
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