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	comm.c - sbase - suckless unix tools
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	---
	comm.c (1863B)
	---
	1 /* See LICENSE file for copyright and license details. */
	2 #include <stdio.h>
	3 #include <stdlib.h>
	4 #include <string.h>
	5
	6 #include "text.h"
	7 #include "util.h"
	8
	9 static int show = 0x07;
	10
	11 static void
	12 printline(int pos, struct line *line)
	13 {
	14 int i;
	15
	16 if (!(show & (0x1 << pos)))
	17 return;
	18
	19 for (i = 0; i < pos; i++) {
	20 if (show & (0x1 << i))
	21 putchar('\t');
	22 }
	23 fwrite(line->data, 1, line->len, stdout);
	24 }
	25
	26 static void
	27 usage(void)
	28 {
	29 eprintf("usage: %s [-123] file1 file2\n", argv0);
	30 }
	31
	32 int
	33 main(int argc, char *argv[])
	34 {
	35 FILE *fp[2];
	36 static struct line line[2];
	37 size_t linecap[2] = { 0, 0 };
	38 ssize_t len;
	39 int ret = 0, i, diff = 0, seenline = 0;
	40
	41 ARGBEGIN {
	42 case '1':
	43 case '2':
	44 case '3':
	45 show &= 0x07 ^ (1 << (ARGC() - '1'));
	46 break;
	47 default:
	48 usage();
	49 } ARGEND
	50
	51 if (argc != 2)
	52 usage();
	53
	54 for (i = 0; i < 2; i++) {
	55 if (!strcmp(argv[i], "-")) {
	56 argv[i] = "<stdin>";
	57 fp[i] = stdin;
	58 } else if (!(fp[i] = fopen(argv[i], "r"))) {
	59 eprintf("fopen %s:", argv[i]);
	60 }
	61 }
	62
	63 for (;;) {
	64 for (i = 0; i < 2; i++) {
	65 if (diff && i == (diff < 0))
	66 continue;
	67 if ((len = getline(&(line[i].data), &linecap[i],
	68 fp[i])) > 0) {
	69 line[i].len = len;
	70 seenline = 1;
	71 continue;
	72 }
	73 if (ferror(fp[i]))
	74 eprintf("getline %s:", argv[i]);
	75 if ((diff \|\| seenline) && line[!i].data[0])
	76 printline(!i, &line[!i]);
	77 while ((len = getline(&(line[!i].data), &linecap…
	78 fp[!i])) > 0) {
	79 line[!i].len = len;
	80 printline(!i, &line[!i]);
	81 }
	82 if (ferror(fp[!i]))
	83 eprintf("getline %s:", argv[!i]);
	84 goto end;
	85 }
	86 diff = linecmp(&line[0], &line[1]);
	87 LIMIT(diff, -1, 1);
	88 seenline = 0;
	89 printline((2 - diff) % 3, &line[MAX(0, diff)]);
	90 }
	91 end:
	92 ret \|= fshut(fp[0], argv[0]);
	93 ret \|= (fp[0] != fp[1]) && fshut(fp[1], argv[1]);
	94 ret \|= fshut(stdout, "<stdout>");
	95
	96 return ret;
	97 }