1 3b0f3d61 2020-01-22 neels /* Common parts for printing diff output */
 2 3b0f3d61 2020-01-22 neels /*
 3 3b0f3d61 2020-01-22 neels  * Copyright (c) 2020 Neels Hofmeyr <neels@hofmeyr.de>
 4 3b0f3d61 2020-01-22 neels  *
 5 3b0f3d61 2020-01-22 neels  * Permission to use, copy, modify, and distribute this software for any
 6 3b0f3d61 2020-01-22 neels  * purpose with or without fee is hereby granted, provided that the above
 7 3b0f3d61 2020-01-22 neels  * copyright notice and this permission notice appear in all copies.
 8 3b0f3d61 2020-01-22 neels  *
 9 3b0f3d61 2020-01-22 neels  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
10 3b0f3d61 2020-01-22 neels  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
11 3b0f3d61 2020-01-22 neels  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
12 3b0f3d61 2020-01-22 neels  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
13 3b0f3d61 2020-01-22 neels  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
14 3b0f3d61 2020-01-22 neels  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
15 3b0f3d61 2020-01-22 neels  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 3b0f3d61 2020-01-22 neels  */
17 3b0f3d61 2020-01-22 neels 
18 e10a628a 2020-09-16 stsp #include <inttypes.h>
19 e10a628a 2020-09-16 stsp #include <stdbool.h>
20 e10a628a 2020-09-16 stsp #include <stdio.h>
21 e10a628a 2020-09-16 stsp #include <stdlib.h>
22 c6eecea3 2020-07-26 stsp #include <unistd.h>
23 c6eecea3 2020-07-26 stsp 
24 e10a628a 2020-09-16 stsp #include <diff/arraylist.h>
25 e10a628a 2020-09-16 stsp #include <diff/diff_main.h>
26 3b0f3d61 2020-01-22 neels #include <diff/diff_output.h>
27 3b0f3d61 2020-01-22 neels 
28 c6eecea3 2020-07-26 stsp static char
29 c6eecea3 2020-07-26 stsp get_atom_byte(struct diff_atom *atom, off_t off)
30 c6eecea3 2020-07-26 stsp {
31 c6eecea3 2020-07-26 stsp 	char ch;
32 c6eecea3 2020-07-26 stsp 	off_t cur;
33 c6eecea3 2020-07-26 stsp 
34 c6eecea3 2020-07-26 stsp 	if (atom->at != NULL)
35 c6eecea3 2020-07-26 stsp 		return atom->at[off];
36 c6eecea3 2020-07-26 stsp 
37 c6eecea3 2020-07-26 stsp 	cur = lseek(atom->d->root->fd, 0, SEEK_CUR);
38 c6eecea3 2020-07-26 stsp 	if (cur == -1)
39 c6eecea3 2020-07-26 stsp 		abort(); /* XXX cannot return error */
40 c6eecea3 2020-07-26 stsp 
41 c6eecea3 2020-07-26 stsp 	if (cur != atom->pos + off &&
42 c6eecea3 2020-07-26 stsp 	    lseek(atom->d->root->fd, atom->pos + off, SEEK_SET) == -1)
43 c6eecea3 2020-07-26 stsp 		abort(); /* XXX cannot return error */
44 c6eecea3 2020-07-26 stsp 
45 c6eecea3 2020-07-26 stsp 	if (read(atom->d->root->fd, &ch, sizeof(ch)) == -1)
46 c6eecea3 2020-07-26 stsp 		abort(); /* XXX cannot return error */
47 c6eecea3 2020-07-26 stsp 
48 c6eecea3 2020-07-26 stsp 	return ch;
49 c6eecea3 2020-07-26 stsp }
50 c6eecea3 2020-07-26 stsp 
51 61a7b578 2020-05-06 neels void
52 0d27172a 2020-05-06 neels diff_output_lines(FILE *dest, const char *prefix, struct diff_atom *start_atom,
53 0d27172a 2020-05-06 neels 		  unsigned int count)
54 3b0f3d61 2020-01-22 neels {
55 3b0f3d61 2020-01-22 neels 	struct diff_atom *atom;
56 3b0f3d61 2020-01-22 neels 	foreach_diff_atom(atom, start_atom, count) {
57 3b0f3d61 2020-01-22 neels 		fprintf(dest, "%s", prefix);
58 3b0f3d61 2020-01-22 neels 		int i;
59 3b0f3d61 2020-01-22 neels 		unsigned int len = atom->len;
60 c6eecea3 2020-07-26 stsp 		if (len) {
61 c6eecea3 2020-07-26 stsp 			char ch;
62 c6eecea3 2020-07-26 stsp 			ch = get_atom_byte(atom, len - 1);
63 c6eecea3 2020-07-26 stsp 			if (ch == '\n')
64 3b0f3d61 2020-01-22 neels 				len--;
65 c6eecea3 2020-07-26 stsp 			if (len) {
66 c6eecea3 2020-07-26 stsp 				ch = get_atom_byte(atom, len - 1);
67 c6eecea3 2020-07-26 stsp 				if (ch == '\r')
68 c6eecea3 2020-07-26 stsp 					len--;
69 c6eecea3 2020-07-26 stsp 			}
70 3b0f3d61 2020-01-22 neels 		}
71 3b0f3d61 2020-01-22 neels 
72 3b0f3d61 2020-01-22 neels 		for (i = 0; i < len; i++) {
73 c6eecea3 2020-07-26 stsp 			char c = get_atom_byte(atom, i);
74 fbd55577 2020-01-27 neels 			if ((c < 0x20 || c >= 0x7f) && c != '\t')
75 3b0f3d61 2020-01-22 neels 				fprintf(dest, "\\x%02x", (unsigned char)c);
76 3b0f3d61 2020-01-22 neels 			else
77 3b0f3d61 2020-01-22 neels 				fprintf(dest, "%c", c);
78 3b0f3d61 2020-01-22 neels 		}
79 3b0f3d61 2020-01-22 neels 		fprintf(dest, "\n");
80 3b0f3d61 2020-01-22 neels 	}
81 3b0f3d61 2020-01-22 neels }