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st.c (55789B)

    

  1. /* See LICENSE for license details. */
  2. #include <ctype.h>
  3. #include <errno.h>
  4. #include <fcntl.h>
  5. #include <limits.h>
  6. #include <pwd.h>
  7. #include <stdarg.h>
  8. #include <stdio.h>
  9. #include <stdlib.h>
  10. #include <string.h>
  11. #include <signal.h>
  12. #include <sys/ioctl.h>
  13. #include <sys/select.h>
  14. #include <sys/types.h>
  15. #include <sys/wait.h>
  16. #include <termios.h>
  17. #include <unistd.h>
  18. #include <wchar.h>
  20. #include "st.h"
  21. #include "win.h"
  23. #if   defined(__linux)
  24.  #include <pty.h>
  25. #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__)
  26.  #include <util.h>
  27. #elif defined(__FreeBSD__) || defined(__DragonFly__)
  28.  #include <libutil.h>
  29. #endif
  31. /* Arbitrary sizes */
  32. #define UTF_INVALID   0xFFFD
  33. #define UTF_SIZ       4
  34. #define ESC_BUF_SIZ   (128*UTF_SIZ)
  35. #define ESC_ARG_SIZ   16
  36. #define STR_BUF_SIZ   ESC_BUF_SIZ
  37. #define STR_ARG_SIZ   ESC_ARG_SIZ
  39. /* macros */
  40. #define IS_SET(flag)		((term.mode & (flag)) != 0)
  41. #define ISCONTROLC0(c)		(BETWEEN(c, 0, 0x1f) || (c) == 0x7f)
  42. #define ISCONTROLC1(c)		(BETWEEN(c, 0x80, 0x9f))
  43. #define ISCONTROL(c)		(ISCONTROLC0(c) || ISCONTROLC1(c))
  44. #define ISDELIM(u)		(u && wcschr(worddelimiters, u))
  46. enum term_mode {
  47. 	MODE_WRAP        = 1 << 0,
  48. 	MODE_INSERT      = 1 << 1,
  49. 	MODE_ALTSCREEN   = 1 << 2,
  50. 	MODE_CRLF        = 1 << 3,
  51. 	MODE_ECHO        = 1 << 4,
  52. 	MODE_PRINT       = 1 << 5,
  53. 	MODE_UTF8        = 1 << 6,
  54. };
  56. enum cursor_movement {
  57. 	CURSOR_SAVE,
  58. 	CURSOR_LOAD
  59. };
  61. enum cursor_state {
  62. 	CURSOR_DEFAULT  = 0,
  63. 	CURSOR_WRAPNEXT = 1,
  64. 	CURSOR_ORIGIN   = 2
  65. };
  67. enum charset {
  68. 	CS_GRAPHIC0,
  69. 	CS_GRAPHIC1,
  70. 	CS_UK,
  71. 	CS_USA,
  72. 	CS_MULTI,
  73. 	CS_GER,
  74. 	CS_FIN
  75. };
  77. enum escape_state {
  78. 	ESC_START      = 1,
  79. 	ESC_CSI        = 2,
  80. 	ESC_STR        = 4,  /* DCS, OSC, PM, APC */
  81. 	ESC_ALTCHARSET = 8,
  82. 	ESC_STR_END    = 16, /* a final string was encountered */
  83. 	ESC_TEST       = 32, /* Enter in test mode */
  84. 	ESC_UTF8       = 64,
  85. };
  87. typedef struct {
  88. 	Glyph attr; /* current char attributes */
  89. 	int x;
  90. 	int y;
  91. 	char state;
  92. } TCursor;
  94. typedef struct {
  95. 	int mode;
  96. 	int type;
  97. 	int snap;
  98. 	/*
  99. 	 * Selection variables:
  100. 	 * nb – normalized coordinates of the beginning of the selection
  101. 	 * ne – normalized coordinates of the end of the selection
  102. 	 * ob – original coordinates of the beginning of the selection
  103. 	 * oe – original coordinates of the end of the selection
  104. 	 */
  105. 	struct {
  106. 		int x, y;
  107. 	} nb, ne, ob, oe;
  109. 	int alt;
  110. } Selection;
  112. /* Internal representation of the screen */
  113. typedef struct {
  114. 	int row;      /* nb row */
  115. 	int col;      /* nb col */
  116. 	Line *line;   /* screen */
  117. 	Line *alt;    /* alternate screen */
  118. 	int *dirty;   /* dirtyness of lines */
  119. 	TCursor c;    /* cursor */
  120. 	int ocx;      /* old cursor col */
  121. 	int ocy;      /* old cursor row */
  122. 	int top;      /* top    scroll limit */
  123. 	int bot;      /* bottom scroll limit */
  124. 	int mode;     /* terminal mode flags */
  125. 	int esc;      /* escape state flags */
  126. 	char trantbl[4]; /* charset table translation */
  127. 	int charset;  /* current charset */
  128. 	int icharset; /* selected charset for sequence */
  129. 	int *tabs;
  130. 	Rune lastc;   /* last printed char outside of sequence, 0 if control */
  131. } Term;
  133. /* CSI Escape sequence structs */
  134. /* ESC '[' [[ [<priv>] <arg> [;]] <mode> [<mode>]] */
  135. typedef struct {
  136. 	char buf[ESC_BUF_SIZ]; /* raw string */
  137. 	size_t len;            /* raw string length */
  138. 	char priv;
  139. 	int arg[ESC_ARG_SIZ];
  140. 	int narg;              /* nb of args */
  141. 	char mode[2];
  142. } CSIEscape;
  144. /* STR Escape sequence structs */
  145. /* ESC type [[ [<priv>] <arg> [;]] <mode>] ESC '\' */
  146. typedef struct {
  147. 	char type;             /* ESC type ... */
  148. 	char *buf;             /* allocated raw string */
  149. 	size_t siz;            /* allocation size */
  150. 	size_t len;            /* raw string length */
  151. 	char *args[STR_ARG_SIZ];
  152. 	int narg;              /* nb of args */
  153. } STREscape;
  155. static void execsh(char *, char **);
  156. static void stty(char **);
  157. static void sigchld(int);
  158. static void ttywriteraw(const char *, size_t);
  160. static void csidump(void);
  161. static void csihandle(void);
  162. static void csiparse(void);
  163. static void csireset(void);
  164. static int eschandle(uchar);
  165. static void strdump(void);
  166. static void strhandle(void);
  167. static void strparse(void);
  168. static void strreset(void);
  170. static void tprinter(char *, size_t);
  171. static void tdumpsel(void);
  172. static void tdumpline(int);
  173. static void tdump(void);
  174. static void tclearregion(int, int, int, int);
  175. static void tcursor(int);
  176. static void tdeletechar(int);
  177. static void tdeleteline(int);
  178. static void tinsertblank(int);
  179. static void tinsertblankline(int);
  180. static int tlinelen(int);
  181. static void tmoveto(int, int);
  182. static void tmoveato(int, int);
  183. static void tnewline(int);
  184. static void tputtab(int);
  185. static void tputc(Rune);
  186. static void treset(void);
  187. static void tscrollup(int, int);
  188. static void tscrolldown(int, int);
  189. static void tsetattr(int *, int);
  190. static void tsetchar(Rune, Glyph *, int, int);
  191. static void tsetdirt(int, int);
  192. static void tsetscroll(int, int);
  193. static void tswapscreen(void);
  194. static void tsetmode(int, int, int *, int);
  195. static int twrite(const char *, int, int);
  196. static void tfulldirt(void);
  197. static void tcontrolcode(uchar );
  198. static void tdectest(char );
  199. static void tdefutf8(char);
  200. static int32_t tdefcolor(int *, int *, int);
  201. static void tdeftran(char);
  202. static void tstrsequence(uchar);
  204. static void drawregion(int, int, int, int);
  206. static void selnormalize(void);
  207. static void selscroll(int, int);
  208. static void selsnap(int *, int *, int);
  210. static size_t utf8decode(const char *, Rune *, size_t);
  211. static Rune utf8decodebyte(char, size_t *);
  212. static char utf8encodebyte(Rune, size_t);
  213. static size_t utf8validate(Rune *, size_t);
  215. static char *base64dec(const char *);
  216. static char base64dec_getc(const char **);
  218. static ssize_t xwrite(int, const char *, size_t);
  220. /* Globals */
  221. static Term term;
  222. static Selection sel;
  223. static CSIEscape csiescseq;
  224. static STREscape strescseq;
  225. static int iofd = 1;
  226. static int cmdfd;
  227. static pid_t pid;
  229. static uchar utfbyte[UTF_SIZ + 1] = {0x80,    0, 0xC0, 0xE0, 0xF0};
  230. static uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
  231. static Rune utfmin[UTF_SIZ + 1] = {       0,    0,  0x80,  0x800,  0x10000};
  232. static Rune utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};
  234. ssize_t
  235. xwrite(int fd, const char *s, size_t len)
  236. {
  237. 	size_t aux = len;
  238. 	ssize_t r;
  240. 	while (len > 0) {
  241. 		r = write(fd, s, len);
  242. 		if (r < 0)
  243. 			return r;
  244. 		len -= r;
  245. 		s += r;
  246. 	}
  248. 	return aux;
  249. }
  251. void *
  252. xmalloc(size_t len)
  253. {
  254. 	void *p;
  256. 	if (!(p = malloc(len)))
  257. 		die("malloc: %s\n", strerror(errno));
  259. 	return p;
  260. }
  262. void *
  263. xrealloc(void *p, size_t len)
  264. {
  265. 	if ((p = realloc(p, len)) == NULL)
  266. 		die("realloc: %s\n", strerror(errno));
  268. 	return p;
  269. }
  271. char *
  272. xstrdup(char *s)
  273. {
  274. 	if ((s = strdup(s)) == NULL)
  275. 		die("strdup: %s\n", strerror(errno));
  277. 	return s;
  278. }
  280. size_t
  281. utf8decode(const char *c, Rune *u, size_t clen)
  282. {
  283. 	size_t i, j, len, type;
  284. 	Rune udecoded;
  286. 	*u = UTF_INVALID;
  287. 	if (!clen)
  288. 		return 0;
  289. 	udecoded = utf8decodebyte(c[0], &len);
  290. 	if (!BETWEEN(len, 1, UTF_SIZ))
  291. 		return 1;
  292. 	for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
  293. 		udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type);
  294. 		if (type != 0)
  295. 			return j;
  296. 	}
  297. 	if (j < len)
  298. 		return 0;
  299. 	*u = udecoded;
  300. 	utf8validate(u, len);
  302. 	return len;
  303. }
  305. Rune
  306. utf8decodebyte(char c, size_t *i)
  307. {
  308. 	for (*i = 0; *i < LEN(utfmask); ++(*i))
  309. 		if (((uchar)c & utfmask[*i]) == utfbyte[*i])
  310. 			return (uchar)c & ~utfmask[*i];
  312. 	return 0;
  313. }
  315. size_t
  316. utf8encode(Rune u, char *c)
  317. {
  318. 	size_t len, i;
  320. 	len = utf8validate(&u, 0);
  321. 	if (len > UTF_SIZ)
  322. 		return 0;
  324. 	for (i = len - 1; i != 0; --i) {
  325. 		c[i] = utf8encodebyte(u, 0);
  326. 		u >>= 6;
  327. 	}
  328. 	c[0] = utf8encodebyte(u, len);
  330. 	return len;
  331. }
  333. char
  334. utf8encodebyte(Rune u, size_t i)
  335. {
  336. 	return utfbyte[i] | (u & ~utfmask[i]);
  337. }
  339. size_t
  340. utf8validate(Rune *u, size_t i)
  341. {
  342. 	if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF))
  343. 		*u = UTF_INVALID;
  344. 	for (i = 1; *u > utfmax[i]; ++i)
  345. 		;
  347. 	return i;
  348. }
  350. static const char base64_digits[] = {
  351. 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  352. 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 62, 0, 0, 0,
  353. 	63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 0, 0, 0, -1, 0, 0, 0, 0, 1,
  354. 	2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21,
  355. 	22, 23, 24, 25, 0, 0, 0, 0, 0, 0, 26, 27, 28, 29, 30, 31, 32, 33, 34,
  356. 	35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 0,
  357. 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  358. 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  359. 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  360. 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  361. 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  362. 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
  363. };
  365. char
  366. base64dec_getc(const char **src)
  367. {
  368. 	while (**src && !isprint(**src))
  369. 		(*src)++;
  370. 	return **src ? *((*src)++) : '=';  /* emulate padding if string ends */
  371. }
  373. char *
  374. base64dec(const char *src)
  375. {
  376. 	size_t in_len = strlen(src);
  377. 	char *result, *dst;
  379. 	if (in_len % 4)
  380. 		in_len += 4 - (in_len % 4);
  381. 	result = dst = xmalloc(in_len / 4 * 3 + 1);
  382. 	while (*src) {
  383. 		int a = base64_digits[(unsigned char) base64dec_getc(&src)];
  384. 		int b = base64_digits[(unsigned char) base64dec_getc(&src)];
  385. 		int c = base64_digits[(unsigned char) base64dec_getc(&src)];
  386. 		int d = base64_digits[(unsigned char) base64dec_getc(&src)];
  388. 		/* invalid input. 'a' can be -1, e.g. if src is "\n" (c-str) */
  389. 		if (a == -1 || b == -1)
  390. 			break;
  392. 		*dst++ = (a << 2) | ((b & 0x30) >> 4);
  393. 		if (c == -1)
  394. 			break;
  395. 		*dst++ = ((b & 0x0f) << 4) | ((c & 0x3c) >> 2);
  396. 		if (d == -1)
  397. 			break;
  398. 		*dst++ = ((c & 0x03) << 6) | d;
  399. 	}
  400. 	*dst = '\0';
  401. 	return result;
  402. }
  404. void
  405. selinit(void)
  406. {
  407. 	sel.mode = SEL_IDLE;
  408. 	sel.snap = 0;
  409. 	sel.ob.x = -1;
  410. }
  412. int
  413. tlinelen(int y)
  414. {
  415. 	int i = term.col;
  417. 	if (term.line[y][i - 1].mode & ATTR_WRAP)
  418. 		return i;
  420. 	while (i > 0 && term.line[y][i - 1].u == ' ')
  421. 		--i;
  423. 	return i;
  424. }
  426. void
  427. selstart(int col, int row, int snap)
  428. {
  429. 	selclear();
  430. 	sel.mode = SEL_EMPTY;
  431. 	sel.type = SEL_REGULAR;
  432. 	sel.alt = IS_SET(MODE_ALTSCREEN);
  433. 	sel.snap = snap;
  434. 	sel.oe.x = sel.ob.x = col;
  435. 	sel.oe.y = sel.ob.y = row;
  436. 	selnormalize();
  438. 	if (sel.snap != 0)
  439. 		sel.mode = SEL_READY;
  440. 	tsetdirt(sel.nb.y, sel.ne.y);
  441. }
  443. void
  444. selextend(int col, int row, int type, int done)
  445. {
  446. 	int oldey, oldex, oldsby, oldsey, oldtype;
  448. 	if (sel.mode == SEL_IDLE)
  449. 		return;
  450. 	if (done && sel.mode == SEL_EMPTY) {
  451. 		selclear();
  452. 		return;
  453. 	}
  455. 	oldey = sel.oe.y;
  456. 	oldex = sel.oe.x;
  457. 	oldsby = sel.nb.y;
  458. 	oldsey = sel.ne.y;
  459. 	oldtype = sel.type;
  461. 	sel.oe.x = col;
  462. 	sel.oe.y = row;
  463. 	selnormalize();
  464. 	sel.type = type;
  466. 	if (oldey != sel.oe.y || oldex != sel.oe.x || oldtype != sel.type || sel.mode == SEL_EMPTY)
  467. 		tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey));
  469. 	sel.mode = done ? SEL_IDLE : SEL_READY;
  470. }
  472. void
  473. selnormalize(void)
  474. {
  475. 	int i;
  477. 	if (sel.type == SEL_REGULAR && sel.ob.y != sel.oe.y) {
  478. 		sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x;
  479. 		sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x;
  480. 	} else {
  481. 		sel.nb.x = MIN(sel.ob.x, sel.oe.x);
  482. 		sel.ne.x = MAX(sel.ob.x, sel.oe.x);
  483. 	}
  484. 	sel.nb.y = MIN(sel.ob.y, sel.oe.y);
  485. 	sel.ne.y = MAX(sel.ob.y, sel.oe.y);
  487. 	selsnap(&sel.nb.x, &sel.nb.y, -1);
  488. 	selsnap(&sel.ne.x, &sel.ne.y, +1);
  490. 	/* expand selection over line breaks */
  491. 	if (sel.type == SEL_RECTANGULAR)
  492. 		return;
  493. 	i = tlinelen(sel.nb.y);
  494. 	if (i < sel.nb.x)
  495. 		sel.nb.x = i;
  496. 	if (tlinelen(sel.ne.y) <= sel.ne.x)
  497. 		sel.ne.x = term.col - 1;
  498. }
  500. int
  501. selected(int x, int y)
  502. {
  503. 	if (sel.mode == SEL_EMPTY || sel.ob.x == -1 ||
  504. 			sel.alt != IS_SET(MODE_ALTSCREEN))
  505. 		return 0;
  507. 	if (sel.type == SEL_RECTANGULAR)
  508. 		return BETWEEN(y, sel.nb.y, sel.ne.y)
  509. 		    && BETWEEN(x, sel.nb.x, sel.ne.x);
  511. 	return BETWEEN(y, sel.nb.y, sel.ne.y)
  512. 	    && (y != sel.nb.y || x >= sel.nb.x)
  513. 	    && (y != sel.ne.y || x <= sel.ne.x);
  514. }
  516. void
  517. selsnap(int *x, int *y, int direction)
  518. {
  519. 	int newx, newy, xt, yt;
  520. 	int delim, prevdelim;
  521. 	Glyph *gp, *prevgp;
  523. 	switch (sel.snap) {
  524. 	case SNAP_WORD:
  525. 		/*
  526. 		 * Snap around if the word wraps around at the end or
  527. 		 * beginning of a line.
  528. 		 */
  529. 		prevgp = &term.line[*y][*x];
  530. 		prevdelim = ISDELIM(prevgp->u);
  531. 		for (;;) {
  532. 			newx = *x + direction;
  533. 			newy = *y;
  534. 			if (!BETWEEN(newx, 0, term.col - 1)) {
  535. 				newy += direction;
  536. 				newx = (newx + term.col) % term.col;
  537. 				if (!BETWEEN(newy, 0, term.row - 1))
  538. 					break;
  540. 				if (direction > 0)
  541. 					yt = *y, xt = *x;
  542. 				else
  543. 					yt = newy, xt = newx;
  544. 				if (!(term.line[yt][xt].mode & ATTR_WRAP))
  545. 					break;
  546. 			}
  548. 			if (newx >= tlinelen(newy))
  549. 				break;
  551. 			gp = &term.line[newy][newx];
  552. 			delim = ISDELIM(gp->u);
  553. 			if (!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim
  554. 					|| (delim && gp->u != prevgp->u)))
  555. 				break;
  557. 			*x = newx;
  558. 			*y = newy;
  559. 			prevgp = gp;
  560. 			prevdelim = delim;
  561. 		}
  562. 		break;
  563. 	case SNAP_LINE:
  564. 		/*
  565. 		 * Snap around if the the previous line or the current one
  566. 		 * has set ATTR_WRAP at its end. Then the whole next or
  567. 		 * previous line will be selected.
  568. 		 */
  569. 		*x = (direction < 0) ? 0 : term.col - 1;
  570. 		if (direction < 0) {
  571. 			for (; *y > 0; *y += direction) {
  572. 				if (!(term.line[*y-1][term.col-1].mode
  573. 						& ATTR_WRAP)) {
  574. 					break;
  575. 				}
  576. 			}
  577. 		} else if (direction > 0) {
  578. 			for (; *y < term.row-1; *y += direction) {
  579. 				if (!(term.line[*y][term.col-1].mode
  580. 						& ATTR_WRAP)) {
  581. 					break;
  582. 				}
  583. 			}
  584. 		}
  585. 		break;
  586. 	}
  587. }
  589. char *
  590. getsel(void)
  591. {
  592. 	char *str, *ptr;
  593. 	int y, bufsize, lastx, linelen;
  594. 	Glyph *gp, *last;
  596. 	if (sel.ob.x == -1)
  597. 		return NULL;
  599. 	bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ;
  600. 	ptr = str = xmalloc(bufsize);
  602. 	/* append every set & selected glyph to the selection */
  603. 	for (y = sel.nb.y; y <= sel.ne.y; y++) {
  604. 		if ((linelen = tlinelen(y)) == 0) {
  605. 			*ptr++ = '\n';
  606. 			continue;
  607. 		}
  609. 		if (sel.type == SEL_RECTANGULAR) {
  610. 			gp = &term.line[y][sel.nb.x];
  611. 			lastx = sel.ne.x;
  612. 		} else {
  613. 			gp = &term.line[y][sel.nb.y == y ? sel.nb.x : 0];
  614. 			lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1;
  615. 		}
  616. 		last = &term.line[y][MIN(lastx, linelen-1)];
  617. 		while (last >= gp && last->u == ' ')
  618. 			--last;
  620. 		for ( ; gp <= last; ++gp) {
  621. 			if (gp->mode & ATTR_WDUMMY)
  622. 				continue;
  624. 			ptr += utf8encode(gp->u, ptr);
  625. 		}
  627. 		/*
  628. 		 * Copy and pasting of line endings is inconsistent
  629. 		 * in the inconsistent terminal and GUI world.
  630. 		 * The best solution seems like to produce '\n' when
  631. 		 * something is copied from st and convert '\n' to
  632. 		 * '\r', when something to be pasted is received by
  633. 		 * st.
  634. 		 * FIXME: Fix the computer world.
  635. 		 */
  636. 		if ((y < sel.ne.y || lastx >= linelen) &&
  637. 		    (!(last->mode & ATTR_WRAP) || sel.type == SEL_RECTANGULAR))
  638. 			*ptr++ = '\n';
  639. 	}
  640. 	*ptr = 0;
  641. 	return str;
  642. }
  644. void
  645. selclear(void)
  646. {
  647. 	if (sel.ob.x == -1)
  648. 		return;
  649. 	sel.mode = SEL_IDLE;
  650. 	sel.ob.x = -1;
  651. 	tsetdirt(sel.nb.y, sel.ne.y);
  652. }
  654. void
  655. die(const char *errstr, ...)
  656. {
  657. 	va_list ap;
  659. 	va_start(ap, errstr);
  660. 	vfprintf(stderr, errstr, ap);
  661. 	va_end(ap);
  662. 	exit(1);
  663. }
  665. void
  666. execsh(char *cmd, char **args)
  667. {
  668. 	char *sh, *prog, *arg;
  669. 	const struct passwd *pw;
  671. 	errno = 0;
  672. 	if ((pw = getpwuid(getuid())) == NULL) {
  673. 		if (errno)
  674. 			die("getpwuid: %s\n", strerror(errno));
  675. 		else
  676. 			die("who are you?\n");
  677. 	}
  679. 	if ((sh = getenv("SHELL")) == NULL)
  680. 		sh = (pw->pw_shell[0]) ? pw->pw_shell : cmd;
  682. 	if (args) {
  683. 		prog = args[0];
  684. 		arg = NULL;
  685. 	} else if (scroll) {
  686. 		prog = scroll;
  687. 		arg = utmp ? utmp : sh;
  688. 	} else if (utmp) {
  689. 		prog = utmp;
  690. 		arg = NULL;
  691. 	} else {
  692. 		prog = sh;
  693. 		arg = NULL;
  694. 	}
  695. 	DEFAULT(args, ((char *[]) {prog, arg, NULL}));
  697. 	unsetenv("COLUMNS");
  698. 	unsetenv("LINES");
  699. 	unsetenv("TERMCAP");
  700. 	setenv("LOGNAME", pw->pw_name, 1);
  701. 	setenv("USER", pw->pw_name, 1);
  702. 	setenv("SHELL", sh, 1);
  703. 	setenv("HOME", pw->pw_dir, 1);
  704. 	setenv("TERM", termname, 1);
  706. 	signal(SIGCHLD, SIG_DFL);
  707. 	signal(SIGHUP, SIG_DFL);
  708. 	signal(SIGINT, SIG_DFL);
  709. 	signal(SIGQUIT, SIG_DFL);
  710. 	signal(SIGTERM, SIG_DFL);
  711. 	signal(SIGALRM, SIG_DFL);
  713. 	execvp(prog, args);
  714. 	_exit(1);
  715. }
  717. void
  718. sigchld(int a)
  719. {
  720. 	int stat;
  721. 	pid_t p;
  723. 	if ((p = waitpid(pid, &stat, WNOHANG)) < 0)
  724. 		die("waiting for pid %hd failed: %s\n", pid, strerror(errno));
  726. 	if (pid != p)
  727. 		return;
  729. 	if (WIFEXITED(stat) && WEXITSTATUS(stat))
  730. 		die("child exited with status %d\n", WEXITSTATUS(stat));
  731. 	else if (WIFSIGNALED(stat))
  732. 		die("child terminated due to signal %d\n", WTERMSIG(stat));
  733. 	_exit(0);
  734. }
  736. void
  737. stty(char **args)
  738. {
  739. 	char cmd[_POSIX_ARG_MAX], **p, *q, *s;
  740. 	size_t n, siz;
  742. 	if ((n = strlen(stty_args)) > sizeof(cmd)-1)
  743. 		die("incorrect stty parameters\n");
  744. 	memcpy(cmd, stty_args, n);
  745. 	q = cmd + n;
  746. 	siz = sizeof(cmd) - n;
  747. 	for (p = args; p && (s = *p); ++p) {
  748. 		if ((n = strlen(s)) > siz-1)
  749. 			die("stty parameter length too long\n");
  750. 		*q++ = ' ';
  751. 		memcpy(q, s, n);
  752. 		q += n;
  753. 		siz -= n + 1;
  754. 	}
  755. 	*q = '\0';
  756. 	if (system(cmd) != 0)
  757. 		perror("Couldn't call stty");
  758. }
  760. int
  761. ttynew(char *line, char *cmd, char *out, char **args)
  762. {
  763. 	int m, s;
  765. 	if (out) {
  766. 		term.mode |= MODE_PRINT;
  767. 		iofd = (!strcmp(out, "-")) ?
  768. 			  1 : open(out, O_WRONLY | O_CREAT, 0666);
  769. 		if (iofd < 0) {
  770. 			fprintf(stderr, "Error opening %s:%s\n",
  771. 				out, strerror(errno));
  772. 		}
  773. 	}
  775. 	if (line) {
  776. 		if ((cmdfd = open(line, O_RDWR)) < 0)
  777. 			die("open line '%s' failed: %s\n",
  778. 			    line, strerror(errno));
  779. 		dup2(cmdfd, 0);
  780. 		stty(args);
  781. 		return cmdfd;
  782. 	}
  784. 	/* seems to work fine on linux, openbsd and freebsd */
  785. 	if (openpty(&m, &s, NULL, NULL, NULL) < 0)
  786. 		die("openpty failed: %s\n", strerror(errno));
  788. 	switch (pid = fork()) {
  789. 	case -1:
  790. 		die("fork failed: %s\n", strerror(errno));
  791. 		break;
  792. 	case 0:
  793. 		close(iofd);
  794. 		setsid(); /* create a new process group */
  795. 		dup2(s, 0);
  796. 		dup2(s, 1);
  797. 		dup2(s, 2);
  798. 		if (ioctl(s, TIOCSCTTY, NULL) < 0)
  799. 			die("ioctl TIOCSCTTY failed: %s\n", strerror(errno));
  800. 		close(s);
  801. 		close(m);
  802. #ifdef __OpenBSD__
  803. 		if (pledge("stdio getpw proc exec", NULL) == -1)
  804. 			die("pledge\n");
  805. #endif
  806. 		execsh(cmd, args);
  807. 		break;
  808. 	default:
  809. #ifdef __OpenBSD__
  810. 		if (pledge("stdio rpath tty proc", NULL) == -1)
  811. 			die("pledge\n");
  812. #endif
  813. 		close(s);
  814. 		cmdfd = m;
  815. 		signal(SIGCHLD, sigchld);
  816. 		break;
  817. 	}
  818. 	return cmdfd;
  819. }
  821. size_t
  822. ttyread(void)
  823. {
  824. 	static char buf[BUFSIZ];
  825. 	static int buflen = 0;
  826. 	int ret, written;
  828. 	/* append read bytes to unprocessed bytes */
  829. 	ret = read(cmdfd, buf+buflen, LEN(buf)-buflen);
  831. 	switch (ret) {
  832. 	case 0:
  833. 		exit(0);
  834. 	case -1:
  835. 		die("couldn't read from shell: %s\n", strerror(errno));
  836. 	default:
  837. 		buflen += ret;
  838. 		written = twrite(buf, buflen, 0);
  839. 		buflen -= written;
  840. 		/* keep any incomplete UTF-8 byte sequence for the next call */
  841. 		if (buflen > 0)
  842. 			memmove(buf, buf + written, buflen);
  843. 		return ret;
  844. 	}
  845. }
  847. void
  848. ttywrite(const char *s, size_t n, int may_echo)
  849. {
  850. 	const char *next;
  852. 	if (may_echo && IS_SET(MODE_ECHO))
  853. 		twrite(s, n, 1);
  855. 	if (!IS_SET(MODE_CRLF)) {
  856. 		ttywriteraw(s, n);
  857. 		return;
  858. 	}
  860. 	/* This is similar to how the kernel handles ONLCR for ttys */
  861. 	while (n > 0) {
  862. 		if (*s == '\r') {
  863. 			next = s + 1;
  864. 			ttywriteraw("\r\n", 2);
  865. 		} else {
  866. 			next = memchr(s, '\r', n);
  867. 			DEFAULT(next, s + n);
  868. 			ttywriteraw(s, next - s);
  869. 		}
  870. 		n -= next - s;
  871. 		s = next;
  872. 	}
  873. }
  875. void
  876. ttywriteraw(const char *s, size_t n)
  877. {
  878. 	fd_set wfd, rfd;
  879. 	ssize_t r;
  880. 	size_t lim = 256;
  882. 	/*
  883. 	 * Remember that we are using a pty, which might be a modem line.
  884. 	 * Writing too much will clog the line. That's why we are doing this
  885. 	 * dance.
  886. 	 * FIXME: Migrate the world to Plan 9.
  887. 	 */
  888. 	while (n > 0) {
  889. 		FD_ZERO(&wfd);
  890. 		FD_ZERO(&rfd);
  891. 		FD_SET(cmdfd, &wfd);
  892. 		FD_SET(cmdfd, &rfd);
  894. 		/* Check if we can write. */
  895. 		if (pselect(cmdfd+1, &rfd, &wfd, NULL, NULL, NULL) < 0) {
  896. 			if (errno == EINTR)
  897. 				continue;
  898. 			die("select failed: %s\n", strerror(errno));
  899. 		}
  900. 		if (FD_ISSET(cmdfd, &wfd)) {
  901. 			/*
  902. 			 * Only write the bytes written by ttywrite() or the
  903. 			 * default of 256. This seems to be a reasonable value
  904. 			 * for a serial line. Bigger values might clog the I/O.
  905. 			 */
  906. 			if ((r = write(cmdfd, s, (n < lim)? n : lim)) < 0)
  907. 				goto write_error;
  908. 			if (r < n) {
  909. 				/*
  910. 				 * We weren't able to write out everything.
  911. 				 * This means the buffer is getting full
  912. 				 * again. Empty it.
  913. 				 */
  914. 				if (n < lim)
  915. 					lim = ttyread();
  916. 				n -= r;
  917. 				s += r;
  918. 			} else {
  919. 				/* All bytes have been written. */
  920. 				break;
  921. 			}
  922. 		}
  923. 		if (FD_ISSET(cmdfd, &rfd))
  924. 			lim = ttyread();
  925. 	}
  926. 	return;
  928. write_error:
  929. 	die("write error on tty: %s\n", strerror(errno));
  930. }
  932. void
  933. ttyresize(int tw, int th)
  934. {
  935. 	struct winsize w;
  937. 	w.ws_row = term.row;
  938. 	w.ws_col = term.col;
  939. 	w.ws_xpixel = tw;
  940. 	w.ws_ypixel = th;
  941. 	if (ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
  942. 		fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno));
  943. }
  945. void
  946. ttyhangup()
  947. {
  948. 	/* Send SIGHUP to shell */
  949. 	kill(pid, SIGHUP);
  950. }
  952. int
  953. tattrset(int attr)
  954. {
  955. 	int i, j;
  957. 	for (i = 0; i < term.row-1; i++) {
  958. 		for (j = 0; j < term.col-1; j++) {
  959. 			if (term.line[i][j].mode & attr)
  960. 				return 1;
  961. 		}
  962. 	}
  964. 	return 0;
  965. }
  967. void
  968. tsetdirt(int top, int bot)
  969. {
  970. 	int i;
  972. 	LIMIT(top, 0, term.row-1);
  973. 	LIMIT(bot, 0, term.row-1);
  975. 	for (i = top; i <= bot; i++)
  976. 		term.dirty[i] = 1;
  977. }
  979. void
  980. tsetdirtattr(int attr)
  981. {
  982. 	int i, j;
  984. 	for (i = 0; i < term.row-1; i++) {
  985. 		for (j = 0; j < term.col-1; j++) {
  986. 			if (term.line[i][j].mode & attr) {
  987. 				tsetdirt(i, i);
  988. 				break;
  989. 			}
  990. 		}
  991. 	}
  992. }
  994. void
  995. tfulldirt(void)
  996. {
  997. 	tsetdirt(0, term.row-1);
  998. }
  1000. void
  1001. tcursor(int mode)
  1002. {
  1003. 	static TCursor c[2];
  1004. 	int alt = IS_SET(MODE_ALTSCREEN);
  1006. 	if (mode == CURSOR_SAVE) {
  1007. 		c[alt] = term.c;
  1008. 	} else if (mode == CURSOR_LOAD) {
  1009. 		term.c = c[alt];
  1010. 		tmoveto(c[alt].x, c[alt].y);
  1011. 	}
  1012. }
  1014. void
  1015. treset(void)
  1016. {
  1017. 	uint i;
  1019. 	term.c = (TCursor){{
  1020. 		.mode = ATTR_NULL,
  1021. 		.fg = defaultfg,
  1022. 		.bg = defaultbg
  1023. 	}, .x = 0, .y = 0, .state = CURSOR_DEFAULT};
  1025. 	memset(term.tabs, 0, term.col * sizeof(*term.tabs));
  1026. 	for (i = tabspaces; i < term.col; i += tabspaces)
  1027. 		term.tabs[i] = 1;
  1028. 	term.top = 0;
  1029. 	term.bot = term.row - 1;
  1030. 	term.mode = MODE_WRAP|MODE_UTF8;
  1031. 	memset(term.trantbl, CS_USA, sizeof(term.trantbl));
  1032. 	term.charset = 0;
  1034. 	for (i = 0; i < 2; i++) {
  1035. 		tmoveto(0, 0);
  1036. 		tcursor(CURSOR_SAVE);
  1037. 		tclearregion(0, 0, term.col-1, term.row-1);
  1038. 		tswapscreen();
  1039. 	}
  1040. }
  1042. void
  1043. tnew(int col, int row)
  1044. {
  1045. 	term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } };
  1046. 	tresize(col, row);
  1047. 	treset();
  1048. }
  1050. void
  1051. tswapscreen(void)
  1052. {
  1053. 	Line *tmp = term.line;
  1055. 	term.line = term.alt;
  1056. 	term.alt = tmp;
  1057. 	term.mode ^= MODE_ALTSCREEN;
  1058. 	tfulldirt();
  1059. }
  1061. void
  1062. tscrolldown(int orig, int n)
  1063. {
  1064. 	int i;
  1065. 	Line temp;
  1067. 	LIMIT(n, 0, term.bot-orig+1);
  1069. 	tsetdirt(orig, term.bot-n);
  1070. 	tclearregion(0, term.bot-n+1, term.col-1, term.bot);
  1072. 	for (i = term.bot; i >= orig+n; i--) {
  1073. 		temp = term.line[i];
  1074. 		term.line[i] = term.line[i-n];
  1075. 		term.line[i-n] = temp;
  1076. 	}
  1078. 	selscroll(orig, n);
  1079. }
  1081. void
  1082. tscrollup(int orig, int n)
  1083. {
  1084. 	int i;
  1085. 	Line temp;
  1087. 	LIMIT(n, 0, term.bot-orig+1);
  1089. 	tclearregion(0, orig, term.col-1, orig+n-1);
  1090. 	tsetdirt(orig+n, term.bot);
  1092. 	for (i = orig; i <= term.bot-n; i++) {
  1093. 		temp = term.line[i];
  1094. 		term.line[i] = term.line[i+n];
  1095. 		term.line[i+n] = temp;
  1096. 	}
  1098. 	selscroll(orig, -n);
  1099. }
  1101. void
  1102. selscroll(int orig, int n)
  1103. {
  1104. 	if (sel.ob.x == -1)
  1105. 		return;
  1107. 	if (BETWEEN(sel.nb.y, orig, term.bot) != BETWEEN(sel.ne.y, orig, term.bot)) {
  1108. 		selclear();
  1109. 	} else if (BETWEEN(sel.nb.y, orig, term.bot)) {
  1110. 		sel.ob.y += n;
  1111. 		sel.oe.y += n;
  1112. 		if (sel.ob.y < term.top || sel.ob.y > term.bot ||
  1113. 		    sel.oe.y < term.top || sel.oe.y > term.bot) {
  1114. 			selclear();
  1115. 		} else {
  1116. 			selnormalize();
  1117. 		}
  1118. 	}
  1119. }
  1121. void
  1122. tnewline(int first_col)
  1123. {
  1124. 	int y = term.c.y;
  1126. 	if (y == term.bot) {
  1127. 		tscrollup(term.top, 1);
  1128. 	} else {
  1129. 		y++;
  1130. 	}
  1131. 	tmoveto(first_col ? 0 : term.c.x, y);
  1132. }
  1134. void
  1135. csiparse(void)
  1136. {
  1137. 	char *p = csiescseq.buf, *np;
  1138. 	long int v;
  1140. 	csiescseq.narg = 0;
  1141. 	if (*p == '?') {
  1142. 		csiescseq.priv = 1;
  1143. 		p++;
  1144. 	}
  1146. 	csiescseq.buf[csiescseq.len] = '\0';
  1147. 	while (p < csiescseq.buf+csiescseq.len) {
  1148. 		np = NULL;
  1149. 		v = strtol(p, &np, 10);
  1150. 		if (np == p)
  1151. 			v = 0;
  1152. 		if (v == LONG_MAX || v == LONG_MIN)
  1153. 			v = -1;
  1154. 		csiescseq.arg[csiescseq.narg++] = v;
  1155. 		p = np;
  1156. 		if (*p != ';' || csiescseq.narg == ESC_ARG_SIZ)
  1157. 			break;
  1158. 		p++;
  1159. 	}
  1160. 	csiescseq.mode[0] = *p++;
  1161. 	csiescseq.mode[1] = (p < csiescseq.buf+csiescseq.len) ? *p : '\0';
  1162. }
  1164. /* for absolute user moves, when decom is set */
  1165. void
  1166. tmoveato(int x, int y)
  1167. {
  1168. 	tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0));
  1169. }
  1171. void
  1172. tmoveto(int x, int y)
  1173. {
  1174. 	int miny, maxy;
  1176. 	if (term.c.state & CURSOR_ORIGIN) {
  1177. 		miny = term.top;
  1178. 		maxy = term.bot;
  1179. 	} else {
  1180. 		miny = 0;
  1181. 		maxy = term.row - 1;
  1182. 	}
  1183. 	term.c.state &= ~CURSOR_WRAPNEXT;
  1184. 	term.c.x = LIMIT(x, 0, term.col-1);
  1185. 	term.c.y = LIMIT(y, miny, maxy);
  1186. }
  1188. void
  1189. tsetchar(Rune u, Glyph *attr, int x, int y)
  1190. {
  1191. 	static char *vt100_0[62] = { /* 0x41 - 0x7e */
  1192. 		"↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */
  1193. 		0, 0, 0, 0, 0, 0, 0, 0, /* H - O */
  1194. 		0, 0, 0, 0, 0, 0, 0, 0, /* P - W */
  1195. 		0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */
  1196. 		"◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */
  1197. 		"␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */
  1198. 		"⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */
  1199. 		"│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */
  1200. 	};
  1202. 	/*
  1203. 	 * The table is proudly stolen from rxvt.
  1204. 	 */
  1205. 	if (term.trantbl[term.charset] == CS_GRAPHIC0 &&
  1206. 	   BETWEEN(u, 0x41, 0x7e) && vt100_0[u - 0x41])
  1207. 		utf8decode(vt100_0[u - 0x41], &u, UTF_SIZ);
  1209. 	if (term.line[y][x].mode & ATTR_WIDE) {
  1210. 		if (x+1 < term.col) {
  1211. 			term.line[y][x+1].u = ' ';
  1212. 			term.line[y][x+1].mode &= ~ATTR_WDUMMY;
  1213. 		}
  1214. 	} else if (term.line[y][x].mode & ATTR_WDUMMY) {
  1215. 		term.line[y][x-1].u = ' ';
  1216. 		term.line[y][x-1].mode &= ~ATTR_WIDE;
  1217. 	}
  1219. 	term.dirty[y] = 1;
  1220. 	term.line[y][x] = *attr;
  1221. 	term.line[y][x].u = u;
  1222. }
  1224. void
  1225. tclearregion(int x1, int y1, int x2, int y2)
  1226. {
  1227. 	int x, y, temp;
  1228. 	Glyph *gp;
  1230. 	if (x1 > x2)
  1231. 		temp = x1, x1 = x2, x2 = temp;
  1232. 	if (y1 > y2)
  1233. 		temp = y1, y1 = y2, y2 = temp;
  1235. 	LIMIT(x1, 0, term.col-1);
  1236. 	LIMIT(x2, 0, term.col-1);
  1237. 	LIMIT(y1, 0, term.row-1);
  1238. 	LIMIT(y2, 0, term.row-1);
  1240. 	for (y = y1; y <= y2; y++) {
  1241. 		term.dirty[y] = 1;
  1242. 		for (x = x1; x <= x2; x++) {
  1243. 			gp = &term.line[y][x];
  1244. 			if (selected(x, y))
  1245. 				selclear();
  1246. 			gp->fg = term.c.attr.fg;
  1247. 			gp->bg = term.c.attr.bg;
  1248. 			gp->mode = 0;
  1249. 			gp->u = ' ';
  1250. 		}
  1251. 	}
  1252. }
  1254. void
  1255. tdeletechar(int n)
  1256. {
  1257. 	int dst, src, size;
  1258. 	Glyph *line;
  1260. 	LIMIT(n, 0, term.col - term.c.x);
  1262. 	dst = term.c.x;
  1263. 	src = term.c.x + n;
  1264. 	size = term.col - src;
  1265. 	line = term.line[term.c.y];
  1267. 	memmove(&line[dst], &line[src], size * sizeof(Glyph));
  1268. 	tclearregion(term.col-n, term.c.y, term.col-1, term.c.y);
  1269. }
  1271. void
  1272. tinsertblank(int n)
  1273. {
  1274. 	int dst, src, size;
  1275. 	Glyph *line;
  1277. 	LIMIT(n, 0, term.col - term.c.x);
  1279. 	dst = term.c.x + n;
  1280. 	src = term.c.x;
  1281. 	size = term.col - dst;
  1282. 	line = term.line[term.c.y];
  1284. 	memmove(&line[dst], &line[src], size * sizeof(Glyph));
  1285. 	tclearregion(src, term.c.y, dst - 1, term.c.y);
  1286. }
  1288. void
  1289. tinsertblankline(int n)
  1290. {
  1291. 	if (BETWEEN(term.c.y, term.top, term.bot))
  1292. 		tscrolldown(term.c.y, n);
  1293. }
  1295. void
  1296. tdeleteline(int n)
  1297. {
  1298. 	if (BETWEEN(term.c.y, term.top, term.bot))
  1299. 		tscrollup(term.c.y, n);
  1300. }
  1302. int32_t
  1303. tdefcolor(int *attr, int *npar, int l)
  1304. {
  1305. 	int32_t idx = -1;
  1306. 	uint r, g, b;
  1308. 	switch (attr[*npar + 1]) {
  1309. 	case 2: /* direct color in RGB space */
  1310. 		if (*npar + 4 >= l) {
  1311. 			fprintf(stderr,
  1312. 				"erresc(38): Incorrect number of parameters (%d)\n",
  1313. 				*npar);
  1314. 			break;
  1315. 		}
  1316. 		r = attr[*npar + 2];
  1317. 		g = attr[*npar + 3];
  1318. 		b = attr[*npar + 4];
  1319. 		*npar += 4;
  1320. 		if (!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255))
  1321. 			fprintf(stderr, "erresc: bad rgb color (%u,%u,%u)\n",
  1322. 				r, g, b);
  1323. 		else
  1324. 			idx = TRUECOLOR(r, g, b);
  1325. 		break;
  1326. 	case 5: /* indexed color */
  1327. 		if (*npar + 2 >= l) {
  1328. 			fprintf(stderr,
  1329. 				"erresc(38): Incorrect number of parameters (%d)\n",
  1330. 				*npar);
  1331. 			break;
  1332. 		}
  1333. 		*npar += 2;
  1334. 		if (!BETWEEN(attr[*npar], 0, 255))
  1335. 			fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]);
  1336. 		else
  1337. 			idx = attr[*npar];
  1338. 		break;
  1339. 	case 0: /* implemented defined (only foreground) */
  1340. 	case 1: /* transparent */
  1341. 	case 3: /* direct color in CMY space */
  1342. 	case 4: /* direct color in CMYK space */
  1343. 	default:
  1344. 		fprintf(stderr,
  1345. 		        "erresc(38): gfx attr %d unknown\n", attr[*npar]);
  1346. 		break;
  1347. 	}
  1349. 	return idx;
  1350. }
  1352. void
  1353. tsetattr(int *attr, int l)
  1354. {
  1355. 	int i;
  1356. 	int32_t idx;
  1358. 	for (i = 0; i < l; i++) {
  1359. 		switch (attr[i]) {
  1360. 		case 0:
  1361. 			term.c.attr.mode &= ~(
  1362. 				ATTR_BOLD       |
  1363. 				ATTR_FAINT      |
  1364. 				ATTR_ITALIC     |
  1365. 				ATTR_UNDERLINE  |
  1366. 				ATTR_BLINK      |
  1367. 				ATTR_REVERSE    |
  1368. 				ATTR_INVISIBLE  |
  1369. 				ATTR_STRUCK     );
  1370. 			term.c.attr.fg = defaultfg;
  1371. 			term.c.attr.bg = defaultbg;
  1372. 			break;
  1373. 		case 1:
  1374. 			term.c.attr.mode |= ATTR_BOLD;
  1375. 			break;
  1376. 		case 2:
  1377. 			term.c.attr.mode |= ATTR_FAINT;
  1378. 			break;
  1379. 		case 3:
  1380. 			term.c.attr.mode |= ATTR_ITALIC;
  1381. 			break;
  1382. 		case 4:
  1383. 			term.c.attr.mode |= ATTR_UNDERLINE;
  1384. 			break;
  1385. 		case 5: /* slow blink */
  1386. 			/* FALLTHROUGH */
  1387. 		case 6: /* rapid blink */
  1388. 			term.c.attr.mode |= ATTR_BLINK;
  1389. 			break;
  1390. 		case 7:
  1391. 			term.c.attr.mode |= ATTR_REVERSE;
  1392. 			break;
  1393. 		case 8:
  1394. 			term.c.attr.mode |= ATTR_INVISIBLE;
  1395. 			break;
  1396. 		case 9:
  1397. 			term.c.attr.mode |= ATTR_STRUCK;
  1398. 			break;
  1399. 		case 22:
  1400. 			term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT);
  1401. 			break;
  1402. 		case 23:
  1403. 			term.c.attr.mode &= ~ATTR_ITALIC;
  1404. 			break;
  1405. 		case 24:
  1406. 			term.c.attr.mode &= ~ATTR_UNDERLINE;
  1407. 			break;
  1408. 		case 25:
  1409. 			term.c.attr.mode &= ~ATTR_BLINK;
  1410. 			break;
  1411. 		case 27:
  1412. 			term.c.attr.mode &= ~ATTR_REVERSE;
  1413. 			break;
  1414. 		case 28:
  1415. 			term.c.attr.mode &= ~ATTR_INVISIBLE;
  1416. 			break;
  1417. 		case 29:
  1418. 			term.c.attr.mode &= ~ATTR_STRUCK;
  1419. 			break;
  1420. 		case 38:
  1421. 			if ((idx = tdefcolor(attr, &i, l)) >= 0)
  1422. 				term.c.attr.fg = idx;
  1423. 			break;
  1424. 		case 39:
  1425. 			term.c.attr.fg = defaultfg;
  1426. 			break;
  1427. 		case 48:
  1428. 			if ((idx = tdefcolor(attr, &i, l)) >= 0)
  1429. 				term.c.attr.bg = idx;
  1430. 			break;
  1431. 		case 49:
  1432. 			term.c.attr.bg = defaultbg;
  1433. 			break;
  1434. 		default:
  1435. 			if (BETWEEN(attr[i], 30, 37)) {
  1436. 				term.c.attr.fg = attr[i] - 30;
  1437. 			} else if (BETWEEN(attr[i], 40, 47)) {
  1438. 				term.c.attr.bg = attr[i] - 40;
  1439. 			} else if (BETWEEN(attr[i], 90, 97)) {
  1440. 				term.c.attr.fg = attr[i] - 90 + 8;
  1441. 			} else if (BETWEEN(attr[i], 100, 107)) {
  1442. 				term.c.attr.bg = attr[i] - 100 + 8;
  1443. 			} else {
  1444. 				fprintf(stderr,
  1445. 					"erresc(default): gfx attr %d unknown\n",
  1446. 					attr[i]);
  1447. 				csidump();
  1448. 			}
  1449. 			break;
  1450. 		}
  1451. 	}
  1452. }
  1454. void
  1455. tsetscroll(int t, int b)
  1456. {
  1457. 	int temp;
  1459. 	LIMIT(t, 0, term.row-1);
  1460. 	LIMIT(b, 0, term.row-1);
  1461. 	if (t > b) {
  1462. 		temp = t;
  1463. 		t = b;
  1464. 		b = temp;
  1465. 	}
  1466. 	term.top = t;
  1467. 	term.bot = b;
  1468. }
  1470. void
  1471. tsetmode(int priv, int set, int *args, int narg)
  1472. {
  1473. 	int alt, *lim;
  1475. 	for (lim = args + narg; args < lim; ++args) {
  1476. 		if (priv) {
  1477. 			switch (*args) {
  1478. 			case 1: /* DECCKM -- Cursor key */
  1479. 				xsetmode(set, MODE_APPCURSOR);
  1480. 				break;
  1481. 			case 5: /* DECSCNM -- Reverse video */
  1482. 				xsetmode(set, MODE_REVERSE);
  1483. 				break;
  1484. 			case 6: /* DECOM -- Origin */
  1485. 				MODBIT(term.c.state, set, CURSOR_ORIGIN);
  1486. 				tmoveato(0, 0);
  1487. 				break;
  1488. 			case 7: /* DECAWM -- Auto wrap */
  1489. 				MODBIT(term.mode, set, MODE_WRAP);
  1490. 				break;
  1491. 			case 0:  /* Error (IGNORED) */
  1492. 			case 2:  /* DECANM -- ANSI/VT52 (IGNORED) */
  1493. 			case 3:  /* DECCOLM -- Column  (IGNORED) */
  1494. 			case 4:  /* DECSCLM -- Scroll (IGNORED) */
  1495. 			case 8:  /* DECARM -- Auto repeat (IGNORED) */
  1496. 			case 18: /* DECPFF -- Printer feed (IGNORED) */
  1497. 			case 19: /* DECPEX -- Printer extent (IGNORED) */
  1498. 			case 42: /* DECNRCM -- National characters (IGNORED) */
  1499. 			case 12: /* att610 -- Start blinking cursor (IGNORED) */
  1500. 				break;
  1501. 			case 25: /* DECTCEM -- Text Cursor Enable Mode */
  1502. 				xsetmode(!set, MODE_HIDE);
  1503. 				break;
  1504. 			case 9:    /* X10 mouse compatibility mode */
  1505. 				xsetpointermotion(0);
  1506. 				xsetmode(0, MODE_MOUSE);
  1507. 				xsetmode(set, MODE_MOUSEX10);
  1508. 				break;
  1509. 			case 1000: /* 1000: report button press */
  1510. 				xsetpointermotion(0);
  1511. 				xsetmode(0, MODE_MOUSE);
  1512. 				xsetmode(set, MODE_MOUSEBTN);
  1513. 				break;
  1514. 			case 1002: /* 1002: report motion on button press */
  1515. 				xsetpointermotion(0);
  1516. 				xsetmode(0, MODE_MOUSE);
  1517. 				xsetmode(set, MODE_MOUSEMOTION);
  1518. 				break;
  1519. 			case 1003: /* 1003: enable all mouse motions */
  1520. 				xsetpointermotion(set);
  1521. 				xsetmode(0, MODE_MOUSE);
  1522. 				xsetmode(set, MODE_MOUSEMANY);
  1523. 				break;
  1524. 			case 1004: /* 1004: send focus events to tty */
  1525. 				xsetmode(set, MODE_FOCUS);
  1526. 				break;
  1527. 			case 1006: /* 1006: extended reporting mode */
  1528. 				xsetmode(set, MODE_MOUSESGR);
  1529. 				break;
  1530. 			case 1034:
  1531. 				xsetmode(set, MODE_8BIT);
  1532. 				break;
  1533. 			case 1049: /* swap screen & set/restore cursor as xterm */
  1534. 				if (!allowaltscreen)
  1535. 					break;
  1536. 				tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
  1537. 				/* FALLTHROUGH */
  1538. 			case 47: /* swap screen */
  1539. 			case 1047:
  1540. 				if (!allowaltscreen)
  1541. 					break;
  1542. 				alt = IS_SET(MODE_ALTSCREEN);
  1543. 				if (alt) {
  1544. 					tclearregion(0, 0, term.col-1,
  1545. 							term.row-1);
  1546. 				}
  1547. 				if (set ^ alt) /* set is always 1 or 0 */
  1548. 					tswapscreen();
  1549. 				if (*args != 1049)
  1550. 					break;
  1551. 				/* FALLTHROUGH */
  1552. 			case 1048:
  1553. 				tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD);
  1554. 				break;
  1555. 			case 2004: /* 2004: bracketed paste mode */
  1556. 				xsetmode(set, MODE_BRCKTPASTE);
  1557. 				break;
  1558. 			/* Not implemented mouse modes. See comments there. */
  1559. 			case 1001: /* mouse highlight mode; can hang the
  1560. 				      terminal by design when implemented. */
  1561. 			case 1005: /* UTF-8 mouse mode; will confuse
  1562. 				      applications not supporting UTF-8
  1563. 				      and luit. */
  1564. 			case 1015: /* urxvt mangled mouse mode; incompatible
  1565. 				      and can be mistaken for other control
  1566. 				      codes. */
  1567. 				break;
  1568. 			default:
  1569. 				fprintf(stderr,
  1570. 					"erresc: unknown private set/reset mode %d\n",
  1571. 					*args);
  1572. 				break;
  1573. 			}
  1574. 		} else {
  1575. 			switch (*args) {
  1576. 			case 0:  /* Error (IGNORED) */
  1577. 				break;
  1578. 			case 2:
  1579. 				xsetmode(set, MODE_KBDLOCK);
  1580. 				break;
  1581. 			case 4:  /* IRM -- Insertion-replacement */
  1582. 				MODBIT(term.mode, set, MODE_INSERT);
  1583. 				break;
  1584. 			case 12: /* SRM -- Send/Receive */
  1585. 				MODBIT(term.mode, !set, MODE_ECHO);
  1586. 				break;
  1587. 			case 20: /* LNM -- Linefeed/new line */
  1588. 				MODBIT(term.mode, set, MODE_CRLF);
  1589. 				break;
  1590. 			default:
  1591. 				fprintf(stderr,
  1592. 					"erresc: unknown set/reset mode %d\n",
  1593. 					*args);
  1594. 				break;
  1595. 			}
  1596. 		}
  1597. 	}
  1598. }
  1600. void
  1601. csihandle(void)
  1602. {
  1603. 	char buf[40];
  1604. 	int len;
  1606. 	switch (csiescseq.mode[0]) {
  1607. 	default:
  1608. 	unknown:
  1609. 		fprintf(stderr, "erresc: unknown csi ");
  1610. 		csidump();
  1611. 		/* die(""); */
  1612. 		break;
  1613. 	case '@': /* ICH -- Insert <n> blank char */
  1614. 		DEFAULT(csiescseq.arg[0], 1);
  1615. 		tinsertblank(csiescseq.arg[0]);
  1616. 		break;
  1617. 	case 'A': /* CUU -- Cursor <n> Up */
  1618. 		DEFAULT(csiescseq.arg[0], 1);
  1619. 		tmoveto(term.c.x, term.c.y-csiescseq.arg[0]);
  1620. 		break;
  1621. 	case 'B': /* CUD -- Cursor <n> Down */
  1622. 	case 'e': /* VPR --Cursor <n> Down */
  1623. 		DEFAULT(csiescseq.arg[0], 1);
  1624. 		tmoveto(term.c.x, term.c.y+csiescseq.arg[0]);
  1625. 		break;
  1626. 	case 'i': /* MC -- Media Copy */
  1627. 		switch (csiescseq.arg[0]) {
  1628. 		case 0:
  1629. 			tdump();
  1630. 			break;
  1631. 		case 1:
  1632. 			tdumpline(term.c.y);
  1633. 			break;
  1634. 		case 2:
  1635. 			tdumpsel();
  1636. 			break;
  1637. 		case 4:
  1638. 			term.mode &= ~MODE_PRINT;
  1639. 			break;
  1640. 		case 5:
  1641. 			term.mode |= MODE_PRINT;
  1642. 			break;
  1643. 		}
  1644. 		break;
  1645. 	case 'c': /* DA -- Device Attributes */
  1646. 		if (csiescseq.arg[0] == 0)
  1647. 			ttywrite(vtiden, strlen(vtiden), 0);
  1648. 		break;
  1649. 	case 'b': /* REP -- if last char is printable print it <n> more times */
  1650. 		DEFAULT(csiescseq.arg[0], 1);
  1651. 		if (term.lastc)
  1652. 			while (csiescseq.arg[0]-- > 0)
  1653. 				tputc(term.lastc);
  1654. 		break;
  1655. 	case 'C': /* CUF -- Cursor <n> Forward */
  1656. 	case 'a': /* HPR -- Cursor <n> Forward */
  1657. 		DEFAULT(csiescseq.arg[0], 1);
  1658. 		tmoveto(term.c.x+csiescseq.arg[0], term.c.y);
  1659. 		break;
  1660. 	case 'D': /* CUB -- Cursor <n> Backward */
  1661. 		DEFAULT(csiescseq.arg[0], 1);
  1662. 		tmoveto(term.c.x-csiescseq.arg[0], term.c.y);
  1663. 		break;
  1664. 	case 'E': /* CNL -- Cursor <n> Down and first col */
  1665. 		DEFAULT(csiescseq.arg[0], 1);
  1666. 		tmoveto(0, term.c.y+csiescseq.arg[0]);
  1667. 		break;
  1668. 	case 'F': /* CPL -- Cursor <n> Up and first col */
  1669. 		DEFAULT(csiescseq.arg[0], 1);
  1670. 		tmoveto(0, term.c.y-csiescseq.arg[0]);
  1671. 		break;
  1672. 	case 'g': /* TBC -- Tabulation clear */
  1673. 		switch (csiescseq.arg[0]) {
  1674. 		case 0: /* clear current tab stop */
  1675. 			term.tabs[term.c.x] = 0;
  1676. 			break;
  1677. 		case 3: /* clear all the tabs */
  1678. 			memset(term.tabs, 0, term.col * sizeof(*term.tabs));
  1679. 			break;
  1680. 		default:
  1681. 			goto unknown;
  1682. 		}
  1683. 		break;
  1684. 	case 'G': /* CHA -- Move to <col> */
  1685. 	case '`': /* HPA */
  1686. 		DEFAULT(csiescseq.arg[0], 1);
  1687. 		tmoveto(csiescseq.arg[0]-1, term.c.y);
  1688. 		break;
  1689. 	case 'H': /* CUP -- Move to <row> <col> */
  1690. 	case 'f': /* HVP */
  1691. 		DEFAULT(csiescseq.arg[0], 1);
  1692. 		DEFAULT(csiescseq.arg[1], 1);
  1693. 		tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1);
  1694. 		break;
  1695. 	case 'I': /* CHT -- Cursor Forward Tabulation <n> tab stops */
  1696. 		DEFAULT(csiescseq.arg[0], 1);
  1697. 		tputtab(csiescseq.arg[0]);
  1698. 		break;
  1699. 	case 'J': /* ED -- Clear screen */
  1700. 		switch (csiescseq.arg[0]) {
  1701. 		case 0: /* below */
  1702. 			tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
  1703. 			if (term.c.y < term.row-1) {
  1704. 				tclearregion(0, term.c.y+1, term.col-1,
  1705. 						term.row-1);
  1706. 			}
  1707. 			break;
  1708. 		case 1: /* above */
  1709. 			if (term.c.y > 1)
  1710. 				tclearregion(0, 0, term.col-1, term.c.y-1);
  1711. 			tclearregion(0, term.c.y, term.c.x, term.c.y);
  1712. 			break;
  1713. 		case 2: /* all */
  1714. 			tclearregion(0, 0, term.col-1, term.row-1);
  1715. 			break;
  1716. 		default:
  1717. 			goto unknown;
  1718. 		}
  1719. 		break;
  1720. 	case 'K': /* EL -- Clear line */
  1721. 		switch (csiescseq.arg[0]) {
  1722. 		case 0: /* right */
  1723. 			tclearregion(term.c.x, term.c.y, term.col-1,
  1724. 					term.c.y);
  1725. 			break;
  1726. 		case 1: /* left */
  1727. 			tclearregion(0, term.c.y, term.c.x, term.c.y);
  1728. 			break;
  1729. 		case 2: /* all */
  1730. 			tclearregion(0, term.c.y, term.col-1, term.c.y);
  1731. 			break;
  1732. 		}
  1733. 		break;
  1734. 	case 'S': /* SU -- Scroll <n> line up */
  1735. 		DEFAULT(csiescseq.arg[0], 1);
  1736. 		tscrollup(term.top, csiescseq.arg[0]);
  1737. 		break;
  1738. 	case 'T': /* SD -- Scroll <n> line down */
  1739. 		DEFAULT(csiescseq.arg[0], 1);
  1740. 		tscrolldown(term.top, csiescseq.arg[0]);
  1741. 		break;
  1742. 	case 'L': /* IL -- Insert <n> blank lines */
  1743. 		DEFAULT(csiescseq.arg[0], 1);
  1744. 		tinsertblankline(csiescseq.arg[0]);
  1745. 		break;
  1746. 	case 'l': /* RM -- Reset Mode */
  1747. 		tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg);
  1748. 		break;
  1749. 	case 'M': /* DL -- Delete <n> lines */
  1750. 		DEFAULT(csiescseq.arg[0], 1);
  1751. 		tdeleteline(csiescseq.arg[0]);
  1752. 		break;
  1753. 	case 'X': /* ECH -- Erase <n> char */
  1754. 		DEFAULT(csiescseq.arg[0], 1);
  1755. 		tclearregion(term.c.x, term.c.y,
  1756. 				term.c.x + csiescseq.arg[0] - 1, term.c.y);
  1757. 		break;
  1758. 	case 'P': /* DCH -- Delete <n> char */
  1759. 		DEFAULT(csiescseq.arg[0], 1);
  1760. 		tdeletechar(csiescseq.arg[0]);
  1761. 		break;
  1762. 	case 'Z': /* CBT -- Cursor Backward Tabulation <n> tab stops */
  1763. 		DEFAULT(csiescseq.arg[0], 1);
  1764. 		tputtab(-csiescseq.arg[0]);
  1765. 		break;
  1766. 	case 'd': /* VPA -- Move to <row> */
  1767. 		DEFAULT(csiescseq.arg[0], 1);
  1768. 		tmoveato(term.c.x, csiescseq.arg[0]-1);
  1769. 		break;
  1770. 	case 'h': /* SM -- Set terminal mode */
  1771. 		tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg);
  1772. 		break;
  1773. 	case 'm': /* SGR -- Terminal attribute (color) */
  1774. 		tsetattr(csiescseq.arg, csiescseq.narg);
  1775. 		break;
  1776. 	case 'n': /* DSR – Device Status Report (cursor position) */
  1777. 		if (csiescseq.arg[0] == 6) {
  1778. 			len = snprintf(buf, sizeof(buf), "\033[%i;%iR",
  1779. 					term.c.y+1, term.c.x+1);
  1780. 			ttywrite(buf, len, 0);
  1781. 		}
  1782. 		break;
  1783. 	case 'r': /* DECSTBM -- Set Scrolling Region */
  1784. 		if (csiescseq.priv) {
  1785. 			goto unknown;
  1786. 		} else {
  1787. 			DEFAULT(csiescseq.arg[0], 1);
  1788. 			DEFAULT(csiescseq.arg[1], term.row);
  1789. 			tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1);
  1790. 			tmoveato(0, 0);
  1791. 		}
  1792. 		break;
  1793. 	case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
  1794. 		tcursor(CURSOR_SAVE);
  1795. 		break;
  1796. 	case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
  1797. 		tcursor(CURSOR_LOAD);
  1798. 		break;
  1799. 	case ' ':
  1800. 		switch (csiescseq.mode[1]) {
  1801. 		case 'q': /* DECSCUSR -- Set Cursor Style */
  1802. 			if (xsetcursor(csiescseq.arg[0]))
  1803. 				goto unknown;
  1804. 			break;
  1805. 		default:
  1806. 			goto unknown;
  1807. 		}
  1808. 		break;
  1809. 	}
  1810. }
  1812. void
  1813. csidump(void)
  1814. {
  1815. 	size_t i;
  1816. 	uint c;
  1818. 	fprintf(stderr, "ESC[");
  1819. 	for (i = 0; i < csiescseq.len; i++) {
  1820. 		c = csiescseq.buf[i] & 0xff;
  1821. 		if (isprint(c)) {
  1822. 			putc(c, stderr);
  1823. 		} else if (c == '\n') {
  1824. 			fprintf(stderr, "(\\n)");
  1825. 		} else if (c == '\r') {
  1826. 			fprintf(stderr, "(\\r)");
  1827. 		} else if (c == 0x1b) {
  1828. 			fprintf(stderr, "(\\e)");
  1829. 		} else {
  1830. 			fprintf(stderr, "(%02x)", c);
  1831. 		}
  1832. 	}
  1833. 	putc('\n', stderr);
  1834. }
  1836. void
  1837. csireset(void)
  1838. {
  1839. 	memset(&csiescseq, 0, sizeof(csiescseq));
  1840. }
  1842. void
  1843. strhandle(void)
  1844. {
  1845. 	char *p = NULL, *dec;
  1846. 	int j, narg, par;
  1848. 	term.esc &= ~(ESC_STR_END|ESC_STR);
  1849. 	strparse();
  1850. 	par = (narg = strescseq.narg) ? atoi(strescseq.args[0]) : 0;
  1852. 	switch (strescseq.type) {
  1853. 	case ']': /* OSC -- Operating System Command */
  1854. 		switch (par) {
  1855. 		case 0:
  1856. 		case 1:
  1857. 		case 2:
  1858. 			if (narg > 1)
  1859. 				xsettitle(strescseq.args[1]);
  1860. 			return;
  1861. 		case 52:
  1862. 			if (narg > 2 && allowwindowops) {
  1863. 				dec = base64dec(strescseq.args[2]);
  1864. 				if (dec) {
  1865. 					xsetsel(dec);
  1866. 					xclipcopy();
  1867. 				} else {
  1868. 					fprintf(stderr, "erresc: invalid base64\n");
  1869. 				}
  1870. 			}
  1871. 			return;
  1872. 		case 4: /* color set */
  1873. 			if (narg < 3)
  1874. 				break;
  1875. 			p = strescseq.args[2];
  1876. 			/* FALLTHROUGH */
  1877. 		case 104: /* color reset, here p = NULL */
  1878. 			j = (narg > 1) ? atoi(strescseq.args[1]) : -1;
  1879. 			if (xsetcolorname(j, p)) {
  1880. 				if (par == 104 && narg <= 1)
  1881. 					return; /* color reset without parameter */
  1882. 				fprintf(stderr, "erresc: invalid color j=%d, p=%s\n",
  1883. 				        j, p ? p : "(null)");
  1884. 			} else {
  1885. 				/*
  1886. 				 * TODO if defaultbg color is changed, borders
  1887. 				 * are dirty
  1888. 				 */
  1889. 				redraw();
  1890. 			}
  1891. 			return;
  1892. 		}
  1893. 		break;
  1894. 	case 'k': /* old title set compatibility */
  1895. 		xsettitle(strescseq.args[0]);
  1896. 		return;
  1897. 	case 'P': /* DCS -- Device Control String */
  1898. 	case '_': /* APC -- Application Program Command */
  1899. 	case '^': /* PM -- Privacy Message */
  1900. 		return;
  1901. 	}
  1903. 	fprintf(stderr, "erresc: unknown str ");
  1904. 	strdump();
  1905. }
  1907. void
  1908. strparse(void)
  1909. {
  1910. 	int c;
  1911. 	char *p = strescseq.buf;
  1913. 	strescseq.narg = 0;
  1914. 	strescseq.buf[strescseq.len] = '\0';
  1916. 	if (*p == '\0')
  1917. 		return;
  1919. 	while (strescseq.narg < STR_ARG_SIZ) {
  1920. 		strescseq.args[strescseq.narg++] = p;
  1921. 		while ((c = *p) != ';' && c != '\0')
  1922. 			++p;
  1923. 		if (c == '\0')
  1924. 			return;
  1925. 		*p++ = '\0';
  1926. 	}
  1927. }
  1929. void
  1930. strdump(void)
  1931. {
  1932. 	size_t i;
  1933. 	uint c;
  1935. 	fprintf(stderr, "ESC%c", strescseq.type);
  1936. 	for (i = 0; i < strescseq.len; i++) {
  1937. 		c = strescseq.buf[i] & 0xff;
  1938. 		if (c == '\0') {
  1939. 			putc('\n', stderr);
  1940. 			return;
  1941. 		} else if (isprint(c)) {
  1942. 			putc(c, stderr);
  1943. 		} else if (c == '\n') {
  1944. 			fprintf(stderr, "(\\n)");
  1945. 		} else if (c == '\r') {
  1946. 			fprintf(stderr, "(\\r)");
  1947. 		} else if (c == 0x1b) {
  1948. 			fprintf(stderr, "(\\e)");
  1949. 		} else {
  1950. 			fprintf(stderr, "(%02x)", c);
  1951. 		}
  1952. 	}
  1953. 	fprintf(stderr, "ESC\\\n");
  1954. }
  1956. void
  1957. strreset(void)
  1958. {
  1959. 	strescseq = (STREscape){
  1960. 		.buf = xrealloc(strescseq.buf, STR_BUF_SIZ),
  1961. 		.siz = STR_BUF_SIZ,
  1962. 	};
  1963. }
  1965. void
  1966. sendbreak(const Arg *arg)
  1967. {
  1968. 	if (tcsendbreak(cmdfd, 0))
  1969. 		perror("Error sending break");
  1970. }
  1972. void
  1973. tprinter(char *s, size_t len)
  1974. {
  1975. 	if (iofd != -1 && xwrite(iofd, s, len) < 0) {
  1976. 		perror("Error writing to output file");
  1977. 		close(iofd);
  1978. 		iofd = -1;
  1979. 	}
  1980. }
  1982. void
  1983. toggleprinter(const Arg *arg)
  1984. {
  1985. 	term.mode ^= MODE_PRINT;
  1986. }
  1988. void
  1989. printscreen(const Arg *arg)
  1990. {
  1991. 	tdump();
  1992. }
  1994. void
  1995. printsel(const Arg *arg)
  1996. {
  1997. 	tdumpsel();
  1998. }
  2000. void
  2001. tdumpsel(void)
  2002. {
  2003. 	char *ptr;
  2005. 	if ((ptr = getsel())) {
  2006. 		tprinter(ptr, strlen(ptr));
  2007. 		free(ptr);
  2008. 	}
  2009. }
  2011. void
  2012. tdumpline(int n)
  2013. {
  2014. 	char buf[UTF_SIZ];
  2015. 	Glyph *bp, *end;
  2017. 	bp = &term.line[n][0];
  2018. 	end = &bp[MIN(tlinelen(n), term.col) - 1];
  2019. 	if (bp != end || bp->u != ' ') {
  2020. 		for ( ; bp <= end; ++bp)
  2021. 			tprinter(buf, utf8encode(bp->u, buf));
  2022. 	}
  2023. 	tprinter("\n", 1);
  2024. }
  2026. void
  2027. tdump(void)
  2028. {
  2029. 	int i;
  2031. 	for (i = 0; i < term.row; ++i)
  2032. 		tdumpline(i);
  2033. }
  2035. void
  2036. tputtab(int n)
  2037. {
  2038. 	uint x = term.c.x;
  2040. 	if (n > 0) {
  2041. 		while (x < term.col && n--)
  2042. 			for (++x; x < term.col && !term.tabs[x]; ++x)
  2043. 				/* nothing */ ;
  2044. 	} else if (n < 0) {
  2045. 		while (x > 0 && n++)
  2046. 			for (--x; x > 0 && !term.tabs[x]; --x)
  2047. 				/* nothing */ ;
  2048. 	}
  2049. 	term.c.x = LIMIT(x, 0, term.col-1);
  2050. }
  2052. void
  2053. tdefutf8(char ascii)
  2054. {
  2055. 	if (ascii == 'G')
  2056. 		term.mode |= MODE_UTF8;
  2057. 	else if (ascii == '@')
  2058. 		term.mode &= ~MODE_UTF8;
  2059. }
  2061. void
  2062. tdeftran(char ascii)
  2063. {
  2064. 	static char cs[] = "0B";
  2065. 	static int vcs[] = {CS_GRAPHIC0, CS_USA};
  2066. 	char *p;
  2068. 	if ((p = strchr(cs, ascii)) == NULL) {
  2069. 		fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii);
  2070. 	} else {
  2071. 		term.trantbl[term.icharset] = vcs[p - cs];
  2072. 	}
  2073. }
  2075. void
  2076. tdectest(char c)
  2077. {
  2078. 	int x, y;
  2080. 	if (c == '8') { /* DEC screen alignment test. */
  2081. 		for (x = 0; x < term.col; ++x) {
  2082. 			for (y = 0; y < term.row; ++y)
  2083. 				tsetchar('E', &term.c.attr, x, y);
  2084. 		}
  2085. 	}
  2086. }
  2088. void
  2089. tstrsequence(uchar c)
  2090. {
  2091. 	switch (c) {
  2092. 	case 0x90:   /* DCS -- Device Control String */
  2093. 		c = 'P';
  2094. 		break;
  2095. 	case 0x9f:   /* APC -- Application Program Command */
  2096. 		c = '_';
  2097. 		break;
  2098. 	case 0x9e:   /* PM -- Privacy Message */
  2099. 		c = '^';
  2100. 		break;
  2101. 	case 0x9d:   /* OSC -- Operating System Command */
  2102. 		c = ']';
  2103. 		break;
  2104. 	}
  2105. 	strreset();
  2106. 	strescseq.type = c;
  2107. 	term.esc |= ESC_STR;
  2108. }
  2110. void
  2111. tcontrolcode(uchar ascii)
  2112. {
  2113. 	switch (ascii) {
  2114. 	case '\t':   /* HT */
  2115. 		tputtab(1);
  2116. 		return;
  2117. 	case '\b':   /* BS */
  2118. 		tmoveto(term.c.x-1, term.c.y);
  2119. 		return;
  2120. 	case '\r':   /* CR */
  2121. 		tmoveto(0, term.c.y);
  2122. 		return;
  2123. 	case '\f':   /* LF */
  2124. 	case '\v':   /* VT */
  2125. 	case '\n':   /* LF */
  2126. 		/* go to first col if the mode is set */
  2127. 		tnewline(IS_SET(MODE_CRLF));
  2128. 		return;
  2129. 	case '\a':   /* BEL */
  2130. 		if (term.esc & ESC_STR_END) {
  2131. 			/* backwards compatibility to xterm */
  2132. 			strhandle();
  2133. 		} else {
  2134. 			xbell();
  2135. 		}
  2136. 		break;
  2137. 	case '\033': /* ESC */
  2138. 		csireset();
  2139. 		term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST);
  2140. 		term.esc |= ESC_START;
  2141. 		return;
  2142. 	case '\016': /* SO (LS1 -- Locking shift 1) */
  2143. 	case '\017': /* SI (LS0 -- Locking shift 0) */
  2144. 		term.charset = 1 - (ascii - '\016');
  2145. 		return;
  2146. 	case '\032': /* SUB */
  2147. 		tsetchar('?', &term.c.attr, term.c.x, term.c.y);
  2148. 		/* FALLTHROUGH */
  2149. 	case '\030': /* CAN */
  2150. 		csireset();
  2151. 		break;
  2152. 	case '\005': /* ENQ (IGNORED) */
  2153. 	case '\000': /* NUL (IGNORED) */
  2154. 	case '\021': /* XON (IGNORED) */
  2155. 	case '\023': /* XOFF (IGNORED) */
  2156. 	case 0177:   /* DEL (IGNORED) */
  2157. 		return;
  2158. 	case 0x80:   /* TODO: PAD */
  2159. 	case 0x81:   /* TODO: HOP */
  2160. 	case 0x82:   /* TODO: BPH */
  2161. 	case 0x83:   /* TODO: NBH */
  2162. 	case 0x84:   /* TODO: IND */
  2163. 		break;
  2164. 	case 0x85:   /* NEL -- Next line */
  2165. 		tnewline(1); /* always go to first col */
  2166. 		break;
  2167. 	case 0x86:   /* TODO: SSA */
  2168. 	case 0x87:   /* TODO: ESA */
  2169. 		break;
  2170. 	case 0x88:   /* HTS -- Horizontal tab stop */
  2171. 		term.tabs[term.c.x] = 1;
  2172. 		break;
  2173. 	case 0x89:   /* TODO: HTJ */
  2174. 	case 0x8a:   /* TODO: VTS */
  2175. 	case 0x8b:   /* TODO: PLD */
  2176. 	case 0x8c:   /* TODO: PLU */
  2177. 	case 0x8d:   /* TODO: RI */
  2178. 	case 0x8e:   /* TODO: SS2 */
  2179. 	case 0x8f:   /* TODO: SS3 */
  2180. 	case 0x91:   /* TODO: PU1 */
  2181. 	case 0x92:   /* TODO: PU2 */
  2182. 	case 0x93:   /* TODO: STS */
  2183. 	case 0x94:   /* TODO: CCH */
  2184. 	case 0x95:   /* TODO: MW */
  2185. 	case 0x96:   /* TODO: SPA */
  2186. 	case 0x97:   /* TODO: EPA */
  2187. 	case 0x98:   /* TODO: SOS */
  2188. 	case 0x99:   /* TODO: SGCI */
  2189. 		break;
  2190. 	case 0x9a:   /* DECID -- Identify Terminal */
  2191. 		ttywrite(vtiden, strlen(vtiden), 0);
  2192. 		break;
  2193. 	case 0x9b:   /* TODO: CSI */
  2194. 	case 0x9c:   /* TODO: ST */
  2195. 		break;
  2196. 	case 0x90:   /* DCS -- Device Control String */
  2197. 	case 0x9d:   /* OSC -- Operating System Command */
  2198. 	case 0x9e:   /* PM -- Privacy Message */
  2199. 	case 0x9f:   /* APC -- Application Program Command */
  2200. 		tstrsequence(ascii);
  2201. 		return;
  2202. 	}
  2203. 	/* only CAN, SUB, \a and C1 chars interrupt a sequence */
  2204. 	term.esc &= ~(ESC_STR_END|ESC_STR);
  2205. }
  2207. /*
  2208.  * returns 1 when the sequence is finished and it hasn't to read
  2209.  * more characters for this sequence, otherwise 0
  2210.  */
  2211. int
  2212. eschandle(uchar ascii)
  2213. {
  2214. 	switch (ascii) {
  2215. 	case '[':
  2216. 		term.esc |= ESC_CSI;
  2217. 		return 0;
  2218. 	case '#':
  2219. 		term.esc |= ESC_TEST;
  2220. 		return 0;
  2221. 	case '%':
  2222. 		term.esc |= ESC_UTF8;
  2223. 		return 0;
  2224. 	case 'P': /* DCS -- Device Control String */
  2225. 	case '_': /* APC -- Application Program Command */
  2226. 	case '^': /* PM -- Privacy Message */
  2227. 	case ']': /* OSC -- Operating System Command */
  2228. 	case 'k': /* old title set compatibility */
  2229. 		tstrsequence(ascii);
  2230. 		return 0;
  2231. 	case 'n': /* LS2 -- Locking shift 2 */
  2232. 	case 'o': /* LS3 -- Locking shift 3 */
  2233. 		term.charset = 2 + (ascii - 'n');
  2234. 		break;
  2235. 	case '(': /* GZD4 -- set primary charset G0 */
  2236. 	case ')': /* G1D4 -- set secondary charset G1 */
  2237. 	case '*': /* G2D4 -- set tertiary charset G2 */
  2238. 	case '+': /* G3D4 -- set quaternary charset G3 */
  2239. 		term.icharset = ascii - '(';
  2240. 		term.esc |= ESC_ALTCHARSET;
  2241. 		return 0;
  2242. 	case 'D': /* IND -- Linefeed */
  2243. 		if (term.c.y == term.bot) {
  2244. 			tscrollup(term.top, 1);
  2245. 		} else {
  2246. 			tmoveto(term.c.x, term.c.y+1);
  2247. 		}
  2248. 		break;
  2249. 	case 'E': /* NEL -- Next line */
  2250. 		tnewline(1); /* always go to first col */
  2251. 		break;
  2252. 	case 'H': /* HTS -- Horizontal tab stop */
  2253. 		term.tabs[term.c.x] = 1;
  2254. 		break;
  2255. 	case 'M': /* RI -- Reverse index */
  2256. 		if (term.c.y == term.top) {
  2257. 			tscrolldown(term.top, 1);
  2258. 		} else {
  2259. 			tmoveto(term.c.x, term.c.y-1);
  2260. 		}
  2261. 		break;
  2262. 	case 'Z': /* DECID -- Identify Terminal */
  2263. 		ttywrite(vtiden, strlen(vtiden), 0);
  2264. 		break;
  2265. 	case 'c': /* RIS -- Reset to initial state */
  2266. 		treset();
  2267. 		resettitle();
  2268. 		xloadcols();
  2269. 		break;
  2270. 	case '=': /* DECPAM -- Application keypad */
  2271. 		xsetmode(1, MODE_APPKEYPAD);
  2272. 		break;
  2273. 	case '>': /* DECPNM -- Normal keypad */
  2274. 		xsetmode(0, MODE_APPKEYPAD);
  2275. 		break;
  2276. 	case '7': /* DECSC -- Save Cursor */
  2277. 		tcursor(CURSOR_SAVE);
  2278. 		break;
  2279. 	case '8': /* DECRC -- Restore Cursor */
  2280. 		tcursor(CURSOR_LOAD);
  2281. 		break;
  2282. 	case '\\': /* ST -- String Terminator */
  2283. 		if (term.esc & ESC_STR_END)
  2284. 			strhandle();
  2285. 		break;
  2286. 	default:
  2287. 		fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n",
  2288. 			(uchar) ascii, isprint(ascii)? ascii:'.');
  2289. 		break;
  2290. 	}
  2291. 	return 1;
  2292. }
  2294. void
  2295. tputc(Rune u)
  2296. {
  2297. 	char c[UTF_SIZ];
  2298. 	int control;
  2299. 	int width, len;
  2300. 	Glyph *gp;
  2302. 	control = ISCONTROL(u);
  2303. 	if (u < 127 || !IS_SET(MODE_UTF8)) {
  2304. 		c[0] = u;
  2305. 		width = len = 1;
  2306. 	} else {
  2307. 		len = utf8encode(u, c);
  2308. 		if (!control && (width = wcwidth(u)) == -1)
  2309. 			width = 1;
  2310. 	}
  2312. 	if (IS_SET(MODE_PRINT))
  2313. 		tprinter(c, len);
  2315. 	/*
  2316. 	 * STR sequence must be checked before anything else
  2317. 	 * because it uses all following characters until it
  2318. 	 * receives a ESC, a SUB, a ST or any other C1 control
  2319. 	 * character.
  2320. 	 */
  2321. 	if (term.esc & ESC_STR) {
  2322. 		if (u == '\a' || u == 030 || u == 032 || u == 033 ||
  2323. 		   ISCONTROLC1(u)) {
  2324. 			term.esc &= ~(ESC_START|ESC_STR);
  2325. 			term.esc |= ESC_STR_END;
  2326. 			goto check_control_code;
  2327. 		}
  2329. 		if (strescseq.len+len >= strescseq.siz) {
  2330. 			/*
  2331. 			 * Here is a bug in terminals. If the user never sends
  2332. 			 * some code to stop the str or esc command, then st
  2333. 			 * will stop responding. But this is better than
  2334. 			 * silently failing with unknown characters. At least
  2335. 			 * then users will report back.
  2336. 			 *
  2337. 			 * In the case users ever get fixed, here is the code:
  2338. 			 */
  2339. 			/*
  2340. 			 * term.esc = 0;
  2341. 			 * strhandle();
  2342. 			 */
  2343. 			if (strescseq.siz > (SIZE_MAX - UTF_SIZ) / 2)
  2344. 				return;
  2345. 			strescseq.siz *= 2;
  2346. 			strescseq.buf = xrealloc(strescseq.buf, strescseq.siz);
  2347. 		}
  2349. 		memmove(&strescseq.buf[strescseq.len], c, len);
  2350. 		strescseq.len += len;
  2351. 		return;
  2352. 	}
  2354. check_control_code:
  2355. 	/*
  2356. 	 * Actions of control codes must be performed as soon they arrive
  2357. 	 * because they can be embedded inside a control sequence, and
  2358. 	 * they must not cause conflicts with sequences.
  2359. 	 */
  2360. 	if (control) {
  2361. 		tcontrolcode(u);
  2362. 		/*
  2363. 		 * control codes are not shown ever
  2364. 		 */
  2365. 		if (!term.esc)
  2366. 			term.lastc = 0;
  2367. 		return;
  2368. 	} else if (term.esc & ESC_START) {
  2369. 		if (term.esc & ESC_CSI) {
  2370. 			csiescseq.buf[csiescseq.len++] = u;
  2371. 			if (BETWEEN(u, 0x40, 0x7E)
  2372. 					|| csiescseq.len >= \
  2373. 					sizeof(csiescseq.buf)-1) {
  2374. 				term.esc = 0;
  2375. 				csiparse();
  2376. 				csihandle();
  2377. 			}
  2378. 			return;
  2379. 		} else if (term.esc & ESC_UTF8) {
  2380. 			tdefutf8(u);
  2381. 		} else if (term.esc & ESC_ALTCHARSET) {
  2382. 			tdeftran(u);
  2383. 		} else if (term.esc & ESC_TEST) {
  2384. 			tdectest(u);
  2385. 		} else {
  2386. 			if (!eschandle(u))
  2387. 				return;
  2388. 			/* sequence already finished */
  2389. 		}
  2390. 		term.esc = 0;
  2391. 		/*
  2392. 		 * All characters which form part of a sequence are not
  2393. 		 * printed
  2394. 		 */
  2395. 		return;
  2396. 	}
  2397. 	if (selected(term.c.x, term.c.y))
  2398. 		selclear();
  2400. 	gp = &term.line[term.c.y][term.c.x];
  2401. 	if (IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) {
  2402. 		gp->mode |= ATTR_WRAP;
  2403. 		tnewline(1);
  2404. 		gp = &term.line[term.c.y][term.c.x];
  2405. 	}
  2407. 	if (IS_SET(MODE_INSERT) && term.c.x+width < term.col)
  2408. 		memmove(gp+width, gp, (term.col - term.c.x - width) * sizeof(Glyph));
  2410. 	if (term.c.x+width > term.col) {
  2411. 		tnewline(1);
  2412. 		gp = &term.line[term.c.y][term.c.x];
  2413. 	}
  2415. 	tsetchar(u, &term.c.attr, term.c.x, term.c.y);
  2416. 	term.lastc = u;
  2418. 	if (width == 2) {
  2419. 		gp->mode |= ATTR_WIDE;
  2420. 		if (term.c.x+1 < term.col) {
  2421. 			gp[1].u = '\0';
  2422. 			gp[1].mode = ATTR_WDUMMY;
  2423. 		}
  2424. 	}
  2425. 	if (term.c.x+width < term.col) {
  2426. 		tmoveto(term.c.x+width, term.c.y);
  2427. 	} else {
  2428. 		term.c.state |= CURSOR_WRAPNEXT;
  2429. 	}
  2430. }
  2432. int
  2433. twrite(const char *buf, int buflen, int show_ctrl)
  2434. {
  2435. 	int charsize;
  2436. 	Rune u;
  2437. 	int n;
  2439. 	for (n = 0; n < buflen; n += charsize) {
  2440. 		if (IS_SET(MODE_UTF8)) {
  2441. 			/* process a complete utf8 char */
  2442. 			charsize = utf8decode(buf + n, &u, buflen - n);
  2443. 			if (charsize == 0)
  2444. 				break;
  2445. 		} else {
  2446. 			u = buf[n] & 0xFF;
  2447. 			charsize = 1;
  2448. 		}
  2449. 		if (show_ctrl && ISCONTROL(u)) {
  2450. 			if (u & 0x80) {
  2451. 				u &= 0x7f;
  2452. 				tputc('^');
  2453. 				tputc('[');
  2454. 			} else if (u != '\n' && u != '\r' && u != '\t') {
  2455. 				u ^= 0x40;
  2456. 				tputc('^');
  2457. 			}
  2458. 		}
  2459. 		tputc(u);
  2460. 	}
  2461. 	return n;
  2462. }
  2464. void
  2465. tresize(int col, int row)
  2466. {
  2467. 	int i;
  2468. 	int minrow = MIN(row, term.row);
  2469. 	int mincol = MIN(col, term.col);
  2470. 	int *bp;
  2471. 	TCursor c;
  2473. 	if (col < 1 || row < 1) {
  2474. 		fprintf(stderr,
  2475. 		        "tresize: error resizing to %dx%d\n", col, row);
  2476. 		return;
  2477. 	}
  2479. 	/*
  2480. 	 * slide screen to keep cursor where we expect it -
  2481. 	 * tscrollup would work here, but we can optimize to
  2482. 	 * memmove because we're freeing the earlier lines
  2483. 	 */
  2484. 	for (i = 0; i <= term.c.y - row; i++) {
  2485. 		free(term.line[i]);
  2486. 		free(term.alt[i]);
  2487. 	}
  2488. 	/* ensure that both src and dst are not NULL */
  2489. 	if (i > 0) {
  2490. 		memmove(term.line, term.line + i, row * sizeof(Line));
  2491. 		memmove(term.alt, term.alt + i, row * sizeof(Line));
  2492. 	}
  2493. 	for (i += row; i < term.row; i++) {
  2494. 		free(term.line[i]);
  2495. 		free(term.alt[i]);
  2496. 	}
  2498. 	/* resize to new height */
  2499. 	term.line = xrealloc(term.line, row * sizeof(Line));
  2500. 	term.alt  = xrealloc(term.alt,  row * sizeof(Line));
  2501. 	term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty));
  2502. 	term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs));
  2504. 	/* resize each row to new width, zero-pad if needed */
  2505. 	for (i = 0; i < minrow; i++) {
  2506. 		term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph));
  2507. 		term.alt[i]  = xrealloc(term.alt[i],  col * sizeof(Glyph));
  2508. 	}
  2510. 	/* allocate any new rows */
  2511. 	for (/* i = minrow */; i < row; i++) {
  2512. 		term.line[i] = xmalloc(col * sizeof(Glyph));
  2513. 		term.alt[i] = xmalloc(col * sizeof(Glyph));
  2514. 	}
  2515. 	if (col > term.col) {
  2516. 		bp = term.tabs + term.col;
  2518. 		memset(bp, 0, sizeof(*term.tabs) * (col - term.col));
  2519. 		while (--bp > term.tabs && !*bp)
  2520. 			/* nothing */ ;
  2521. 		for (bp += tabspaces; bp < term.tabs + col; bp += tabspaces)
  2522. 			*bp = 1;
  2523. 	}
  2524. 	/* update terminal size */
  2525. 	term.col = col;
  2526. 	term.row = row;
  2527. 	/* reset scrolling region */
  2528. 	tsetscroll(0, row-1);
  2529. 	/* make use of the LIMIT in tmoveto */
  2530. 	tmoveto(term.c.x, term.c.y);
  2531. 	/* Clearing both screens (it makes dirty all lines) */
  2532. 	c = term.c;
  2533. 	for (i = 0; i < 2; i++) {
  2534. 		if (mincol < col && 0 < minrow) {
  2535. 			tclearregion(mincol, 0, col - 1, minrow - 1);
  2536. 		}
  2537. 		if (0 < col && minrow < row) {
  2538. 			tclearregion(0, minrow, col - 1, row - 1);
  2539. 		}
  2540. 		tswapscreen();
  2541. 		tcursor(CURSOR_LOAD);
  2542. 	}
  2543. 	term.c = c;
  2544. }
  2546. void
  2547. resettitle(void)
  2548. {
  2549. 	xsettitle(NULL);
  2550. }
  2552. void
  2553. drawregion(int x1, int y1, int x2, int y2)
  2554. {
  2555. 	int y;
  2557. 	for (y = y1; y < y2; y++) {
  2558. 		if (!term.dirty[y])
  2559. 			continue;
  2561. 		term.dirty[y] = 0;
  2562. 		xdrawline(term.line[y], x1, y, x2);
  2563. 	}
  2564. }
  2566. void
  2567. draw(void)
  2568. {
  2569. 	int cx = term.c.x, ocx = term.ocx, ocy = term.ocy;
  2571. 	if (!xstartdraw())
  2572. 		return;
  2574. 	/* adjust cursor position */
  2575. 	LIMIT(term.ocx, 0, term.col-1);
  2576. 	LIMIT(term.ocy, 0, term.row-1);
  2577. 	if (term.line[term.ocy][term.ocx].mode & ATTR_WDUMMY)
  2578. 		term.ocx--;
  2579. 	if (term.line[term.c.y][cx].mode & ATTR_WDUMMY)
  2580. 		cx--;
  2582. 	drawregion(0, 0, term.col, term.row);
  2583. 	xdrawcursor(cx, term.c.y, term.line[term.c.y][cx],
  2584. 			term.ocx, term.ocy, term.line[term.ocy][term.ocx]);
  2585. 	term.ocx = cx;
  2586. 	term.ocy = term.c.y;
  2587. 	xfinishdraw();
  2588. 	if (ocx != term.ocx || ocy != term.ocy)
  2589. 		xximspot(term.ocx, term.ocy);
  2590. }
  2592. void
  2593. redraw(void)
  2594. {
  2595. 	tfulldirt();
  2596. 	draw();
  2597. }