/* See LICENSE for license details. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "st.h" #include "win.h" #if defined(__linux) #include #elif defined(__OpenBSD__) || defined(__NetBSD__) || defined(__APPLE__) #include #elif defined(__FreeBSD__) || defined(__DragonFly__) #include #endif /* Arbitrary sizes */ #define UTF_INVALID 0xFFFD #define UTF_SIZ 4 #define ESC_BUF_SIZ (128*UTF_SIZ) #define ESC_ARG_SIZ 16 #define STR_BUF_SIZ ESC_BUF_SIZ #define STR_ARG_SIZ ESC_ARG_SIZ #define HISTSIZE 2000 /* macros */ #define IS_SET(flag) ((term.mode & (flag)) != 0) #define ISCONTROLC0(c) (BETWEEN(c, 0, 0x1f) || (c) == 0x7f) #define ISCONTROLC1(c) (BETWEEN(c, 0x80, 0x9f)) #define ISCONTROL(c) (ISCONTROLC0(c) || ISCONTROLC1(c)) #define ISDELIM(u) (u && wcschr(worddelimiters, u)) #define TLINE(y) ((y) < term.scr ? term.hist[((y) + term.histi - \ term.scr + HISTSIZE + 1) % HISTSIZE] : \ term.line[(y) - term.scr]) enum term_mode { MODE_WRAP = 1 << 0, MODE_INSERT = 1 << 1, MODE_ALTSCREEN = 1 << 2, MODE_CRLF = 1 << 3, MODE_ECHO = 1 << 4, MODE_PRINT = 1 << 5, MODE_UTF8 = 1 << 6, }; enum cursor_movement { CURSOR_SAVE, CURSOR_LOAD }; enum cursor_state { CURSOR_DEFAULT = 0, CURSOR_WRAPNEXT = 1, CURSOR_ORIGIN = 2 }; enum charset { CS_GRAPHIC0, CS_GRAPHIC1, CS_UK, CS_USA, CS_MULTI, CS_GER, CS_FIN }; enum escape_state { ESC_START = 1, ESC_CSI = 2, ESC_STR = 4, /* DCS, OSC, PM, APC */ ESC_ALTCHARSET = 8, ESC_STR_END = 16, /* a final string was encountered */ ESC_TEST = 32, /* Enter in test mode */ ESC_UTF8 = 64, }; typedef struct { Glyph attr; /* current char attributes */ int x; int y; char state; } TCursor; typedef struct { int mode; int type; int snap; /* * Selection variables: * nb – normalized coordinates of the beginning of the selection * ne – normalized coordinates of the end of the selection * ob – original coordinates of the beginning of the selection * oe – original coordinates of the end of the selection */ struct { int x, y; } nb, ne, ob, oe; int alt; } Selection; /* Internal representation of the screen */ typedef struct { int row; /* nb row */ int col; /* nb col */ Line *line; /* screen */ Line *alt; /* alternate screen */ Line hist[HISTSIZE]; /* history buffer */ int histi; /* history index */ int scr; /* scroll back */ int *dirty; /* dirtyness of lines */ TCursor c; /* cursor */ int ocx; /* old cursor col */ int ocy; /* old cursor row */ int top; /* top scroll limit */ int bot; /* bottom scroll limit */ int mode; /* terminal mode flags */ int esc; /* escape state flags */ char trantbl[4]; /* charset table translation */ int charset; /* current charset */ int icharset; /* selected charset for sequence */ int *tabs; Rune lastc; /* last printed char outside of sequence, 0 if control */ } Term; /* CSI Escape sequence structs */ /* ESC '[' [[ [] [;]] []] */ typedef struct { char buf[ESC_BUF_SIZ]; /* raw string */ size_t len; /* raw string length */ char priv; int arg[ESC_ARG_SIZ]; int narg; /* nb of args */ char mode[2]; } CSIEscape; /* STR Escape sequence structs */ /* ESC type [[ [] [;]] ] ESC '\' */ typedef struct { char type; /* ESC type ... */ char *buf; /* allocated raw string */ size_t siz; /* allocation size */ size_t len; /* raw string length */ char *args[STR_ARG_SIZ]; int narg; /* nb of args */ } STREscape; static void execsh(char *, char **); static int chdir_by_pid(pid_t pid); static void stty(char **); static void sigchld(int); static void ttywriteraw(const char *, size_t); static void csidump(void); static void csihandle(void); static void csiparse(void); static void csireset(void); static void osc_color_response(int, int, int); static int eschandle(uchar); static void strdump(void); static void strhandle(void); static void strparse(void); static void strreset(void); static void tprinter(char *, size_t); static void tdumpsel(void); static void tdumpline(int); static void tdump(void); static void tclearregion(int, int, int, int); static void tcursor(int); static void tdeletechar(int); static void tdeleteline(int); static void tinsertblank(int); static void tinsertblankline(int); static int tlinelen(int); static void tmoveto(int, int); static void tmoveato(int, int); static void tnewline(int); static void tputtab(int); static void tputc(Rune); static void treset(void); static void tscrollup(int, int, int); static void tscrolldown(int, int, int); static void tsetattr(const int *, int); static void tsetchar(Rune, const Glyph *, int, int); static void tsetdirt(int, int); static void tsetscroll(int, int); static void tswapscreen(void); static void tsetmode(int, int, const int *, int); static int twrite(const char *, int, int); static void tfulldirt(void); static void tcontrolcode(uchar ); static void tdectest(char ); static void tdefutf8(char); static int32_t tdefcolor(const int *, int *, int); static void tdeftran(char); static void tstrsequence(uchar); static void drawregion(int, int, int, int); static void selnormalize(void); static void selscroll(int, int); static void selsnap(int *, int *, int); static size_t utf8decode(const char *, Rune *, size_t); static Rune utf8decodebyte(char, size_t *); static char utf8encodebyte(Rune, size_t); static size_t utf8validate(Rune *, size_t); static char *base64dec(const char *); static char base64dec_getc(const char **); static ssize_t xwrite(int, const char *, size_t); /* Globals */ static Term term; static Selection sel; static CSIEscape csiescseq; static STREscape strescseq; static int iofd = 1; static int cmdfd; static pid_t pid; static const uchar utfbyte[UTF_SIZ + 1] = {0x80, 0, 0xC0, 0xE0, 0xF0}; static const uchar utfmask[UTF_SIZ + 1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8}; static const Rune utfmin[UTF_SIZ + 1] = { 0, 0, 0x80, 0x800, 0x10000}; static const Rune utfmax[UTF_SIZ + 1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF}; ssize_t xwrite(int fd, const char *s, size_t len) { size_t aux = len; ssize_t r; while (len > 0) { r = write(fd, s, len); if (r < 0) return r; len -= r; s += r; } return aux; } void * xmalloc(size_t len) { void *p; if (!(p = malloc(len))) die("malloc: %s\n", strerror(errno)); return p; } void * xrealloc(void *p, size_t len) { if ((p = realloc(p, len)) == NULL) die("realloc: %s\n", strerror(errno)); return p; } char * xstrdup(const char *s) { char *p; if ((p = strdup(s)) == NULL) die("strdup: %s\n", strerror(errno)); return p; } size_t utf8decode(const char *c, Rune *u, size_t clen) { size_t i, j, len, type; Rune udecoded; *u = UTF_INVALID; if (!clen) return 0; udecoded = utf8decodebyte(c[0], &len); if (!BETWEEN(len, 1, UTF_SIZ)) return 1; for (i = 1, j = 1; i < clen && j < len; ++i, ++j) { udecoded = (udecoded << 6) | utf8decodebyte(c[i], &type); if (type != 0) return j; } if (j < len) return 0; *u = udecoded; utf8validate(u, len); return len; } Rune utf8decodebyte(char c, size_t *i) { for (*i = 0; *i < LEN(utfmask); ++(*i)) if (((uchar)c & utfmask[*i]) == utfbyte[*i]) return (uchar)c & ~utfmask[*i]; return 0; } size_t utf8encode(Rune u, char *c) { size_t len, i; len = utf8validate(&u, 0); if (len > UTF_SIZ) return 0; for (i = len - 1; i != 0; --i) { c[i] = utf8encodebyte(u, 0); u >>= 6; } c[0] = utf8encodebyte(u, len); return len; } char utf8encodebyte(Rune u, size_t i) { return utfbyte[i] | (u & ~utfmask[i]); } size_t utf8validate(Rune *u, size_t i) { if (!BETWEEN(*u, utfmin[i], utfmax[i]) || BETWEEN(*u, 0xD800, 0xDFFF)) *u = UTF_INVALID; for (i = 1; *u > utfmax[i]; ++i) ; return i; } char base64dec_getc(const char **src) { while (**src && !isprint((unsigned char)**src)) (*src)++; return **src ? *((*src)++) : '='; /* emulate padding if string ends */ } char * base64dec(const char *src) { size_t in_len = strlen(src); char *result, *dst; static const char base64_digits[256] = { [43] = 62, 0, 0, 0, 63, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 0, 0, 0, -1, 0, 0, 0, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 0, 0, 0, 0, 0, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51 }; if (in_len % 4) in_len += 4 - (in_len % 4); result = dst = xmalloc(in_len / 4 * 3 + 1); while (*src) { int a = base64_digits[(unsigned char) base64dec_getc(&src)]; int b = base64_digits[(unsigned char) base64dec_getc(&src)]; int c = base64_digits[(unsigned char) base64dec_getc(&src)]; int d = base64_digits[(unsigned char) base64dec_getc(&src)]; /* invalid input. 'a' can be -1, e.g. if src is "\n" (c-str) */ if (a == -1 || b == -1) break; *dst++ = (a << 2) | ((b & 0x30) >> 4); if (c == -1) break; *dst++ = ((b & 0x0f) << 4) | ((c & 0x3c) >> 2); if (d == -1) break; *dst++ = ((c & 0x03) << 6) | d; } *dst = '\0'; return result; } void selinit(void) { sel.mode = SEL_IDLE; sel.snap = 0; sel.ob.x = -1; } int tlinelen(int y) { int i = term.col; if (TLINE(y)[i - 1].mode & ATTR_WRAP) return i; while (i > 0 && TLINE(y)[i - 1].u == ' ') --i; return i; } void selstart(int col, int row, int snap) { selclear(); sel.mode = SEL_EMPTY; sel.type = SEL_REGULAR; sel.alt = IS_SET(MODE_ALTSCREEN); sel.snap = snap; sel.oe.x = sel.ob.x = col; sel.oe.y = sel.ob.y = row; selnormalize(); if (sel.snap != 0) sel.mode = SEL_READY; tsetdirt(sel.nb.y, sel.ne.y); } void selextend(int col, int row, int type, int done) { int oldey, oldex, oldsby, oldsey, oldtype; if (sel.mode == SEL_IDLE) return; if (done && sel.mode == SEL_EMPTY) { selclear(); return; } oldey = sel.oe.y; oldex = sel.oe.x; oldsby = sel.nb.y; oldsey = sel.ne.y; oldtype = sel.type; sel.oe.x = col; sel.oe.y = row; selnormalize(); sel.type = type; if (oldey != sel.oe.y || oldex != sel.oe.x || oldtype != sel.type || sel.mode == SEL_EMPTY) tsetdirt(MIN(sel.nb.y, oldsby), MAX(sel.ne.y, oldsey)); sel.mode = done ? SEL_IDLE : SEL_READY; } void selnormalize(void) { int i; if (sel.type == SEL_REGULAR && sel.ob.y != sel.oe.y) { sel.nb.x = sel.ob.y < sel.oe.y ? sel.ob.x : sel.oe.x; sel.ne.x = sel.ob.y < sel.oe.y ? sel.oe.x : sel.ob.x; } else { sel.nb.x = MIN(sel.ob.x, sel.oe.x); sel.ne.x = MAX(sel.ob.x, sel.oe.x); } sel.nb.y = MIN(sel.ob.y, sel.oe.y); sel.ne.y = MAX(sel.ob.y, sel.oe.y); selsnap(&sel.nb.x, &sel.nb.y, -1); selsnap(&sel.ne.x, &sel.ne.y, +1); /* expand selection over line breaks */ if (sel.type == SEL_RECTANGULAR) return; i = tlinelen(sel.nb.y); if (i < sel.nb.x) sel.nb.x = i; if (tlinelen(sel.ne.y) <= sel.ne.x) sel.ne.x = term.col - 1; } int selected(int x, int y) { if (sel.mode == SEL_EMPTY || sel.ob.x == -1 || sel.alt != IS_SET(MODE_ALTSCREEN)) return 0; if (sel.type == SEL_RECTANGULAR) return BETWEEN(y, sel.nb.y, sel.ne.y) && BETWEEN(x, sel.nb.x, sel.ne.x); return BETWEEN(y, sel.nb.y, sel.ne.y) && (y != sel.nb.y || x >= sel.nb.x) && (y != sel.ne.y || x <= sel.ne.x); } void selsnap(int *x, int *y, int direction) { int newx, newy, xt, yt; int delim, prevdelim; const Glyph *gp, *prevgp; switch (sel.snap) { case SNAP_WORD: /* * Snap around if the word wraps around at the end or * beginning of a line. */ prevgp = &TLINE(*y)[*x]; prevdelim = ISDELIM(prevgp->u); for (;;) { newx = *x + direction; newy = *y; if (!BETWEEN(newx, 0, term.col - 1)) { newy += direction; newx = (newx + term.col) % term.col; if (!BETWEEN(newy, 0, term.row - 1)) break; if (direction > 0) yt = *y, xt = *x; else yt = newy, xt = newx; if (!(TLINE(yt)[xt].mode & ATTR_WRAP)) break; } if (newx >= tlinelen(newy)) break; gp = &TLINE(newy)[newx]; delim = ISDELIM(gp->u); if (!(gp->mode & ATTR_WDUMMY) && (delim != prevdelim || (delim && gp->u != prevgp->u))) break; *x = newx; *y = newy; prevgp = gp; prevdelim = delim; } break; case SNAP_LINE: /* * Snap around if the the previous line or the current one * has set ATTR_WRAP at its end. Then the whole next or * previous line will be selected. */ *x = (direction < 0) ? 0 : term.col - 1; if (direction < 0) { for (; *y > 0; *y += direction) { if (!(TLINE(*y-1)[term.col-1].mode & ATTR_WRAP)) { break; } } } else if (direction > 0) { for (; *y < term.row-1; *y += direction) { if (!(TLINE(*y)[term.col-1].mode & ATTR_WRAP)) { break; } } } break; } } char * getsel(void) { char *str, *ptr; int y, bufsize, lastx, linelen; const Glyph *gp, *last; if (sel.ob.x == -1) return NULL; bufsize = (term.col+1) * (sel.ne.y-sel.nb.y+1) * UTF_SIZ; ptr = str = xmalloc(bufsize); /* append every set & selected glyph to the selection */ for (y = sel.nb.y; y <= sel.ne.y; y++) { if ((linelen = tlinelen(y)) == 0) { *ptr++ = '\n'; continue; } if (sel.type == SEL_RECTANGULAR) { gp = &TLINE(y)[sel.nb.x]; lastx = sel.ne.x; } else { gp = &TLINE(y)[sel.nb.y == y ? sel.nb.x : 0]; lastx = (sel.ne.y == y) ? sel.ne.x : term.col-1; } last = &TLINE(y)[MIN(lastx, linelen-1)]; while (last >= gp && last->u == ' ') --last; for ( ; gp <= last; ++gp) { if (gp->mode & ATTR_WDUMMY) continue; ptr += utf8encode(gp->u, ptr); } /* * Copy and pasting of line endings is inconsistent * in the inconsistent terminal and GUI world. * The best solution seems like to produce '\n' when * something is copied from st and convert '\n' to * '\r', when something to be pasted is received by * st. * FIXME: Fix the computer world. */ if ((y < sel.ne.y || lastx >= linelen) && (!(last->mode & ATTR_WRAP) || sel.type == SEL_RECTANGULAR)) *ptr++ = '\n'; } *ptr = 0; return str; } void selclear(void) { if (sel.ob.x == -1) return; sel.mode = SEL_IDLE; sel.ob.x = -1; tsetdirt(sel.nb.y, sel.ne.y); } void die(const char *errstr, ...) { va_list ap; va_start(ap, errstr); vfprintf(stderr, errstr, ap); va_end(ap); exit(1); } void execsh(char *cmd, char **args) { char *sh, *prog, *arg; const struct passwd *pw; errno = 0; if ((pw = getpwuid(getuid())) == NULL) { if (errno) die("getpwuid: %s\n", strerror(errno)); else die("who are you?\n"); } if ((sh = getenv("SHELL")) == NULL) sh = (pw->pw_shell[0]) ? pw->pw_shell : cmd; if (args) { prog = args[0]; arg = NULL; } else if (scroll) { prog = scroll; arg = utmp ? utmp : sh; } else if (utmp) { prog = utmp; arg = NULL; } else { prog = sh; arg = NULL; } DEFAULT(args, ((char *[]) {prog, arg, NULL})); unsetenv("COLUMNS"); unsetenv("LINES"); unsetenv("TERMCAP"); setenv("LOGNAME", pw->pw_name, 1); setenv("USER", pw->pw_name, 1); setenv("SHELL", sh, 1); setenv("HOME", pw->pw_dir, 1); setenv("TERM", termname, 1); signal(SIGCHLD, SIG_DFL); signal(SIGHUP, SIG_DFL); signal(SIGINT, SIG_DFL); signal(SIGQUIT, SIG_DFL); signal(SIGTERM, SIG_DFL); signal(SIGALRM, SIG_DFL); execvp(prog, args); _exit(1); } void sigchld(int a) { int stat; pid_t p; if ((p = waitpid(pid, &stat, WNOHANG)) < 0) die("waiting for pid %hd failed: %s\n", pid, strerror(errno)); if (pid != p) { if (p == 0 && wait(&stat) < 0) die("wait: %s\n", strerror(errno)); /* reinstall sigchld handler */ signal(SIGCHLD, sigchld); return; } if (WIFEXITED(stat) && WEXITSTATUS(stat)) die("child exited with status %d\n", WEXITSTATUS(stat)); else if (WIFSIGNALED(stat)) die("child terminated due to signal %d\n", WTERMSIG(stat)); _exit(0); } void stty(char **args) { char cmd[_POSIX_ARG_MAX], **p, *q, *s; size_t n, siz; if ((n = strlen(stty_args)) > sizeof(cmd)-1) die("incorrect stty parameters\n"); memcpy(cmd, stty_args, n); q = cmd + n; siz = sizeof(cmd) - n; for (p = args; p && (s = *p); ++p) { if ((n = strlen(s)) > siz-1) die("stty parameter length too long\n"); *q++ = ' '; memcpy(q, s, n); q += n; siz -= n + 1; } *q = '\0'; if (system(cmd) != 0) perror("Couldn't call stty"); } int ttynew(const char *line, char *cmd, const char *out, char **args) { int m, s; if (out) { term.mode |= MODE_PRINT; iofd = (!strcmp(out, "-")) ? 1 : open(out, O_WRONLY | O_CREAT, 0666); if (iofd < 0) { fprintf(stderr, "Error opening %s:%s\n", out, strerror(errno)); } } if (line) { if ((cmdfd = open(line, O_RDWR)) < 0) die("open line '%s' failed: %s\n", line, strerror(errno)); dup2(cmdfd, 0); stty(args); return cmdfd; } /* seems to work fine on linux, openbsd and freebsd */ if (openpty(&m, &s, NULL, NULL, NULL) < 0) die("openpty failed: %s\n", strerror(errno)); switch (pid = fork()) { case -1: die("fork failed: %s\n", strerror(errno)); break; case 0: close(iofd); close(m); setsid(); /* create a new process group */ dup2(s, 0); dup2(s, 1); dup2(s, 2); if (ioctl(s, TIOCSCTTY, NULL) < 0) die("ioctl TIOCSCTTY failed: %s\n", strerror(errno)); if (s > 2) close(s); #ifdef __OpenBSD__ if (pledge("stdio getpw proc exec", NULL) == -1) die("pledge\n"); #endif execsh(cmd, args); break; default: #ifdef __OpenBSD__ if (pledge("stdio rpath tty proc", NULL) == -1) die("pledge\n"); #endif close(s); cmdfd = m; signal(SIGCHLD, sigchld); break; } return cmdfd; } size_t ttyread(void) { static char buf[BUFSIZ]; static int buflen = 0; int ret, written; /* append read bytes to unprocessed bytes */ ret = read(cmdfd, buf+buflen, LEN(buf)-buflen); switch (ret) { case 0: exit(0); case -1: die("couldn't read from shell: %s\n", strerror(errno)); default: buflen += ret; written = twrite(buf, buflen, 0); buflen -= written; /* keep any incomplete UTF-8 byte sequence for the next call */ if (buflen > 0) memmove(buf, buf + written, buflen); return ret; } } void ttywrite(const char *s, size_t n, int may_echo) { const char *next; Arg arg = (Arg) { .i = term.scr }; kscrolldown(&arg); if (may_echo && IS_SET(MODE_ECHO)) twrite(s, n, 1); if (!IS_SET(MODE_CRLF)) { ttywriteraw(s, n); return; } /* This is similar to how the kernel handles ONLCR for ttys */ while (n > 0) { if (*s == '\r') { next = s + 1; ttywriteraw("\r\n", 2); } else { next = memchr(s, '\r', n); DEFAULT(next, s + n); ttywriteraw(s, next - s); } n -= next - s; s = next; } } void ttywriteraw(const char *s, size_t n) { fd_set wfd, rfd; ssize_t r; size_t lim = 256; /* * Remember that we are using a pty, which might be a modem line. * Writing too much will clog the line. That's why we are doing this * dance. * FIXME: Migrate the world to Plan 9. */ while (n > 0) { FD_ZERO(&wfd); FD_ZERO(&rfd); FD_SET(cmdfd, &wfd); FD_SET(cmdfd, &rfd); /* Check if we can write. */ if (pselect(cmdfd+1, &rfd, &wfd, NULL, NULL, NULL) < 0) { if (errno == EINTR) continue; die("select failed: %s\n", strerror(errno)); } if (FD_ISSET(cmdfd, &wfd)) { /* * Only write the bytes written by ttywrite() or the * default of 256. This seems to be a reasonable value * for a serial line. Bigger values might clog the I/O. */ if ((r = write(cmdfd, s, (n < lim)? n : lim)) < 0) goto write_error; if (r < n) { /* * We weren't able to write out everything. * This means the buffer is getting full * again. Empty it. */ if (n < lim) lim = ttyread(); n -= r; s += r; } else { /* All bytes have been written. */ break; } } if (FD_ISSET(cmdfd, &rfd)) lim = ttyread(); } return; write_error: die("write error on tty: %s\n", strerror(errno)); } void ttyresize(int tw, int th) { struct winsize w; w.ws_row = term.row; w.ws_col = term.col; w.ws_xpixel = tw; w.ws_ypixel = th; if (ioctl(cmdfd, TIOCSWINSZ, &w) < 0) fprintf(stderr, "Couldn't set window size: %s\n", strerror(errno)); } void ttyhangup(void) { /* Send SIGHUP to shell */ kill(pid, SIGHUP); } int tattrset(int attr) { int i, j; for (i = 0; i < term.row-1; i++) { for (j = 0; j < term.col-1; j++) { if (term.line[i][j].mode & attr) return 1; } } return 0; } void tsetdirt(int top, int bot) { int i; LIMIT(top, 0, term.row-1); LIMIT(bot, 0, term.row-1); for (i = top; i <= bot; i++) term.dirty[i] = 1; } void tsetdirtattr(int attr) { int i, j; for (i = 0; i < term.row-1; i++) { for (j = 0; j < term.col-1; j++) { if (term.line[i][j].mode & attr) { tsetdirt(i, i); break; } } } } void tfulldirt(void) { tsetdirt(0, term.row-1); } void tcursor(int mode) { static TCursor c[2]; int alt = IS_SET(MODE_ALTSCREEN); if (mode == CURSOR_SAVE) { c[alt] = term.c; } else if (mode == CURSOR_LOAD) { term.c = c[alt]; tmoveto(c[alt].x, c[alt].y); } } void treset(void) { uint i; term.c = (TCursor){{ .mode = ATTR_NULL, .fg = defaultfg, .bg = defaultbg }, .x = 0, .y = 0, .state = CURSOR_DEFAULT}; memset(term.tabs, 0, term.col * sizeof(*term.tabs)); for (i = tabspaces; i < term.col; i += tabspaces) term.tabs[i] = 1; term.top = 0; term.bot = term.row - 1; term.mode = MODE_WRAP|MODE_UTF8; memset(term.trantbl, CS_USA, sizeof(term.trantbl)); term.charset = 0; for (i = 0; i < 2; i++) { tmoveto(0, 0); tcursor(CURSOR_SAVE); tclearregion(0, 0, term.col-1, term.row-1); tswapscreen(); } } void tnew(int col, int row) { term = (Term){ .c = { .attr = { .fg = defaultfg, .bg = defaultbg } } }; tresize(col, row); treset(); } int tisaltscr(void) { return IS_SET(MODE_ALTSCREEN); } void tswapscreen(void) { Line *tmp = term.line; term.line = term.alt; term.alt = tmp; term.mode ^= MODE_ALTSCREEN; tfulldirt(); } void kscrolldown(const Arg* a) { int n = a->i; if (n < 0) n = term.row + n; if (n > term.scr) n = term.scr; if (term.scr > 0) { term.scr -= n; selscroll(0, -n); tfulldirt(); } } void kscrollup(const Arg* a) { int n = a->i; if (n < 0) n = term.row + n; if (term.scr <= HISTSIZE-n) { term.scr += n; selscroll(0, n); tfulldirt(); } } void newterm(const Arg* a) { switch (fork()) { case -1: die("fork failed: %s\n", strerror(errno)); break; case 0: switch (fork()) { case -1: die("fork failed: %s\n", strerror(errno)); break; case 0: chdir_by_pid(pid); execlp("st", "st"); exit(1); break; default: exit(0); } } } static int chdir_by_pid(pid_t pid) { char buf[32]; snprintf(buf, sizeof buf, "/proc/%ld/cwd", (long)pid); return chdir(buf); } void tscrolldown(int orig, int n, int copyhist) { int i; Line temp; LIMIT(n, 0, term.bot-orig+1); if (copyhist) { term.histi = (term.histi - 1 + HISTSIZE) % HISTSIZE; temp = term.hist[term.histi]; term.hist[term.histi] = term.line[term.bot]; term.line[term.bot] = temp; } tsetdirt(orig, term.bot-n); tclearregion(0, term.bot-n+1, term.col-1, term.bot); for (i = term.bot; i >= orig+n; i--) { temp = term.line[i]; term.line[i] = term.line[i-n]; term.line[i-n] = temp; } if (term.scr == 0) selscroll(orig, n); } void tscrollup(int orig, int n, int copyhist) { int i; Line temp; LIMIT(n, 0, term.bot-orig+1); if (copyhist) { term.histi = (term.histi + 1) % HISTSIZE; temp = term.hist[term.histi]; term.hist[term.histi] = term.line[orig]; term.line[orig] = temp; } if (term.scr > 0 && term.scr < HISTSIZE) term.scr = MIN(term.scr + n, HISTSIZE-1); tclearregion(0, orig, term.col-1, orig+n-1); tsetdirt(orig+n, term.bot); for (i = orig; i <= term.bot-n; i++) { temp = term.line[i]; term.line[i] = term.line[i+n]; term.line[i+n] = temp; } if (term.scr == 0) selscroll(orig, -n); } void selscroll(int orig, int n) { if (sel.ob.x == -1 || sel.alt != IS_SET(MODE_ALTSCREEN)) return; if (BETWEEN(sel.nb.y, orig, term.bot) != BETWEEN(sel.ne.y, orig, term.bot)) { selclear(); } else if (BETWEEN(sel.nb.y, orig, term.bot)) { sel.ob.y += n; sel.oe.y += n; if (sel.ob.y < term.top || sel.ob.y > term.bot || sel.oe.y < term.top || sel.oe.y > term.bot) { selclear(); } else { selnormalize(); } } } void tnewline(int first_col) { int y = term.c.y; if (y == term.bot) { tscrollup(term.top, 1, 1); } else { y++; } tmoveto(first_col ? 0 : term.c.x, y); } void csiparse(void) { char *p = csiescseq.buf, *np; long int v; csiescseq.narg = 0; if (*p == '?') { csiescseq.priv = 1; p++; } csiescseq.buf[csiescseq.len] = '\0'; while (p < csiescseq.buf+csiescseq.len) { np = NULL; v = strtol(p, &np, 10); if (np == p) v = 0; if (v == LONG_MAX || v == LONG_MIN) v = -1; csiescseq.arg[csiescseq.narg++] = v; p = np; if (*p != ';' || csiescseq.narg == ESC_ARG_SIZ) break; p++; } csiescseq.mode[0] = *p++; csiescseq.mode[1] = (p < csiescseq.buf+csiescseq.len) ? *p : '\0'; } /* for absolute user moves, when decom is set */ void tmoveato(int x, int y) { tmoveto(x, y + ((term.c.state & CURSOR_ORIGIN) ? term.top: 0)); } void tmoveto(int x, int y) { int miny, maxy; if (term.c.state & CURSOR_ORIGIN) { miny = term.top; maxy = term.bot; } else { miny = 0; maxy = term.row - 1; } term.c.state &= ~CURSOR_WRAPNEXT; term.c.x = LIMIT(x, 0, term.col-1); term.c.y = LIMIT(y, miny, maxy); } void tsetchar(Rune u, const Glyph *attr, int x, int y) { static const char *vt100_0[62] = { /* 0x41 - 0x7e */ "↑", "↓", "→", "←", "█", "▚", "☃", /* A - G */ 0, 0, 0, 0, 0, 0, 0, 0, /* H - O */ 0, 0, 0, 0, 0, 0, 0, 0, /* P - W */ 0, 0, 0, 0, 0, 0, 0, " ", /* X - _ */ "◆", "▒", "␉", "␌", "␍", "␊", "°", "±", /* ` - g */ "␤", "␋", "┘", "┐", "┌", "└", "┼", "⎺", /* h - o */ "⎻", "─", "⎼", "⎽", "├", "┤", "┴", "┬", /* p - w */ "│", "≤", "≥", "π", "≠", "£", "·", /* x - ~ */ }; /* * The table is proudly stolen from rxvt. */ if (term.trantbl[term.charset] == CS_GRAPHIC0 && BETWEEN(u, 0x41, 0x7e) && vt100_0[u - 0x41]) utf8decode(vt100_0[u - 0x41], &u, UTF_SIZ); if (term.line[y][x].mode & ATTR_WIDE) { if (x+1 < term.col) { term.line[y][x+1].u = ' '; term.line[y][x+1].mode &= ~ATTR_WDUMMY; } } else if (term.line[y][x].mode & ATTR_WDUMMY) { term.line[y][x-1].u = ' '; term.line[y][x-1].mode &= ~ATTR_WIDE; } term.dirty[y] = 1; term.line[y][x] = *attr; term.line[y][x].u = u; } void tclearregion(int x1, int y1, int x2, int y2) { int x, y, temp; Glyph *gp; if (x1 > x2) temp = x1, x1 = x2, x2 = temp; if (y1 > y2) temp = y1, y1 = y2, y2 = temp; LIMIT(x1, 0, term.col-1); LIMIT(x2, 0, term.col-1); LIMIT(y1, 0, term.row-1); LIMIT(y2, 0, term.row-1); for (y = y1; y <= y2; y++) { term.dirty[y] = 1; for (x = x1; x <= x2; x++) { gp = &term.line[y][x]; if (selected(x, y)) selclear(); gp->fg = term.c.attr.fg; gp->bg = term.c.attr.bg; gp->mode = 0; gp->u = ' '; } } } void tdeletechar(int n) { int dst, src, size; Glyph *line; LIMIT(n, 0, term.col - term.c.x); dst = term.c.x; src = term.c.x + n; size = term.col - src; line = term.line[term.c.y]; memmove(&line[dst], &line[src], size * sizeof(Glyph)); tclearregion(term.col-n, term.c.y, term.col-1, term.c.y); } void tinsertblank(int n) { int dst, src, size; Glyph *line; LIMIT(n, 0, term.col - term.c.x); dst = term.c.x + n; src = term.c.x; size = term.col - dst; line = term.line[term.c.y]; memmove(&line[dst], &line[src], size * sizeof(Glyph)); tclearregion(src, term.c.y, dst - 1, term.c.y); } void tinsertblankline(int n) { if (BETWEEN(term.c.y, term.top, term.bot)) tscrolldown(term.c.y, n, 0); } void tdeleteline(int n) { if (BETWEEN(term.c.y, term.top, term.bot)) tscrollup(term.c.y, n, 0); } int32_t tdefcolor(const int *attr, int *npar, int l) { int32_t idx = -1; uint r, g, b; switch (attr[*npar + 1]) { case 2: /* direct color in RGB space */ if (*npar + 4 >= l) { fprintf(stderr, "erresc(38): Incorrect number of parameters (%d)\n", *npar); break; } r = attr[*npar + 2]; g = attr[*npar + 3]; b = attr[*npar + 4]; *npar += 4; if (!BETWEEN(r, 0, 255) || !BETWEEN(g, 0, 255) || !BETWEEN(b, 0, 255)) fprintf(stderr, "erresc: bad rgb color (%u,%u,%u)\n", r, g, b); else idx = TRUECOLOR(r, g, b); break; case 5: /* indexed color */ if (*npar + 2 >= l) { fprintf(stderr, "erresc(38): Incorrect number of parameters (%d)\n", *npar); break; } *npar += 2; if (!BETWEEN(attr[*npar], 0, 255)) fprintf(stderr, "erresc: bad fgcolor %d\n", attr[*npar]); else idx = attr[*npar]; break; case 0: /* implemented defined (only foreground) */ case 1: /* transparent */ case 3: /* direct color in CMY space */ case 4: /* direct color in CMYK space */ default: fprintf(stderr, "erresc(38): gfx attr %d unknown\n", attr[*npar]); break; } return idx; } void tsetattr(const int *attr, int l) { int i; int32_t idx; for (i = 0; i < l; i++) { switch (attr[i]) { case 0: term.c.attr.mode &= ~( ATTR_BOLD | ATTR_FAINT | ATTR_ITALIC | ATTR_UNDERLINE | ATTR_BLINK | ATTR_REVERSE | ATTR_INVISIBLE | ATTR_STRUCK ); term.c.attr.fg = defaultfg; term.c.attr.bg = defaultbg; break; case 1: term.c.attr.mode |= ATTR_BOLD; break; case 2: term.c.attr.mode |= ATTR_FAINT; break; case 3: term.c.attr.mode |= ATTR_ITALIC; break; case 4: term.c.attr.mode |= ATTR_UNDERLINE; break; case 5: /* slow blink */ /* FALLTHROUGH */ case 6: /* rapid blink */ term.c.attr.mode |= ATTR_BLINK; break; case 7: term.c.attr.mode |= ATTR_REVERSE; break; case 8: term.c.attr.mode |= ATTR_INVISIBLE; break; case 9: term.c.attr.mode |= ATTR_STRUCK; break; case 22: term.c.attr.mode &= ~(ATTR_BOLD | ATTR_FAINT); break; case 23: term.c.attr.mode &= ~ATTR_ITALIC; break; case 24: term.c.attr.mode &= ~ATTR_UNDERLINE; break; case 25: term.c.attr.mode &= ~ATTR_BLINK; break; case 27: term.c.attr.mode &= ~ATTR_REVERSE; break; case 28: term.c.attr.mode &= ~ATTR_INVISIBLE; break; case 29: term.c.attr.mode &= ~ATTR_STRUCK; break; case 38: if ((idx = tdefcolor(attr, &i, l)) >= 0) term.c.attr.fg = idx; break; case 39: term.c.attr.fg = defaultfg; break; case 48: if ((idx = tdefcolor(attr, &i, l)) >= 0) term.c.attr.bg = idx; break; case 49: term.c.attr.bg = defaultbg; break; default: if (BETWEEN(attr[i], 30, 37)) { term.c.attr.fg = attr[i] - 30; } else if (BETWEEN(attr[i], 40, 47)) { term.c.attr.bg = attr[i] - 40; } else if (BETWEEN(attr[i], 90, 97)) { term.c.attr.fg = attr[i] - 90 + 8; } else if (BETWEEN(attr[i], 100, 107)) { term.c.attr.bg = attr[i] - 100 + 8; } else { fprintf(stderr, "erresc(default): gfx attr %d unknown\n", attr[i]); csidump(); } break; } } } void tsetscroll(int t, int b) { int temp; LIMIT(t, 0, term.row-1); LIMIT(b, 0, term.row-1); if (t > b) { temp = t; t = b; b = temp; } term.top = t; term.bot = b; } void tsetmode(int priv, int set, const int *args, int narg) { int alt; const int *lim; for (lim = args + narg; args < lim; ++args) { if (priv) { switch (*args) { case 1: /* DECCKM -- Cursor key */ xsetmode(set, MODE_APPCURSOR); break; case 5: /* DECSCNM -- Reverse video */ xsetmode(set, MODE_REVERSE); break; case 6: /* DECOM -- Origin */ MODBIT(term.c.state, set, CURSOR_ORIGIN); tmoveato(0, 0); break; case 7: /* DECAWM -- Auto wrap */ MODBIT(term.mode, set, MODE_WRAP); break; case 0: /* Error (IGNORED) */ case 2: /* DECANM -- ANSI/VT52 (IGNORED) */ case 3: /* DECCOLM -- Column (IGNORED) */ case 4: /* DECSCLM -- Scroll (IGNORED) */ case 8: /* DECARM -- Auto repeat (IGNORED) */ case 18: /* DECPFF -- Printer feed (IGNORED) */ case 19: /* DECPEX -- Printer extent (IGNORED) */ case 42: /* DECNRCM -- National characters (IGNORED) */ case 12: /* att610 -- Start blinking cursor (IGNORED) */ break; case 25: /* DECTCEM -- Text Cursor Enable Mode */ xsetmode(!set, MODE_HIDE); break; case 9: /* X10 mouse compatibility mode */ xsetpointermotion(0); xsetmode(0, MODE_MOUSE); xsetmode(set, MODE_MOUSEX10); break; case 1000: /* 1000: report button press */ xsetpointermotion(0); xsetmode(0, MODE_MOUSE); xsetmode(set, MODE_MOUSEBTN); break; case 1002: /* 1002: report motion on button press */ xsetpointermotion(0); xsetmode(0, MODE_MOUSE); xsetmode(set, MODE_MOUSEMOTION); break; case 1003: /* 1003: enable all mouse motions */ xsetpointermotion(set); xsetmode(0, MODE_MOUSE); xsetmode(set, MODE_MOUSEMANY); break; case 1004: /* 1004: send focus events to tty */ xsetmode(set, MODE_FOCUS); break; case 1006: /* 1006: extended reporting mode */ xsetmode(set, MODE_MOUSESGR); break; case 1034: xsetmode(set, MODE_8BIT); break; case 1049: /* swap screen & set/restore cursor as xterm */ if (!allowaltscreen) break; tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD); /* FALLTHROUGH */ case 47: /* swap screen */ case 1047: if (!allowaltscreen) break; alt = IS_SET(MODE_ALTSCREEN); if (alt) { tclearregion(0, 0, term.col-1, term.row-1); } if (set ^ alt) /* set is always 1 or 0 */ tswapscreen(); if (*args != 1049) break; /* FALLTHROUGH */ case 1048: tcursor((set) ? CURSOR_SAVE : CURSOR_LOAD); break; case 2004: /* 2004: bracketed paste mode */ xsetmode(set, MODE_BRCKTPASTE); break; /* Not implemented mouse modes. See comments there. */ case 1001: /* mouse highlight mode; can hang the terminal by design when implemented. */ case 1005: /* UTF-8 mouse mode; will confuse applications not supporting UTF-8 and luit. */ case 1015: /* urxvt mangled mouse mode; incompatible and can be mistaken for other control codes. */ break; default: fprintf(stderr, "erresc: unknown private set/reset mode %d\n", *args); break; } } else { switch (*args) { case 0: /* Error (IGNORED) */ break; case 2: xsetmode(set, MODE_KBDLOCK); break; case 4: /* IRM -- Insertion-replacement */ MODBIT(term.mode, set, MODE_INSERT); break; case 12: /* SRM -- Send/Receive */ MODBIT(term.mode, !set, MODE_ECHO); break; case 20: /* LNM -- Linefeed/new line */ MODBIT(term.mode, set, MODE_CRLF); break; default: fprintf(stderr, "erresc: unknown set/reset mode %d\n", *args); break; } } } } void csihandle(void) { char buf[40]; int len; switch (csiescseq.mode[0]) { default: unknown: fprintf(stderr, "erresc: unknown csi "); csidump(); /* die(""); */ break; case '@': /* ICH -- Insert blank char */ DEFAULT(csiescseq.arg[0], 1); tinsertblank(csiescseq.arg[0]); break; case 'A': /* CUU -- Cursor Up */ DEFAULT(csiescseq.arg[0], 1); tmoveto(term.c.x, term.c.y-csiescseq.arg[0]); break; case 'B': /* CUD -- Cursor Down */ case 'e': /* VPR --Cursor Down */ DEFAULT(csiescseq.arg[0], 1); tmoveto(term.c.x, term.c.y+csiescseq.arg[0]); break; case 'i': /* MC -- Media Copy */ switch (csiescseq.arg[0]) { case 0: tdump(); break; case 1: tdumpline(term.c.y); break; case 2: tdumpsel(); break; case 4: term.mode &= ~MODE_PRINT; break; case 5: term.mode |= MODE_PRINT; break; } break; case 'c': /* DA -- Device Attributes */ if (csiescseq.arg[0] == 0) ttywrite(vtiden, strlen(vtiden), 0); break; case 'b': /* REP -- if last char is printable print it more times */ DEFAULT(csiescseq.arg[0], 1); if (term.lastc) while (csiescseq.arg[0]-- > 0) tputc(term.lastc); break; case 'C': /* CUF -- Cursor Forward */ case 'a': /* HPR -- Cursor Forward */ DEFAULT(csiescseq.arg[0], 1); tmoveto(term.c.x+csiescseq.arg[0], term.c.y); break; case 'D': /* CUB -- Cursor Backward */ DEFAULT(csiescseq.arg[0], 1); tmoveto(term.c.x-csiescseq.arg[0], term.c.y); break; case 'E': /* CNL -- Cursor Down and first col */ DEFAULT(csiescseq.arg[0], 1); tmoveto(0, term.c.y+csiescseq.arg[0]); break; case 'F': /* CPL -- Cursor Up and first col */ DEFAULT(csiescseq.arg[0], 1); tmoveto(0, term.c.y-csiescseq.arg[0]); break; case 'g': /* TBC -- Tabulation clear */ switch (csiescseq.arg[0]) { case 0: /* clear current tab stop */ term.tabs[term.c.x] = 0; break; case 3: /* clear all the tabs */ memset(term.tabs, 0, term.col * sizeof(*term.tabs)); break; default: goto unknown; } break; case 'G': /* CHA -- Move to */ case '`': /* HPA */ DEFAULT(csiescseq.arg[0], 1); tmoveto(csiescseq.arg[0]-1, term.c.y); break; case 'H': /* CUP -- Move to */ case 'f': /* HVP */ DEFAULT(csiescseq.arg[0], 1); DEFAULT(csiescseq.arg[1], 1); tmoveato(csiescseq.arg[1]-1, csiescseq.arg[0]-1); break; case 'I': /* CHT -- Cursor Forward Tabulation tab stops */ DEFAULT(csiescseq.arg[0], 1); tputtab(csiescseq.arg[0]); break; case 'J': /* ED -- Clear screen */ switch (csiescseq.arg[0]) { case 0: /* below */ tclearregion(term.c.x, term.c.y, term.col-1, term.c.y); if (term.c.y < term.row-1) { tclearregion(0, term.c.y+1, term.col-1, term.row-1); } break; case 1: /* above */ if (term.c.y > 1) tclearregion(0, 0, term.col-1, term.c.y-1); tclearregion(0, term.c.y, term.c.x, term.c.y); break; case 2: /* all */ tclearregion(0, 0, term.col-1, term.row-1); break; default: goto unknown; } break; case 'K': /* EL -- Clear line */ switch (csiescseq.arg[0]) { case 0: /* right */ tclearregion(term.c.x, term.c.y, term.col-1, term.c.y); break; case 1: /* left */ tclearregion(0, term.c.y, term.c.x, term.c.y); break; case 2: /* all */ tclearregion(0, term.c.y, term.col-1, term.c.y); break; } break; case 'S': /* SU -- Scroll line up */ DEFAULT(csiescseq.arg[0], 1); tscrollup(term.top, csiescseq.arg[0], 0); break; case 'T': /* SD -- Scroll line down */ DEFAULT(csiescseq.arg[0], 1); tscrolldown(term.top, csiescseq.arg[0], 0); break; case 'L': /* IL -- Insert blank lines */ DEFAULT(csiescseq.arg[0], 1); tinsertblankline(csiescseq.arg[0]); break; case 'l': /* RM -- Reset Mode */ tsetmode(csiescseq.priv, 0, csiescseq.arg, csiescseq.narg); break; case 'M': /* DL -- Delete lines */ DEFAULT(csiescseq.arg[0], 1); tdeleteline(csiescseq.arg[0]); break; case 'X': /* ECH -- Erase char */ DEFAULT(csiescseq.arg[0], 1); tclearregion(term.c.x, term.c.y, term.c.x + csiescseq.arg[0] - 1, term.c.y); break; case 'P': /* DCH -- Delete char */ DEFAULT(csiescseq.arg[0], 1); tdeletechar(csiescseq.arg[0]); break; case 'Z': /* CBT -- Cursor Backward Tabulation tab stops */ DEFAULT(csiescseq.arg[0], 1); tputtab(-csiescseq.arg[0]); break; case 'd': /* VPA -- Move to */ DEFAULT(csiescseq.arg[0], 1); tmoveato(term.c.x, csiescseq.arg[0]-1); break; case 'h': /* SM -- Set terminal mode */ tsetmode(csiescseq.priv, 1, csiescseq.arg, csiescseq.narg); break; case 'm': /* SGR -- Terminal attribute (color) */ tsetattr(csiescseq.arg, csiescseq.narg); break; case 'n': /* DSR -- Device Status Report */ switch (csiescseq.arg[0]) { case 5: /* Status Report "OK" `0n` */ ttywrite("\033[0n", sizeof("\033[0n") - 1, 0); break; case 6: /* Report Cursor Position (CPR) ";R" */ len = snprintf(buf, sizeof(buf), "\033[%i;%iR", term.c.y+1, term.c.x+1); ttywrite(buf, len, 0); break; default: goto unknown; } break; case 'r': /* DECSTBM -- Set Scrolling Region */ if (csiescseq.priv) { goto unknown; } else { DEFAULT(csiescseq.arg[0], 1); DEFAULT(csiescseq.arg[1], term.row); tsetscroll(csiescseq.arg[0]-1, csiescseq.arg[1]-1); tmoveato(0, 0); } break; case 's': /* DECSC -- Save cursor position (ANSI.SYS) */ tcursor(CURSOR_SAVE); break; case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */ tcursor(CURSOR_LOAD); break; case ' ': switch (csiescseq.mode[1]) { case 'q': /* DECSCUSR -- Set Cursor Style */ if (xsetcursor(csiescseq.arg[0])) goto unknown; break; default: goto unknown; } break; } } void csidump(void) { size_t i; uint c; fprintf(stderr, "ESC["); for (i = 0; i < csiescseq.len; i++) { c = csiescseq.buf[i] & 0xff; if (isprint(c)) { putc(c, stderr); } else if (c == '\n') { fprintf(stderr, "(\\n)"); } else if (c == '\r') { fprintf(stderr, "(\\r)"); } else if (c == 0x1b) { fprintf(stderr, "(\\e)"); } else { fprintf(stderr, "(%02x)", c); } } putc('\n', stderr); } void csireset(void) { memset(&csiescseq, 0, sizeof(csiescseq)); } void osc_color_response(int num, int index, int is_osc4) { int n; char buf[32]; unsigned char r, g, b; if (xgetcolor(is_osc4 ? num : index, &r, &g, &b)) { fprintf(stderr, "erresc: failed to fetch %s color %d\n", is_osc4 ? "osc4" : "osc", is_osc4 ? num : index); return; } n = snprintf(buf, sizeof buf, "\033]%s%d;rgb:%02x%02x/%02x%02x/%02x%02x\007", is_osc4 ? "4;" : "", num, r, r, g, g, b, b); if (n < 0 || n >= sizeof(buf)) { fprintf(stderr, "error: %s while printing %s response\n", n < 0 ? "snprintf failed" : "truncation occurred", is_osc4 ? "osc4" : "osc"); } else { ttywrite(buf, n, 1); } } void strhandle(void) { char *p = NULL, *dec; int j, narg, par; const struct { int idx; char *str; } osc_table[] = { { defaultfg, "foreground" }, { defaultbg, "background" }, { defaultcs, "cursor" } }; term.esc &= ~(ESC_STR_END|ESC_STR); strparse(); par = (narg = strescseq.narg) ? atoi(strescseq.args[0]) : 0; switch (strescseq.type) { case ']': /* OSC -- Operating System Command */ switch (par) { case 0: if (narg > 1) { xsettitle(strescseq.args[1]); xseticontitle(strescseq.args[1]); } return; case 1: if (narg > 1) xseticontitle(strescseq.args[1]); return; case 2: if (narg > 1) xsettitle(strescseq.args[1]); return; case 52: if (narg > 2 && allowwindowops) { dec = base64dec(strescseq.args[2]); if (dec) { xsetsel(dec); xclipcopy(); } else { fprintf(stderr, "erresc: invalid base64\n"); } } return; case 10: case 11: case 12: if (narg < 2) break; p = strescseq.args[1]; if ((j = par - 10) < 0 || j >= LEN(osc_table)) break; /* shouldn't be possible */ if (!strcmp(p, "?")) { osc_color_response(par, osc_table[j].idx, 0); } else if (xsetcolorname(osc_table[j].idx, p)) { fprintf(stderr, "erresc: invalid %s color: %s\n", osc_table[j].str, p); } else { tfulldirt(); } return; case 4: /* color set */ if (narg < 3) break; p = strescseq.args[2]; /* FALLTHROUGH */ case 104: /* color reset */ j = (narg > 1) ? atoi(strescseq.args[1]) : -1; if (p && !strcmp(p, "?")) { osc_color_response(j, 0, 1); } else if (xsetcolorname(j, p)) { if (par == 104 && narg <= 1) { xloadcols(); return; /* color reset without parameter */ } fprintf(stderr, "erresc: invalid color j=%d, p=%s\n", j, p ? p : "(null)"); } else { /* * TODO if defaultbg color is changed, borders * are dirty */ tfulldirt(); } return; } break; case 'k': /* old title set compatibility */ xsettitle(strescseq.args[0]); return; case 'P': /* DCS -- Device Control String */ case '_': /* APC -- Application Program Command */ case '^': /* PM -- Privacy Message */ return; } fprintf(stderr, "erresc: unknown str "); strdump(); } void strparse(void) { int c; char *p = strescseq.buf; strescseq.narg = 0; strescseq.buf[strescseq.len] = '\0'; if (*p == '\0') return; while (strescseq.narg < STR_ARG_SIZ) { strescseq.args[strescseq.narg++] = p; while ((c = *p) != ';' && c != '\0') ++p; if (c == '\0') return; *p++ = '\0'; } } void externalpipe(const Arg *arg) { int to[2]; char buf[UTF_SIZ]; void (*oldsigpipe)(int); Glyph *bp, *end; int lastpos, n, newline; if (pipe(to) == -1) return; switch (fork()) { case -1: close(to[0]); close(to[1]); return; case 0: dup2(to[0], STDIN_FILENO); close(to[0]); close(to[1]); execvp(((char **)arg->v)[0], (char **)arg->v); fprintf(stderr, "st: execvp %s\n", ((char **)arg->v)[0]); perror("failed"); exit(0); } close(to[0]); /* ignore sigpipe for now, in case child exists early */ oldsigpipe = signal(SIGPIPE, SIG_IGN); newline = 0; for (n = 0; n < term.row; n++) { bp = term.line[n]; lastpos = MIN(tlinelen(n) + 1, term.col) - 1; if (lastpos < 0) break; end = &bp[lastpos + 1]; for (; bp < end; ++bp) if (xwrite(to[1], buf, utf8encode(bp->u, buf)) < 0) break; if ((newline = term.line[n][lastpos].mode & ATTR_WRAP)) continue; if (xwrite(to[1], "\n", 1) < 0) break; newline = 0; } if (newline) (void)xwrite(to[1], "\n", 1); close(to[1]); /* restore */ signal(SIGPIPE, oldsigpipe); } void strdump(void) { size_t i; uint c; fprintf(stderr, "ESC%c", strescseq.type); for (i = 0; i < strescseq.len; i++) { c = strescseq.buf[i] & 0xff; if (c == '\0') { putc('\n', stderr); return; } else if (isprint(c)) { putc(c, stderr); } else if (c == '\n') { fprintf(stderr, "(\\n)"); } else if (c == '\r') { fprintf(stderr, "(\\r)"); } else if (c == 0x1b) { fprintf(stderr, "(\\e)"); } else { fprintf(stderr, "(%02x)", c); } } fprintf(stderr, "ESC\\\n"); } void strreset(void) { strescseq = (STREscape){ .buf = xrealloc(strescseq.buf, STR_BUF_SIZ), .siz = STR_BUF_SIZ, }; } void sendbreak(const Arg *arg) { if (tcsendbreak(cmdfd, 0)) perror("Error sending break"); } void tprinter(char *s, size_t len) { if (iofd != -1 && xwrite(iofd, s, len) < 0) { perror("Error writing to output file"); close(iofd); iofd = -1; } } void toggleprinter(const Arg *arg) { term.mode ^= MODE_PRINT; } void printscreen(const Arg *arg) { tdump(); } void printsel(const Arg *arg) { tdumpsel(); } void tdumpsel(void) { char *ptr; if ((ptr = getsel())) { tprinter(ptr, strlen(ptr)); free(ptr); } } void tdumpline(int n) { char buf[UTF_SIZ]; const Glyph *bp, *end; bp = &term.line[n][0]; end = &bp[MIN(tlinelen(n), term.col) - 1]; if (bp != end || bp->u != ' ') { for ( ; bp <= end; ++bp) tprinter(buf, utf8encode(bp->u, buf)); } tprinter("\n", 1); } void tdump(void) { int i; for (i = 0; i < term.row; ++i) tdumpline(i); } void tputtab(int n) { uint x = term.c.x; if (n > 0) { while (x < term.col && n--) for (++x; x < term.col && !term.tabs[x]; ++x) /* nothing */ ; } else if (n < 0) { while (x > 0 && n++) for (--x; x > 0 && !term.tabs[x]; --x) /* nothing */ ; } term.c.x = LIMIT(x, 0, term.col-1); } void tdefutf8(char ascii) { if (ascii == 'G') term.mode |= MODE_UTF8; else if (ascii == '@') term.mode &= ~MODE_UTF8; } void tdeftran(char ascii) { static char cs[] = "0B"; static int vcs[] = {CS_GRAPHIC0, CS_USA}; char *p; if ((p = strchr(cs, ascii)) == NULL) { fprintf(stderr, "esc unhandled charset: ESC ( %c\n", ascii); } else { term.trantbl[term.icharset] = vcs[p - cs]; } } void tdectest(char c) { int x, y; if (c == '8') { /* DEC screen alignment test. */ for (x = 0; x < term.col; ++x) { for (y = 0; y < term.row; ++y) tsetchar('E', &term.c.attr, x, y); } } } void tstrsequence(uchar c) { switch (c) { case 0x90: /* DCS -- Device Control String */ c = 'P'; break; case 0x9f: /* APC -- Application Program Command */ c = '_'; break; case 0x9e: /* PM -- Privacy Message */ c = '^'; break; case 0x9d: /* OSC -- Operating System Command */ c = ']'; break; } strreset(); strescseq.type = c; term.esc |= ESC_STR; } void tcontrolcode(uchar ascii) { switch (ascii) { case '\t': /* HT */ tputtab(1); return; case '\b': /* BS */ tmoveto(term.c.x-1, term.c.y); return; case '\r': /* CR */ tmoveto(0, term.c.y); return; case '\f': /* LF */ case '\v': /* VT */ case '\n': /* LF */ /* go to first col if the mode is set */ tnewline(IS_SET(MODE_CRLF)); return; case '\a': /* BEL */ if (term.esc & ESC_STR_END) { /* backwards compatibility to xterm */ strhandle(); } else { xbell(); } break; case '\033': /* ESC */ csireset(); term.esc &= ~(ESC_CSI|ESC_ALTCHARSET|ESC_TEST); term.esc |= ESC_START; return; case '\016': /* SO (LS1 -- Locking shift 1) */ case '\017': /* SI (LS0 -- Locking shift 0) */ term.charset = 1 - (ascii - '\016'); return; case '\032': /* SUB */ tsetchar('?', &term.c.attr, term.c.x, term.c.y); /* FALLTHROUGH */ case '\030': /* CAN */ csireset(); break; case '\005': /* ENQ (IGNORED) */ case '\000': /* NUL (IGNORED) */ case '\021': /* XON (IGNORED) */ case '\023': /* XOFF (IGNORED) */ case 0177: /* DEL (IGNORED) */ return; case 0x80: /* TODO: PAD */ case 0x81: /* TODO: HOP */ case 0x82: /* TODO: BPH */ case 0x83: /* TODO: NBH */ case 0x84: /* TODO: IND */ break; case 0x85: /* NEL -- Next line */ tnewline(1); /* always go to first col */ break; case 0x86: /* TODO: SSA */ case 0x87: /* TODO: ESA */ break; case 0x88: /* HTS -- Horizontal tab stop */ term.tabs[term.c.x] = 1; break; case 0x89: /* TODO: HTJ */ case 0x8a: /* TODO: VTS */ case 0x8b: /* TODO: PLD */ case 0x8c: /* TODO: PLU */ case 0x8d: /* TODO: RI */ case 0x8e: /* TODO: SS2 */ case 0x8f: /* TODO: SS3 */ case 0x91: /* TODO: PU1 */ case 0x92: /* TODO: PU2 */ case 0x93: /* TODO: STS */ case 0x94: /* TODO: CCH */ case 0x95: /* TODO: MW */ case 0x96: /* TODO: SPA */ case 0x97: /* TODO: EPA */ case 0x98: /* TODO: SOS */ case 0x99: /* TODO: SGCI */ break; case 0x9a: /* DECID -- Identify Terminal */ ttywrite(vtiden, strlen(vtiden), 0); break; case 0x9b: /* TODO: CSI */ case 0x9c: /* TODO: ST */ break; case 0x90: /* DCS -- Device Control String */ case 0x9d: /* OSC -- Operating System Command */ case 0x9e: /* PM -- Privacy Message */ case 0x9f: /* APC -- Application Program Command */ tstrsequence(ascii); return; } /* only CAN, SUB, \a and C1 chars interrupt a sequence */ term.esc &= ~(ESC_STR_END|ESC_STR); } /* * returns 1 when the sequence is finished and it hasn't to read * more characters for this sequence, otherwise 0 */ int eschandle(uchar ascii) { switch (ascii) { case '[': term.esc |= ESC_CSI; return 0; case '#': term.esc |= ESC_TEST; return 0; case '%': term.esc |= ESC_UTF8; return 0; case 'P': /* DCS -- Device Control String */ case '_': /* APC -- Application Program Command */ case '^': /* PM -- Privacy Message */ case ']': /* OSC -- Operating System Command */ case 'k': /* old title set compatibility */ tstrsequence(ascii); return 0; case 'n': /* LS2 -- Locking shift 2 */ case 'o': /* LS3 -- Locking shift 3 */ term.charset = 2 + (ascii - 'n'); break; case '(': /* GZD4 -- set primary charset G0 */ case ')': /* G1D4 -- set secondary charset G1 */ case '*': /* G2D4 -- set tertiary charset G2 */ case '+': /* G3D4 -- set quaternary charset G3 */ term.icharset = ascii - '('; term.esc |= ESC_ALTCHARSET; return 0; case 'D': /* IND -- Linefeed */ if (term.c.y == term.bot) { tscrollup(term.top, 1, 1); } else { tmoveto(term.c.x, term.c.y+1); } break; case 'E': /* NEL -- Next line */ tnewline(1); /* always go to first col */ break; case 'H': /* HTS -- Horizontal tab stop */ term.tabs[term.c.x] = 1; break; case 'M': /* RI -- Reverse index */ if (term.c.y == term.top) { tscrolldown(term.top, 1, 1); } else { tmoveto(term.c.x, term.c.y-1); } break; case 'Z': /* DECID -- Identify Terminal */ ttywrite(vtiden, strlen(vtiden), 0); break; case 'c': /* RIS -- Reset to initial state */ treset(); resettitle(); xloadcols(); xsetmode(0, MODE_HIDE); break; case '=': /* DECPAM -- Application keypad */ xsetmode(1, MODE_APPKEYPAD); break; case '>': /* DECPNM -- Normal keypad */ xsetmode(0, MODE_APPKEYPAD); break; case '7': /* DECSC -- Save Cursor */ tcursor(CURSOR_SAVE); break; case '8': /* DECRC -- Restore Cursor */ tcursor(CURSOR_LOAD); break; case '\\': /* ST -- String Terminator */ if (term.esc & ESC_STR_END) strhandle(); break; default: fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", (uchar) ascii, isprint(ascii)? ascii:'.'); break; } return 1; } void tputc(Rune u) { char c[UTF_SIZ]; int control; int width, len; Glyph *gp; control = ISCONTROL(u); if (u < 127 || !IS_SET(MODE_UTF8)) { c[0] = u; width = len = 1; } else { len = utf8encode(u, c); if (!control && (width = wcwidth(u)) == -1) width = 1; } if (IS_SET(MODE_PRINT)) tprinter(c, len); /* * STR sequence must be checked before anything else * because it uses all following characters until it * receives a ESC, a SUB, a ST or any other C1 control * character. */ if (term.esc & ESC_STR) { if (u == '\a' || u == 030 || u == 032 || u == 033 || ISCONTROLC1(u)) { term.esc &= ~(ESC_START|ESC_STR); term.esc |= ESC_STR_END; goto check_control_code; } if (strescseq.len+len >= strescseq.siz) { /* * Here is a bug in terminals. If the user never sends * some code to stop the str or esc command, then st * will stop responding. But this is better than * silently failing with unknown characters. At least * then users will report back. * * In the case users ever get fixed, here is the code: */ /* * term.esc = 0; * strhandle(); */ if (strescseq.siz > (SIZE_MAX - UTF_SIZ) / 2) return; strescseq.siz *= 2; strescseq.buf = xrealloc(strescseq.buf, strescseq.siz); } memmove(&strescseq.buf[strescseq.len], c, len); strescseq.len += len; return; } check_control_code: /* * Actions of control codes must be performed as soon they arrive * because they can be embedded inside a control sequence, and * they must not cause conflicts with sequences. */ if (control) { /* in UTF-8 mode ignore handling C1 control characters */ if (IS_SET(MODE_UTF8) && ISCONTROLC1(u)) return; tcontrolcode(u); /* * control codes are not shown ever */ if (!term.esc) term.lastc = 0; return; } else if (term.esc & ESC_START) { if (term.esc & ESC_CSI) { csiescseq.buf[csiescseq.len++] = u; if (BETWEEN(u, 0x40, 0x7E) || csiescseq.len >= \ sizeof(csiescseq.buf)-1) { term.esc = 0; csiparse(); csihandle(); } return; } else if (term.esc & ESC_UTF8) { tdefutf8(u); } else if (term.esc & ESC_ALTCHARSET) { tdeftran(u); } else if (term.esc & ESC_TEST) { tdectest(u); } else { if (!eschandle(u)) return; /* sequence already finished */ } term.esc = 0; /* * All characters which form part of a sequence are not * printed */ return; } if (selected(term.c.x, term.c.y)) selclear(); gp = &term.line[term.c.y][term.c.x]; if (IS_SET(MODE_WRAP) && (term.c.state & CURSOR_WRAPNEXT)) { gp->mode |= ATTR_WRAP; tnewline(1); gp = &term.line[term.c.y][term.c.x]; } if (IS_SET(MODE_INSERT) && term.c.x+width < term.col) { memmove(gp+width, gp, (term.col - term.c.x - width) * sizeof(Glyph)); gp->mode &= ~ATTR_WIDE; } if (term.c.x+width > term.col) { if (IS_SET(MODE_WRAP)) tnewline(1); else tmoveto(term.col - width, term.c.y); gp = &term.line[term.c.y][term.c.x]; } tsetchar(u, &term.c.attr, term.c.x, term.c.y); term.lastc = u; if (width == 2) { gp->mode |= ATTR_WIDE; if (term.c.x+1 < term.col) { if (gp[1].mode == ATTR_WIDE && term.c.x+2 < term.col) { gp[2].u = ' '; gp[2].mode &= ~ATTR_WDUMMY; } gp[1].u = '\0'; gp[1].mode = ATTR_WDUMMY; } } if (term.c.x+width < term.col) { tmoveto(term.c.x+width, term.c.y); } else { term.c.state |= CURSOR_WRAPNEXT; } } int twrite(const char *buf, int buflen, int show_ctrl) { int charsize; Rune u; int n; for (n = 0; n < buflen; n += charsize) { if (IS_SET(MODE_UTF8)) { /* process a complete utf8 char */ charsize = utf8decode(buf + n, &u, buflen - n); if (charsize == 0) break; } else { u = buf[n] & 0xFF; charsize = 1; } if (show_ctrl && ISCONTROL(u)) { if (u & 0x80) { u &= 0x7f; tputc('^'); tputc('['); } else if (u != '\n' && u != '\r' && u != '\t') { u ^= 0x40; tputc('^'); } } tputc(u); } return n; } void tresize(int col, int row) { int i, j; int minrow = MIN(row, term.row); int mincol = MIN(col, term.col); int *bp; TCursor c; if (col < 1 || row < 1) { fprintf(stderr, "tresize: error resizing to %dx%d\n", col, row); return; } /* * slide screen to keep cursor where we expect it - * tscrollup would work here, but we can optimize to * memmove because we're freeing the earlier lines */ for (i = 0; i <= term.c.y - row; i++) { free(term.line[i]); free(term.alt[i]); } /* ensure that both src and dst are not NULL */ if (i > 0) { memmove(term.line, term.line + i, row * sizeof(Line)); memmove(term.alt, term.alt + i, row * sizeof(Line)); } for (i += row; i < term.row; i++) { free(term.line[i]); free(term.alt[i]); } /* resize to new height */ term.line = xrealloc(term.line, row * sizeof(Line)); term.alt = xrealloc(term.alt, row * sizeof(Line)); term.dirty = xrealloc(term.dirty, row * sizeof(*term.dirty)); term.tabs = xrealloc(term.tabs, col * sizeof(*term.tabs)); for (i = 0; i < HISTSIZE; i++) { term.hist[i] = xrealloc(term.hist[i], col * sizeof(Glyph)); for (j = mincol; j < col; j++) { term.hist[i][j] = term.c.attr; term.hist[i][j].u = ' '; } } /* resize each row to new width, zero-pad if needed */ for (i = 0; i < minrow; i++) { term.line[i] = xrealloc(term.line[i], col * sizeof(Glyph)); term.alt[i] = xrealloc(term.alt[i], col * sizeof(Glyph)); } /* allocate any new rows */ for (/* i = minrow */; i < row; i++) { term.line[i] = xmalloc(col * sizeof(Glyph)); term.alt[i] = xmalloc(col * sizeof(Glyph)); } if (col > term.col) { bp = term.tabs + term.col; memset(bp, 0, sizeof(*term.tabs) * (col - term.col)); while (--bp > term.tabs && !*bp) /* nothing */ ; for (bp += tabspaces; bp < term.tabs + col; bp += tabspaces) *bp = 1; } /* update terminal size */ term.col = col; term.row = row; /* reset scrolling region */ tsetscroll(0, row-1); /* make use of the LIMIT in tmoveto */ tmoveto(term.c.x, term.c.y); /* Clearing both screens (it makes dirty all lines) */ c = term.c; for (i = 0; i < 2; i++) { if (mincol < col && 0 < minrow) { tclearregion(mincol, 0, col - 1, minrow - 1); } if (0 < col && minrow < row) { tclearregion(0, minrow, col - 1, row - 1); } tswapscreen(); tcursor(CURSOR_LOAD); } term.c = c; } void resettitle(void) { xsettitle(NULL); } void drawregion(int x1, int y1, int x2, int y2) { int y; for (y = y1; y < y2; y++) { if (!term.dirty[y]) continue; term.dirty[y] = 0; xdrawline(TLINE(y), x1, y, x2); } } void draw(void) { int cx = term.c.x, ocx = term.ocx, ocy = term.ocy; if (!xstartdraw()) return; /* adjust cursor position */ LIMIT(term.ocx, 0, term.col-1); LIMIT(term.ocy, 0, term.row-1); if (term.line[term.ocy][term.ocx].mode & ATTR_WDUMMY) term.ocx--; if (term.line[term.c.y][cx].mode & ATTR_WDUMMY) cx--; drawregion(0, 0, term.col, term.row); if (term.scr == 0) xdrawcursor(cx, term.c.y, term.line[term.c.y][cx], term.ocx, term.ocy, term.line[term.ocy][term.ocx]); term.ocx = cx; term.ocy = term.c.y; xfinishdraw(); if (ocx != term.ocx || ocy != term.ocy) xximspot(term.ocx, term.ocy); } void redraw(void) { tfulldirt(); draw(); }