X-Git-Url: https://git.danieliu.xyz/?a=blobdiff_plain;f=std.c;h=84a4b49c503eabcbe901f049ec0865a3f74f3751;hb=07d1edcd76cf8ec3f6e72e79bbc1481da77e30f7;hp=3e155e6a8c51dce352a8d5e513d5c34146305f06;hpb=7a132bd6ac40bfa32b6ac1da412c8c7d35e2d5ca;p=st.git diff --git a/std.c b/std.c index 3e155e6..84a4b49 100644 --- a/std.c +++ b/std.c @@ -1,8 +1,24 @@ -/* See LICENSE file for copyright and license details. */ +/* See LICENSE file for copyright and license details. + * + * Simple terminal daemon is a terminal emulator. It can be used in + * combination with simple terminal to emulate a mostly VT100-compatible + * terminal. + * + * In this process std works like a filter. It reads data from a + * pseudo-terminal and parses the escape sequences and transforms + * them into an ed(1)-like. The resulting data is buffered and written + * to stdout. + * Parallely it reads data from stdin and parses and executes the + * commands. The resulting data is written to the pseudo-terminal. + */ #include #include #include #include +#include +#if !(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600) +#include +#endif #include #include #include @@ -14,19 +30,6 @@ #define MAX(a,b) (((a) > (b)) ? (a) : (b)) #define MIN(a,b) (((a) < (b)) ? (a) : (b)) -static void buffer(char c); -static void cmd(const char *cmdstr, ...); -static int getch(); -void getpty(void); -static void movea(int x, int y); -static void mover(int x, int y); -static void parseesc(void); -static void scroll(int l); -static void shell(void); -static void sigchld(int n); -static char unbuffer(void); -static void ungetch(int c); - typedef struct { unsigned char data[BUFSIZ]; int s, e; @@ -36,16 +39,31 @@ typedef struct { typedef struct { unsigned char data[BUFSIZ]; int i, n; + int fd; } ReadBuffer; +static void buffer(char c); +static void cmd(const char *cmdstr, ...); +static int getch(ReadBuffer *buf); +static void getpty(void); +static void movea(int x, int y); +static void mover(int x, int y); +static void parsecmd(void); +static void parseesc(void); +static void scroll(int l); +static void shell(void); +static void sigchld(int n); +static char unbuffer(void); +static void ungetch(ReadBuffer *buf, int c); + static int cols = 80, lines = 25; static int cx = 0, cy = 0; static int c; -int ptm, pts; +static int ptm, pts; static _Bool bold, digit, qmark; static pid_t pid; static RingBuffer buf; -static ReadBuffer rbuf; +static ReadBuffer cmdbuf, ptmbuf; void buffer(char c) { @@ -69,14 +87,14 @@ cmd(const char *cmdstr, ...) { } int -getch() { - if(rbuf.i++ >= rbuf.n) { - rbuf.n = read(ptm, rbuf.data, LENGTH(rbuf.data)); - if(rbuf.n == -1) - err(EXIT_FAILURE, "cannot read from slave pty"); - rbuf.i = 0; +getch(ReadBuffer *buf) { + if(buf->i++ >= buf->n) { + buf->n = read(buf->fd, buf->data, BUFSIZ); + if(buf->n == -1) + err(EXIT_FAILURE, "cannot read"); + buf->i = 0; } - return rbuf.data[rbuf.i]; + return buf->data[buf->i]; } void @@ -93,16 +111,20 @@ mover(int x, int y) { movea(cx + x, cy + y); } +void +parsecmd(void) { +} + void parseesc(void) { int i, j; int arg[16]; memset(arg, 0, LENGTH(arg)); - c = getch(); + c = getch(&ptmbuf); switch(c) { case '[': - c = getch(); + c = getch(&ptmbuf); for(j = 0; j < LENGTH(arg);) { if(isdigit(c)) { digit = 1; @@ -124,7 +146,7 @@ parseesc(void) { } break; } - c = getch(); + c = getch(&ptmbuf); } switch(c) { case '@': @@ -198,7 +220,7 @@ parseesc(void) { break; default: putchar('\033'); - ungetch(c); + ungetch(&ptmbuf, c); } } @@ -207,6 +229,38 @@ scroll(int l) { cmd("seek(%d,%d)", cx, cy + l); } +void +getpty(void) { + char *ptsdev; + +#if defined(_GNU_SOURCE) + ptm = getpt(); +#elif _POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600 + ptm = posix_openpt(O_RDWR); +#else + ptm = open("/dev/ptmx", O_RDWR); + if(ptm == -1) + if(openpty(&ptm, &pts, NULL, NULL, NULL) == -1) + err(EXIT_FAILURE, "cannot open pty"); +#endif +#if defined(_XOPEN_SOURCE) + if(ptm != -1) { + if(grantpt(ptm) == -1) + err(EXIT_FAILURE, "cannot grant access to pty"); + if(unlockpt(ptm) == -1) + err(EXIT_FAILURE, "cannot unlock pty"); + ptsdev = ptsname(ptm); + if(!ptsdev) + err(EXIT_FAILURE, "slave pty name undefined"); + pts = open(ptsdev, O_RDWR); + if(pts == -1) + err(EXIT_FAILURE, "cannot open slave pty"); + } + else + err(EXIT_FAILURE, "cannot open pty"); +#endif +} + void shell(void) { static char *shell = NULL; @@ -255,35 +309,44 @@ unbuffer(void) { } void -ungetch(int c) { - if(rbuf.i + 1 >= rbuf.n) - errx(EXIT_FAILURE, "read buffer full"); - rbuf.data[rbuf.i++] = c; +ungetch(ReadBuffer *buf, int c) { + if(buf->i + 1 >= buf->n) + errx(EXIT_FAILURE, "buffer full"); + buf->data[buf->i++] = c; } int main(int argc, char *argv[]) { fd_set rfds; - if(argc == 2 && !strcmp("-v", argv[1])) { - fprintf(stderr, "std-"VERSION", © 2008 Matthias-Christian Ott\n"); - exit(EXIT_SUCCESS); - } - else if(argc == 1) { - fprintf(stderr, "usage: st [-v]\n"); - exit(EXIT_FAILURE); - } + if(argc == 2 && !strcmp("-v", argv[1])) + errx(EXIT_SUCCESS, "std-"VERSION", © 2008 Matthias-Christian Ott"); + else if(argc == 1) + errx(EXIT_FAILURE, "usage: std [-v]"); getpty(); shell(); + cmdbuf.fd = STDIN_FILENO; + ptmbuf.fd = ptm; FD_ZERO(&rfds); FD_SET(STDIN_FILENO, &rfds); FD_SET(ptm, &rfds); for(;;) { if(select(ptm + 1, &rfds, NULL, NULL, NULL) == -1) err(EXIT_FAILURE, "cannot select"); + if(FD_ISSET(STDIN_FILENO, &rfds)) + do { + c = getch(&cmdbuf); + switch(c) { + case ':': + parsecmd(); + break; + default: + break; + } + } while(cmdbuf.i < cmdbuf.n); if(FD_ISSET(ptm, &rfds)) { do { - c = getch(); + c = getch(&ptmbuf); switch(c) { case '\033': parseesc(); @@ -291,7 +354,7 @@ main(int argc, char *argv[]) { default: putchar(c); } - } while(rbuf.i < rbuf.n); + } while(ptmbuf.i < ptmbuf.n); fflush(stdout); } }