drop stdio usage Std requires I/O multiplexing which is very complicated with stdio, because it provides no transparent buffering.
Matthias-Christian Ott ott@enolink.de
1 files changed,
31 insertions(+),
9 deletions(-)
jump to
M
std.c
→
std.c
@@ -16,6 +16,7 @@ #define MIN(a,b) (((a) < (b)) ? (a) : (b))
void buffer(char c); void cmd(const char *cmdstr, ...); +int getch(); void getpty(void); void movea(int x, int y); void mover(int x, int y);@@ -24,6 +25,7 @@ void scroll(int l);
void shell(void); void sigchld(int n); char unbuffer(void); +void ungetch(int c); typedef struct { unsigned char data[BUFSIZ];@@ -31,14 +33,19 @@ int s, e;
int n; } RingBuffer; +typedef struct { + unsigned char data[BUFSIZ]; + int i, n; +} ReadBuffer; + int cols = 80, lines = 25; int cx = 0, cy = 0; int c; -FILE *fptm = NULL; int ptm, pts; _Bool bold, digit, qmark; pid_t pid; RingBuffer buf; +ReadBuffer rbuf; void buffer(char c) {@@ -59,6 +66,17 @@ putchar(':');
va_start(ap, cmdstr); vfprintf(stdout, cmdstr, ap); va_end(ap); +} + +int +getch() { + if(rbuf.i++ >= rbuf.n) { + rbuf.n = read(ptm, rbuf.data, LENGTH(rbuf.data)); + if(rbuf.n == -1) + eprintn("error, cannot read from slave pty"); + rbuf.i = 0; + } + return rbuf.data[rbuf.i]; } void@@ -81,10 +99,10 @@ int i, j;
int arg[16]; memset(arg, 0, LENGTH(arg)); - c = getc(fptm); + c = getch(); switch(c) { case '[': - c = getc(fptm); + c = getch(); for(j = 0; j < LENGTH(arg);) { if(isdigit(c)) { digit = 1;@@ -106,7 +124,7 @@ j++;
} break; } - c = getc(fptm); + c = getch(); } switch(c) { case '@':@@ -180,7 +198,7 @@ }
break; default: putchar('\033'); - ungetc(c, fptm); + ungetch(c); } }@@ -236,6 +254,13 @@ buf.n--;
return c; } +void +ungetch(int c) { + if(rbuf.i + 1 >= rbuf.n) + eprint("error, read buffer full\n"); + rbuf.data[rbuf.i++] = c; +} + int main(int argc, char *argv[]) { if(argc == 2 && !strcmp("-v", argv[1]))@@ -244,11 +269,8 @@ else if(argc == 1)
eprint("usage: st [-v]\n"); getpty(); shell(); - fptm = fdopen(ptm, "r+"); - if(!fptm) - eprintn("cannot open slave pty"); for(;;) { - c = getc(fptm); + c = getch(); switch(c) { case '\033': parseesc();