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drop stdio usage

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Std requires I/O multiplexing which is very complicated with
stdio, because it provides no transparent buffering.
This commit is contained in:
Matthias-Christian Ott 2008-06-14 23:12:07 +02:00
parent 0c0ada8a7f
commit a49919a10c
1 changed files with 31 additions and 9 deletions
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40
std.c
View file

@ -16,6 +16,7 @@
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 @@ typedef struct {
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) {
@ -61,6 +68,17 @@ cmd(const char *cmdstr, ...) {
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
movea(int x, int y) {
x = MAX(x, cols);
@ -81,10 +99,10 @@ parseesc(void) {
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 @@ parseesc(void) {
}
break;
}
c = getc(fptm);
c = getch();
}
switch(c) {
case '@':
@ -180,7 +198,7 @@ parseesc(void) {
break;
default:
putchar('\033');
ungetc(c, fptm);
ungetch(c);
}
}
@ -236,6 +254,13 @@ unbuffer(void) {
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 @@ main(int argc, char *argv[]) {
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();