1 files changed, 134 insertions, 0 deletions
diff --git a/src/cmd/tcs/conv_gb.c b/src/cmd/tcs/conv_gb.c
new file mode 100644
index 00000000..70835257
--- /dev/null
+++ b/src/cmd/tcs/conv_gb.c
@@ -0,0 +1,134 @@
+#ifdef	PLAN9
+#include	<u.h>
+#include	<libc.h>
+#include	<bio.h>
+#else
+#include	<stdio.h>
+#include	<unistd.h>
+#include	"plan9.h"
+#endif
+#include	"hdr.h"
+#include	"conv.h"
+#include	"gb.h"
+
+/*
+	a state machine for interpreting gb.
+*/
+void
+gbproc(int c, Rune **r, long input_loc)
+{
+	static enum { state0, state1 } state = state0;
+	static int lastc;
+	long n, ch, cold = c;
+
+	switch(state)
+	{
+	case state0:	/* idle state */
+		if(c < 0)
+			return;
+		if(c >= 0xA1){
+			lastc = c;
+			state = state1;
+			return;
+		}
+		emit(c);
+		return;
+
+	case state1:	/* seen a font spec */
+		if(c >= 0xA1)
+			n = (lastc-0xA0)*100 + (c-0xA0);
+		else {
+			nerrors++;
+			if(squawk)
+				EPR "%s: bad gb glyph %d (from 0x%x,0x%lx) near byte %ld in %s\n", argv0, c-0xA0, lastc, cold, input_loc, file);
+			if(!clean)
+				emit(BADMAP);
+			state = state0;
+			return;
+		}
+		ch = tabgb[n];
+		if(ch < 0){
+			nerrors++;
+			if(squawk)
+				EPR "%s: unknown gb %ld (from 0x%x,0x%lx) near byte %ld in %s\n", argv0, n, lastc, cold, input_loc, file);
+			if(!clean)
+				emit(BADMAP);
+		} else
+			emit(ch);
+		state = state0;
+	}
+}
+
+void
+gb_in(int fd, long *notused, struct convert *out)
+{
+	Rune ob[N];
+	Rune *r, *re;
+	uchar ibuf[N];
+	int n, i;
+	long nin;
+
+	USED(notused);
+	r = ob;
+	re = ob+N-3;
+	nin = 0;
+	while((n = read(fd, ibuf, sizeof ibuf)) > 0){
+		for(i = 0; i < n; i++){
+			gbproc(ibuf[i], &r, nin++);
+			if(r >= re){
+				OUT(out, ob, r-ob);
+				r = ob;
+			}
+		}
+		if(r > ob){
+			OUT(out, ob, r-ob);
+			r = ob;
+		}
+	}
+	gbproc(-1, &r, nin);
+	if(r > ob)
+		OUT(out, ob, r-ob);
+}
+
+void
+gb_out(Rune *base, int n, long *notused)
+{
+	char *p;
+	int i;
+	Rune r;
+	static int first = 1;
+
+	USED(notused);
+	if(first){
+		first = 0;
+		for(i = 0; i < NRUNE; i++)
+			tab[i] = -1;
+		for(i = 0; i < GBMAX; i++)
+			if(tabgb[i] != -1)
+				tab[tabgb[i]] = i;
+	}
+	nrunes += n;
+	p = obuf;
+	for(i = 0; i < n; i++){
+		r = base[i];
+		if(r < 128)
+			*p++ = r;
+		else {
+			if(tab[r] != -1){
+				r = tab[r];
+				*p++ = 0xA0 + (r/100);
+				*p++ = 0xA0 + (r%100);
+				continue;
+			}
+			if(squawk)
+				EPR "%s: rune 0x%x not in output cs\n", argv0, r);
+			nerrors++;
+			if(clean)
+				continue;
+			*p++ = BYTEBADMAP;
+		}
+	}
+	noutput += p-obuf;
+	if(p > obuf)
+		write(1, obuf, p-obuf);
+}