rename libc to libjehanne; improve libposix

This is to avoid conflicts between standards' assumptions and Jehanne's choices

sys/src/lib/jehanne/port/encodefmt.c

@@ -0,0 +1,89 @@
+/*
+ * This file is part of the UCB release of Plan 9. It is subject to the license
+ * terms in the LICENSE file found in the top-level directory of this
+ * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No
+ * part of the UCB release of Plan 9, including this file, may be copied,
+ * modified, propagated, or distributed except according to the terms contained
+ * in the LICENSE file.
+ */
+
+#include <u.h>
+#include <libc.h>
+#include <ctype.h>
+
+int
+jehanne_encodefmt(Fmt *f)
+{
+	char *out;
+	char *buf;
+	int len;
+	int ilen;
+	int rv;
+	uint8_t *b;
+	char *p;
+	char obuf[64];	// rsc optimization
+
+	out = nil;
+	if(!(f->flags&FmtPrec) || f->prec < 1)
+		goto error;
+
+	b = va_arg(f->args, uint8_t*);
+	if(b == 0)
+		return jehanne_fmtstrcpy(f, "<nil>");
+
+	ilen = f->prec;
+	f->prec = 0;
+	f->flags &= ~FmtPrec;
+	switch(f->r){
+	case '<':
+		len = (8*ilen+4)/5 + 3;
+		break;
+	case '[':
+		len = (8*ilen+5)/6 + 4;
+		break;
+	case 'H':
+		len = 2*ilen + 1;
+		break;
+	default:
+		goto error;
+	}
+
+	if(len > sizeof(obuf)){
+		buf = jehanne_malloc(len);
+		if(buf == nil)
+			goto error;
+	} else
+		buf = obuf;
+
+	// convert
+	out = buf;
+	switch(f->r){
+	case '<':
+		rv = jehanne_enc32(out, len, b, ilen);
+		break;
+	case '[':
+		rv = jehanne_enc64(out, len, b, ilen);
+		break;
+	case 'H':
+		rv = jehanne_enc16(out, len, b, ilen);
+		if(rv >= 0 && (f->flags & FmtLong))
+			for(p = buf; *p; p++)
+				*p = jehanne_tolower(*p);
+		break;
+	default:
+		rv = -1;
+		break;
+	}
+	if(rv < 0)
+		goto error;
+
+	jehanne_fmtstrcpy(f, buf);
+	if(buf != obuf)
+		jehanne_free(buf);
+	return 0;
+
+error:
+	if(out != nil)
+		jehanne_free(out);
+	return jehanne_fmtstrcpy(f, "<encodefmt>");
+}