X-Git-Url: https://git.draconx.ca/gitweb/cdecl99.git/blobdiff_plain/54ca2ed1ca173c7818792b6b06d12b8536acb6f3..5fc35dc076078b9710d86b47c53f4315edd3cd82:/src/output.c

diff --git a/src/output.c b/src/output.c
index 8c2cd0b..c0438e6 100644
--- a/src/output.c
+++ b/src/output.c
@@ -1,27 +1,126 @@
+/*
+ *  Helper functions for outputting text.
+ *  Copyright © 2011, 2021, 2023 Nick Bowler
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <config.h>
 #include <stdio.h>
-#include "output.h"
+#include <assert.h>
 
-size_t cdecl__advance_(char **buf, size_t *n, size_t amount)
+#include "cdecl.h"
+#include "cdecl-internal.h"
+
+#include "parse.h"
+#include "specstr.h"
+
+size_t cdecl__advance(struct output_state *dst, size_t amount)
 {
-	if (amount >= *n) {
-		*n   = 0;
-		*buf = 0;
-	} else {
-		*buf += amount;
-		*n   -= amount;
-	}
+	size_t x = MIN(amount, dst->dstlen);
+
+	dst->dst    += x;
+	dst->dstlen -= x;
+	dst->accum  += amount;
 
 	return amount;
 }
 
-size_t cdecl__advance(char **buf, size_t *n, size_t amount)
+size_t cdecl__strlcpy(char *dst, const char *src, size_t dstlen)
+{
+	size_t srclen = strlen(src);
+
+	if (dstlen > 0) {
+		memcpy(dst, src, MIN(dstlen, srclen+1));
+		if (dstlen <= srclen)
+			dst[dstlen-1] = 0;
+	}
+
+	return srclen;
+}
+
+size_t cdecl__emit(struct output_state *dst, const char *src)
+{
+	size_t rc = cdecl__strlcpy(dst->dst, src, dst->dstlen);
+	return cdecl__advance(dst, rc);
+}
+
+/*
+ * 31 decimal digits is enough for values up to 2^102 - 1.
+ * 63 decimal digits is enough for values up to 2^209 - 1.
+ *
+ * We can't portably write numbers this large in preprocessor conditionals,
+ * but since the maximum values of unsigned integer types are always one
+ * less than a power of two, we can use a sequence of small shifts to infer
+ * the bounds.
+ *
+ * All known implementations have 64-bit uintmax_t.  Leave some headroom
+ * to support a possible future implementatons with 128-bit uintmax_t.
+ */
+enum {
+#if (UINTMAX_MAX >> 27 >> 27 >> 26 >> 26) == 0
+	MAX_UINT_DIGITS = 31
+#elif (UINTMAX_MAX >> 27 >> 26 >> 26 >> 26 >> 26 >> 26 >> 26 >> 26) == 0
+	MAX_UINT_DIGITS = 63
+#else
+#	error UINTMAX_MAX is too large, please report a bug.
+#endif
+};
+
+size_t cdecl__emit_uint(struct output_state *dst, uintmax_t val)
 {
-	size_t ret, rc;
+	char buf[MAX_UINT_DIGITS + 1], *p = &buf[sizeof buf];
 
-	if (!amount)
-		return 0;
+	*(--p) = 0;
+	while (val > 0) {
+		*(--p) = '0' + val % 10;
+		val /= 10;
+	}
+
+	return cdecl__emit(dst, p);
+}
+
+static void explain_spec(struct output_state *dst, struct cdecl_declspec *s)
+{
+	size_t rc;
+
+	rc = cdecl__emit(dst, spec_string(s->type));
+	if (s->ident) {
+		cdecl__emit(dst, " " + !rc);
+		cdecl__emit(dst, s->ident);
+	}
+}
+
+/*
+ * Render a list of declaration specifiers.  Only the declaration specifiers
+ * listed in mask, which is the bitwise OR of the desired specifier kinds, are
+ * printed.
+ */
+const char *cdecl__emit_specs(struct output_state *dst,
+                              struct cdecl_declspec *s,
+                              unsigned mask)
+{
+	const char *sep = " ";
+	int empty = 1;
+
+	for (; s; s = s->next) {
+		if (!(s->type & mask))
+			continue;
+
+		cdecl__emit(dst, sep + empty);
+		explain_spec(dst, s);
+		empty = 0;
+	}
 
-	ret = cdecl__advance_(buf, n, amount);
-	rc = snprintf(*buf, *n, " ");
-	return ret + cdecl__advance_(buf, n, rc);
+	return sep + empty;
 }