X-Git-Url: https://git.draconx.ca/gitweb/cdecl99.git/blobdiff_plain/0b2a2978f09f5d9b56d8655dd60eaffbe9006b7a..7f52c6d4be39c4d5ece844011de3581fe718b199:/src/output.c

diff --git a/src/output.c b/src/output.c
index 27921ab..c0438e6 100644
--- a/src/output.c
+++ b/src/output.c
@@ -22,38 +22,83 @@
 #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 >= dst->dstlen) {
-		dst->dstlen = 0;
-		dst->dst    = 0;
-	} else {
-		dst->dst    += amount;
-		dst->dstlen -= amount;
-	}
+	size_t x = MIN(amount, dst->dstlen);
+
+	dst->dst    += x;
+	dst->dstlen -= x;
+	dst->accum  += amount;
 
 	return 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 = snprintf(dst->dst, dst->dstlen, "%s", src);
+	size_t rc = cdecl__strlcpy(dst->dst, src, dst->dstlen);
 	return cdecl__advance(dst, rc);
 }
 
-static size_t explain_spec(struct output_state *dst, struct cdecl_declspec *s)
+/*
+ * 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)
+{
+	char buf[MAX_UINT_DIGITS + 1], *p = &buf[sizeof buf];
+
+	*(--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 ret;
+	size_t rc;
 
-	ret = cdecl__emit(dst, spec_string(s->type));
+	rc = cdecl__emit(dst, spec_string(s->type));
 	if (s->ident) {
-		ret += cdecl__emit(dst, " " + !ret);
-		ret += cdecl__emit(dst, s->ident);
+		cdecl__emit(dst, " " + !rc);
+		cdecl__emit(dst, s->ident);
 	}
-
-	return ret;
 }
 
 /*
@@ -61,19 +106,21 @@ static size_t explain_spec(struct output_state *dst, struct cdecl_declspec *s)
  * listed in mask, which is the bitwise OR of the desired specifier kinds, are
  * printed.
  */
-size_t cdecl__emit_specs(struct output_state *dst,
-                         struct cdecl_declspec *s,
-                         unsigned mask)
+const char *cdecl__emit_specs(struct output_state *dst,
+                              struct cdecl_declspec *s,
+                              unsigned mask)
 {
-	size_t ret = 0;
+	const char *sep = " ";
+	int empty = 1;
 
 	for (; s; s = s->next) {
 		if (!(s->type & mask))
 			continue;
 
-		ret += cdecl__emit(dst, " " + !ret);
-		ret += explain_spec(dst, s);
+		cdecl__emit(dst, sep + empty);
+		explain_spec(dst, s);
+		empty = 0;
 	}
 
-	return ret;
+	return sep + empty;
 }