size_t cdecl__advance(struct output_state *dst, size_t amount);
size_t cdecl__emit(struct output_state *dst, const char *src);
+size_t cdecl__emit_uint(struct output_state *dst, uintmax_t val);
size_t cdecl__strlcpy(char *dst, const char *src, size_t len);
const char *cdecl__emit_specs(struct output_state *dst,
const char *s = a->vla[0] ? a->vla : "*";
cdecl__emit(dst, s);
} else {
- size_t rc = snprintf(dst->dst, dst->dstlen, "%.0" PRIuMAX, a->length);
- cdecl__advance(dst, rc);
+ cdecl__emit_uint(dst, a->length);
}
cdecl__emit(dst, "]");
if (a->vla) {
rc = cdecl__emit(dst, a->vla);
} else {
- rc = snprintf(dst->dst, dst->dstlen, "%.0" PRIuMAX, a->length);
- cdecl__advance(dst, rc);
+ rc = cdecl__emit_uint(dst, a->length);
}
cdecl__emit(dst, " of " + !rc);
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)
+{
+ 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 rc;