Document that dr_sscanf supports character sets (#7656)
Our internal sscanf implementation does support character sets, but the
dr_sscanf docs did not include that information before.
diff --git a/core/io.c b/core/io.c
index 9bf9fbf..5c2eacb 100644
--- a/core/io.c
+++ b/core/io.c
@@ -574,7 +574,6 @@
break;
/* XXX: Modifiers we could add support for:
* - j, z, t: C99 modifiers for intmax_t, size_t, and ptrdiff_t.
- * - [] scan sets: These are complicated and better to avoid.
* - .*: For dynamically sized strings. Not part of C scanf.
* - n$: Store the result into the nth pointer arg after fmt.
*/
diff --git a/core/lib/dr_tools.h b/core/lib/dr_tools.h
index a6c66eb..89814d5 100644
--- a/core/lib/dr_tools.h
+++ b/core/lib/dr_tools.h
@@ -1906,6 +1906,12 @@
* - \%x: Matches an unsigned hexadecimal integer, with or without a leading 0x.
* - \%p: Matches a pointer-sized hexadecimal integer as %x does.
* - \%%: Matches a literal % character. Does not store output.
+ * - \%[..]: Matches characters in the set within the brackets, or all other
+ * characters if the first character after the open bracket is ^.
+ * To include a close bracket in the set, make it the first set character.
+ * A range of characters can be specified with a hyphen.
+ * The result is copied into the provided output string buffer.
+ * To avoid buffer overflow, the caller should use a width specifier.
*
* Supported format modifiers:
* - *: The * modifier causes the scan to match the specifier, but not store any
